artificial blood vessels made of synthetic fibers block the holes of 85%-90% by coagulation to form a biofilm to prevent coagulation from continuing to generate, leaving about 10% holes to allow tissue to grow and fix them. Polytetrafluoroethylene artificial blood vessel is anticoagulant. A number of holes are opened in the wall of the tube, and water-soluble polyvinyl alcohol is filled in these holes. As a result, a hydrophilic film is formed on the surface of tetrafluoroethylene to prevent plasma protein Attachment. On the outside of the PTFE tube with an inner diameter of 6mm, a wall thickness of 0.5mm, an average pore diameter of 8 μm and a void ratio of 82%, polyurethane adhesive is coated, and finally a continuous porous polyurethane film with an average pore diameter of 200 μm and a void ratio of 85% is coated with 0.5mm. This adhesive layer is the barrier layer.