Patent ID: 8670843

Claim:
An implantable quadripolar cardiac lead comprising: a) an elongated lead body having opposed proximal and distal end portions and having an interior lumen extending therethrough; b) an axially rotatable retractable and extendable fixation helix operatively associated with the distal end portion of the lead body; c) an in-line quadripolar connector assembly operatively associated with the proximal end portion of the lead body and including an elongated rotatable pin electrode having opposed proximal and distal end portions; and d) an elongated torque transmitting conductor coil extending through the interior lumen of the lead body and having a proximal end portion connected to the distal end portion of the rotatable pin electrode and a distal end portion connected to the rotatable fixation helix, to facilitate manual activation of the fixation helix, wherein the fixation helix is electrically connected to the rotatable pin electrode, wherein the connector assembly includes an elongated inner support shaft supporting a stack of axially spaced apart electrode rings separated from one another by a corresponding plurality of axially spaced apart insulator rings, wherein each electrode ring of the connector assembly is in electrical communication with a corresponding ring electrode associated with the distal end portion of the lead body, wherein the inner support shaft is engaged to the stack of electrode rings for non-rotation of the electrode rings relative to the inner support shaft, and wherein the rotatable pin electrode is engaged for rotation relative to the inner support shaft for actuation of the fixation helix.