Quadripolar connector assembly for active fixation cardiac leads

1. 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.

2. An implantable quadripolar cardiac lead as recited in claim 1 , wherein the fixation helix is electrically connected to the elongated torque transmitting coil and the elongated torque transmitting coil is covered by a heat shrink tube.

3. An implantable quadripolar cardiac lead as recited in claim 1 , wherein a proximal end portion of the rotatable pin electrode is one of four electrodes of the connector assembly.

4. An implantable quadripolar cardiac lead as recited in claim 1 , wherein the quadripolar connector assembly includes a proximal-most insulator ring that is threadably engaged with a proximal end portion of the inner support shaft.

5. An implantable quadripolar cardiac lead as recited in claim 1 , wherein a cylindrical hull is secured to the distal end portion of the pin electrode, proximal to the connection of the pin electrode and torque transmitting conductor coil, to support rotation of the pin electrode relative to the support shaft.

6. An implantable quadripolar cardiac lead as recited in claim 5 , wherein the hull in accommodated for rotation within a recess formed in a distal end portion of the support shaft.

7. An implantable quadripolar cardiac lead as recited in claim 5 , wherein the elongated support shaft includes three circumferentially spaced apart side channels, and wherein each side channel is adapted and configured to accommodate conductive wires communicating with at least one of the axially spaced apart electrode rings.

8. 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 electrically active axially rotatable 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) torque transmitting means extending through the interior lumen of the lead body, electrically connecting the rotatable pin electrode to the rotatable fixation helix, for facilitating manual rotation of the fixation helix, 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.

9. An implantable quadripolar cardiac lead as recited in claim 8 , wherein the torque transmitting means comprises a helical coil.

10. An implantable quadripolar cardiac lead as recited in claim 9 , wherein the helical coil is covered by a heat shrink tube.

11. An implantable quadripolar cardiac lead as recited in claim 9 , wherein a proximal end portion of the rotatable pin electrode is one of four electrodes of the connector assembly.

12. An implantable quadripolar cardiac lead as recited in claim 11 , wherein the quadripolar connector assembly includes a proximal-most insulator ring that is threadably engaged with a proximal end portion of the inner support shaft.

13. An implantable quadripolar cardiac lead as recited in claim 11 , wherein a cylindrical hull is secured to the distal end portion of the pin electrode, proximal to the connection of the pin electrode and the coil, to support rotation of the pin electrode relative to the support shaft.

14. An implantable quadripolar cardiac lead as recited in claim 13 , wherein the hull is accommodated for rotation within a recess formed in a distal end portion of the support shaft.

15. An implantable quadripolar cardiac lead as recited in claim 13 , wherein the elongated support shaft includes three circumferentially spaced apart side channels, and wherein each side channel is adapted and configured to accommodate conductive wires communicating with at least one of the axially spaced apart electrode rings of the connector assembly.

16. 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 electrically active axially rotatable fixation helix and three axially spaced apart ring electrodes 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 a stack of three 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; 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 connector assembly includes an elongated inner support shaft supporting the stack of axially spaced apart electrode rings separated from one another by a corresponding plurality of axially spaced apart insulator rings, 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.

17. An implantable quadripolar cardiac lead as recited in claim 16 , wherein the connector assembly includes a proximal-most insulator ring that is threadably engaged with a proximal end portion of the inner support shaft.

18. An implantable quadripolar cardiac lead as recited in claim 16 , wherein a cylindrical hull is secured to the distal end portion of the pin electrode and is accommodated within a recess formed in the distal end portion of the support shaft, proximal to the connection of the pin electrode and the coil, to support rotation of the pin electrode relative to the support shaft.