FIELD: medicine. SUBSTANCE: method provides increase in clotting resistance of thermoplastic material surfaces and decrease in rate of complement activation by conducting the steps of solvent extracting the constituents from surface layer of the material, drying and treating the resulting product successively with solution of sulfuric anhydride in inert solvent and base with subsequent removing the reactants by evaporation in vacuum. EFFECT: increased coagulation tolerance. 1 tbl
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