An implantable medical lead comprises an elongated body extending between a proximal end and a distal end, and a helical fixation member extending from the distal end of the elongated body. The helical fixation member is configured to fix the implantable medical lead at an implant site and includes a...http://www.google.co.uk/patents/US7657325?utm_source=gb-gplus-sharePatent US7657325 - Implantable medical lead including a helical fixation member
