US3593718A
Expired / Lapsed
US
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Physiologically controlled cardiac pacer
Assignee: BIOCYBERNETICS Inc
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Filing: 1967-07-13
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Granted: 1971-07-20
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Expires: 1987-07-13
Abstract
Abstract A cardiac pacer is described which uses a physiological function such as breathing rate, to vary the production of electronic pulses which are fed to a constant current source connected to the ventricle. A constant source compensates for the fibrotic growths that often occur around the electrodes implanted in the heart. In another variation, the pulses are fed to two separate constant current sources, one connected to the atrium and the other, with delay, to the ventricle.
Inventors
- 👤 Jerome L Krasner
- 👤 Paul Nardella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:26
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/36514; A61N1/36521; A61N1/368
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
43 words
The combination of a first means responsive to a separate but normally heart-related physiological function and a cardiac pacer, said means controlling the output frequency of said pacer and Comprising in series an impedance/voltage converter, a frequency/DC converter, and a DC/pulse rate oscillator.
Claim 2
Dependent Claim
43 words
The combination of a first means responsive to a separate but normally heart-related physiological function and a cardiac pacer, said means controlling the output frequency of said pacer and Comprising in series an impedance/voltage converter, a frequency/DC converter, and a DC/pulse rate oscillator.
Claim 3
Dependent Claim
7 words
Claim 1 wherein said function is respiration.
Claim 4
Dependent Claim
13 words
Claim 1 wherein a constant current source connects said oscillator to said pacer.
Claim 5
Dependent Claim
55 words
Claim 1 wherein said pacer includes a first constant current source whose output is adapted for connection to the atrium, a second constant current source whose output is adapted for connection to the ventricle, and a second means for delaying the output of the second source with respect to the output of said first source.
Claim 6
Dependent Claim
18 words
Claim 4, wherein said second means provides a delay which is a function of artificially stimulated atrial frequency.
Claim 7
Dependent Claim
39 words
Claim 1 wherein said pacer comprises a first output adapted for connection to the atrium, a second output adapted for connection to the ventricle, and a second means for delaying the second output with respect to the first output.
Claim 8
Dependent Claim
18 words
Claim 6 wherein said second means provides a delay which is a function of artificially stimulated atrial frequency.
Claim 9
Dependent Claim
84 words
Claim 1 wherein said combination comprises an impedance/voltage converter, the output of which is fed to a frequency/DC converter, whose output voltage is fed to a DC/pulse rate oscillator, which branches into two constant current sources; the output of one said source being adapted for connection to the atrium, the output of the second said source being adapted for connection to the ventricle; second means being provided for delaying the output of said second source with respect to the output of said first source.
Claim 10
Dependent Claim
18 words
Claim 8 wherein said second means provides a delay which is a function of artificially stimulated atrial frequency.
Claim 11
Dependent Claim
51 words
A cardiac pacer which includes two constant current sources, one whose output is adapted for connection to the atrium and a second whose output is adapted for connection to the ventricle; means being provided for delaying the output of said second source with respect to the output of said first source.
Claim 12
Dependent Claim
51 words
A cardiac pacer which includes two constant current sources, one whose output is adapted for connection to the atrium and a second whose output is adapted for connection to the ventricle; means being provided for delaying the output of said second source with respect to the output of said first source.
Claim 13
Dependent Claim
17 words
Claim 10, wherein said means provides a delay which is a function of artificially stimulated atrial frequency.
References Cited (Backward Citations)
US3358690A
Cited
US3433228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |