The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 31, 1990
Filed:
Sep. 11, 1986
Helmut D Link, Hamburg, DE;
Arnold Keller, Kayhude, DE;
interplanta Arzt-und Krankenhausbedarf GmbH, Hamburg, DE;
Abstract
The invention relates to a femoral hip-joint endoprosthesis having a shaft to be inserted into the medullary cavity (4) of the femur (1) and a support plate (7), which terminates the shaft proximally and the under surface (12) of which is provided for support on the resection surface (16) of the bone. The overall axis (6) of the resection surface is inclined. The prerequisites for the transfer of forces from the prosthesis to the bone are improved when the under surface (12) and the resection surface (16), which is prepared to be of the same shape, are formed so that the medial part of the under surface includes an angle with the axis of the femur which is, on average, larger than its lateral part. A cylindrical shape of the two surfaces witha cylindrical axis running from anterior to posterior, or a spherical shape, are particularly advantageous. Furthermore, it is advantageous to form the under surface as a surface of revolution about a rotation axis running transverse to the under surface. This permits very exact preparation of the resection surface with a cutter which is held in a predetermined position by a holding shaft which coincides with the shaft of the prosthesis and which is inserted in the medullary cavity of the bone.