Zilver® Flex™ Vascular Stent Study

Inclusion Criteria: * Patients who are at least 18 years old and have at least 1 stenotic atherosclerotic lesion of the above-the-knee femoropopliteal artery may be considered for enrollment. * To be enrolled in the study, the lesion must be the appropriate size and and no prior stent in the target vessel may be present. Exclusion Criteria: * Patient is \< 18 years of age. * Patient is pregnant or breast-feeding. * Patient is simultaneously participating in an investigational drug or device study. The patient must have completed the follow-up phase for the primary endpoint of any previous study at least 30 days prior to enrollment in this study. * Patient has had previous stenting of the target vessel. * Patient has a medical condition or disorder that would limit life expectancy to less than 1 year or that may cause noncompliance with the protocol or confound the data analysis. * Patient in whom antiplatelet and/or anticoagulant therapy is contraindicated. * Patient has a history of bleeding diathesis or coagulopathy or will refuse blood transfusions. * Patient has known hypersensitivity or contraindication to aspirin, antiplatelet medication, contrast dye, or nitinol that, in the opinion of the investigator, cannot be adequately premedicated.