Bone screw
AssigneeAesculap AG
InventorsJoachim Muhling, Theodor Lutze, Hans Pistner, Achim Hurst
Life of this patent
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Abstract
In order to reduce the risk that a bone screw, in particular one made of resorbing plastic material, with an externally threaded shaft will be destroyed by high screw-in torques, it is proposed that an insertion channel open at the top, arranged concentrically with the shaft and extending along most of the length of the shaft be located in the shaft for an insertion tool and have a cross-section which is non-circular and corresponds to the cross-section of the screwing-in tool.
Claims15
A bone screw made of resorbing plastic material, comprising an externally threaded shaft in which a tool insertion channel open at the top, arranged concentrically with said shaft and extending along most of the length of said shaft is located, the cross-section of said insertion channel being non-circular and corresponding to the cross-section of a tool used for screwing-in said screw, characterized by a closure pin made of resorbing material insertable in said insertion channel, thereby filing it out completely, the dimensions of the cross-section of said closure pin being such that it does not expand said screw, whereby the diameter of said screw is at no time enlarged by the insertion of said closure pin.
A bone screw made of resorbing plastic material, comprising an externally threaded shaft in which a tool insertion channel open at the top, arranged concentrically with said shaft and extending along most of the length of said shaft is located, the cross-section of said insertion channel being on-circular and corresponding to the cross-section of a tool used for screwing-in said screw, characterized by a closure pin made of resorbing material insertable in said insertion channel, thereby filing it out completely, the dimensions of the cross-section of said closure pin being such that it does not expand said screw, wherein said closure pin is fixable in a positively connected manner in said insertion channel by an elastic detent connection.
Dependencies are inferred from the claim text.