Coronary Atherectomy System in Patients With Coronary Calcification (CORECT)

Clinical Inclusion Criteria: CI1. Age between 18 and 80. CI2. Subjects who are going to accept percutaneous coronary intervention (PCI) and drug-eluting stent implantation. CI3. Asymptomatic evidence of ischemia, stable or unstable angina pectoris, or old myocardial infarction. CI4. Acceptable candidates for coronary artery bypass grafting (CABG). CI5. The left ventricular ejection fraction (LVEF) is equal to or greater than 30% measured by echocardiography or left ventricle contrast examination within 30 days before inclusion. CI6. Subjects who are able to understand the purpose of the trial, participate voluntarily or by proxy and indicate by signing the informed consent form that they recognize the risks and benefits described in the informed consent document and are willing to undergo clinical follow-up. Angiography Inclusion Criteria: AI1. There is only one target lesion that needs to be treated. AI2. The target vessel must be a native coronary artery with reference diameter \>= 2.5mm and \<= 4.0 mm. AI3. The target vessel must be with a stenosis of \>= 70% and \< 100%Target lesion angiographic stenosis, or of \>=50% and \<70% with local ischemic symptoms. AI4. Target lesion length ≤ 40 mm . AI5. The target lesion must have evidence of severe calcium deposit, or moderate calcification which cannot be fully expanded by PTCA balloon catheter at the lesion site based on the protocol criterion, . Clinical Exclusion Criteria: CE1. Acute myocardial infarction wit…