The invention relates to an implantable actuating mechanism (1) which is switchable between two stable positions for an implant that is switchable between states or positions comprising a supporting element (2) which has a mounting plate (3) for supporting itself against a bone and a spring loaded actuation element that can be moved relative to the supporting element wherein said actuation element extends through the supporting element and is connected by means of a cable (51) to an actuating part (40) initiating a switch between the two positions of the implant and provided on the other side of the supporting element. According to the invention the spring loaded actuation element has a guide ring (104) comprising more than one projection (108) wherein the projections are guided in a guide link (106) in such a way that they can be engaged under spring loading into two locking positions defining the above mentioned implant positions.
