Screw socket for an artificial hip joint

Details Screw socket for an artificial hip joint Screw socket for an artificial hip joint

A - Human Necessities

61

F

A61F 2/32 (2006.01) A61F 2/34 (2006.01) A61F 2/00 (2006.01) A61F 2/30 (2006.01)

Patent

CA 2241405

The invention concerns a screw socket for an artificial hip joint, with a self-cutting V-shaped, buttress, trapezoidal or round thread on a thread base of a screw socket body. In order to facilitate screwing into hard bone material, each thread segment is formed, in the front region in the direction of rotation, with a cutting edge with a clearance face so that, in the section in a plane which is located in the front region with parallel displacement relative to a plane tangential to the thread base (18), the said cutting edge has a clearance angle .alpha.. Preferably, the cutting edge also has a cutting rake .gamma. in the said section.

L'invention porte sur une douille à vis pour une articulation artificielle de la hanche. L'articulation comprend un contrefort autocoupant en forme de V et un filet trapézoïdal ou rond sur une base de filetage d'un corps de douille à vis. Afin de faciliter le vissage dans un os dur, chaque segment du filet est formé dans la région avant, dans le sens de rotation, et comporte un bord tranchant présentant une face de dépouille. Ainsi, le bord tranchant susmentionné a un angle de dépouille .alpha. dans une section se trouvant dans un plan de la région avant et présentant un déplacement parallèle relativement à un plan tangentiel à la base de filetage (18). De préférence, il comprend également une inclinaison de coupe .gamma. dans la section susmentionnée.

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