Particular surface replacement prosthesis
US4911720A · kind A · utility
Inventor
Key dates
| Filing date | Mar 10, 1983 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | Mar 10, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2220/0033
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An articular surface prosthesis composed of a porous material that is substantially noncorrodible and nonbiodegradible by body fluids. The prosthesis serves as a replacement of, for example, a femoral cap. The prosthesis fits over the femur which is shaped, typically, to a right circular cylinder outline, to receive the replacement which has a similarly shaped cavity. The prosthesis fits snugly over the femur and presents at the bone prosthesis interface coarse pores (e.g., 100 to 500 micrometers) to permit bone ingrowth; the pores are graded toward smaller or fine sizes (e.g., <50 micrometers) to prevent bone ingrowth and permit cartilage ingrowth at the articulating side of the prosthesis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.