Patent ID: 8923985

Claim:
An implantable lead comprising: a flexible body extending between a proximal end and a distal end; and a distal assembly coupled to the distal end of the body and including: a housing having a distal end and a proximal end, the proximal end fixedly coupled to the distal end of the lead body; a coupler rotatably disposed within the housing, the coupler having a proximal end and a distal end; and a helical electrode fixedly secured to the distal end of the coupler, the helical electrode comprising: a proximal axial length portion that comprises a non-degradable material; a distal axial length portion that comprises a biodegradable material; wherein the coupler and the helical electrode are configured to translate relative to the housing between fully extended and fully retracted positions; and an interface between a distal end of the proximal axial length portion that comprises a convex surface and a proximal end of the distal axial length portion that comprises a concave surface that is complementary to the convex surface.