Abstract: For a surgical instrument for removing distal and/or peripheral cement (2) and/or a medullary block in a medullary cavity (8) when endoprostheses are replaced, the surgical instrument comprising a drilling tool (4) and an extraction tool (6), it is provided that the drilling tool (4) and the extraction tool (6) comprise a bore (14,16) extending coaxially to the respective tool shaft (12) for receiving a centering bolt (10), that the bore diameter of the coaxial bores (14,16) of the drilling tool (4) and the extraction tool (6) is substantially adapted to the diameter of the centering bolt (10), and that the centering bolt (10) anchored at a predetermined location in the cement (2) or the medullary block and the medullary space (5) located distally below it is configured as an axial guide for the drilling tool (4) and the extraction tool (6), respectively.

Abstract: A device for driving a wire pin, and in particular a Kirschner wire, into bone material, comprising a propelling device that acts upon the wire pin which may be inserted into the device from the free front end thereof, said propelling device being driven by periodically repeated impact strokes applied thereupon by an impacting member. The propelling device acts upon the wire pin without any clamping means being involved, which is achieved by the propelling device being designed as a transmitting member against which the free end face of the wire pin may evenly abut and which may transmit the impact strokes of the impacting member as impact pulses into the wire pin through the free end face thereof, with the impact pulses propagating through the wire pin as periodic compression waves so that the wire pin is successively driven into the bone material.