Cantilevered spring contact for an implantable medical device

A system, comprising:

• a hermetically sealed implantable medical device;
• a header coupled to the hermetically sealed medical device;
• a housing, coupled to the header, inside the header, the housing tubular in shape, defining a housing passage extending along a longitudinal axis, from a proximal portion including a proximal lip that defines a proximal opening, to a distal portion including a distal lip that defines a distal opening, the housing including an inner surface;
• and
• an electrical contact spring disposed in the housing, the electrical contact spring tubular in shape and defining an electrical contact spring passage concentric to the housing passage, the electrical contact spring comprising:
• a distal ring portion disposed adjacent the distal portion of the housing and physically coupled to the housing;
• a proximal ring portion disposed near the proximal portion of the housing, the proximal ring portion suspended inside of and spaced apart from at least some of the inner surface of the housing, and a plurality of electrical contact spring elements coupled to and extending from the distal ring portion to the proximal ring portion, wherein the plurality of electrical contact spring elements are adapted to flex to move transversely with respect to the longitudinal axis, to move the proximal ring portion with respect to the housing;
• and
• an electrical lead disposed in the electrical contact spring passage, with at least some of the plurality of electrical contact spring elements deformed around the electrical lead, contacting an electrical contact of the electrical lead.