Patent ID: 8335570

Claim:
An implantable lead having a distal end and a proximal end and comprising: an inner core with a proximal end, a distal end, and a longitudinal length, the inner core defining a plurality of lumens; a plurality of electrodes disposed on the distal end of the lead; a plurality of terminals disposed on the proximal end of the lead; a plurality of coiled conductor guides, each coiled conductor guide having a first end and a second end, each coiled conductor guide defining a plurality of helical lumens, each coiled conductor guide disposed in a coiled arrangement over a portion of the inner core; and a plurality of conductors, each conductor electrically coupling at least one of the electrodes to at least one of the terminals, wherein at least one of the conductors is a first conductor that comprises a plurality emits, each unit comprising a first conductor segment of the first conductor extending along the inner core from a beginning point to a first position, a coiled conductor segment of the first conductor disposed at least partially in one of the lumens of the coiled conductor guides and extending from the first position to a second position, and a second conductor segment of the first conductor extending along the inner core from the second position to an endpoint, wherein the first position is between the second position and the endpoint, and the second position is between the beginning point and the first position; wherein the diameters of the lumens extending along the inner core are larger than the diameter of the lumens of the coiled conductor guides.