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:
Mar. 23, 1993
Filed:
May. 07, 1992
Hans-Georg Willert, Gottingen, DE;
Rudolf Koch, Frauenfeld, CH;
Sulzer Medizinaltechnik AG, Winterthur, CH;
Abstract
The invention shows knock-out instruments for the shanks of hipjoint prostheses, the said instrument consisting of a shank (1) with a coupling-part for a sliding hammer (not shown) as well as of an extension-piece (3) which may be applied in the knock-out direction. The extension-piece (3) is connected rigidly to the shank and stands away from it like a foot at an angle .alpha. of between 20.degree. and 60.degree.. The extension-piece exhibits a recess (8) which may be slid from one side over the neck of a hipjoint prosthesis and encircles it over an angle of up to 180.degree., the width inside the recess measured across the 180.degree. being greater by a clearance than the smallest diameter of the neck of the prosthesis, measured in the same direction. The recess is further formed so that it engages the prosthesis in the area of the neck at three points arranged to lie in a plane substantially parallel to the axis of the shank so that, when the line of action of the sliding hammer is offset relative to the shank axis, a moment generated thereby is opposed by a moment generated between the extension piece and the neck at these three points.