ST. PAUL, Minn.--(BUSINESS WIRE)--Cardiovascular Systems, Inc. (NASDAQ:CSII) (CSI), today announced that it has received FDA clearance for its new ViperWire Advance® Peripheral Guide Wire with Flex Tip for their Peripheral Orbital Atherectomy Systems (OAS). The new guide wire provides physicians with improved flexibility, navigation and ease-of-use—particularly in hard-to-reach, tortuous vessels—when treating arterial calcium associated with peripheral artery disease (PAD). Building on the succ