US3566876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Defibrillator
Assignee: HP Inc
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Filing: 1967-12-14
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Granted: 1971-03-02
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Expires: 1987-12-14
Abstract
Abstract A monopolar cardiac defibrillator obviates the need for bulky storage capacitors by operating directly from line signal to supply a high power-defibrillating pulse substantially as a halfwave portion of the line signal the defibrillating pulse is generated in timed relationship to a patient''s electrocardiogram by activating a signal-controlled switch to apply a half wave of line signal to the defibrillator circuitry.
Inventors
- 👤 Paul E Stoft
- 👤 Robert F Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:09
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/38; A61N1/39; A61N1/3904; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/346; A61B5/349; A61B5/352
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
Monopolar defibrillator apparatus for applying an electrical signal to a mammalian subject, the apparatus comprising: an input for receiving alternating signal from a source; output means for applying an electrical signal to a subject; a transformer having primary and secondary windings; signal controllable switch means connecting the primary winding of said transformer to said input for applying a selected portion of a half cycle of alternating signal appearing at said input to said transformer in response to a control signal applied to said switch means; circuit means connecting said secondary winding to said output means and including a first diode connected to conduct current in one direction to said output means from said secondary winding for signal therefrom of one polarity, and including a second diode and impedance means in series therewith for conducting current through said second diode and impedance means from said secondary winding for signal therefrom of the opposite polarity; and control means connected to said switch means to apply a control signal thereto at a selected time for applying said selected portion of alternating signal to said transformer.
Claim 2
Dependent Claim
182 words
Monopolar defibrillator apparatus for applying an electrical signal to a mammalian subject, the apparatus comprising: an input for receiving alternating signal from a source; output means for applying an electrical signal to a subject; a transformer having primary and secondary windings; signal controllable switch means connecting the primary winding of said transformer to said input for applying a selected portion of a half cycle of alternating signal appearing at said input to said transformer in response to a control signal applied to said switch means; circuit means connecting said secondary winding to said output means and including a first diode connected to conduct current in one direction to said output means from said secondary winding for signal therefrom of one polarity, and including a second diode and impedance means in series therewith for conducting current through said second diode and impedance means from said secondary winding for signal therefrom of the opposite polarity; and control means connected to said switch means to apply a control signal thereto at a selected time for applying said selected portion of alternating signal to said transformer.
References Cited (Backward Citations)
GB864362A
Cited
US3481341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |