Fastening element

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/58 (2006.01) A61B 17/78 (2006.01) A61B 17/86 (2006.01) A61C 8/00 (2006.01) F16B 25/10 (2006.01) F16B 33/02 (2006.01) F16B 39/30 (2006.01)

Patent

CA 2088102

The fastener, which is especially adapted for bones, consists of a shaft (2) bearing a thread (1) with variable pitch, a front end (3) and a rear end (4). The thread (1) is present over the entire area of the shaft (2), and in the area of the rear end (4) is characterized by a smaller pitch than in the area of the front end (3). Thanks to the diminishing pitch of the thread (1) in the proximal direction, a locally differentiated intraosseous pressure generation takes place. In accord with the well-known Wolff's Law, this leads to a controlled bone growth along the loading axis and thus an improvement in the stability of the implanted fastener.

Fixation, spécialement adaptée pour les os, constituée d'une tige (2) présentant un filetage (1) à pas variable, une extrémité avant (3) et une extrémité arrière (4). Le filetage (1) est présent sur toute la surface de la tige (2), ainsi que dans la zone de l'extrémité arrière (4) où son pas est plus petit que dans la zone de l'extrémité avant (3). Grâce à cette progression descendante du pas du filetage (1) en direction proximale, une pression intra-osseuse différenciée localement est exercée. Conformément à la loi de Wolff bien connue, cela entraîne une croissance contrôlée de l'os le long de l'axe de chargement et, par conséquent, une amélioration de la stabilité de la fixation implantée.

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