ROTATIONAL ATHERECTOMY DEVICE WITH A SYSTEM OF ECCENTRIC ABRADING HEADS

摘要

The invention provides a rotational atherectomy device having, in various embodiments, a flexible, elongated, rotatable drive shaft with a system of eccentric abrading heads attached thereto. At least part of the eccentric enlarged abrading heads in the system have a tissue removing surface—typically an abrasive surface. In certain embodiments, the abrading heads may be at least partially hollow. Preferably the eccentric enlarged abrading heads have centers of mass spaced radially from the rotational axis of the drive shaft, facilitating the ability of the system of eccentric abrading heads to work together to open the stenotic lesion to a diameter substantially larger than the outer resting diameter of the enlarged abrading heads when operated at high speeds. Therefore, certain embodiments comprise a system having unbalanced centers of mass to not only stimulate greater rotational diameters but also arranged in a manner whereby a debris-removing augering effect occurs. Alternatively, other embodiments may comprise systems having abrading heads with balanced centers of mass.

主权项

1. A high-speed rotational atherectomy device, comprising:
a guide wire; a flexible, elongated and rotatable drive shaft advanceable over the guide wire, the drive shaft having a rotational axis; an eccentric abrasive element disposed on the drive shaft and comprising a mass and a center of mass that is spaced a distance radially away from the rotational axis of the drive shaft in a direction along a longitudinal plane; an eccentric proximal abrasive counterweight disposed on the drive shaft and comprising a mass and a center of mass that is spaced a distance radially away from the rotational axis along the longitudinal plane and in the opposite direction as the eccentric abrasive element's center of mass spacing center of mass spaced radially away from the rotational axis along the longitudinal plane and in the opposite direction as the eccentric abrasive element's center of mass spacing, and the center of mass of the eccentric proximal abrasive counterweight is spaced a distance from the center of mass of the eccentric abrasive element; and an eccentric distal abrasive counterweight disposed on the drive shaft and having a mass and a center of mass spaced radially away from the rotational axis of the drive shaft along the longitudinal plane, and the center of mass of the eccentric distal abrasive counterweight is spaced a distance from the center of mass of the eccentric abrasive element.