Patent ID: 8688238

Claim:
An apparatus comprising: an implantable medical elongated member configured to couple to a medical device to deliver a therapy from the medical device to a target therapy delivery site in a patient, the elongated member extending between a proximal end and a distal end and defining an outer surface extending between the proximal end and the distal end, the outer surface comprising: a first outer surface portion, and a second outer surface portion extending around at least ten percent of an outer perimeter of the elongated member, wherein the second outer surface portion is at least partially axially aligned with the first outer surface portion, and the elongated member comprises a plurality of stimulation electrodes positioned along the outer surface; a first fixation element extending a first distance from the first outer surface portion of the implantable medical elongated member, wherein a longitudinally-extending section of the second outer surface portion proximate to the distal end of the elongated member and extending around at least ten percent of the outer perimeter of the elongated member is substantially devoid of any fixation elements that extend the first distance from the second outer surface portion; and a second fixation element extending a second distance from the second outer surface portion of the implantable medical elongated member, wherein the first distance is greater than the second distance, wherein the elongated member has a circular cross-section defining a first quadrant of the outer surface, a second quadrant of the outer surface, a third quadrant of the outer surface, and a fourth quadrant of the outer surface, and the first fixation element extends from at least one of the first, second or third quadrants, and the fourth quadrant of the outer surface is devoid of any fixation elements that extend the first distance from the outer surface.