Press fit connection between prosthesis components of joint prostheses

US6797007B1 · kind B1 · utility

Assignee

• Ceramtec AG, Innovative Ceramic Engineering · DE

Inventors

• Wilfried Von Chamier · Stuttgart, DE
• Ernst Hoch · Notzingen, DE

Key dates

• Filing date: Nov 27, 2000
• Grant date: Sep 28, 2004
• Expiry date: Feb 14, 2022

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2310/00407
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Joint prostheses which have one joint partner configured as a socket and the other joint partner configured as a ball head generally consist of two components. The socket is comprised of a metallic outer cup in which an insertion cup made of ceramic material or of a biocompatible plastic is inserted. The shaft has a peg, the so-called cone, on which a ball head is placed. The press fit connection, especially so-called conical pressing, is used as a connection technique between the respective components. Stress can result in a relative movement between the components, thus leading to a wear-related loosening of the connection thereof. In order to solve this problem, the invention provides that, from the prosthetic components (2, 3), the component (3) made of ceramic or plastic fitted with a covering (6), said covering being made of a biocompatible metal or of a biocompatible metal alloy, on the pressing surface (7) thereof via which said component (3) is connected to the metal component (2).