Stents can be placed only after 3 months of cerebral infarction in general. This is because in acute cerebral infarction in clinical practice, the intracranial condition is very unstable. If a stent is placed at this time, it is likely to open up the blood vessels and increase blood flow to form the phenomenon of overperfusion, that is, excessive blood flow. When the blood pressure control is unstable and the intracranial condition is unstable, it is easy to induce bleeding after infarction. The impact on the patient is very great. If about 3 months, the relevant conditions of the body have been stabilized and the corresponding intracranial compensation has been formed. At this time when stenting is performed, the blood flow impact will also be very small, and a part of the blood flow may also be restored, thus improving some of the functions. Therefore, in clinical practice, stents can be placed only after about 3 months of infarction.