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. 21, 1998
Filed:
Oct. 23, 1996
Michael D Ries, Cooperstown, NY (US);
Brian Austin, Germantown, TN (US);
David L Evans, Bartlett, TN (US);
Steve Miller, Memphis, TN (US);
Jeff Shea, Memphis, TN (US);
Smith & Nephew, Inc., Memphis, TN (US);
Abstract
An improved acetabular cup prosthesis has a cup body with inner convex and outer concave surfaces. The cup body has an apex and a base that defines a plane. The cup body outer convex surface has a toroidally shaped portion between the base and the transition. In one embodiment, the outer convex surface is toroidally shaped between the rim and a distance about one third of the distance of the rim to the apex. In another embodiment, a plurality of cup bodies are provided in a range of sizes between about 40 mm and 80 mm. Each cup body has a companion rotary reamer that is correspondingly shaped. The companion cup body is oversized between about 1 mm and 3 mm so that a generally constant change in volume is provided for all cup sizes between 40 mm and 80 mm.