US3554198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Patient-isolating circuitry for cardiac facing device
Assignee: CARDIAC ELECTRONICS Inc
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Filing: 1967-08-04
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Granted: 1971-01-12
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Expires: 1987-08-04
Abstract
Abstract A circuit for isolating a cardiac pulsing device from a periodic timing source to prevent stray voltages from being transmitted to a cardiac patient including a high speed relay having a solenoid in series with a resistor to form a primary circuit and the relay contacts in series with a battery to form a secondary circuit which provides the voltage for stimulating the heart of a cardiac patient, with the secondary circuit including variable resistor means for varying the voltage supplied to the patient and a built-in test circuit associated for periodically testing the battery to insure that it possesses sufficient voltage for providing adequate stimulation.
Inventors
- 👤 George Tatoian
- 👤 Richard R Ceier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:55
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/3625; Y; Y10; Y10S; Y10S128/00; Y10S128/908
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
An isolating unit for utilizing a periodic timing source to drive a cardiac pulsing device while electrically isolating said pulsing device from said timing source to thereby prevent stray voltages from said timing source from being transmitted to a cardiac patient comprising a primary circuit including a solenoid, first lead means for coupling said solenoid to said timing source, a secondary circuit including a switch operable by said solenoid in response to the energization of said primary circuit by said periodic timing source, said switch being electrically iSolated from said first circuit, a battery in said second circuit coupled to said switch, second lead means in said second circuit for effectively coupling said battery to a cardiac patient for applying an electric voltage to said patient on the closing of said switch whereby stray voltages in said timing source are not transmitted to said cardiac patient, said solenoid and switch means comprising a reed relay, and resistance means in series with said solenoid for speeding up the action of said relay.
Claim 2
Dependent Claim
171 words
An isolating unit for utilizing a periodic timing source to drive a cardiac pulsing device while electrically isolating said pulsing device from said timing source to thereby prevent stray voltages from said timing source from being transmitted to a cardiac patient comprising a primary circuit including a solenoid, first lead means for coupling said solenoid to said timing source, a secondary circuit including a switch operable by said solenoid in response to the energization of said primary circuit by said periodic timing source, said switch being electrically iSolated from said first circuit, a battery in said second circuit coupled to said switch, second lead means in said second circuit for effectively coupling said battery to a cardiac patient for applying an electric voltage to said patient on the closing of said switch whereby stray voltages in said timing source are not transmitted to said cardiac patient, said solenoid and switch means comprising a reed relay, and resistance means in series with said solenoid for speeding up the action of said relay.
Claim 3
Dependent Claim
35 words
A circuit as set forth in claim 1 including second resistance means coupled across said solenoid for discharging the voltage across said solenoid coil upon the termination of flow of current into said primary circuit.
Claim 4
Dependent Claim
222 words
An isolating unit for utilizing a periodic timing source to drive a cardiac pulsing device while electrically isolating said pulsing device from said timing source to thereby prevent stray voltages from said timing source from being transmitted to a cardiac patient comprising a primary circuit including a solenoid, first lead means for coupling said solenoid to said timing source, a secondary circuit including a switch operable by said solenoid in response to the energization of said primary circuit by said periodic timing source, said switch being electrically isolated from said first circuit, a battery in said second circuit coupled to said switch, second lead means in said second circuit for effectively coupling said battery to a cardiac patient for applying an electric voltage to said patient on the closing of said switch whereby stray voltages in said timing source are not transmitted to said cardiac patient, said solenoid and switch means comprising a reed relay, means for varying the amount of current flowing in said secondary circuit, a test circuit coupled across said battery for determining whether said battery voltage is in excess of a predetermined value to thereby assure the providing of sufficient voltage in said secondary circuit upon the closing of said switch means, and resistance means in series with said solenoid for speeding up the action of said relay.
Claim 5
Dependent Claim
222 words
An isolating unit for utilizing a periodic timing source to drive a cardiac pulsing device while electrically isolating said pulsing device from said timing source to thereby prevent stray voltages from said timing source from being transmitted to a cardiac patient comprising a primary circuit including a solenoid, first lead means for coupling said solenoid to said timing source, a secondary circuit including a switch operable by said solenoid in response to the energization of said primary circuit by said periodic timing source, said switch being electrically isolated from said first circuit, a battery in said second circuit coupled to said switch, second lead means in said second circuit for effectively coupling said battery to a cardiac patient for applying an electric voltage to said patient on the closing of said switch whereby stray voltages in said timing source are not transmitted to said cardiac patient, said solenoid and switch means comprising a reed relay, means for varying the amount of current flowing in said secondary circuit, a test circuit coupled across said battery for determining whether said battery voltage is in excess of a predetermined value to thereby assure the providing of sufficient voltage in said secondary circuit upon the closing of said switch means, and resistance means in series with said solenoid for speeding up the action of said relay.
Claim 6
Dependent Claim
35 words
A circuit as set forth in claim 3 including second resistance means coupled across said solenoid for discharging the voltage across said solenoid coil upon the termination of flow of current into said primary circuit.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |