Circuit for controlled commutation of multiplexed electrodes for an active implantable medical device

A circuit for controlled commutation of multiplexed electrodes for an active implantable medical device, comprising

• a pulse generator;
• a lead comprising multiplexed electrodes for sensing/pacing connected to the pulse generator;
• at least one proximal terminal and/or distal terminal, able to be coupled to the pulse generator;
• a plurality of electrode terminals, wherein each electrode terminal may be respectively coupled to a multiplexed electrode for sensing/pacing of the lead;
• a plurality of switches wherein each switch has a closed position, in which a corresponding electrode terminal is connected to the proximal terminal or the distal terminal, and an open position, in which a corresponding electrode terminal is isolated from the proximal terminal and the distal terminal;
• and
• command means, comprising means for:
• receiving a modulated signal from the generator, wherein the modulated signal comprises a coded series of logic pulses, at the proximal terminal and/or the distal terminal;
• decoding the modulated signal to actuate the switches corresponding to a configuration of closed or open positions as defined by the modulated signal;
• detecting a micropulse within the received modulated signal, wherein the micropulse precedes the coded series of logic pulses and presents an amplitude and duration lower than the amplitude and duration of each of the logic pulses;
• and
• activating, in response to the micropulse, all the switches being in an open position over a duration at least equal to the duration of receiving the coded series of logic pulses.