Systems and methods for making and using tip electrodes for leads of electrical stimulation systems

An implantable electrical stimulation lead, comprising:

• a lead body having a proximal end portion, a distal end portion, a distal tip, and a longitudinal length;
• a plurality of electrodes disposed along the distal end portion of the lead body, the plurality of electrodes comprising a tip electrode disposed on the distal tip of the lead body, the tip electrode comprising
• an electrode body having an outer stimulating surface, a proximal end, a closed distal end, a circumference, and a longitudinal length, and
• an internal lumen defined in the electrode body and extending inwardly from an opening in the proximal end of the electrode body, the internal lumen defining a plurality of longitudinal grooves formed along the internal lumen and extending deeper into the electrode body than adjacent portions of the internal lumen, each of the plurality of longitudinal grooves extending along the internal lumen in a direction that is parallel to the longitudinal length of the electrode body,
• wherein a portion of the lead body is disposed within the internal lumen and into the plurality of longitudinal grooves through the opening in tire proximal end of the electrode body, wherein the portion of the lead body within the internal lumen and the plurality of longitudinal grooves facilitates retention of the tip electrode on the distal tip of the lead body;
• a plurality of terminals disposed along the proximal end portion of the lead body;
• and
• a plurality of conductors, each conductor of the plurality of conductors electrically coupling each of the plurality of terminals to at least one of the plurality of electrodes.