The implantable medical device is configured as a cochlear implant or the like. The implantable medical device includes a stimulator unit, an elongate electrode carrier in electrical communication with said stimulator unit, and an internal receiver unit. The internal receiver unit is configured as a suction cup having first and second convex cup portions. The first convex cup portion is adapted for mounting against a bone surface. Preferably, each of the first and second convex cup portions is formed from a resilient, flexible, biocompatible material. The second convex cup portion has a central bore formed therein. When the second convex cup portion is mated against the first convex cup portion, a threaded screw extends through the bore to contact the first convex cup portion and is tightened, thus compressing the first convex cup portion against the bone surface for suctional adhesion thereto.
