| 摘要 |
An atrial-ventricular demand pacemaker (10) having improved atrial pulse artifact rejection includes a blanking circuit (30) connected in the signal path from the ventricular output terminal (17) to the sensing amplifier (21) to blank the signal during an atrial pulse. The blanking circuit (30) includes a holding circuit comprising a low-pass filter and a switching element which stores a prior signal value at the sensing amplifier input during the blanking interval, and delays return to normal operation until after the banking circuit has returned to normal. Artifact rejection may also be 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. |
