Patent ID: 8494651

Claim:
A medical lead comprising: a lead body comprising a proximal segment and a distal segment; at least one lumen disposed within the lead body, the lumen configured to receive a guidewire; and a coil conductor disposed within the lead body, the coil conductor comprising: a first coiled segment along the proximal segment of the lead body, the first coiled segment wound from a first number of filars to have a first pitch and a first outer diameter; a second coiled segment along the distal segment of the lead body, the second coiled segment wound from a second number of filars to have a second pitch and a second outer diameter, the second outer diameter smaller than the first outer diameter; and a transition point between the first coiled segment and the second coiled segment, the first coiled segment wound from at least one filar along the length of the first coiled segment to the transition point and the second coiled segment wound from the at least one filar from the transition point along the length of the second coiled segment, wherein the first pitch is less than the second pitch and the proximal segment of the lead body has different flexural characteristics than the distal segment of the lead body based at least in part on the first pitch being less than the second pitch, wherein the at least one filar is coated along the first coiled segment and the at least one filar is uncoated along the second coiled segment after having had coating removed from the at least one filar during the winding of the second coiled segment, and wherein the lumen extends within the first coiled segment, the transition point, and the second coiled segment.