Bone screw, in particular for osteosynthesis

Details Bone screw, in particular for osteosynthesis Bone screw, in particular for osteosynthesis

A - Human Necessities

61

B

A61B 17/86 (2006.01)

Patent

CA 2688402

According to the invention, this screw (1 ) includes: - a threaded proximal portion (2), the core (11 ) and thread (12) of which have a constant diameter; - a threaded median portion (3), the core (15) of which is conical, having a diameter becoming increasingly larger from the distal end of this threaded median portion (3) to the proximal end of this threaded median portion (3), and the thread (16) of which has a constant diameter, smaller than the diameter of the thread (12) of the proximal threaded portion (2); the pitch of the thread (16) of this threaded median portion (3) becomes increasingly smaller from said distal end towards said proximal end, and, at the proximal end of this threaded median portion (3), this pitch is larger than the pitch of the thread (12) of the proximal threaded portion (2); - a threaded distal portion (4), the core (17) and the thread (18) of which have a constant diameter and the thread (18) of which has a diameter smaller than the diameter of the thread (16), the pitch of the thread (18) of this threaded distal portion (4) being larger than the pitch of the thread (16) at the distal end of this threaded median portion (3).

Selon l'invention, cette vis (1) comprend : - une partie proximale filetée (2), dont le cAEur (11) et le filetage (12) ont un diamètre constant ; - une partie médiane filetée (3), dont le cAEur (15) est conique, ayant un diamètre devenant progressivement plus important de l'extrémité distale de cette partie médiane filetée (3) à l'extrémité proximale de cette partie médiane filetée (3), et dont le filetage (16) a un diamètre constant, inférieur au diamètre du filetage (12) de la partie filetée de la partie filetée proximale (2) ; le pas du filetage (16) de cette partie médiane filetée (3) devient progressivement inférieur de ladite extrémité distale à ladite extrémité proximale, et, à l'extrémité proximale de cette partie médiane filetée (3), ce pas est supérieur au pas du filetage (12) de la partie filetée proximale (2) ; - une partie distale filetée (4), dont le cAEur (17) et le filetage (18) ont un diamètre constant et dont le filetage (18) a un diamètre inférieur au diamètre du filetage (16), le pas du filetage (18) de cette partie distale filetée (4) étant supérieur au pas du filetage (16) au niveau de l'extrémité distale de cette partie médiane filetée (3).

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