Eccentric abrading and cutting head for high-speed rotational atherectomy devices

摘要

The invention provides a rotational atherectomy device having, in various embodiments, a flexible, elongated, rotatable drive shaft with at least one flexible or inflexible eccentric enlarged abrading and cutting head attached thereto which comprises an abrasive surface. When placed against stenotic tissue and rotated at high speed, the eccentric nature of the abrading and cutting head moves along an orbital path, opening the lesion to a diameter larger than the resting diameter of the enlarged abrading and cutting head. Preferably the abrading and cutting head has a center of mass spaced radially from the rotational axis of the drive shaft, facilitating the ability of the device to travel along an orbital path. The abrading and cutting head comprises proximal and/or distal radiused surfaces that facilitate cutting difficult stenosis material while minimizing trauma to the vessel. In some cases, the abrading and cutting head is made from a relatively dense metal.

主权项

1. A high-speed rotational atherectomy device for opening a stenosis in an artery, comprising:
a guide wire having a maximum diameter less than a diameter of the artery; a flexible elongated, rotatable drive shaft advanceable over the guide wire and having a rotational axis; and a single piece unitary construction eccentric abrading head secured to the drive shaft and comprising proximal, intermediate and distal portions; wherein the proximal portion comprises a proximal outer surface having diameters that increase distally and a radiused proximal leading edge; wherein the intermediate portion comprises a cylindrical intermediate outer surface that includes at least one tissue removal section; wherein the distal portion comprises a distal outer surface having diameters that decrease distally, the intermediate portion disposed between the proximal and distal portions; wherein the abrading head defines a drive shaft lumen therethrough at least partially traversed by the drive shaft; and wherein the abrading head has a center of mass radially displaced from a surface of the drive shaft.