US Patent 7983754 Lead insertion visibility

An implantable medical device system that includes a housing containing an electrical circuit and a connector header mounted on the housing. A first inner surface of the connector header forms a connector bore adapted for receiving a lead connector assembly for electrically coupling a medical lead to the circuitry contained in the housing, and one of the connector header and the lead connector includes a visibly modified surface for facilitating visual verification of full insertion of the medical lead connector assembly in the connector bore.