Demand cardiac pacemaker having reduced polarity disparity

Details Demand cardiac pacemaker having reduced polarity disparity Demand cardiac pacemaker having reduced polarity disparity

1981-01-16

1982-11-09

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

043579434

ABSTRACT:
A cardiac pacemaker of the type responsive to heart activity to affect the operation of the pacemaker. Detecting circuitry is provided having a differential input and an essentially polarity independent degree of response to sensed signals. A single polarity output signal is provided representative of sensed signals of either polarity. In a preferred embodiment, a differential input and differential output preamplifier is responsive to sensed signals to provide output signals of opposite polarity but like absolute value. An absolute value circuit responds to the opposite polarity signals to provide a single polarity output signal, the output signal being the same polarity without regard to the polarity of the sensed signals.

REFERENCES:
patent: 3528428 (1970-09-01), Berkovits
patent: 3949759 (1976-04-01), Brownlee et al.
patent: 4275737 (1981-06-01), Thompson et al.

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