Coronary CTO is a more severe form of coronary artery disease that is a chronic and completely occlusive lesion of the coronary arteries that has been in place for more than three months. As confirmed by coronary angiography, due to the long occlusion, the lesions in the vessels become hard, accompanied by tortuous vessels and calcification, etc. The presence of collateral circulation in CTO lesions allows the occluded vessels to have a certain blood supply, but it is only equivalent to the blood supply of 90% of the narrowed vessels, which can only maintain the survival of the resting myocardium, and when the myocardial oxygen consumption increases, patients will have symptoms of myocardial ischemia such as angina pectoris When myocardial oxygen consumption increases, the patient will experience symptoms of myocardial ischemia, such as angina pectoris and decreased exercise tolerance. Successful opening of CTO lesions can relieve angina symptoms, improve myocardial blood supply and stabilize myocardial electrical activity. Coronary intervention is still preferred, but the success rate of intervention varies from hospital to hospital due to the complexity of the vascular lesions and the high rate of complications.