Nail and screw fixation system for improving the fixation of...

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/72 (2006.01) A61B 17/80 (2006.01) A61B 17/86 (2006.01)

Patent

CA 2497325

The present invention relates to a nail and screw system (1) for improving the fixation of proximal fractures of the humerus, including at least a Numeral nail (10) to be inserted in a Numeral shaft (9) and comprising at least a proximal transversal hole (5) for the passage of a corresponding locking screw (3), the screw (3) having a screw head (4) and a screw body (31). Advantageously, the nail is cannulated and the transversal hole (5) comprises a couple of opposite holes (6', 6") on opposite wall of the cannulated nail (10); the hole (6) closer to the screw head (4) has an internal partially threaded portion (28) and the corresponding screw (3) has an outside thread diameter smaller than the diameter of said at least one transversal hole (27) that receives such a screw. Said nail is cannulated and said transversal hole comprises a couple of opposite holes (6', 6") on opposite wall of the cannulated nail (10) and the hole (6') closer to the screw head (4) includes said partially threaded portion (28).

La présente invention concerne un système (1) à clou et à vis améliorant la fixation des fractures proximales de l'humérus, comprenant au moins un clou huméral (10) destiné à être inséré dans un arbre huméral (9) et comprenant au moins un trou transversal proximal (5) pour le passage d'une vis de verrouillage correspondante (3), la vis (3) comprenant une tête (4) de vis et un corps (31) de vis. Le clou est avantageusement tubulaire et le trou transversal (5) comprend une paire de trous opposés (6', 6") sur la paroi opposée du clou tubulaire (10). Le trou (6) le plus proche de la tête (4) de la vis présente une partie interne partiellement filetée (28) et la vis correspondante (3) présente un diamètre extérieur fileté plus petit que le diamètre dudit trou transversal (27) recevant la vis. La partie partiellement filetée (28) constitue une partie de vis à écrou mais n'interagit pas avec la vis au cours d'une insertion normale. En cas de mouvement ou de déplacement non désiré de la vis (3) après son serrage final ou en cours d'utilisation, la partie partiellement filetée (28) résout le problème en venant en contact avec la partie filetée de la vis (3) au moins de crête à crête.

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