Anchorage for highly stressed endoprostheses

US4202055A · kind A · utility

Assignee

• Battelle Institute e.V. · DE

Inventors

• Roland Reiner · Basel, CH
• Helmut Heide · Kelkheim, DE
• Kari Koster · Lorsbach, DE

Key dates

• Filing date: May 12, 1977
• Grant date: May 13, 1980
• Expiry date: May 12, 1997

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2310/00796
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

An implantable prosthesis anchorage which contains a non-porous outer coating in the regions which is positioned in contact with bone. The non-porous outer coating consists of (i) at least one bioactive resorbable ceramic material which is a calcium phosphate and (ii) at least one polymer which is mechanically and chemically stable in the body. The ceramic material is in particulate form having particle diameters between 0.5 and 1 mm. The ceramic material particles is incorporated in the polymer in such a way that resorption of the ceramic material leads to a polymer structure with continuous pores filled with living bone tissue. Bioactivating bonding residues of the ceramic material are left on the inner surfaces of the filled pores which were created by the resorption of the ceramic material.