Patent ID: 7507245

Claim:
A rotational angioplasty device comprising: a flexible, elongated drive shaft rotatable about an axis of rotation of the drive shaft, the drive shaft comprising one or more helically wound wires and having an enlarged diameter section capable of being stretched, the enlarged diameter section having a stretched maximum diameter and an unstretched maximum diameter, the enlarged diameter section having a substantially conical proximal portion comprising wire turns, a substantially conical distal portion comprising wire turns and an intermediate portion, the portion formed at the junction between the conical and distal proximal portions, wherein the intermediate portion comprises the stretched and unstretched maximum diameter of the enlarged diameter section of the drive shaft; a substantially circular and hollow prefabricated abrasive crown installed over at least the intermediate portion of the enlarged diameter section of the drive shaft, the abrasive crown comprising: a substantially flat section, the flat section comprising an outer surface and an inner surface terminating in inwardly tapered circumferential lips having a diameter that is less than the maximum unstretched diameter of the enlarged diameter section and greater than the stretched maximum diameter of the enlarged diameter section, the lips further comprising an inner surface and an outer surface; and abrasive material on the outer surface of the substantially fiat section of the abrasive crown, the abrasive material separated from the wire turns of the enlarged diameter section by the abrasive crown, wherein the unstretched wire turns of the substantially conical proximal section and distal proximal section engage the inner surface of the circumferential lips of the installed abrasive crown, and wherein the wire turns of the enlarged diameter section are bonded to and biased against the inner surface of the flat section and biased against the inner surface of the circumferential lips of the installed abrasive crown.