Sense amplifier for demand cardiac pacemaker

Details Sense amplifier for demand cardiac pacemaker Sense amplifier for demand cardiac pacemaker

1978-11-06

1981-05-12

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

042665515

ABSTRACT:
A cardiac pacemaker of the type responsive to heart activity to affect the operation of the pacemaker. Detecting circuitry detects the presence of signals representative of natural heart activity. In a preferred embodiment, bias circuitry establishes the sensitivity of the detecting circuit, the sensitivity being altered during the provision of an output signal to enhance the response of the detecting circuit to the natural heart activity representative signals. In essence, hysteresis is provided in that the sensitivity of the detecting circuit is increased during initiation of the output signal and reduced during termination of that signal.

REFERENCES:
patent: 3678937 (1972-07-01), Cole et al.
patent: 3718909 (1973-02-01), Greatbatch
patent: 3927677 (1975-12-01), Gobeli et al.
patent: 4114627 (1978-09-01), Leuyn et al.

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