| 摘要 |
<p>In a process of fabricating a stent composed primarily of niobium alloyed with a trace amount of zirconium, tantalum, or titanium for hardening, the stent is annealed under vacuum in a substantially oxygen-free environment. The vacuum is preferably maintained at pressure less than 10<-4> millibars, oxygen-content less than about 80 parts per million, and the annealing temperature exceeds 400°C for at least one hour, and is preferably kept in a range from about 1100-1200°C for several hours. This may be followed by applying a surface layer of oxide, such as iridium oxide, with a thickness of 299-300 nm to the stent.</p> |
