An implantable medical lead body has a proximal end and a distal end. The lead body includes an inner tubing defining a lumen and formed of one or more non-conductive materials, a plurality of coiled conductors wound around the inner tubing, and an outer jacket extending over the plurality of coiled conductors. The inner tubing of the lead body may be design with a reduced coefficient of friction. For example, an inner surface of the inner tubing may have a lower coefficient of friction than an outer surface of the inner tubing. In another example, the inner tubing may be formed of a polymer having a surface modified to provide a reduced coefficient of friction.
