Patent ID: 6811569
Filing Date: 2004-11-02
Classification: A61F

Abstract:
An expansible acetabular prosthesis comprising:a hollow metal artificial acetabular cup having expansion slots distributed over its periphery; a metal intermediate cup-shaped element with an inner surface of spherical cap shape, a hollow polyethelene insert with outer and inner surfaces of spherical cap shape fitting in said metal intermediate element; wherein said metal acetabular cup and said metal intermediate element comprise screwing means for bringing an outer surface of said metal intermediate element into congruent contact, by screwing, against at least one internal meridian generatrix of each segment delimited by two consecutive said slots, wherein said screwing means comprise a peripheral threading formed on the inner surface of said metal acetabular cup near its opening, in which threading said metal intermediate element is screwed with the aid of a complementary threading on its outer surface near its opening, wherein an internal diameter (d2) of the opening of said metal acetabular cup in a standby position before screwing said intermediate element therein is smaller than an external diameter (D3) of said metal intermediate element, and wherein said metal acetabular cup is equipped with bone-anchoring teeth on its outer face.