Patent ID: 7112203

Claim:
Apparatus for the preparation of a femur bone for the cement-free implantation of a prosthesis having a press-fit-effect, the prosthesis having a distal part corresponding to a diaphysial region of the femur, a proximal part corresponding to a metaphysial region of the femur and an intermediate region in which the press-fit-effect is provided and which corresponds to a metaphysial-diaphysial region, with the height of the prosthesis being variable depending on the morpho-type and degree of bone damage, the apparatus comprising a rasp of modular design including a plurality of parts, at least one of which has a conical distal rasp part of a single size and of a single shape, there being at least first and second proximal rasp parts of substantially different basic shapes, each of said first and second proximal rasp parts being provided in a plurality of increasing heights, there being releasable connection means at said distal rasp part for connecting both of the proximal rasp parts, one of which being selected in dependence on the morpho-type and on the degree of recessing of the distal rasp part, to said at least one distal rasp part, and also a neutral intermediate element forming a proximal gauge, said neutral intermediate element also being connectable on said distal part of the rasp for driving it and for measuring its degree of recessing on a graduated scale which is adapted to the plurality of increasing heights of the proximal rasp parts and which establishes both the correct length of the prosthesis to be inserted and the size of the required proximal part of the rasp necessary for the preparation of the femur bone to receive the prosthesis to be inserted.