Braided scaffolds
First Claim
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1. A self-expanding stent for treating a peripheral vessel, comprising:
- a segmented braided scaffold including a plurality of braided scaffold segments configured to be deployed end to end in a vessel, andat least three of the braided scaffold segments are hybrid segments, each of which comprising non-degradable filaments and degradable filaments woven to form a tubular configuration,wherein upon deployment of the scaffold from a collapsed state to a deployed state in a body cavity, the degradable filaments degrade and a radial strength or stiffness of the hybrid segments decreases with time,wherein when the degradable filaments are completely degraded, each hybrid segment comprises a residual stiffness provided by the non-degradable filaments, andwherein a hybrid proximal end segment a hybrid distal end segment of the scaffold have a higher radial strength or stiffness at deployment than a middle hybrid segment thereof, while having the same residual radial strength or stiffness as the middle hybrid segment, and wherein a first degradable polymer filament of the proximal and distal hybrid end segments has a higher degradation rate than a second degradable polymer filament of the middle hybrid segment so that a rate of decrease to the residual strength or stiffness is faster for the proximal and distal hybrid end segments than the middle hybrid segment.
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Abstract
A braided polymeric scaffold, made at least in part from a bioresorbable material is deployed on a catheter that uses a push-pull mechanism to deploy the scaffold. A drug coating is disposed on the scaffold. A plurality of scaffold segments on a catheter is also disclosed.
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Citations
11 Claims
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1. A self-expanding stent for treating a peripheral vessel, comprising:
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a segmented braided scaffold including a plurality of braided scaffold segments configured to be deployed end to end in a vessel, and at least three of the braided scaffold segments are hybrid segments, each of which comprising non-degradable filaments and degradable filaments woven to form a tubular configuration, wherein upon deployment of the scaffold from a collapsed state to a deployed state in a body cavity, the degradable filaments degrade and a radial strength or stiffness of the hybrid segments decreases with time, wherein when the degradable filaments are completely degraded, each hybrid segment comprises a residual stiffness provided by the non-degradable filaments, and wherein a hybrid proximal end segment a hybrid distal end segment of the scaffold have a higher radial strength or stiffness at deployment than a middle hybrid segment thereof, while having the same residual radial strength or stiffness as the middle hybrid segment, and wherein a first degradable polymer filament of the proximal and distal hybrid end segments has a higher degradation rate than a second degradable polymer filament of the middle hybrid segment so that a rate of decrease to the residual strength or stiffness is faster for the proximal and distal hybrid end segments than the middle hybrid segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification