CA2148714C - Systems for identifying catheters and monitoring their use - Google Patents
Systems for identifying catheters and monitoring their use Download PDFInfo
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- CA2148714C CA2148714C CA002148714A CA2148714A CA2148714C CA 2148714 C CA2148714 C CA 2148714C CA 002148714 A CA002148714 A CA 002148714A CA 2148714 A CA2148714 A CA 2148714A CA 2148714 C CA2148714 C CA 2148714C
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- catheter
- generator
- control signal
- identification code
- electrodes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
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- A61B18/14—Probes or electrodes therefor
- A61B18/1492—Probes or electrodes therefor having a flexible, catheter-like structure, e.g. for heart ablation
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Abstract
A catheter (14) carries a functional component (16), like an ablating electrode, having a predetermined operating character-istic. The catheter (14) also electronically retains an identification code that uniquely identifies the predetermined characteristic.
The catheter (14) is capable of transmitting the identification code to an external reader in response to a predetermined prompt.
An associated apparatus, like an ablating energy source (12), reads the identification code and compares it to predetermined op-erating criteria. The apparatus (12) will not permit interaction with the functional catheter component (16) if the identification code indicates that the functional characteristics of the catheter (14) are not suited for the intended interaction. The catheter (14) can also store usage information to prevent reuse.
The catheter (14) is capable of transmitting the identification code to an external reader in response to a predetermined prompt.
An associated apparatus, like an ablating energy source (12), reads the identification code and compares it to predetermined op-erating criteria. The apparatus (12) will not permit interaction with the functional catheter component (16) if the identification code indicates that the functional characteristics of the catheter (14) are not suited for the intended interaction. The catheter (14) can also store usage information to prevent reuse.
Description
:v WO 94/10921 PCT/US93/10902 SYSTEMS FOR IDENTIFYING CATHETERS
1~ND MONITORING THEIR USE
Field of the Invention The invention generally relates to catheters and associated power sources. Tn a more specific sense, the invention relates to ablation catheters and ablation methods that transmit energy to form lesions for therapeutic purposes.
Backuround of the Invention 1 Physicians make use of catheters today in medical procedures to gain access into interior regions of the body to ablate targeted tissue areas.
Tt is important for the physician to control carefully and precisely the emission of energy within the body used to ablate the tissue.
The need for careful and precise control over the catheter is especially critical during procedures that ablate tissue within the heart.
These procedures, called electrophysiological therapy, are becoming more widespread for treating cardiac rhythm disturbances.
During these procedures, a physician steers a catheter through a main vein or artery (which is typically the femoral vein or artery) into the interior region of the heart that is to be treated.
2v~~'7 ~.r WO 94/10921 PCI'/US93/10902 The physician then further manipulates a steering mechanism to place the electrode carried on the dis-tal tip of the catheter into direct contact with the tissue that is to be ablated. The physician directs radio frequency energy from the electrode tip through tissue to an indifferent electrode to ablate the tissue and form a lesion.
Cardiac ablation especially requires the ability to precisely monitor and control the emis sion of energy from the ablation electrode.
Summary of the Invention The invention provides systems and ap-paratus for identifying catheters and monitoring their use.
One aspect of the invention provides a catheter including a body carrying a functional com-ponent, like an ablating electrode, having a predetermined operating characteristic. The body also carries electronic means for retaining an iden-tification code that uniquely identifies the predetenained operating characteristic of the functional component. The electronic retaining means includes an output for transmitting the iden-tification code to an external reader in response to a predetermined prompt.
Another aspect of the invention provides a catheter with a functional component, like an ablating electrode. In this aspect of the inven-tion, the body also carries electronic means for retaining a code that represents the usage of the functional component. The electronic retaining means includes an output for generating the usage code in response to a predetermined prompt and an input for updating the usage code in response to use of the functional component.
1~ND MONITORING THEIR USE
Field of the Invention The invention generally relates to catheters and associated power sources. Tn a more specific sense, the invention relates to ablation catheters and ablation methods that transmit energy to form lesions for therapeutic purposes.
Backuround of the Invention 1 Physicians make use of catheters today in medical procedures to gain access into interior regions of the body to ablate targeted tissue areas.
Tt is important for the physician to control carefully and precisely the emission of energy within the body used to ablate the tissue.
The need for careful and precise control over the catheter is especially critical during procedures that ablate tissue within the heart.
These procedures, called electrophysiological therapy, are becoming more widespread for treating cardiac rhythm disturbances.
During these procedures, a physician steers a catheter through a main vein or artery (which is typically the femoral vein or artery) into the interior region of the heart that is to be treated.
2v~~'7 ~.r WO 94/10921 PCI'/US93/10902 The physician then further manipulates a steering mechanism to place the electrode carried on the dis-tal tip of the catheter into direct contact with the tissue that is to be ablated. The physician directs radio frequency energy from the electrode tip through tissue to an indifferent electrode to ablate the tissue and form a lesion.
Cardiac ablation especially requires the ability to precisely monitor and control the emis sion of energy from the ablation electrode.
Summary of the Invention The invention provides systems and ap-paratus for identifying catheters and monitoring their use.
One aspect of the invention provides a catheter including a body carrying a functional com-ponent, like an ablating electrode, having a predetermined operating characteristic. The body also carries electronic means for retaining an iden-tification code that uniquely identifies the predetenained operating characteristic of the functional component. The electronic retaining means includes an output for transmitting the iden-tification code to an external reader in response to a predetermined prompt.
Another aspect of the invention provides a catheter with a functional component, like an ablating electrode. In this aspect of the inven-tion, the body also carries electronic means for retaining a code that represents the usage of the functional component. The electronic retaining means includes an output for generating the usage code in response to a predetermined prompt and an input for updating the usage code in response to use of the functional component.
Another aspect of the invention provides an apparatus for interacting with the functional component of the catheter. The apparatus includes a mechanism that prompts the electronic retaining means of the catheter to generate its identification code. The apparatus also stores predetermined criteria governing its interaction with the catheter. The apparatus compares the generated identification code to the predetermined interaction criteria. The apparatus generates a first control signal when the generated identification code meets the predetermined interaction criteria. The apparatus generates a second control signal, different than the first control signal, when the generated identification code does not meet the predetermined interaction criteria.
In one embodiment, the apparatus will not permit the intended interaction with the functional catheter component, if the identification code indicates that the catheter has been used too many times or if the functional characteristics of the catheter are not suited for the intended interaction.
In a preferred embodiment, the functional catheter component is an ablating electrode, and the apparatus is a source of ablating energy. In this embodiment, the apparatus sets the operating ablating power conditions depending upon the particular functional characteristics of the associated ablating electrode. In this way, the apparatus distinguishes among ablating electrodes of different functional characteristics and supplies ablating power accordingly.
In another aspect the invention provides a catheter system, comprising a catheter having one or more 3a tissue ablation electrodes, and a stored electronic identification code that identifies one or more operating characteristics of the catheter; and a generator connectable to the catheter, wherein the generator is configured to sense the identification code when the catheter is connected thereto.
According to another aspect the invention provides a catheter device, comprising: a guide body; one or more tissue ablation electrodes mounted on the guide body; a memory device associated with the guide body; and an electronic identification code stored in the memory device, the identification code identifying one or more operating characteristics of the catheter device.
According to yet another aspect the invention provides a catheter system, comprising a catheter having one or more tissue ablation electrodes, and a stored electronic usage value representing the number of times the one or more electrodes has been used; and a generator connectable to the catheter, wherein the generator is configured to sense the stored usage value when the catheter is connected thereto.
According to still another aspect the invention provides a catheter device, comprising: a guide body; one or more tissue ablation electrodes mounted on the guide body; a memory device associated with the guide body; and an electronic usage value stored in the memory device, the usage value representing the number of times the one or more electrodes has been used.
The invention may be embodied in several forms without departing from its spirit or essential ~~ ~, /~.
In one embodiment, the apparatus will not permit the intended interaction with the functional catheter component, if the identification code indicates that the catheter has been used too many times or if the functional characteristics of the catheter are not suited for the intended interaction.
In a preferred embodiment, the functional catheter component is an ablating electrode, and the apparatus is a source of ablating energy. In this embodiment, the apparatus sets the operating ablating power conditions depending upon the particular functional characteristics of the associated ablating electrode. In this way, the apparatus distinguishes among ablating electrodes of different functional characteristics and supplies ablating power accordingly.
In another aspect the invention provides a catheter system, comprising a catheter having one or more 3a tissue ablation electrodes, and a stored electronic identification code that identifies one or more operating characteristics of the catheter; and a generator connectable to the catheter, wherein the generator is configured to sense the identification code when the catheter is connected thereto.
According to another aspect the invention provides a catheter device, comprising: a guide body; one or more tissue ablation electrodes mounted on the guide body; a memory device associated with the guide body; and an electronic identification code stored in the memory device, the identification code identifying one or more operating characteristics of the catheter device.
According to yet another aspect the invention provides a catheter system, comprising a catheter having one or more tissue ablation electrodes, and a stored electronic usage value representing the number of times the one or more electrodes has been used; and a generator connectable to the catheter, wherein the generator is configured to sense the stored usage value when the catheter is connected thereto.
According to still another aspect the invention provides a catheter device, comprising: a guide body; one or more tissue ablation electrodes mounted on the guide body; a memory device associated with the guide body; and an electronic usage value stored in the memory device, the usage value representing the number of times the one or more electrodes has been used.
The invention may be embodied in several forms without departing from its spirit or essential ~~ ~, /~.
characteristics. The scope of the invention is defined in the appended claims, rather than in the ", specific description preceding them. All em-bodiments that fall within the meaning and range of equivalency of the claims axe therefore intended to be embraced by the claims.
Brief Description of the Drawincts Fig. 1 is a perspective view of a system for ablating tissue that embodies the features of the invention:
Fig. 2 is a schematic view of the generator and associated monitor and control circuits for the system:
Fig. 3 is a schematic view of the power monitor and control circuit for the system:
Fig. 4 is a schematic view of a catheter identification circuit that enables or prevents use of the catheter based upon functional and perfor-mance criteria; and Fig. 5 is a schematic view of a catheter identification circuit that enables or prevents use of the catheter based upon prior use criteria.
Description of the Preferred Embodiments Fig. 1 shows a system l0 for performing ab lation on human tissue that embodies the features of the invention. ~ The system 10 includes a radiofrequency generator 12 that delivers radiofre quency energy. The system 10 also includes a steerable catheter 14 carrying a radiofrequency emitting tip electrode 16.
In the illustrated embodiment, the system 10 operates in a monopolar mode. In this arran-gement, the system l0 includes a skin patch electrode that serves as an indifferent second electrode 18. In use, the indifferent electrode 18 attaches to the patient s back or other exterior skin area.
Alternatively, the system 10 can be operated in a bipolar mode. In this mode, the 5 catheter 14 carries both electrodes.
In the illustrated embodiment, the ablation electrode 16 and indifferent electrodes 18 are made of platinum.
The system 10 can be used in many different environments. This specification describes the sys tem 10 when used to provide cardiac ablation therapy.
When used for this purpose, a physician steers the catheter l4 through a main vein or artery (typically the femoral vein or artery) into the interior region of the heart that is to be treated.
The physician then further manipulates the catheter 14 to place the tip electrode 16 into contact with the tissue within the heart that is targeted for ablation. The user directs radio frequency energy from the generator 12 into the tip electrode 16 to form a lesion on the contacted tissue.
In the embodiment shown in Fig.l, the catheter 14 includes a handle 20, a guide tube 22, and a tip 24, which carries the tip electrode 16 (which also will be called the ablation electrode).
The handle 20 enoloses a steering mechanism 26 far the catheter tip 24. A cable 28 extending from the rear of the handle 20 has plugs (not shown). The plugs connect the catheter 14 to the generator 12 for conveying radiofrequency energy to the ablation electrode 16. The radiofrequency energy heats the tissue to form the lesion.
Left and right steering wires (not shown) extend through the guide tube 22 to interconnect the 2~1~ ~~ ~.!?
Brief Description of the Drawincts Fig. 1 is a perspective view of a system for ablating tissue that embodies the features of the invention:
Fig. 2 is a schematic view of the generator and associated monitor and control circuits for the system:
Fig. 3 is a schematic view of the power monitor and control circuit for the system:
Fig. 4 is a schematic view of a catheter identification circuit that enables or prevents use of the catheter based upon functional and perfor-mance criteria; and Fig. 5 is a schematic view of a catheter identification circuit that enables or prevents use of the catheter based upon prior use criteria.
Description of the Preferred Embodiments Fig. 1 shows a system l0 for performing ab lation on human tissue that embodies the features of the invention. ~ The system 10 includes a radiofrequency generator 12 that delivers radiofre quency energy. The system 10 also includes a steerable catheter 14 carrying a radiofrequency emitting tip electrode 16.
In the illustrated embodiment, the system 10 operates in a monopolar mode. In this arran-gement, the system l0 includes a skin patch electrode that serves as an indifferent second electrode 18. In use, the indifferent electrode 18 attaches to the patient s back or other exterior skin area.
Alternatively, the system 10 can be operated in a bipolar mode. In this mode, the 5 catheter 14 carries both electrodes.
In the illustrated embodiment, the ablation electrode 16 and indifferent electrodes 18 are made of platinum.
The system 10 can be used in many different environments. This specification describes the sys tem 10 when used to provide cardiac ablation therapy.
When used for this purpose, a physician steers the catheter l4 through a main vein or artery (typically the femoral vein or artery) into the interior region of the heart that is to be treated.
The physician then further manipulates the catheter 14 to place the tip electrode 16 into contact with the tissue within the heart that is targeted for ablation. The user directs radio frequency energy from the generator 12 into the tip electrode 16 to form a lesion on the contacted tissue.
In the embodiment shown in Fig.l, the catheter 14 includes a handle 20, a guide tube 22, and a tip 24, which carries the tip electrode 16 (which also will be called the ablation electrode).
The handle 20 enoloses a steering mechanism 26 far the catheter tip 24. A cable 28 extending from the rear of the handle 20 has plugs (not shown). The plugs connect the catheter 14 to the generator 12 for conveying radiofrequency energy to the ablation electrode 16. The radiofrequency energy heats the tissue to form the lesion.
Left and right steering wires (not shown) extend through the guide tube 22 to interconnect the 2~1~ ~~ ~.!?
steering mechanism 26 to the left and right sides of the tip 24. Rotating the steering mechanism 26 to the left pulls on the left steering wire, causing the tip 24 to bend to the left. Also, rotating the steering mechanism 26 to the right pulls on the right steering wire, causing the tip 24 to bend to the right. Tn this way, the physician steers the ablation electrode 16 into contact with the tissue to be ablated.
The generator 12 includes a radiofrequency power source 30 connected through a main isolation transformer 32 to first and second conducting lines 34 and 36.
In the illustrated environment, the power source 30 delivers up to 50 watts of power at a fre quency of 500 kHz. The first conducting line 34 leads to the ablation electrode 16.. The second con ducting line 36 leads to the indifferent patch electrode 18.
As Figs. 2 and 3 show, the system l0 includes first monitoring means 38 for measuring the radiofrequency current and radiofrequency voltage delivered by the generator i2 to the patient. The first monitoring means 38 also derives control sig-. nals indicative of RMS (root mean squared) voltage (in volts), RMS current (in amps), and actual phase sensitive power (in watts) to support other control functions of the generator 12.
The first monitoring means 38 may be variously configured and constructed. In the iI
lustrated embodiment, the first monitoring means 38 includes currant monitoring means 40 for measuring the radiofrequency current passing from the first line 34 through the tissue to the second line 36 (i.e., from the ablation electrode 16 to the indif-~C ~ r,7 WO 94/10921 ~ '~ r '~ ~ ~~ ~' PCT/US93/10902 ferent patch electrode 18).
The first monitoring means 38 also includes voltage monitoring means 42. The voltage monitoring means 42 measures the radiofrequency voltage generated between the first and second conducting lines 34 and 36 (i.e., between the ablation electrode 16 and the indifferent patch electrode 18) .
The first monitoring means 38 includes three control outputs 44, 46, and 48.
The first control output 44 carries a sig-nal representative of RMS current conducted by the ablation electrode 16.
The second control output 46 carries a sig nal representative of the RMS voltage between the ablation electrode 16 and the indifferent patch electrode 18.
The third control output 48 carries a sig nal representative of actual phase sensitive power transmitted by the ablation electrode 16.
In the illustrated embodiment (as Figs. 2 and 3 show), the current monitoring means 40 includes an isolated current sensing transformer 50 connected in the second conducting line 36. In this arrangement, the current sensing transformer 50 directly measures the radiofrequency current passing through the ablation electrode 16 to the indifferent patch electrode 18.
The measured value is a radiofrequency sig nal varying at the selected~rate, which in the il lustrated embodiment is 5ot7 kFiz .
The current sensing transformer 50 is con-nected to the first control output 44, which derives RMS current. The first control output 44 includes an integrated circuit RMS converter 52 to do this Z ~. ~~ ~ ''.~~
;::,:, function. The RMS current converter first squares the radiofrequency current input signal from the current sensing transformer 50, and then averages the squared signal over a user prescribed period (which in the illustrated embodiment is about once every 0. O1 second) . The RMS current converter 52 then takes the square root of the average squared value. The resulting output represents RMS current.
The RMS current signal takes the form of a relatively slowly varying signal, compared with the rapidly varying radiofrequency current input signal.
As Figs. 2 and 3 show, the voltage monitoring means 42 includes an isolated voltage sensing transformer 54 that is connected between the first and second conducting lines. In this arran-gement, the voltage sensing transformer 54 directly measures the radiofrequency voltage across the body tissue between the ablation electrode 16 and the indifferent patch electrode 18.
Like the value measured by the current sensing transformer 50, the measured voltage value is a radiofrequency signal varying at the selected 500 kHz rate:
The voltage sensing transformer 54 is con nected to the second control output 46, which derives RMS voltage. The second control output 46 includes an integrated circuit RMS converter 56 to do this function. The RMS voltage converter 56 squares the,radiofrequency voltage input signal and then averages it over the same user prescribed period used by the current converter 52. The RMS
voltage converter 56 then takes the square root of the average squared voltage value.
The resulting RMS voltage signal (like the RMS current signal) takes the form of a relatively ~. WO 94/10921 ~ ~ ~ ~ '~ '~ ~~. PCT/US93/10902 slowly varying signal.
The voltage sensing transformer 54 is also connected to the third control output 48, which derives actual phase sensitive power. The third control output 48 includes an analog multiplier in-tegrated circuit 58 to do this function. The multi-plier circuit 58 receives as one input the radiofre-quency input current signal directly from the cur-rent sensing transformer 50. The multiplier circuit 58' also receives as a second input the radiofrequency input voltage signal directly fram the voltage sensing transformer 54.
The output of the multiplier circuit 58 is the product of these two inputs, which represents the actual radiofrequency power transmitted by the ablation electrode 16.
The power value is (like its component cur-rent and voltage inputs) a radiofrequency signal varying at a relatively high radiofrequency rate.
The third control output 48 also includes a low pass filter 60. Tn the illustrated em-bodiment, which operates with a radiofrequency rate of 500 kHz, the cut off frequency of the filter 60 selected is about l00 Hz. The rapidly varying measured input power value is low pass filtered by the filter 60 into~a relatively slowly varying sig-nal.
This signal represents the actual phase sensitive powex signal of the radiofrequency energy that the ablation electrode 16 delivers to the tar-geted tissue.
The first, second, and third control out-puts 44, 46, and 48 each includes appropriate inline scaling circuits 62. The scaling circuits 62 scale the RMS current signal, the RMS voltage signal, and the actual phase sensitive power signal to a spec ified voltage range .that can be usable by the remainder of generator 12 circuitry. In the il lustrated embodiment, the scaled range is 0.0 to 5.0 5 volts.
The first monitoring means 38 also includes an analog to digital converter 64. The converter 64 digitizes a selected one or more of the analog RMS
current output signal, RMS voltage output signal, 10 and the actual phase sensitive power signal.
The digital outputs) of the converter 64 can be used to display measurement results. In the illustrated embodiment, the system 10 includes a first digital display 66 an the generator 12 to show the user the actual phase sensitive power signal.
The digital outputs) of the converter 64 also can be used to control operation of the generator 12. In the illustrated embodiment, the system 10 uses the digitized outputs in a feedback loop that maintains radiofrequency output voltage within a desired range or at a constant value to control radiofrequency power at the ablation electrode 16. By controlling the power delivered by the generator 12, the physician can reproducibly form lesions of the desired depth during an ablation procedure.
In this arrangement, the system 10 includes an input 68 for the user to enter an operating value desired for the actual phase sensitive power for the generator 12. The system 10 includes power control means 70 that includes comparator 71 to compare de-sired power with actual phase sensitive power. The output of the comparator varies the output voltage of radiofrequency power source 30 to maintain minimum error between the measured actual power and W094/10921 ') "~ ~ ~'~ ~~. /~. PCT/US93/109~
r~__~:~~ _ the set point power.
In the illustrated embodiment, the power control means 70 also monitors phase differences between radiofrequency voltage and current. The power control means 7o does this function by compu-ting apparent power and by comparing the computed apparent power to the actual phase sensitive power.
If the radiofrequency voltage and current signals are exactly in phase, the apparent power and actual phase sensitive power will be the same. However, if there is a phase difference, actual phase sensitive power will differ from the apparent power by a fac-tor that represents the cosine of the phase angle.
In the illustrated embodiment, the power control means 70 includes a multiplier circuit 72 that obtains the product of the RMS current and RMS
voltage. The resulting output of the multiplier circuit 72 forms the apparent (i.e., not phase sen sitive) power of the system 10. The power control means 70 includes a comparator 74 to compare the derived apparent power with the actual phase sen-sitive power. The magnitude of the output of the comparator 74 quantifies the amount of the phase shift.
If the output of the phase shift comparator 74 exceeds a preselected amount, the power control means ?0 generates a warning signal to show that a phase shift between the radiofrequency voltage and current has occurred: The system l0 may include a flashing light and audible alarm (not shown) to warn the user.
The power control means 70 operates to maintain a constant set power when the output of the phase shift comparator 74 remains within an allowa-ble range above the threshold amount. The power 2 ~. ~ g '~ ~~ ~3 WO 94!10921 PCT/US93/10902 control means 70 operates to reduce the output vol-tage of the source,30,when the output of the phase shift comparator 74 increases beyond this range. If the output of the phase shift comparator 74 shows a phase shift beyond a maximum threshold value, the power control means 70 generates a signal to shut off all power to the ablation electrode 16.
According to the invention, the system 10 also includes means 76 for identifying and monitoring the physical and/or functional character istics of the catheter 14 that is connected to the radiofrequency generator 12.
The resulting control functions of the catheter identification means 76 can vary.
In one preferred arrangement (shown in Fig.
4), the identification means 76 assures that the catheter l4 and its intended use meet predetermined functional and therapeutic criteria.
In this embodiment, the identification means 76 senses the actual functional characteris tics of the catheter 14 connected to the generator 12. The identification means compares these actual characteristics to the characteristics required for the intended use, based upon predetermined criteria.
Based upon this comparison, the identification means 76 generates a variety of output control signals.
The control signals either actively control or passively monitor the operational characteristics of catheter 14 used in association with the power generator 12. The system 10 thereby guards against the use of a catheter 14 that does not meet the performance characteristics required.
More particularly, when the sensed physical and/or functional characteristics of the catheter 14 meet the predetermined use criteria, the output w. WO 94/ 10921 ,~ ~ r~ ~ ~~, PCT/US93/10902 control signal generated by the identification means 76 actively permits the intended use of the catheter 14. Alternatively, the output control. signal generates a passive, user discernible "Use Permitted" message under this condition. Still alternatively, the output control signal can simul-taneously permit use while generating a confirming, user discernible message.' Likewise, when the sensed physical and/or functional characteristics of the catheter 14 do not meet the predetermined use criteria, the output r control signal generated by the identification means 76 actively intervenes to prevent the intended use of the catheter 14. Alternatively, the output control signal generates a passive, user discernible "Use Not Permitted" alarm under this condition.
Still alternatively, the output control signal can simultaneously prevent use while generating a con-firming, user discernible alarm:
In another preferred arrangement (shown in Fig. 5), the identification means 76 generates sig-pals that track the use of the catheter 12. This aspect of the invention guards against the reuse or overuse of a given catheter 14.
The particular details of these arran-gements will now be discussed.
ControllinS~,/Monitorina the Catheter-Generator Interface 3'0 In Fig. 4, the identification means 76 senses the actual physical and/or functional charac-teristics of the attached catheter 14 and compares these to predetermined criteria.
As shown in Fig. 4, the identification means 76 includes means 88 carried within the catheter handle 20 for automatically generating a uniquely coded identification signal 90 when the catheter 14 is attached to the system 10. The sig-na1 90 is coded to uniquely identify the particular performance and/or physical characteristics of the catheter 14 and attached electrode 16.
The selected catheter characteristics identified by the code can vary. They may include electrode surface area, electrode configuration, electrode orientation, and electrode field disper-sion properties: They also indicate the presence of a temperature sensor or thermistor and its associated resistance calibration value. They may simply identify catheter product numbers or other commercial designations.
The catheter identification means 88 car-ried within the handle can vary.
In one embodiment, the catheter iden tification means 88 can comprise a resistor having a prescribed ohm value, which varies according to the physical and/or performance characteristics of the catheter 14. The sensed ohm value then becomes the identification code for the catheter.
In an alternative and preferred embodiment, instead of the resistor, the catheter identification means 88 can comprise a solid state micro-chip, ROM, EEROM, EPROM, or non-volatile RAM carried within the handle 20. The micro-chip can be pre-programmed with a digital value representing the catheter iden tification code and other information. In this way, the catheter itself can be programmed to store information about its operational and functional characteristics.
The identification means 76 includes a register means 92 that latches the sensed catheter .; WO 94/10921 ~ ~. ~L i~ ~ ~ !~ PCT/US93/10902 identification code when the catheter 14 is attached to the generator 12.
M
The identification means 76 also includes a catheter criteria look-up table 86 in system ROM.
5 The table 86 specifies the catheter types that are approved for use in association with the system l0, as well as those catheter types that are not ap-proved for use. The selection criteria takes into account the performance and/or physical characteris-10 tics necessary for safe and efficacious therapeutic use, based upon empirical testing, governmental regulatory approval, and similar relevant con-siderations.
The approved catheter types in the look-up 15 table 86 are coded to correspond with the iden tification codes the catheter 14 carries.
Preferably, the codes in the look up table 86 further classify the, physical and/or performance characteristics of different catheters 14 at dif-ferent set power conditions, as determined by em-pirical testing.
In this arrangement, the table 86 permits the identification means 76 to distinguish between acceptable and unacceptable catheter types on an interactive basis, taking into account the particul ar power condition~set for the generator 12.
When the identification means 76 takes into account the selected power output of the generator 12, one catheter code may be acceptable for use at low selected power outputs, whereas the same catheter code may not be acceptable at selected higher power outputs.
The identification means 76 also includes a comparator 96. The comparator 96 looks to the input 68 to determine the set power condition and .~ ~, ~ r~ -~- ~~ p~'/US93/10902 '' WO 94/10921 , compares the sensed catheter type (latched in the register means 92 ) with the catheter types listed in the catheter criteria table 86.
When the sensed physical and/or functional characteristics of the catheter 14 and the predeter mined criteria at the set power condition match, the comparator 96 generates a first control signal 78.
When the sensed physical and/or functional charact eristics of the catheter 14 and the predetermined criteria at the set power condition do not match, the comparator 96 generates a second control signal 80.
The first control signal 78 enables the physician to operate the system IO with the catheter 14 selected and at the set power condition. In ad-dition, the first control signal 78 preferably generates a confirming, user discernible "Use Per-mitted" message 79.
The second control signal 80 disables or at least discourages operation of the system 10 at the set power condition. The particular operative effect of second control signal 80 can vary.
In a preferred embodiment, the second control signal 80 activates an interlock 82 that disables the power generator 12. The interlock 82 prevents operation of the system 10, thereby preventing the intended use of the catheter 14.
Alternatively, the second control signal 80 generates a user discernible '~Use Not Permitted"
alarm message 84 under this condition. Most preferably, the second control signal 80 simultan eously activates the interlock 82 while generating a confirming, user discernible alarm 84.
The identification means 76 also preferably serves as an information source for the physician.
WO 94/10921 ~, ~. ~ ~j r~ ~~, (~ PCT/US93/10902 In this mode, the identification means 76 includes a look-up table 87 that correlates the catheter identification codes with a user readable message that contains useful physical and performance infor-mation about the selected catheter 14. The message can list the manufacturer of the catheter, the surface area and other relevant characteristics of the ablating electrode, including the presence or absence of temperature sensing elements. The message can also list the set power conditions approved or recommended for the catheter.
In this embodiment, the identification means 76 includes a second comparator 97. The com-parator reads the code latched in the register means 92 looks to the table 87 to obtain the corresponding message. The comparator 97 outputs the message to a display device 99 for the physician, to read.
Monitoring Catheter Use As Fig. 5 shows, the identification means 76 can also serve to monitor the use of the catheter 14 .
In this preferred embodiment, the iden-tification means 76 includes a use register 98 car-tied within the catheter handle 20. The use register 98 latches a digital value representing the number of times the catheter 14 has been used.
Preferably, the use register 98 comprises a solid state micro-chip having non-volatile RAM
carried within the catheter handle 20.
The use register 98 is initially programmed by the manufacturer with a digital value of zero.
The use register 98 includes an output 100 for generating this digital value. The use register 98 also includes an input 102 for incrementing the W0 94/10921 ~ ~ ~ ~ ~- r~ PCT/US93/10902 digital value after each use.
The identification means 76 includes means 104 for incrementing by one the digital value car ried by the use register 98 after each permitted use of the catheter 14.
The identification means 76 also includes means 106 for determining the digital value resident within the use register 98 before allowing use of the catheter 14 with the generator 12.
In this arrangement, the identification means 76 includes a comparator 108 that compares the resident digital value with a set value in a 'use criteria table 110, which represents the maximum number of uses allowed.
If the resident value is less than the set value, the comparator generates a signal 114 that permits continued use of the catheter 14 with the power generator 12.
If the resident value equals or exceeds the set value, the comparator 108 generates a signal 116 to activate the previously described power interlock 82. The interlock 82 prevents use of the catheter l4 with the.generator 12.
Alternatively, the comparator 108 simply activates a display 112 to warn the physician, coun seling against reuse of the chosen catheter 14. Of course, the identification means can both activate the interlock 82 and the display 112.
Various features of the invention are set forth in the following claims.
The generator 12 includes a radiofrequency power source 30 connected through a main isolation transformer 32 to first and second conducting lines 34 and 36.
In the illustrated environment, the power source 30 delivers up to 50 watts of power at a fre quency of 500 kHz. The first conducting line 34 leads to the ablation electrode 16.. The second con ducting line 36 leads to the indifferent patch electrode 18.
As Figs. 2 and 3 show, the system l0 includes first monitoring means 38 for measuring the radiofrequency current and radiofrequency voltage delivered by the generator i2 to the patient. The first monitoring means 38 also derives control sig-. nals indicative of RMS (root mean squared) voltage (in volts), RMS current (in amps), and actual phase sensitive power (in watts) to support other control functions of the generator 12.
The first monitoring means 38 may be variously configured and constructed. In the iI
lustrated embodiment, the first monitoring means 38 includes currant monitoring means 40 for measuring the radiofrequency current passing from the first line 34 through the tissue to the second line 36 (i.e., from the ablation electrode 16 to the indif-~C ~ r,7 WO 94/10921 ~ '~ r '~ ~ ~~ ~' PCT/US93/10902 ferent patch electrode 18).
The first monitoring means 38 also includes voltage monitoring means 42. The voltage monitoring means 42 measures the radiofrequency voltage generated between the first and second conducting lines 34 and 36 (i.e., between the ablation electrode 16 and the indifferent patch electrode 18) .
The first monitoring means 38 includes three control outputs 44, 46, and 48.
The first control output 44 carries a sig-nal representative of RMS current conducted by the ablation electrode 16.
The second control output 46 carries a sig nal representative of the RMS voltage between the ablation electrode 16 and the indifferent patch electrode 18.
The third control output 48 carries a sig nal representative of actual phase sensitive power transmitted by the ablation electrode 16.
In the illustrated embodiment (as Figs. 2 and 3 show), the current monitoring means 40 includes an isolated current sensing transformer 50 connected in the second conducting line 36. In this arrangement, the current sensing transformer 50 directly measures the radiofrequency current passing through the ablation electrode 16 to the indifferent patch electrode 18.
The measured value is a radiofrequency sig nal varying at the selected~rate, which in the il lustrated embodiment is 5ot7 kFiz .
The current sensing transformer 50 is con-nected to the first control output 44, which derives RMS current. The first control output 44 includes an integrated circuit RMS converter 52 to do this Z ~. ~~ ~ ''.~~
;::,:, function. The RMS current converter first squares the radiofrequency current input signal from the current sensing transformer 50, and then averages the squared signal over a user prescribed period (which in the illustrated embodiment is about once every 0. O1 second) . The RMS current converter 52 then takes the square root of the average squared value. The resulting output represents RMS current.
The RMS current signal takes the form of a relatively slowly varying signal, compared with the rapidly varying radiofrequency current input signal.
As Figs. 2 and 3 show, the voltage monitoring means 42 includes an isolated voltage sensing transformer 54 that is connected between the first and second conducting lines. In this arran-gement, the voltage sensing transformer 54 directly measures the radiofrequency voltage across the body tissue between the ablation electrode 16 and the indifferent patch electrode 18.
Like the value measured by the current sensing transformer 50, the measured voltage value is a radiofrequency signal varying at the selected 500 kHz rate:
The voltage sensing transformer 54 is con nected to the second control output 46, which derives RMS voltage. The second control output 46 includes an integrated circuit RMS converter 56 to do this function. The RMS voltage converter 56 squares the,radiofrequency voltage input signal and then averages it over the same user prescribed period used by the current converter 52. The RMS
voltage converter 56 then takes the square root of the average squared voltage value.
The resulting RMS voltage signal (like the RMS current signal) takes the form of a relatively ~. WO 94/10921 ~ ~ ~ ~ '~ '~ ~~. PCT/US93/10902 slowly varying signal.
The voltage sensing transformer 54 is also connected to the third control output 48, which derives actual phase sensitive power. The third control output 48 includes an analog multiplier in-tegrated circuit 58 to do this function. The multi-plier circuit 58 receives as one input the radiofre-quency input current signal directly from the cur-rent sensing transformer 50. The multiplier circuit 58' also receives as a second input the radiofrequency input voltage signal directly fram the voltage sensing transformer 54.
The output of the multiplier circuit 58 is the product of these two inputs, which represents the actual radiofrequency power transmitted by the ablation electrode 16.
The power value is (like its component cur-rent and voltage inputs) a radiofrequency signal varying at a relatively high radiofrequency rate.
The third control output 48 also includes a low pass filter 60. Tn the illustrated em-bodiment, which operates with a radiofrequency rate of 500 kHz, the cut off frequency of the filter 60 selected is about l00 Hz. The rapidly varying measured input power value is low pass filtered by the filter 60 into~a relatively slowly varying sig-nal.
This signal represents the actual phase sensitive powex signal of the radiofrequency energy that the ablation electrode 16 delivers to the tar-geted tissue.
The first, second, and third control out-puts 44, 46, and 48 each includes appropriate inline scaling circuits 62. The scaling circuits 62 scale the RMS current signal, the RMS voltage signal, and the actual phase sensitive power signal to a spec ified voltage range .that can be usable by the remainder of generator 12 circuitry. In the il lustrated embodiment, the scaled range is 0.0 to 5.0 5 volts.
The first monitoring means 38 also includes an analog to digital converter 64. The converter 64 digitizes a selected one or more of the analog RMS
current output signal, RMS voltage output signal, 10 and the actual phase sensitive power signal.
The digital outputs) of the converter 64 can be used to display measurement results. In the illustrated embodiment, the system 10 includes a first digital display 66 an the generator 12 to show the user the actual phase sensitive power signal.
The digital outputs) of the converter 64 also can be used to control operation of the generator 12. In the illustrated embodiment, the system 10 uses the digitized outputs in a feedback loop that maintains radiofrequency output voltage within a desired range or at a constant value to control radiofrequency power at the ablation electrode 16. By controlling the power delivered by the generator 12, the physician can reproducibly form lesions of the desired depth during an ablation procedure.
In this arrangement, the system 10 includes an input 68 for the user to enter an operating value desired for the actual phase sensitive power for the generator 12. The system 10 includes power control means 70 that includes comparator 71 to compare de-sired power with actual phase sensitive power. The output of the comparator varies the output voltage of radiofrequency power source 30 to maintain minimum error between the measured actual power and W094/10921 ') "~ ~ ~'~ ~~. /~. PCT/US93/109~
r~__~:~~ _ the set point power.
In the illustrated embodiment, the power control means 70 also monitors phase differences between radiofrequency voltage and current. The power control means 7o does this function by compu-ting apparent power and by comparing the computed apparent power to the actual phase sensitive power.
If the radiofrequency voltage and current signals are exactly in phase, the apparent power and actual phase sensitive power will be the same. However, if there is a phase difference, actual phase sensitive power will differ from the apparent power by a fac-tor that represents the cosine of the phase angle.
In the illustrated embodiment, the power control means 70 includes a multiplier circuit 72 that obtains the product of the RMS current and RMS
voltage. The resulting output of the multiplier circuit 72 forms the apparent (i.e., not phase sen sitive) power of the system 10. The power control means 70 includes a comparator 74 to compare the derived apparent power with the actual phase sen-sitive power. The magnitude of the output of the comparator 74 quantifies the amount of the phase shift.
If the output of the phase shift comparator 74 exceeds a preselected amount, the power control means ?0 generates a warning signal to show that a phase shift between the radiofrequency voltage and current has occurred: The system l0 may include a flashing light and audible alarm (not shown) to warn the user.
The power control means 70 operates to maintain a constant set power when the output of the phase shift comparator 74 remains within an allowa-ble range above the threshold amount. The power 2 ~. ~ g '~ ~~ ~3 WO 94!10921 PCT/US93/10902 control means 70 operates to reduce the output vol-tage of the source,30,when the output of the phase shift comparator 74 increases beyond this range. If the output of the phase shift comparator 74 shows a phase shift beyond a maximum threshold value, the power control means 70 generates a signal to shut off all power to the ablation electrode 16.
According to the invention, the system 10 also includes means 76 for identifying and monitoring the physical and/or functional character istics of the catheter 14 that is connected to the radiofrequency generator 12.
The resulting control functions of the catheter identification means 76 can vary.
In one preferred arrangement (shown in Fig.
4), the identification means 76 assures that the catheter l4 and its intended use meet predetermined functional and therapeutic criteria.
In this embodiment, the identification means 76 senses the actual functional characteris tics of the catheter 14 connected to the generator 12. The identification means compares these actual characteristics to the characteristics required for the intended use, based upon predetermined criteria.
Based upon this comparison, the identification means 76 generates a variety of output control signals.
The control signals either actively control or passively monitor the operational characteristics of catheter 14 used in association with the power generator 12. The system 10 thereby guards against the use of a catheter 14 that does not meet the performance characteristics required.
More particularly, when the sensed physical and/or functional characteristics of the catheter 14 meet the predetermined use criteria, the output w. WO 94/ 10921 ,~ ~ r~ ~ ~~, PCT/US93/10902 control signal generated by the identification means 76 actively permits the intended use of the catheter 14. Alternatively, the output control. signal generates a passive, user discernible "Use Permitted" message under this condition. Still alternatively, the output control signal can simul-taneously permit use while generating a confirming, user discernible message.' Likewise, when the sensed physical and/or functional characteristics of the catheter 14 do not meet the predetermined use criteria, the output r control signal generated by the identification means 76 actively intervenes to prevent the intended use of the catheter 14. Alternatively, the output control signal generates a passive, user discernible "Use Not Permitted" alarm under this condition.
Still alternatively, the output control signal can simultaneously prevent use while generating a con-firming, user discernible alarm:
In another preferred arrangement (shown in Fig. 5), the identification means 76 generates sig-pals that track the use of the catheter 12. This aspect of the invention guards against the reuse or overuse of a given catheter 14.
The particular details of these arran-gements will now be discussed.
ControllinS~,/Monitorina the Catheter-Generator Interface 3'0 In Fig. 4, the identification means 76 senses the actual physical and/or functional charac-teristics of the attached catheter 14 and compares these to predetermined criteria.
As shown in Fig. 4, the identification means 76 includes means 88 carried within the catheter handle 20 for automatically generating a uniquely coded identification signal 90 when the catheter 14 is attached to the system 10. The sig-na1 90 is coded to uniquely identify the particular performance and/or physical characteristics of the catheter 14 and attached electrode 16.
The selected catheter characteristics identified by the code can vary. They may include electrode surface area, electrode configuration, electrode orientation, and electrode field disper-sion properties: They also indicate the presence of a temperature sensor or thermistor and its associated resistance calibration value. They may simply identify catheter product numbers or other commercial designations.
The catheter identification means 88 car-ried within the handle can vary.
In one embodiment, the catheter iden tification means 88 can comprise a resistor having a prescribed ohm value, which varies according to the physical and/or performance characteristics of the catheter 14. The sensed ohm value then becomes the identification code for the catheter.
In an alternative and preferred embodiment, instead of the resistor, the catheter identification means 88 can comprise a solid state micro-chip, ROM, EEROM, EPROM, or non-volatile RAM carried within the handle 20. The micro-chip can be pre-programmed with a digital value representing the catheter iden tification code and other information. In this way, the catheter itself can be programmed to store information about its operational and functional characteristics.
The identification means 76 includes a register means 92 that latches the sensed catheter .; WO 94/10921 ~ ~. ~L i~ ~ ~ !~ PCT/US93/10902 identification code when the catheter 14 is attached to the generator 12.
M
The identification means 76 also includes a catheter criteria look-up table 86 in system ROM.
5 The table 86 specifies the catheter types that are approved for use in association with the system l0, as well as those catheter types that are not ap-proved for use. The selection criteria takes into account the performance and/or physical characteris-10 tics necessary for safe and efficacious therapeutic use, based upon empirical testing, governmental regulatory approval, and similar relevant con-siderations.
The approved catheter types in the look-up 15 table 86 are coded to correspond with the iden tification codes the catheter 14 carries.
Preferably, the codes in the look up table 86 further classify the, physical and/or performance characteristics of different catheters 14 at dif-ferent set power conditions, as determined by em-pirical testing.
In this arrangement, the table 86 permits the identification means 76 to distinguish between acceptable and unacceptable catheter types on an interactive basis, taking into account the particul ar power condition~set for the generator 12.
When the identification means 76 takes into account the selected power output of the generator 12, one catheter code may be acceptable for use at low selected power outputs, whereas the same catheter code may not be acceptable at selected higher power outputs.
The identification means 76 also includes a comparator 96. The comparator 96 looks to the input 68 to determine the set power condition and .~ ~, ~ r~ -~- ~~ p~'/US93/10902 '' WO 94/10921 , compares the sensed catheter type (latched in the register means 92 ) with the catheter types listed in the catheter criteria table 86.
When the sensed physical and/or functional characteristics of the catheter 14 and the predeter mined criteria at the set power condition match, the comparator 96 generates a first control signal 78.
When the sensed physical and/or functional charact eristics of the catheter 14 and the predetermined criteria at the set power condition do not match, the comparator 96 generates a second control signal 80.
The first control signal 78 enables the physician to operate the system IO with the catheter 14 selected and at the set power condition. In ad-dition, the first control signal 78 preferably generates a confirming, user discernible "Use Per-mitted" message 79.
The second control signal 80 disables or at least discourages operation of the system 10 at the set power condition. The particular operative effect of second control signal 80 can vary.
In a preferred embodiment, the second control signal 80 activates an interlock 82 that disables the power generator 12. The interlock 82 prevents operation of the system 10, thereby preventing the intended use of the catheter 14.
Alternatively, the second control signal 80 generates a user discernible '~Use Not Permitted"
alarm message 84 under this condition. Most preferably, the second control signal 80 simultan eously activates the interlock 82 while generating a confirming, user discernible alarm 84.
The identification means 76 also preferably serves as an information source for the physician.
WO 94/10921 ~, ~. ~ ~j r~ ~~, (~ PCT/US93/10902 In this mode, the identification means 76 includes a look-up table 87 that correlates the catheter identification codes with a user readable message that contains useful physical and performance infor-mation about the selected catheter 14. The message can list the manufacturer of the catheter, the surface area and other relevant characteristics of the ablating electrode, including the presence or absence of temperature sensing elements. The message can also list the set power conditions approved or recommended for the catheter.
In this embodiment, the identification means 76 includes a second comparator 97. The com-parator reads the code latched in the register means 92 looks to the table 87 to obtain the corresponding message. The comparator 97 outputs the message to a display device 99 for the physician, to read.
Monitoring Catheter Use As Fig. 5 shows, the identification means 76 can also serve to monitor the use of the catheter 14 .
In this preferred embodiment, the iden-tification means 76 includes a use register 98 car-tied within the catheter handle 20. The use register 98 latches a digital value representing the number of times the catheter 14 has been used.
Preferably, the use register 98 comprises a solid state micro-chip having non-volatile RAM
carried within the catheter handle 20.
The use register 98 is initially programmed by the manufacturer with a digital value of zero.
The use register 98 includes an output 100 for generating this digital value. The use register 98 also includes an input 102 for incrementing the W0 94/10921 ~ ~ ~ ~ ~- r~ PCT/US93/10902 digital value after each use.
The identification means 76 includes means 104 for incrementing by one the digital value car ried by the use register 98 after each permitted use of the catheter 14.
The identification means 76 also includes means 106 for determining the digital value resident within the use register 98 before allowing use of the catheter 14 with the generator 12.
In this arrangement, the identification means 76 includes a comparator 108 that compares the resident digital value with a set value in a 'use criteria table 110, which represents the maximum number of uses allowed.
If the resident value is less than the set value, the comparator generates a signal 114 that permits continued use of the catheter 14 with the power generator 12.
If the resident value equals or exceeds the set value, the comparator 108 generates a signal 116 to activate the previously described power interlock 82. The interlock 82 prevents use of the catheter l4 with the.generator 12.
Alternatively, the comparator 108 simply activates a display 112 to warn the physician, coun seling against reuse of the chosen catheter 14. Of course, the identification means can both activate the interlock 82 and the display 112.
Various features of the invention are set forth in the following claims.
Claims (25)
1. A catheter system, comprising a catheter having one or more tissue ablation electrodes, and a stored electronic identification code that identifies one or more operating characteristics of the catheter; and a generator connectable to the catheter, wherein the generator is configured to sense the identification code when the catheter is connected thereto.
2. The catheter system of claim 1, wherein the generator is further configured to supply power to the one or more electrodes based on the sensed identification code.
3. The catheter system of claim 1, wherein the generator includes stored criteria for governing interaction between the generator and the catheter.
4. The catheter system of claim 3, wherein the generator generates a first control signal if the one or more operating characteristics associated with the sensed identification code meets the stored criteria, and a second control signal if the one or more operating characteristics associated with the sensed identification code does not meet the stored criteria.
5. The catheter system of claim 4, wherein the generator operates the one or more electrodes in a first power mode in response to the first control signal and in a second power mode in response to the second control signal.
6. The catheter system of claim 4, wherein the generator permits power to flow to the one or more electrodes in response to the first control signal, and prevents power from flowing to the one or more electrodes in response to the second control signal.
7. The catheter system of claim 4, wherein the generator generates a first user discernible signal in response to the first control signal, and a second user discernible signal in response to the second control signal.
8. The catheter system of claim 3, wherein the stored criteria comprise operational characteristics necessary for safe and efficacious therapeutic use.
9. The catheter system of claim 3, wherein the stored criteria comprise operational characteristics necessary for safe and efficacious therapeutic use under preset conditions.
10. The catheter system of claim 9, wherein the preset conditions comprises power levels.
11. The catheter system of claim 1, wherein the generator is further configured to generate a user discernible signal indicative of the operating characteristic associated with the identification code.
12. A catheter device, comprising:
a guide body;
one or more tissue ablation electrodes mounted on the guide body; a memory device associated with the guide body; and an electronic identification code stored in the memory device, the identification code identifying one or more operating characteristics of the catheter device.
a guide body;
one or more tissue ablation electrodes mounted on the guide body; a memory device associated with the guide body; and an electronic identification code stored in the memory device, the identification code identifying one or more operating characteristics of the catheter device.
13. The catheter device of claim 12, wherein the one or more operating characteristics associated with the identification code includes a physical characteristic of the catheter device.
14. The catheter device of claim 12, wherein the one or more operating characteristics associated with the identification code includes a performance characteristic of the catheter device.
15. The catheter device of claim 12, wherein the memory device comprises programmable memory.
16. The catheter device of claim 12, wherein the memory device is a non-solid state device.
17. The catheter device of claim 12, wherein the memory device comprises a resistor.
18. A catheter system, comprising a catheter having one or more tissue ablation electrodes, and a stored electronic usage value representing the number of times the one or more electrodes has been used; and a generator connectable to the catheter, wherein the generator is configured to sense the stored usage value when the catheter is connected thereto.
19. The catheter system of claim 18, wherein the generator is further configured to supply power to the one or more electrodes based on the sensed usage value.
20. The catheter system of claim 18, wherein the generator includes a stored predetermined value representing the maximum number of times the one or more electrodes can be used.
21. The catheter system of claim 20, wherein the generator generates different first and second control signals based on a comparison between the sensed usage value and the predetermined value.
22. The catheter system of claim 21, wherein the first control signal is generated if the sensed usage value is less than the predetermined value, and the second control signal is generated when the sensed usage code is equal to or greater than the predetermined value.
23. The catheter system of claim 21, wherein the generator permits power to flow to the one or more electrodes in response to the first control signal, and prevents power from flowing to the one or more electrodes in response to the second control signal.
24. The catheter system of claim 21, wherein the generator generates a first user discernible signal in response to the first control signal, and a second user discernible signal in response to the second control signal.
25. A catheter device, comprising:
a guide body;
one or more tissue ablation electrodes mounted on the guide body; a memory device associated with the guide body; and an electronic usage value stored in the memory device, the usage value representing the number of times the one or more electrodes has been used.
a guide body;
one or more tissue ablation electrodes mounted on the guide body; a memory device associated with the guide body; and an electronic usage value stored in the memory device, the usage value representing the number of times the one or more electrodes has been used.
Applications Claiming Priority (3)
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US07/976,691 | 1992-11-13 | ||
US07/976,691 US5383874A (en) | 1991-11-08 | 1992-11-13 | Systems for identifying catheters and monitoring their use |
PCT/US1993/010902 WO1994010921A1 (en) | 1992-11-13 | 1993-11-12 | Systems for identifying catheters and monitoring their use |
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Publication Number | Publication Date |
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CA2148714A1 CA2148714A1 (en) | 1994-05-26 |
CA2148714C true CA2148714C (en) | 2006-12-05 |
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Application Number | Title | Priority Date | Filing Date |
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CA002148714A Expired - Fee Related CA2148714C (en) | 1992-11-13 | 1993-11-12 | Systems for identifying catheters and monitoring their use |
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US (2) | US5383874A (en) |
EP (1) | EP0746249A1 (en) |
JP (1) | JPH08506738A (en) |
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-
1992
- 1992-11-13 US US07/976,691 patent/US5383874A/en not_active Expired - Lifetime
-
1993
- 1993-11-12 WO PCT/US1993/010902 patent/WO1994010921A1/en not_active Application Discontinuation
- 1993-11-12 EP EP94901261A patent/EP0746249A1/en not_active Withdrawn
- 1993-11-12 JP JP6512347A patent/JPH08506738A/en active Pending
- 1993-11-12 CA CA002148714A patent/CA2148714C/en not_active Expired - Fee Related
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1994
- 1994-12-22 US US08/363,273 patent/US5651780A/en not_active Expired - Lifetime
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EP0746249A4 (en) | 1996-10-07 |
US5383874A (en) | 1995-01-24 |
EP0746249A1 (en) | 1996-12-11 |
CA2148714A1 (en) | 1994-05-26 |
JPH08506738A (en) | 1996-07-23 |
US5651780A (en) | 1997-07-29 |
WO1994010921A1 (en) | 1994-05-26 |
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