Evaluation of the Zilver Vascular Stent in the Iliac Arteries (ZIPS)

Inclusion Criteria: * Patient has documented stenotic or occluded atherosclerotic lesions of the external iliac or common iliac artery. * Patient has a de novo or restenotic lesion(s) with no prior stent in the target lesion. * Patient has given informed consent. Exclusion Criteria: * Patient is less than 50 years of age * Patient is participating in another investigational drug or device study. * Patient has multiple lesions (ipsilateral or in the aorta) that would require a staged procedure. * Patient has a history of bleeding diathesis or coagulopathy or will refuse blood transfusions. * Patient has a known hypersensitivity or contraindication to aspirin, clopidogrel, nitinol, or contrast dye that cannot be adequately premedicated. * Patient is pregnant or breast-feeding.