Expandable atherectomy burr and method of ablating an occlusion from a patient's blood vessel
First Claim
1. An atherectomy device for ablating an occlusion in a patient'"'"'s blood vessel, comprising:
- a drive shaft;
an ablation burr secured to the drive shaft, the burr including a polymeric balloon having an unexpanded state with a first diameter and an expanded state with a second larger diameter, the polymeric balloon further including an abrasive coating disposed on at least a portion of its exterior surface to ablate an occlusion in a patient'"'"'s vessel; and
a lumen extending through the drive shaft and ablation burr for receiving a guide wire.
2 Assignments
0 Petitions
Accused Products
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. In addition, the present invention includes a burr having an indexable outer diameter. Various indexing mechanisms are disclosed for selectively increasing or decreasing the distance between a proximal and distal end of the burr. As the length of the burr changes, the outer diameter of a number of cutting blades is changed to allow a physician to create different sized lumens in a patient'"'"'s vessel.
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Citations
25 Claims
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1. An atherectomy device for ablating an occlusion in a patient'"'"'s blood vessel, comprising:
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a drive shaft; an ablation burr secured to the drive shaft, the burr including a polymeric balloon having an unexpanded state with a first diameter and an expanded state with a second larger diameter, the polymeric balloon further including an abrasive coating disposed on at least a portion of its exterior surface to ablate an occlusion in a patient'"'"'s vessel; and a lumen extending through the drive shaft and ablation burr for receiving a guide wire. - View Dependent Claims (2, 3, 4, 5)
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6. An atherectomy device for ablating an occlusion in a patient'"'"'s blood vessel, comprising:
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a drive shaft; an ablation burr secured to the drive shaft, the burr including a nose section having a fixed maximum diameter and a polymeric section having an abrasive disposed on at least a portion thereof, the polymeric section having a diameter that increases as the burr is rotated by the drive shaft; and a lumen extending through the drive shaft and ablation burr for receiving a guide wire. - View Dependent Claims (7, 8, 9, 10, 11)
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12. An atherectomy device for ablating an occlusion in a patient'"'"'s blood vessel, comprising:
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a drive shaft; a mandrel coupled to the drive shaft; a compressible strip wound around the mandrel, the compressible strip including an abrasive disposed on at least a portion thereof for ablating an occlusion, the strip having a first diameter when the strip is tightly coiled around the mandrel and a second, larger diameter when not tightly coiled around the mandrel; and a lumen extending through the drive shaft and mandrel for receiving a guide wire. - View Dependent Claims (13, 14, 15)
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16. An atherectomy device for ablating an occlusion from a patient'"'"'s vessel, comprising:
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a drive shaft; an ablation burr coupled to the drive shaft that includes a number of cutting blades having an abrasive disposed thereon, the cutting blades including a first end coupled to a distal end of the burr and a second end coupled to a proximal end of the burr, the burr further including an indexing mechanism for selectively changing a maximum outer diameter of the burr, and a lumen extending through the drive shaft and ablation burr for receiving a guide wire. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A method of ablating an occlusion from a patient'"'"'s blood vessel, comprising:
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advancing a guide wire into a patient'"'"'s vasculature to the occlusion; advancing an atherectomy device over the guide wire, the ablation device having a drive shaft that includes; a polymeric section having a diameter that increases when rotated by the drive shaft; and an abrasive coating disposed on at least a portion of polymeric section; rotating the drive shaft to expand the diameter of the polymeric section; and advancing the atherectomy device into the occlusion to ablate it. - View Dependent Claims (25)
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Specification