US5344431A
Expired / Lapsed
US
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Method and apparatus for determination of end-of-service for implantable devices
Assignee: LATHAM DANIEL W
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Filing: 1992-09-14
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Granted: 1994-09-06
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Expires: 2012-09-14
Abstract
Abstract A method and apparatus for determination of battery end-of-service in a medical device in which the medical device comprises a cathode limited electrochemical cell having an active metal anode and a manganese dioxide cathode and means for digital telemetry of cell voltage. The sloped, well defined voltage curve of such a cell during cell discharge combined with precise information available through digital telemetry allows for improved determination of battery end-of-service for the medical device.
Inventors
- 👤 Donald R. Merritt
- 👤 William G. Howard
- 👤 Paul M. Skarstad
- 👤 Douglas J. Weiss
- 👤 Paul B. Wyborny
- 👤 Glenn M. Roline
- 👤 Lucy M. Nichols
- 👤 David L. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:12
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/372; A61N1/37211; A61N1/37252; A61N1/3727; A61N1/362; A61N1/37; A61N1/3706; A61N1/3708; A61N1/378; Y; Y10; Y10S; Y10S128/00; Y10S128/903
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
84 words
A medical device having battery end-of-service indication comprising: (a) an implantable housing; (b) a medical device within said implantable housing, (c) a cathode-limited electrochemical cell having an active metal anode and a manganese dioxide cathode within the housing; (d) analog voltage measurement means within the housing for measuring a voltage of the electrochemical cell; (e) analog-to-digital conversion means within the housing for converting the measured analog voltage into a digital signal; and (f) telemetry means within the housing for telemetry of the digital signal.
Claim 2
Dependent Claim
84 words
A medical device having battery end-of-service indication comprising: (a) an implantable housing; (b) a medical device within said implantable housing, (c) a cathode-limited electrochemical cell having an active metal anode and a manganese dioxide cathode within the housing; (d) analog voltage measurement means within the housing for measuring a voltage of the electrochemical cell; (e) analog-to-digital conversion means within the housing for converting the measured analog voltage into a digital signal; and (f) telemetry means within the housing for telemetry of the digital signal.
Claim 3
Dependent Claim
14 words
A medical device according to claim 1 wherein the active metal anode is lithium.
Claim 4
Dependent Claim
33 words
A medical device according to claim 2 wherein a capacity ratio of lithium anode to manganese dioxide in the cathode limited electrochemical cell is in a range of about 1.0 to about 1.5.
Claim 5
Dependent Claim
19 words
A medical device according to claim 1 wherein telemetry of the digital signal is accomplished by pulse position modulation.
Claim 6
Dependent Claim
25 words
A medical device according to claim 1 wherein telemetry of the digital signal includes means for multiple voltage data transmission and means for error detection.
Claim 7
Independent Claim
67 words
A method for determining battery end-of-service for implantable medical device comprising: (a) providing a cathode limited electrochemical cell having an active metal anode and a manganese dioxide cathode in an implantable medical device; (b) measuring a voltage of the cathode limited electrochemical cell in analog form; (c) converting the analog voltage measurement into a digital signal; and (d) transmitting the digital signal from the implantable medical device.
Claim 8
Independent Claim
67 words
A method for determining battery end-of-service for implantable medical device comprising: (a) providing a cathode limited electrochemical cell having an active metal anode and a manganese dioxide cathode in an implantable medical device; (b) measuring a voltage of the cathode limited electrochemical cell in analog form; (c) converting the analog voltage measurement into a digital signal; and (d) transmitting the digital signal from the implantable medical device.
Claim 9
Dependent Claim
22 words
A method according to claim 6 wherein the step of providing an electrochemical cell includes the step of providing a lithium anode.
Claim 10
Dependent Claim
50 words
A method according to claim 7 wherein the step of providing an electrochemical cell includes the step of providing lithium anode and manganese dioxide cathode in the electrochemical cell in a capacity ratio of lithium to manganese dioxide in the cell in a range of about 1.0 to about 1.5.
Claim 11
Dependent Claim
21 words
A method according to claim 6 wherein the step of transmitting of the digital signal is accomplished by pulse position modulation.
Claim 12
Dependent Claim
31 words
A method according to claim 6 wherein the step of transmitting the digital signal includes transmitting the digital signal at least twice with error detection comparison of the transmitted digital signals.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-05 | 1998-03-07 | 1998-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-05 | 2002-03-07 | 2002-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-05 | 2006-03-07 | 2006-09-06 | $7700.00 | Window Closed / Lapsed |