Bioactive surface layer for bone implants
US6221111A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1999 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | Jan 23, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2310/00796
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A bioactive surface layer with 0.01 .mu.m to 5 mm thickness is suitable for a metallic bone implant. The surface layer has the following composition: (A) calcium compounds (CaX) consisting of crystalline calcium phosphate (CaP), calcium apatites (CaAp) and/or calcium carbonate (CaCO.sub.3), in a proportion expressed by the following equation: 100% (CaX)=.SIGMA.[x % (CaP)+y % (CaCO.sub.3)], in which x+y+z=100, 0.ltoreq.x.ltoreq.100; 0.ltoreq.y.ltoreq.100; 0.ltoreq.z.ltoreq.100, and in the form of particles 20 nm to 4 mm; and (B) amorphous or crystalline metal oxide (MeO). The ratio between CAX and MeO in the surface layer can be preferably varied as a result of the specific coating process. The thickness of the surface layer lies between 0.01 .mu.m and 5 mm and the CaX particles are 20 nm to 4 mm large.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.