Patent ID: 8688236

Claim:
A medical electrical lead, comprising: a lead body having a proximal section and a distal section; an electrode coupled to the distal section of the lead body; at least one helically coiled electrical conductor disposed within an interior lumen of the lead body and electrically coupled to the electrode, the at least one helically coiled electrical conductor including a plurality of turns disposed about a longitudinal axis of the lead body and extending from the proximal section to the distal section of the lead body; at least one helically coiled spacer element electrically isolated from the electrode, the at least one helically coiled spacer element including a plurality of turns interstitially disposed between adjacent turns of the at least one helically coiled electrical conductor to form a coil assembly comprising the at least one helically coiled electrical conductor and the at least one helically coiled spacer element; and wherein the at least one helically coiled electrical conductor and the at least one helically coiled spacer element are wound together to have a first portion of the coil assembly that is close-wound and a second portion of the coil assembly that is open-wound.