Methods and devices for cutting and abrading tissue
First Claim
1. An atherectomy catheter, comprising:
- a body having opposite proximal and distal ends and a longitudinal axis, the body defining a lumen extending longitudinally therein and an opening in communication with the lumen;
a rotatable shaft extending longitudinally within the lumen and being rotatable relative to the body; and
a cutting element adjacent the opening having opposite proximal and distal ends, a length extending between the proximal and distal ends, and an outer, major diameter, the cutting element being coupled to the rotatable shaft for rotating the cutting element relative to the body about a longitudinal axis of the cutting element, the cutting element having a cutting edge configured for cutting tissue as the cutting element rotates and an abrasive surface spaced apart from the cutting edge on at least a longitudinal portion of an outer, major diameter surface of the cutting element configured for abrading tissue as the cutting element rotates,wherein the cutting element has a working position in which the cutting edge and the abrasive surface of the cutting element are exposed through the opening in the body to engage tissue outside the body of the atherectomy.
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Accused Products
Abstract
The present invention provides an atherectomy catheter which has a cutting element that is able to cut both soft tissue and hard tissue, and methods of cutting material from a blood vessel lumen using a rotating cutting element. The cutting element has a sharp cutting edge that surrounds a cup-shaped surface and at least one surface of abrasive material. The cup-shaped surface directs the cut material into a tissue chamber. The cutting edge and the cup-shaped surface together are well suited to cut and remove relatively soft tissue from the blood vessel. The abrasive material surface in combination with the cutting element is well suited to abrade and remove hard material from the blood vessel.
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Citations
20 Claims
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1. An atherectomy catheter, comprising:
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a body having opposite proximal and distal ends and a longitudinal axis, the body defining a lumen extending longitudinally therein and an opening in communication with the lumen; a rotatable shaft extending longitudinally within the lumen and being rotatable relative to the body; and a cutting element adjacent the opening having opposite proximal and distal ends, a length extending between the proximal and distal ends, and an outer, major diameter, the cutting element being coupled to the rotatable shaft for rotating the cutting element relative to the body about a longitudinal axis of the cutting element, the cutting element having a cutting edge configured for cutting tissue as the cutting element rotates and an abrasive surface spaced apart from the cutting edge on at least a longitudinal portion of an outer, major diameter surface of the cutting element configured for abrading tissue as the cutting element rotates, wherein the cutting element has a working position in which the cutting edge and the abrasive surface of the cutting element are exposed through the opening in the body to engage tissue outside the body of the atherectomy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of removing material from a body lumen, the method comprising:
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providing an atherectomy catheter, the atherectomy catheter comprising; a body having opposite proximal and distal ends and a longitudinal axis, the body defining a lumen extending longitudinally therein and an opening in communication with the lumen; a rotatable shaft extending longitudinally within the lumen and being rotatable relative to the body; and a cutting element adjacent the opening having opposite proximal and distal ends, a length extending between the proximal and distal ends, and an outer, major diameter, the cutting element being coupled to the rotatable shaft for rotating the cutting element relative to the body about a longitudinal axis of the cutting element, the cutting element having a cutting edge configured for cutting tissue as the cutting element rotates and an abrasive surface spaced apart from the cutting edge on at least a longitudinal portion of an outer, major diameter surface of the cutting element configured for abrading tissue as the cutting element rotates, wherein the cutting element has a working position in which the cutting edge and the abrasive surface of the cutting element are exposed through the opening in the body to engage tissue outside the body of the atherectomy catheter; placing the atherectomy catheter in the body lumen; and moving the atherectomy catheter in the body lumen, with the cutting element in the working position, to contact the cutting element with the material in the body lumen. - View Dependent Claims (17, 18, 19, 20)
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Specification