Vascular stenting is usually a more common type of interventional procedure. There are several situations in which a stent needs to be placed in a blood vessel: 1. Stenosis: Stenosis of the coronary arteries of the heart requires the placement of a stent, which is probably the most commonly heard of and best understood situation. Other cases include carotid stenosis, which is also a relatively common condition among the elderly. In order to prevent insufficient blood supply to the cerebral vessels, stents are also placed in the carotid arteries to open up the stenosis and allow for better blood flow. Similarly, lower limb artery stenosis is also treated by stenting, which is also a very major solution; 2. Accidental rupture of blood vessels or hemangioma: If not treated, the blood vessels may rupture and bleed, and in this state, stents need to be placed to protect this part of the vessel wall with stents, which can play a protective role. There will be a film on the mesh surface of the stent to isolate the blood from the blood vessel to prevent the weak blood vessel from being further burst by blood pressure; 3. Cerebrovascular accident: such as cerebrovascular aneurysm, it is usually necessary to place a stent to protect this section of blood vessel and avoid the spring ring from being exposed from the aneurysm; there are also some patients with stroke that occur in the cerebrovascular, and some patients with stenosis of intracranial blood vessels, which may also need to be opened by vascular opening.