Patent ID: 8597313
Filing Date: 2013-12-03
Classification: A61B

Abstract:
1. A high-speed rotational atherectomy device for opening a stenosis in an artery having a given diameter, comprising: a guide wire having a maximum diameter less than the diameter of the artery; a flexible elongated, rotatable drive shaft advanceable over the guide wire, the drive shaft having a rotational axis; and at least one eccentric abrading head of single-piece unitary prefabricated construction attached to the drive shaft, the abrading head comprising a geometric center spaced radially from the rotational axis and a center of mass spaced radially from the rotational axis as a consequence of the radial spacing of the geometric center away from the rotational axis, proximal, intermediate and distal portions, wherein the proximal portion comprises a proximal outer surface, the intermediate portion comprises an intermediate outer surface and the distal portion comprises a distal outer surface, the proximal outer surface having diameters that increase distally, the distal outer surface having diameters that decrease distally, and the intermediate outer surface being cylindrical, wherein the proximal portion and the intermediate portion intersect and defining an edge at the intersection and wherein the distal portion and the intermediate portion intersect and defining an edge at the intersection, wherein the eccentric abrading head comprises a nominal diameter and wherein at least the intermediate outer surface comprise tissue removal sections and wherein the abrading head defines a drive shaft lumen therethrough, the drive shaft at least partially traversing the drive shaft lumen, and a hollow cavity comprising a modifiable size and shape for locating the center of mass further radially away from the drive shaft's rotational axis for stimulation of orbital rotational pathing of the at least one eccentric abrading head, wherein at least a portion of the tissue removing sections rotate through a path with a maximum diameter that is between about 200% and about 400% larger than the maximum nominal diameter of the eccentric abrading head.