Patent ID: 8795303

Claim:
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 having a controllable drive shaft rotation speed; at least one eccentric abrading head comprising a geometric eccentricity and a center of mass radially offset from the rotational axis of the drive shaft, wherein the at least one eccentric abrading head is attached to the drive shaft, and comprising: a connecting portion fixedly attached to and at least partially surrounding the drive shaft, the connecting portion attached to the drive shaft and being formed from a connecting portion material, wherein the connecting portion is an incomplete cylinder having a center of mass that is concentric with the rotational axis of the drive shaft; an eccentric portion fixedly attached to and at least partially surrounding the connecting portion and formed from an eccentric portion material different from the connecting portion material, the eccentric portion including a proximal portion, a central portion adjacent to the proximal portion, and a distal portion adjacent to the central portion opposite the proximal portion; and an abrasive portion disposed on an exterior surface of the central portion; wherein the eccentric portion material is more dense than the connecting portion material, and wherein the center of mass of the at least one eccentric abrading head is radially offset from the rotational axis of the drive shaft as a result of a combination of the geometric eccentricity of the at least one eccentric abrading head and the more dense material of the eccentric portion.