US Patent 7184838 Implantable medical lead and method of manufacture

An implantable electrical lead having coiled conductors and a method of manufacturing the lead. The method generally comprises: (a) assembling, along an outer surface of inner elongate structure defining an longitudinal axis, at least one elongate conductor and at least one twist ring holding a first portion of the elongate conductor; (b) fixing a second portion of the elongate conductor to the outer surface of the inner elongate structure, the second portion of the elongate conductor being spaced along the length of the elongate conductor; and (c) rotating the twist ring relative to the longitudinal axis of the inner elongate structure to coil the at least one elongate conductor.