US3867949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cardiac pacer with voltage doubler output circuit
Assignee: Cardiac Pacemakers Inc
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Filing: 1973-04-27
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Granted: 1975-02-25
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Expires: 1993-04-27
Abstract
Abstract A pulse generating circuit suitable for use in an implanted cardiac pacer is described. In its simplest form, the invention comprises a long life, direct current energy source which is connected to an astable multivibrator which produces output pulses of a predetermined duration at a prescribed frequency. Connected to the output of the multivibrator is a voltage multiplying circuit which serves to increase the amplitude of the output pulses from the multivibrator. By employing a novel constant current source in the multivibrator, extremely stable operation is obtained over the useful life of the battery. Further, because of the novel design of the voltage multiplier circuit, the overall efficiency of the pulse generating circuit exceeds that of known prior art devices designed for a similar purpose.
Inventors
- 👤 Arthur W Schwalm
- 👤 Jon A Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:25
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
510 words
A cardiac pacer circuit comprising in combination: a. a constant current source including (1) a source of direct current potential of a predetermined voltage value having first and second terminals, 2. a series circuit connected between said first and second terminals including first and second resistors and first and second transistors, each having an emitter electrode, a collector electrode and a base electrode, the emitter electrode of said first transistor being connected to the collector and base electrode of said second transistor, the base and collector electrodes of said first transistor being coupled through said first resistor of said first terminal of said source and the emitter electrode of said second transistor being coupled through said second resistor to said second terminal of said source, 3. a third transistor having an emitter, a collector and a base electrode, the base electrode of said third transistor being connected to the emitter electrode of said first transistor and the emitter electrode of said third transistor being coupled to the emitter electrode of said second transistor, b. an astable multivibrator including: 1. a third resistor and a first capacitor connected in series between said collector electrode of said third transistor and said first terminal of said source, 2. fourth, fifth and sixth transistors each having a base, emitter and collector electrodes, the emitter electrode of said fourth transistor being connected to the emitter electrode of said second transistor, the collector electrode of said fourth transistor being connected to the junction between said third resistor and first capacitor and coupled to the base electrode of said fifth transistor, the emitter electrode of said fifth transistor being connected to the first terminal of said source and the collector electrode of said fifth transistor being coupled through fourth resistor means to the collector electrode of said third transistor and the base electrode of said sixth transistor, said collector electrode of said sixth transistor being connected to the base electrode of said fourth transistor, said emitter electrode of said sixth transistor being coupled to said first terminal of said source, c. a voltage doubler circuit including: 1. seventh and eighth transistors, each having an emitter electrode, a collector electrode a base electrode, said base electrode of said seventh transistor being coupled to said junction, the emitter electrode of said seventh transistor being connected to said first terminal of said source, said collector electrode of said seventh transistor being coupled to said second terminal of said source by means of a fifth resistor and coupled to said base electrode of said eighth transistor, 2. said emitter terminal of said eighth transistor being coupled to said second terminal of said source, a sixth resistor coupling said collector terminal of said eighth transistor to said first terminal of said source, and d. a pair of output electrodes 1. a first of said pair of electrodes being connected to the collector electrode of said seventh transistor, 2. the second of said pair of output electrodes being connected in series with second capacitor means of said collector electrode of said eighth transistor.
Claim 2
Dependent Claim
510 words
A cardiac pacer circuit comprising in combination: a. a constant current source including (1) a source of direct current potential of a predetermined voltage value having first and second terminals, 2. a series circuit connected between said first and second terminals including first and second resistors and first and second transistors, each having an emitter electrode, a collector electrode and a base electrode, the emitter electrode of said first transistor being connected to the collector and base electrode of said second transistor, the base and collector electrodes of said first transistor being coupled through said first resistor of said first terminal of said source and the emitter electrode of said second transistor being coupled through said second resistor to said second terminal of said source, 3. a third transistor having an emitter, a collector and a base electrode, the base electrode of said third transistor being connected to the emitter electrode of said first transistor and the emitter electrode of said third transistor being coupled to the emitter electrode of said second transistor, b. an astable multivibrator including: 1. a third resistor and a first capacitor connected in series between said collector electrode of said third transistor and said first terminal of said source, 2. fourth, fifth and sixth transistors each having a base, emitter and collector electrodes, the emitter electrode of said fourth transistor being connected to the emitter electrode of said second transistor, the collector electrode of said fourth transistor being connected to the junction between said third resistor and first capacitor and coupled to the base electrode of said fifth transistor, the emitter electrode of said fifth transistor being connected to the first terminal of said source and the collector electrode of said fifth transistor being coupled through fourth resistor means to the collector electrode of said third transistor and the base electrode of said sixth transistor, said collector electrode of said sixth transistor being connected to the base electrode of said fourth transistor, said emitter electrode of said sixth transistor being coupled to said first terminal of said source, c. a voltage doubler circuit including: 1. seventh and eighth transistors, each having an emitter electrode, a collector electrode a base electrode, said base electrode of said seventh transistor being coupled to said junction, the emitter electrode of said seventh transistor being connected to said first terminal of said source, said collector electrode of said seventh transistor being coupled to said second terminal of said source by means of a fifth resistor and coupled to said base electrode of said eighth transistor, 2. said emitter terminal of said eighth transistor being coupled to said second terminal of said source, a sixth resistor coupling said collector terminal of said eighth transistor to said first terminal of said source, and d. a pair of output electrodes 1. a first of said pair of electrodes being connected to the collector electrode of said seventh transistor, 2. the second of said pair of output electrodes being connected in series with second capacitor means of said collector electrode of said eighth transistor.
Claim 3
Dependent Claim
94 words
a series circuit connected between said first and second terminals including first and second resistors and first and second transistors, each having an emitter electrode, a collector electrode and a base electrode, the emitter electrode of said first transistor being connected to the collector and base electrode of said second transistor, the base and collector electrodes of said first transistor being coupled through said first resistor of said first terminal of said source and the emitter electrode of said second transistor being coupled through said second resistor to said second terminal of said source,
Claim 4
Dependent Claim
94 words
a series circuit connected between said first and second terminals including first and second resistors and first and second transistors, each having an emitter electrode, a collector electrode and a base electrode, the emitter electrode of said first transistor being connected to the collector and base electrode of said second transistor, the base and collector electrodes of said first transistor being coupled through said first resistor of said first terminal of said source and the emitter electrode of said second transistor being coupled through said second resistor to said second terminal of said source,
Claim 5
Dependent Claim
41 words
said emitter terminal of said eighth transistor being coupled to said second terminal of said source, a sixth resistor coupling said collector terminal of said eighth transistor to said first terminal of said source, and d. a pair of output electrodes
Claim 6
Dependent Claim
41 words
said emitter terminal of said eighth transistor being coupled to said second terminal of said source, a sixth resistor coupling said collector terminal of said eighth transistor to said first terminal of said source, and d. a pair of output electrodes
Claim 7
Dependent Claim
24 words
the second of said pair of output electrodes being connected in series with second capacitor means of said collector electrode of said eighth transistor.
Claim 8
Dependent Claim
24 words
the second of said pair of output electrodes being connected in series with second capacitor means of said collector electrode of said eighth transistor.
Claim 9
Dependent Claim
144 words
fourth, fifth and sixth transistors each having a base, emitter and collector electrodes, the emitter electrode of said fourth transistor being connected to the emitter electrode of said second transistor, the collector electrode of said fourth transistor being connected to the junction between said third resistor and first capacitor and coupled to the base electrode of said fifth transistor, the emitter electrode of said fifth transistor being connected to the first terminal of said source and the collector electrode of said fifth transistor being coupled through fourth resistor means to the collector electrode of said third transistor and the base electrode of said sixth transistor, said collector electrode of said sixth transistor being connected to the base electrode of said fourth transistor, said emitter electrode of said sixth transistor being coupled to said first terminal of said source, c. a voltage doubler circuit including:
Claim 10
Dependent Claim
144 words
fourth, fifth and sixth transistors each having a base, emitter and collector electrodes, the emitter electrode of said fourth transistor being connected to the emitter electrode of said second transistor, the collector electrode of said fourth transistor being connected to the junction between said third resistor and first capacitor and coupled to the base electrode of said fifth transistor, the emitter electrode of said fifth transistor being connected to the first terminal of said source and the collector electrode of said fifth transistor being coupled through fourth resistor means to the collector electrode of said third transistor and the base electrode of said sixth transistor, said collector electrode of said sixth transistor being connected to the base electrode of said fourth transistor, said emitter electrode of said sixth transistor being coupled to said first terminal of said source, c. a voltage doubler circuit including:
Claim 11
Dependent Claim
52 words
a third transistor having an emitter, a collector and a base electrode, the base electrode of said third transistor being connected to the emitter electrode of said first transistor and the emitter electrode of said third transistor being coupled to the emitter electrode of said second transistor, b. an astable multivibrator including:
Claim 12
Dependent Claim
52 words
a third transistor having an emitter, a collector and a base electrode, the base electrode of said third transistor being connected to the emitter electrode of said first transistor and the emitter electrode of said third transistor being coupled to the emitter electrode of said second transistor, b. an astable multivibrator including:
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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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |