[Hemocompatibility evaluation in vitro of small-caliber expanded polytetrafluoroethylene vessel with silk fibroin coating sulfonated by low temperature plasma].

ABSTRACT

OBJECTIVE: To evaluate the hemocompatibility of a small-caliber expanded polytetrafluoroethylene vessel with silk fibroin coating sulfonated by low temperature plasma treatment. METHODS: The composite blood vessel was prepared by first coating the small-caliber expanded polytetrafluoroethylene vessel with silk fibroin followed by sulfonation by low temperature plasma treatment. After hemolysis test in vitro, dynamic coagulation time test, blood platelet adhesion test, and recalcification time test were performed to evaluate the hemocompatibility of the composite blood vessel. RESULTS: Scanning electronic microscopy revealed obvious platelets adhesion on the conventional artificial (control) vessel, which seldom occurred on the composite vessel. The curve of absorbance-clotting time of the composite vessel declined more slowly than that of the control vessel. The recalcification time of the composite blood vessel averaged 603 s, significantly longer than that of the control vessel (480 s, P = 0.000). CONCLUSION: The composite blood vessel has good antithrombotic activity and hemocompatibility as a promising vascular prosthesis.