Acetabular implant with threaded liner and locking ring

A - Human Necessities – 61 – F

Patent

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Details

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

Patent

CA 2213921

The acetabular implant of the invention includes a shell having a threaded polarhole with a liner having a threaded polar protrusion extending therefrom for threadable accommodation within the threaded polar hole. Further, the implant includes a locking ring carried by the shell for engagement with the liner. In use, the liner is screwed into the shell by the cooperating threads of the liner and shell. As the liner bottoms out in the shell, the locking ring slides into an annular groove formed in the outer periphery of the shell to lock the liner to the shell. The locking engagement of the locking ring prevents the liner from shifting laterally relative to the shell which therefore prevents the liner from rotating in a direction to loosen the shell relative to the liner. While it is preferred that the liner is formed from a metal, the liner may be formed from either a metal or a plastic dependant upon the clinical requirements for the patient.

Cette invention concerne une prothèse acétabulaire qui comprend une coquille à trou polaire taraudé et une doublure comportant un tige polaire filetée destinée à se visser dans le trou polaire susmentionné. De plus, la prothèse comprend une bague de verrouillage fixée à la coquille et servant à retenir la doublure. La doublure se visse dans la coquille au moyen de la tige filetée. Lorsque la doublure est vissée à fond, la bague de verrouillage susmentionnée glisse dans une rainure annulaire formée dans la face extérieure de la doublure et verrouille celle-ci en place. La bague de verrouillage empêche la doublure de se déplacer latéralement par rapport à la coquille et, par le fait même, de tourner dans le sens de dévissage. Alors qu'il est préférable d'avoir une doublure en métal, celle-ci peut également être en plastique si les considérations cliniques le permettent.

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