Artificial hip joint socket with hydraulic head support
US4840631A · kind A · utility
32Cited by
3References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 29, 1988 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | Feb 29, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2002/3611
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A liquid chamber (3) arranged in the bottom of the socket cavity (2) is latitudinally sealed by the engaging ball head (4) of the femoral prosthesis shaft. The ball head (4) of the hip joint prosthesis is supported hydrostatically by the liquid chamber (3) filled with synovia and sealed by the ball head following a deformation of the elastic sealing edge (5). By means of the hydrostatic support, the friction moment increases only a little when the load becomes higher and approaches a constant value which is considerably lower than in conventional hip joint sockets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.