Cap for a femur head
US5133769A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 30, 1991 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Sep 30, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2310/00029
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The cap for a femur head can be imbedded without the use of cement and includes an outer shell of hemispherical shape so that forces an be transferred in various positions of the joint without any discontinuity in the surface. In addition, an inner shell is secured within the outer shell and is provided with a conically tapered internal surface at the outer edge and an internal self-tapping screw thread for screwing onto a stump of a femur head. The shell also has an internal curved surface for abutting against the stump to inhibit continued threading of the cap onto the stump. Internal cutting rings may also be provided internally of the inner shell for cutting into the osseous tissue of the femur head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.