Variable p-r interval pacemaker

Details Variable p-r interval pacemaker Variable p-r interval pacemaker

A - Human Necessities

61

N

326/1.2

A61N 1/36 (2006.01) A61N 1/362 (2006.01) A61N 1/365 (2006.01) A61N 1/368 (2006.01)

Patent

CA 1083674

VARIABLE P-R INTERVAL PACEMAKER ABSTRACT A pacemaker has circuitry which allows the time between the detection of an atrial contraction and the provision of an electrical stimulus to cause a ventricular contraction to vary with the rate of the sensed atrial contractions. The circuitry includes a differential amplifier having a reference voltage applied to one input and a capacitor coupled to the second input. The capacitor is charged from the time the atrial contraction is sensed to the time the charge equals the reference vol- tage, at which time the electrical stimulus is provided and the capacitor is discharged between the time the elec- trical stimulus is provided and the next atrial contraction is sensed. As the heart rate increases, the time between the atrial contractions decreases, and thus the capacitor discharges for a shorter time, or in other words, to a larger voltage and the time required for the capacitor to recharge to the reference voltage becomes less.

272993

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