A medical device for determining the position of intracorporeal implants such as fixation systems, plates or the like, comprises at least one impedance-measuring device and an ultrasound device which are both connected to at least one intracorporeal probe, the impedance-measuring device being additionally equipped with at least one connector for connection to the implant. The device is suitable for determining the position of pedicle screws and the like in a spinal column fixation system with metal rods as stabilizers.
