An implant (1) for mounting a connection pin (17) of a medical device shows a longitudinal axis (9), a distal end (3) and a proximal end (4), from which extends a mounting recess (10) for the connection pin (17) in the direction of the longitudinal axis (9) into the inside of the implant (1). The outer generated surface of the implant (1) can be connected in a non-positive or positive manner with the inner generated surface of a mounting hole in a bone of a human or animal body. The connection pin (17), which is adapted to the mounting recess (10), can be connected in a non-positive or positive manner with the inner generated surface of the mounting recess (10). In order to enable rapid creation and similarly rapid breaking of the connection between the medical device and the implant (1), it is proposed that the inner generated surface of the mounting recess (10) should be provided with at least one depression extending perpendicular to the longitudinal axis (9) of the implant (1) and constituting an undercut, with which an outwardly protruding projection (20a) of an elastic clip device (20) of the connection pin (17) can be radially engaged.