An intracranial stent, often a cylinder of nickel-titanium alloy with a large mesh, can both repair or block spring coils in the vessel wall and ensure blood flow to normal arteries. However, this stent is inside the arterial vessel and is a metallic foreign body to the body, and blood tends to superfluous on the stent, forming a thrombus, which can in turn cause cerebral infarction when dislodged. Therefore, patients who apply intracranial stents need to apply drugs to prevent thrombosis. These drugs are mainly anti-platelet aggregation drugs, and aspirin and poliovirus are the most commonly used anti-platelet aggregation drugs. Therefore, patients with intracranial stents placed often need to take aspirin and Polivir, both before and after surgery.