Surface hardened biocompatible metallic medical implants
US5415704A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 13, 1993 |
| Grant date | May 16, 1995 |
| Priority date | — |
| Expiry date | Sep 13, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2310/00856
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
This invention provides surface hardened, abrasion resistant high strength, biocompatible metal medical implants, in particular, titanium alloy implants which do not include any elements which have been shown or suggested as having short term or long term potential adverse effect from a standpoint of biocompatibility. Further, the invention provides methods of strengthening and hardening the surfaces of other titanium, zirconium, and cobalt-based alloy implants with small concentrations of a metal solute such as zirconium, yttrium, tantalum, aluminum, silicon, chromium, or thorium via internal oxidation or nitridation. Alternatively, nitrogen, oxygen, or carbon can be diffused directly into the surface of the implants by interstitial hardening to further increase the surface abrasion resistance of these internally oxidized or internally nitridized implant metal or metal alloys.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.