WO2002051299A2 - Electrical lockout photoplethysmographic measurement system - Google Patents
Electrical lockout photoplethysmographic measurement system Download PDFInfo
- Publication number
- WO2002051299A2 WO2002051299A2 PCT/US2001/043857 US0143857W WO02051299A2 WO 2002051299 A2 WO2002051299 A2 WO 2002051299A2 US 0143857 W US0143857 W US 0143857W WO 02051299 A2 WO02051299 A2 WO 02051299A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- probe
- resistor
- main instrument
- lockout
- light
- Prior art date
Links
Classifications
-
- 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
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6825—Hand
- A61B5/6826—Finger
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
- A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
-
- 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
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/683—Means for maintaining contact with the body
- A61B5/6838—Clamps or clips
-
- 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
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6843—Monitoring or controlling sensor contact pressure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0266—Operational features for monitoring or limiting apparatus function
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/08—Sensors provided with means for identification, e.g. barcodes or memory chips
Definitions
- the present invention generally relates to photoplethysmographic measurement systems and, in particular, to an electrical lockout for avoiding undesired transmission of optical signals by such photoplethysmographic measurement systems.
- the photoplethysmography measurement system generally includes a main instrument, a removable probe for attaching to a patient during a test, and a signal transmitter for delivering signals between the main instrument and the probe. Because the probe ordinarily makes direct contact with the patient's body during a medical examination, it is desirable that probes be disposable in order to reduce the risk of infection. Accordingly, the probe is typically detachable from the main instrument via a coupling disposed somewhere between the probe and housing.
- the componentry of the probe head is minimized by separating the light sources from the probe head to the main instrument or to another portion of the system (such as within a connector extending from the housing to the probe) that is detachably coupled to the probe head.
- the presently known photoplethysmography measurement devices do pose certain shortcomings.
- the light output from the fiber optic cable in conventional systems typically remains continuously turned on as long as the main instrument remains turned on. Thus, when the probe head becomes detached while the main instrument is active, the intense light emission from the end of the fiber optic cable could potentially expose a patient or clinician to intense illumination.
- a photoplethysmographic measurement system may be further enhanced by incorporating a safety feature to effectively prevent users, such as patients and medical personnel, from being exposed to high levels of light energy from the system when a probe becomes detached from the system during use. If the main instrument is able to sense when the probe becomes detached therefrom, certain operations may be performed therein in order to avoid energizing, or to de-energize, the light sources upon receiving an indication that the probe detached therefrom.
- any appropriate means for sensing detachment of the probe from the main instrument may be used.
- the present invention may employ inherent features of the probe and the coupling device in order to detect detachment of the probe.
- the coupling device between the main instrument and probe generally includes optical and electrical connections.
- the main instrument may be configured to detect breach of either the optical or the electrical connection.
- new features may be added to the system for purposes of providing feedback.
- a resistor or other electrical component may be incorporated into the probe so as to provide an electronic signature or a feedback.
- the main instrument has a feedback detector for detecting such an electrical component in the probe when it is properly connected thereto.
- the present invention may use a dedicated sensor in order to provide indication of proper connection.
- the connector port may be provided with a contact for purposes of indicating connection with the probe.
- an optical sensor may be employed to provide indication of connection across coupling sections.
- a photoplethysmographic measurement system for noninvasively measuring various blood analytes in a patient's appendage.
- the measurement system includes an electrical lockout which frequently or continuously interrogates the probe connection and automatically disconnects current flow to the light emitters upon receiving an indication that the probe or the cable is detached.
- the probe may include one or more preselected electrical elements which can be detected by the lockout of the main instrument. For purposes of determining if the probe is properly connected or has been accidentally disconnected, the electrical lockout frequently or continuously monitors an absence or presence of such electrical element.
- the probe is provided with a resistor having a predetermined resistor value.
- the electrical lockout continuously interrogates the probe connection in order to determine whether the value of the detected resistor falls within predetermined allowable levels. If the probe accidentally becomes disconnected from the main instrument, the detected value of the resistor will fall outside of the predetermined allowable levels indicative of an incompatible probe, an improper coupling of the probe, or a complete detachment of the probe.
- the lockout switch is employed to inhibit activation of the light emitters. When a proper connection is re-established, the electrical lockout will recognize the value of the detected resistor and send a signal to close the lockout switch, allowing current to pass and re-energize the light sources.
- the value of the resistor also serves to identify the type of probe presently connected to the system.
- a probe may be uniquely designed for attaching to a given appendage of a patient, such as a finger, earlobe, or the nasal septum so as to accommodate a variety of monitoring, conditions and situations.
- the identified probe-type information may be employed to determine the appropriate input light signals to be used to illuminate the patient's appendage and the appropriate computation to be used to process the transmitted light signals.
- the electrical lockout may include means for detecting the presence of a light sensor in the probe by checking for the appropriate forward voltage drop on the conductors connected to the light sensor.
- the probe is provided with a bandgap reference, wherein the amplitude of the bandgap reference voltage generated within the probe will be used to determine the presence and identify the type of probe.
- the electrical lockout includes a voltage detector to interrogate for a voltage drop at certain allowable levels at the probe head. If the bandgap reference voltage falls outside of the predetermined allowable voltage levels, the lockout will send a signal to open a lockout switch to turn off the light emitters.
- a contact, or set of contacts in the probe are required to continue to power the light emitters.
- disconnecting the probe removes power (or turns off a control signal) to the light emitters thus turning off the light emitters.
- any of these techniques may be used in combination to eliminate the possibility of emitters staying on in the presence of a single point failure.
- FIG. 1 is a block diagram illustrating an electrical lockout for a photoplethysmographic measurement system in accordance with a preferred embodiment of the present invention
- FIG. 2 is a flowchart diagram illustrating the operation of the photoplethysmographic measurement system of the invention.
- an electrical lockout photoplethysmographic measurement system is shown.
- the photoplethysmographic measurement system is used to noninvasively measure various blood analytes in a tissue of a patient.
- the photoplethysmographic measurement system may be a pulse oximetry system which noninvasively measures the oxygen saturation level.
- the electrical lockout photoplethysmographic measurement system is a pulse oximeter generally including a main instrument 10, a probe 12, and a signal transmission cable 14 connected between the main instrument and the probe head.
- the main instrument 10 includes a housing 16 which contains a plurality of light emitters 18 such as light emitting diodes (LED) or laser diodes, each emitter generating a light signal at a predetermined wavelength.
- the main instrument 10 also includes a processor 20 which provides all the computation capability necessary to control the overall operation of the system, and a display unit 22 for displaying measurement information regarding the patient to the physician.
- an input device 24 such as control knobs and/or a keypad is provided.
- a speaker 26 is connected to the processor 20 to audibly alert the user of potentially dangerous analyte levels.
- the signal transmission cable 14 includes one or more optical light guides 28, such as a fiber optic cable for delivering optical signals between the probe and the main instrument 10.
- the signal transmission cable 14 may be fixedly connected to the probe 12 as a single unit.
- the probe may be detachably connectable to the cable.
- the signal transmission cable 14 is configured so that it is detachably connectable at both probe 12 and the main instrument 10.
- the light signals 30 generated by the light sources 18 are transmitted via the signal transmission cable and are directed onto an appendage 32 of the patient via the probe.
- the probe 32 includes an attachment mechanism for securely attaching to a patient's appendage, such as a finger, earlobe, or the nasal septum, during a medical examination.
- the probe body may include a spring-loaded hinge for clamping on a patient's finger or velcro for securely wrapping the probe on an appendage.
- the probe also includes a light direction guide 36 to allow the light signal generated by the emitters to be directed substantially perpendicular to the surface of the skin and the blood carried thereunder.
- the guide 36 may include a mechanism for aligning the fiber end or a mirror associated with the fiber terminal.
- the light signals transmitted through the appendage may be delivered back to the main instrument optically; for example, via a second fiber optic cable in the signal transmission cable.
- the transmitted light signals are delivered electrically for processing by the processor.
- a light sensor 34 is provided on the probe located on the other side of the light direction guide 36 for receiving the light signals transmitted through the patient's appendage and converting the received light signals into electrical output signals.
- an electrical conductor 38 is connected to the light sensor 34 in the probe to deliver the electrical output signals to the processor 20.
- the probe 12 is first attached to the patient's appendage 32, the light signals carried by the fiber optic cable 28 illuminates the appendage, and after the intensity of the light signal has been affected by the blood in the appendage, the light sensor 34 is used to convert the transmitted light signals into an electrical output signal.
- the electrical output signal produced by the light sensor has characteristics that are a function of the blood oxygen saturation level.
- the processor 20 in the main instrument receives the electrical output signals from the light sensor and processes them to determine the patient's blood oxygen saturation level. The results of the measurement computations are then displayed on the display 22.
- the computation methods to determine the blood analyte level in the arterial blood are well-known to those skilled in the art, and are not discussed herein.
- an electrical lockout is provided to prevent the light emitters 18 from transmitting high intensity light beams when the probe is detached from the main instrument.
- the probe 12 may include one or more preselected electrical elements which can be detected by the main instrument 10.
- the electrical lockout of the present invention is designed to continuously monitor an absence or presence of such electrical element(s).
- the preselected electrical element is a resistor having a predetermined resistor value.
- the resistor serves a dual purpose. First, the resistor facilitates in determining whether the probe 12 is properly connected. Second, the resistor facilitates in identifying the type of probe. The electrical lockout will continuously interrogate the probe connection and determine whether the detected resistor value falls within predetermined allowable levels. If the detected resistor value falls within the predetermined allowable levels, the value of the resistor is used to identify the type of probe presently being used.
- the probe may be manufactured in various types, each being configured for attaching to a specific part of a patient's body, such as a finger, earlobe, or the nasal septum so as to accommodate variations in size and shape of the patient's appendage. Further, the resistor value may also be used to identify the manufacturer of the probe as well as to identify the type of probe.
- the electrical lockout includes a lockout switch 44 connected serially between the power supply 46 and the light emitters 18 and a feedback detector 42 such as a resistor detector connected to connector port 56 for detecting the value of the resistor in the probe.
- a feedback detector 42 such as a resistor detector connected to connector port 56 for detecting the value of the resistor in the probe.
- the detector 42 may be embodied as a software executed by processor 20 or other logic module.
- the lockout switch 44 may be incorporated into the light emitters 18 as a single integral unit.
- the processor 20 includes an input connected to the output of the resistor detector 42.
- the processor is connected to the lockout switch and provides switch disable and switch enable signals to control the lockout switch. When proper connection is established, the lockout switch remains closed to permit current flow until receiving a switch disable signal from the processor.
- the switch disable signal is provided by the processor to open the lockout switch. It will be appreciated that a detached probe would be perceived at the processor 20 as an open circuit corresponding to an unrecognizable resistor value. It should also be noted that the lockout circuit prevents use of the emitters 18 with an incompatible system having no recognizable resistor value.
- step 100 the resistor detector 42 continuously interrogates the resistor 40 located in the probe 12 to detect the value of the resistor (VR).
- step 105 the processor receives this VR and determines if it is within predetermined allowable levels. If it is, this indicates that the probe head is properly coupled to the main instrument.
- the processor determines the type of probe connected to the main instrument based on the value of the resistor received from the resistor detector. For purposes of obtaining the most accurate measurement, the identified probe type information may be employed to determine the appropriate input light signal to be used to illuminate the patient's appendage and the appropriate computation to be used to process the return signal.
- the processor sends a switch enable signal 52 to the switch 44 to provide a closed circuit between the power supply 46 and the light emitters 18.
- the light emitters 18 remain turned on, and the light signals generated therefrom are transmitted via the optical light guide 28 to the probe 12.
- the light signals are then directed by the light direction guide 36 into the tissue under examination, such as a finger or an earlobe, travel through the tissue, and emerge on the other side of the tissue.
- the transmitted light signals 48 are received by the light sensor 34 and delivered back to the main instrument 10 via the electrical conductor 38.
- the processor unit processes the electrical output signals delivered from the light sensor to determine various blood analyte related values, such as the oxygen saturation level, in the tissue.
- the results of the measurement computations are then displayed on the display.
- a switch disable signal 50 is provided by the processor to open the lockout switch 44 in order to turn off its light sources 18.
- the processor will recognize the value of the resistor detected by the detector and send a switch enable signal to close the lockout switch, allowing current to pass and re-energize the light sources.
- the main instrument includes a circuit or a mechanism for detecting a presence of the light sensor in the probe by checking for the appropriate forward voltage drop on the electrical conductors connected to the light sensor.
- the feedback detector 42 may be a voltage detector used to sense a voltage drop at the probe head. In the event that such interrogations indicate that the probe is not present or is otherwise not prepared for proper functioning, the lockout is employed to inhibit activation of the light sources.
- the family identifier may be replaced by the presence or absence of a bandgap reference.
- the amplitude of the bandgap reference voltage generated within the probe will be used to determine the presence and type of probe.
- the main instrument will interrogate for a voltage drop at certain allowable levels at the probe head.
- the detector 42 may be a voltage detector used to sense a voltage drop at the probe head. If the bandgap reference voltage is below or above the predetermined allowable voltage levels, the processor will send to a switch disenable signal to the lockout switch.
- one or more contacts of the probe connector are used to provide continuity of electrical power (or of a light emitter enable signal to the switch 44) to the light emitters circuitry.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002239318A AU2002239318A1 (en) | 2000-11-15 | 2001-11-13 | Electrical lockout photoplethysmographic measurement system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/712,863 | 2000-11-15 | ||
US09/712,863 US6560470B1 (en) | 2000-11-15 | 2000-11-15 | Electrical lockout photoplethysmographic measurement system |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002051299A2 true WO2002051299A2 (en) | 2002-07-04 |
WO2002051299A3 WO2002051299A3 (en) | 2003-01-16 |
Family
ID=24863858
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2001/043857 WO2002051299A2 (en) | 2000-11-15 | 2001-11-13 | Electrical lockout photoplethysmographic measurement system |
Country Status (3)
Country | Link |
---|---|
US (1) | US6560470B1 (en) |
AU (1) | AU2002239318A1 (en) |
WO (1) | WO2002051299A2 (en) |
Families Citing this family (122)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6018673A (en) | 1996-10-10 | 2000-01-25 | Nellcor Puritan Bennett Incorporated | Motion compatible sensor for non-invasive optical blood analysis |
US7364577B2 (en) | 2002-02-11 | 2008-04-29 | Sherwood Services Ag | Vessel sealing system |
US7901400B2 (en) * | 1998-10-23 | 2011-03-08 | Covidien Ag | Method and system for controlling output of RF medical generator |
US7137980B2 (en) | 1998-10-23 | 2006-11-21 | Sherwood Services Ag | Method and system for controlling output of RF medical generator |
US6675031B1 (en) | 1999-04-14 | 2004-01-06 | Mallinckrodt Inc. | Method and circuit for indicating quality and accuracy of physiological measurements |
US6748254B2 (en) | 2001-10-12 | 2004-06-08 | Nellcor Puritan Bennett Incorporated | Stacked adhesive optical sensor |
WO2003092520A1 (en) * | 2002-05-06 | 2003-11-13 | Sherwood Services Ag | Blood detector for controlling anesu and method therefor |
US7190986B1 (en) | 2002-10-18 | 2007-03-13 | Nellcor Puritan Bennett Inc. | Non-adhesive oximeter sensor for sensitive skin |
US7044948B2 (en) | 2002-12-10 | 2006-05-16 | Sherwood Services Ag | Circuit for controlling arc energy from an electrosurgical generator |
US7722601B2 (en) * | 2003-05-01 | 2010-05-25 | Covidien Ag | Method and system for programming and controlling an electrosurgical generator system |
US8104956B2 (en) * | 2003-10-23 | 2012-01-31 | Covidien Ag | Thermocouple measurement circuit |
US7396336B2 (en) | 2003-10-30 | 2008-07-08 | Sherwood Services Ag | Switched resonant ultrasonic power amplifier system |
US7131860B2 (en) | 2003-11-20 | 2006-11-07 | Sherwood Services Ag | Connector systems for electrosurgical generator |
US7766905B2 (en) | 2004-02-12 | 2010-08-03 | Covidien Ag | Method and system for continuity testing of medical electrodes |
US7120480B2 (en) * | 2004-02-25 | 2006-10-10 | Nellcor Puritan Bennett Inc. | LED forward voltage estimation in pulse oximeter |
US7194293B2 (en) | 2004-03-08 | 2007-03-20 | Nellcor Puritan Bennett Incorporated | Selection of ensemble averaging weights for a pulse oximeter based on signal quality metrics |
US7628786B2 (en) | 2004-10-13 | 2009-12-08 | Covidien Ag | Universal foot switch contact port |
US9474564B2 (en) | 2005-03-31 | 2016-10-25 | Covidien Ag | Method and system for compensating for external impedance of an energy carrying component when controlling an electrosurgical generator |
US7386333B1 (en) * | 2005-04-29 | 2008-06-10 | Henryk Birecki | Test subject monitoring device |
US7657295B2 (en) | 2005-08-08 | 2010-02-02 | Nellcor Puritan Bennett Llc | Medical sensor and technique for using the same |
US7657294B2 (en) | 2005-08-08 | 2010-02-02 | Nellcor Puritan Bennett Llc | Compliant diaphragm medical sensor and technique for using the same |
US7590439B2 (en) | 2005-08-08 | 2009-09-15 | Nellcor Puritan Bennett Llc | Bi-stable medical sensor and technique for using the same |
US20070060808A1 (en) | 2005-09-12 | 2007-03-15 | Carine Hoarau | Medical sensor for reducing motion artifacts and technique for using the same |
US7904130B2 (en) | 2005-09-29 | 2011-03-08 | Nellcor Puritan Bennett Llc | Medical sensor and technique for using the same |
US8092379B2 (en) | 2005-09-29 | 2012-01-10 | Nellcor Puritan Bennett Llc | Method and system for determining when to reposition a physiological sensor |
US7869850B2 (en) | 2005-09-29 | 2011-01-11 | Nellcor Puritan Bennett Llc | Medical sensor for reducing motion artifacts and technique for using the same |
US7899510B2 (en) | 2005-09-29 | 2011-03-01 | Nellcor Puritan Bennett Llc | Medical sensor and technique for using the same |
US8233954B2 (en) | 2005-09-30 | 2012-07-31 | Nellcor Puritan Bennett Llc | Mucosal sensor for the assessment of tissue and blood constituents and technique for using the same |
US7555327B2 (en) | 2005-09-30 | 2009-06-30 | Nellcor Puritan Bennett Llc | Folding medical sensor and technique for using the same |
US7483731B2 (en) | 2005-09-30 | 2009-01-27 | Nellcor Puritan Bennett Llc | Medical sensor and technique for using the same |
US7881762B2 (en) | 2005-09-30 | 2011-02-01 | Nellcor Puritan Bennett Llc | Clip-style medical sensor and technique for using the same |
US8062221B2 (en) | 2005-09-30 | 2011-11-22 | Nellcor Puritan Bennett Llc | Sensor for tissue gas detection and technique for using the same |
US7486979B2 (en) | 2005-09-30 | 2009-02-03 | Nellcor Puritan Bennett Llc | Optically aligned pulse oximetry sensor and technique for using the same |
US8734438B2 (en) | 2005-10-21 | 2014-05-27 | Covidien Ag | Circuit and method for reducing stored energy in an electrosurgical generator |
US7947039B2 (en) | 2005-12-12 | 2011-05-24 | Covidien Ag | Laparoscopic apparatus for performing electrosurgical procedures |
US7918582B2 (en) * | 2005-12-30 | 2011-04-05 | Dialight Corporation | Signal light using phosphor coated LEDs |
WO2007079423A2 (en) * | 2005-12-30 | 2007-07-12 | Dialight Corporation | Method and apparatus for providing a light source that combines different color leds |
US8216223B2 (en) | 2006-01-24 | 2012-07-10 | Covidien Ag | System and method for tissue sealing |
CA2574935A1 (en) | 2006-01-24 | 2007-07-24 | Sherwood Services Ag | A method and system for controlling an output of a radio-frequency medical generator having an impedance based control algorithm |
US8685016B2 (en) | 2006-01-24 | 2014-04-01 | Covidien Ag | System and method for tissue sealing |
CA2574934C (en) | 2006-01-24 | 2015-12-29 | Sherwood Services Ag | System and method for closed loop monitoring of monopolar electrosurgical apparatus |
CA2575392C (en) | 2006-01-24 | 2015-07-07 | Sherwood Services Ag | System and method for tissue sealing |
US7513896B2 (en) | 2006-01-24 | 2009-04-07 | Covidien Ag | Dual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling |
US8147485B2 (en) | 2006-01-24 | 2012-04-03 | Covidien Ag | System and method for tissue sealing |
US9186200B2 (en) | 2006-01-24 | 2015-11-17 | Covidien Ag | System and method for tissue sealing |
US7651493B2 (en) | 2006-03-03 | 2010-01-26 | Covidien Ag | System and method for controlling electrosurgical snares |
US7648499B2 (en) | 2006-03-21 | 2010-01-19 | Covidien Ag | System and method for generating radio frequency energy |
US7651492B2 (en) | 2006-04-24 | 2010-01-26 | Covidien Ag | Arc based adaptive control system for an electrosurgical unit |
US8073518B2 (en) | 2006-05-02 | 2011-12-06 | Nellcor Puritan Bennett Llc | Clip-style medical sensor and technique for using the same |
US8753334B2 (en) | 2006-05-10 | 2014-06-17 | Covidien Ag | System and method for reducing leakage current in an electrosurgical generator |
US8034049B2 (en) * | 2006-08-08 | 2011-10-11 | Covidien Ag | System and method for measuring initial tissue impedance |
US7731717B2 (en) * | 2006-08-08 | 2010-06-08 | Covidien Ag | System and method for controlling RF output during tissue sealing |
US8145288B2 (en) | 2006-08-22 | 2012-03-27 | Nellcor Puritan Bennett Llc | Medical sensor for reducing signal artifacts and technique for using the same |
US8219170B2 (en) | 2006-09-20 | 2012-07-10 | Nellcor Puritan Bennett Llc | System and method for practicing spectrophotometry using light emitting nanostructure devices |
US8396527B2 (en) | 2006-09-22 | 2013-03-12 | Covidien Lp | Medical sensor for reducing signal artifacts and technique for using the same |
US8190224B2 (en) | 2006-09-22 | 2012-05-29 | Nellcor Puritan Bennett Llc | Medical sensor for reducing signal artifacts and technique for using the same |
US8175671B2 (en) | 2006-09-22 | 2012-05-08 | Nellcor Puritan Bennett Llc | Medical sensor for reducing signal artifacts and technique for using the same |
US7869849B2 (en) | 2006-09-26 | 2011-01-11 | Nellcor Puritan Bennett Llc | Opaque, electrically nonconductive region on a medical sensor |
US7574245B2 (en) | 2006-09-27 | 2009-08-11 | Nellcor Puritan Bennett Llc | Flexible medical sensor enclosure |
US7890153B2 (en) | 2006-09-28 | 2011-02-15 | Nellcor Puritan Bennett Llc | System and method for mitigating interference in pulse oximetry |
US7794457B2 (en) | 2006-09-28 | 2010-09-14 | Covidien Ag | Transformer for RF voltage sensing |
US7796403B2 (en) | 2006-09-28 | 2010-09-14 | Nellcor Puritan Bennett Llc | Means for mechanical registration and mechanical-electrical coupling of a faraday shield to a photodetector and an electrical circuit |
US7680522B2 (en) | 2006-09-29 | 2010-03-16 | Nellcor Puritan Bennett Llc | Method and apparatus for detecting misapplied sensors |
US8175667B2 (en) | 2006-09-29 | 2012-05-08 | Nellcor Puritan Bennett Llc | Symmetric LED array for pulse oximetry |
US8068891B2 (en) | 2006-09-29 | 2011-11-29 | Nellcor Puritan Bennett Llc | Symmetric LED array for pulse oximetry |
US7684842B2 (en) | 2006-09-29 | 2010-03-23 | Nellcor Puritan Bennett Llc | System and method for preventing sensor misuse |
US7476131B2 (en) | 2006-09-29 | 2009-01-13 | Nellcor Puritan Bennett Llc | Device for reducing crosstalk |
US8280469B2 (en) | 2007-03-09 | 2012-10-02 | Nellcor Puritan Bennett Llc | Method for detection of aberrant tissue spectra |
US7894869B2 (en) | 2007-03-09 | 2011-02-22 | Nellcor Puritan Bennett Llc | Multiple configuration medical sensor and technique for using the same |
US8221326B2 (en) | 2007-03-09 | 2012-07-17 | Nellcor Puritan Bennett Llc | Detection of oximetry sensor sites based on waveform characteristics |
US8265724B2 (en) | 2007-03-09 | 2012-09-11 | Nellcor Puritan Bennett Llc | Cancellation of light shunting |
US8777941B2 (en) | 2007-05-10 | 2014-07-15 | Covidien Lp | Adjustable impedance electrosurgical electrodes |
US7834484B2 (en) | 2007-07-16 | 2010-11-16 | Tyco Healthcare Group Lp | Connection cable and method for activating a voltage-controlled generator |
US8216220B2 (en) | 2007-09-07 | 2012-07-10 | Tyco Healthcare Group Lp | System and method for transmission of combined data stream |
US8512332B2 (en) | 2007-09-21 | 2013-08-20 | Covidien Lp | Real-time arc control in electrosurgical generators |
US8346328B2 (en) | 2007-12-21 | 2013-01-01 | Covidien Lp | Medical sensor and technique for using the same |
US8352004B2 (en) | 2007-12-21 | 2013-01-08 | Covidien Lp | Medical sensor and technique for using the same |
US8366613B2 (en) | 2007-12-26 | 2013-02-05 | Covidien Lp | LED drive circuit for pulse oximetry and method for using same |
US8577434B2 (en) | 2007-12-27 | 2013-11-05 | Covidien Lp | Coaxial LED light sources |
US8452364B2 (en) | 2007-12-28 | 2013-05-28 | Covidien LLP | System and method for attaching a sensor to a patient's skin |
US8442608B2 (en) | 2007-12-28 | 2013-05-14 | Covidien Lp | System and method for estimating physiological parameters by deconvolving artifacts |
US8092993B2 (en) | 2007-12-31 | 2012-01-10 | Nellcor Puritan Bennett Llc | Hydrogel thin film for use as a biosensor |
US8897850B2 (en) | 2007-12-31 | 2014-11-25 | Covidien Lp | Sensor with integrated living hinge and spring |
US8199007B2 (en) | 2007-12-31 | 2012-06-12 | Nellcor Puritan Bennett Llc | Flex circuit snap track for a biometric sensor |
US8070508B2 (en) | 2007-12-31 | 2011-12-06 | Nellcor Puritan Bennett Llc | Method and apparatus for aligning and securing a cable strain relief |
US8437822B2 (en) | 2008-03-28 | 2013-05-07 | Covidien Lp | System and method for estimating blood analyte concentration |
US8112375B2 (en) | 2008-03-31 | 2012-02-07 | Nellcor Puritan Bennett Llc | Wavelength selection and outlier detection in reduced rank linear models |
US8226639B2 (en) | 2008-06-10 | 2012-07-24 | Tyco Healthcare Group Lp | System and method for output control of electrosurgical generator |
US8071935B2 (en) | 2008-06-30 | 2011-12-06 | Nellcor Puritan Bennett Llc | Optical detector with an overmolded faraday shield |
US7887345B2 (en) | 2008-06-30 | 2011-02-15 | Nellcor Puritan Bennett Llc | Single use connector for pulse oximetry sensors |
US7880884B2 (en) | 2008-06-30 | 2011-02-01 | Nellcor Puritan Bennett Llc | System and method for coating and shielding electronic sensor components |
US8364220B2 (en) | 2008-09-25 | 2013-01-29 | Covidien Lp | Medical sensor and technique for using the same |
US8417309B2 (en) | 2008-09-30 | 2013-04-09 | Covidien Lp | Medical sensor |
US8423112B2 (en) | 2008-09-30 | 2013-04-16 | Covidien Lp | Medical sensor and technique for using the same |
US8914088B2 (en) | 2008-09-30 | 2014-12-16 | Covidien Lp | Medical sensor and technique for using the same |
DE102009013396B3 (en) * | 2009-03-16 | 2010-08-05 | Dräger Medical AG & Co. KG | Apparatus and method for controlling the oxygen dosage of a ventilator |
US8771204B2 (en) | 2008-12-30 | 2014-07-08 | Masimo Corporation | Acoustic sensor assembly |
US8262652B2 (en) | 2009-01-12 | 2012-09-11 | Tyco Healthcare Group Lp | Imaginary impedance process monitoring and intelligent shut-off |
US8452366B2 (en) | 2009-03-16 | 2013-05-28 | Covidien Lp | Medical monitoring device with flexible circuitry |
US8221319B2 (en) | 2009-03-25 | 2012-07-17 | Nellcor Puritan Bennett Llc | Medical device for assessing intravascular blood volume and technique for using the same |
US8509869B2 (en) | 2009-05-15 | 2013-08-13 | Covidien Lp | Method and apparatus for detecting and analyzing variations in a physiologic parameter |
US8634891B2 (en) | 2009-05-20 | 2014-01-21 | Covidien Lp | Method and system for self regulation of sensor component contact pressure |
US8505821B2 (en) | 2009-06-30 | 2013-08-13 | Covidien Lp | System and method for providing sensor quality assurance |
US9010634B2 (en) | 2009-06-30 | 2015-04-21 | Covidien Lp | System and method for linking patient data to a patient and providing sensor quality assurance |
US8311601B2 (en) | 2009-06-30 | 2012-11-13 | Nellcor Puritan Bennett Llc | Reflectance and/or transmissive pulse oximeter |
US8391941B2 (en) | 2009-07-17 | 2013-03-05 | Covidien Lp | System and method for memory switching for multiple configuration medical sensor |
US8417310B2 (en) | 2009-08-10 | 2013-04-09 | Covidien Lp | Digital switching in multi-site sensor |
US8428675B2 (en) | 2009-08-19 | 2013-04-23 | Covidien Lp | Nanofiber adhesives used in medical devices |
US8790268B2 (en) | 2009-10-15 | 2014-07-29 | Masimo Corporation | Bidirectional physiological information display |
US8690799B2 (en) | 2009-10-15 | 2014-04-08 | Masimo Corporation | Acoustic respiratory monitoring sensor having multiple sensing elements |
US10463340B2 (en) * | 2009-10-15 | 2019-11-05 | Masimo Corporation | Acoustic respiratory monitoring systems and methods |
US9386931B2 (en) | 2010-03-31 | 2016-07-12 | Covidien Lp | System and method for receiving an indication of proper body locations of sensors on a patient |
US9579150B2 (en) | 2011-04-08 | 2017-02-28 | Covidien Lp | Microwave ablation instrument with interchangeable antenna probe |
US9955937B2 (en) | 2012-09-20 | 2018-05-01 | Masimo Corporation | Acoustic patient sensor coupler |
US8922788B2 (en) | 2012-12-22 | 2014-12-30 | Covidien Lp | Methods and systems for determining a probe-off condition in a medical device |
US9560995B2 (en) | 2013-02-25 | 2017-02-07 | Covidien Lp | Methods and systems for determining a probe-off condition in a medical device |
US9211161B2 (en) * | 2013-03-06 | 2015-12-15 | DePuy Synthes Products, Inc. | Apparatus and methods for associating medical probes with connection ports |
US9872719B2 (en) | 2013-07-24 | 2018-01-23 | Covidien Lp | Systems and methods for generating electrosurgical energy using a multistage power converter |
US9636165B2 (en) | 2013-07-29 | 2017-05-02 | Covidien Lp | Systems and methods for measuring tissue impedance through an electrosurgical cable |
US10828007B1 (en) | 2013-10-11 | 2020-11-10 | Masimo Corporation | Acoustic sensor with attachment portion |
US9456808B2 (en) * | 2014-09-25 | 2016-10-04 | Hologic, Inc. | Biopsy device with automatic biopsy parameter adjustment |
US10405782B2 (en) | 2016-10-18 | 2019-09-10 | Kestrel Labs, Inc. | Photoplethysmographic device with mechanically-protected sensor connector |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3894532A (en) * | 1974-01-17 | 1975-07-15 | Acupulse Inc | Instruments for transcutaneous and subcutaneous investigation and treatment |
US4441027A (en) * | 1981-08-03 | 1984-04-03 | Baxter Travenol Laboratories, Inc. | Liquid level controller for a respiratory gas humidifier device |
US4776339A (en) * | 1987-03-05 | 1988-10-11 | N.A.D., Inc. | Interlock for oxygen saturation monitor anesthesia apparatus |
US5282466A (en) * | 1991-10-03 | 1994-02-01 | Medtronic, Inc. | System for disabling oximeter in presence of ambient light |
US6387092B1 (en) * | 1999-09-07 | 2002-05-14 | Scimed Life Systems, Inc. | Systems and methods to identify and disable re-used single use devices based on time elapsed from first therapeutic use |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5193543A (en) | 1986-12-12 | 1993-03-16 | Critikon, Inc. | Method and apparatus for measuring arterial blood constituents |
USRE33643E (en) | 1987-04-30 | 1991-07-23 | Nonin Medical, Inc. | Pulse oximeter with circuit leakage and ambient light compensation |
US4846183A (en) | 1987-12-02 | 1989-07-11 | The Boc Group, Inc. | Blood parameter monitoring apparatus and methods |
EP0401453B1 (en) | 1989-05-23 | 1992-09-02 | Biosensors Technology, Inc. | Method for determining by absorption of radiations the concentration of substances in absorbing and turbid matrices |
AU8411691A (en) | 1990-08-29 | 1992-03-30 | Theodore E. Cadell | Finger receptor |
JP3310390B2 (en) | 1993-06-10 | 2002-08-05 | 浜松ホトニクス株式会社 | Method and apparatus for measuring concentration of light absorbing substance in scattering medium |
-
2000
- 2000-11-15 US US09/712,863 patent/US6560470B1/en not_active Expired - Fee Related
-
2001
- 2001-11-13 AU AU2002239318A patent/AU2002239318A1/en not_active Abandoned
- 2001-11-13 WO PCT/US2001/043857 patent/WO2002051299A2/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3894532A (en) * | 1974-01-17 | 1975-07-15 | Acupulse Inc | Instruments for transcutaneous and subcutaneous investigation and treatment |
US4441027A (en) * | 1981-08-03 | 1984-04-03 | Baxter Travenol Laboratories, Inc. | Liquid level controller for a respiratory gas humidifier device |
US4776339A (en) * | 1987-03-05 | 1988-10-11 | N.A.D., Inc. | Interlock for oxygen saturation monitor anesthesia apparatus |
US5282466A (en) * | 1991-10-03 | 1994-02-01 | Medtronic, Inc. | System for disabling oximeter in presence of ambient light |
US6387092B1 (en) * | 1999-09-07 | 2002-05-14 | Scimed Life Systems, Inc. | Systems and methods to identify and disable re-used single use devices based on time elapsed from first therapeutic use |
Also Published As
Publication number | Publication date |
---|---|
US6560470B1 (en) | 2003-05-06 |
AU2002239318A1 (en) | 2002-07-08 |
WO2002051299A3 (en) | 2003-01-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6560470B1 (en) | Electrical lockout photoplethysmographic measurement system | |
US6697656B1 (en) | Pulse oximetry sensor compatible with multiple pulse oximetry systems | |
US7272425B2 (en) | Pulse oximetry sensor including stored sensor data | |
US8000761B2 (en) | Resposable pulse oximetry sensor | |
EP0871396B1 (en) | Method and apparatus for facilitating compatibility between pulse oximeters and sensor probes | |
Alexander et al. | Principles of pulse oximetry: theoretical and practical considerations | |
US6771994B2 (en) | Pulse oximeter probe-off detection system | |
US5357954A (en) | Optical blood oxygen saturation probe for insertion into the esophagus | |
US9364181B2 (en) | Physiological sensor combination | |
US7438683B2 (en) | Application identification sensor | |
US20050234317A1 (en) | Low power and personal pulse oximetry systems | |
US20030156288A1 (en) | Sensor band for aligning an emitter and a detector | |
US20110152645A1 (en) | Pulse oximetry sensor adapter | |
US20140303494A1 (en) | Needle guidance system | |
WO1999043256A1 (en) | Segmented photoplethysmographic sensor with universal probe-end | |
WO2000002483A2 (en) | Fetal pulse oximetry sensor | |
WO2013056243A1 (en) | Needle guidance system | |
CN116528760A (en) | Reducing optical shunt in medical sensors using optically absorbing materials |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PH PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
AK | Designated states |
Kind code of ref document: A3 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PH PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A3 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
122 | Ep: pct application non-entry in european phase | ||
NENP | Non-entry into the national phase |
Ref country code: JP |
|
WWW | Wipo information: withdrawn in national office |
Country of ref document: JP |