Methods for forming an expandable tubular body having a plurality of braided filaments including a first filament including platinum or platinum alloy and a second filament including cobalt-chromium alloy. The methods include applying a first phosphorylcholine material directly on the platinum or platinum alloy of the first filament and applying a silane material on the second filament followed by a second phosphorylcholine material on the silane material on the second filament. The first and second phosphorylcholine materials each define a thickness of less than 100 nanometers.

In an example of a method for making an NO-releasing polymeric composition, a discrete RSNO adduct is dissolved in a solvent to form a discrete RSNO adduct solution. A polymer material is soaked in the discrete RSNO adduct solution for a predetermined time to swell the polymer material and impregnate the polymer material with the discrete RSNO adduct.

A zwitterionic polymer coating with surface grafting crosslinking, its preparation method and application are disclosed, which relate to surface modification of biomedical materials, pipelines and other medical equipment, such as extracorporeal blood circulation devices, artificial blood vessels, catheters, endoscopes and other medical equipment, to provide functions such as anticoagulation and anti-biological adhesion. The disclosure constructs the zwitterionic polymer coating with simple process and excellent performance by simulating the structure of the blood vessel intima, having the surface micro-nano structure similar to the blood vessel intima, extremely low friction coefficient, soft elasticity and super hydrophilicity, realizing zero activation and zero adhesion of blood platelets, further providing the blood circulation effect of blood undisturbed, which is beneficial to avoiding the problems of thrombus of artificial blood vessels in vivo, various complications caused by clinical blood extracorporeal circulation and the like, and has great clinical application value.