An implantable electrical stimulation lead includes an integrated fixation
mechanism that expands upon implantation of the lead to fix the lead
relative to a target tissue site, such as tissue within the epidural
region proximate the spine or the sacral foramen. The fixation mechanism
may include one or more expandable wire-like elements, which may be
configured in a substantial helical shape. The wire-like elements may be
formed from an elastic or super-elastic material, and expand radially
outward when a restraint mechanism is removed following implantation of
the lead.
