Constraining ring for a hip cup
US5639280A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1996 |
| Grant date | Jun 17, 1997 |
| Priority date | — |
| Expiry date | Feb 2, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2230/0043
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The hip cup of this invention includes a porous metal outer shell, preferably formed from fiber metal, and a compression molded polyethylene component defining an articulating surface at its center for contact with a prosthetic femoral head. The porous outer shell is placed within a mold and the polyethylene component is compression molded within the shell. To prevent the porous shell from collapsing or distorting about its equatorial edge (and thereby distorting the articulating surface) a constraining ring is fitted over the edge of the shell prior to the molding of the polyethylene component. The ring is held in contact with the shell by the molded polyethylene. The constraining ring prevents the edges of the shell from radially distorting during impaction into a prepared acetabulum or during use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.