Hip joint socket with a special thread

Details Hip joint socket with a special thread Hip joint socket with a special thread

A - Human Necessities

61

F

A61F 2/34 (2006.01) A61F 2/00 (2006.01) A61F 2/30 (2006.01)

Patent

CA 2252510

The invention concerns a screw-in type artificial hip joint socket with a special thread for implantation in human beings. Hip joint sockets of this type usually have a flat thread with parallel teeth flanks or a triangular thread with a neutral teeth position, the axial pitch being conventionally constant. However, such embodiments are unfavourable because they do not take sufficiently into account the forces which arise during implantation as well as during the intended use, or they cause an unnecessarily extensive bone bad destruction during an eventually required explantation. With the invention a purposefully optimization of the hip joint socket thread is provided, wherein the thread profile, the angular orientation of the thread teeth and a non-linear thread pitch is utilized, in order to ensure an effortless screwing, a stable seat in the long term and an unproblematic explantation.

L'invention concerne une cavité glénoïde artificielle vissable de l'articulation de la hanche (16) pourvue d'un filet spécial (22-26) et destinée à être implantée chez un être humain. Les cavités glénoïdes de ce type sont normalement pourvues d'un filet rectangulaire à dents à flancs parallèles ou d'un filet triangulaire à dents ayant une position neutre, le pas axial étant généralement constant. Ces modes de réalisation sont toutefois défavorables car ils ne tiennent pas suffisamment compte des forces qui s'exercent aussi bien pendant l'implantation que pendant l'utilisation, ou provoquent une destruction inutilement étendue du lit osseux au cas où l'implant devrait être extrait. L'invention optimise le filet (22-26) de la cavité glénoïde vissable, mettant en oeuvre le profil du filet, la position angulaire des dents du filet (22-26) et un pas non linéaire pour assurer un vissage sans effort, une assise stable à long terme et une extraction sans problèmes.

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