Patent ID: 8478430
Filing Date: 2013-07-02
Classification: A61N

Abstract:
1. A medical electrical lead comprising: an elongated body having a proximal portion and a distal portion; a helical fixation member extending from the distal portion of the elongated body, the helical fixation member having a distal tip for fixedly engaging the distal portion of the elongated body at an implant site, and the distal portion of the elongated body extending through the helical fixation member and distally from the distal tip of the helical fixation member, wherein the distal portion extending through the helical fixation has an outer diameter; and wherein the helical fixation member includes a first winding diameter along a proximal portion of the helical fixation member and a second winding diameter, greater than the first winding diameter and greater than said outer diameter of the distal portion of the lead body and extending along distal portion of the helical fixation member, a tissue engaging gap extending between the helical fixation member and the lead body along the distal portion of the helical fixation member; and the first winding diameter of the helical fixation member proximal portion forms a mechanical stop for resisting further advancement of the helical fixation member into the tissue.