Importance

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Abstract

A positioning means for stabilizing segments of the spinal column or dummies between two such segments has a simple design and allows a certain alignment of the connecting rods to be connected thereto. To this end a positioning screw (1) is provided which comprises a threaded shaft part (2) and a receiver part (3) for a rod (5) provided at the head side. The rod and the receiver part are rigidly connectable with each other by means of two nuts (6, 7; 18, 19; 20, 21). The respective part of the receiver part (3) forming the abutment for the nuts (6, 7) or for the intermediate members (6',7'; 16, 17) is formed as a spherical or cylindrical segment. The part which has to be brought in engagement with this segment comprises an inner surface which is formed as a hollow sphere or a hollow cylinder and which is concentric to the central axis of the nut or the intermediate piece, resp.

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First Claim