Joint prosthesis
US6818019B2 · kind B2 · utility
Inventor
Key dates
| Filing date | May 16, 2003 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | May 16, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/32311
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In a joint prosthesis the head cap is connected via a collar piece to the shaft piece which may be anchored in the bone. The collar piece is coupled to the shaft piece by a joint head in a ball-jointed manner. The articulation surfaces between the joint cavity in the shaft piece and the articulation head on the collar piece are embodied such that on pressing the articulation head to the base of the joint cavity, edges or projections on the one articulation surface digs into the other articulation surface lying on a virtual spherical surface. It is thus possible to achieve a ball-joint like articulation, whereby the spherical surfaces may have a relatively large production tolerance without the above affecting the clamping connection between the articulation surfaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.