An implantable device including an implantable first module having an elongate carrier member connected to a first housing； a stimulation unit disposed in the first housing and configured to utilize electrical signals received from a second module, and an electrically conductive first lead including at least one electrical conductor extending from the first housing at a proximal end of the first lead to a distal end of the first lead and an electrical insulator covering the at least one conductor at the proximal and distal ends of the first lead, wherein the first lead is configured to provide the signals from the second module to the stimulation unit when the first lead is electrically connected to the second module.
