Machining assembly and methods for preparing the medullary...

A - Human Necessities – 61 – B

Patent

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A61B 17/56 (2006.01) A61B 17/17 (2006.01) A61F 2/34 (2006.01) A61B 17/16 (2006.01)

Patent

CA 2219163

A machining assembly, including a novel broach design, are disclosed for preparing a femoral medullary cavity (C) for receipt of a femoral prosthetic stem (S), wherein the configuration of the implantation site allows for the neutral alignment of the prosthesis (S) within the medullary cavity (C) for improved rigid fixation of the stem (S) therein. Aspects of the inventive machining assembly include a novel broach (10) comprising a proximal lateral recess (13) that allows for initial avoidance of the greater trochanter during implantation, thereby resulting in the preparation of a neutrally aligned cavity with respect to the broach. The machining assembly also includes a guide (200) and second cutting instrument (208) for removing the bone of the greater trochanter (1 ) once neutral alignment between the medullary cavity (C) and broach (10) are achieved for the subsequent implantation of a neutrally aligned femoral prosthesis (S).

Machine-outil, y compris une configuration de broche innovatrice, servant à préparer une cavité médullaire fémorale (C) à recevoir une tige prothétique fémorale (S). La configuration de l'emplacement de l'implantation permet un alignement neutre de la prothèse (S) à l'intérieur de la cavité médullaire (C) et, ainsi, une meilleure fixation rigide de la tige (S). La machine-outil de l'invention comprend une broche innovatrice (10) présentant un logement latéral proximal (13) qui permet d'éviter initialement le grand trochanter au cours de l'implantation. Il est donc possible de préparer une cavité avec alignement neutre par rapport à la broche. La machine-outil comporte également un guide (200) et un second instrument coupant (208) pour enlever l'os du grand trochanter (1) une fois que l'alignement neutre entre la cavité médullaire (C) et la broche (10) est obtenue pour l'implantation d'une prothèse fémorale (S) alignée de façon neutre.

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