A Randomized Study of Cutting Balloon Catheter for CAD

Inclusion Criteria: * Subjects aged 18-80 years, including 18 and 80 years; * Patients with stable or unstable angina, or old myocardial infarction or clinically judged silent myocardial ischemia (target vessel reference vessel diameter 2.00-4.00 mm (both inclusive)), luminal diameter stenosis ≥ 70%, or ≥ 50% by visual inspection with evidence of ischemia, TIMI blood flow ≥ grade 1, and requiring treatment with a cutting balloon dilatation catheter as considered by the operator; * Able to understand the purpose of the study, participate the study willingly, sign the written informed consent form, and are available for and willing to follow-up as defined in this trial. General exclusion criteria: 1. Pregnant or lactating women or women who are planning pregnancy; 2. Subjects with myocardial infarction occurred within one week; the myocardial enzyme TNI or TNT has not returned to normal although myocardial infarction has occurred for more than one week; 3. Subjects who are considered by the investigator through angiography that the cutting balloon cannot pass through even dilatation with a small one and need a rotational atherectomy; 4. Non-target vessels, which can be treated simultaneously with the target blood vessel, have not been treated well in advance, or the total number of lesions on the non-target blood vessel is \> 3; 5. NYHA Class IV patients; 6. Patients with severe renal failure (creatinine \> 443 μmol/L) or ongoing hemodialysis therapy; 7. Heart transplant patients; 8. Patients with graft vessel disease; 9. Patients with hemodynamic instability or symptoms of shock; 10. Patients with a life expectancy of no more than 1 year; 11. Patients who are expected to undergo elective surgery within 1 month; 12. Patients not eligible for coronary artery bypass grafting (CABG) procedure; 13. Patients with a predisposition to bleeding, a history of active peptic ulcer, or contraindications to antiplatelet agents and anticoagulants, patients who cannot undergo anticoagulant therapy, or patients who have experienced hemorrhagic stroke within 6 months; 14. Patients who are known to be allergic or contraindicated to heparin, contrast agents, etc.; 15. Patients who are suffering from diseases that can cause difficulties in treatment and evaluation; 16. Patients who have been selected and have participated in trials with other drug or medical device but have not reached the time limit of the primary study endpoint; 17. Clinicians expect that the risk of interventional surgery is extremely high or other cases that should be ruled out; 18. Patients who, in the judgment of the investigator, are poor compliance with the therapy and are unable to complete the trial as required; Lesion related exclusion criteria: 19. Left main lesion or lesion at a distance of ≤ 2 mm from the left main coronary artery; 20. Patients with thrombosis suggested by angiography; 21. Patients with a total occluded lesion and a TIMI flow grade 0; 22. Coronary artery spasm (CAS) without organic stenosis; 23. Left main lesion without protection from bypass grafts or collateral flow; 24. In addition to the above contraindications, conditions diagnosed by the physician as unsuitable for the use of the device.