Patent ID: 9186170
Filing Date: 2015-11-17
Classification: A61B

Abstract:
1. A rotational atherectomy apparatus for abrading tissue, comprising: a flexible, elongated, rotatable drive shaft having a proximal end and a distal end opposite the proximal end, the drive shaft being rotatable in a cutting direction and in a grinding direction opposite the cutting direction; and an expandable atherectomy head disposed proximate the distal end of the drive shaft, the head rotatably expandable from a rest position with a rest diameter when not rotating to an expanded position with a rotational diameter when the drive shaft is rotated at a high rotational speed and due to centrifugal forces in both the cutting direction and the grinding direction, wherein the rotational diameter is greater than the rest diameter; the head comprising at least two arms that overlap the drive shaft and lie parallel thereto in the rest position and having free ends that extend away from the drive shaft in the expanded position due to the centrifugal forces generated during high speed rotation, each arm comprising an abrasive element comprising: