Patent ID: 6650940
Filing Date: 2003-11-18
Classification: A61N

Abstract:
A cardiac rhythm management device capable of functioning in a preset stimulation and/or autocapture mode having preset stimulation rates and timing intervals, said rhythm management device comprising:a pulse generator that generates a stimulation pulse for delivery to at least one of an atrium and a ventricle of a heart; an accelerometer that transmits a signal associated with accelerations of the heart; a controller electrically coupled to said pulse generator and said accelerometer, said controller identifying heart sounds from the signal of the accelerometer over corresponding cardiac cycles and further determining whether an identified heart sound is associated with delivery of the stimulation pulse to the heart; wherein said controller includes a detection window having a predefined duration; wherein said controller determines a maximum output of said signal of the accelerometer for at least one cardiac cycle; and wherein a center of the detection window is aligned with a determined maximum output of said signal of the accelerometer during a first cardiac cycle.