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Pulsed cathodic arc plasma technology deposition of thromboresistant nanostructural carbon coating on components of artificial heart valves

Tochitsky E.I.

Inżynieria Biomateriałów

2006

R. 9, nr 56-57

12-16

This paper describes the results of applying of pulsed cathodic-arc plasma (PCAP) method formation in vacuum biocompatible and thromboresistant t-a carbon coatings on the components of artificial heart valves (AHV). The special pulsed arc plasma source was used for evaporation of the graphite cathode to form pulsed accelerated carbon plasma flows and deposited them on polished samples of titanium alloys and components AHV made of the same alloys. Influence of the initial voltage of cathode arc discharge in range of 100-450V and temperature of substrate during the deposition in the range 293-773 degrees of Kelvin on structure, phase composition, hardness and biomedical properties coatings were investigated. The results of investigation of biomedical properties t-a carbon films deposited by PCAP method have shown that the best biocompatibility and thromboresistivity have the nanostructural carbon coatings with cluster size 10-20nm and thickness 0,08-0,1 microns. The artificial heart valves with deposited nanostructural t-a carbon coatings were implanted on ten animals (dogs). The obtained results have shown that the passing of blood through AHV leads to moderate activation of coagulation processes.