Adjustable hip-joint endoprosthesis

US6083263A · kind A · utility

Inventors

• Klaus Draenert · Ottobrunn, DE
• Ortwin Piper · Schwieberdingen, DE

Key dates

• Filing date: Apr 8, 1997
• Grant date: Jul 4, 2000
• Expiry date: Apr 8, 2017

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2250/0004
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A hip-joint endoprosthesis is provided which has a prosthesis head (5) that can be medio-laterally displaced parallel to a tangent that rests on the lateral edge of the proximal femoral infundibulum of the hip-joint (b) and contacts the inner contour of the curved neck of the femur (b'). This hip-joint endoprosthesis allows the centre of rotation of the hip-joint to be reproducibly adjusted by means of an adjustable head (5). Toothings (12, 13, 15, 16) ensure a (fine) stepped adjustability of the displacement in the medio-lateral direction (B--B') and of the rotation around an axis (A--A) that is perpendicular to the plane of displacement (B--B'). Securing is allowed by a single screw (10) that braces the engaged toothings (12, 13, 15, 16) against each other. The height of the joint ball (6) mounted on the prosthesis head (5) via a cone (17) can be adjusted by joint balls (6) having pressed-in cones of varying depths.