Patent ID: 8229569

Claim:
A method of forming a lead body using a) a pre-formed tube comprising a first polymer, the pre-formed tube having a longitudinal axis, a cavity along the longitudinal axis configured for containment of an electrical conductor, and an annular end oriented generally normal to the longitudinal axis, and b) a mold having an inner cylindrical section and an outer tubular section surrounding the inner section and separated there from to form a space defining a tubular positive mold, said method comprising: applying a primer to the end of the pre-formed tube; positioning the end of the pre-formed tube into the space of the mold to thereby align the cavity of the pre-formed tube with the inner cylindrical section of the mold, and to thereby close an end of the tubular positive mold to form a mold cavity; introducing a liquid second polymer into the mold cavity near the end of the pre-formed tube; and curing the liquid second polymer to form a molded tube having a longitudinal axis and an annular end oriented generally normal to the longitudinal axis, wherein the end of the molded tube is joined to the end of the pre-formed tube at a junction.