Connecting sleeve for anchoring shafts of two oppositely arranged prostheses

Abstract

The invention relates to a connecting sleeve for anchoring shafts of two oppositely arranged prostheses, preferably on an elongate bone such as a femur or humerus. The reinforcing sleeve comprises tworeceiving bushes (1, 2) for one prosthesis shaft each and comprises a separable coupling region (3) arranged therebetween for connection in such a manner as to resist shear forces and rotation. According to the invention, each receiving bush (1, 2) has, on the side thereof facing the coupling region, one fork (31, 32) of a pair of forks that interact with each other, and a fitting block (4) is arranged on a base of the fork, the lateral surfaces (44) of which fitting block have a distance that corresponds to an inner width of the fork, and the lateral surfaces (44) are designed to contact flanks of the fork in a planar manner, at least one fastening screw (5) being arranged transversely through the fork. The fork connection is simpler to produce than the known wedge connection and yet issufficiently robust. Unlike in the case of the wedge connection, an exact fit is not required; a clearance fit between the fork (31, 32) and the fitting block (4) is sufficient in principle, excessiveplay being eliminated by means of the fastening screw (5).

Description

technical field [0001] The invention relates to a connecting sleeve for anchor rods of two oppositely arranged prostheses, preferably on an elongated bone, such as a femur. The reinforcement sleeve comprises two receiving bushings for the prosthesis rod in each case and a detachable coupling region arranged between these receiving bushings for a push-pull and torsion-proof connection. Background technique [0002] Especially elongated bones tend to have articulations at both ends. This is especially true for large, slender limb bones such as the femur or humerus. Due to disease or wear and tear, artificial joints (Gelenkendoprothese) may be implanted at one or both ends. In some cases, this occurs first at one end of the bone and at the other end at the same time, at a later time, or not at all. [0003] In some cases, the elongated bone becomes too weak due to disease, especially a bone defect, to bear endo-articular prostheses at its ends. Furthermore, it has been show...

AI Technical Summary

Problems solved by technology

In contrast, however, there is the disadvantage that a high manufacturing precision is required for such wedge connectors in order to achieve the desired high fastening reliability.

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