Surface modified coat of bracket of blood vessel, and preparation method thereof

A coated layer for modifying the surface of vascular scaffold by controlling the content of polyoxyethene in the coated layer to regulate its medicine-carrying performance and the release of medicinal is a polysulfone-polyoxyethene block copolymer with 10000-300000 for its number average molecular weight. Its preparing process features that said block copolymer is coated on the surface of said vascular scaffold directly or after the medicine is added to its solution.