Special cutters for use in implant technology

摘要

The invention relates to rotating and oscillating special cutters for use in implant technology (endoprosthetics), for recesses (cutouts) for the production of permanent anchorage of the components. With the anchorage elements conventionally employed in implant technology (endoprosthetics) there is a problem with regard to permanent stability of the anchorage components. Atrophy and wear of a bone and, in particular, tensile loads frequently lead to premature loosening of the components anchored in the bone. Cutouts are therefore provided in which the cavity has a larger cross-section or diameter at depth than in the entry region of the cavity. In order to produce these recesses the invention provides special cutters in which the cross-section or the diameter in the region of the cutting sections can be increased during the cutting operation, so that recesses as described above are thereby produced. Technically, this problem is solved in that the envelope curve of curved cutter plates is varied, preferably by displacement of adjustable, e.g. bushing-like, elements along the axis of rotation, and in that cutter plates are spread out like fins from guides, preferably by means of a linkage which can be displaced in a defined manner along the axis of rotation, so that as a result the particular cutting cross-section can be increased by exactly adjustable elements. <IMAGE>