Abstract: A catheter including an elongate drive shaft having a proximal end and a distal end, an ablation burr disposed at the distal end expandable between a first position and a second position, wherein in the second position has a greater transverse dimension than in the first position. The catheter of the present invention can include a mechanism for positioning the burr eccentrically within a vessel lumen. In this context, expansion means that the burr can ablate a lumen having a larger diameter than the diameter of the lumen of the guide catheter to which the device is advanced.

Abstract: A catheter including an elongate drive shaft having a proximal end and a distal end, an ablation burr disposed at the distal end expandable between a first position and a second position, wherein in the second position has a greater transverse dimension than in the first position. The catheter of the present invention can include a mechanism for positioning the burr eccentrically within a vessel lumen. In this context, expansion means that the burr can ablate a lumen having a larger diameter than the diameter of the lumen of the guide catheter to which the device is advanced.

Abstract: A catheter including an elongate drive shaft having a proximal end and a distal end, an ablation burr disposed at the distal end expandable between a first position and a second position, wherein in the second position has a greater transverse dimension than in the first position. The catheter of the present invention can include a mechanism for positioning the burr eccentrically within a vessel lumen. In this context, expansion means that the burr can ablate a lumen having a larger diameter than the diameter of the lumen of the guide catheter to which the device is advanced.

Abstract: A system for ablating material in vein grafts includes an ablation burr that is rotated by a driveshaft. The ablation burr preferably includes one or more channels, blades or other mechanisms that direct ablated material and liquid proximally and/or outwardly against a vessel wall. Aspiration is used to remove ablated material and liquid from the treatment area. Finally, methods for treating vein grafts and original native arteries are disclosed.

Abstract: An atherectomy burr has an operating diameter that is larger than the diameter of a catheter in which the burr is routed. The burr may include a polymeric balloon that is coated with an abrasive and that expands when the burr is rotated. Alternatively, the burr may include a polymeric tube that is coated with an abrasive and secured to the proximal end of the burr. When the burr is rotated, the polymeric tube expands by centrifugal force. Alternatively, the burr may comprise a metallic strip wound over a mandrel. When the strip is tightly coiled to the mandrel, its outer diameter decreases. The outer diameter of the burr increases as the metallic strip expands. In addition, the burr can be formed as a wire spring wound over a drive tube. The distal end of the spring is coupled to a nose cone that can move within a distal lumen in the drive tube. The maximum expansion of the burr is controlled by the distance that the nose cone can be retracted into the lumen.

Abstract: A catheter including an elongate drive shaft having a proximal end and a distal end, an ablation burr disposed at the distal end which can be drawn proximally to engage with a burr deflector surface of the drive shaft in order to be displaced transversely to remove plaque.

Abstract: An atherectomy burr has an operating diameter that is larger than the diameter of a catheter in which the burr is routed. The burr may include a polymeric balloon that is coated with an abrasive and that expands when the burr is rotated. Alternatively, the burr may include a polymeric tube that is coated with an abrasive and secured to the proximal end of the burr. When the burr is rotated, the polymeric tube expands by centrifugal force. Alternatively, the burr may comprise a metallic strip wound over a mandrel. When the strip is tightly coiled to the mandrel, its outer diameter decreases. The outer diameter of the burr increases as the metallic strip expands. In addition, the burr can be formed as a wire spring wound over a drive tube. The distal end of the spring is coupled to a nose cone that can move within a distal lumen in the drive tube. The maximum expansion of the burr is controlled by the distance that the nose cone can be retracted into the lumen.