Movement prevention stent

Abstract

The stent includes an expandable tubular body formed from one or more woven wires, and includes a plurality of anti-migration mechanisms each having a first end fixed to the tubular body and a second end extending radially outward from the outer surface of the tubular body. The anti-migration mechanism can be formed from a closed loop of one or more woven wires extending from the outer surface of the tubular body. The closed loop can be formed at the first end of the tubular body, at the second end of the tubular body, and / or along an intermediate region. In some cases, the base of the loop can be present at the intersection of the wires forming the closed loop. The wires can be welded at the intersection.

Claims

1. It is a stent, A tubular body formed from multiple interwoven wires, the tubular body having a first open end, a second open end on the opposite side, and a central longitudinal axis extending between the first and second open ends, the tubular body being movable between a radially compressed state and a radially expanded state, A plurality of anti-movement mechanisms, each anti-movement mechanism having a first end positioned on the outer surface of the tubular body and a second end extending radially outward from the outer surface of the tubular body, comprises: Each of the plurality of anti-movement mechanisms is defined by a closed loop formed from one of the plurality of interwoven wires, one end of each closed loop forms a base formed from one of the plurality of interwoven wires crossing it to form an intersection, the intersection located on the outer surface of the tubular body, a stent.

2. The stent according to claim 1, wherein one first segment of the plurality of woven wires and one second segment of the plurality of woven wires are welded to each other at the intersection.

3. The stent according to claim 1 or 2, wherein any tensile or compressive force applied to any of the plurality of movement prevention mechanisms does not reduce the outer diameter of the tubular body, nor does it extend or shorten the tubular body in the axial direction.

4. The stent according to claim 1 or 2, wherein the first portion of the plurality of movement prevention mechanisms is coupled to the tubular body adjacent to the first open end and extends toward the second open end at an acute angle with respect to the outer surface of the tubular body.

5. The stent according to claim 4, wherein the second portion of the plurality of movement prevention mechanisms is coupled to the tubular body adjacent to the second open end and extends at an acute angle toward the first open end.

6. The stent according to claim 1, wherein the first portion of the plurality of anti-movement mechanisms is coupled to the intermediate region of the tubular body and extends at an acute angle toward the first open end, and the second portion of the plurality of anti-movement mechanisms is coupled to the intermediate region of the tubular body and extends at an acute angle toward the second open end.

7. The stent according to claim 6, wherein the bases of each movement prevention mechanism of the first part and the bases of each movement prevention mechanism of the second part are spaced apart in the circumferential direction at a single longitudinal position along the tubular body.

8. The stent according to claim 1, wherein the plurality of closed loops forming the plurality of movement prevention mechanisms are arranged at the first open end and extend radially outward from the tubular body.

9. The stent according to claim 8, further comprising a plurality of elongated closed loops extending substantially parallel to the central longitudinal axis at the first open end.

10. The stent according to claim 9, wherein the plurality of elongated closed loops are inserted between adjacent closed loops among the plurality of closed loops forming the plurality of movement prevention mechanisms.

11. The stent according to claim 1 or 2, wherein each closed loop is formed by a plurality of woven wires, and the plurality of ends of the plurality of woven wires are welded to the periphery of the closed loop.

12. The stent according to claim 11, wherein each closed loop is formed by a portion of four interwoven wires that collectively form the periphery of the closed loop.

13. It is a stent, A tubular body formed from multiple interwoven wires, the tubular body having a first open end, a second open end on the opposite side, and a central longitudinal axis extending between the first and second open ends, the tubular body being movable between a radially compressed state and a radially expanded state, A stent comprising a plurality of anti-movement mechanisms, each of which defines a closed loop formed by one of the plurality of interwoven wires forming the tubular body, and each closed loop having a first end on the outer surface of the tubular body, the first end being formed by welding at the intersection of one of the plurality of interwoven wires forming the closed loop, and a second end of each closed loop extending radially outward from the outer surface of the tubular body.

14. It is a stent, A radially expandable tubular body formed from multiple interwoven wires, the tubular body having a first open end, a second open end on the opposite side, and a central longitudinal axis extending between the first and second open ends, the tubular body being movable between a radially compressed state and a radially expanded state, The present invention comprises a plurality of anti-movement mechanisms located at the first open end, each of which has a first end positioned on the outer surface of the tubular body and a second end extending radially outward from the outer surface of the tubular body. Each of the plurality of anti-movement mechanisms is formed by a plurality of wires arranged in a closed loop of the plurality of interwoven wires, the ends of the plurality of wires are located on the periphery of the closed loop, the first end of the closed loop is defined by an intersection where two of the plurality of wires forming the closed loop intersect each other, the intersection is located on the outer surface of the tubular body, A stent in which two of the aforementioned multiple wires are welded at the intersection.

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