While Cardiovascular Systems, Inc. (CSI) deals with blood, there's no crime scene investigation here. Its Orbital Atherectomy Systems (OAS) treat calcified and fibrotic plaque in arterial vessels throughout the leg and heart in a few minutes of treatment time, and address many of the limitations associated with existing surgical, catheter and pharmacological treatment alternatives. CSI's Diamondback 360°, Predator 360°, and Stealth 360° products are minimally invasive catheter systems that help restore blood flow to the legs of patients with peripheral arterial disease (PAD), a condition that occurs when plaque builds up on limb arteries; and address the effects of coronary arterial disease (CAD).