Patent ID: 7588602
Filing Date: 2009-09-15
Classification: A61F

Abstract:
1. Hip prosthesis structure ( 1 ) comprising in combination a stem ( 2 ) to be inserted into the upper portion of the femur, and a shaped bar or neck, said stem ( 2 ) having in its top a cavity ( 3 ) in which is disposed a free end ( 4 e ) of said shaped bar or neck ( 4 ), said shaped bar or neck carrying on another end ( 4 d ) a spherical head to be joined to the acetabulum of the hip, characterized in that said free end ( 4 e ) of said neck ( 4 ) is shaped in the form of two half truncated cones ( 5 and 6 ) having conical axes (L-L, M-M) transversely spaced from each other on opposite sides of a longitudinally extending plane (γ) and positioned so that said cones are mirror images of each other; and each truncated cone being delimited transversely by two bases ( 7 and 7 ′) which are essentially flat and parallel, the half truncated cones being linked to each other by two transversely oriented surfaces ( 8 and 9 ) which form two recesses ( 10 and 11 ) inside planes (β) and (β′) tangent to said two half truncated cones ( 5 and 6 ), the shape of said cavity ( 3 ) being complementary to said free end of said shaped bar or neck formed by said two half truncated cones ( 5 and 6 ) and by said planes (β) and (β′) tangent to said cones.