Hip joint prosthesis
US4408359A · kind A · utility
6Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1981 |
| Grant date | Oct 11, 1983 |
| Priority date | — |
| Expiry date | Apr 7, 2001 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2230/0034
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A total hip joint prosthesis has a ball, replacing the ball of the hip joint ball and socket, affixed to the femur by a stem. Stem stress is reduced by providing a rounded cross-section of the stem truncated along the lateral side in the critical section subject to greatest cyclic loading. The stem is of controlled low flexibility so that when the bone cement and stem composite structure is in place, the bone is subject to a maximum percent of normal stress from bending moments. By virtue of the truncated shape and its size relative to the bone cavity, stress in the stem is minimized when the stem alone carries the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.