Acetabular ring prosthesis with reinforcement buttress

Details Acetabular ring prosthesis with reinforcement buttress Acetabular ring prosthesis with reinforcement buttress

A - Human Necessities

61

F

A61F 2/34 (2006.01)

Patent

CA 2267246

A cemented acetabular prosthesis (10) includes a cup body (10A) having a relative thin wall (for example, 2 mm). The body (10A) has a concave surface (12B), a convex surface (12A), and an annular rim (13). A plastic liner (11) registers into a concavity (12B) of the cup body (10A), the liner (11) having a wall with a liner wall thickness much greater than the cup body wall thickness and a concave surface and a convex surface that registers and fits the concave surface (12B) of the cup body (10A). The cup body wall provides a plurality of openings (26, 27, 29, 30). Some of the openings are bone screw (B) receptive openings (27) that are reinforced with an annular reinforcement (28) that extends away from the convex surface (12A) of the cup body (10A). Other openings are unreinforced openings (30) that allow cement (C) to flow from the concave (12B) to the convex (12A) side of the cup body (10A) and into the patient's acetabulum during surgery. The cup body (10A) has a peripheral buttress portion (22) for supporting a volume of cement (C) of the cement mantle at a peripheral interface position between the liner (11) and the body (10A).

La présente invention concerne une prothèse acétabulaire (10) collée comportant une coupelle (10A) à paroi relativement fine (2 mm par exemple). La coupelle (10A) présente une face concave (12B), une face convexe (12B) et un bord annulaire (13). Une garniture en plastique (11) s'adapte dans une concavité (12B) de la coupelle (10A), la garniture (11) formant une paroi dont l'épaisseur est bien supérieure à l'épaisseur de la paroi de la coupelle et définissant une face convexe qui s'adapte sur la face concave (12B) de la coupelle (10A). La paroi de la coupelle présente une pluralité d'orifices (26, 27, 29, 30). Certains de ces orifices sont des passages (27) de vis à os (B) renforcés par un renfort annulaire (28) s'éloignant de la face convexe (12A) de la coupelle (10A). D'autres orifices sont des orifices non renforcés (30) qui laissent passer la colle (C) de la face concave (12B) vers la face convexe (12A) de la coupelle (10A) puis dans l'acétabule du patient pendant l'intervention chirurgicale. Le pourtour de la coupelle (10A) comporte un renfort (22) permettant de retenir un volume de colle (C) du manteau de colle au niveau de la zone périphérique en interface entre la garniture (11) et la coupelle (10A).

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