 ST. PAUL, Minn.--BUSINESS WIRE--Cardiovascular Systems, Inc. CSI NASDAQ: CSII, a medical device company developing and commercializing innovative interventional treatment systems for patients with peripheral and coronary artery disease, announced today that the first patients in Canada have been treated with its Diamondback 360 Coronary Orbital Atherectomy System OAS. The first patients in Canada were treated by Sanjog Kalra, MD, Interventional Cardiologist and Cardiac Critical Care P 