Stenting is like making a tunnel to hold up what is underneath the tunnel by rebar and not collapse. In fact, before making a stent, there must be a stenosis or occlusion of the blood vessel, and the occluded or collapsed blood vessel must be held up to prevent it from collapsing or occluding again. At present, the best method is to implant a stent, which is a metal of titanium, and there may be a coating in this metal, including the coating of drugs, which are slowly released in this coating. Through a special technique, the stent is placed through a catheter at the place where it should be supported to open it up, and after it is opened up like a metal stent, the blood vessel no longer collapses and the blood flow passes smoothly.