Surface Modification of Low Temperature Isotropic Pyrolytic
Carbon Artificial Heart Valve Material
Huang Nan Yang Ping Leng Yongxiang
Department of Matebial Engineering, Southwest Jiaotong University, Chengdu 610031
Abstract In this study, nitrogen ion implantation and titanium oxide film synthesized by ion beam enhanced deposition were adopted to treat low temperature isotropic pyrolytic carbon(LTIC).The chemical composition and valence state of the modified layer were determined by X-ray photoelectron spectroscopy (XPS) and Auger eletron spectroscopy (AES).The electric resisitance and the surface energy were measured by the four-probe system and the contact angle method respectively. The blood compatibility of the modified LTIC was evaluated by clotting time measurement and platelet adhesion test. The results showed that carbon-nitride was formed on the LTIC surface after N+ ion implantation, which had come effect on the improvement of blood compatibility, and a significant improvement of blood compatibility of LTIC coated by TiO2-x film was verified.
Key words Artificial heart valve material LTIC Surface modification Ion beam Blood compatibility
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