Method and apparatus for effecting automatic ventricular defibri

Details Method and apparatus for effecting automatic ventricular defibri Method and apparatus for effecting automatic ventricular defibri

1980-02-11

1981-11-17

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

043005675

ABSTRACT:
A method and apparatus for effecting automatic ventricular defibrillation and/or demand cardioversion comprises an implanted automatic defibrillator having a normal (ventricular defibrillation) mode of operation and a cardioverting (demand cardioversion) mode of operation. One embodiment of the invention includes a simulated fibrillation source, externally located, for applying a simulated fibrillation signal to the patient via corresponding electrodes, the internal automatic defibrillator detecting the simulated fibrillation signal and responding thereto so as to apply a defibrillating voltage (in the normal mode) or a cardioverting voltage (in the cardioverting mode) to the heart of the patient. Another embodiment of the invention also includes an external command system, by means of which the implanted automatic defibrillator is actuated from the normal mode to the cardioverting mode, to reduce the discharge energy level, to cardiovert in synchronization with the QRS complex, or both.

REFERENCES:
patent: 3756245 (1973-09-01), Thaler et al.
patent: 3805795 (1974-04-01), Denniston et al.
patent: 3857398 (1974-12-01), Rubin
patent: 3881493 (1975-05-01), Cannon
patent: 3952750 (1976-04-01), Mirowski et al.
Trevino et al., "American Heart Journal" vol. 81, No. 1, Jan. 1971, pp. 20-28.
Schuder et al., "Transactions of the American Society for Artificial Internal Organs" vol. 16, 1970, pp. 207-212.

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