US3841336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pacer battery failure detection circuit
Assignee: American Optical Corp
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Filing: 1973-12-14
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Granted: 1974-10-15
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Expires: 1993-12-14
Abstract
Abstract There is disclosed a conventional-type demand pacer to which there is added a voltage-controlled oscillator whose frequency is dependent upon the magnitude of the pacer battery voltage. The oscillator is turned on, under external control, when the pacer is switched to the continuous mode. The oscillator then causes pacer pulses to be generated in groups, with a short time interval separating groups. The number of pulses in each group is equal to the number of batteries which are still in service. By counting the number of pulses in each group, for example, by using a de-tuned radio, the number of good batteries remaining in the pacer can be determined.
Inventors
- 👤 R Daynard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:45
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/37; A61N1/3706; A61N1/3708; Y; Y10; Y10S; Y10S320/00; Y10S320/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
An implantable heart pacer comprising a plurality of serially connected batteries, electrode means for connection to a patient''s heart, pulser means for generating and applying stimulating pulses to said electrode means, first timing means for operating continuously and repetitively and for controlling the generation of stimulating pulses at predetermined time intervals after the resetting thereof, said batteries serving to power said pulser means and said first timing means, second timing means for operating in repetitive cycles and including means for resetting said first timing means following each of said repetitive cycles, said second timing means being powered by said batteries when enabled and including means for shortening its cycle of operation in proportion to the series potential of said batteries, and means responsive to external actuation for enabling said second timing means.
Claim 2
Dependent Claim
132 words
An implantable heart pacer comprising a plurality of serially connected batteries, electrode means for connection to a patient''s heart, pulser means for generating and applying stimulating pulses to said electrode means, first timing means for operating continuously and repetitively and for controlling the generation of stimulating pulses at predetermined time intervals after the resetting thereof, said batteries serving to power said pulser means and said first timing means, second timing means for operating in repetitive cycles and including means for resetting said first timing means following each of said repetitive cycles, said second timing means being powered by said batteries when enabled and including means for shortening its cycle of operation in proportion to the series potential of said batteries, and means responsive to external actuation for enabling said second timing means.
Claim 3
Dependent Claim
59 words
An emplantable heart pacer in accordance with claim 1 wherein the cycle of operation of said second timing means has a duration of more than N, but less than N+1, times the duration of the cycle of operation of said first timing means, where N is the number of serially connected batteries when all of said batteries are operating.
Claim 4
Dependent Claim
90 words
An implantable heart pacer in accordance with claim 2 wherein the duration of the cycle of operation of said second timing means is reduced as successive ones of said batteries fail such that the duration of the cycle of operation of said second timing means is at all times greater than N'', but less than N''+1, times the duration of the cycle of operation of said first timing means, where N'' is equal to the number of good batteries remaining in the pacer, as long as the pacer remains operative.
Claim 5
Dependent Claim
90 words
An implantable heart pacer in accordance with claim 1 wherein the duration of the cycle of operation of said second timing means is reduced as successive ones of said batteries fail such that the duration of the cycle of operation of said second timing means is at all times greater than N'', but less than N''+1, times the duration of the cycle of operation of said first timing means, where N'' is equal to the number of good batteries remaining in the pacer, as long as the pacer remains operative.
Claim 6
Dependent Claim
45 words
An implantable heart pacer in accordance with claim 4 further including means for normally operating the pacer in a demand mode, and Means responsive to said external actuation for converting the pacer to operate in a continuous mode while also enabling said second timing means.
Claim 7
Dependent Claim
30 words
An implantable heart pacer in accordance with claim 5 wherein the period of operation of said first timing means decreases as the total voltage of said serially connected batteries decreases.
Claim 8
Dependent Claim
45 words
An implantable heart pacer in accordance with claim 1 further including means for normally operating the pacer in a demand mode, and means responsive to said external actuation for conventing the pacer to operate in a continuous mode while also enabling said second timing means.
Claim 9
Dependent Claim
30 words
An implantable heart pacer in accordance with claim 7 wherein the periof of operation of said first timing means decreases as the total voltage of said serially connected batgeries decreases.
References Cited (Backward Citations)
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |