Expandable covered stent with wide range of wrinkle-free deployed diameters
First Claim
1. A diametrically self-expanding stent-graft comprising:
- a self-expanding stent having an inside and an outside and provided with a graft covering attached to at least a portion of the stent, the graft covering applied to only one of the inside or outside of the stent, the graft comprising an ePTFE film possessing a density in a range of about 0.2 to about 0.6 g/cc, a matrix tensile strength in a range of about 70 to about 550 MPa in a longitudinal direction and in a range of about 15 to about 50 MPa in a transverse direction, and a Young'"'"'s modulus in a range of about 100 to about 500 MPa in the longitudinal direction and in a range of about 0.5 to about 20 MPa in the transverse direction, wherein the longitudinal direction of the ePTFE film is substantially aligned with a longitudinal axis of the self-expanding stent, wherein the ePTFE film is exceedingly distensible in the transverse direction;
wherein said stent-graft has a compacted diameter for insertion into a body conduit; and
wherein the stent-graft when unconstrained from the compacted diameter up to a fully self expanded deployed diameter of the stent, said graft being substantially wrinkle-free over diameters ranging from 50% to 100% of fully deployed diameter.
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Accused Products
Abstract
An improved stent-graft device is provided that delivers a smooth flow surface over a range of operative expanded diameters by applying a unique cover material to the stent through a technique that allows the cover to become wrinkle-free prior to reaching fully deployed diameter. The unique cover material then allows the device to continue to expand to a fully deployed diameter while maintaining a smooth and coherent flow surface throughout this additional expansion. Employed with a self-expanding device, when the device is unconstrained from a compacted diameter it will self-expand up to a fully deployed diameter with the graft being substantially wrinkle-free over diameters ranging from about 30-50% to 100% of the fully deployed diameter.
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Citations
28 Claims
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1. A diametrically self-expanding stent-graft comprising:
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a self-expanding stent having an inside and an outside and provided with a graft covering attached to at least a portion of the stent, the graft covering applied to only one of the inside or outside of the stent, the graft comprising an ePTFE film possessing a density in a range of about 0.2 to about 0.6 g/cc, a matrix tensile strength in a range of about 70 to about 550 MPa in a longitudinal direction and in a range of about 15 to about 50 MPa in a transverse direction, and a Young'"'"'s modulus in a range of about 100 to about 500 MPa in the longitudinal direction and in a range of about 0.5 to about 20 MPa in the transverse direction, wherein the longitudinal direction of the ePTFE film is substantially aligned with a longitudinal axis of the self-expanding stent, wherein the ePTFE film is exceedingly distensible in the transverse direction; wherein said stent-graft has a compacted diameter for insertion into a body conduit; and wherein the stent-graft when unconstrained from the compacted diameter up to a fully self expanded deployed diameter of the stent, said graft being substantially wrinkle-free over diameters ranging from 50% to 100% of fully deployed diameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18)
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12. A diametrically expandable stent-graft comprising:
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a self-expanding stent provided with a graft covering over at least a portion of the outer surface of the stent, the graft comprising an ePTFE film possessing a density in a range of about 0.2 to about 0.6 a/cc, a matrix tensile strength in a range of about 70 to about 550 MPa in a longitudinal direction and in a range of about 15 to about 50 MPa in a transverse direction and a Young'"'"'s modulus in a range of about 100 to about 500 MPa in the longitudinal direction and in a range of about 0.5 to about 20 MPa in the transverse direction, wherein the longitudinal direction of the ePTFE film is substantially aligned with a longitudinal axis of the self-expanding stent, wherein the ePTFE film is exceedingly distensible in the transverse direction, wherein said stent has a compacted diameter for insertion into a body conduit and self-expands following release from the compacted diameter to a fully deployed diameter of the stent, wherein said graft covering is substantially wrinkle-free over diameters ranging from 50% to 100% of the fully deployed diameter. - View Dependent Claims (19, 20, 21, 22, 23)
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13. A diametrically self-expanding stent-graft comprising:
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a self-expanding stent having an inside and an outside and provided with at least one graft covering attached to at least a portion of the stent, the graft comprising an ePTFE film possessing a density in a range of about 0.2 to about 0.6 q/cc, a matrix tensile strength in a range of about 70 to about 550 MPa in a longitudinal direction and in a range of about 15 to about 50 MPa in a transverse direction, and a Young'"'"'s modulus in a range of about 100 to about 500 MPa in the longitudinal direction and in a range of about 0.5 to about 20 MPa in the transverse direction, wherein the longitudinal direction of the ePTFE film is substantially aligned with a longitudinal axis of the self-expanding stent, wherein the ePTFE film is exceedingly distensible in the transverse direction, wherein said stent-graft has a compacted diameter for insertion into a body conduit; and wherein when the stent-graft fully self expands from the compacted diameter up to a fully deployed diameter of the stent, said graft covering is adapted to be substantially wrinkle-free over diameters ranging from 50% to 100% of the fully deployed diameter. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification