Bone screw

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/86 (2006.01) A61B 17/74 (2006.01)

Patent

CA 2511839

The invention relates to a bone screw (1) comprising a longitudinal axis (2) and a thread shank (15), a thread (3) provided with an outer diameter DA, a frontal thread end (4) and a thread profile (11). The thread profile (11) comprises a frontal thread flank (7) which is directed towards the frontal thread end (4), a rear thread flank (18) and a flank angle , whereby A) the thread (3) is a multipath, preferably double path thread; and B) each thread path of the thread (3) comprises a blade-type element (5) with a cutting edge (6) on the frontal thread end (4).

L'invention concerne une vis d'ostéosynthèse (1) comportant un axe longitudinal (2) et une tige filetée (15) qui présente un filetage (3) possédant un diamètre extérieur D<SB>A</SB>, une extrémité de filetage antérieure (4) et un profil fileté (11). Ce dernier (11) présente un flanc fileté (7) antérieur, dirigé vers l'extrémité filetée antérieure (4), un flanc fileté postérieur (18) et un angle de flanc .beta.. Selon l'invention, A) le filetage (3) se présente sous la forme d'un filetage à pas multiples, de préférence à deux pas; et B) chaque pas du filetage (3) présente, à l'extrémité de filetage antérieure (4), un élément de type lame (5) présentant une arête tranchante (6).

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