Abstract: A lead assembly comprises a lead body extending from a lead proximal end portion to a lead distal end portion with at least one conductor disposed therein. A lead lumen extends within the lead body and is dimensioned and configured to removably and rotatably seat a driver therein. The driver includes a driver body extending from a driver proximal end to a driver distal end and having a stylet or guidewire lumen disposed therein. An extendable and retractable active fixation mechanism is disposed at the lead distal end portion. The active fixation mechanism is actuatable by rotation of the driver. In one example, the at least one conductor includes a first conductor and a second conductor, in which the first conductor is co-radial with the second conductor. In another example, the driver distal end includes a portion extractably engagable with the lead distal end portion.

Abstract: A cardiac rhythm management system for securing a cardiac lead within a patient's heart is provided. According to the present invention, the cardiac rhythm management system includes a fixation helix for securing and stabilizing the lead at a target location in a patient's heart. The fixation helix is adapted to extend from a first position disposed over the electrode to a second position located distally to the distal end of the cardiac lead.

Abstract: A cardiac rhythm management system for securing a cardiac lead within a patient's heart is provided. According to the present invention, the cardiac rhythm management system includes a fixation helix for securing and stabilizing the lead at a target location in a patient's heart. The fixation helix is adapted to extend from a first position disposed over the electrode to a second position located distally to the distal end of the cardiac lead.