DCB Treatment in CTO Guided by IVUS

Inclusion Criteria: 1. Over the age of 18, male or female; 2. Patients who meet the diagnostic criteria for coronary heart disease, have clinical symptoms and seek interventional treatment; 3. Coronary angiography confirmed that the blood vessels met the diagnostic criteria of CTO; 4. Sign informed consent and be willing to undergo follow-up for at least 12 months. Exclusion Criteria: 1. Patients with severe contrast allergy who cannot tolerate coronary angiography; 2. Patients known allergy to drug balloon coating; 3. Patients who is pregnant or breastfeeding; 4. Bleeding or other diseases, such as digestive tract ulcers, blood system diseases, etc., limit the use of platelet aggregation inhibitors and anticoagulation therapy; 5. Patients with cardiac shock; 6. Patients with a life expectancy of less than 1 year; 7. Other situations deemed unsuitable for inclusion by the researcher.