According to academic statistics, 20%-40% of stroke patients are caused by carotid artery stenosis. Therefore, carotid artery stenosis accounts for a large proportion of stroke patients. In addition, the severity of stroke is also quite impressive. 38% of patients die in the first attack of a severe stroke, and another 10% in the second attack. So it is said that cerebrovascular disease can lead to death when a stroke occurs, and severe carotid stenosis has a large part in it being the cause. In case of mild cerebral ischemia, such as TIA attack, transient attack, half an hour or two hours, the symptoms of cerebral ischemia will be cured, and the percentage of such patients who have irrecoverable stroke within 90 days is about 10%.