Approval for the boston scientific express sd renal monorail premounted stent system.  The device is indicated as an adjunct to percutaneous transluminal renal angioplasty (ptra) of a single de novo or restenotic atherosclerotic lesion (<=15 mm in length) of the renal artery, located within 5 mm of the opacified aortic lumen, with a reference vessel diameter of 4.0  7.0 mm to assist in the maintenance of vessel patency.