Demand cardiac pacemaker having reduced polarity disparity

摘要

A cardiac pacemaker of the type responsive to a natural heart activity for affecting the operation of the pacemaker. Circuitry is provided which has an essentially polarity independent degree of response to sensed signals. In a preferred embodiment, the circuitry includes a differential input and a differential output, the output signals being of opposite polarity but of the same absolute value and being representative of sensed signals.