SAN CLEMENTE, CA — Reflow Medical, Inc. announces that the Medical University of Graz has enrolled the first patient in the DEEPER CHALLENGE clinical trial. This investigator-initiated, single-center, single-arm, prospective study, supported by a grant, investigates early vessel recoil following below-the-knee treatment using the Spur® Peripheral Retrievable Scaffold System in combination with a commercially available drug-coated balloon.