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OwnerFrancois Badatcheff, Jean-Pierre Besse +5inventors
InventorsFrancois Badatcheff, Jean-Pierre Besse, Jean-Claude Moretton, Patrice Rochereau, Peter Thumler, Dominique Poitout, Nathalie Laurent-Renaud
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The invention relates to a femoral prosthesis part, the metaphyseal part of which comprises a series of geometric sections (SA to SG) which are disposed in parallel to the transverse plane at equidistant levels. The aforementioned geometric sections are provided with a quadrilateral shape having strongly rounded summits. The two long sides of said sections converge in the medial direction and each section lies inside a geometric quadrangle which is located in the plane. The four sides of said quadrangle intercept, respectively, four geometric lines (m, l, a, p) which are obtained by projecting the profiles of the internal surface of the cortical bone. The above-mentioned geometric sections pivot in relation to one another in internal rotation from the bottom upwards in order to obtain the desired helitorsion angle.
1-16. (canceled)
A prosthesis femoral part of the type comprising a prosthesis shank, a prosthesis metaphyseal portion for forming a bearing zone in the metaphysis of the femur, and a head having a suitable anteversion angle, said metaphyseal portion being shaped to present helitorsion, wherein the metaphyseal portion presents a succession of geometrical sections at equidistant levels parallel to a plane that is transverse relative to the general direction of the prosthesis, which sections are in the form of quadrilaterals with greatly rounded corners with two major sides that converge in the medial direction, each section being inscribed in, and tangential on all four sides to, a geometrical quadrilateral situated in the plane of said section at the level in question, which quadrilateral intercepts via its four sides the four respective geometrical lines obtained by projecting on two inclined planes the profiles of the inside surface of the bone cortex of the femur, said sections being turned relative to one another in an inwardly-turning angular direction on passing upwards from one equidistant plane to a consecutive equidistant plane, said turns together leading to the desired helitorsion angle.
Dependencies are inferred from the claim text.