Pacer with automatically variable a-v interval

Abstract From the Canadian patent

Abstract of the Disclosure, An improved atrial synchronous heart pacer includes means for generating an atrio-ventricular (A-V) interval control signal of automatically variable duration which, duration is a function of the sensed atrial heart rate (i.e. P-wave rate). A timing circuit establishes a basic timing interval for the generation of ventricular stimulation pulses which interval may be modified by the control of the A-V interval signal. The A-V interval control signal preferably comprises the output of a P-wave triggered monostable multivibrator. The time constants of the multivibrator's timing circuits are scaled such that operation within the heart-rate range of 55-150 beats per …