Balloon expandable endoprosthesis
First Claim
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1. A medical device, comprising:
- a stent-graft defining a first free end, a second free end, and an intermediate portion between the first and second free ends, the stent-graft having an undeployed state with an undeployed diameter and an undeployed longitudinal length between the first free end and the second free end and a deployed state with a deployed diameter and a deployed longitudinal length between the first free end and the second free end, the stent-graft including a stent portion and a graft portion; and
a catheter assembly onto which the stent-graft is assembled in the undeployed state, the catheter assembly including,a balloon, anda cover including a middle portion situated between first and second end portions of the cover, the cover concentrically surrounding the balloon such that the first and second end portions of the cover impart a resistance to expansion of the balloon that exceeds a resistance to expansion imparted to the balloon by the middle portion of the cover, the stent-graft disposed about the cover and the balloon such that the intermediate portion of the stent-graft in combination with the cover imparts a resistance to expansion of the balloon at the intermediate portion of the stent-graft that exceeds the resistance imparted on the balloon by the first and second end portions of the cover, wherein a difference in an expansion rate of the balloon at the first and second free ends of the stent-graft is reduced relative to an expansion rate of the balloon at the intermediate portion of the stent-graft so as to reduce longitudinal compression of the stent-graft as the balloon expands the stent-graft from its undeployed state to its deployed state.
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Accused Products
Abstract
An improved medical device reduces the loss of longitudinal length during expansion of a stent-graft from a compressed state to an expanded state. For example, the stent-graft is placed over a cover that provides resistance to expansion of the balloon during inflation, which reduces longitudinal compressing forces exerted on the stent-graft.
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Citations
23 Claims
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1. A medical device, comprising:
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a stent-graft defining a first free end, a second free end, and an intermediate portion between the first and second free ends, the stent-graft having an undeployed state with an undeployed diameter and an undeployed longitudinal length between the first free end and the second free end and a deployed state with a deployed diameter and a deployed longitudinal length between the first free end and the second free end, the stent-graft including a stent portion and a graft portion; and a catheter assembly onto which the stent-graft is assembled in the undeployed state, the catheter assembly including, a balloon, and a cover including a middle portion situated between first and second end portions of the cover, the cover concentrically surrounding the balloon such that the first and second end portions of the cover impart a resistance to expansion of the balloon that exceeds a resistance to expansion imparted to the balloon by the middle portion of the cover, the stent-graft disposed about the cover and the balloon such that the intermediate portion of the stent-graft in combination with the cover imparts a resistance to expansion of the balloon at the intermediate portion of the stent-graft that exceeds the resistance imparted on the balloon by the first and second end portions of the cover, wherein a difference in an expansion rate of the balloon at the first and second free ends of the stent-graft is reduced relative to an expansion rate of the balloon at the intermediate portion of the stent-graft so as to reduce longitudinal compression of the stent-graft as the balloon expands the stent-graft from its undeployed state to its deployed state. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A medical device, comprising:
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a stent-graft defining a first free end, a second free end, and an intermediate portion between the first and second free ends, the stent-graft having an undeployed state with undeployed longitudinal length between the first free end and the second free end and a deployed state with a deployed longitudinal length between the first free end and the second free end, the stent-graft including, a stent portion, and a graft portion; and a catheter assembly onto which the stent-graft is assembled in the undeployed state, the catheter assembly including, a balloon, and a cover including a middle portion situated between first and second end portions of the cover, the cover concentrically surrounding the balloon such that the first and second end portions of the cover impart a resistance to expansion of the balloon that exceeds a resistance imparted to the balloon by the middle portion of the cover, the stent-graft disposed about the cover and the balloon such that the intermediate portion of the stent-graft in combination with the cover imparts a resistance to expansion of the balloon at the intermediate portion of the stent-graft that exceeds the resistance to expansion imparted to the balloon by the first and second end portions of the cover, wherein the deployed longitudinal length of the stent-graft is at least 85% of the undeployed longitudinal length of the stent-graft. - View Dependent Claims (8)
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9. A medical device comprising:
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a stent-graft including; an inner ePTFE graft element, an outer ePTFE graft element, and a multiplicity of ringed stent elements positioned between the inner ePTFE graft element and the outer ePTFE graft element, the stent-graft having an undeployed state with a undeployed diameter and a deployed state with a deployed diameter greater than the undeployed diameter; and a catheter assembly including a balloon concentrically surrounded by a cover, the cover including a middle portion situated between reinforcing portions, the reinforcing portions being configured to resist inflation of corresponding shoulder portions of the balloon, wherein the reinforcing portions of the cover impart a resistance to expansion of the corresponding shoulder portions of the balloon that exceeds a resistance to expansion imparted to the balloon by the middle portion of the cover, wherein the stent-graft is disposed about a portion of the cover such that a resistance to expansion of the balloon along the stent-graft exceeds the resistance to expansion of the corresponding shoulder portions imparted to the balloon by the reinforcing portions of the cover so as to reduce longitudinal compression of the stent-graft as the balloon expands the stent-graft from its undeployed state to its deployed state. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A medical device, comprising:
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a stent-graft having an undeployed state with an undeployed diameter and an undeployed length, and a deployed state with a deployed diameter and a deployed length, the stent-graft including; an inner graft element; an outer graft element; and a plurality of ringed stent elements positioned between and attached to the inner graft element and the outer graft element; and a catheter assembly including; a balloon having a cone-shaped end; a cover concentrically surrounding the balloon, the cover having a middle portion and a reinforcing portion, the reinforcing portion concentrically surrounding the cone-shaped end of the balloon, the reinforcing portion of the cover having a higher density than a density of the middle portion of the cover such that the reinforcing portion of the cover imparts a greater resistance to expansion of the cone-shaped end of the balloon relative to a resistance to expansion imparted to the balloon by the middle portion of the cover, wherein the stent-graft is disposed about a portion of the cover such that a resistance to expansion imparted to the balloon along the stent-graft exceeds the resistance to expansion imparted to the cone-shaped end of the balloon by the reinforcing portion of the cover in order to maintain an expansion profile that reduces longitudinal compression of the graft-stent. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification