Stents can be categorized into bare metal stents, drug-coated stents and bioabsorbable stents according to their nature, and suitable stents should be selected according to different situations. 1. Bare metal stent: It is the earliest used stent, which is mainly composed of metal, relatively inexpensive, and does not contain any medication, and it can play a good supporting role for blood vessels. However, its disadvantage is that it can be easily treated as a foreign body by the body, which may lead to re-stenosis of blood vessels. 2. Drug-coated stent: the surface of the stent is coated with drugs that can inhibit the proliferation of vascular endothelium and reduce inflammation, which can significantly reduce the formation of blood clots and prevent re-stenosis of blood vessels. 3. Bio-absorbable stent: It is composed of absorbable biomaterials, which can be absorbed and degraded by the body after the completion of vascular remodeling, thus avoiding the presence of foreign materials in the body. It is recommended that patients choose the appropriate stent treatment under the guidance of specialized physicians.