Automatic cardioverting circuit

Details Automatic cardioverting circuit Automatic cardioverting circuit

1978-05-01

1980-08-26

Kamm, William E.

Surgery

Truss

Pad

A61N 132

Patent

active

RE0303879

ABSTRACT:
Pulse generating apparatus which provides electrical heart-stimulating pulses only in the absence of normal heart activity. If the patient's heart has developed a life threatening arrhythmic condition the inventive apparatus automatically applies an electrical shock to the heart having sufficient magnitude to restore normal heart activity. The inventive apparatus features a redundant heartbeat sensing system which monitors two dynamic characteristics of heart function, for example, heart contraction and EKG. An electrical heart stimulating pulse is delivered to the patient's heart following the elapse of a specified period of time since the sensing of a dynamic characteristic indicative of a normal functional heart. Sensing control is automatically regained following successful heart stimulation, thereby inhibiting the application of further electrical pulses. In the event that the patient's heart fails to resume normal heartbeat action, the inventive apparatus will continue delivering intermittant shocks--a lower energy pulse is applied first followed by higher energy pulses.

REFERENCES:
patent: 2976865 (1961-03-01), Shipley
patent: 3144019 (1964-08-01), Haber
patent: 3323367 (1967-06-01), Searle
patent: 3389704 (1968-06-01), Buchowski et al.
patent: 3608545 (1971-09-01), Novack et al.
patent: 3614954 (1971-10-01), Mirowski et al.
patent: 3638656 (1972-02-01), Grandjean et al.
patent: 3680544 (1972-08-01), Shinnick et al.
patent: 3716059 (1973-02-01), Welborn et al.
patent: 3815611 (1974-06-01), Denniston
Schuder et al., "Transactions of the American Society for Artificial Internal Organs", vol. XVI, 1970, pp. 207-212.
Stratbucker et al., "Rocky Mountain Engineering Society", 1965, pp. 57-61.

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