Patent ID: 7949411

Claim:
An implantable electrical lead, comprising: an elongate flexible lead body having a distal end, a distal portion and an inner lumen extending therethrough; a resilient distal loop extending from the distal end of the lead body, the distal loop having a permanently closed configuration and configured to resiliently resume an expanded closed-loop shape after being straightened into a collapsed closed-loop shape for deployment within a patient's body, wherein the distal loop in a relaxed non-deformed state lies substantially within a plane; a shaping lumen extending through at least one side of the distal loop in fluid communication with the inner lumen of the lead body; a stop disposed in the shaping lumen and configured to block further advancement of a stylet through the shaping lumen; a distal defibrillation electrode disposed on the distal loop; a proximal connector disposed at a proximal end of the lead body having a conductive terminal and an inner lumen in fluid communication with the inner lumen of the lead body; an elongate conductor disposed and in electrical communication between the distal electrode and a conductive terminal disposed on the proximal connector; and a flexible resilient shaft extending from the distal end of the lead body so as to extend into the area bounded by the closed configuration of the distal loop, the shaft having a preformed shape defining a first apex on a first side of the plane of the distal loop and a second apex an a second side of the plane of the distal loop opposite the first side of the distal loop.