The Effectiveness of Covered Stent Viabahn and Drug-coated Balloon for Complex Femoropopliteal Artery Lesions

Inclusion Criteria: 1. The patient is ≥ 18 years old. 2. Patient understands the nature of the procedure and provides written informed consent before enrolment in the study 3. The patient is willing to comply with specified follow-up evaluations at the specified times. 4. The patient presented a score from 2 to 5 following Rutherford classification. 5. The patient has a projected life expectancy of at least 24 months 6. Subject has a de novo or restenotic lesion with ≥ 70% stenosis in femoropopliteal artery, and for de novo lesion, the total lesion length ≥ 25cm, or chronic total occlusion (CTO) length ≥15cm. Exclusion Criteria: 1. Patients with known hypersensitivity or contraindication to any of the following medications: Contrast media, Nitinol-titanium, antiplatelet therapy, anticoagulants, or thrombolytics therapy 2. Pregnant women or Female patients with potential childbearing 3. Patients who exhibit acute intraluminal thrombus at the target lesion vessel 4. Significant gastrointestinal bleeding or any coagulopathy that would contraindicate the use of anti-platelet therapy 5. The patient is currently participating in another investigational drug or device study that interferes with the study