Patent ID: 6931285

Claim:
A medical electrical lead, comprising: a lead body having a lead body lumen; an electrode head assembly having an inner wall forming an electrode head assembly lumen adjacent to the lead body lumen; a drive shaft extending through the lead body lumen and the electrode head assembly lumen; and a sealing member including an outer diameter corresponding to the inner wall of the electrode head assembly, a first end, a second end, an inner lumen extending from the first end to the second end and receiving the drive shaft, a first inner sealing ring positioned in proximity to the first end and a second inner sealing ring positioned in proximity to the second end; wherein the first sealing ring and the second sealing ring engage the drive shaft in a low friction seal, and wherein the sealing member further includes a first outer sealing ring and a second outer sealing ring, the first sealing ring and the second sealing ring forming a high friction seal with the inner wall of the electrode head assembly.