Patent ID: 6134471
Filing Date: 2000-10-17
Classification: A61N

Abstract:
A rate-adaptive pacemaker comprising:a stimulation pulse generator for stimulating at least the ventricle of a heart;output means connected to said stimulation pulse generator for supplying a stimulation pulse to said heart;a heart-signal input stage for detecting the shape of evoked heart signals;a rate calculation device, receiving as input an output from said heart-signal input stage and providing an output to said stimulation pulse generator, said output including a rate-control signal, said rate calculation device calculating a stimulation rate based on physiological stress of an individual in whom the pacemaker is implanted and including a signal-amplitude processing unit for calculating the rate-control signal in response to heart signal amplitude values at predetermined times during a specified heart cycle, said heart signal amplitude values derived in connection with said shape of evoked heart signals.