Methods and devices for cutting and abrading tissue
First Claim
1. An atherectomy catheter, comprising:
- a rotatable shaft having proximal and distal ends and a longitudinal axis extending between the proximal and distal ends, wherein the rotatable shaft is selectively rotatable about its longitudinal axis; and
a tissue-removing element adjacent the distal end of the rotatable shaft, the tissue-removing element having a length and an outer diameter, the tissue-removing element being coupled to the rotatable shaft for rotating the tissue-removing element about a longitudinal axis of the tissue-removing element, the tissue-removing element havinga first abrasive surface on a first longitudinal portion of the outer diameter surface of the tissue-removing element configured for abrading tissue as the tissue-removing element rotates,a second abrasive surface on a second longitudinal portion of the outer diameter surface of the tissue-removing element configured for abrading tissue as the tissue-removing element rotates, anda non-abrasive surface on a third longitudinal portion of the outer surface of the tissue-removing element disposed longitudinally between the first and second abrasive surfaces;
wherein each of the first abrasive surface, the second abrasive surface, and the non-abrasive surface is annular and extends about the longitudinal axis.
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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
10 Claims
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1. An atherectomy catheter, comprising:
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a rotatable shaft having proximal and distal ends and a longitudinal axis extending between the proximal and distal ends, wherein the rotatable shaft is selectively rotatable about its longitudinal axis; and a tissue-removing element adjacent the distal end of the rotatable shaft, the tissue-removing element having a length and an outer diameter, the tissue-removing element being coupled to the rotatable shaft for rotating the tissue-removing element about a longitudinal axis of the tissue-removing element, the tissue-removing element having a first abrasive surface on a first longitudinal portion of the outer diameter surface of the tissue-removing element configured for abrading tissue as the tissue-removing element rotates, a second abrasive surface on a second longitudinal portion of the outer diameter surface of the tissue-removing element configured for abrading tissue as the tissue-removing element rotates, and a non-abrasive surface on a third longitudinal portion of the outer surface of the tissue-removing element disposed longitudinally between the first and second abrasive surfaces; wherein each of the first abrasive surface, the second abrasive surface, and the non-abrasive surface is annular and extends about the longitudinal axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification