US Patent 7853328 Chip level biostable interconnect for implantable medical devices

A lead is connected to an integrated circuit in an implantable medical device in a lead bonding area that includes a lead-receiving recessed region. At least a portion of a lead conductor is bonded in the lead-receiving recessed region, making an electrical and mechanical connection to the integrated circuit that is strong and potentially biostable. In some embodiments, a filler material is provided around the recessed portion of the integrated circuit that receives the lead conductor, and a metal coating is provided around an outer surface of the filler material for additional mechanical stability.