CUSTOM-LENGTH SELF-EXPANDING STENT DELIVERY SYSTEMS WITH STENT BUMPERS
First Claim
1. A catheter system for delivery of a stent to a body lumen comprising:
- a stent delivery catheter comprising;
a sheath having a first lumen;
a shaft extending through the first lumen and slidable relative to the sheath;
a stent bumper mounted to the shaft distally of the sheath and movable from a contracted shape to an expanded shape; and
a plurality of self-expanding stent segments carried within the first lumen in a collapsed configuration, the stent segments being adapted to resiliently expand from the collapsed configuration to an expanded configuration, and wherein the stent segments are deployable from the first lumen so as to resiliently expand into the expanded configuration, the stent bumper being expandable independently of the stent segments and configured in the expanded shape to engage a first stent segment during deployment thereof to maintain its position relative to an adjacent stent segment disposed proximal to the first stent segment, and wherein the sheath is disposed over the balloon and the sheath is retractable to expose a portion of the stent bumper to allow it to expand from the contracted shape to the expanded shape.
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Accused Products
Abstract
Custom-length self-expanding stent delivery systems and methods enable precise control of prosthesis position during deployment. The stent delivery systems carry multiple stent segments and include a stent bumper for helping control the axial position of the stent segments during deployment. This enables the deployment of multiple prostheses at a target site with precision and predictability, preventing stent segment recoil and ejection from the delivery device and thus eliminating excessive spacing or overlap between prostheses. In particular embodiments, the prostheses of the invention are deployed in stenotic lesions in coronary or peripheral arteries or in other vascular locations.
242 Citations
20 Claims
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1. A catheter system for delivery of a stent to a body lumen comprising:
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a stent delivery catheter comprising;
a sheath having a first lumen;
a shaft extending through the first lumen and slidable relative to the sheath;
a stent bumper mounted to the shaft distally of the sheath and movable from a contracted shape to an expanded shape; and
a plurality of self-expanding stent segments carried within the first lumen in a collapsed configuration, the stent segments being adapted to resiliently expand from the collapsed configuration to an expanded configuration, and wherein the stent segments are deployable from the first lumen so as to resiliently expand into the expanded configuration, the stent bumper being expandable independently of the stent segments and configured in the expanded shape to engage a first stent segment during deployment thereof to maintain its position relative to an adjacent stent segment disposed proximal to the first stent segment, and wherein the sheath is disposed over the balloon and the sheath is retractable to expose a portion of the stent bumper to allow it to expand from the contracted shape to the expanded shape. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of delivering a stent to a body lumen comprising:
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positioning a stent delivery catheter in the body lumen, the delivery catheter carrying at least first and second stent segments;
expanding a stent bumper on the delivery catheter;
releasing the first stent segment from the delivery catheter into the body lumen after the stent bumper has been fully expanded, the first stent segment resiliently self-expanding into an expanded configuration in the body lumen, wherein the stent bumper expands independently of the first stent segment and engages the first stent segment during expansion thereof to maintain its position relative to the delivery catheter;
before releasing the second stent segment, contracting the stent bumper;
positioning the contracted stent bumper within the expanded first stent segment;
re-expanding the stent bumper, wherein the stent bumper engages the second stent segment during expansion thereof to maintain its position relative to the delivery catheter and the first segment; and
releasing the second stent segment from the delivery catheter into the body lumen adjacent to the first stent segment, wherein the stent bumper maintains the position of each stent segment during deployment such that adjacent stent segments do not overlap and a spacing between adjacent stent segments is no more than about 1 mm after deployment. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification