Cautery protection circuit for a heart pacemaker

Details Cautery protection circuit for a heart pacemaker Cautery protection circuit for a heart pacemaker

1975-01-24

1976-07-13

Kamm, William E.

Surgery

Truss

Pad

128 21P, A61N 136

Patent

active

039688020

ABSTRACT:
A cautery protection circuit is disclosed for use with a heart pacemaker and comprises circuit elements for preventing those signals induced within the output portion of the heart pacemaker circuit by an electric field established by cautery procedures, from being rendered unsymmetrical in wave form, thereby minimizing the possible adverse effects of such induced signals, e.g. fibrillation of the patient's heart. In one embodiment, a diode is disposed from the emitter to the collector of a pacemaker output transistor to offset the unsymmetrical conduction of the output transistor. In another embodiment, a capacitor of a value presenting an effective short circuit to the frequencies of interest, is inserted across the output transistor to shunt thereabout signals induced by cautery procedures. In addition, the cautery protection circuit includes a suitable inductive element to reduce the high frequency current flow to the pacemaker electrodes to a level below that at which the patient's heart may be excited and further, a capacitor to detune the resonant circuit established by the capacitances of the diodes and the transistor junction, and the inductive element, from the frequencies of interest.

REFERENCES:
patent: 3265956 (1966-08-01), Schlabach
patent: 3518986 (1970-07-01), Woods et al.
patent: 3529211 (1970-09-01), Brayley
patent: 3548294 (1970-12-01), Houghton
patent: 3587562 (1971-06-01), Williams
patent: 3590322 (1971-06-01), Carr
patent: 3768486 (1973-10-01), Berkovits et al.
patent: 3789854 (1974-02-01), Lee

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