Vascular endoprosthesis and method
First Claim
1. A device for treating stenosis, the device comprising:
- a catheter having a catheter body sized for insertion into a body vessel, a tubular liner of porous expanded fluoropolymer having a microstructure of nodes and fibrils having a negligible Poisson coupling, the liner having an original diameter sized for positioning through the catheter body to a desired location within the body vessel, and a radial expansion element positionable within the liner through the catheter body for enlarging the diameter of the liner without significantly changing the length of the liner.
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Accused Products
Abstract
A vascular endoprosthesis is formed of a tubular liner preform with a continuous surface and having a diameter smaller than that of an intended vessel. The liner is inserted to a treatment site, and its sheet material undergoes a radially-directed expansion to a final size that fits the vessel. Insertion and in situ expansion are achieved using a catheter assembly in which either an internal stent, such as a stiff-filament helically woven tube, or an inflatable balloon urge the liner preform outwardly against the inner wall of the vessel. The stent, or one or more simple internal snap-rings anchor the expanded liner in place. The expanded liner is porous, or becomes more porous during expansion, and one or more aspects of its porosity are tailored to the intended treatment goal of immobilizing treatment material, isolating cells, or permitting controlled permeation of selected materials.
231 Citations
26 Claims
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1. A device for treating stenosis, the device comprising:
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a catheter having a catheter body sized for insertion into a body vessel, a tubular liner of porous expanded fluoropolymer having a microstructure of nodes and fibrils having a negligible Poisson coupling, the liner having an original diameter sized for positioning through the catheter body to a desired location within the body vessel, and a radial expansion element positionable within the liner through the catheter body for enlarging the diameter of the liner without significantly changing the length of the liner. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for treating stenosis, the device comprising:
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a catheter having a catheter body sized for insertion into a body vessel, a tubular liner of porous expanded fluoropolymer having a microstructure of nodes and fibrils having a negligible Poisson coupling, and an original diameter less than the body vessel diameter and sized for positioning through the catheter body to a desired location within the body vessel, and a radial expansion element positionable within the liner through the catheter body, the radial expansion element deforming liner by expanding the liner to a diameter greater than the original diameter. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method of treating stenosis, the method comprising the steps of:
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inserting a tubular liner of porous expanded fluoropolymer to a desired location within a body vessel, the liner having a microstructure of nodes and fibrils, the nodes having a mass sufficient to provide the tube with negligible Poisson coupling, and radially expanding the liner without significantly changing the length of the liner. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A method of treating vascular stenosis, the method comprising the steps of:
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inserting a tubular liner of porous expanded fluoropolymer to a desired location with a body vessel, the liner having a microstructure of nodes and fibrils having a negligible Poisson coupling, and an original diameter less than the vessel diameter, and plastically deforming the liner by radially expanding the liner to a final diameter greater than the original diameter. - View Dependent Claims (23, 24, 25, 26)
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Specification