Abstract: Degradable pure iron stent or iron alloy stent is provided. The stent is made containing 0.01 to 0.5 atom % of La, Ce or Sr. The stent is surface modified using ion implantation or plasma ion implantation to implant oxygen, nitrogen, La, Ce or Sr into the stent surface. The stent may also be manufactured by depositing a thin film of La, Ce, Sr, lanthana, ceria, strontia, iron or iron oxide onto the stent surface. The thickness of the deposited films is from 10 to 1000 nanometers with the grain size from 10 to 200 nanometers. The corrosion resistance of these stents is significantly increased, and the stents have good biocompatibility. The degradation of the stents is controllable. The stents can also provide sufficient support in blood vessel in 3-6 months after intervention and be degraded after 6 months.

Abstract: The present invention discloses at least one to omnidirectionally modify surfaces of organic or inorganic materials by means of plasma immersion ion implantation process to produce TiO2-x films of the materials surfaces (x is about 0˜0.35). The method includes using oxygen which exists as plasma in the PIII vacuum chamber as the environment, creating and introducing titanium and other metallic plasmas which deposit on the materials surfaces, into the vacuum chamber by means of metal arc source, and apply a negative pulse potential of 500˜50,00 Hz and 0.1˜10 kV amplitude on the workpiece. And also the method to by means of implanting H, Ta or Nb into the TiO2-x films to produce TiO2-x films containing H, Ta or Nb. The materials with surface films fabricated by the present invention, when implanted into human body and contacting blood, have obvious improved blood compatibilities.