ALEXANDRIA, Va., June 12 -- United States Patent no. 12,295,612, issued on May 13, was assigned to Cardio Flow Inc. (St. Paul, Minn.).

"Atherectomy devices and methods" was invented by Michael Kallok (St. Paul, Minn.), Cassandra Ann Piippo Svendsen (Blaine, Minn.), Paul Joseph Robinson (Mahtomedi, Minn.), Charles Anthony Plowe (Blaine, Minn.) and Albert Selden Benjamin (St Paul, Minn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Rotational atherectomy devices and systems can remove or reduce stenotic lesions in implanted grafts by rotating one or more abrasive elements within the graft. The abrasive elements can be attached to a distal portion of an elongate flexible drive shaft that extends from a handle ...