Artificial knee joint
US5282870A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1992 |
| Grant date | Feb 1, 1994 |
| Priority date | — |
| Expiry date | Nov 13, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2/38
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An artificial knee joint has a convex femoral part (1) and tibial part (2). At the femoral part (1), which has smaller radii of curvature as bending increases, the tibial part (2) performs a rolling and sliding movement, with the femoral part (1) and the tibial part (2) each comprising a lateral guide surface (F.sub.2, F.sub.2 ') and a medial guide surface (F.sub.1, F.sub.1 '). The medial guide surface (F.sub.1 ') of the tibial part (2) forms a flat guide plane, which with different flex angles, abuts cylindrical guide surfaces (F.sub.1) of the femoral part (1) with line contact, while the lateral guide surface (F.sub.2 ') of the tibial part is trapped by the lateral condyle with different bending angles in the frontal plane in the lateral direction by line contact along circular segments having the same radius of curvature (R.sub.3). The value of this same radius of curvature (R.sub.3) lies between the smallest and largest flex radius (R.sub.n) of the lateral condyle in the track (7).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.