For patients with coronary artery disease, there are still certain risks after stenting, as follows: First, the risk of the stent itself, after stenting, only solves a fixed stenosis of the coronary artery, but as a solution to the fixed stenosis of the stent, there is still a risk of restenosis and thrombosis in the stent, etc. In order to effectively prevent or detect this risk early, it is recommended that patients In order to effectively prevent or detect this risk early, it is recommended that patients undergo coronary angiography again within six months to one year after stent placement. Second, drug-related risks, after stenting, in order to prevent the occurrence of adverse events such as restenosis in the stent, it may be necessary to take a large number of antiplatelet drugs, the most common ones such as aspirin, Tegretol, etc., because aspirin has the side effect of damaging the mucosa of the gastrointestinal tract, resulting in gastrointestinal bleeding in some patients, and subcutaneous bleeding in others.