STENT DELIVERY SYSTEM WITH IMPROVED RETRACTION MEMBER
First Claim
1. An expandable stent and stent delivery system comprising:
- a delivery system including an elongated core member having a distal portion and a retraction member disposed about the distal portion of said elongated core member;
said retraction member has a non-cylindrical transverse cross-sectional profile and at least one extending portion of the retraction member;
a self-expanding stent comprising a small diameter tubular member having a thin wall, at least one anchor member extending away from said thin wall, said extending portion of the retraction member being engageable with a distal portion of said anchor member when the stent is compressed onto said core member;
a deployment catheter having a lumen extending therethrough and adapted for coaxial placement about said elongated core member such that said deployment catheter compresses the stent tubular member onto said distal portion of the core member in a compressed condition having a compressed inner radius; and
said extending portion of the retraction member has a radius greater than said compressed inner radius of the stent tubular member.
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Accused Products
Abstract
An expandable stent and delivery system is provided for treating body vessel defects, such as partially occluded blood vessels and aneurysms. The delivery system includes a core member having a non-cylindrical retraction member with extending portions configured to extend between struts of the stent. The stent includes enlarged anchor members that cooperate with the retraction member to secure the stent to the core member for movement within a delivery catheter and deployment to a body vessel defect. The extending portions provide a greater contact area than would be possible with a cylindrical retraction member, which is especially beneficial when retracting a partially deployed stent into the catheter.
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Citations
20 Claims
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1. An expandable stent and stent delivery system comprising:
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a delivery system including an elongated core member having a distal portion and a retraction member disposed about the distal portion of said elongated core member;
said retraction member has a non-cylindrical transverse cross-sectional profile and at least one extending portion of the retraction member;
a self-expanding stent comprising a small diameter tubular member having a thin wall, at least one anchor member extending away from said thin wall, said extending portion of the retraction member being engageable with a distal portion of said anchor member when the stent is compressed onto said core member;
a deployment catheter having a lumen extending therethrough and adapted for coaxial placement about said elongated core member such that said deployment catheter compresses the stent tubular member onto said distal portion of the core member in a compressed condition having a compressed inner radius; and
said extending portion of the retraction member has a radius greater than said compressed inner radius of the stent tubular member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of deploying an expandable stent within a body vessel, the method comprising:
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providing a self-expanding stent and delivery system, wherein a thin wall of the stent is mounted about a distal portion of an elongated core member of the delivery system in a compressed condition having a compressed inner radius, the stent having an anchor member extending away from the thin wall, and wherein a distal portion of the anchor member is engageable with an extending portion of a non-cylindrical retraction member disposed at the distal portion of the elongated core member, the extending portion of the retraction member having a radius greater than the compressed inner radius of the thin wall, and the delivery system includes a deployment catheter disposed about the stent to compress same onto the distal portion of the core member;
inserting the stent and at least a portion of the delivery system into a body vessel;
positioning the stent adjacent to a defect of the body vessel;
moving the deployment catheter proximally with respect to the elongated core member, allowing the stent to begin expanding within the body vessel; and
further moving the deployment catheter proximally with respect to the elongated core member, allowing the stent to fully deploy. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of resheathing an expandable stent within a body vessel, the method comprising:
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providing a self-expanding stent and delivery system, wherein a thin wall of the stent is mounted about a distal portion of an elongated core member of the delivery system in a compressed condition having a compressed inner radius, the stent having an anchor member extending away from the thin wall, a distal portion of the anchor member being engageable with an extending portion of a non-cylindrical retraction member disposed at the distal portion of said elongated core member, the extending portion of the retraction member has a radius greater than the compressed inner radius of the thin wall, and the delivery system includes a deployment catheter disposed about the stent to compress same onto the distal portion of the core member;
inserting the stent and at least a portion of the delivery system into a body vessel;
positioning the stent adjacent to a defect of the body vessel;
moving the deployment catheter proximally with respect to the elongated core member, allowing the stent to begin expanding within the body vessel;
moving the deployment catheter distally with respect to the elongated core member, forcing the stent back into the deployment catheter; and
relocating the stent and the delivery system. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification