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Patent US4231027A successfully refreshed from Google Patents.
US4231027A
Expired / Lapsed
US
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Battery monitoring means for an implantable living tissue stimulator
Assignee: Pacesetter AB
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Filing: 1979-02-28
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Granted: 1980-10-28
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Expires: 1999-02-28
Abstract
Abstract A battery monitoring means for an implantable living tissue stimulator system in which various battery voltages are telemetered to an external receiving means, these voltages being related to the internal impedance of the implanted battery. More specifically, a battery loading circuit is provided which incorporates a switch means for loading the battery in accordance with a predetermined sequence. In a specific embodiment, first and second resistors are sequentially connected across the battery. The battery output voltage is telemetered to an external receiving means during this sequential connection. By knowing the values of the two resistors, the internal impedance of the battery can be calculated, this impedance being related to the remaining life of the implanted battery.
Inventors
- 👤 Brian M. Mann
- 👤 Russell R. Beane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:07
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/372; A61N1/378; A61N1/362; A61N1/37; A61N1/3706; A61N1/3708; A61N1/37211; A61N1/37252
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
In an implantable living tissue stimulator powered by a battery and having a telemetry means for transmitting and receiving signals related to the operation of said tissue stimulator, a battery monitoring means comprising: means for providing said battery output voltage to said telemetry means; load means for altering current through said battery; and means for connecting said load means to said battery thereby altering said battery output voltage by an amount related to the internal impedance of said battery.
Claim 2
Dependent Claim
79 words
In an implantable living tissue stimulator powered by a battery and having a telemetry means for transmitting and receiving signals related to the operation of said tissue stimulator, a battery monitoring means comprising: means for providing said battery output voltage to said telemetry means; load means for altering current through said battery; and means for connecting said load means to said battery thereby altering said battery output voltage by an amount related to the internal impedance of said battery.
Claim 3
Dependent Claim
37 words
The battery monitoring means of claim 1 wherein said load means comprises at least one resistor and said means for connecting comprises switch means for connecting said at least one resistor across output terminals of said battery.
Claim 4
Dependent Claim
40 words
The battery monitoring means of claim 2 in which said at least one resistor comprises a plurality of resistors and said switch means comprises means for sequentially connecting each of said plurality of resistors across output terminals of said battery.
Claim 5
Dependent Claim
31 words
The battery monitoring means of claim 3 wherein said battery is a lithium-iodine battery and said plurality of resistors comprises a 15,000 ohm first resistor and a 60,000 ohm second resistor.
Claim 6
Dependent Claim
80 words
In an implantable living tissue stimulator powered by a battery and having a telemetry means for transmitting and receiving signals related to the operation of said tissue stimulator, a method for determining the internal impedance of said battery comprising the steps of: providing the battery output voltage to said telemetry means; connecting a load means across said battery; and measuring battery voltage changes resulting from said connecting step, said voltage changes being related to the internal impedance of said battery.
Claim 7
Dependent Claim
80 words
In an implantable living tissue stimulator powered by a battery and having a telemetry means for transmitting and receiving signals related to the operation of said tissue stimulator, a method for determining the internal impedance of said battery comprising the steps of: providing the battery output voltage to said telemetry means; connecting a load means across said battery; and measuring battery voltage changes resulting from said connecting step, said voltage changes being related to the internal impedance of said battery.
Claim 8
Dependent Claim
35 words
The method of claim 5 wherein said load means comprises a plurality of resistors and said connecting step further comprises the steps of sequentially connecting each of said plurality of load resistors across said battery.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |