Stimulation/sensing electrode fixation device and electrical lead

An implantable medical lead comprising:

• a flexible, tubular lead body including a proximal end and a distal end;
• a connector assembly connector disposed at the proximal end;
• an electrical conductor extending through the tubular body from the connector assembly to the distal end;
• and
• a device for the active fixation of the implantable medical lead, the device disposed at the distal end of the lead, the device including:
• a housing including a proximal end connected to the distal end of the lead body, and a distal end opposite the proximal end of the housing, the housing defining a housing lumen having a longitudinal axis extending between the proximal end of the housing and the distal end of the housing, the housing including a plurality of longitudinal slots disposed radially outward of the housing lumen;
• a tine assembly including a carrier member partially disposed within the housing lumen, and a plurality of tines coupled to the carrier member, each of the tines disposed within a respective one of the longitudinal slots and configured to self-bias from a linear configuration within the housing to a curved configuration outside of the housing, wherein the carrier member includes a lobe at an outer circumference of the carrier member, the lobe configured to engage one of the plurality of longitudinal slots to prevent rotation of the carrier member relative to the housing while permitting the carrier member to move axially through the housing lumen, wherein one of the plurality of tines is connected to and projects from the lobe;
• a rotatable shaft extending through the housing lumen, the shaft having a proximal end and a distal end and being configured to engage the carrier member such that rotation of the shaft causes longitudinal movement of each of the tines relative to the housing;
• and
• a conical tip electrode attached to the distal end of the rotatable shaft.