Safety and Efficacy of POT PTCA Balloon Dilatation Catheter for the Optimal Dilation After DES Implantation

Inclusion Criteria: 1. Provision of informed consent prior to any study specific procedures; 2. Men and women 18 years and older; 3. Patients with asymptomatic myocardial ischemia, stable or unstable angina, or acute myocardial infarction with symptoms lasting more than 12 hours; 4. The target lesions was de novo lesion; 5. Reference vessel diameter of target lesion is between 2.25-4.0mm, and the lesion length is less than 15mm(visual inspection); 6. Diameter stenosis of target lesion diameter ≥70% or ≥50%(visual) with ischemia evidence; 7. DES was successfully implanted in target lesions; 8. TIMI 3 blood flow of target vessel before post-dilation. Exclusion Criteria: 1. Subjects had clinical symptoms and/or ECG changes consistent with ST-elevation myocardial infarction within 12 hours; 2. Allergies to concomitant medications required by the balloon/stent system or protocol used in the study; 3. Cannot tolerate dual antiplatelet therapy; 4. Life expectancy is less than 6 months; 5. Pregnant or lactating women; 6. Participating in another clinical trial and has not completed the primary endpoint observation of the trial; 7. Planned multiple operations, failed to follow the treatment prescribed in the protocol or affected data analysis and interpretation; 8. Restenosis disease; 9. Target lesions with severe calcification require rotary grinding treatment.