Active implantable medical device with a detection of cardiac potentials evoked, in particular atrial potentials

摘要

This device applies a stimulation pulse (40) and short - circuited for a period of discharge (42, ocd) the output circuit comprising a connecting capacitor, the impedance of the probe and the impedance of the myocardium interface - electrode. A detection stage comprises an amplifier and of the blanking means for temporarily decouple the input of amplifier. The sequencers activate a first time (micro - blanking) the blanking circuit for the duration of the stimulation pulse (40), activate the discharging circuit with time after the application of the stimulation pulse, and inhibit the blanking circuit for a listening period (44) defined in at least a part of this time, so as to allow the detection by the amplifier, during the listening period, of the evoked potentials post - stimulation, and then activate a second time (decomposition) the blanking circuit after the listening period, during the course of the discharge period (42, ocd).