US4313079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery depletion monitor
Assignee: Medtronic Inc
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Filing: 1980-01-16
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Granted: 1982-01-26
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Expires: 2000-01-16
Abstract
Abstract A CMOS inverter is used to compare pacemaker battery voltage to a referenced voltage. When the reference voltage exceeds the measured battery voltage, the inverter changes state to indicate battery depletion.
Inventors
- 👤 Yan S. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:29
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/04; A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/37; A61N1/3706; A61N1/3708; G01R19/00; G01R19/165; G01R19/16533; G01R19/16538; G01R19/16542; Y; Y10; Y10S; Y10S320/00; Y10S320/18; Y10S320/21
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
A battery voltage monitor for sensing and indicating battery depletion in a pacemaker comprising at least one CMOS inverter having drain, source, input gate and output connections; said source connection connected to ground potential; said drain connection connected to a reference voltage; said reference voltage source producing a reference voltage lower than the undepleted battery voltage; a voltage divider connected to said battery for providing a measured voltage indicative of battery depletion to said input gate, such that said measured voltage level exceeds said reference voltage level in the undepleted battery condition; and wherein the voltage at said output connection changes from a low state to a high state to indicate the attainment of a preset depletion level when said measured voltage reaches a level substantially equal to one-half of said reference voltage.
Claim 2
Dependent Claim
133 words
A battery voltage monitor for sensing and indicating battery depletion in a pacemaker comprising at least one CMOS inverter having drain, source, input gate and output connections; said source connection connected to ground potential; said drain connection connected to a reference voltage; said reference voltage source producing a reference voltage lower than the undepleted battery voltage; a voltage divider connected to said battery for providing a measured voltage indicative of battery depletion to said input gate, such that said measured voltage level exceeds said reference voltage level in the undepleted battery condition; and wherein the voltage at said output connection changes from a low state to a high state to indicate the attainment of a preset depletion level when said measured voltage reaches a level substantially equal to one-half of said reference voltage.
Claim 3
Dependent Claim
118 words
A battery voltage monitor for sensing and indicating battery depletion in a pacemaker comprising: a plurality of CMOS inverters having drain and source connections connected in parallel, respectively, a plurality of independent input gates and output connections; said source connections connected to ground potential; a reference voltage source producing a reference voltage level below the undepleted battery voltage level, connection to drain connections; a voltage network having a plurality of taps respectively connected to said input gates for delivery to said gates measured voltages indicative of the level of battery depletion; and a plurality of output connections whose output state changes to indicate when the respective input gate voltages are substantially equal to one-half of said reference voltage.
Claim 4
Dependent Claim
118 words
A battery voltage monitor for sensing and indicating battery depletion in a pacemaker comprising: a plurality of CMOS inverters having drain and source connections connected in parallel, respectively, a plurality of independent input gates and output connections; said source connections connected to ground potential; a reference voltage source producing a reference voltage level below the undepleted battery voltage level, connection to drain connections; a voltage network having a plurality of taps respectively connected to said input gates for delivery to said gates measured voltages indicative of the level of battery depletion; and a plurality of output connections whose output state changes to indicate when the respective input gate voltages are substantially equal to one-half of said reference voltage.
Claim 5
Dependent Claim
18 words
The monitor of claim 2 further including strobe means for periodically connecting said source connections to ground potential.
References Cited (Backward Citations)
US4217535A
Cited
US4119904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |