An implantable medical device comprising a sealed flat housing enclosing an electronic circuitry； a plurality of feedthrough conductors, each feedthrough conductor comprising a proximal end part connected to the enclosed electronic circuitry and a distal end part extending from a side surface of the housing and cumulated on said side surface； a tubing that houses a plurality of wires connected to said feedthrough conductors and that is arranged on the housing； and a longitudinal slit through the wall of the tubing through which the wires extend out of the tubing.
