Easily cleaned atherectomy catheters and methods of use
First Claim
Patent Images
1. An atherectomy catheter comprising:
- a body having an opening;
a rotatable shaft coupled to the body, the rotatable shaft being rotatable about a longitudinal axis of the shaft;
a tissue collection chamber coupled to the body and positioned distal to the cutting element; and
a cutting element coupled to the rotatable shaft, the cutting element having a cup-shaped surface and a cutting edge, the cup-shaped surface being configured to re-direct tissue cut by the cutting edge in a distal direction when the cup-shaped surface moves in the distal direction, wherein the tissue collection chamber has a first closed position capable of retaining cut tissue in the chamber and a second open position capable of allowing expulsion of cut tissue from the chamber,wherein the tissue collection chamber comprises an expandable tip at a distal region of the catheter, the expandable tip having a first closed position capable of retaining cut tissue in the chamber and a second open position capable of allowing expulsion of cut tissue from a distal opening at a distal end of the chamber, andwherein in the second open position, the cutting element is configured to extend distally through the distal opening to expel the cut tissue.
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Abstract
An atherectomy catheter is provided having a tissue collection chamber capable of being cleaned out in a simple, fast and effective way, and also provides methods of using said catheter to remove material from a blood vessel lumen. In one embodiment the tissue collection chamber has an expandable tip having a first closed position capable of retaining material in the chamber and having a second open position that may allow expulsion of material from the chamber. In a second embodiment the tissue collection chamber has a displaceable tip having a first closed position to retain material in the chamber and having a second open position to allow expulsion of material from the chamber.
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Citations
26 Claims
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1. An atherectomy catheter comprising:
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a body having an opening; a rotatable shaft coupled to the body, the rotatable shaft being rotatable about a longitudinal axis of the shaft; a tissue collection chamber coupled to the body and positioned distal to the cutting element; and a cutting element coupled to the rotatable shaft, the cutting element having a cup-shaped surface and a cutting edge, the cup-shaped surface being configured to re-direct tissue cut by the cutting edge in a distal direction when the cup-shaped surface moves in the distal direction, wherein the tissue collection chamber has a first closed position capable of retaining cut tissue in the chamber and a second open position capable of allowing expulsion of cut tissue from the chamber, wherein the tissue collection chamber comprises an expandable tip at a distal region of the catheter, the expandable tip having a first closed position capable of retaining cut tissue in the chamber and a second open position capable of allowing expulsion of cut tissue from a distal opening at a distal end of the chamber, and wherein in the second open position, the cutting element is configured to extend distally through the distal opening to expel the cut tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of removing tissue from a body lumen, the method comprising:
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providing an atherectomy catheter, the atherectomy catheter comprising; a body having an opening; a rotatable shaft coupled to the body, the rotatable shaft being rotatable about a longitudinal axis of the shaft; a tissue collection chamber coupled to the body and positioned distal to the cutting element; and a cutting element coupled to the rotatable shaft, the cutting element having a cup-shaped surface and a cutting edge, the cup-shaped surface being configured to re-direct tissue cut by the cutting edge in a distal direction when the cup-shaped surface moves in the distal direction, wherein the tissue collection chamber has a first closed position capable of retaining cut tissue in the chamber and a second open position capable of allowing expulsion of cut tissue from the chamber, and wherein the tissue collection chamber comprises an expandable tip at a distal region of the catheter, the expandable tip having a first closed position capable of retaining cut tissue in the chamber and a second open position capable of allowing expulsion of cut tissue from a distal opening at a distal end of the chamber; placing the catheter in the body lumen; moving the catheter in the body lumen to contact the cutting element with the tissue in the body lumen; cutting the tissue; collecting the cut tissue in the tissue collection chamber; expanding the expandable tip; and advancing the cutting element distally to expel the cut tissue through the distal opening. - View Dependent Claims (23, 24, 25, 26)
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Specification