The Study of the BX VELOCITY Stent In Patients With De Novo Coronary Artery Lesions.

Inclusion Criteria: 1. Diagnosis of angina pectoris as defined by Canadian Cardiovascular Society Classification (CCS I, II, III, IV) OR unstable angina pectoris (Braunwald Classification B\&C, I-II) OR patients with documented silent ischemia; 2. Treatment of a single de novo native coronary artery lesion in a major coronary artery in patients with single or multi-vessel disease; patients with multiple lesions can be included only if the other lesions do not require treatment; 3. Target vessel diameter at the lesion site is \>=2.50mm and \<=3.0mm in diameter (visual estimate); 4. Target lesion is \>=15mm and \<=32mm in length (visual estimate); 5. Target lesion stenosis is \>50% and \<100% (visual estimate); Exclusion Criteria: 1. Patient has experienced a Q-wave or non-Q-wave myocardial infarction with documented total CK \>2 times normal within the preceding 24 hours and the CK and CK-MB enzymes remains above normal at the time of treatment; 2. Has unstable angina classified as Braunwald III B or C and A I-II-III, or is having a peri infarction; 3. Unprotected left main coronary disease with \>=50% stenosis; 4. Significant (\>50%) stenoses proximal or distal to the target lesion that might require revascularization or impede runoff; 5. Have an ostial target lesion; 6. Angiographic evidence of thrombus within target lesion; 7. Heavily calcified lesion and/or calcified lesion which cannot be successfully predilated; 8. Documented left ventricular ejection fraction \<=25%;