Methods and devices for cutting tissue
First Claim
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1. An atherectomy catheter, comprising:
- a body having opposite proximal and distal ends;
a rotatable shaft coupled to the body;
a cutting element adjacent the distal end of the body and coupled to the rotatable shaft, such that the rotatable shaft is able to rotate the cutting element through a complete rotation about a longitudinal axis of the cutting element, the cutting element having opposite first and second longitudinal ends, a cutting edge extending circumferentially at the first longitudinal end of the cutting element, and an interior surface recessed longitudinally from the cutting edge; and
a raised element extending longitudinally outward from the interior surface of the cutting element toward the first longitudinal end of the cutting element, the raised element having a first side wall extending inward from the interior surface generally toward the longitudinal axis of the cutting element, and a longitudinal end wall defining a longitudinal end surface of the raised element which intersects the first side wall to form a first raised edge of the raised element, the first raised edge having inner and outer ends relative to the longitudinal axis of the cutting element,wherein the outer end of the first raised edge does not intersect the cutting edge and is spaced radially inward from the cutting edge relative to the longitudinal axis of the cutting element.
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Abstract
A catheter is provided, which includes a cutting element having one or more raised elements. The cutting element has a cup-shaped surface at the distal end that may be smooth and continuous except for the raised elements.
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Citations
20 Claims
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1. An atherectomy catheter, comprising:
- a body having opposite proximal and distal ends;
a rotatable shaft coupled to the body;a cutting element adjacent the distal end of the body and coupled to the rotatable shaft, such that the rotatable shaft is able to rotate the cutting element through a complete rotation about a longitudinal axis of the cutting element, the cutting element having opposite first and second longitudinal ends, a cutting edge extending circumferentially at the first longitudinal end of the cutting element, and an interior surface recessed longitudinally from the cutting edge; and a raised element extending longitudinally outward from the interior surface of the cutting element toward the first longitudinal end of the cutting element, the raised element having a first side wall extending inward from the interior surface generally toward the longitudinal axis of the cutting element, and a longitudinal end wall defining a longitudinal end surface of the raised element which intersects the first side wall to form a first raised edge of the raised element, the first raised edge having inner and outer ends relative to the longitudinal axis of the cutting element, wherein the outer end of the first raised edge does not intersect the cutting edge and is spaced radially inward from the cutting edge relative to the longitudinal axis of the cutting element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a body having opposite proximal and distal ends;
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11. An atherectomy catheter, comprising:
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a body having opposite proximal and distal ends; a rotatable shaft coupled to the body; a cutting element adjacent the distal end of the body and coupled to the rotatable shaft, such that the rotatable shaft is able to rotate the cutting element through a complete rotation about a longitudinal axis of the cutting element, the cutting element having opposite first and second longitudinal ends, a cutting edge extending circumferentially at the first longitudinal end of the cutting element, and an interior surface recessed longitudinally from the cutting edge; and a raised element extending longitudinally outward from the interior surface of the cutting element toward the first longitudinal end of the cutting element, the raised element having a first side wall extending inward from the interior surface generally toward the longitudinal axis of the cutting element, and a longitudinal end wall defining a longitudinal end surface of the raised element which intersects the first side wall to form a first raised edge of the raised element, the first raised edge having inner and outer ends relative to the longitudinal axis of the cutting element, wherein the outer end of the first raised edge does not intersect the cutting edge, wherein the longitudinal end surface of the raised element forms an acute angle with respect to the longitudinal axis of the cutting element. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification