Flexible self-expandable stent and method for making the same
First Claim
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1. A flexible self-expandable stent, comprising:
- a plurality of radially elastic cylindrical units, each of the radially elastic cylindrical units being in an opened zig-zag configuration having a series of straight sections joined by bends in a cylindrical shape, and one straight end section and another straight end section of each of the radially elastic cylindrical units being adjacent and in contact with each other to provide overlapping end sections; and
a cylindrical cover fixing member for sheathing and fixing the radially elastic cylindrical units;
wherein the radially elastic cylindrical units are fixed by and disposed on the cylindrical cover fixing member such that adjacent ends of each radially elastic cylindrical unit are spaced at predetermined intervals along the longitudinal axis of the cylindrical cover fixing member.
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Abstract
A flexible self-expandable stent comprises a plurality of radially cylindrical elastic units spaced at fixed intervals, a cylindrical cover fixing member which sheaths the cylindrical elastic units, and a reverse flow preventing valve. The reverse flow preventing valve is attached to the inner wall of the stent, for preventing food-stuffs or fluids from flowing from a downstream side to an upstream side. The flexible self-expandable stent exhibits improved flexibility so that when the stent is disposed in a curved lumina, it can flexibly correspond to the curvature of the lumina and prevent the reverse flow of foodstuffs or fluids by use of the reverse flow preventing valve.
1157 Citations
21 Claims
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1. A flexible self-expandable stent, comprising:
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a plurality of radially elastic cylindrical units, each of the radially elastic cylindrical units being in an opened zig-zag configuration having a series of straight sections joined by bends in a cylindrical shape, and one straight end section and another straight end section of each of the radially elastic cylindrical units being adjacent and in contact with each other to provide overlapping end sections; and a cylindrical cover fixing member for sheathing and fixing the radially elastic cylindrical units; wherein the radially elastic cylindrical units are fixed by and disposed on the cylindrical cover fixing member such that adjacent ends of each radially elastic cylindrical unit are spaced at predetermined intervals along the longitudinal axis of the cylindrical cover fixing member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A flexible self-expandable stent, comprising:
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a plurality of radially elastic cylindrical units, each of the radially elastic cylindrical units being in an opened zig-zag configuration having a series of straight sections joined by bends in a cylindrical shape, and one straight end section and another straight end section of each of the radially elastic cylindrical units being adjacent and in contact with each other to provide overlapping end sections; a cylindrical cover fixing member for sheathing and fixing the radially elastic cylindrical units; and a reverse flow preventing means for preventing foodstuffs or fluids from flowing from a downstream side to an upstream side, the reverse flow preventing means being attached to an inner wall of the cylindrical cover fixing member and forming an opening portion to allow gases to reversely escape therethrough, wherein the radially elastic cylindrical units are fixed by and disposed on the cylindrical cover fixing member such that adjacent ends of each radially elastic cylindrical unit are spaced at predetermined intervals along the longitudinal axis of the cylindrical cover fixing member. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification