Artificial hip joint socket

US6379389B1 · kind B1 · utility

Assignee

• Stratec Medical AG · CH

Inventor

• Rudolf Koch · Oberhaching, DE

Key dates

• Filing date: Jul 2, 2001
• Grant date: Apr 30, 2002
• Expiry date: Jul 2, 2021

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2310/00203
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A hip-joint socket having an outer shell (1) with a central axis (7) that is to be anchored in the hip bone. The outer shell is detachably mounted, in a geometrically locking manner, on a plastic intermediate shell (1a) exhibiting a hollow-spherical inner side (2). The hip-joint socket also has a wear-resistant inner shell (3) with a spherical outer side (4) and a central axis (8) that is designed to receive a joint ball of a femur shaft. The outer side (4) of the inner shell (3) can be undetachably mounted in a geometrically locking manner to rest against the inner side (2) of the intermediate shell (1a) such that the two central axes (7, 8) coincide. Mutually engaging elements are present at the inner shell and intermediate shell (3 resp. 1a) that consist, on one hand, of a prismatic salient (5) configured at the vertex (9) of the inner shell (10) on the outer side (4) and, on the other hand, of a prismatic recess (6) configured at the vertex (10) of the intermediate shell (1a) on the inner side (2). The salient and recess reliably preclude the mutually contacting inner and intermediate shells (3 resp. 1a) from rotating about their central axes (7, 8) and from canting relative to…