Output pulse artifact rejection in demand pacemakers

Details Output pulse artifact rejection in demand pacemakers Output pulse artifact rejection in demand pacemakers

A - Human Necessities

61

N

326/1.2

A61N 1/365 (2006.01) A61N 1/368 (2006.01) A61N 1/37 (2006.01)

Patent

CA 1159113

ABSTRACT An atrial-ventricular demand pacemaker having improved atrial pulse artifact rejection includes a blanking circuit connected in the signal path from the ventricular output terminal to the sensing amplifier to blank the signal during an atrial pulse. A holding circuit including a low-pass filter and a switching element stores a prior signal value at the sensing amplifier input during the blanking interval, and delays return to normal operation until after the blanking circuit has returned to normal. Artifact rejection is also improved by limiting atrial pulse output circuit recharge time and by limiting polarization current driven into the ventricular output circuitry by an atrial output pulse.

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