Universal joint prosthesis
US5549704A · kind A · utility
Inventor
Key dates
| Filing date | Mar 30, 1995 |
| Grant date | Aug 27, 1996 |
| Priority date | — |
| Expiry date | Mar 30, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2310/00407
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The universal joint prosthesis has a cap which has an outer shell, an inner shell, a calotte-shaped, smooth outer surface formed by the outer shell and an inner surface formed by the inner shell and having projections distributed along the circumference. At least some projections have undercuts and/or are provided with through holes. The outer material forming the outer shell has, with the same surface characteristics, a smaller coefficient of friction than the inner material forming the inner shell. On the other hand, the inner material permits a firmer bond with a bone than the outer material. The universal joint prosthesis also has perforated sleeves projecting from the cap. The universal joint prothesis can usually be attached firmly to a bone without a binder, the undercuts and/or holes helping to provide a permanent connection between the cap and the bone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.