Clinical Study of Stent Versus Direct Atherectomy to Treat Iliac Artery Occlusive Diseases

Inclusion Criteria: 1. The patients have non thrombotic arteriosclerosis obliterans of the common iliac or external iliac arteries 2. Clinical diagnosis of stenosis or occlusive disease 3. The patients have unobstructed distal outflow tract 4. Receiving surgical treatment at the same time Exclusion Criteria: 1. The patients who have previously implanted stent(s) or stent graft(s) in target leg 2. Life expectancy less than 12 months 3. Has any planned surgical or endovascular intervention of target vessel 30 days before or after index procedure 4. Thrombophlebitis, uremia, or deep venous thrombus, within past 30 days 5. Receiving dialysis or immunosuppressant therapy 6. Recent stroke within past 90 days 7. Known allergies to the following: aspirin, clopidogrel bisulfate (Plavix®) or ticlopidine (Ticlid®), heparin, Nitinol (nickel titanium), contrast agent, that cannot be medically managed 8. Tissue loss due to ischemic disease (Rutherford/Becker category 5 or 6) 9. Serum creatinine level \>/= 2.5 mg/dl at time of screening visit 10. Known or suspected active infection at the time of the procedure 11. Bleeding diathesis 12. Patient is unwilling or unable to comply with procedures specified in the protocol or has difficulty or inability to return for follow-up visits as specified by the protocol. 13. Patients are known to be pregnant, incarcerated, mentally incompetent, and/or alcohol or drug abuser. 14. Patients are currently participating in any other investigational drug or medical device study that has not completed primary endpoint(s) evaluation or clinically interferes with the endpoints from this study or future participation in such studies prior to the completion of this study.