Device for cutting tissue
First Claim
Patent Images
1. An atherectomy catheter comprising:
- a rotatable shaft;
a cutting element coupled to the rotatable shaft and configured to rotate the cutting element about an axis of rotation, the cutting element havingan annular cutting edge,an interior surface radially inward of the annular cutting edge, anda raised element comprising first, second and third walls extending from the interior surface of the cutting element, wherein the first and third walls extend generally radially relative to the axis of rotation from adjacent the annular cutting edge toward the axis of rotation, wherein the second wall is radially inward of the first and third walls and extends between and connects the first and third walls, wherein the first wall curves toward the third wall from the second wall toward the annular cutting edge to direct cut particles of material toward the axis of rotation of the cutting element.
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Abstract
A catheter which includes a cutting element having one or more raised elements is provided. The cutting element has a cup-shaped surface at the distal end that may be smooth and continuous except for the raised elements. The raised elements have a surface that tends to direct cut particles of material towards one or more of the axis of rotation of the cutting element, the catheter axis, or a particle collection chamber. In further aspects of the invention, a cutting element oscillates in a direction roughly parallel to the axis of rotation of the cutting element.
615 Citations
17 Claims
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1. An atherectomy catheter comprising:
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a rotatable shaft; a cutting element coupled to the rotatable shaft and configured to rotate the cutting element about an axis of rotation, the cutting element having an annular cutting edge, an interior surface radially inward of the annular cutting edge, and a raised element comprising first, second and third walls extending from the interior surface of the cutting element, wherein the first and third walls extend generally radially relative to the axis of rotation from adjacent the annular cutting edge toward the axis of rotation, wherein the second wall is radially inward of the first and third walls and extends between and connects the first and third walls, wherein the first wall curves toward the third wall from the second wall toward the annular cutting edge to direct cut particles of material toward the axis of rotation of the cutting element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification