Acetabular cup body prosthesis

Details Acetabular cup body prosthesis Acetabular cup body prosthesis

A - Human Necessities

61

F

A61F 2/34 (2006.01) A61B 17/16 (2006.01) A61F 2/00 (2006.01) A61F 2/30 (2006.01)

Patent

CA 2237063

An acetabular cup prosthesis (86) has a cup body with correspondingly shaped inner concave and outer convex (87) surfaces. The cup body has an apex (98) as well as a base (91) that defines a plane (92). The cup body outer convex surface (87) has a portion (89) between the rim (103) and a distance about one third of the distance from the rim (103) to the apex (98), which portion (89) has an outer surface formed by first generating an arc (106) between the rim (103) and a transition point (90) about one third of the distance from the rim (103) to the apex (98), arc having a radius of curvature (101) whose origin (102) is near to, but not coincident with the center of the base (91), and then rotating the arc 360 degrees about a central axis (99) of the cup body, which axis runs between the apex (98) and the center of the base. In another embodiment, a plurality of cup bodies (86) are provided in a range of sizes between about 40 mm and 80 mm. Each cup body (86) has a companion rotary reamer (111) that is correspondingly shaped. The companion cup body (86) is oversized between about 1 mm and 3 mm relative to the companion rotary reamer (111), so that a generally constant change in volume is provided for all cup sizes between 40 mm and 80 mm.

Prothèse de cupule acétabulaire (86) comprenant une cupule présentant des surfaces intérieure concave et extérieure convexe (87) de forme correspondante. La cupule présente un sommet (98) ainsi qu'une base (91) définissant un plan (92). La surface convexe extérieure de la cupule (87) présente une portion (89) comprise entre le bord (103) et environ un tiers de la distance entre le bord (103) et la pointe (98), cette portion (89) présentant une surface extérieure qu'on obtient en générant d'abord un arc (106) entre le bord (103) et un point de transition (90) à environ un tiers de la distance entre le bord (103 ) et la pointe (98), cet arc présentant un rayon de courbure (101) dont l'origine (102) est proche du centre de la base (91), sans coïncider avec ce dernier, puis en opérant une rotation de l'arc de 360 degrés autour d'un axe central (99) de la cupule, cet axe s'étendant entre la pointe (98) et le centre de la base. Selon un autre mode de réalisation, une pluralité de cupules (86) sont prévues dans une gamme de dimensions allant de 40 mm à 80 mm environ. Chaque cupule (86) est assortie d'un alésoir rotatif (111) de forme correspondante. La cupule correspondante (86) est surdimensionnée d'1 à 3 mm environ par rapport à l'alésoir rotatif (111), ce qui donne un changement de volume généralement constant pour toutes les dimensions de cupule entre 40 mm et 80 mm.

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