The medical appts. has a patient table which is adjustable in three-dimensions, in a shock wave generator for destruction of the internal stones and an X-ray device for locating the stones to be treated. The scanned area is displayed on an X-ray monitor with the boundaries of the treatment zone of the shock wave generator, dependent on the actual position of the patient table relative to the shock wave generator, displayed on the screen to overlie the X-ray image. The adjustment drive for the treatment table is pref. coupled to a processor which evaluates its actual position relative to the shock wave generator to calculate the boundaries of the treatment zone.
