Patent ID: 7697989

Claim:
An implantable medical device comprising: a casing containing electronic circuitry and having a mounting surface and at least one electrical terminal connected to the electronic circuitry and projecting out of the mounting surface; and an electrically non-conductive header mounted on the mounting surface of the casing having a header bore with a longitudinal axis and extending between a bore entrance and an inner terminal end for receiving a proximal terminal pin of the medical electrical lead, the electrically non-conductive header comprising: an electrically conductive collet spring within the header generally aligned with the longitudinal axis and including an annular base, the collet spring being electrically in contact with the at least one electrical terminal of the medical stimulating device and lying in a plane transverse of the longitudinal axis and a plurality of circumferentially spaced cantilevered arms integral with the annular base and extending away from the annular base in a direction away from the bore entrance and generally parallel to the longitudinal axis, the plurality of arms terminating at tip members, respectively, which are at a uniform radial distance from the longitudinal axis which is less than a radial distance between the annular base and the longitudinal axis; an electrically conductive housing overlying and mechanically and electrically engaged with the collet spring, the housing having an annular groove lying in a plane transverse of the longitudinal axis for engageably receiving the at least one electrical terminal of the medical stimulating device; and a non-conductive end cap including an annular mounting flange and having a receptive cavity; wherein the housing extends between a proximal annular mounting flange generally coextensive with the tip members of the collet spring and a distal annular mounting flange generally coextensive with the annular base of the collet spring; wherein the end cap is fittingly attached to the proximal mounting flange at the receptive cavity; and wherein the header is molded in place on the mounting surface of the casing and encapsulates the collet spring and the housing.