Studies on Plasma Modification on Polyurethane Surface for the Improvement of Blooa Compatibility

<正> Surface modification of biomedical polyurethane material by means of glowdischarge plasma was investigated in this study. After exposing the material to N. or N./H. plasma for thirty minutes, the hemocompatibilily of the material is significanlly improved according to the in-vitro evaluation presented in the article. The interracial free energy of the surface with water after modification enters the range of one to three dyn/cm after plasma being treated under the optimal technical parameters presented. The haemolytic percentage of the treated polyurethane is less than 5%, indicating that the treated material is a satisfactory candidate for clinical uses.