Eccentric rotational atherectomy device
AssigneeShturman Cardiology Systems, Inc.
InventorsLeonid Shturman, Andrei Nevzorov
Life of this patent
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Abstract
A rotational atherectomy device having a flexible, elongated, rotatable drive shaft with an eccentric enlarged diameter section. At least part of the eccentric enlarged diameter section has a tissue removing surface. The eccentric enlarged diameter section of the drive shaft has a center of mass and/or geometric center spaced radially from the rotational axis of the drive shaft, facilitating the ability of the device to open the stenotic lesion to a diameter substantially larger than the outer diameter of the enlarged diameter section.
Claims106
A 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, and a flexible, elongated, rotatable drive shaft advanceable over the guide wire, the drive shaft having a rotational axis and an eccentric enlarged diameter section, at least part of the eccentric enlarged diameter section having a tissue removing surface to define a tissue removing segment of the drive shaft, the drive shaft, including its eccentric enlarged diameter section, being comprised of one or more helically wound wires.
A 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, and a flexible, elongated, rotatable drive shaft advanceable over the guide wire, the drive shaft having a rotational axis and a tissue removing section having a center of mass spaced radially from the rotational axis of the drive shaft, the drive shaft, including its tissue removing section, being comprised of one or more helically wound wires.
A 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, and a flexible, elongated, rotatable drive shaft advanceable over the guide wire, the drive shaft having an axis about which the drive shaft is rotated, the drive shaft including a tissue removing section having a shape such that a face of a transverse cross-section of the tissue removing section has a geometric center which is spaced radially away from the rotational axis of the drive shaft, the drive shaft, including its tissue removing section, being comprised of one or more helically wound wires.
A method of removing stenotic tissue from a stenotic lesion in an artery, comprising:
- providing a flexible, elongated, rotatable drive shaft having an eccentric enlarged diameter section with a nominal diameter, at least part of the eccentric enlarged diameter section having a tissue removing surface, the drive shaft, including its eccentric enlarged diameter section, being comprised of one or more helically wound wires, at least some adjacent wire turns of the eccentric enlarged diameter section being not secured with respect to each other, thereby permitting the eccentric enlarged diameter section to be deformed by centrifugal force;
- advancing the rotatable drive shaft over the guide wire to a location adjacent to the stenotic tissue;
- rotating the drive shaft at a speed sufficient to deform the eccentric enlarged diameter section by centrifugal force to a shape more eccentric than its at-rest shape;
- and
- while rotating the drive shaft at such speed, moving the eccentric enlarged diameter section across the stenotic lesion, thereby opening the stenotic lesion to a diameter larger than the nominal diameter of the eccentric enlarged diameter section.
Dependencies are inferred from the claim text.