Abstract: An instrument for lithotripsy having a probe which can be vibrated longitnally by means of a drive and which extends through a guide channel in the shaft of an endoscope and is supported and guided externally of the shaft by a guide element aligned on the corresponding guide channel, is described. The guide element receives the housing of the probe drive also serving as a handle proximally, and its distal end can be releasably attached to a rinsing and probing attachment which can be connected to the proximal end of the endoscope and is provided with valves. The guide element is designed so that the valves can be actuated unimpeded.