US20100328098A1 - System and method for integrated antenna in a sensing module for measurement of the muscular-skeletal system - Google Patents
System and method for integrated antenna in a sensing module for measurement of the muscular-skeletal system Download PDFInfo
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- US20100328098A1 US20100328098A1 US12/825,646 US82564610A US2010328098A1 US 20100328098 A1 US20100328098 A1 US 20100328098A1 US 82564610 A US82564610 A US 82564610A US 2010328098 A1 US2010328098 A1 US 2010328098A1
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
- A61B5/6867—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive specially adapted to be attached or implanted in a specific body part
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/45—For evaluating or diagnosing the musculoskeletal system or teeth
- A61B5/4528—Joints
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/45—For evaluating or diagnosing the musculoskeletal system or teeth
- A61B5/4504—Bones
- A61B5/4509—Bone density determination
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- A—HUMAN NECESSITIES
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Abstract
A sensing insert device (100) is disclosed for measuring a parameter of the muscular-skeletal system. The sensing insert device (100) can be temporary or permanent. Used intra-operatively, the sensing insert device (100) comprises an insert dock (202) and a sensing module (200). The sensing module (200) is a self-contained encapsulated measurement device having at least one contacting surface that couples to the muscular-skeletal system. The sensing module (200) comprises one or more sensing assemblages (1802), electronic circuitry (307), an antenna (2302), and communication circuitry (320). The at least one circuit board (1612 and 1616) includes the antenna (2302). The antenna (2302) is formed as one or more loops around a periphery of the circuit board. The antenna (2302) allows short-range transmission of the measured parameter data to a receiver placed in proximity to the muscular-skeletal system. Alternatively, the antenna can be formed in the insert dock (202).
Description
- This application claims the priority benefit of U.S. provisional patent application Nos. 61/221,761, 61/221,767, 61/221,779, 61/221,788, 61/221,793, 61/221,801, 61/221,808, 61/221,817, 61/221,867, 61/221,874, 61/221,879, 61/221,881, 61/221,886, 61/221,889, 61/221,894, 61/221,901, 61/221,909, 61/221,916, 61/221,923, and 61/221,929 all filed 30 Jun. 2009; the disclosures of which are hereby incorporated herein by reference in their entirety.
- The present invention pertains generally to medical device electronics, and particularly to, but not exclusively to, integration of an antenna within electronic circuits for efficiently communicating sensor data.
- The skeletal system of a mammal is subject to variations among species. Further changes can occur due to environmental factors, degradation through use, and aging. An orthopedic joint of the skeletal system typically comprises two or more bones that move in relation to one another. Movement is enabled by muscle tissue and tendons attached to the skeletal system of the joint. Ligaments hold and stabilize the one or more joint bones positionally. Cartilage is a wear surface that prevents bone-to-bone contact, distributes load, and lowers friction.
- There has been substantial growth in the repair of the human skeletal system. In general, orthopedic joints have evolved using information from simulations, mechanical prototypes, and patient data that is collected and used to initiate improved designs. Similarly, the tools being used for orthopedic surgery have been refined over the years but have not changed substantially. Thus, the basic procedure for replacement of an orthopedic joint has been standardized to meet the general needs of a wide distribution of the population. Although the tools, procedure, and artificial joint meet a general need, each replacement procedure is subject to significant variation from patient to patient. The correction of these individual variations relies on the skill of the surgeon to adapt and fit the replacement joint using the available tools to the specific circumstance.
- Various features of the system are set forth with particularity in the appended claims. The embodiments herein, can be understood by reference to the following description, taken in conjunction with the accompanying drawings, in which:
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FIG. 1 is an illustration of an application of sensing insert device in accordance with an exemplary embodiment; -
FIG. 2 is an illustration of a sensing insert device placed in a joint of the muscular-skeletal system for measuring a parameter in accordance with an exemplary embodiment; -
FIG. 3 is a perspective view of a medical sensing platform comprising an encapsulating enclosure in accordance with one embodiment; -
FIG. 4 is a perspective view of a medical sensing device suitable for use as a bi-compartmental implant and comprising an encapsulating enclosure in accordance with one embodiment; -
FIG. 5 is an exemplary block diagram of the components of the sensing module in accordance with an exemplary embodiment; -
FIG. 6 is a diagram of an exemplary communications system for short-range telemetry according to one embodiment; -
FIG. 7 is an illustration of a block model diagram of the sensing module in accordance with an exemplary embodiment; -
FIG. 8 is an exemplary assemblage that illustrates propagation of ultrasound waves within the waveguide in the bi-directional mode of operation of this assemblage in accordance with one embodiment; -
FIG. 9 is an exemplary cross-sectional view of an ultrasound waveguide to illustrate changes in the propagation of ultrasound waves with changes in the length of the waveguide in accordance with one embodiment; -
FIG. 10 is an exemplary block diagram of a propagation tuned oscillator (PTO) to maintain positive closed-loop feedback in accordance with an exemplary embodiment; -
FIG. 11 is a cross-sectional view of a layout architecture of the sensing module in accordance with an exemplary embodiment; -
FIG. 12 is a simplified cross-sectional view of an embodiment of the load sensing platform in accordance with an exemplary embodiment; -
FIG. 13 is an illustration of an exemplary data packet containing sensor data; -
FIG. 14 is an exemplary block diagram schematic of a compact low-power energy source integrated into an exemplary electronic assembly of the sensing module in accordance with one embodiment; -
FIG. 15 is a partial cross-section schematic side view of a sensing platform including multiple constructed levels comprising electronic substrates with electronic components mounted thereon in accordance with an exemplary embodiment; -
FIG. 16 is a partial cross-section schematic side view of the sensing platform including multiple constructed levels comprising electronic substrates with electronic components mounted thereon in accordance with an exemplary embodiment; -
FIG. 17 is a partial cross-section schematic side view of a sensing module including multiple constructed levels comprising electronic substrates with electronic components mounted thereon in accordance with an exemplary embodiment; -
FIG. 18 is a cross-sectional view of the sensing module having a small form factor in accordance with an exemplary embodiment; -
FIG. 19 is a perspective view of the interconnect stack of the sensing module in accordance with an exemplary embodiment; -
FIG. 20 is a partial cross-section schematic side view of a sensing platform including multiple constructed levels comprising electronic substrates with electronic components mounted thereon in accordance with an exemplary embodiment; -
FIG. 21 is a partial cross-section schematic side view of the sensing platform including multiple constructed levels comprising electronic substrates with electronic components mounted thereon in accordance with an exemplary embodiment; -
FIG. 22 is a partial cross-section schematic side view of a sensing module including multiple constructed levels comprising electronic substrates with electronic components mounted thereon in accordance with an exemplary embodiment; -
FIG. 23 is a perspective view of an exemplary loop antenna in accordance with one embodiment; -
FIG. 24 is a perspective view of an integrated loop antenna according to another embodiment; -
FIG. 25 Illustrates by way of example a plot of normalized radiated field strength versus frequency performance of an example loop antenna integrated into a flexible substrate of the electronic circuit board; and -
FIG. 26 Illustrates a radiation pattern of the loop antenna integrated into a flexible substrate of an electronic circuit in accordance with an exemplary embodiment. - Embodiments of the invention are broadly directed to measurement of physical parameters. Many physical parameters of interest within physical systems or bodies can be measured by evaluating changes in the characteristics of energy waves or pulses. As one example, changes in the transit time or shape of an energy wave or pulse propagating through a changing medium can be measured to determine the forces acting on the medium and causing the changes. The propagation velocity of the energy waves or pulses in the medium is affected by physical changes in of the medium. The physical parameter or parameters of interest can include, but are not limited to, measurement of load, force, pressure, displacement, density, viscosity, localized temperature. These parameters can be evaluated by measuring changes in the propagation time of energy pulses or waves relative to orientation, alignment, direction, or position as well as movement, rotation, or acceleration along an axis or combination of axes by wireless sensing modules or devices positioned on or within a body, instrument, appliance, vehicle, equipment, or other physical system.
- In all of the examples illustrated and discussed herein, any specific materials, temperatures, times, energies, etc. for process steps or specific structure implementations should be interpreted to be illustrative only and non-limiting. Processes, techniques, apparatus, and materials as known by one of ordinary skill in the art may not be discussed in detail but are intended to be part of an enabling description where appropriate.
- Note that similar reference numerals and letters refer to similar items in the following figures. In some cases, numbers from prior illustrations will not be placed on subsequent figures for purposes of clarity. In general, it should be assumed that structures not identified in a figure are the same as previous prior figures.
- In the present invention these parameters are measured with an integrated wireless sensing module or device comprising an i) encapsulating structure that supports sensors and contacting surfaces and ii) an electronic assemblage that integrates a power supply, sensing elements, ultrasound resonator or resonators or transducer or transducers and ultrasound waveguide or waveguides, biasing spring or springs or other form of elastic members, an accelerometer, antennas and electronic circuitry that processes measurement data as well as controls all operations of energy conversion, propagation, and detection and wireless communications. The wireless sensing module or device can be positioned on or within, or engaged with, or attached or affixed to or within, a wide range of physical systems including, but not limited to instruments, appliances, vehicles, equipments, or other physical systems as well as animal and human bodies, for sensing and communicating parameters of interest in real time.
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FIG. 1 is an illustration of an application of sensinginsert device 100 in accordance with an exemplary embodiment. The medical device incorporates a loop antenna 107. In this example, the medical device can intra-operatively assess a load on the prosthetic knee components (implant) and collect load data for real-time viewing of the load over various applied loads and angles of flexion. By way of the loop antenna 107, a compact low-power energy source 117, and associated transceiver electronics, the sensinginsert device 100 can transmit measured load data to a receiver for permitting visualization of the level and distribution of load at various points on the prosthetic components. This can aid the surgeon in making any adjustments needed to achieve optimal joint balancing. Theinsert device 100 further includes a compact low-power energy source 117. - In general,
device 100 has at least one contacting surface that couples to the muscular-skeletal system. As shown, a first and a second contacting surface respectively couple to a femoralprosthetic component 104 and a tibialprosthetic component 106.Device 100 is designed to be used in the normal flow of an orthopedic surgical procedure without special procedures, equipment, or components. Typically, one or more natural components of the muscular-skeletal system are replaced when joint functionality substantially reduces a patient quality of life. A joint replacement is a common procedure in later life because it is prone to wear over time, can be damaged during physical activity, or by accident. - A joint of the muscular-skeletal system provides movement of bones in relation to one another that can comprise angular and rotational motion. The joint can be subjected to loading and torque throughout the range of motion. The joint typically comprises two bones that move in relation to one another with a low friction flexible connective tissue such as cartilage between the bones. The joint also generates a natural lubricant that works in conjunction with the cartilage to aid in ease of movement.
Sensing insert device 100 mimics the natural structure between the bones of the joint.Insert device 100 has a contacting surface on which a bone or a prosthetic component can moveably couple. A knee joint is disclosed for illustrative purposes butsensing insert device 100 is applicable to other joints of the muscular-skeletal system. For example, the hip, spine, and shoulder have similar structures comprising two or more bones that move in relation to one another. In general,insert device 100 can be used between two or more bones allowing movement of the bones during measurement or maintaining the bones in a fixed position. - The load
sensor insert device 100 and thereceiver station 110 forms a communication system for conveying data via secure wireless transmission within a broadcasting range over short distances on the order of a few meters to protect against any form of unauthorized or accidental query. In one embodiment, the transmission range is five meters or less which is approximately a dimension of an operating room. In practice, it can be a shorter distance 1-2 meters to transmit to a display outside the sterile field. The transmit distance will be even shorter whendevice 100 is used in a prosthetic implanted component. Transmission occurs through the skin of the patient and is likely limited to less than 0.5 meters. A combination of cyclic redundancy checks and a high repetition rate of transmission during data capture permits discarding of corrupted data without materially affecting display of data - In the illustration, a surgical procedure is performed to place a femoral
prosthetic component 104 onto a prepared distal end of thefemur 102. Similarly, a tibialprosthetic component 106 is placed to a prepared proximal end of thetibia 108. The tibialprosthetic component 106 can be a tray or plate affixed to a planarized proximal end of thetibia 108. Thesensing insert device 100 is a third prosthetic component that is placed between the plate of the tibialprosthetic component 106 and the femoralprosthetic component 104. The three prosthetic components enable the prostheses to emulate the functioning of a natural knee joint. In one embodiment,sensing insert device 100 is used during surgery and replaced with a final insert after quantitative measurements are taken to ensure optimal fit, balance, and loading of the prosthesis. - In one embodiment,
sensing insert device 100 is a mechanical replica of a final insert. In other words, sensinginsert device 100 has substantially equal dimensions to the final insert. The substantial equal dimensions ensure that the final insert when placed in the reconstructed joint will have similar loading and balance as that measured by sensinginsert device 100 during the trial phase of the surgery. Moreover, passive trial inserts are commonly used during surgery to determine the appropriate final insert. Thus, the procedure remains the same. It can measure loads at various points (or locations) on the femoralprosthetic component 104 and transmit the measured data to a receivingstation 110 by way of an integrated loop antenna 107. The receivingstation 110 can include data processing, storage, or display, or combination thereof and provide real time graphical representation of the level and distribution of the load. - As one example, the
sensing insert device 100 can measure forces (Fx, Fy, and Fz) with corresponding locations and torques (e.g. Tx, Ty, and Tz) on the femoralprosthetic component 104 and the tibialprosthetic component 106. It can then transmit this data to the receivingstation 110 to provide real-time visualization for assisting the surgeon in identifying any adjustments needed to achieve optimal joint balancing. - In a further example, an external
wireless energy source 125 can be placed in proximity to themedical sensing device 100 to initiate a wireless power recharging operation. As an example, the externalwireless energy source 125 generates energy transmissions that are wirelessly directed to themedical sensing device 100 and received as energy waves via resonant inductive coupling. The externalwireless energy source 125 can modulate a power signal generating the energy transmissions to convey downlink data that is then demodulated from the energy waves at themedical sensing device 100. As described above, thesensing insert device 100 is asensing insert device 100 suitable for use in knee joint replacement surgery. The externalwireless energy source 125 can be used to power thesensing insert device 100 during the surgical procedure or thereafter when the surgery is complete and thesensing insert device 100 is implanted for long-term use. The method can also be used to provide power and communication where thesensing insert device 100 is in a final insert that is part of the final prosthesis implanted in the patient. - In one system embodiment, the
sensing insert device 100 transmits measured parameter data to areceiver 110 via one-way data communication over the up-link channel for permitting visualization of the level and distribution of the parameter at various points on the prosthetic components. This, combined with cyclic redundancy check error checking, provides high security and protection against any form of unauthorized or accidental interference with a minimum of added circuitry and components. This can aid the surgeon in making any adjustments needed to optimize the installation. In addition to transmitting one-way data communications over the up-link channel to thereceiver station 110, thesensing insert device 100 can receive downlink data from the externalwireless energy source 125 during the wireless power recharging operation. The downlink data can include component information, such as a serial number, or control information, for controlling operation of thesensing insert device 100. This data can then be uploaded to the receivingsystem 110 upon request via the one-way up-link channel, in effect providing two-way data communications over separate channels. - Separating uplink and downlink telemetry eliminates the need for transmit-receive circuitry within the
sensing insert device 100. Two unidirectional telemetry channels operating on different frequencies or with different forms of energy enables simultaneous up and downlink telemetry. Modulating energy emissions from the externalwireless energy source 125 as a carrier for instructions achieves these benefits with a minimum of additional circuitry and components by leveraging existing circuitry and antenna, induction loop, or piezoelectric components on the loadsensor insert device 100. The frequencies of operation of the up and downlink telemetry channels can also be selected and optimized to interface with other devices, instruments, or equipment as needed. Separating uplink and downlink telemetry also enables addition of downlink telemetry without altering or upgrading existing chip-set telemetry for the one-way transmit. That is, existing chip-set telemetry can be used for encoding and packaging data and error checking without modification, yet remain communicatively coupled to the separate wireless power down-link telemetry operation for download operations herein contemplated. - As shown, the
wireless energy source 125 can include apower supply 126, amodulation circuit 127, and adata input 128. Thepower supply 126 can be a battery, a charging device, a capacitor, a power connection, or other energy source for generating wireless power signals to power thesensing insert device 100. The external wireless energy source can transmit energy in the form of, but not limited to, electromagnetic induction, or other electromagnetic or ultrasound emissions. In at least one exemplary embodiment, thewireless energy source 125 includes a coil to electromagnetically couple with an induction coil insensing device 100 when placed in close proximity. Thedata input 128 can be a user interface component (e.g., keyboard, keypad, or touchscreen) that receives input information (e.g., serial number, control codes) to be downloaded to the loadsensor insert device 100. Thedata input 128 can also be an interface or port to receive the input information from another data source, such as from a computer via a wired or wireless connection (e.g., USB, IEEE802.16, etc.). Themodulation circuitry 127 can modulate the input information onto the power signals generated by thepower supply 126. -
FIG. 2 is an illustration of asensing insert device 100 placed in a joint of the muscular-skeletal system for measuring a parameter in accordance with an exemplary embodiment. In particular, sensinginsert device 100 is placed in contact between afemur 102 and atibia 108 for measuring a parameter. In the example, a force, pressure, or load is being measured. Thedevice 100 in this example can intra-operatively assess a load on prosthetic components during the surgical procedure. As mentioned previously,sensing insert device 100 collects data for real-time viewing of the load forces over various applied loads and angles of flexion. It can measure the level and distribution of load at various points on the prosthetic component and transmit the measured load data by way data communication to areceiver station 110 for permitting visualization. This can aid the surgeon in making any adjustments needed to achieve optimal joint balancing. - A proximal end of
tibia 108 is prepared to receive tibialprosthetic component 106. Tibialprosthetic component 106 is a support structure that is fastened to the proximal end of the tibia and is usually made of a metal or metal alloy. The tibialprosthetic component 106 also retains the insert in a fixed position with respect totibia 108. Similarly, a distal end offemur 102 is prepared to receive femoralprosthetic component 104. The femoralprosthetic component 104 is generally shaped to have an outer condylar articulating surface. The preparation offemur 102 andtibia 108 is aligned to the mechanical axis of the leg. Thesensing insert device 100 provides a concave or flat surface against which the outer condylar articulating surface of the femoralprosthetic component 104 rides relative to thetibia prosthetic component 106. In particular, the top surface of thesensing module 200 faces the condylar articulating surface of the femoralprosthetic component 104, and the bottom surface of theinsert dock 202 faces the top surface of the tibialprosthetic component 106. - A final insert is subsequently fitted between femoral
prosthetic component 104 and tibialprosthetic component 106 that has a bearing surface that couples tofemoral component 104 allowing the leg a natural range of motion. The final insert has a wear surface that is typically made of a low friction polymer material. Ideally, the prosthesis has an appropriate loading, alignment, and balance that mimics the natural leg and maximizes the life of the artificial components. It should be noted thatsensing module 200 can be placed a final insert and operated similarly as disclosed herein. Thesensing module 200 can be used to periodically monitor status of the permanent joint. - The
sensing insert device 100 is used to measure, adjust, and test the reconstructed joint prior to installing the final insert. As mentioned previously, thesensing insert device 100 is placed between thefemur 102 andtibia 108. The condyle surface offemoral component 104 contacts a major surface ofdevice 100. The major surface ofdevice 100 approximates a surface of a final insert. Tibialprosthetic component 106 can include a cavity or tray on the major surface that receives and retains aninsert dock 202 and asensing module 200 during a measurement process. It should be noted thatsensing insert device 100 is coupled to and provides measurement data in conjunction with other implanted prosthetic components. In other words, the prosthetic components are the permanent installed components of the patient. -
Insert dock 202 is provided in different sizes and shapes.Insert dock 202 can comprise many different sizes and shapes to interface appropriately with different manufacturer prosthetic components. Prosthetic components are made in different sizes to accommodate anatomical differences over a wide population range.Insert dock 202 is designed for different prosthetic sizes within the same manufacturer. In at least one embodiment, multiple docks of different dimensions are provided for a surgery. For example, the thickness of the final insert is determined by the surgical cuts to the muscular-skeletal system and measurements provided bysensing module 200. The surgeon may try two insertdocks 202 of different thicknesses before making a final decision. In one embodiment,sensing insert device 100 selected by the surgeon has substantially equal dimensions to the final insert used. In general,insert dock 202 allows standardization on asingle sensing module 200 for different prosthetic platforms. Thus, thesensing module 200 is common to thedifferent insert docks 202 allowing improved quality, reliability, and performance. - In one embodiment, one or
more insert docks 202 are used to determine an appropriate thickness that yields an optimal loading. In general, the absolute loading over the range of motion is kept within a predetermined range. Soft tissue tensioning can be used to adjust the absolute loading. The knee balance can also be adjusted within a predetermined range if a total knee reconstruction is being performed and asensing module 202 is used in each compartment. Tibialprosthetic component 106 anddevice 100 have a combined thickness that represents a combined thickness of tibialprosthetic component 106 and a final (or chronic) insert of the knee joint. Thus, the final insert thickness or depth is chosen based on the trial performed usingdevice 100. Typically, the final insert thickness is identical to thedevice 100 to maintain the measured loading and balance. In one embodiment,sensing module 200 and insertdocks 202 are disposed of after surgery. Alternatively, thesensing module 200 and insertdocks 202 can be cleaned, sterilized, and packaged for reuse. - The
prosthesis incorporating device 100 emulates the function of a natural knee joint.Device 100 can measure loads or other parameters at various points throughout the range of motion. Data fromdevice 100 is transmitted to a receivingstation 110 via wired or wireless communications. In a first embodiment,device 100 is a disposable system.Device 100 can be disposed of after using thesensing insert device 100 to optimally fit the joint implant.Device 100 is a low cost disposable system that reduces capital costs, operating costs, facilitates rapid adoption of quantitative measurement, and initiates evidentiary based orthopedic medicine. In a second embodiment, a methodology can be put in place to clean and sterilizedevice 100 for reuse. In a third embodiment,device 100 can be incorporated in a tool instead of being a component of the replacement joint. The tool can be disposable or be cleaned and sterilized for reuse. In a fourth embodiment,device 100 can be a permanent component of the replacement joint.Device 100 can be used to provide both short term and long term post-operative data on the implanted joint. In a fifth embodiment,device 100 can be coupled to the muscular-skeletal system. In all of the embodiments, receivingstation 110 can include data processing, storage, or display, or combination thereof and provide real time graphical representation of the level and distribution of the load. Receivingstation 110 can record and provide accounting information ofdevice 100 to an appropriate authority. - The
sensing insert device 100, in one embodiment, comprises aload sensing platform 121, anaccelerometer 122, andsensing assemblies 123. This permits thesensing device 100 to assess a total load on the prosthetic components when it is being moved. The system accounts for forces due to gravity and motion. In one embodiment,load sensing platform 121 includes two or more load bearing surfaces, at least one energy transducer, at least one compressible energy propagating structure, and at least one member for elastic support. Theaccelerometer 122 can measure acceleration. Acceleration can occur when thesensing device 100 is moved or put in motion.Accelerometer 122 can sense orientation, vibration, and impact. In another embodiment, thefemoral component 104 can similarly include anaccelerometer 135, which by way of a communication interface to thesensing insert device 100, can provide reference position and acceleration data to determine an exact angular relationship between the femur and tibia. Thesensing assemblies 123 can reveal changes in length or compression of the energy propagating structure or structures by way of the energy transducer or transducers. Together theload sensing platform 121, accelerometer 122 (and in certain cases accelerometer 135), andsensing assemblies 123 measure force or pressure external to theload sensing platform 121 or displacement produced by contact with the prosthetic components. - In at least one exemplary embodiment, an energy pulse is directed within one or more waveguides in
device 100 by way of pulse mode operations and pulse shaping. The waveguide is a conduit that directs the energy pulse in a predetermined direction. The energy pulse is typically confined within the waveguide. In one embodiment, the waveguide comprises a polymer material. For example, urethane or polyethylene are polymers suitable for forming a waveguide. The polymer waveguide can be compressed and has little or no hysteresis in the system. Alternatively, the energy pulse can be directed through the muscular-skeletal system. In one embodiment, the energy pulse is directed through bone of the muscular-skeletal system to measure bone density. A transit time of an energy pulse is related to the material properties of a medium through which it traverses. This relationship is used to generate accurate measurements of parameters such as distance, weight, strain, pressure, wear, vibration, viscosity, and density to name but a few. - Incorporating data from the
accelerometer 122 with data from theother sensing components - The
accelerometer 122 can operate singly, as an integrated unit with theload sensing platform 121, and/or as an integrated unit with thesensing assemblies 123. Integrating one ormore accelerometers 122 within thesensing assemblages 123 to determine position, attitude, movement, or acceleration of sensingassemblages 123 enables augmentation of presentation of data to accurately identify, but not limited to, orientation or spatial distribution of load, force, pressure, displacement, density, or viscosity, or localized temperature by controlling the load and position sensing assemblages to measure the parameter or parameters of interest relative to specific orientation, alignment, direction, or position as well as movement, rotation, or acceleration along any axis or combination of axes. Measurement of the parameter or parameters of interest may also be made relative to the earth's surface and thus enable computation and presentation of spatial distributions of the measured parameter or parameters relative to this frame of reference. - In one embodiment, the
accelerometer 122 includes direct current (DC) sensitivity to measure static gravitational pull with load and position sensing assemblages to enable capture of, but not limited to, distributions of load, force, pressure, displacement, movement, rotation, or acceleration by controlling the sensing assemblages to measure the parameter or parameters of interest relative to orientations with respect to the earths surface or center and thus enable computation and presentation of spatial distributions of the measured parameter or parameters relative to this frame of reference. - Embodiments of
device 100 are broadly directed to measurement of physical parameters, and more particularly, to evaluating changes in the transit time of a pulsed energy wave propagating through a medium. In-situ measurements during orthopedic joint implant surgery would be of substantial benefit to verify an implant is in balance and under appropriate loading or tension. In one embodiment, the instrument is similar to and operates familiarly with other instruments currently used by surgeons. This will increase acceptance and reduce the adoption cycle for a new technology. The measurements will allow the surgeon to ensure that the implanted components are installed within predetermined ranges that maximize the working life of the joint prosthesis and reduce costly revisions. Providing quantitative measurement and assessment of the procedure using real-time data will produce results that are more consistent. A further issue is that there is little or no implant data generated from the implant surgery, post-operatively, and long term.Device 100 can provide implant status data to the orthopedic manufacturers and surgeons. Moreover, data generated by direct measurement of the implanted joint itself would greatly improve the knowledge of implanted joint operation and joint wear thereby leading to improved design and materials. - As mentioned previously,
device 100 can be used for other joint surgeries; it is not limited to knee replacement implant or implants. Moreover,device 100 is not limited to trial measurements.Device 100 can be incorporated into the final joint system to provide data post-operatively to determine if the implanted joint is functioning correctly. Early determination of aproblem using device 100 can reduce catastrophic failure of the joint by bringing awareness to a problem that the patient cannot detect. The problem can often be rectified with a minimal invasive procedure at lower cost and stress to the patient. Similarly, longer term monitoring of the joint can determine wear or misalignment that if detected early can be adjusted for optimal life or replacement of a wear surface with minimal surgery thereby extending the life of the implant. In general,device 100 can be shaped such that it can be placed or engaged or affixed to or within load bearing surfaces used in many orthopedic applications (or used in any orthopedic application) related to the musculoskeletal system, joints, and tools associated therewith.Device 100 can provide information on a combination of one or more performance parameters of interest such as wear, stress, kinematics, kinetics, fixation strength, ligament balance, anatomical fit and balance. -
FIG. 3 is a perspective view of a medical sensing platform comprising an encapsulating enclosure in accordance with one embodiment. In general, parameters of the muscular-skeletal system can be measured with asensing module 200 that in one embodiment is an integral part of a completesensing insert device 100. Thesensing module 200 is a self-contained sensor within an encapsulating enclosure that integrates sensing assemblages, an electronic assemblage that couples to the sensing assemblages, a power source, signal processing, and wireless communication. All components required for the measurement are contained in thesensing module 200. Thesensing module 200 has at least one contacting surface for coupling to the muscular-skeletal system. A parameter of the muscular-skeletal system is applied to the contact surfaces to be measured by the one or more sensing assemblages therein. As will be disclosed in further detail herein, thesensing module 200 is part of a system that allows intra-operative and post-operative sensing of a joint of the muscular-skeletal system. More specifically,sensing module 200 is placed within a temporary or permanent prosthetic component that has a similar form factor as the passive prosthetic component currently being used. This has a benefit of rapid adoption because the sensing platform is inserted identically to the commonly used passive component but can provide much needed quantitative measurements with little or no procedural changes. - As shown, the
sensing insert device 100 comprises aninsert dock 202 and thesensing module 200.Sensing insert device 100 is a non-permanent or temporary measurement device that is used intra-operatively to provide quantitative data related to the installation of prosthetic components such as in joint replacement surgery. The combination of theinsert dock 202 andsensing module 202 has a form factor substantially equal to a final insert device. The final insert device can be a passive component or sensored incorporatingsensing module 200. The substantially equal form factor ofsensing insert device 100 results in no extraneous structures in the surgical field that can interfere with the procedure. For example, a final insert device is designed to mimic the function of the natural component it is replacing. The final insert device allows natural movement of the muscular-skeletal system and does not interfere with ligaments, tendons, tissue, muscles, and other components of the muscular-skeletal system. Similarly,sensing insert device 100 allows exposure of the surgical field around the joint by having the similar form factor as the final insert thereby allowing the surgeon to make adjustments during the installation in a natural setting with quantitative measurements to support the modifications. - In one embodiment,
insert dock 202 is an adaptor.Insert dock 202 is made in different sizes. In general, prosthetic components are manufactured in different sizes to accommodate variation in the muscular-skeletal system from person to person. In the example, the size ofinsert dock 202 is chosen to mate with the selected prosthetic implant components. In particular, afeature 204 aligns with and retainsinsert dock 202 in a fixed position to a prosthetic or natural component of the muscular-skeletal system. Theinsert dock 202 is a passive component having an opening for receivingsensing module 200. The opening is positioned to place the contacting surfaces in a proper orientation to measure the parameter when used in conjunction with other prosthetic components. Theinsert dock 202 as an adaptor can be manufactured at low cost. Moreover, insertdock 202 can be formed for adapting to different prosthetic manufacturers thereby increasing system flexibility. This allows astandard sensing module 200 to be provided but customized for appropriate size and dimensions throughdock 202 for the specific application and manufacturer component. - The one or more sensing assemblages within
sensing module 200 couple to the contacting surfaces ofsensing module 200 for receiving the applied parameter of the muscular-skeletal system. In one embodiment, a sensing assemblage comprises one or more energy transducers coupled to an elastic structure. The elastic structure allows the propagation of energy waves. The forms of energy propagated through the elastic energy propagating structures may include, but is not limited to, sound, ultrasound, or electromagnetic radiation including radio frequency, infrared, or light. A change in the parameter applied to the contacting surfaces results in a change a dimension of the elastic structure. The dimension of the elastic structure can be measured precisely using continuous wave, pulsed, or pulsed echo measurement. The dimension and material properties of the elastic structure have a known relationship to the parameter being measured. Thus, the dimension is precisely measured and converted to the parameter. Other factors such as movement or acceleration can be taken into account in the calculation. As an example, a force, pressure, or load applied to the one or more contacting surfaces ofsensing module 200 is used to illustrate a parameter measurement hereinbelow. It should be noted that this is for illustration purposes and that thesensing module 200 can be used to measure other parameters. - As will be shown ahead, the encapsulating enclosure can serve in a first embodiment as a trial implant for orthopedic surgical procedures, namely, for determining load forces on prosthetic components and the musculoskeletal system. In a second embodiment, the encapsulating enclosure can be placed within a permanent prosthetic component for long term monitoring. The encapsulating enclosure supports and protects internal mechanical and electronic components from external physical, mechanical, chemical, and electrical, and electromagnetic intrusion that might compromise sensing or communication operations of the module or device. The integration of the internal components is designed to minimize adverse physical, mechanical, electrical, and ultrasonic interactions that might compromise sensing or communication operations of the module or device.
-
FIG. 4 is a perspective view of a medical sensing device suitable for use as a bi-compartmental implant and comprising an encapsulating enclosure in accordance with one embodiment. As shown, thesensing insert device 100 comprises two sensingmodules 200. Eachsensing module 200 is a self-contained encapsulated enclosure that can make individual or coordinated parameter measurements. For example, thesensing insert device 100 can be used to assess load forces on a bi-compartmental knee joint implant. In particular, both sensingmodules 200 can individually, or in combination, report applied loading forces. Bi-compartmental sensing provides the benefit of providing quantitative measurement to balance each compartment in relation to one another. - Similar to that described above,
insert dock 202 is an adaptor having two openings instead of one.Insert dock 202 can be made in different sizes to accommodated different sized prosthetic components and different manufacturers. Theinsert dock 202 with two openings is a passive component for receiving twoseparate sensing modules 200. The opening is positioned to place the contacting surfaces in a proper orientation to measure the parameter when used in conjunction with other prosthetic components. In general, encapsulated enclosures can be positioned on or within, or engaged with, or attached or affixed to or within, a wide range of physical systems including, but not limited to instruments, appliances, vehicles, equipments, or other physical systems as well as animal and human bodies, for sensing and communicating the parameter or parameters of interest in real time. Similar to that described above,insert dock 202 as an adaptor can be manufactured at low cost providing design flexibility and allowing rapid adoption of quantitative measurement. -
FIG. 5 is an exemplary block diagram of the components of thesensing module 200 in accordance with an exemplary embodiment. It should be noted that the sensing module could comprise more or less than the number of components shown. As illustrated, the sensing module includes one ormore sensing assemblages 303, atransceiver 320, anenergy storage 330,electronic circuitry 307, one or more mechanical supports 315 (e.g., springs), and anaccelerometer 302. In the non-limiting example, an applied compressive force can be measured by the sensing module. - The
sensing assemblage 303 can be positioned, engaged, attached, or affixed to the contact surfaces 306. Mechanical supports 315 serve to provide proper balancing of contact surfaces 306. In at least one exemplary embodiment, contact surfaces 306 are load-bearing surfaces. In general, thepropagation structure 305 is subject to the parameter being measured.Surfaces 306 can move and tilt with changes in applied load; actions which can be transferred to thesensing assemblages 303 and measured by theelectronic circuitry 307. Theelectronic circuitry 307 measures physical changes in thesensing assemblage 303 to determine parameters of interest, for example a level, distribution and direction of forces acting on the contact surfaces 306. In general, the sensing module is powered by theenergy storage 330. - As one example, the
sensing assemblage 303 can comprise an elastic orcompressible propagation structure 305 between atransducer 304 and atransducer 314. In the current example,transducer 304 can be an ultrasound (or ultrasonic) resonator, and the elastic orcompressible propagation structure 305 can be an ultrasound (or ultrasonic) waveguide (or waveguides). Theelectronic circuitry 307 is electrically coupled to thesensing assemblages 303 and translates changes in the length (or compression or extension) of thesensing assemblages 303 to parameters of interest, such as force. It measures a change in the length of the propagation structure 305 (e.g., waveguide) responsive to an applied force and converts this change into electrical signals which can be transmitted via thetransceiver 320 to convey a level and a direction of the applied force. In other arrangements herein contemplated, thesensing assemblage 303 may require only a single transducer. In yet other arrangements, thesensing assemblage 303 can include piezoelectric, capacitive, optical or temperature sensors or transducers to measure the compression or displacement. It is not limited to ultrasonic transducers and waveguides. - The
accelerometer 302 can measure acceleration and static gravitational pull.Accelerometer 302 can be single-axis and multi-axis accelerometer structures that detect magnitude and direction of the acceleration as a vector quantity.Accelerometer 302 can also be used to sense orientation, vibration, impact and shock. Theelectronic circuitry 307 in conjunction with theaccelerometer 302 andsensing assemblies 303 can measure parameters of interest (e.g., distributions of load, force, pressure, displacement, movement, rotation, torque and acceleration) relative to orientations of the sensing module with respect to a reference point. In such an arrangement, spatial distributions of the measured parameters relative to a chosen frame of reference can be computed and presented for real-time display. - The
transceiver 320 comprises atransmitter 309 and anantenna 310 to permit wireless operation and telemetry functions. In various embodiments, theantenna 310 can be configured by design as an integrated loop antenna. As will be explained ahead, the integrated loop antenna is configured at various layers and locations on the electronic substrate with electrical components and by way of electronic control circuitry to conduct efficiently at low power levels. Once initiated thetransceiver 320 can broadcast the parameters of interest in real-time. The telemetry data can be received and decoded with various receivers, or with a custom receiver. The wireless operation can eliminate distortion of, or limitations on, measurements caused by the potential for physical interference by, or limitations imposed by, wiring and cables connecting the sensing module with a power source or with associated data collection, storage, display equipment, and data processing equipment. - The
transceiver 320 receives power from theenergy storage 330 and can operate at low power over various radio frequencies by way of efficient power management schemes, for example, incorporated within theelectronic circuitry 307. As one example, thetransceiver 320 can transmit data at selected frequencies in a chosen mode of emission by way of theantenna 310. The selected frequencies can include, but are not limited to, ISM bands recognized in InternationalTelecommunication Union regions - The
antenna 310 can be integrated with components of the sensing module to provide the radio frequency transmission. The substrate for theantenna 310 and electrical connections with theelectronic circuitry 307 can further include a matching network. This level of integration of the antenna and electronics enables reductions in the size and cost of wireless equipment. Potential applications may include, but are not limited to any type of short-range handheld, wearable, or other portable communication equipment where compact antennas are commonly used. This includes disposable modules or devices as well as reusable modules or devices and modules or devices for long-term use. - The
energy storage 330 provides power to electronic components of the sensing module. It can be charged by wired energy transfer, short-distance wireless energy transfer or a combination thereof. External power sources can include, but are not limited to, a battery or batteries, an alternating current power supply, a radio frequency receiver, an electromagnetic induction coil, a photoelectric cell or cells, a thermocouple or thermocouples, or an ultrasound transducer or transducers. By way of theenergy storage 330, the sensing module can be operated with a single charge until the internal energy is drained. It can be recharged periodically to enable continuous operation. Theenergy storage 330 can utilize power management technologies such as replaceable batteries, supply regulation technologies, and charging system technologies for supplying energy to the components of the sensing module to facilitate wireless applications. - The
energy storage 330 minimizes additional sources of energy radiation required to power the sensing module during measurement operations. In one embodiment, as illustrated, theenergy storage 330 can include a capacitiveenergy storage device 308 and aninduction coil 311. External source of charging power can be coupled wirelessly to the capacitiveenergy storage device 308 through the electromagnetic induction coil or coils 311 by way of inductive charging. The charging operation can be controlled by power management systems designed into, or with, theelectronic circuitry 307. As one example, during operation ofelectronic circuitry 307, power can be transferred from capacitiveenergy storage device 308 by way of efficient step-up and step-down voltage conversion circuitry. This conserves operating power of circuit blocks at a minimum voltage level to support the required level of performance. - In one configuration, the
energy storage 330 can further serve to communicate downlink data to thetransceiver 320 during a recharging operation. For instance, downlink control data can be modulated onto the energy source signal and thereafter demodulated from theinduction coil 311 by way ofelectronic control circuitry 307. This can serve as a more efficient way for receiving downlink data instead of configuring thetransceiver 320 for both uplink and downlink operation. As one example, downlink data can include updated control parameters that the sensing module uses when making a measurement, such as external positional information, or for recalibration purposes, such as spring biasing. It can also be used to download a serial number or other identification data. - The
electronic circuitry 307 manages and controls various operations of the components of the sensing module, such as sensing, power management, telemetry, and acceleration sensing. It can include analog circuits, digital circuits, integrated circuits, discrete components, or any combination thereof. In one arrangement, it can be partitioned among integrated circuits and discrete components to minimize power consumption without compromising performance. Partitioning functions between digital and analog circuit enhances design flexibility and facilitates minimizing power consumption without sacrificing functionality or performance. Accordingly, theelectronic circuitry 307 can comprise one or more Application Specific Integrated Circuit (ASIC) chips, for example, specific to a core signal processing algorithm. - In another arrangement, the electronic circuitry can comprise a controller such as a programmable processor, a Digital Signal Processor (DSP), a microcontroller, or a microprocessor, with associated storage memory and logic. The controller can utilize computing technologies with associated storage memory such a Flash, ROM, RAM, SRAM, DRAM or other like technologies for controlling operations of the aforementioned components of the sensing module. In one arrangement, the storage memory may store one or more sets of instructions (e.g., software) embodying any one or more of the methodologies or functions described herein. The instructions may also reside, completely or at least partially, within other memory, and/or a processor during execution thereof by another processor or computer system.
- The electronics assemblage also supports testability and calibration features that assure the quality, accuracy, and reliability of the completed wireless sensing module or device. A temporary bi-directional interconnect assures a high level of electrical observability and controllability of the electronics. The test interconnect also provides a high level of electrical observability of the sensing subsystem, including the transducers, waveguides, and mechanical spring or elastic assembly. Carriers or fixtures emulate the final enclosure of the completed wireless sensing module or device during manufacturing processing thus enabling capture of accurate calibration data for the calibrated parameters of the finished wireless sensing module or device. These calibration parameters are stored within the on-board memory integrated into the electronics assemblage.
- Applications for
sensing module 200 may include, but are not limited to, disposable modules or devices as well as reusable modules or devices and modules or devices for long-term use. In addition to non-medical applications, examples of a wide range of potential medical applications may include, but are not limited to, implantable devices, modules within implantable devices, intra-operative implants or modules within intra-operative implants or trial inserts, modules within inserted or ingested devices, modules within wearable devices, modules within handheld devices, modules within instruments, appliances, equipment, or accessories of all of these, or disposables within implants, trial inserts, inserted or ingested devices, wearable devices, handheld devices, instruments, appliances, equipment, or accessories to these devices, instruments, appliances, or equipment. -
FIG. 6 is a diagram of anexemplary communications system 400 for short-range telemetry according to one embodiment. As illustrated, theexemplary communications system 400 comprises medicaldevice communications components 410 of the sensing insert device 100 (seeFIG. 1 ) and receivingsystem communications components 450 of the receiving system 110 (seeFIG. 1 ). The medicaldevice communications components 410 are inter-operatively coupled to include, but not limited to, theantenna 412, amatching network 414, thetelemetry transceiver 416, aCRC circuit 418, adata packetizer 422, adata input 424, apower source 426, and an application specific integrated circuit (ASIC) 420. The medicaldevice communications components 410 may include more or less than the number of components shown and are not limited to those shown or the order of the components. - The receiving
station communications components 450 comprise anantenna 452, thematching network 454, thetelemetry receiver 456, theCRC circuit 458, thedata packetizer 460, and optionally aUSB interface 462. Notably, other interface systems can be directly coupled to the data packetizer 460 for processing and rendering sensor data. - With respect to
FIG. 1 , in view of the communication components ofFIG. 6 , thesensing insert device 100 acquires sensor data by way of the data input to theASIC 420. Referring briefly toFIG. 5 , theASIC 420 is operatively coupled to sensingassemblies 303. In one embodiment, a change in the parameter being measured bydevice 100 produces a change in a length of acompressible propagation structure 305.ASIC 420 controls the emission of energy waves intopropagation structure 305 and the detection of propagated energy waves.ASIC 420 generates data related to transit time, frequency, or phase of propagated energy waves. The data corresponds to the length ofpropagation structure 305, which can be translated to the parameter of interest by way of a known function or relationship. Similarly, the data can comprise voltage or current measurements from a MEMS structure, piezo-resistive sensor, strain gauge, or other sensor type that is used to measure the parameter. The data packetizer 422 assembles the sensor data into packets; this includes sensor information received or processed byASIC 420. TheASIC 420 can comprise specific modules for efficiently performing core signal processing functions of the medicaldevice communications components 410. TheASIC 420 provides the further benefit of reducing the form factor ofsensing insert device 100 to meet dimensional requirements for integration into temporary or permanent prosthetic components. - The
CRC circuit 418 applies error code detection on the packet data. The cyclic redundancy check is based on an algorithm that computes a checksum for a data stream or packet of any length. These checksums can be used to detect interference or accidental alteration of data during transmission. Cyclic redundancy checks are especially good at detecting errors caused by electrical noise and therefore enable robust protection against improper processing of corrupted data in environments having high levels of electromagnetic activity. Thetelemetry transmitter 416 then transmits the CRC encoded data packet through thematching network 414 by way of theantenna 412. The matchingnetworks - The receiving
system communications components 450 receive transmission sent by medicaldevice communications components 410. In one embodiment,telemetry transmitter 416 is operated in conjunction with adedicated telemetry receiver 456 that is constrained to receive a data stream broadcast on the specified frequencies in the specified mode of emission. Thetelemetry receiver 456 by way of the receivingstation antenna 452 detects incoming transmissions at the specified frequencies. Theantenna 452 can be a directional antenna that is directed to a directional antenna ofcomponents 410. Using at least one directional antenna can reduce data corruption while increasing data security by further limiting where the data is radiated. Amatching network 454 couples toantenna 452 to provide an impedance match that efficiently transfers the signal fromantenna 452 totelemetry receiver 456.Telemetry receiver 456 can reduce a carrier frequency in one or more steps and strip off the information or data sent bycomponents 410.Telemetry receiver 456 couples toCRC circuit 458.CRC circuit 458 verifies the cyclic redundancy checksum for individual packets of data.CRC circuit 458 is coupled todata packetizer 460.Data packetizer 460 processes the individual packets of data. In general, the data that is verified by theCRC circuit 458 is decoded (e.g., unpacked) and forwarded to an external data processing device, such as an external computer, for subsequent processing, display, or storage or some combination of these. - The
telemetry receiver 456 is designed and constructed to operate on very low power such as, but not limited to, the power available from thepowered USB port 462, or a battery. In another embodiment, thetelemetry receiver 456 is designed for use with a minimum of controllable functions to limit opportunities for inadvertent corruption or malicious tampering with received data. Thetelemetry receiver 456 can be designed and constructed to be compact, inexpensive, and easily manufactured with standard manufacturing processes while assuring consistently high levels of quality and reliability. - In one configuration, the
communication system 400 operates in a transmit-only operation with a broadcasting range on the order of a few meters to provide high security and protection against any form of unauthorized or accidental query. The transmission range can be controlled by the transmitted signal strength, antenna selection, or a combination of both. A high repetition rate of transmission can be used in conjunction with the Cyclic Redundancy Check (CRC) bits embedded in the transmitted packets of data during data capture operations thereby enabling the receivingsystem 110 to discard corrupted data without materially affecting display of data or integrity of visual representation of data, including but not limited to measurements of load, force, pressure, displacement, flexion, attitude, and position within operating or static physical systems. - By limiting the operating range to distances on the order of a few meters the
telemetry transmitter 416 can be operated at very low power in the appropriate emission mode or modes for the chosen operating frequencies without compromising the repetition rate of the transmission of data. This mode of operation also supports operation with compact antennas, such as an integrated loop antenna. The combination of low power and compact antennas enables the construction of, but is not limited to, highly compact telemetry transmitters that can be used for a wide range of non-medical and medical applications. Examples of potential medical applications may include, but are not limited to, implantable devices, modules within implantable devices, intra-operative implants or modules within intra-operative implants or trial inserts, modules within inserted or ingested devices, modules within wearable devices, modules within handheld devices, modules within instruments, appliances, equipment, or accessories of all of these, or disposables within implants, trial inserts, inserted or ingested devices, wearable devices, handheld devices, instruments, appliances, equipment, or accessories to these devices, instruments, appliances, or equipment. - The transmitter security as well as integrity of the transmitted data is assured by operating the telemetry system within predetermined conditions. The security of the transmitter cannot be compromised because it is operated in a transmit-only mode and there is no pathway to hack into medical
device communications components 410. The integrity of the data is assured with the use of the CRC algorithm and the repetition rate of the measurements. The risk of unauthorized reception of the data is minimized by the limited broadcast range of the device. Even if unauthorized reception of the data packets should occur there are counter measures in place that further mitigate data access. A first measure is that the transmitted data packets contain only binary bits from a counter along with the CRC bits. A second measure is that no data is available or required to interpret the significance of the binary value broadcast at any time. A third measure that can be implemented is that no patient or device identification data is broadcast at any time. - The
telemetry transmitter 416 can also operate in accordance with some FCC regulations. According to section 18.301 of the FCC regulations the ISM bands within the USA include 6.78, 13.56, 27.12, 30.68, 915, 2450, and 5800 MHz as well as 24.125, 61.25, 122.50, and 245 GHz. Globally other ISM bands, including 433 MHz, are defined by the International Telecommunications Union in some geographic locations. The list of prohibited frequency bands defined in 18.303 are “the following safety, search and rescue frequency bands is prohibited: 490-510 kHz, 2170-2194 kHz, 8354-8374 kHz, 121.4-121.6 MHz, 156.7-156.9 MHz, and 242.8-243.2 MHz.” Section 18.305 stipulates the field strength and emission levels ISM equipment must not exceed when operated outside defined ISM bands. In summary, it may be concluded that ISM equipment may be operated worldwide within ISM bands as well as within most other frequency bands above 9 KHz given that the limits on field strengths and emission levels specified in section 18.305 are maintained by design or by active control. As an alternative, commercially available ISM transceivers, including commercially available integrated circuit ISM transceivers, may be designed to fulfill these field strengths and emission level requirements when used properly. - In one configuration, the
telemetry transmitter 416 can also operate in unlicensed ISM bands or in unlicensed operation of low power equipment, wherein the ISM equipment (e.g., telemetry transmitter 416) may be operated on ANY frequency above 9 kHz except as indicated in Section 18.303 of the FCC code. - Wireless operation eliminates distortion of, or limitations on, measurements caused by the potential for physical interference by, or limitations imposed by, wiring and cables connecting the wireless sensing module or device with a power source or with data collection, storage, or display equipment. Power for the sensing components and electronic circuits is maintained within the wireless sensing module or device on an internal energy storage device. This energy storage device is charged with external power sources including, but not limited to, a battery or batteries, super capacitors, capacitors, an alternating current power supply, a radio frequency receiver, an electromagnetic induction coil, a photoelectric cell or cells, a thermocouple or thermocouples, or an ultrasound transducer or transducers. The wireless sensing module may be operated with a single charge until the internal energy source is drained or the energy source may be recharged periodically to enable continuous operation. The embedded power supply minimizes additional sources of energy radiation required to power the wireless sensing module or device during measurement operations. Telemetry functions are also integrated within the wireless sensing module or device. Once initiated the telemetry transmitter continuously broadcasts measurement data in real time. Telemetry data may be received and decoded with commercial receivers or with a simple, low cost custom receiver.
- A method can be practiced with more or less than the number of steps shown and is not limited to the order shown. To describe the method, reference will be made to the components of
FIG. 5 , although it is understood that the method can be implemented in any other manner using other suitable components. Generally, method is directed to non-secure applications for one-way transmission communications, for example, where an implanted medical device or sensor transmits data to a receiving station (e.g., 110 seeFIG. 1 ) but does not receive confirmation from the receiving station, although in various embodiments, the implanted medical device includes an integrated receiver for receiving confirmation and acknowledgement communications. - The method can start in a state wherein the
sensing insert device 100 has been inserted and powered on, for example, within a knee prosthesis implant. The medical device can be powered on via manual intervention, for example, by the surgeon or technician implanting the medical device during a surgical procedure, or the device can turn on automatically after a duration of time or at certain time intervals, for example, 1 hour after manual activation, or every 10 seconds after power up, depending on an operating mode. - In a first step, the medical device acquires sensor data such as load information (e.g., force, location, duration, etc.) from the
sensing module 200. Theelectronic circuitry 307 generates the load data by way of thesensing assemblies 303, for instance, by converting changes in length of ultrasonic propagation structures (waveguides) to force data. In a second step, thesensing module 200 evaluates data bounds on the load data. In a third step,sensing module 200 assigns priorities based on the data bounds. Sensor data outside a predetermined range or above a predefined threshold can be flagged with a priority or discarded. For example, sensor data that falls outside a safe range or exceeds a safe level (e.g., applied force level, angle of flexion, excessive rotation) is prioritized accordingly. - In a fourth step, the
sensing module 200 generates a packet of data including the sensor data, priority, and any corresponding information. In a fifth step, thesensing module 200 determines its communications mode based on operating mode and priority level. The operating mode indicates whether thesensing module 200 is operating in a power saving mode (e.g., standby) or other power management mode and takes into account information such as remaining battery life and drain. In a sixth step, a Cyclic Redundancy Check (CRC) can be appended to the data packed. In other embodiments, more sophisticated forward error correction schemes (e.g., block coding, convolutional coding) can be applied along with secure encryption or key-exchange cryptographic protocols. - The cyclic redundancy check (CRC) is a non-secure form of message digest designed to detect accidental changes to raw computer data. The CRC step comprises calculating a short, fixed-length sequence, known as the CRC code, for each block of data and sends or stores them both together. When a block is read or received the receiving station 110 (
FIG. 1 ) repeats the calculation; if the new CRC does not match the one sent (or in some cases, cancel it out) then the block contains a data error and the receivingstation 110 may take corrective action such as rereading or requesting the block be sent again. Briefly,FIG. 13 , illustrates anexemplary data packet 1300 containing sensor data (e.g., Fx, duration, location), a priority level (e.g., 1 to 10), and a CRC. - In a seventh step, the
transceiver 320 then transmits the data packet based on the priority level and operating mode. For instance, a low priority data packet can be appended with previous low-priority data packets and then transmitted over a single communication channel as a data stream, or at staggered time intervals to conserve power (e.g., scheduled to transmit every 10 seconds). The bundled packet data can then be decoded at the receivingstation 110 and thereafter processed accordingly. Alternatively, a high priority packet can be transmitted immediately instead of a delayed time or the scheduled transmit intervals. Depending on the communication mode (e.g., priority level, operating mode), the transceiver may transmit the same high priority packet multiple times in a redundant manner to guarantee receipt. This ensures that the data is received and processed at the receivingstation 110 in the event an immediate course of action or response is necessary, for example, to ensure the patient's safety or to report a warning. - The sensor data can be transmitted at the selected frequencies in the chosen mode of emission by way of the
antenna 310. In certain configurations, theantenna 310 is an integrated loop antenna designed into a substrate of thesensing module 200 for maximizing power efficiency. As an example the chosen frequencies can include, but are not limited to, ISM bands recognized in InternationalTelecommunication Union regions - The receiving station 110 (see
FIG. 1 ) 110 receives packets of data broadcast in the specified mode of emission on the specified frequencies and verifies the cyclic redundancy check checksum for individual packets of data or bundled packet data. Data that cannot be verified may be discarded. Data that are verified are forward to an external data processing device, such as an external computer, for subsequent processing, display, or storage or combination thereof. -
FIG. 7 is an illustration of a block model diagram 500 of thesensing module 200 in accordance with an exemplary embodiment. In particular, the diagram 500 shows where certain components are replaced or supplemented with one or more Application Specific Integrated Circuits (ASICs). Referring briefly toFIG. 5 ,electronic circuitry 307 is coupled to the one or more sensing assemblages and includes circuitry that can control sensor operations.Electronic circuitry 307 includes multiple channels that can operate more than one device.Sensing module 200 is optimized to operate under severe power constraints.Electronic circuitry 307 includes power management circuitry that controls power up, power down, and minimizes power usage through the control of individual blocks. The architecture is designed to enable only blocks required for the current operation. - Referring back to
FIG. 7 , the ASIC provides significant benefit in reducing power requirements allowing themodule 200 to be powered by a temporary power source such as a super capacitor or capacitor. The ASIC and super capacitor have a small formfactor allowing module 200 to be integrated within a temporary or permanent prosthetic component.Module 200 incorporates one or more sensors comprising at least one transducer and a compressible media, the operation of which is disclosed in detail herein. As shown, a sensing assemblage comprises atransducer 502,compressible propagation structure 504, and atransducer 506. It should be noted that other sensors such as MEMS devices, strain gauges, and piezo-resistive sensors can be used with the ASIC. In particular, the ASIC incorporates A/D and D/A circuitry (not shown) to digitize current and voltage output from these types of sensing components.Transducers compressible propagation structure 504. - In a non-limiting example,
transducer 506 to emits energy waves intocompressible structure 504 whiletransducer 502 detects propagated energy waves.Compressible propagation structure 504 is coupled to a load bearing or contactingsurface 508 and an encapsulatingenclosure 510 ofsensing module 200. A parameter to be measured is applied to either contactingsurface 508, encapsulatingenclosure 510, or both. In one embodiment, springs 560 couple to contactingsurface 508 and encapsulatingenclosure 510 to supportcompressible propagation structure 504. In particular, springs 560 prevent cantilevering of contactingsurface 508, reduce hysteresis caused by material properties ofcompressible propagation structure 504, and improve sensor response time to changes in the applied parameter. - In one embodiment, a first ASIC includes a charging
circuit 514 andpower management circuitry 518. Thepower management circuitry 518 couples to the charging circuit, other blocks of the ASIC and external components/circuitry to minimize power consumption of the integrated circuit. The chargingcircuit 514 operatively couples to aninduction coil 512 andenergy storage 516. In a non-limiting example,induction coil 512 couples to an external coil that provides energy to chargeenergy storage 516.Induction coil 512 and the external coil are placed in proximity to each other thereby electro-magnetically coupling to one another.Induction coil 512 is coupled toenergy storage 516.Charging circuit 514 controls the charging ofenergy storage 516.Charging circuit 514 can determine when charging is complete, monitor power available, and regulate a voltage provided to the operational circuitry.Charging circuit 514 can charge a battery insensing module 200. Alternatively, a capacitor or super capacitor can be used to power the first ASIC for a time sufficient to acquire the desired measurements. A capacitor has the benefit of a long or indefinite shelf life and fast charge time. In either charging scenario, energy from the external coil is coupled to theinduction coil 512. The energy frominduction coil 512 is then stored in a medium such as a battery or capacitor. - Benefits of ultracapacitors, ultra capacitors, or super capacitors, or other form of capacitors as a power source instead or, or in conjunction with, other power sources or rechargeable technologies include, but are not limited to, enabling a high level of miniaturization as ultracapacitors, ultra capacitors, or super capacitors are smaller than smallest available battery for the same level of energy and power for many low power applications or applications that require power only intermittently or as a short-term backup for other power sources.
- For applications that require power only intermittently, capacitors enable rapid recharge that is much faster than battery technologies and rechargeable chemistries regardless of their energy capacity. A charge time, from a completely uncharged state takes minutes because no chemical processes are involved in charging capacitors. This may be compared to charge times on the order of hours for many battery technologies that cannot be charged at a rate faster that one-half the energy storage capacity of the battery within one hour. In practice, many battery applications charge at a much slower rate. Many capacitors have the added benefit of almost indefinite lifetimes. There is no deterioration of a capacitor's storage capacity when uncharged, regardless of length of time at zero charge. Another benefit is that overcharging capacitors may pose less risk to electronics within an electronic module or device than overcharging batteries might pose. Furthermore, capacitors eliminate storage and disposal limitations of batteries with no risk of chemical leakage. In addition, capacitors can have a smaller form factor, are surface-mountable, and integrate well into the electronics assemblies and standard surface-mount electronic assembly processes.
- Use capacitors to provide operating power for wireless devices, telemetry devices, or medical devices provides design, construction, and operating flexibility over a wide range of potential applications. Capacitors can be charged by connecting them to other power sources such as, but not limited to, a battery or batteries, an alternating current (AC) power supply, a radio frequency (RF) receiver, or an electromagnetic induction coil or coils, a photoelectric cell or cells, a thermocouple or thermocouples, capacitors, or an ultrasound transducer or transducers. For compact electronic modules or devices, ultracapacitors, super capacitors, or other form of capacitors provide many benefits over other rechargeable technologies.
- The first ASIC further includes circuitry to operate and capture data from the sensing assemblages. A parameter to be measured is applied to
compressible propagation structure 504. As an example of parameter measurement, a force, pressure, or load is applied across contactingsurface 508 and encapsulatingenclosure 510. The force, pressure, or load affects the length of thecompressible propagation structure 504. The circuitry on the first ASIC forms a positive closed loop feedback circuit that maintains the emission, propagation, and detection of energy waves in thecompressible propagation structure 504. The first ASIC operatively couples totransducers compressible propagation structure 504. The energy waves emitted intocompressible propagation structure 504 can be continuous or pulsed. The energy waves can propagate by a direct path or be reflected. - The first ASIC comprises an
oscillator 520, aswitch 522,driver 524,matching network 526,MUX 528, andcontrol circuit 536. Theoscillator 520 is used as a reference clock for the ASIC and enables the PTO to begin emission of energy waves into thecompressible propagation structure 504.Oscillator 520 in the first ASIC can be coupled to an external component such as a crystal oscillator to define and provide a stable frequency of operation. Switch 522 couples theoscillator 520 toMUX 528.Control circuit 536 operatively enablesMUX 528 and switch 522 tocouple oscillator 520 todriver 524 during a startup sequence.Driver 524 andmatching network 526 couple totransducer 506.Driver 524 drivestransducer 506 to emit an energy wave.Matching network 526impedance matches driver 524 to thetransducer 506 to reduce power consumption during energy wave emission. - In one embodiment,
transducer 506 emits one or more energy waves into thecompressible propagation structure 504 at a first location.Transducer 506 is located at a second location ofcompressible propagation structure 504.Transducer 506 detects propagated energy waves at the second location and generates a signal corresponding to the propagated energy waves. The first ASIC further comprises aMUX 530, pre-amplifier 532 (e.g. preamp 532) and a zero-crossing receiver or edge detect receiver. Zero-crossing receiver or edge-detect receiver comprise detectcircuit 534.Control circuit 536 enablesMUX 530 tocouple transducer 502 topreamp 532.Preamp 532 amplifies a signal output bytransducer 502 corresponding to a propagated energy wave. In a non-limiting example, the first ASIC comprises both a zero-crossing receiver and an edge detect receiver. More multiplexing circuitry in conjunction withcontrol circuit 536 can be incorporated on the first ASIC to select between the circuits. Similarly, multiplexing circuitry can be used to couple and operate more than one sensor. The amplified signal frompreamp 532 is coupled todetection circuit 534. Zero-crossing receiver is a detection circuit that identifies a propagated energy wave by sensing a transition of the signal. A requirement of detection can be that the signal has certain transition and magnitude characteristics. The edge-detect receiver detects a propagated energy wave by identifying a wave front of the propagated energy wave. The zero-crossing receiver or edge-detect receiver outputs a pulse in response to the detection of a propagated energy wave. - Positive closed loop feedback is applied upon detection of an energy wave after the startup sequence.
Control circuit 536 decouplesoscillator 520 fromdriver 524 throughswitch 522 andMUX 528.Control circuit 536 operatively enablesswitch 558 andMUX 528 tocouple detection circuit 534 todriver 524. A pulse generated bydetection circuit 534 initiates the emission of a new energy wave intocompressible propagation structure 504. The pulse fromdetection circuit 534 is provided todriver 524. The positive closed loop feedback of the circuitry maintains the emission, propagation, and detection of energy waves inpropagation structure 504. - The first ASIC further comprises a
loop counter 538,time counter 540, register 542, andADC 556.Loop counter 538,time counter 540, and register 542 are operatively coupled to controlcircuit 536 to generate a precise measurement of the transit time, frequency, or phase of propagated energy waves during a measurement sequence. In one embodiment, a measurement comprises a predetermined number of energy waves propagating through thecompressible propagation structure 504. The predetermined number is set in theloop counter 538. Theloop counter 538 is decremented by each pulse output bydetection circuit 534 that corresponds to a detected propagated energy wave. The positive closed loop feedback is broken when counter 538 decrements to zero thereby stopping the measurement.Time counter 540 measures a total propagation time of the predetermined number of propagated energy waves set inloop counter 538. The measured total propagation time divided by the predetermined number of propagated energy waves is a measured transit time of an energy wave. The measured transit time can be precisely converted to a length ofcompressible propagation structure 504 under a stable condition of the applied parameter on the sensing assemblage. The applied parameter value can be calculated by known relationship between the length ofcompressible propagation structure 504 and the parameter. A result of the measurement is stored inregister 542 whenloop counter 538 decrements to zero. More than one measurement can be performed and stored. In one embodiment, the precision can be increased by raising the number of propagated energy waves being measured inloop counter 538. - In the example, energy waves are propagated from
transducer 506 totransducer 5. Alternatively,control circuit 536 can direct the propagation of energy waves fromtransducer 502 totransducer 506 wherebytransducer 502 emits energy waves andtransducer 506 detects propagated energy waves. An analog to digital converter (ADC) 556 is shown coupled to anaccelerometer 554.ADC 556 is a circuit on the first ASIC. It can be used to digitize an output from a circuit such asaccelerometer 554.Accelerometer 554 can be used to detect and measure when sensingmodule 200 is in motion. Data fromaccelerometer 554 can be used to correct the measured result to account formodule 200 acceleration.ADC 556 can also be used to provide measurement data from other sensor types by providing a digitized output corresponding to voltage or current magnitude. - A second ASIC can comprise CRC circuit 546,
telemetry transmitter 548, andmatching network 508. The CRC circuit 546 applies error code detection on the packet data such as data stored inregister 542. The cyclic redundancy check computes a checksum for a data stream or packet of any length. The checksums are used to detect interference or accidental alteration of data during transmission.Transmitter 548 is coupled to CRC 546 and sends the data wirelessly.Matching network 550 couples telemetrytransmitter 512 toantenna 552 to provide an impedance match to efficiently transfer the signal to theantenna 552. As disclosed above, the integration of the telemetry transmitter and sensor modules enables construction of a wide range of sizes of thesensing module 200. This facilitates capturing data, measuring parameters of interest and digitizing that data, and subsequently communicating that data to external equipment with minimal disturbance to the operation of the body, instrument, appliance, vehicle, equipment, or physical system for a wide range of applications. Moreover, the level of accuracy and resolution achieved by the total integration of communication components, transducers, waveguides, and oscillators to control the operating frequency of the ultrasound transducers enables the compact, self-contained measurement module construction. In a further embodiment, the circuitry on the first and second ASICs can be combined on a single ASIC to further reduce form factor, power, and cost. -
FIG. 8 is anexemplary assemblage 800 that illustrates propagation of ultrasound waves 810 within thewaveguide 806 in the bi-directional mode of operation of this assemblage. In this mode, the selection of the roles of the two individual ultrasound resonators (802, 804) or transducers affixed to interfacingmaterial waveguide 806 can be measured. This can enable adjustment for Doppler effects in applications where thesensing module 808 is operating while inmotion 816. Furthermore, this mode of operation helps assure accurate measurement of the applied load, force, pressure, or displacement by capturing data for computing adjustments to offset thisexternal motion 816. An advantage is provided in situations wherein the body, instrument, appliance, vehicle, equipment, or otherphysical system 814, is itself operating or moving during sensing of load, pressure, or displacement. Similarly, the capability can also correct in situation where the body, instrument, appliance, vehicle, equipment, or other physical system, is causing theportion 812 of the body, instrument, appliance, vehicle, equipment, or other physical system being measured to be inmotion 816 during sensing of load, force, pressure, or displacement. Other adjustments to the measurement for physical changes tosystem 814 are contemplated and can be compensated for in a similar fashion. For example, temperature ofsystem 814 can be measured and a lookup table or equation having a relationship of temperature versus transit time can be used to normalize measurements. Differential measurement techniques can also be used to cancel many types of common factors as is known in the art. - The use of
waveguide 806 enables the construction of low cost sensing modules and devices over a wide range of sizes, including highly compact sensing modules, disposable modules for bio-medical applications, and devices, using standard components and manufacturing processes. The flexibility to construct sensing modules and devices with very high levels of measurement accuracy, repeatability, and resolution that can scale over a wide range of sizes enables sensing modules and devices to the tailored to fit and collect data on the physical parameter or parameters of interest for a wide range of medical and non-medical applications. - Referring back to
FIG. 2 , although not explicitly illustrated, it should be noted that the loadinsert sensing device 100 and associated internal components move in accordance with motion of thefemur 108 as shown. The bi-directional operating mode of the waveguide mitigates the Doppler effects resulting from the motion. As previously indicated, incorporating data from theaccelerometer 121 with data from the other components of thesensing module 200 helps assure accurate measurement of the applied load, force, pressure, displacement, density, localized temperature, or viscosity by enabling computation of adjustments to offset this external motion. - For example, sensing modules or devices may be placed on or within, or attached or affixed to or within, a wide range of physical systems including, but not limited to instruments, appliances, vehicles, equipments, or other physical systems as well as animal and human bodies, for sensing the parameter or parameters of interest in real time without disturbing the operation of the body, instrument, appliance, vehicle, equipment, or physical system.
- In addition to non-medical applications, examples of a wide range of potential medical applications may include, but are not limited to, implantable devices, modules within implantable devices, modules or devices within intra-operative implants or trial inserts, modules within inserted or ingested devices, modules within wearable devices, modules within handheld devices, modules within instruments, appliances, equipment, or accessories of all of these, or disposables within implants, trial inserts, inserted or ingested devices, wearable devices, handheld devices, instruments, appliances, equipment, or accessories to these devices, instruments, appliances, or equipment. Many physiological parameters within animal or human bodies may be measured including, but not limited to, loading within individual joints, bone density, movement, various parameters of interstitial fluids including, but not limited to, viscosity, pressure, and localized temperature with applications throughout the vascular, lymph, respiratory, and digestive systems, as well as within or affecting muscles, bones, joints, and soft tissue areas. For example, orthopedic applications may include, but are not limited to, load bearing prosthetic components, or provisional or trial prosthetic components for, but not limited to, surgical procedures for knees, hips, shoulders, elbows, wrists, ankles, and spines; any other orthopedic or musculoskeletal implant, or any combination of these.
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FIG. 9 is an exemplary cross-sectional view of asensor element 900 to illustrate changes in the propagation of ultrasound waves 914 with changes in the length of awaveguide 906. In general, the measurement of a parameter is achieved by relating displacement to the parameter. In one embodiment, the displacement required over the entire measurement range is measured in microns. For example, anexternal force 908 compresses waveguide 906 thereby changing the length ofwaveguide 906. Sensing circuitry (not shown) measures propagation characteristics of ultrasonic signals in thewaveguide 906 to determine the change in the length of thewaveguide 906. These changes in length change in direct proportion to the parameters of interest thus enabling the conversion of changes in the parameter or parameters of interest into electrical signals. - As previously discussed, external forces applied to the
sensing module 200 compress the waveguide(s) thereby changing the length of the waveguide(s). Thesensing module 200 measures propagation characteristics of ultrasonic signals in the waveguide(s) to determine the change in the length of the waveguide(s). These changes in length change in direct proportion to the parameters of interest thus enabling the conversion of changes in the parameter or parameters of interest into load (or force) information. - As illustrated,
external force 908 compresses waveguide 906 and pushes thetransducers distance 910. This changes the length ofwaveguide 906 bydistance 912 of the waveguide propagation path betweentransducers waveguide 906 by analyzing characteristics of the propagation of ultrasound waves within the waveguide. - One interpretation of
FIG. 9 illustrates waves emitting fromtransducer 902 at one end ofwaveguide 906 and propagating totransducer 904 at the other end of thewaveguide 906. The interpretation includes the effect of movement ofwaveguide 906 and thus the velocity of waves propagating within waveguide 906 (without changing shape or width of individual waves) and therefore the transit time betweentransducers - Changes in the parameter or parameters of interest are measured by measuring changes in the transit time of energy pulses or waves within the propagating medium. Closed loop measurement of changes in the parameter or parameters of interest is achieved by modulating the repetition rate of energy pulses or the frequency of energy waves as a function of the propagation characteristics of the elastic energy propagating structure.
- In a continuous wave mode of operation, a phase detector (not shown) evaluates the frequency and changes in the frequency of resonant ultrasonic waves in the
waveguide 906. As will be described below, positive feedback closed-loop circuit operation in continuous wave (CW) mode adjusts the frequency ofultrasonic waves 914 in thewaveguide 906 to maintain a same number or integer number of periods of ultrasonic waves in thewaveguide 906. The CW operation persists as long as the rate of change of the length of the waveguide is not so rapid that changes of more than a quarter wavelength occur before the frequency of the propagation tuned oscillator (PTO) can respond. This restriction exemplifies one advantageous difference between the performance of a PTO and a Phase Locked Loop (PLL). Assuming the transducers are producing ultrasonic waves, for example, at 2.4 MHz, the wavelength in air, assuming a velocity of 343 microns per microsecond, is about 143μ, although the wavelength within a waveguide may be longer than in unrestricted air. - In a pulse mode of operation, the phase detector measures a time of flight (TOF) between when an ultrasonic pulse is transmitted by
transducer 902 and received attransducer 904. The time of flight determines the length of the waveguide propagating path, and accordingly reveals the change in length of thewaveguide 906. In another arrangement, differential time of flight measurements (or phase differences) can be used to determine the change in length of thewaveguide 906. A pulse consists of a pulse of one or more waves. The waves may have equal amplitude and frequency (square wave pulse) or they may have different amplitudes, for example, decaying amplitude (trapezoidal pulse) or some other complex waveform. The PTO is holding the phase of the leading edge of the pulses propagating through the waveguide constant. In pulse mode operation the PTO detects the leading edge of with an edge-detect receiver rather than a zero-crossing or transition as detected by a zero-crossing receiver used in CW mode. - It should be noted that ultrasound energy pulses or waves, the emission of ultrasound pulses or waves by ultrasound resonators or transducers, transmitted through ultrasound waveguides, and detected by ultrasound resonators or transducers are used merely as examples of energy pulses, waves, and propagation structures and media. Other embodiments herein contemplated can utilize other wave forms, such as, light.
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FIG. 10 is an exemplary block diagram 1000 of a propagation tuned oscillator (PTO) 4 to maintain positive closed-loop feedback in accordance with an exemplary embodiment. The measurement system includes asensing assemblage 1 and propagation tuned oscillator (PTO) 4 that detectsenergy waves 2 in one ormore waveguides 3 of thesensing assemblage 1. In one embodiment,energy waves 2 are ultrasound waves. Apulse 11 is generated in response to the detection ofenergy waves 2 to initiate a propagation of a new energy wave inwaveguide 3. It should be noted that ultrasound energy pulses or waves, the emission of ultrasound pulses or waves by ultrasound resonators or transducers, transmitted through ultrasound waveguides, and detected by ultrasound resonators or transducers are used merely as examples of energy pulses, waves, and propagation structures and media. Other embodiments herein contemplated can utilize other wave forms, such as, light. - Recall that the
sensing insert device 100 when in motion measures forces on the sensing assemblies by evaluating propagation times of energy waves within the waveguides in conjunction with the accelerometer data. The propagation tuned oscillator (PTO) 4 measures a transit time ofultrasound waves 2 within thewaveguide 3 in a closed-loop configuration. Thedigital counter 20 determines the physical change in the length of the waveguide. Referring toFIG. 5 , the one ormore accelerometers 302 determines the changes along x, y and z dimensions. Theelectronic circuitry 307 in view of the accelerometer data fromaccelerometer 302 and the physical changes in length of thesensing assemblage 1 determines the applied loading (or forces). - The
sensing assemblage 1 comprisestransducer 5,transducer 6, and a waveguide 3 (or energy propagating structure). In a non-limiting example, sensingassemblage 1 is affixed to load bearing or contactingsurfaces 8. External forces applied to the contactingsurfaces 8 compress thewaveguide 3 and change the length of thewaveguide 3. Under compression,transducers transit time 7 ofenergy waves 2 transmitted and received betweentransducers oscillator 4 in response to these physical changes will detect each energy wave sooner (e.g. shorter transit time) and initiate the propagation of new energy waves associated with the shorter transit time. As will be explained below, this is accomplished by way ofPTO 4 in conjunction with thepulse generator 10, themode control 12, and thephase detector 14. - Notably, changes in the waveguide 3 (energy propagating structure or structures) alter the propagation properties of the medium of propagation (e.g. transit time 7). The energy wave can be a continuous wave or a pulsed energy wave. A pulsed energy wave approach reduces power dissipation allowing for a temporary power source such as a battery or capacitor to power the system during the course of operation. In at least one exemplary embodiment, a continuous wave energy wave or a pulsed energy wave is provided by
transducer 5 to a first surface ofwaveguide 3.Transducer 5 generatesenergy waves 2 that are coupled intowaveguide 3. In a non-limiting example,transducer 5 is a piezo-electric device capable of transmitting and receiving acoustic signals in the ultrasonic frequency range. -
Transducer 6 is coupled to a second surface ofwaveguide 3 to receive the propagated pulsed signal and generates a corresponding electrical signal. The electrical signal output bytransducer 6 is coupled tophase detector 14. In general,phase detector 14 compares the timing of a selected point on the waveform of the detected energy wave with respect to the timing of the same point on the waveform of other propagated energy waves. In a first embodiment,phase detector 14 can be a zero-crossing receiver. In a second embodiment,phase detector 14 can be an edge-detect receiver. In the example wheresensing assemblage 1 is compressed, the detection of the propagatedenergy waves 2 occurs earlier (due to the length/distance reduction of waveguide 3) than a signal prior to external forces being applied to contacting surfaces.Pulse generator 10 generates a new pulse in response to detection of the propagatedenergy waves 2 byphase detector 14. The new pulse is provided totransducer 5 to initiate a new energy wave sequence. Thus, each energy wave sequence is an individual event of energy wave propagation, energy wave detection, and energy wave emission that maintainsenergy waves 2 propagating inwaveguide 3. - The
transit time 7 of a propagated energy wave is the time it takes an energy wave to propagate from the first surface ofwaveguide 3 to the second surface. There is delay associated with each circuit described above. Typically, the total delay of the circuitry is significantly less than the propagation time of an energy wave throughwaveguide 3. In addition, under equilibrium conditions variations in circuit delay are minimal. Multiple pulse to pulse timings can be used to generate an average time period when change in external forces occur relatively slowly in relation to the pulsed signal propagation time such as in a physiologic or mechanical system. Thedigital counter 20 in conjunction with electronic components counts the number of propagated energy waves to determine a corresponding change in the length of thewaveguide 3. These changes in length change in direct proportion to the external force thus enabling the conversion of changes in parameter or parameters of interest into electrical signals. - The block diagram 1000 further includes counting and timing circuitry. More specifically, the timing, counting, and clock circuitry comprises a
digital counter 20, adigital timer 22, adigital clock 24, and adata register 26. Thedigital clock 24 provides a clock signal todigital counter 20 anddigital timer 22 during a measurement sequence. Thedigital counter 20 is coupled to the propagation tunedoscillator 4.Digital timer 22 is coupled to data register 26.Digital timer 20, digital timer, 22,digital clock 24 and data register 26capture transit time 7 ofenergy waves 2 emitted by ultrasound resonator ortransducer 5, propagated throughwaveguide 3, and detected by or ultrasound resonator ortransducer surfaces 8. The operation of the timing and counting circuitry is disclosed in more detail hereinbelow. - The measurement data can be analyzed to achieve accurate, repeatable, high precision and high resolution measurements. This method enables the setting of the level of precision or resolution of captured data to optimize trade-offs between measurement resolution versus frequency, including the bandwidth of the sensing and data processing operations, thus enabling a sensing module or device to operate at its optimal operating point without compromising resolution of the measurements. This is achieved by the accumulation of multiple cycles of excitation and transit time instead of averaging transit time of multiple individual excitation and transit cycles. The result is accurate, repeatable, high precision and high resolution measurements of parameters of interest in physical systems.
- In at least one exemplary embodiment, propagation tuned
oscillator 4 in conjunction with one ormore sensing assemblages 1 are used to take measurements on a muscular-skeletal system. In a non-limiting example, sensingassemblage 1 is placed between a femoral prosthetic component and tibial prosthetic component to provide measured load information that aids in the installation of an artificial knee joint.Sensing assemblage 1 can also be a permanent component or a muscular-skeletal joint or artificial muscular-skeletal joint to monitor joint function. The measurements can be made in extension and in flexion. In the example,assemblage 1 is used to measure the condyle loading to determine if it falls within a predetermined range and location. Based on the measurement, the surgeon can select the thickness of the insert such that the measured loading and incidence with the final insert in place will fall within the predetermined range. Soft tissue tensioning can be used by a surgeon to further optimize the force or pressure. Similarly, twoassemblages 1 can be used to measure both condyles simultaneously or multiplexed. The difference in loading (e.g. balance) between condyles can be measured. Soft tissue tensioning can be used to reduce the force on the condyle having the higher measured loading to reduce the measured pressure difference between condyles. - One method of operation holds the number of energy waves propagating through
waveguide 3 as a constant integer number. A time period of an energy wave corresponds to energy wave periodicity. A stable time period is one in which the time period changes very little over a number of energy waves. This occurs when conditions that affectsensing assemblage 1 stay consistent or constant. Holding the number of energy waves propagating throughwaveguide 3 to an integer number is a constraint that forces a change in the time between pulses when the length ofwaveguide 3 changes. The resulting change in time period of each energy wave corresponds to a change in aggregate energy wave time period that is captured usingdigital counter 20 as a measurement of changes in external forces or conditions applied to contactingsurfaces 8. - A further method of operation according to one embodiment is described hereinbelow for
energy waves 2 propagating fromtransducer 5 and received bytransducer 6. In at least one exemplary embodiment,energy waves 2 is an ultrasonic energy wave.Transducers transducer 6 and received bytransducer 5. Furthermore, detectingultrasound resonator transducer 6 can be a separate ultrasound resonator as shown ortransducer 5 can be used solely depending on the selected mode of propagation (e.g. reflective sensing). Changes in external forces or conditions applied to contactingsurfaces 8 affect the propagation characteristics ofwaveguide 3 and altertransit time 7. As mentioned previously, propagation tunedoscillator 4 holds constant an integer number ofenergy waves 2 propagating through waveguide 3 (e.g. an integer number of pulsed energy wave time periods) thereby controlling the repetition rate. As noted above, oncePTO 4 stabilizes, thedigital counter 20 digitizes the repetition rate of pulsed energy waves, for example, by way of edge-detection, as will be explained hereinbelow in more detail. - In an alternate embodiment, the repetition rate of
pulsed energy waves 2 emitted bytransducer 5 can be controlled bypulse generator 10. The operation remains similar where the parameter to be measured corresponds to the measurement of thetransit time 7 ofpulsed energy waves 2 withinwaveguide 3. It should be noted that an individual ultrasonic pulse can comprise one or more energy waves with a damping wave shape. The energy wave shape is determined by the electrical and mechanical parameters ofpulse generator 10, interface material or materials, where required, and ultrasound resonator ortransducer 5. The frequency of the energy waves within individual pulses is determined by the response of the emittingultrasound resonator 4 to excitation by anelectrical pulse 11. The mode of the propagation of thepulsed energy waves 2 throughwaveguide 3 is controlled by mode control circuitry 12 (e.g., reflectance or uni-directional). The detecting ultrasound resonator or transducer may either be a separate ultrasound resonator ortransducer 6 or the emitting resonator ortransducer 5 depending on the selected mode of propagation (reflectance or unidirectional). - In general, accurate measurement of physical parameters is achieved at an equilibrium point having the property that an integer number of pulses are propagating through the energy propagating structure at any point in time. Measurement of changes in the “time-of-flight” or transit time of ultrasound energy waves within a waveguide of known length can be achieved by modulating the repetition rate of the ultrasound energy waves as a function of changes in distance or velocity through the medium of propagation, or a combination of changes in distance and velocity, caused by changes in the parameter or parameters of interest.
- It should be noted that ultrasound energy pulses or waves, the emission of ultrasound pulses or waves by ultrasound resonators or transducers, transmitted through ultrasound waveguides, and detected by ultrasound resonators or transducers are used merely as examples of energy pulses, waves, and propagation structures and media. Other embodiments herein contemplated can utilize other wave forms, such as, light. Furthermore, the velocity of ultrasound waves within a medium may be higher than in air. With the present dimensions of the initial embodiment of a propagation tuned oscillator the waveguide is approximately three wavelengths long at the frequency of operation.
- Measurement by propagation tuned
oscillator 4 andsensing assemblage 1 enables high sensitivity and high signal-to-noise ratio. The time-based measurements are largely insensitive to most sources of error that may influence voltage or current driven sensing methods and devices. The resulting changes in the transit time of operation correspond to frequency, which can be measured rapidly, and with high resolution. This achieves the required measurement accuracy and precision thus capturing changes in the physical parameters of interest and enabling analysis of their dynamic and static behavior. - These measurements may be implemented with an integrated wireless sensing module or device having an encapsulating structure that supports sensors and load bearing or contacting surfaces and an electronic assemblage that integrates a power supply, sensing elements, energy transducer or transducers and elastic energy propagating structure or structures, biasing spring or springs or other form of elastic members, an accelerometer, antennas and electronic circuitry that processes measurement data as well as controls all operations of ultrasound generation, propagation, and detection and wireless communications. The electronics assemblage also supports testability and calibration features that assure the quality, accuracy, and reliability of the completed wireless sensing module or device.
- In general, measurement of the changes in the physical length of individual waveguides can be made in several modes. Each assemblage of one or two ultrasound resonators or transducers combined with a waveguide can be controlled to operate in six different modes. This includes two wave shape modes: continuous wave or pulsed waves, and three propagation modes: reflectance, unidirectional, and bi-directional propagation of the ultrasound wave. In all modes of operation the changes in transit time within the ultrasound waveguides change the operating frequency of the propagation tuned
oscillator 4 or oscillators. These changes in the frequency of oscillation of the propagation tuned oscillator or oscillators can be measured rapidly and with high resolution. This achieves the required measurement accuracy and precision thus enabling the capture of changes in the physical parameters of interest and enabling analysis of the dynamic and static behavior of the physical system or body. - The level of accuracy and resolution achieved by the integration of energy transducers and an energy propagating structure or structures coupled with the electronic components of the propagation tuned oscillator enables the construction of, but is not limited to, compact ultra low power modules or devices for monitoring or measuring the parameters of interest. The flexibility to construct sensing modules or devices over a wide range of sizes enables sensing modules to be tailored to fit a wide range of applications such that the sensing module or device may be engaged with, or placed, attached, or affixed to, on, or within a body, instrument, appliance, vehicle, equipment, or other physical system and monitor or collect data on physical parameters of interest without disturbing the operation of the body, instrument, appliance, vehicle, equipment, or physical system.
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FIG. 11 is a cross-sectional view of a layout architecture of thesensing module 200 in accordance with an exemplary embodiment. The blocks are operatively coupled within the encapsulated enclosure of thesensing module 200 and together form an encapsulatedforce sensor 1100. It comprises atop steel plate 1104 coupled to a lower printed circuit board (PCB) 1118 by way ofspring retainer 1106,disc spring 1108, andspring post 1114. Theforce sensor 1100 is biased with springs or other means of elastic support to accurately maintain a required distance between the load bearing or contact surfaces such astop cover 1102 and to minimize hysteresis due to material properties ofwaveguide 1110. - The encapsulating
force sensor 1100 supports and protects the specialized mechanical and electronic components from external physical, mechanical, chemical, and electrical, and electromagnetic intrusion that might compromise sensing or communication operations of the module or device. The encapsulatingforce sensor 1100 also supports internal mechanical and electronic components and minimizes adverse physical, mechanical, electrical, and ultrasonic interactions that might compromise sensing or communication operations of the module or device.Top cover 1102 and unitarymain body 1157 form the encapsulating enclosure. Unitarymain body 1157 is a metal, plastic, or polymer body having sufficient strength and rigidity to withstand forces, pressures, and loads of the muscular-skeletal system. In particular, the sidewalls or bottom surface do not deform under normal operating conditions. For example, the unitarymain body 1157 can be formed of polycarbonate or other biocompatible material. Moreover, unitarymain body 1157 can be molded in a manufacturing process that allows detailed features to be repeatably and reliably manufactured. - The physical layout architecture of
sensor 1100 has the one or more sensing assemblages overlying the electronic circuitry. A force, pressure, or load is applied to a surface ofsensor 1100. The surface ofsensor 1100 corresponds totop steel plate 1104.Steel plate 1104 moves in response to a force, pressure, or load. Thesteel plate 1104 can support the movement while maintaining a seal with unitarymain body 1157 that isolates an interior of the enclosure. In general, a sensing assemblage is coupled betweensteel plate 1104 and asubstrate 1130.Substrate 1130 is a rigid non-moveable substrate that is supported by the sidewalls of unitarymain body 1157. A periphery ofsubstrate 1130 is in contact with and supported by asupport feature 1128 formed in the sidewalls of unitarymain body 1157.Substrate 1130 does not flex under loading. The sensing assemblage translates a displacement due to the force, pressure, or load applied tosteel plate 1104 to a signal. The signal is processed by electronic circuitry in the enclosure to generate data corresponding to the force, pressure, or load value. As shown, the sensing assemblage comprises upper piezo 1112,waveguide 1110, and lower piezo 1124. Upper piezo 1112 and lower piezo 1124 are ultrasonic piezo-electric transducers. - Electronic circuitry to power, control, interface, operate, measure, and send sensor data is interconnected together on a printed circuit board (PCB) 1118. One or
more cups 1120 are formed in unitarymain body 1157. In one embodiment, the components mounted onPCB 1118 reside withincups 1120. One ormore structures 1126 support and fix the position of thePCB 1118. The components onPCB 1118 are suspended in thecups 1120 and do not have contact with unitarymain body 1157 thereby preventing interconnect stress that could result in long-term reliability issues. ThePCB 1118 is mechanically isolated fromsubstrate 1130. Thus, any force, pressure, or loading onsubstrate 1130 is not applied toPCB 1118. Flexible interconnect is used to connect from the electronic circuitry onPCB 1118 to upper piezo 1112 and lower piezo 1124. - In one embodiment, more than one sensing assemblage couples to predetermined locations of the
steel plate 1104. Each sensing assemblage can measure a parameter applied tosteel plate 1104. In combination, the sensing assemblages can determine a location or region where the parameter is applied to the surface. For example, the magnitude and position of the loading on the contacting surface ofsensing module 200 applied byfemur 102 andtibia 108 tosensing module 200 can be measured and displayed as shown inFIG. 2 . In a non-limiting example, three sensing assemblages can be spaced on a periphery ofsteel plate 1104. In the example, each sensing assemblage will measure a force applied tosteel plate 1104. The location of the applied force is closest to the sensing assemblage detecting the highest force magnitude. Conversely, the sensing assemblage detecting the weakest force magnitude is farthest from the applied force. The measured force magnitudes in combination with the predetermined locations where the sensing assemblages couple tosteel plate 1104 can be used to determine a location where the parameter is applied. - The housing electrically insulates the internal electronic, sensing, and communication components. The encapsulating
force sensor 1100 eliminates parasitic paths that might conduct ultrasonic energy and compromise excitation and detection of ultrasound waves within the sensing assemblages during sensing operations. A temporary bi-directional electrical interconnect assures a high level of electrical observation and controllability of the electronic assembly within the encapsulatingforce sensor 1100. The temporary interconnect also provides a high level of electrical observation of the sensing subsystem, including the transducers, waveguides, and mechanical spring or elastic assembly. -
Ultrasound waveguide 1110 is coupled to thetop cover 1102. A force applied to thetop cover 1102 compresseswaveguide 1110. Lower piezo 1124 and upper piezo 1112 are piezo-electric transducers respectively coupled towaveguide 1110 at a first and second location.Waveguide 1110 is a compressible propagation medium for ultrasonic energy waves. The transducers emit energy waves and detect propagated energy waves inwaveguide 1110. Electronic circuitry is coupled to lower piezo 1124 and upper piezo 1112 to measure transit time, frequency, or phase of the propagated energy waves. The transit time, frequency, or phase of energy waves propagating between the first and second locations ofwaveguide 1110 can be precisely measured and therefore the length of theultrasound waveguide 1110. The length ofwaveguide 1110 is calculated by a known function relating material properties of thewaveguide 1110 to the parameter being measured. In the example, a force, pressure, or load is calculated from the measured length ofwaveguide 1110. - The encapsulated
force sensor 1100 can accurately and repeatably measure one pound changes in load with changes in length of a waveguide comprising 2.5 microns. The maximum change in the present implementation is specified at less than 5.0 microns. This assures that the size of thesensing module 200 throughout all measurements remains within the required dimension (e.g., distance) of the insert between the load bearing surfaces of the prosthetic components. - An exemplary level of control of the compression or displacement of the
waveguides 1110 with changes in load, force, pressure, or displacement is achieved by positioning the spring or springs 1108 or other means of elastic support, including thewaveguides 1110 themselves, between the load bearing contact surfaces to minimize any tendency of the load bearing contact surfaces to cantilever. Cantilevering can compromise the accuracy of the inclination of the load bearing contact surface whenever load, force, pressure, or displacement is applied to any point near a periphery of the load bearing contact surfaces. In one embodiment, springs 1108 are disc springs. Thespring 1108 is held in a predetermined location byspring post 1114 andspring retainer 1104. - The walls of the unitary
main body 1157 include a small gap to enable thesteel plate 1104 to move. The hermetic seal is also flexible to allow thesteel plate 1104 of theforce sensor 1104 to slide up and down, like a piston, for distances on the order of a hundred microns without compromising integrity of the seal. The hermetic seal completes manufacturing, sterilization, and packaging processes without compromising ability to meet regulatory requirements for hermeticity. The level of hermeticity is sufficient to assure functionality and biocompatibility over the lifetime of the device. Implant devices with total implant time less than 24 hours may have less stringent regulatory requirements for hermeticity. Unbiased electrical circuitry is less susceptible to damage from moisture. The electronics in one embodiment are only powered during actual usage. In another embodiment, the encapsulatedforce sensor 1100 employs low duty cycles to serve as a measurement-on-demand device to efficiently perform at low total operating time when the electronics are powered on. - The encapsulating
force sensor 1100 has a compact size permitting it to fit for example within a trial insert, final insert, prosthetic component, tool, equipment, or implant structure to measure the level and incidence of the load on subsequent implanted prosthetic devices. It can be constructed using standard components and manufacturing processes. Manufacturing carriers or fixtures can be designed to emulate the final encapsulating enclosure of thesensing module 200. Calibration data can be obtained during the manufacturing processing thus enabling capture of accurate calibration data. These calibration parameters can be stored within the memory circuits integrated into the electronics assemblage of thesensing module 200. Testability and calibration further assures the quality and reliability of the encapsulated enclosure. - Examples of a wide range of potential medical applications can include, but are not limited to, implantable devices, modules within implantable devices, intra-operative implants or modules within intra-operative implants or trial inserts, modules within inserted or ingested devices, modules within wearable devices, modules within handheld devices, modules within instruments, appliances, equipment, or accessories of all of these, or disposables within implants, trial inserts, inserted or ingested devices, wearable devices, handheld devices, instruments, appliances, equipment, or accessories to these devices, instruments, appliances, or equipment.
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FIG. 12 is a simplified cross-sectional view of an embodiment of theload sensing platform 121 in accordance with an exemplary embodiment. Theload sensing platform 121 is placed, engaged, attached, or affixed to or within a physical system with a portion of the system contacting the load bearing or contacting surfaces of theload sensing platform 121. As disclosed inFIG. 1 theload sensing platform 121 can be used intra-operatively to measure parameters of the muscular-skeletal system during joint replacement surgery. In the example, theload bearing platform 121 is placed in a joint of the muscular-skeletal system to measure force, pressure, or load and the location where the force, pressure, or load is applied. The lowerload bearing surface 8 contacts thetibial component 106 of the artificial knee. The upperload bearing surface 8 contacts thefemoral component 104 of the artificial knee. Not shown are the muscles, ligaments, and tendons of the muscular-skeletal system that apply a compressive force, pressure, or load on thesurfaces 8 of theload sensing platform 121. Theload sensing platform 121 has a form factor that allows integration in tools, equipment, and implants. Theload sensing platform 121 is bio-compatible and can be placed in an implant or attached to the muscular-skeletal system to provide long term monitoring capability of natural structures or artificial components. - A compact sensing platform is miniaturized to be placed on or within a body, instrument, appliance, vehicle, equipment, or other physical system without disturbing the operation of the body, instrument, appliance, vehicle, equipment, or physical system. This facilitates contacting the sources of load, force, pressure, displacement, density, viscosity, or localized temperature to be measured. The non-limiting example of
load sensing platform 121 can include circuitry disclosed inFIG. 5 . Two or more springs or other means ofelastic support 315 support the load bearing or contactingsurfaces 8. One or more assemblages each comprised of one or two ultrasound resonators or transducers are coupled between load bearing surfaces 8. - As shown, a
single sensing assemblage 1 is centrally located inload sensing platform 121.Sensing assemblage 1 is a stack comprising theupper transducer 6, thelower transducer 5, and thewaveguide 3. In one embodiment, thewaveguide 3 is cylindrical in shape having a first end and a second end.Transducers waveguide 3. An interface material can be used to attach and enhance acoustical coupling between a transducer and waveguide. The stack is positioned in contact with, attached, or coupled to the load bearing or contactingsurfaces 8. Electrical interconnect such as a flex interconnect couples to terminals oftransducers transducers electronic circuitry 307 of thesensing module 200. - The upper
load bearing surface 8 is a surface of anupper substrate 702. An interior surface of theupper substrate 702 couples totransducer 6. Similarly, the lowerload bearing surface 8 is a surface of alower substrate 704. An interior surface of the lower substrate couples to thetransducer 5. A load, force, or pressure applied acrossload bearing surfaces 8 can compress or lengthenwaveguide 3. This arrangement facilitates translating changes in the parameter or parameters of interest into changes in the length or compression of the waveguide orwaveguides 3 and converting these changes in the length or compression of thewaveguide 3 or waveguides into electrical signals by way oftransducers sensing assemblage 1 to sense changes in the physical parameters of interest with minimal disturbance to the operation of the external body, instrument, appliance, vehicle, equipment, or physical system. To achieve the required level of miniaturization, the length of theultrasound waveguides 3 is on the order of 10 millimeters in length. The measurable resolution of compression or displacement of waveguide is on the order of sub-microns. - One or
more springs 315 or other means of elastic support, support the load bearing or contactingsurfaces 8. The one or more springs control a compression ofload sensing platform 121. For example,waveguide 3 can comprise a polymer material suitable for energy wave propagation. In one embodiment, the polymer material changes dimension when a parameter to be measured is applied towaveguide 3. A relationship is known between the polymer material and a measured dimension. Changes in dimension are measured and the parameter calculated by way of the known relationship. The polymer material can exhibit mechanical hysteresis whereby the material in-elastically responds to changes in the applied parameter. In the example, the length ofwaveguide 3 responds to the force, pressure, or load applied across contactingsurfaces 8. Moreover, the polymer material may not rebound in a timely fashion as the force, pressure or load changes.Springs 315 aid in the transition aswaveguide 3 responds to different levels of compression.Springs 315 bring theload sensing platform 121 to an accurate and repeatable quiescent state or condition. Springs further prevent the cantilevering ofload bearing surfaces 8 that can reduce an accuracy of measurement. Cantilevering becomes more prevalent as forces, pressures, and loads are applied towards the periphery of a contact area of load bearing surfaces 8. - In one embodiment, the
springs 315 that supportload bearing surfaces 8 are disc springs or a wave springs. Disc springs are capable of maintainingwaveguide 3 at a precise length. The compression of thewaveguide 3 is very accurate over the measurement range. The compression of the disc springs can be monotonic over the range of applied levels of force, pressure, or load. In one embodiment, the surfaces of the disc springs are polished to assure smooth compression with changes in force applied to contact surfaces 8. A further benefit of the disk springs is that they eliminate or minimize cantilevering of the load supporting substrate that can compromise the accuracy due to the inclination of load bearing surfaces 8. In the illustration, twosprings 315 are shown that are located on the periphery ofload sensing platform 121. Although not shown,other springs 315 may reside in theload sensing platform 121 at other predetermined locations. Typically, the contact area where the parameter is applied to load bearingsurfaces 8 is within an area bounded bysprings 315. - In one embodiment, a
substrate 706 is resides betweenupper substrate 702 andlower substrate 704.Sensing assemblage 1 couples through an opening insubstrate 706 to couple to the interior surfaces ofsubstrates substrate 702 moves as a force, pressure, or load is applied whilesubstrate 704 remains in a fixed position. Thus, a force, pressure, or load applied to contactingsurface 8 changes a distance betweensubstrates waveguide 3.Substrates Substrates -
Springs 315 are placed between an upper surface ofsubstrate 706 and the interior surface ofsubstrate 702. As disclosed in the example, springs 315 are disc springs. The disc springs are concave in shape. The disc spring are formed having a centrally located circular opening. The surface ofsprings 315 proximally located to the circular opening contacts the upper surface ofsubstrate 706. The surface ofsprings 315 proximally located to the outer edge ofsprings 315 contacts the interior surface ofsubstrate 702. A force applied across theload bearing surface 8 ofload sensing platform 121 will compresssprings 315 andwaveguide 3. The amount of compression ofwaveguide 3 over a measurable range can be very small but will provide precision accuracy of the parameter. For example,waveguide 3 may be compressed less than a millimeter for a force measurement ranging from 5 to 100 lbs. In the example, the length ofwaveguide 3 is precisely measured using acoustic energy wave propagation. The measured length is then converted to the force, pressure, or load. Thesprings 315 support movement of thewaveguide 3 upon a change in force, pressure, or loading. For example, springs 315 repeatably return theload sensing platform 121 to a precise quiescent state upon releasing an applied force. The characteristics ofsprings 315 are known over the measurement range ofload sensing platform 121. The calculated measured value of the parameter can include compensation due tosprings 315. -
Spring 315 are in a fixed location inload sensing platform 121. The disc springs are located on the periphery of theload sensing platform 121. Spring posts 708 andspring retainers 710 are used to align and fixsprings 315 in each predetermined location.Spring post 708 alignssubstrate 702 tosubstrate 706.Spring post 708 andspring retainer 710 aligns to corresponding openings insubstrate 706. In one embodiment, a cap ofpost 708 fits into a corresponding cavity of the interior surface ofsubstrate 702.Spring retainer 710 is a sleeve that overliespost 708.Post 708 andspring retainer 710 couples through a corresponding opening insubstrate 706.Spring retainer 710 has a lip that overlies and contacts the upper surface ofsubstrate 706. Thespring post 708 andspring retainer 710 couple through the opening in the disc spring. The edge of the opening rests against the edge of the lip ofretainer 710 thereby retaining and holdingspring 315 in the predetermined location.Spring 315 can move vertically allowingwaveguide 3 to change length due to the parameter being applied to contact surfaces 8. - In one embodiment,
load sensing platform 121 can locate a position where the parameter is applied on a load bearing surface. Locating the position can be achieved by using more than onesensing assemblages 1. In one embodiment, threesensing assemblages 1 couple to load bearing or contactingsurface 8 at three predetermined locations. The parameter is measured by eachsensing assemblages 1. The magnitudes of each measurement and the differences between measurements of thesensing assemblages 1 are compared. For example, the location of the applied parameter is closer to the sensing assemblage that generates the highest reading. Conversely, the location of the applied parameter will be furthest from the sensing assemblage that generates the lowest reading. The exact location can be determined by comparison of the measured values of each sensing assemblage in conjunction with knowledge of the predetermined locations where each assemblage contacts load bearing or contactingsurface 8. -
FIG. 14 is an exemplary block diagram schematic of a compact low-power energy source 1400 integrated into an exemplary electronic assembly of thesensing module 200 in accordance with one embodiment. The schematic illustrates one embodiment of thecapacitive energy storage 1400 having an induction coupling to anexternal power source 1402 to transfer energy to a super capacitor or capacitor as an energy storage device that provides operating power for sensingmodule 200. The compact low-power energy source 1400 can comprise aninduction coil 1404, arectifier 1406, aregulator 1408, a capacitiveenergy storage device 1410, apower management circuit 1412, andoperational circuitry 1414. The latter circuits can be analog or discrete components, assembled in part or whole with other electronic circuitry, custom designed as an ASIC, or any combination thereof. In one embodiment, the operational circuitry can include circuitry to operate and produce measurement data from sensing assemblages, demodulation circuitry for a wireless receive path, communication circuitry, and secure encoding circuitry. - The
external energy source 1402 can be coupled to a battery or batteries or an alternating current power supply. For example,external energy source 1402 can be an external hand-held device with its own battery that wirelessly transfers charge from the battery of the hand-held device to theenergy source 1400 of the sensing device. The surgeon or technician can hold the hand-held device in close proximity to the sensing device prior to or during orthopedic surgery to provide sufficient charge to operate the device during the procedure. The sensing device as a long-term implant can be charged by the patient at his or her own convenience to initiate a measurement process that provides information on the implant status. In other embodiments, thesensing module 200 being powered by charge fromexternal energy source 1402 can communicate a signal to indicate a recharging operation is necessary, for example, when in the proximity of a charging device. -
External energy source 1402 can be coupled wirelessly to capacitiveenergy storage device 1410 through electromagnetic induction coil orcoils 1404,rectifier 1406 andregulator 1408. The charging operation is controlled bypower management circuitry 1412. During operation ofoperating circuitry 1414, power is transferred from capacitiveenergy storage device 1410 bypower management circuitry 1412 that includes, but is not limited to, efficient step-up and step-down voltage converter circuitry that conserves operating power of circuit blocks at the minimum voltage levels that support the required level of performance. Clock frequencies are also optimized for performance, power, and size to assure digital circuit blocks operate at the optimum clock rates that support the required level of performance. Circuit components are partitioned among integrated circuits and discrete components to minimize power consumption without compromising performance. Partitioning functions between digital and analog circuit also enhances design flexibility and facilitates minimizing power consumption without sacrificing functionality or performance. - A method of powering and operation of the sensing module is disclosed below. The method can be practiced with more or less than the number of steps shown and is not limited to the order shown. To describe the method, reference will be made to the components of other figures described hereinabove although it is understood that the method can be implemented in any other manner using other suitable components. The
sensing module 200 described inFIG. 5 including capacitive energy storage capability and highly efficient, low power operating performance can be used to illustrate the operating principles of the method. The method is initiated when theexternal power source 1402 begins transmitting power within range of the induction coil orcoils 1404 of thesensing module 200. In a second step, theinduction coils 1404 are coupled to the electromagnetic waves such that the electromagnetic waves are sensed. The induction coil orcoils 1404 are energized by the power transmissions fromexternal power source 1402. In a third step, the coupled electromagnetic waves create an AC power signal in induction coil or coils 1404. In a fourth step, therectifier 1406 rectifies the AC power signal to produce a rectified power signal. In one embodiment, a voltage level across induction coil orcoils 1404 rises to a level that a rectified signal is generated by full-wave rectifier 1406. In a fifth step, the rectified power signal is used to charge or provide energy to the capacitiveenergy storage device 1410, which holds the charge. In a non-limiting example, theenergy storage device 1410 is a super capacitor or capacitor having a small form factor with enough storage capability to power thesensing module 200 for a predetermined period of time. For example, a total knee reconstruction operation takes approximately one to two hours. Capacitiveenergy storage device 1410 would store sufficient charge to power thesensing module 200 to provide measurements for this length of time. Integrating most of the circuitry on one or two low-power ASICs greatly reduces power consumption of the system making this possible. In a sixth step, thevoltage regulator 1408 ensures that the capacitiveenergy storage device 1410 is charged to, and maintains a voltage level that is greater than the required operating voltage of thesensing module 200. In a seventh step, thepower management circuitry 1412 monitors the level of charge on capacitiveenergy storage device 1410 to determine if the voltage exceeds a threshold. The threshold can correspond to a shunt threshold established by theregulator 1408. The operatingelectronics circuitry 1414 is enabled when it is determined in that an adequate level of charge has been stored to power thesensing module 200 for at least the predetermined time period. - In an eighth step, the
power management circuitry 1412 disconnects theenergy storage device 1410 from the charging circuitry (1404, 1406, and 1408) when the coupling withexternal power source 1402 is removed or terminated.Power management circuitry 1412 continues to monitor the level of charge on capacitiveenergy storage device 1410. Thepower management circuitry 1412 powers down thesensing module 200 including theoperational circuitry 1414 when the charge or voltage level falls below a predetermined threshold. Thepower management circuitry 1412 subsequently discharges remaining charge on theenergy storage device 1410 to prevent unreliable, intermittent, or erratic operation of theoperational circuitry 1414. - Under nominal conditions, a charge time from zero charge to fully charged is approximately 3 minutes. In one embodiment, the maximum charge time is specified to be no greater than 7 minutes. The charging time of a capacitor powered system is a major improvement over the two hours or more required to fully charge a battery from zero charge regardless of battery capacity. The capacitive
energy storage device 1410 can include capacitors with solid dielectrics that have longer lifetimes than batteries, can be left uncharged, and will not degrade regardless of length of time at a zero charge. In one arrangement, the wireless charging operation can be performed by electromagnetic induction before removal of any sterile packaging. The capacitiveenergy storage device 1410 is applicable for powering chronic active implantable devices where data collection is discrete point-of-time measurements rather than continuous, fulltime data collection and storage. - The compact low-power energy source can be used as a backup power source for
sensing module 200 should the primary power source be terminated. A method performed by the compact low-power energy source as a backup power source is disclosed below. The method can be practiced with more or less than the number of steps shown and is not limited to the order shown. To describe the method, reference will be made to the components ofFIGS. 1 , 5 and 14, although it is understood that the method can be implemented in any other manner using other suitable components. Themedical sensing device 100 described inFIG. 1 including capacitive energy storage capability and highly efficient, low power operating performance can be used to illustrate the operating principles of method as a back-up power source. Broadly stated, the method is directed to charging thesensing insert device 100 by way of a wired connection instead of wireless induction charging. - In a first step, the
induction coil 1404 is electrically decoupled. In a second step, therectifier 1406 and theregulator 1408 are disabled. At this juncture, the method enters a state where capacitiveenergy storage device 1410 is decoupled from the wireless charging circuits; that is, the powertransmission components inductor 1404,rectifier 1406, andregulator 1408 are disabled. As one example, an electrical switching operation disengages the connection upon thepower management circuitry 1412 detecting a direct line charge on the capacitiveenergy storage device 1410. In another arrangement, thepower management circuitry 1412 further checks whether the induction coils are energized at the time of the applied line charge, thereby indicating that the energy is being delivered via a wired connection instead, since no induction activity by anexternal power source 1402 is detected. - In a second step, the wired energy source starts and charges capacitive
energy storage device 1410. The wired energy source maintains capacitiveenergy storage device 1410 at full charge under normal operating conditions through direct electrical coupling.Power management circuitry 1412 monitors the level of charge on capacitiveenergy storage device 1410. If at a third step, power from wired energy source is interrupted,power management circuitry 1412 isolates the capacitiveenergy storage device 1410 from the wired energy source. As one example, a power interruption occurs when an individual manually disconnects the wired power source from thesensing module 200. This could also occur in response to an energy spike or power drop in the wired energy source. As another example, a power interruption could occur upon thepower management circuitry 1412 detecting the presence of anexternal power source 1402 attempting to charge thesensing module 200 and thereby competing with the wired energy source. - In a fourth step, the
power management circuitry 1412 can commence to supply the energy stored on the capacitiveenergy storage device 1410 tooperating circuitry 1414 and associated electronics for normal operation. In a fifth step,power management circuitry 1412 monitors the level of charge on capacitiveenergy storage device 1410. In a sixth step, thepower management circuitry 1412 will allow the continued supply of energy to theoperating circuitry 1414 as long as the voltage oncapacitor 1410 exceeds a voltage threshold. In a seventh step, thepower management circuitry 1412 powers down the electronic assembly when the charge or voltage level falls below the predetermined charge of voltage threshold. The threshold is chosen to provide sufficient time to power down theoperational circuitry 1414 in an orderly fashion. - If the wired energy source is restored,
power management circuitry 1412 resumes the direct connection of power between the wired energy source andoperational circuitry 1414.Power management circuitry 1412 also resumes the coupling of power between the wired energy source and capacitiveenergy storage device 1410 and resumes maintaining it at full charge. - A method is disclosed for wireless modulation telemetry in accordance with one embodiment. The method can be practiced with more or less than the number of steps shown and is not limited to the order shown. To describe the method, reference will be made to the components of
FIGS. 1 , 5 and 14, although it is understood that the method can be implemented in any other manner using other suitable components. - In a first step, the external
wireless energy source 125 acquires input data. As one example, the user can manually enter the input data via a touchscreen or a user interface menu on the externalwireless energy source 125. In another arrangement, the input data in response to a user directive can be communicatively uploaded to the externalwireless energy source 125, for example, by USB or via a wi-fi connection. The input data can be information such as a serial number, a registration code, biasing parameters (e.g., spring constants, load balancing), updated parameters, version control information, security code information, data log tags, operational control information, or any other data. More specifically, data and instructions to be transmitted to thesensing insert device 100 is input into adata input port 128 of externalwireless energy source 125. - As one example, referring back briefly to
FIG. 1 , thereceiver station 110 can query a serial number from thesensing insert device 100 for updating medical records and inventory.Sensing insert device 100 includes thesensing module 200. As another example, the externalwireless energy source 125 can download an operation code for adjusting a bias level of one of the springs in thesensing assemblies 303, or establishing an operating mode (e.g., standby, debug, flash). Following the acquisition of input data, the externalwireless energy source 125 can be placed in the proximity of the loadinsert sensing device 100. At this point, operation of an external charging device orwireless energy source 1402 is initiated and contact is established withinsert sensing device 100. - In a second step, the external
wireless energy source 125 proceeds with secure encoding of the input data. As one example, the externalwireless energy source 125 by way of a processor embeds cyclic redundancy check (CRC) bits into a data communication packet representing the input data. The CRC is computed and included in the transmission of each data packet. The cyclic redundancy check is based on an algorithm that computes a checksum for a data stream or packets of any length. These checksums can be used to detect interference or accidental alteration of data during transmission. Cyclic redundancy checks are good at detecting errors caused by electrical or electromagnetic noise and therefore enable robust protection against improper processing of corrupted data encoded in energy streams having communication of instructions and data as a secondary function. - In a third step, the external
wireless energy source 125 modulates the input data onto a TX (transmit) power signal. For instance, themodulation circuit 127 modulates the power signal as a carrier signal and conveys the input data by adjusting at least one of an amplitude, phase, or frequency of the power signal. In the case of wireless energy transfer by resonant induction, the externalwireless energy source 125 can modulate the resonant frequency over a small bandwidth to convey the input data in a power efficient manner. In yet another arrangement, timing intervals between energy emissions can be used to convey input data. In a fourth step, the externalwireless energy source 125 transmits the TX power signal to thesensing insert device 100. - In a fifth step, the
sensing insert device 100 senses the electromagnetic energy waves on the induction coils. In a sixth step, a RX power signal is generated from the received electromagnetic waves. This RX power signal comprises a power signal to provide charge to power to thesensing insert device 100 and a communication signal. As previously discussed, the compact low-power energy source 1400 by way of theinduction coils 1404,rectifier 1406, andregulator 1408 sense and convert electromagnetic waves to a rectified voltage signal that is then used to charge a super capacitor or capacitor. In one configuration, the externalwireless energy source 125 and the compact low-power energy source 1400 employ resonant inductive coupling to provide power efficient transmission over short distances (e.g., less than 20 cm). As an example, the inductors (coils) in conjunction with closely spaced capacitor plates are tuned to a mutual resonant frequency to minimize power loss. The externalwireless energy source 125 modulates the power signal around the resonant frequency to transmit power efficiently while simultaneously conveying the communication signal. - In a seventh step, the
sensing insert device 100 demodulates the communication signal from the RX power signal. The demodulation extracts the information or data from the modulated carrier wave. The demodulation circuit can be in one of therectifier 1406,regulator 1408,power management circuitry 1412, oroperational circuitry 1412. In an eight step, thesensing insert device 100 securely decodes and validates the information or data. In one embodiment, a cyclic redundancy check checksum is performed to verify the data was not corrupted or received incorrectly. The data is forwarded to control andprocessing circuitry 307. In the example,electronic circuitry 307 is on an ASIC integrated circuit with the communication blocks to perform the demodulation, CRC, encoding/decoding, and data validation. As an example, the circuitry can include envelope detectors, phase detectors, oscillators, multipliers, adders, filters, and logic operators. - The
sensing insert device 100 can then proceed to use the decoded down-link data, for example, to control at least one operation, as shown in a ninth step. As an example, the control operation can place thesensing insert device 100 in a particular operation mode, such as, stand-by or low-power. As another example, the control operation can download a serial number to a local memory on thesensing insert device 100. The serial number can later be transmitted upon request to a communicatively coupledreceiver station 110. - Methods are disclosed hereinbelow for power conservation in accordance with one or more embodiments. The methods can be practiced with more or less than the number of steps shown and is not limited to the order shown. To describe the method, reference will be made to the components of
FIGS. 1 , 5 and 14, although it is understood that the method can be implemented in any other manner using other suitable components. In general, asensing module 200 is coupled to the muscular-skeletal system. Thesensing module 200 is used intra-operatively to measure one or more parameters of the muscular-skeletal system to aid in the installation of prosthetic components. In the example disclosed above, thesensing module 200 is placed in a trial insert that dimensionally is substantially equal to the dimensions of a final insert. The trial insert is used in conjunction with other final or permanent prosthetic components to determine fit, function, and allowing modification to fine tune the installation before the final insert is inserted. Similarly, one or more of the final prosthetic components can includesensing module 200. The disclosed example has thesensing module 200 in the final insert. Thesensing modules 200 in the final prosthetic components can measure different parameters than the trial insert. For example, pain, infection, joint kinematics, and bearing surface wear are post-operative parameters of interest. - In both the intra-operative and post-operative examples, the
sensing module 200 has a form factor that is dimensionally smaller than a prosthetic component. In one embodiment, wired connections for power and communication are not used. In an intra-operative environment, wired connections can get in way of the procedure and limit surgical access. Internal implanted prosthetics such as knee, hip, spine, shoulder, and other joint implants cannot be wired unless terminals protrude through the skin. This is typically not desirable nor an effective long-term solution. Thesensing module 200 can incorporate a battery as a temporary power source. As disclosed above, the battery poses the logistical problems of shelf life, installation, charging, and biological hazard. An alternative solution to a battery is using a super or ultra capacitor to power thesensing module 200. The capacitor has the benefits of form factor, long life, and fast charging time in a solid-state device. - The one limitation of a capacitor is the tradeoff of form factor and charge storage. A super or ultra capacitor having a form factor equal to or smaller than a watch battery or other small battery will typically have less energy capability than the battery. In an intra-operative procedure, such as a total knee reconstruction, the
sensing module 200 has to deliver precision measurements throughout the surgery. A typical implant operation can last from one hour to several hours. Similarly, thesensing module 200 in a final prosthetic component would need to last a sufficient time to run through one or more measurements of one or more parameters. In both intra-operative and post-operative measurements, the measured parameter data would be sent wirelessly to the surgeon, patient, or healthcare provider. The measured data can be sent in real-time for display or delayed to be reviewed or analyzed at an appropriate time. In general, powering thesensing module 200 with a capacitor would not be a viable solution using off the shelf electronic components or sensors. A capacitor meeting the form factor requirements would not store sufficient charge to sustain device operation for a required operational period of time. -
Sensing module 200 comprises a compact low-power energy source 1400 that includes thecapacitor 1410 that powers the device during a measurement process. Thecapacitor 1410 is able to sustain operation ofsensing module 200 by incorporatingpower management circuitry 1412 having one or more power conservation modes and an application specific integrated circuit (ASIC). The circuitry ofsensing module 200 comprisesoperational circuitry 1414, charging circuitry, andpower management circuitry 1412. Theoperational circuitry 1414 operates one or more sensing assemblages, controls measurement sequences, processes sensing assemblage data, and transmits information. Thepower management circuitry 1412 operatively couples to circuitry of compact low-power energy source 1400 andoperational circuitry 1414 to controllably manage power efficiency of the system thereby enabling the use of thecapacitor 1410 topower sensing module 200 for intra-operative and post-operative muscular-skeletal parameter measurements. - In one embodiment, the circuitry of
sensing module 200 comprises at least one ASIC. The ASIC comprises the majority of the electronic system. The ASIC is architected to operate at low power and provide functionality to perform sensor measurements. In particular, the ASIC includespower management circuitry 1412,operational circuitry 1414, portions of compact low-energy source 1400, and can include wireless communication circuitry. The ASIC comprises complementary metallic oxide semiconductor (CMOS) circuitry that is low voltage and low leakage. The voltage operation is typically 5 volts or less. Voltage operation of analog circuitry can be higher. Digital circuitry can be operated at lower voltages such as 1-3 volts to further reduce power consumption. The ASIC provides a benefit of reduced form factor and low-power operation. - The ASIC is further configured in a block architecture. In particular, the
operational circuitry 1414 is partitioned in a manner whereby functional blocks can be controlled by thepower management circuitry 1412. A partitioned block, typically performs a function that is independent or not reliant on other blocks being operated and thereby can be turned on or off dependent on need to minimize power consumption. In particular, thepower management circuitry 1412 can disable or delay operation of one or more functional blocks to reduce power consumption. In one embodiment, thepower management circuitry 1412 makes these decisions based on monitoring the charge or voltage on the capacitor. The amount of charge or voltage can be used to determine when a block is enabled. Partitioning circuit components between structures within the integrated circuit and discrete components enhances design flexibility and minimizes power consumption without compromising performance. Partitioning functions between analog and digital circuitry also enhances design flexibility and facilitate minimizing power consumption without sacrificing functionality or performance. - In a first step, a highly efficient step-up or step-down voltage converter is implemented in the compact low-
power energy source 1400. The step-up or step-down voltage converter circuitry enables essentially “lossless” translation of voltage levels. Further conservation of charge is achieved through selection of operating voltages and frequencies that meet device performance specifications. In a second step, reduction in power dissipation is achieved by operating circuitry at minimum frequencies and voltage. The clocking circuitry can be a significant source of power dissipation. Clock drivers can be optimized to efficiently drive a predetermined load. A clock tree or distributed clocking network can be used. The clock tree distribution is optimized in conjunction with the clock drivers to minimize delay and maintain timing at and between distributed nodes providing clock signals. In a third step, the clocked circuitry and the clock frequencies are optimized for power and sized to assure digital circuit blocks are each operated at the optimum clock frequency to achieve required performance with minimum power consumption. - Disclosed below are further exemplary embodiments to reduce power consumption of
sensing module 200 that utilizes a temporary power source. Thepower management circuitry 1412 places thesensing module 200 in one or more power conservation modes depending on a current power status as disclosed below. In general, the ASIC can have multiple input and output channels. Each channel can have a dedicated function. For example, input channels can be used to couple to multiple sensors to measure different parameters of the muscular-skeletal system such as temperature, load, or pH. In a fourth step, the input-output channels are operated such that a single output channel or a single input channel is enabled at any point in time. Thus, the inputs or outputs are enabled sequentially or in sequence and are not operated in parallel to improve power efficiency. In a fifth step, a single input circuit and a single output circuit is used. This eliminates parallel input or output operation. The single input and single output circuit are multiplexed to the input-output channels. Typically, measurements of the muscular-skeletal system are not time constrained allowing sequential operation of the input-outputs to reduce peak power consumption. Furthermore, integrating only the single input circuit and the single output driver reduces the surface area of the integrated circuit as well as the amount of active circuitry thereby minimizing parasitic leakage paths. - In a sixth step, the architected design of the ASIC includes matching such that the input-output channels matches the input and output requirements of external signals. In the example, specific knowledge of the component characteristics is required to provide the match. In one embodiment, impedance matching produces an efficient energy transfer into and out of the ASIC thereby conserving power. For example, power efficient matching networks are used for coupling to telemetry, sensors, or transducers. The matching is accomplished with appropriate design of the outputs, drivers, and control circuitry within the ASIC that couple to off-board components and devices. In a seventh step, off-board sensors and transducers are also operated at optimum frequencies and drive voltages and currents to achieve the required performance of the wireless module or device at the minimum level of power consumption. Similarly, in an eighth step, operation of all circuit blocks, charging circuitry, and telemetry circuitry are each optimized for minimum total power consumption to achieve required performance levels. This includes, but is not limited to, timing of off and on states. This is coordinated to minimize power drain by optimizing timing and duty cycles of all individual circuit blocks including power drain when powered off plus power consumption to restart each circuit block versus standby power consumption of the separate circuit blocks.
- The integration of design methods for ultra low power consumption achieves outstanding performance with minimum power drain. This enables highly performing wireless modules or devices powered by a capacitive energy storage device including, but not limited to, ultracapacitors, ultra capacitors, super-caps, super capacitors, or other capacitors. Furthermore, the
power management circuitry 1412 can operate in one or more power conservations modes. In a first power conservation mode, thepower management circuitry 1412 can turn off, disable, decouple, or disconnect circuitry not being used to conserve power. In a second power conservation mode, thepower management circuitry 1412 decouples or turns off the compact low-power energy source 1400 thereby operating on power fromcapacitor 1410 whenpower management circuitry 1410 detects thatwireless energy source 1402 cannot adequately provide energy or the wireless connection is unstable. In a third power conservation mode, thepower management circuitry 1412 reduces a frequency of operation of one or more blocks in the ASIC to reduce operating power. In a fourth power conservation mode, thepower management circuitry 1412 disables clock drivers of a clock tree coupled to circuitry not being used. In a fifth power conservation mode, thepower management circuitry 1412 can place the operational circuitry in a sleep mode when the circuit is idle for a predetermined time. In a sixth power conservation mode, thepower management circuitry 1412 allows parameter measurements to be taken and stored in memory. This can occur when thecapacitor 1410 falls below a predetermined threshold. The parameter measurement data is delayed until to an appropriate time to conserve power. In a seventh power conservation mode, only a single input or single output of the ASIC is operated at any time. Finally, an orderly shutdown occurs to preserve parameter measurement data when thepower management circuitry 1412 detects that the capacitor falls below a predetermined threshold. In general, thesensing module 200 can be powered by thecapacitor 1410 as a result of the power conservation modes and power optimization thereby taking measurements for the duration of a total knee reconstruction. Benefits of the use of capacitors as a power source instead of, or in conjunction with, other power sources or rechargeable technologies include, but are not limited to, enabling a high level of miniaturization, solid state with no chemistries, almost infinite storage lifetime, storage with zero charge, quick charge times, and wireless charging. -
FIG. 15 is a partial cross-section schematic side view of asensing platform 1500 including multiple constructed levels comprising electronic substrates with electronic components mounted thereon in accordance with an exemplary embodiment. In the non-limiting example, the sensing platform is used to measure a force, pressure, or load. It is a schematic image of components that fit together to make up an assemblage of transducers, interface materials, electrical interconnect, elastic columns, and mechanical structure using multiple electrical substrates. - A sensing assemblage comprises
energy propagation medium 1516,transducer 1512, andtransducer 1514.Energy propagation medium 1516 is positioned betweentransducer energy propagation medium 1516 is shaped as a column.Transducers energy propagation medium 1516. Electronic circuitry coupled totransducers top plate 1502 and abottom plate 1504. Typically, thebottom plate 1504 provides aresistance 1510 and theload 1508 is applied to thetop plate 1502. In general,plates -
Flexible interconnect 1506 assures integrity of interconnect while allowingtop plate 1502 to move whenload 1508 is applied to the surface. The elastic strength ofenergy propagation medium 1516 contributes to supportingtop plate 1502. The energy propagation medium further maintains a spacing betweenplates plates sensing platform 1500 will repeatably return to this predetermined distance under a zero force or quiescent condition. The distance betweenplates load 1508 applied to thetop plate 1502.Flexible interconnect 1506 provides reliable electrical interconnect to thetransducers energy propagation medium 1516 or compromising the integrity of the quantification of the externally applied force, pressure, orload 1508. - In one embodiment, the
transducer 1512 contacts an interior surface oftop plate 1502. Similarly, thetransducer 1514 contacts an interior surface ofbottom plate 1504.Transducers top plate 1502 andbottom plate 1504. Thetop plate 1502 and thebottom plate 1504 can comprise an electrically conductive material that can respectively be used as an interconnect to a terminal oftransducer 1512 andtransducer 1514. Theflexible interconnect 1506 is routed to make electrical contact withtransducers upper transducer 1512 or piezoelectric component has a conductive interface material or materials where required, solder or conductive adhesive, for electrical connection withflexible interconnect 1506. Thelower transducer 1514 or piezoelectric component has a conductive interface material or materials where required, comprising solder or conductive adhesive 1520 for electrical connection with a second fold or portion offlexible interconnect 1506. Note, that the flexible interconnect includes a bend, fold, orarc 1522 to provide interconnect to different locations in the sensing assemblage. In the example, the sensing assemblage forms a stack comprisingtop plate 1502,transducer 1512, a first level offlexible interconnect 1506,energy propagation medium 1516, a second level offlexible interconnect 1506,transducer 1514, andbottom plate 1504. In this configuration, an energy wave couples through theflexible interconnect 1506. Moreover, theload 1508 is also applied through theflexible interconnect 1506 as part of the sensing assemblage. Underload 1508, the energy propagation medium is the only component of the stack that changes length. -
FIG. 16 is a partial cross-section schematic side view of thesensing platform 1500 including multiple constructed levels comprising electronic substrates with electronic components mounted thereon in accordance with an exemplary embodiment. Thesensing platform 1500 has, in addition to the sensing assemblage or assemblages, printedcircuit boards circuit boards electronic components 1610.Electronic components 1610 comprise power source circuitry, power management circuitry, telemetry, and operational circuitry for performing parameter measurements.Electronic components 1610 are interconnected by interconnect formed on or within printedcircuit boards Electronic components 1610 are coupled to the sensing assemblage byflexible interconnect 1506. - In the embodiment, the sensing assemblage is between
top plate 1502 andbottom plate 1504. The example sensing assemblage includes anupper transducer 1512 positioned in contact withtop plate 1502 and a first side ofenergy propagation medium 1516. Similarly, thelower transducer 1514 is positioned in contact withbottom plate 1504 and a second side ofenergy propagation medium 1516. This can include conductive interface material or materials where required, solder or conductive adhesive 1602 and 1518 respectively for electrical interconnect withtop plate 1502 and electrical contact withflexible interconnect 1506. Thelower transducer 1514 has conductive interface material or materials where required, solder or conductive adhesive 1608 and 1520 respectively for electrical interconnect withbottom plate 1504 and withflexible interconnect 1506. Solder or conductive adhesive 1608 physically and electrically connect the components. Anupper ground disk 1604 provides electrical connection betweentop plate 1502 andflexible interconnect 1506. Thelower ground disk 1606 provides electrical connection betweenbottom plate 1504 andflexible interconnect 1506. An electrical circuit comprisingelectronic components 1610 and the sensing assemblages is completed byflexible interconnect 1506 that enableselectronic components 1610 to operatively controltransducers energy propagation medium 1516. - The
electronic components 1610underlie bottom plate 1504. In one embodiment,bottom plate 1504 is a rigid substrate that isolateselectronic components 1610 from any of the force, pressure, or load applied to the sensing platform. Having the one or more sensingassemblages overlying components 1610 provides a compact profile that allows a sensing module to have a form factor that can be fitted into a prosthetic component for the muscular-skeletal system. At least one printed circuit board is used to connect theelectronic components 1610. In one embodiment, two printed circuit boards are implemented comprising a lowerelectronic circuit board 1616 and an upperelectronic circuit board 1612. Theflexible interconnect 1506 is routed to make electrical contact with the sensing assemblage, upper printedcircuit board 1612 and lower printedwiring board 1616. Theflexible interconnect 1506 is placed between and electrically connected to printedcircuit boards integrated antenna 1614 is formed on the lower printedcircuit board 1616. As shown, the sensing module includes a stack of five or more layers of interconnect. Theflexible interconnect 1506 comprises three levels of interconnect in the stack. -
FIG. 17 is a partial cross-section schematic side view of asensing module 1700 including multiple constructed levels comprising electronic substrates with electronic components mounted thereon in accordance with an exemplary embodiment. In particular, thesensing module 1700 includes ahousing 1706 and acap 1702. Thehousing 1706 andcap 1702 form an encapsulating enclosure. The encapsulated enclosure houses sensing assemblages, electronic components, electrical interconnect, and mechanical structure using multiple electrical substrates and encapsulating structure as disclosed herein above. In one embodiment, the encapsulating enclosure is hermetically sealed. - The
housing 1706 comprises sidewalls 1716 and abottom surface 1714.Housing 1706 is made of a rigid material such as polycarbonate that can support the force, pressure, or load applied to thesensing module 1700 without flexing and is biocompatible. The interior of sidewalls 1716 include support features or ledges to suspend components at a predetermined height withinhousing 1706.Ledges bottom plate 1504, printedcircuit board 1612, and printedcircuit board 1616. The structures can be attached to the ledges by mechanical fastener, adhesive, or other attaching methodology. In one embodiment, theelectronic components 1610 on printedcircuit board 1616 face thebottom surface 1714 ofhousing 1706. Theelectronic components 1610 mounted on printedcircuit board 1612 face thebottom plate 1504. The electronic components can be selected for each printed circuit board to minimize the combined height thereby reducing the form factor ofsensing module 1700. - In one embodiment, an exterior surface of
top plate 1502 extends above an upper surface ofsidewalls 1716. Thecap 1702 overliestop plate 1502 and the upper surface ofsidewalls 1716.Cap 1702 includes a lip that extends over an exterior surface ofsidewalls 1716. An adhesive 1704 is placed between thesidewall 1716 and the lip ofcap 1702 to attach and seal the encapsulating enclosure. Thus, the sensing assemblage andelectronic components 1610 are isolated from an external environment. In the example, a force, pressure, or load is applied to the exterior surface ofcap 1702. The force, pressure, or load changes a length ofenergy propagation medium 1516. The change in length over the measurement range can be small. For example, energy propagation medium can change less than 5 millimeters to measure a range of 0 to 100 lbs of force. In other embodiments, the change in length can be substantially less than 5 millimeters depending on the material used forenergy propagation medium 1516. The length change corresponds to the movement ofcap 1702 andtop plate 1502. Thus,cap 1702 andtop plate 1502 are moveable structures in relation tohousing 1706. The adhesive 1704 is chosen to allow this movement. For example, a silicone can be used as the adhesive, which is flexible and allows movement. The silicone will also seal the encapsulating enclosure. Alternatively, an o-ring can be used in place of adhesive 1706 as a mechanical solution that allows sealed movement. The transit time, frequency, or phase of propagated energy waves through medium 1516 is captured byelectronic components 1610. The transit time, frequency, or phase can be converted to a length ofenergy propagation medium 1516, which is then related to the force, pressure, or load. - A method of electronic assembly is disclosed hereinbelow. The method can be practiced with more or less than the number of steps shown and is not limited to the order shown. To describe the method, reference will be made to the components of
FIG. 17 , although it is understood that the method can be implemented in any other manner using other suitable components. In a first step, the conductive interface material or materials are positioned in contact with or affixed to planar or conformal surfaces of each piezoelectric resonator or transducer. In a second step, the sensing assemblage or assemblages, having piezoelectric resonators ortransducers conductive tape flexible interconnect 1506,top plate 1502,bottom plate 1504,electronic components 1610, upper printedcircuit board 1612 and lower printedcircuit board 1616 thereby enabling electrical connection and mechanical robustness. Other conductive attaching techniques can be used such as attaching components with double-sided conductive tape or conductive epoxy. Adhesive tape that conducts electricity in the transverse direction only is another example of a conductive adhesive. Magnesium is an example of a potential interface material. - In a first variation, the
flexible interconnect 1506 is routed to provide additional electrical interconnect to both faces of the transducers thus eliminating the requirement for multiple upper transducers or piezoelectric components to share a common electrical connection. Likewise, the requirement for multiple lower transducers or piezoelectric components sharing a common electrical connection can be eliminated by routing flexible interconnects to provide electrical contact to both faces of these components. This would require additional folds or segments of flexible interconnect. In a second variation,cap 1702 has an external surface that is non-planar or has a conformal surface. The integration of the non-planar or conformal surface or surfaces within the structure of the encapsulatingenclosure 304 does not compromise the protective, hermetic, or mechanical support provided by theenclosure 304. In a third variation, an elastic support between top andbottom plates sensing module 1700. The elastic support provides greater flexibility in selecting the maximum force, pressure, orload 1508 that is quantified. In a fourth variation, thetransducer 1512 in the sensing assemblage is replaced with a reflective surface or body and all signals propagating within the energy propagation medium is emitted and detected bytransducer 1514. Using the reflective surface also eliminatestop ground disk 1604. In a fifth variation, the sensing assemblage is a MEMS, piezo-resistive, mechanical, or strain gauge device coupled toflexible interconnect 1506. -
FIG. 18 is a cross-sectional view of thesensing module 1700 having a small form factor in accordance with an exemplary embodiment. In the example, the external pressure or load can be reliably detected and quantified by the interconnected sensing assemblages and electronic components without direct physical contact.Sensing assemblages 1802 comprises one or more transducers and a compressible propagation medium. Detail of the sensing assemblages1802 is not visible in this view.Electronic components 1610 are affixed to the upper side of the upper printedcircuit board 1612 and the lower side of the printedcircuit board 1616 for mechanical support and electrical interconnect. Theflexible interconnect 1506 couples theindividual transducers electrical components 1610 on the printedwiring boards flexible interconnect 1506 that extend in an arc to two different levels of flexible interconnect running through thesensing assemblages 1802 that in one embodiment is part of the multi-layer interconnect stack. - The encapsulated sensing module or
device 1700, as illustrated, comprises thecap 1702 ofhousing 1706 that encloses the electronic assemblage comprising sensing assemblages, interconnect, and electronic components. Thetop plate 1502 transfers flexor with changes inload 1508 of the load bearing surface of thecap 1702 to the sensing elements of thesensing assemblages 1802. Mechanical support for electrical and mechanical components within the encapsulatedsensing module 1700 is provided by features, ledges, and structures designed into the walls of thehousing 1706. -
FIG. 19 is a perspective view of the interconnect stack of thesensing module 1700 in accordance with an exemplary embodiment. In the embodiment, threeassemblages 1802 couple to predetermined positions of the top plate 1502 (not shown).Multiple sensing assemblages 1802 are used to measure the force, pressure, or load and to identify where on the top plate 1502 (not shown) the parameter was applied. The location where the parameter is applied is determined by the magnitudes measured by eachsensing assemblage 1802, the differential between the measurements, and the location where each sensing assemblage couples to top plate 1502 (not shown). Thesensing module 1700 illustrates flexible interconnect supporting electronic components within the sensing assemblage orassemblages 1802. A single flexible interconnect comprises three levels of interconnection in the interconnect stack. Afirst level 1806 of the flexible interconnect is shown coupling between thetransducers 1512 and correspondingenergy propagation medium 1516. The first level offlexible interconnect 1806 includes a fold, bend, orarc 1812 that connects to athird level 1810 of the flexible interconnect. Asecond level 1808 of the flexible interconnect is shown coupling betweenenergy propagation medium 1516 and the lower transducer 1514 (not shown). Thesecond level 1808 of the flexible interconnect includes anarc 1804 that connects to thethird level 1810 of the flexible interconnect. Note that both thefirst level 1806 and thesecond level 1808 includes interconnect that respectively connects to the threetransducers third level 1810 of theflexible interconnect 1506 is between and connected to printedcircuit boards circuit boards sensing assemblages 1802 to generate parameter measurements from eachsensing assemblage 1802. The upper and lower printed circuit,boards flexible interconnect 1506,electronic components 1610, andbottom plate 1504 illustrate the spatial and mechanical relationships among the electrical substrates. Thebottom plate 1504 is between thesensing assemblages 1802 and theelectronic components 1610. It should be noted that in the embodiment, the flexible interconnect is part of the transmission path of the sensing assemblage. Energy waves transmit through the flexible interconnect into theenergy propagation medium 1516. Similarly, propagated energy waves exiting theenergy propagation medium 1516 transmit through the flexible interconnect to be detected by a transducer. -
FIG. 20 is a partial cross-section schematic side view of asensing platform 2000 including multiple constructed levels comprising electronic substrates with electronic components mounted thereon in accordance with an exemplary embodiment. It is a schematic image of components that fit together to comprise an integrated assemblage having asensor 2002 attached to flexibleelectrical interconnect 1506 and supported bytop plate 1502 andbottom plate 1504 within an encapsulating enclosure as described hereinabove. Thesensor 2002 replaces the sensingassemblage comprising transducer 1512,energy propagation medium 1516, andtransducer 1514 shown inFIG. 15 . In the embodiment, a thin film piezo-resistive sensor is used assensor 2002 to measure the applied force, pressure, orload 1508. Piezo-resistive pressure sensors typically comprise a layer of pressure sensitive ink sandwiched between two conductive layers. The combination of conductive layers and pressure sensitive ink is encapsulated in a flat package with leads typically extending from a sidewall of the sensor.Sensor 2002 can have a thin form factor that reduces a height of the sensing module. Furthermore, piezo-resistive sensor 2002 is shaped in a manner that allows interconnect stacking. Thesensor 2002 has a low level of conductance under a quiescent condition when no force, pressure, or load being applied to the piezo-resistive film. The quiescent condition can also be at a predetermined force, pressure, or load depending on the application. Applying a force, pressure, or load to the piezo-resistive film applies pressure to the ink layer. In the embodiment, the force, pressure, or load applied totop plate 1502 compresses thesensor 2002. The pressure on the ink increases the conductance as conductive particles are forced in contact or in proximity to each other. The more tightly they are compressed, the lower the resistance ofsensor 2002. Conversely, as pressure is removed, the resistance ofsensor 2002 returns to its quiescent state. Thesensing platform 2000 can include an elastic structure (not shown) that returns the top plate to a precise position in relation tobottom plate 1504 after the force, pressure, or load is removed. - In one embodiment, the piezo-resistive sensing assemblage is a stack that comprises a
load disk 2004,adhesive layer 2006,sensor 2002, and anadhesive layer 2008. Theload disk 2004 is a spacer or column that is non-compressible or inelastic. Theload disk 2004 can have a major surface that evenly distributes the force, pressure, or load across themajor surface sensor 2002.Adhesive layer 2006 is non-conductive tape, adhesive, or other securing means that attachesload disk 2004 tosensor 2002. In the embodiment, theload disc 2004 is positioned respectively betweentop plate 1502 andbottom plate 1504.Adhesive layer 2008 is non-conductive tape, adhesive, or other securing means that attachessensor 2002 tobottom plate 1504.Top plate 1502 transmits the level of force, pressure, orload 1508 externally applied to the top surface (not shown) of the encapsulated enclosure (not shown). Theload disk 2004 then couples load 1508 fromtop plate 1502 tosensor 2002. Thebottom plate 1504 is rigidly supported, through the mechanical structure of the encapsulating enclosure to maintainresistance 1510 to movement thereby enabling accurate quantification of the externally applied force, pressure, orload 1508. - In one embodiment,
sensor 2002 hasinterconnect Interconnect flexible interconnect 1506. Alternatively,sensor 2002 can have electrical contact terminals on either or both major surfaces that receive loading. In this embodiment,flexible interconnect 1506 would be part of the sensing assemblage stack betweenupper tape 2006,lower tape 2008, andsensor 2002 to make one or more connections. Moreover, theflexible interconnect 1506 would receiveloading 1508 as part of the sensing assemblage. Current flow throughupper interconnect 2010,sensor 2002, andlower interconnect 2012 is modulated by changes in force, pressure, orload 1508. This current flow is carried through traces on the surface offlexible interconnect 1506 to electronic circuitry (not shown) within the sensing module.Flexible interconnect 1506 provides reliable electrical interconnect to the one or more piezo-resistive sensing assemblages without restricting the transmission or compromising the integrity of the force, pressure, orload 1508 applied to the sensing module. In general, thin film piezo-resistive pressure sensors have benefits of simplicity, cost, power, form factor when compared to other sensing technologies. Interfacing withsensor 2002 and interpreting measurement data can reduce both mechanical and circuitry requirements thereby providing further benefit. -
FIG. 21 is a partial cross-section schematic side view of thesensing platform 2000 including multiple constructed levels comprising electronic substrates with electronic components mounted thereon in accordance with an exemplary embodiment. Thesensing platform 2000 has, in addition to the sensing assemblage or assemblages, printedcircuit boards circuit boards electronic components 1610.Electronic components 1610 comprise power source circuitry, power management circuitry, telemetry, and operational circuitry for performing parameter measurements.Electronic components 1610 are coupled to the sensing assemblage byflexible interconnect 1506. In one embodiment, usingsensor 2002 in the sensing assemblage requires four layers of electrical interconnect. - The
electronic components 1610 underlie bottom plate 1504 (not shown). In one embodiment,bottom plate 1504 is a rigid substrate that isolateselectronic components 1610 from any of the force, pressure, or load applied to the sensing platform. Having the one or more sensingassemblages overlying components 1610 provides a compact profile that allows a sensing module to have a form factor that can be fitted into a prosthetic component for the muscular-skeletal system. At least one printed circuit board is used to connect theelectronic components 1610. In one embodiment, two printed circuit boards are implemented comprising a lowerelectronic circuit board 1616 and an upperelectronic circuit board 1612. Theflexible interconnect 1506 is routed to make electrical contact with the sensing assemblage, upper printedcircuit board 1612 and lower printedwiring board 1616. Theelectronic components 1610 detect and digitize changes in levels of the conductance of thin film piezo-resistive sensor 2002. The measured value of conductance can be converted to a force, pressure, or load value. Theflexible interconnect 1506 is placed between and electrically connected to printedcircuit boards antenna 1614 for the wireless communication. In one embodiment, theantenna 1614 is formed on the lower printedcircuit board 1616. The antenna is a conductive trace on the printedcircuit board 1616 formed in loop around the periphery. As shown, the sensing module includes a stack of four layers of interconnect. Theflexible interconnect 1506 comprises has connections at two levels of interconnect in the stack. -
FIG. 22 is a partial cross-section schematic side view of asensing module 2200 including multiple constructed levels comprising electronic substrates with electronic components mounted thereon in accordance with an exemplary embodiment. In particular, thesensing module 2200 includes ahousing 1706 and acap 1702. Thehousing 1706 andcap 1702 form an encapsulating enclosure. The encapsulated enclosure houses sensing assemblages, electronic components, electrical interconnect, and mechanical structure using multiple electrical substrates and encapsulating structure as disclosed herein above. In one embodiment, the encapsulating enclosure is hermetically sealed. - The
housing 1706 comprises sidewalls 1716 and abottom surface 1714.Housing 1706 is made of a rigid material such as polycarbonate that can support the force, pressure, or load applied to thesensing module 1700 without flexing and is bio-compatible. The interior of sidewalls 1716 include support features or ledges to suspend components at a predetermined height withinhousing 1706.Ledges bottom plate 1504, printedcircuit board 1612, and printedcircuit board 1616. In addition, support structures can be coupled from the bottom surface ofhousing 1706 for further support or as an option to the ledges. The structures can be attached to the ledges by mechanical fastener, adhesive, or other attaching methodology. In one embodiment, theelectronic components 1610 on printedcircuit board 1616 face thebottom surface 1714 ofhousing 1706. Theelectronic components 1610 mounted on printedcircuit board 1612 face thebottom plate 1504. The electronic components can be selected for each printed circuit board to minimize the combined height thereby reducing the form factor ofsensing module 1700. - In one embodiment, an exterior surface of
top plate 1502 extends above an upper surface ofsidewalls 1716. Thecap 1702 overliestop plate 1502 and the upper surface ofsidewalls 1716.Cap 1702 includes a lip that extends over an exterior surface ofsidewalls 1716. An adhesive 1704 is placed between thesidewall 1716 and the lip ofcap 1702 to attach and seal the encapsulating enclosure. Thus, the sensing assemblage andelectronic components 1610 are isolated from an external environment. In the example, a force, pressure, or load is applied to the exterior surface ofcap 1702. The force, pressure, or load is applied throughtop plate 1502 andload disk 2004 tosensor 2002. Thehousing 1706 andbottom plate 1504 provide a resistance against the force, pressure, or load thereby compressing thesensor 2002. The applied force, pressure, or load to the piezo-resistive film ofsensor 2002 results in a corresponding change in resistance of the film. Theelectronic components 1610 couple tosensor 2002 throughflexible interconnect 1506 forming a sensing circuit that detects a change in current or voltage as a result of a resistance change in the piezo-resistive material. The measured current or voltage directly corresponds to the force, pressure, or load. The measurement be stored in memory or transmitted. It should be noted that the applied force, pressure or load causes movement ofcap 1702 andtop plate 1502. Thus, both are moveable structures in relation tohousing 1706. The adhesive 1704 is chosen to allow this movement. For example, a silicone can be used as the adhesive, which is flexible and allows movement. The silicone will also seal the encapsulating enclosure. An o-ring could also be used in place of adhesive 1706 as a mechanical solution. -
FIG. 23 is aperspective view 2300 of anexemplary loop antenna 2302 in accordance with one embodiment. As shown, theloop antenna 2302 is integrated along a periphery of the medical device to maximize the antenna trace length and exposure. In such an arrangement, theloop antenna 2302 radiates energy outwards along the circumference of the sensing module thereby enabling low-power operation when used in conjunction with a receiver placed in the vicinity of the sensing module. For instance, in the context of a loadsensing insert device 100 used in knee implant surgery, the outer periphery is closest to the outside of the knee where a receiver device can be placed on the skin to scan thesensing module 200 for communication data. In this illustration, theloop antenna 2302 forms one or more loops along the outermost periphery of the encapsulatedsensing module 200 as permitted by the encapsulated printed circuit board or electronic packaging substrate. Aport 2304 includes two terminals that serve to couple theloop antenna 2302 to electronic components of thesensing module 200, such as thetransceiver 320. Theport 2304 can also couple external to thesensing module 200. Theport 2304 couples to communication circuitry within thesensing module 200 and an antenna. In one embodiment, a matching network can be placed betweentransceiver 320 andantenna 2302 to improve efficiency. In an alternative embodiment, theloop antenna 2302 is formed on a flexible interconnect instead of a printed circuit board within thesensing module 200. The flexible interconnect couples theantenna 2302 to the communication circuitry and can include a bend that positions theloop antenna 2302 appropriately within the sensing module for transmission of data. - In another embodiment, the
loop antenna 2302 is electrically coupled to theinsert dock 202. Theinsert dock 202 is larger than sensingmodule 200 and has a larger peripheral area. A longer conducting antenna loop is formed in, on, or around theinsert dock 202 for radio frequency communication. As an example, theinsert dock 202 includes electrical wiring to serve as theloop antenna 2302. A hermetically sealed communications port resides onsensing module 200. As mentioned, theport 2304 couples to the communication circuitry and can be external to thesensing module 200. In one embodiment,port 2304 couples to the matching network. The external communication port onsensing module 200 connects to a corresponding port on the insert dock when inserted. The port or terminals oninsert dock 202 connect to the antenna loop in or on theinsert dock 202. In yet another arrangement, theinsert dock 202 can comprise metal for being a conductor of radio communications. -
FIG. 24 is aperspective view 2400 of anintegrated loop antenna 2402 according to another embodiment. As illustrated, theintegrated loop antenna 2402 is integrated into a substrate of a printedcircuit board 2406 of thesensing insert device 100. Other embodiments are not limited to the illustrated loop, or similarly shaped or functioning integrated loop antennas. As shown, theintegrated loop antenna 2402 comprises circuit traces 2404 on a top (or bottom) layer of the substrate of thecircuit board 2406. Thetraces 2404 act as a portion of the radiating and receiving body of theintegrated loop antenna 2402. Thecircuit board 2406 can comprise multiple interconnect layers that can be formed as part of the radiating and receiving body, counterpoise, reflectors, or other structural components of theantenna 2402. The circuit traces 2404 can be etched to navigate around other electrical components and even the edge of the circuit board in certain embodiments. - Printed circuit technology supports the creation of many shapes of conductors and conducting surfaces on each layer of a multi-layer circuit board or flexible substrate. These conductors and conducting surfaces may be arranged and interconnected to function as radiating or receiving, reflection, and other surfaces of an integrated antenna. The conductors and conducting surfaces on each individual layer of the substrate may be interconnected in a variety of configurations. Conductors and conducting surfaces on each layer of the substrate may also be connected with conductors and conducting surfaces on other layers in a variety of configurations. This provides flexibility to design and integrate many forms of antennas with different radiation patterns, polarizations, frequency ranges, levels of Q, and impedance characteristics.
- The
circuit board 2406 comprises a matching network A, a radio frequency output stage B, and optional receiver circuit C. These block diagram components are functionally related to thetransceiver 320 andelectronic circuitry 307 ofFIG. 5 . The block models can comprise analog components, digital components, discrete components, integrated circuit components or any combination thereof. As shown, the circuitry is mounted oncircuit board 2406. The matching network A provides impedance matching to an external receiver communications network to provide optimal power efficiency. The radio frequency output stage B drives the matching network A. The radio frequency output stage B amplifies and transmits communication signals to an external receiver. In the example, the communication signal will carry information that includes parameter measurement data such as load and balance measurements. The receiver circuit C is an optional component that can be integrated by way of switching (e.g., a Transmit-Receive (TR) switch) to receive data communications from an external transmitter, for example, to download a serial number. - The integration of the
antenna 2402 into a rigid or flexible substrate for electronic circuits enables highly compact Radio Frequency (RF) modules, devices, instruments, or equipment with adequate radiating efficiency to operate at low power levels in many short-range applications. Integrated antennas have adequate receiving sensitivity for many of these applications as well. In one embodiment, the transmit power in conjunction with theloop antenna 2402 can be designed to limit the transmission distance. For example, it can restrict communication transmission to a distance corresponding to an operating room, doctor's office, or patient home thereby preventing or deterring others from receiving the measurement data. In one embodiment, thesensing module 200 is in an implant that would underlie tissue and portions of the muscular-skeletal system. In the embodiment, a portable receiver would be placed near the implant to receive or transmit information to the sensing module. These wireless modules, devices, instruments, or equipment may be constructed using high volume, low cost, standard manufacturing processes thus producing high quality, high reliability, deeply miniaturized radio frequency transmitter or receiver modules, devices, instruments, or equipment. - Integration of the
antenna 2402 within the electronic assembly enables the construction of compact wireless equipment. In addition to a wide range of short-range handheld, wearable, or other portable communication equipment, many applications may also include data measurement, collection, and communication modules, devices, or equipment for a wide range of applications. Additional potential applications may include, but are not limited to, a wide range of medical applications. Potential medical applications may include, but are not limited to, intra-operative medical devices, trial inserts, and implants, other short-term medical devices, including devices that are inserted or ingested, other implanted medical devices, wearable medical devices, handheld devices, disposable medical devices or modules, medical instruments, medical equipment, accessories for medical instruments and equipment, and disposables associated with medical instruments, equipment, accessories. -
FIG. 25 Illustrates by way of example, aplot 2500 of normalized radiatedfield strength 2502 versusfrequency 2504 performance of an example loop antenna integrated into a rigid or flexible substrate of the electronic circuit board. Theplot 2500 illustrates radiation efficiency of the antenna and matching network from a circuit analysis. By way ofelectronic circuitry 307, the loop antenna can be configured to produce a frequency ofmaximum power output 2506. The electronic circuitry can further shape the peak (or radiation pattern) via a tuning mechanism to narrow (broaden) the peak and the relative Q level of the antenna. As one example, the electronic circuitry can emit a beacon signal over a broad frequency span, and upon receiving a ping for a particular communication channel, self-configure to narrow the peak to receive further communications under optimal power communication settings. -
FIG. 26 Illustrates aradiation pattern 2600 of the loop antenna integrated into a flexible substrate of an electronic circuit in accordance with an exemplary embodiment. The axes of the null points are readily visible and indicate that direction performance of reception and transmission can be well suited to applications where directional communications minimize the potential for inference. For instance, in the current antenna layout pattern, wherein the loop antenna is along an outer periphery, a radiation pattern is generated in a shape that propagates away from the implant site and in a direction, which facilitates acceptable signal to noise ratio (SNR). As shown, thenull radiation lobes 2604 of theantenna pattern 2602 can be seen at positions where it may be less practical to place the receiver (e.g., along the femur or tibial axis), and that higher radiation lobes (or patterns) 2606 of theantenna pattern 2602 are along the outside periphery of the implant and are closest to the patient skin surface where a receiver can be placed. The magnitude of the signal corresponds to the intensity of the shading of the radiation pattern. The different shadings illustrated in a box 2608 correspond to the magnitude of the radiation pattern in different directions. In other embodiments, the loop antenna can be physically configured, and in conjunction with control circuitry, to indicate a strong directional pattern of preferred reception and transmission thus making one particular instance of an integrated loop antenna well suited to applications that require omni-directional communications. - While the present invention has been described with reference to particular embodiments, those skilled in the art will recognize that many changes may be made thereto without departing from the spirit and scope of the present invention. Each of these embodiments and obvious variations thereof is contemplated as falling within the spirit and scope of the invention.
Claims (20)
1. A sensing module for measuring a parameter of the muscular-skeletal system comprising:
a housing;
a printed circuit board in the housing where the printed circuit board is suspended a predetermined distance within the housing above a bottom surface where the printed circuit board includes an antenna for the transmission of measured parameter data from the sensing module.
2. The sensing module of claim 1 where a prosthetic component comprises the sensing module, where parameter measurements are taken in-situ, and where the prosthetic component is dimensionally substantially equal to a final prosthetic component.
3. The sensing module of claim 2 where a loop antenna is formed on the printed circuit board.
4. The sensing module of claim 3 where the loop antenna is formed on a periphery of the printed circuit board.
5. The sensing module of claim 4 where the loop antenna comprises more than one layer of interconnect on or in the printed circuit board.
6. The sensing module of claim 4 further including:
a transmit circuit coupled to receive parameter measurement data for transmission; and
a matching network coupled between the transmit circuit and the antenna.
7. The sensing module of claim 2 further includes terminals on an exterior of the sensing module where the terminals couple to the matching network.
8. The sensing module of claim 5 where the prosthetic component further includes a dock having an antenna where the sensing module inserted into the dock couples the terminals exterior to the sensing module to the antenna of the dock.
9. The sensing module of claim 2 where the prosthetic component is an insert for coupling between two bones of the muscular-skeletal system.
10. The sensing module of claim 1 further includes a sensing platform overlying the printed circuit board in the housing where the sensing platform comprises at least one sensing assemblage.
11. The sensing module of claim 10 further including at least one sensing assemblage comprising:
at least one transducer; and
an energy propagating structure to measure changes in transit time, frequency, or phase corresponding to the parameter being measured.
12. The sensing module of claim 10 further including at least three sensing assemblages for measuring a location where the parameter is applied to the sensing module.
13. A sensing system for measuring a parameter of the muscular-skeletal system comprising a prosthetic component having a sensing module therein to measure the parameter where the sensing module includes a loop antenna to transmit parameter data.
14. The sensing system of claim 13 where the prosthetic component is a final insert allowing articulation of at least two bones of the muscular-skeletal system.
15. The sensing system of claim 14 where the sensing module includes a sensing platform having at least three sensing assemblages to measure a force, pressure, or load and where the sensing platform measures a location where the force, pressure, or load is applied to a surface of the insert.
16. The sensing system of claim 14 where the antenna is formed on a printed circuit board or flexible interconnect.
17. A prosthetic component for measuring a parameter of the muscular-skeletal system comprising:
a dock to operatively couple to at least one prosthetic component;
a sensing module inserted in the dock where the sensing module couples to the muscular-skeletal system to measure the parameter; and
an antenna for transmitting measurement data from the sensing module.
18. The prosthetic component of claim 17 where the sensing module includes external terminals coupled to transmitting circuitry therein and where the dock includes an antenna that couples to the external terminals when the sensing module is inserted.
19. The prosthetic component of claim 17 where the sensing module includes at least one printed circuit board or flexible interconnect having a loop antenna formed thereon.
20. The prosthetic component of claim 17 where the sensing module includes a sensing platform comprising at least three sensing assemblages.
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