Patent ID: 8903512

Claim:
A medical system, comprising: an implantable cardiac pacing pulse generator; a first lead, comprising an elongated lead body including a first elongated insulated conductor and a first connector formed at a proximal end thereof; the connector including a first electrical contact electrically coupled at a first polarity to the pacing pulse generator; a second lead, comprising an elongated lead body including a second elongated insulated conductor and a second connector formed at a proximal end thereof; the connector including a second electrical contact electrically coupled at a second polarity to the pacing pulse generator, the pacing pulse generator comprising means for delivering pulses between the first and second electrical contacts; a first pacing electrode joined to the first lead body and coupled to the first contact of the first connector via the first conductor, the first electrode adapted for intimate contact with tissue at a first site; a second pacing electrode joined to the second lead body and coupled to the second contact of the second connector via the second conductor, the second electrode adapted for location at a second site; and a porous layer formed over the second electrode, allowing conduction therethrough while preventing contact between the second electrode and tissue in proximity to the second site.