Devices and methods for removing obstructions from a cerebral vessel
First Claim
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1. A system for removing an obstruction, comprising:
- a microcatheter having an outer diameter of 0.025-0.060 inch along a distal portion, the distal portion having a length of at least 10 cm from a distal end of the lumen;
an obstruction engaging element having an expandable obstruction engaging portion, the obstruction engaging element being sized to be positioned in the lumen of the microcatheter, the obstruction engaging element having an outer diameter of less than 0.021 inch when positioned within the lumen of the microcatheter; and
a support catheter which is advanceable over the microcatheter, the support catheter having a distal portion having a lumen with a diameter of less than 0.065 inch and a length of at least 10 cm from a distal end.
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Abstract
The present invention is directed to methods and devices for removing an obstruction. The system includes a support catheter which can be advanced into small and tortuous vessels. By advancing the support catheter nearer to the obstruction then can be achieved with conventional guide catheters, the support catheter reduces the likelihood vessel compression and collapse when pulling on the retrieval element.
50 Citations
20 Claims
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1. A system for removing an obstruction, comprising:
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a microcatheter having an outer diameter of 0.025-0.060 inch along a distal portion, the distal portion having a length of at least 10 cm from a distal end of the lumen; an obstruction engaging element having an expandable obstruction engaging portion, the obstruction engaging element being sized to be positioned in the lumen of the microcatheter, the obstruction engaging element having an outer diameter of less than 0.021 inch when positioned within the lumen of the microcatheter; and a support catheter which is advanceable over the microcatheter, the support catheter having a distal portion having a lumen with a diameter of less than 0.065 inch and a length of at least 10 cm from a distal end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of removing an obstruction from a middle cerebral artery, comprising the steps of:
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providing an obstruction retriever, a microcatheter, a support catheter and a guide catheter, position a distal end of the guide catheter at a position proximal to the MCA; advancing the microcatheter through the guide catheter and into an obstruction; positioning the obstruction retriever within a lumen in the microcatheter; withdrawing the microcatheter thereby exposing a portion of the obstruction retriever, the exposed portion of the obstruction retriever being in contact with the obstruction; and advancing the support catheter over at least the retriever so that a distal end of the support catheter is positioned in the middle cerebral artery. - View Dependent Claims (10, 11, 12, 13)
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14. A system for removing an obstruction from a vascular location in the brain, comprising:
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a suction source; a guide catheter having a lumen coupled to the suction source; a microcatheter having a lumen, the microcatheter being sized to pass through the lumen of the guide catheter; an obstruction engaging element having an expandable obstruction engaging portion, the obstruction engaging element being sized to be positioned in the lumen of the microcatheter; and a support catheter which is advanceable over the obstruction engaging element. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification