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Screw unit with a closing screw having a screw head for the aseptic closing of an internal thread of a member and an introduction post in firm, but detachable connection on the closing screw. The detachable connection is formed by a tongue in an end of the post being received in a slot in the screw

Screw unit with a closing screw having a screw head for the aseptic closing of an internal thread of a member and an introduction post in firm, but detachable connection on the closing screw. The detachable connection is formed by a tongue in an end of the post being received in a slot in the screw head which slot terminates inward of a peripheral edge of the screw head.

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In a screw unit with a closing screw with a screw head for the aseptic closing of an internal thread in a member to be implanted in a bone material, the improvement comprising an elongated introduction post with a longitudinal axis having one end forming a firm, detachable connection with the closin

In a screw unit with a closing screw with a screw head for the aseptic closing of an internal thread in a member to be implanted in a bone material, the improvement comprising an elongated introduction post with a longitudinal axis having one end forming a firm, detachable connection with the closing screw, said detachable connection providing a positive contact between the post and the closing screw in the rotation direction and a frictional contact therewith in the axial direction, said detachable connection being formed by the screw head having an elongated screw slot, which terminates inward of a peripheral edge of the screw head, and the introduction post being provided with at least one tongue at said one end, said tongue having an elongated cross section with at least one outward bulge having pressing edges and a trapezoidal shape in a section along a longitudinal extension of the tongue, said tongue with the bulge resting under clamping action in the screw slot, when the introduction post and the closing screw are assembled.