Femoral hip-joint prosthesis with a logarithmically extending curvature
AssigneePlus Endoprothetik AG
InventorHans F. Schmotzer
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Abstract
A femoral hip-joint prosthesis having a tapered stem for implantation by cement. The prosthesis has a collarless shoulder at a proximal end and a stem extending therefrom to a distal end in tapered fashion. A logarithmically extending curvature of anterior and posterior side faces of a first subsidiary section of the stem combine with straight converging lines of a second subsidiary section of the stem to uniformly distribute pressure in the prosthesis within the femoral hip bone.
Claims10
A femoral hip-joint prosthesis for implantation by cement with a stem having a longitudinal axis, a proximal end, a distal end, a collarless shoulder, an anterior side face and a posterior side face, a first subsidiary section and a second subsidiary section, wherein the collarless shoulder is located in the region of said proximal end;
- the stem has in at least one portion a quadrilateral cross section;
- the stem extends along the longitudinal axis and tapers from the proximal end toward the distal end;
- the first subsidiary section begins in the region of the proximal end and extends along the longitudinal axis;
- the second subsidiary section is located distally of the first subsidiary section and extends along the longitudinal axis;
- and
- the anterior side face and the posterior side face, in the direction of the longitudinal axis, have, in the first subsidiary section, a logarithmically extending curvature and thereafter, in the second subsidiary section, extend in a straight line and converge.
Dependencies are inferred from the claim text.