Endoprosthesis

US4978357A · kind A · utility

Assignee

• Mecron Medizinische Produkte GmbH · DE

Inventors

• Volkmar Goymann · Essen, DE
• Emmanuel Anapliotis · Berlin, DE
• Curt Kranz · Berlin, DE

Key dates

• Filing date: Jun 10, 1988
• Grant date: Dec 18, 1990
• Expiry date: Jun 10, 2008

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2230/0013
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

An endoprosthesis is equipped with a collar and a prosthesis shaft and is adapted to be anchored longitudinally in a bone without the use of cement. A hip endoprosthesis can be constructed for anchorage in the proximal femur, in which the prosthesis shaft is composed of a plurality of parallel interconnected thin plates which are configured as plate-shaped partial faces and which have peripheral cutting edges which face away from the prosthesis collar. A tibial plateau prosthesis can be similary constructed, and includes a tibial plateau and a supporting structure formed of thin plates which extend in a common direction and which are interconnected. Both types of prosthesis can be driven into the bone without destruction of existing bone tissue and without removal of spongiosa. A shaft structure is employed which ensures the firmest possible anchorage in the medullary space, with a porous surface being provided to facilitate the in-growth of spongy material to thereby increase the strength of the anchorage of the prosthesis shaft.