ACTIVE IMPLANTABLE MEDICAL DEVICE, IN PARTICULAR A LEADLESS CAPSULE, WITH CYCLE-TO-CYCLE CAPTURE DETECTION BY ANALYSING AN ENDOCARDIAL ACCELERATION SIGNAL

摘要

the device incorporates an acceleration sensor endocardiaque ea. the test circuit receives the signal, capture window (102) and a sample from a limited set of actions, for the duration of a predetermined time window open after issuance of a stimulation pulse (100).an indicator (meanabs) based on an average of the absolute values of the series of successive steps, the steps are calculated at the end of the time window (104) and compared (106) with a predetermined threshold (capthreshold) discrimination.in order to determine the presence or absence (108) to (110) of a capture according to the value of the indicator is above or below the threshold. this indicator is very robust to noise and low calculation, which makes it possible to drastically reduce the consumption of the digital processor and the capsule.