Patent ID: 8831742

Claim:
A lead assembly for an electrical stimulation system, the lead assembly comprising: a lead body having a distal end, a proximal end, a longitudinal length, and a circumference; a multi-lumen conductor guide disposed along at least a portion of the longitudinal length of the lead body, the multi-lumen conductor guide having and outer surface and defining a central lumen and a plurality of conductor lumens disposed around the central lumen, wherein at least a portion of the multi-lumen conductor guide is twisted and forms at least one helical section with the plurality of conductor lumens forming helical pathways around the central lumen, and wherein the plurality of conductor lumens are encapsulated by the multi-lumen conductor guide such that the plurality of conductor lumens do not extend to the outer surface of the multi-lumen conductor guide; a plurality of electrodes disposed along the distal end of the lead body, the plurality of electrodes comprising a plurality of segmented electrodes, wherein each of the plurality of segmented electrodes extends partially around the circumference of the lead body; a plurality of terminals disposed along the proximal end of the lead body; a plurality of conductors electrically coupling at least one of the plurality of electrodes to at least one of the plurality of lead terminals; at least one distal marker formed as a strip extending along the distal end of the lead body, the distal marker identifying the circumferential position of at least one of the plurality of segmented electrodes along the lead body, wherein the distal marker is aligned with the at least one of the plurality of segmented electrodes along the longitudinal length of the lead body; and at least one proximal marker formed as a strip extending along the proximal end of the lead body, wherein the proximal marker is aligned with the distal marker along the longitudinal length of the lead body, and wherein the at least one proximal marker is disposed distal to at least one terminal of the plurality of terminals; wherein the at least one distal marker and the at least one proximal marker are discontinuous with one another along the lead body.