An implantable active fixation lead includes an outer sheath, a protector member having a peripheral surface extending between its distal and proximal end surfaces with a helical groove formed in the peripheral surface, and a fixation helix integral with the outer sheath. The fixation helix includes...http://www.google.es/patents/US7840283?utm_source=gb-gplus-sharePatente US7840283 - Bipolar screw-in lead
