Anti-slip stents

Abstract

To provide an anti-migration stent.SOLUTION: An anti-migration stent 1000 comprises: a first stent comprising a first cylindrical body 110 having a first space part, a first film part 120 which is formed spirally on an inner face of the first cylindrical body, and made of a PTFE material, and a second film part 130 which is formed on a whole outer face of the first cylindrical body, and made of a PTFE material caused to adhere to the first film part; and a second stent 200 comprising a second space secton, a second cylindrical body 210 having a length shorter than that of the first cylindrical body, and a diameter greater than that of the first cylindrical body, a connection part 220 formed by having a diameter decreasing at one side of the second cylindrical body, and a third film part made of a silicon material and formed on the second cylindrical body and the connection part. Therein after the second stent is externally fitted to one side of the first stent 100, the connection part is connected to one side of the first stent, and the second stent is held in a lumen.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an anti-slip stent that expands a stenosed or obstructed lesion in a body lumen while preventing slipping at the lesion when an external force is generated due to moving body fluids, pressure from food and drink, shaking of the human body, etc. [Background technology]

[0002] Generally, when a stenosis or obstruction occurs in an internal lumen of the body, such as the esophagus, duodenum, or bile duct, the inherent function of the internal lumen to move bodily fluids and food and drink is reduced. To address this problem, a stent is inserted at the location of the stenosis or obstruction to expand the narrowed internal lumen.

[0003] In this regard, Patent Document 1 provides a biliary stent in which one or more shape memory alloy wires are braided or crossed in a zigzag pattern to form a space, and a cylindrical body with multiple bent ends formed along the circumference at both ends is formed as a cylindrical stent, and the space or the entire cylindrical body is covered with silicone or PTFE, which is harmless to the human body, for the movement of bile. A medical thread is passed through the bent ends formed at the ends of the biliary stent and the end space formed together with the bent ends in sequence, and a bile discharge section having a diameter reduced by the moving bent parts as the bent ends narrow inward is provided, and only a portion of the space formed by the moving bent parts is coated with silicone or PTFE to block a portion of the space.

[0004] However, in the case of the above-mentioned Patent Document 1, there was a risk of slippage at the affected area when an external force was generated due to bodily fluids moving along the lumen, the pressure of food and drink, or the shaking of the human body. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Korean Patent No. 10-1996524 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, the present invention aims to provide an anti-slip stent with a structure different from conventional ones, which expands the site of a narrowed or obstructed lesion in an internal lumen of the body, prevents slipping at the lesion site when external forces are generated by moving body fluids, the pressure of food and drink, or the shaking of the human body, and which deforms to fit the curved shape of the internal lumen of the body, and which can be easily removed from the internal lumen of the body when a certain amount of time has passed since the completion of treatment at the lesion site. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a first stent for expanding a stenosis or occlusion occurring in a lumen of a body, the first stent being an anti-slip stent comprising a first cylindrical body having a plurality of first spaces formed between wires made of a superelastic shape memory alloy woven or crossed into a hollow cylindrical mesh structure, a first coating portion made of PTFE material formed in a spiral shape at predetermined intervals on the inner surface of the first cylindrical body, and a second coating portion made of PTFE material formed on the entire outer surface of the first cylindrical body and bonded to the first coating portion. The present invention provides an anti-slip stent comprising a second stent having a number of second spaces formed by being woven or crossed with wires made of an elastic shape memory alloy, the second stent being shorter than the first stent, fitted over and connected to one side of the first stent, and held in the lumen where a lesion has developed, the second stent comprising a second cylindrical body formed in a hollow cylinder shape and a connecting part formed by reducing the diameter of one side of the second cylindrical body and connected to the first stent, and a third coating part made of silicone material is formed on the second cylindrical body and the connecting part. Effect of the Invention

[0008] The present invention has the effect of preventing slippage at the lesion site when external forces such as moving bodily fluids, pressure from food and drink, or shaking of the human body occur by expanding the lesion site with a first stent and retaining a second stent protruding from the first stent in the lumen.

[0009] According to the present invention, since the second stent is formed with a third coating portion made of silicone material instead of PTFE, the third coating portion made of silicone material has a thinner thickness than the coating portion made of PTFE. As a result, when the second stent is removed after a certain time has elapsed since the treatment at the lesion site is completed, when the first stent is pulled out, the second stent is easily turned inside out due to the third coating portion made of silicone material which is thinner than PTFE, so that the anti-slip stent can be easily removed from the lumen of the body.

[0010] In the present invention, a first coating portion made of a PTFE material is formed in a spiral shape on the inner surface of a first cylindrical body, and a second coating portion made of a PTFE material is formed over the entire outer surface of the first cylindrical body and adhered to the first coating portion, thereby providing the effect that multiple portions of the first stent where the adhered first and second coating portions are not located become flexible.

[0011] In other words, the anti-slip stent has the effect of flexibly deforming to fit the curved lumen, and also has the effect of maintaining a curved and deformed state due to the first and second coating parts made of PTFE material that maintain an adhesive state.

[0012] In addition, the first coating portion and the second coating portion are adhered in a long spiral shape along the longitudinal direction of the first cylindrical body, which has the effect of providing wide support so that the anti-slip stent can maintain its bending, and the effect of the second coating portion formed on the entire outer surface of the first cylindrical body preventing the diseased area from growing into the inside of the first stent through the first space portion.

[0013] In the present invention, a first coating portion made of a PTFE material is formed over the entire inner surface of a first cylindrical body, and a second coating portion made of a PTFE material is formed in a spiral shape on the outer surface of the first cylindrical body and adhered to the first coating portion, thereby providing the effect that multiple portions of the first stent where the adhered first and second coating portions are not located become flexible, thereby providing the effect that the anti-slip stent can flexibly deform to fit the curved inner lumen.

[0014] In addition, the anti-slip stent has the effect of maintaining its bent and deformed state due to the first and second coating parts made of PTFE material that maintain their adhesive state. In addition, the first and second coating parts are adhered in a long spiral shape along the longitudinal direction of the first cylindrical body, which has the effect of providing wide support so that the anti-slip stent can maintain its bend.

[0015] In addition, the first space portion that is not closed by the first covering portion and the second covering portion has the effect of allowing the lesion site to be inserted and held therein.

[0016] In addition, there is an effect that the first coating portion formed on the entire inner surface of the first cylindrical body prevents the diseased area from growing inside the first stent through the first space portion.

[0017] In the present invention, the first and second coating portions made of PTFE material and bonded to each other are formed in the same spiral shape on the inner and outer surfaces of the first cylindrical body, which has the effect of forming fewer first and second coating portions on the first stent and the effect of making the multiple portions of the first stent where the bonded first and second coating portions are not located more flexible, resulting in the anti-slip stent of the present invention being able to deform more flexibly to fit a curved lumen.

[0018] In addition, the anti-slip stent has the effect of maintaining a bent and deformed state due to the first and second coating portions made of PTFE material that maintain an adhesive state.

[0019] In addition, since the first coating portion and the second coating portion are adhered in a long spiral shape along the longitudinal direction of the first cylindrical body, it has the effect of providing wide support so that the anti-slip stent can maintain its bending.

[0020] In addition, the first space portion that is not closed by the first covering portion and the second covering portion has the effect of allowing the lesion site to be inserted and held therein.

[0021] In the present invention, since first and second coating portions are not formed on the protrusions, the first space of the protrusions is inserted into and holds the lesion site and the lumen, thereby achieving the effect that both sides of the anti-slip stent of the present invention are held in the lumen by the second stent and the protrusions.

[0022] The present invention has the advantage that the manufacturing of the anti-slip stent of the present invention is simplified since the connecting portion of the second stent is integrally formed at one end of the first stent, eliminating the need to connect the first and second stents with a connecting thread.

[0023] In addition, since no connecting thread is used, there is an effect of preventing the connecting part from being broken by the connecting thread when the second stent is turned inside out. This has the effect of reducing the connection part of the second stent being held in the lumen when the anti-slip stent is removed, because the connecting portion of the connecting part does not protrude outside the first stent when turned inside out.

[0024] Since the present invention does not have a first coating portion and a second coating portion formed on one side of the first cylindrical body that overlaps with the connecting portion, the one side of the first cylindrical body becomes flexible. This has the effect that the one side of the first cylindrical body is stretched by an external force pulling the first stent and the volume is reduced, i.e., the anti-slip stent is retained less in the lumen and can be easily removed.

[0025] In addition, since the connection portion between one end of the first stent and the connecting portion is thin without the first and second coating portions, less of the connecting thread protrudes outside the second stent, which has the effect of reducing the retention of the connecting thread and the second stent in the outer tube of the stent delivery system when the anti-slip stent is mounted on the stent delivery system.

[0026] In other words, in addition to the effect that the anti-slip stent can be easily attached to a stent delivery system, since the first and second coating portions are not formed, the effect is that the task of suturing the first and second space portions of the first and second stents with connecting thread is simplified.

[0027] In the present invention, since a third coating portion is not formed at the connecting portion, the connecting portion becomes flexible. This has the effect of making it easy to remove the anti-slip stent of the present invention by allowing the connecting portion of the second stent to be easily deformed and easily turned inside out due to the external force used to pull out the first stent.

[0028] In addition, since the connection portion between one end of the first stent and the connecting portion is thin without the third coating portion being formed, less of the connecting thread protrudes outside the second stent, which has the effect of reducing the retention of the connecting thread and the second stent by the external tube of the stent delivery system when the anti-slip stent of the present invention is mounted on a stent delivery system.

[0029] In other words, the anti-slipping stent can be easily mounted on a stent delivery system.

[0030] Furthermore, since the third coating portion is not formed, there is an advantage that the operation of suturing the first and second spaces of the first and second stents with the connecting thread is simplified.

[0031] According to the present invention, the first and second coating parts are not formed on one side of the first cylindrical body overlapping the connecting part, and the third coating part is not formed on the connecting part, so that one side of the first cylindrical body and the connecting part become flexible, and thus, one side of the first cylindrical body is stretched by an external force pulling the first stent, thereby reducing its volume.

[0032] In other words, the anti-slip stent is less likely to be retained in the lumen and is more easily removed.

[0033] In addition, since the connecting portion of the second stent is easily deformed and turned inside out by the external force pulling the first stent, the anti-slip stent can be easily removed from the position where it was inserted in the lumen.

[0034] In addition, the connection portion between one end of the first stent and the connecting portion is thin because the first, second, and third coating portions are not formed, and therefore the connecting thread is reduced and protrudes outside the second stent. This has the effect of reducing the retention of the connecting thread and the second stent in the outer tube of the stent delivery system when the anti-slip stent is mounted on the stent delivery system.

[0035] In other words, the anti-slipping stent can be easily mounted on a stent delivery system.

[0036] Furthermore, since the first, second and third coating portions are not formed, there is an advantage that the operation of suturing the first and second spaces of the first and second stents with the connecting thread is simplified.

[0037] In the present invention, the first space on one side of the first cylindrical body overlapping the second stent is larger than the first space on the remaining part of the first cylindrical body not overlapping the second stent, and therefore the elasticity of the one side of the first cylindrical body overlapping the second stent is weakened, resulting in an effect that the one side of the first cylindrical body is stretched by an external force pulling the first stent, thereby reducing its volume.

[0038] In other words, the anti-slip stent is more easily retained in the lumen and can be more easily removed.

[0039] In the present invention, since the second space portion is larger than the first space portion, the elasticity of the second stent is weakened, and therefore the second stent is easily deformed and easily turned inside out by an external force pulling the first stent, which has the effect that the anti-slip stent of the present invention can be easily removed.

[0040] In the present invention, the first stent protrudes from the connecting part by a predetermined length and is connected by a connecting thread, which prevents one end of the first stent and one end of the connecting part from being held in the lumen at the same time, thereby having the effect of reducing irritation to the lumen.

[0041] It also has the advantage that it is less likely to be held against the outer tube when loaded into the stent delivery system. [Brief description of the drawings]

[0042] [Figure 1] 1A to 1C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a first embodiment of the present invention. [Diagram 2] 1A to 1C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a first embodiment of the present invention. [Diagram 3] 1A to 1C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a first embodiment of the present invention. [Figure 4] 1A to 1C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a first embodiment of the present invention. [Diagram 5] 1A to 1C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a first embodiment of the present invention. [Figure 6] 1A to 1C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a first embodiment of the present invention. [Figure 7] FIG. 2 is a diagram showing the state of use of the anti-slip stent according to the first embodiment of the present invention. [Figure 8] FIG. 2 is a diagram showing the state of use of the anti-slip stent according to the first embodiment of the present invention. [Figure 9] FIG. 2 is a diagram showing the state of use of the anti-slip stent according to the first embodiment of the present invention. [Figure 10] FIG. 2 is a diagram showing the state of use of the anti-slip stent according to the first embodiment of the present invention. [Figure 11] 1A and 1B are a front view and a view showing a state of use of an anti-slip stent according to a first modified example of the first embodiment of the present invention. [Figure 12] 1A and 1B are a front view and a view showing a state of use of an anti-slip stent according to a first modified example of the first embodiment of the present invention. [Figure 13] 1A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a second modified example of the first embodiment of the present invention. FIG. [Figure 14] 1A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a second modified example of the first embodiment of the present invention. FIG. [Figure 15] 1A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a second modified example of the first embodiment of the present invention. FIG. [Figure 16] 1A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a third modified example of the first embodiment of the present invention. FIG. [Figure 17] 1A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a third modified example of the first embodiment of the present invention. FIG. [Figure 18] 1A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a third modified example of the first embodiment of the present invention. FIG. [Figure 19] 1A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a fourth modified example of the first embodiment of the present invention. FIG. [Figure 20] 1A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a fourth modified example of the first embodiment of the present invention. FIG. [Figure 21] 1A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a fourth modified example of the first embodiment of the present invention. FIG. [Figure 22] 13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a fifth modified example of the first embodiment of the present invention. [Diagram 23] 13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a fifth modified example of the first embodiment of the present invention. [Figure 24] 13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a fifth modified example of the first embodiment of the present invention. [Diagram 25] 13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a fifth modified example of the first embodiment of the present invention. [Figure 26] FIG. 13 is a front view of an anti-slip stent according to a sixth modified example of the first embodiment of the present invention. [Figure 27] 5A to 5C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a second embodiment of the present invention. [Figure 28] 5A to 5C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a second embodiment of the present invention. [Figure 29] 5A to 5C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a second embodiment of the present invention. [Diagram 30] 5A to 5C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a second embodiment of the present invention. [Diagram 31] 5A to 5C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a second embodiment of the present invention. [Diagram 32] 5A to 5C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a second embodiment of the present invention. [Diagram 33] FIG. 4 is a diagram showing the state of use of the anti-slip stent according to the second embodiment of the present invention. [Diagram 34] FIG. 4 is a diagram showing the state of use of the anti-slip stent according to the second embodiment of the present invention. [Diagram 35] FIG. 4 is a diagram showing the state of use of the anti-slip stent according to the second embodiment of the present invention. [Diagram 36] FIG. 4 is a diagram showing the state of use of the anti-slip stent according to the second embodiment of the present invention. [Figure 37]FIG. 4 is a diagram showing the state of use of the anti-slip stent according to the second embodiment of the present invention. [Figure 38] 1A and 1B are a front view and a view showing a state of use of an anti-slip stent according to a first modified example of the second embodiment of the present invention. [Figure 39] 1A and 1B are a front view and a view showing a state of use of an anti-slip stent according to a first modified example of the second embodiment of the present invention. [Diagram 40] 1A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a second modified example of the second embodiment of the present invention. FIG. [Diagram 41] 1A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a second modified example of the second embodiment of the present invention. FIG. [Diagram 42] 1A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a second modified example of the second embodiment of the present invention. FIG. [Diagram 43] 13A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a third modified example of the second embodiment of the present invention. FIG. [Diagram 44] 13A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a third modified example of the second embodiment of the present invention. FIG. [Diagram 45] 13A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a third modified example of the second embodiment of the present invention. FIG. [Figure 46] 13A to 13C are a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a fourth modified example of the second embodiment of the present invention. [Figure 47] 13A to 13C are a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a fourth modified example of the second embodiment of the present invention. [Figure 48] 13A to 13C are a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a fourth modified example of the second embodiment of the present invention. [Figure 49] 13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a fifth modified example of the second embodiment of the present invention. [Figure 50] 13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a fifth modified example of the second embodiment of the present invention. [Figure 51] 13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a fifth modified example of the second embodiment of the present invention. [Figure 52] 13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a fifth modified example of the second embodiment of the present invention. [Figure 53] FIG. 13 is a front view of an anti-slip stent according to a sixth modified example of the second embodiment of the present invention. [Figure 54] 11A to 11C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a third embodiment of the present invention. [Figure 55] 11A to 11C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a third embodiment of the present invention. [Figure 56] 11A to 11C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a third embodiment of the present invention. [Figure 57] 11A to 11C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a third embodiment of the present invention. [Figure 58] 11A to 11C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a third embodiment of the present invention. [Figure 59] 11A to 11C are an exploded view, an assembled view, and a partially enlarged cross-sectional view of an anti-slip stent according to a third embodiment of the present invention. [Figure 60] FIG. 11 is a diagram showing the state of use of the anti-slip stent according to the third embodiment of the present invention. [Figure 61] FIG. 11 is a diagram showing the state of use of the anti-slip stent according to the third embodiment of the present invention. [Figure 62] FIG. 11 is a diagram showing the state of use of the anti-slip stent according to the third embodiment of the present invention. [Figure 63] FIG. 11 is a diagram showing the state of use of the anti-slip stent according to the third embodiment of the present invention. [Figure 64] FIG. 11 is a diagram showing the state of use of the anti-slip stent according to the third embodiment of the present invention. [Figure 65] 13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a first modified example of the third embodiment of the present invention. [Figure 66]13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a first modified example of the third embodiment of the present invention. [Figure 67] 13A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a second modified example of the third embodiment of the present invention. FIG. [Figure 68] 13A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a second modified example of the third embodiment of the present invention. FIG. [Figure 69] 13A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a second modified example of the third embodiment of the present invention. FIG. [Figure 70] 13A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a third modified example of the third embodiment of the present invention. FIG. [Figure 71] 13A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a third modified example of the third embodiment of the present invention. FIG. [Figure 72] 13A is a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a third modified example of the third embodiment of the present invention. FIG. [Figure 73] 13A to 13C are a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a fourth modified example of the third embodiment of the present invention. [Figure 74] 13A to 13C are a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a fourth modified example of the third embodiment of the present invention. [Figure 75] 13A to 13C are a front view, a partially enlarged cross-sectional view, and a view showing a state of use of an anti-slip stent according to a fourth modified example of the third embodiment of the present invention. [Figure 76] 13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a fifth modified example of the third embodiment of the present invention. [Figure 77] 13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a fifth modified example of the third embodiment of the present invention. [Figure 78] 13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a fifth modified example of the third embodiment of the present invention. [Figure 79]13A and 13B are a front view and a view showing a state of use of an anti-slip stent according to a fifth modified example of the third embodiment of the present invention. [Figure 80] FIG. 13 is a front view of an anti-slip stent according to a sixth modified example of the third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0043] Hereinafter, the above-mentioned embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0044] As shown in Figures 1 to 80, an anti-slip stent 1000 according to various embodiments and various modifications of the present invention is inserted into an internal cavity 1 of the human body, such as the esophagus, duodenum, or bile duct, using a stent delivery system such as a catheter, and is used to expand a stenosis or obstruction lesion site 1a that has occurred in the internal cavity 1.

[0045] As shown in Figures 1 to 10, the anti-slip stent 1000 according to the first embodiment of the present invention includes a first stent 100 and a second stent 200 fitted onto one side of the first stent 100 and connected to it by a connecting thread 300.

[0046] The first stent 100 includes a first cylindrical body 110 in which wires 2 made of a superelastic shape memory alloy are woven or crossed into a hollow cylindrical mesh structure, forming a number of first spaces 111 between the wires 2.

[0047] Here, the first stent 100 is heat-treated, and a woven portion where the wires 2 are woven and an intersection portion where the wires 2 cross are formed around the first space portion 111, and the first space portion 111 is formed into a shape similar to a diamond or the like.

[0048] The first stent 100 includes a first coating portion 120 made of PTFE (Polytetrafluoroethylene) formed in a spiral shape at a predetermined interval on the inner surface of the first cylindrical body 110, and a second coating portion 130 made of PTFE (Polytetrafluoroethylene) formed on the entire outer surface of the first cylindrical body 110 and adhered to the first coating portion 120.

[0049] Here, the first and second coating portions 120 and 130 are bonded to each other by applying heat and pressure, and a portion of the first spaces 111 is closed by the first and second coating portions 120 and 130 bonded to each other.

[0050] In other words, the first space 111 closed by the first and second coating portions 120, 130 is in a state in which it cannot be easily deformed by external forces, and since the first coating portion 120 is formed in a spiral shape on a portion of the inner surface of the first cylindrical body 110, a portion of the second coating portion 130 formed on the entire outer surface of the first cylindrical body 110 is not adhered to the first coating portion 120.

[0051] This is because a portion of the second coating portion 130 is free since there is no object to adhere to, and the remaining first space portion 111 that is not closed by the first and second coating portions 120 and 130 is in a state where it may be deformed by an external force.

[0052] In other words, various portions of the first cylindrical body 110 are made flexible by the free second coating portion 130, and the remaining portions of the first cylindrical body 110 are made inflexible by the first and second coating portions 120, 130 which remain adhered together.

[0053] Furthermore, the intervals formed in the first coating portion 120 may or may not be uniform.

[0054] The first stent 100 includes a protrusion 140 protruding from one side of a first cylindrical body 110 located opposite the second stent 200, and in this case, the protrusion 140 does not form the first and second coating portions 120 and 130, and does not close the first space portion 111 of the protrusion 140.

[0055] The second stent 200 includes a second cylindrical body 210 having a shorter length and a larger diameter than the first cylindrical body 110, and a connecting portion 220 formed by narrowing one side of the second cylindrical body 210, in which wires 2 made of a superelastic shape memory alloy are woven or crossed in a mesh structure to form a hollow cylinder, forming a plurality of second spaces 211 between the wires 2.

[0056] Here, the second stent 200 is heat-treated, and a braided portion where the wires 2 are braided and an intersection portion where the wires 2 are crossed are formed around the second space portion 211, and the second space portion 211 is formed in a shape similar to a diamond, etc., and the second stent 200 includes a third coating portion 230 made of a silicone material formed on the second cylindrical body 210 and the connecting portion 220.

[0057] The third coating portion 230 is formed by impregnating or spraying a silicone solution into the second spaces 211, so that the second spaces 211 are sealed with the third coating portion 230 made of silicone material.

[0058] The reason why the third coating portion 230 made of silicone material instead of PTFE is formed on the second stent 200 is that in the case of PTFE, a pair of PTFE films are positioned facing each other on the inner and outer surfaces of the second stent 200 and then bonded by heating and pressurization, so that a PTFE coating portion that is thicker than the third coating portion 230 made of silicone material is formed on the second stent 200.

[0059] As a result, when the first stent 100 of the anti-slip stent 1000 is pulled out and removed after a certain amount of time has passed since the treatment of the anti-slip stent 1000 at the lesion site 1a, there is a risk that the second stent 200 will be wound and overlapped in multiple layers due to the thickened PTFE coating portion, and there is a risk that the overlapping second stent 200 will become rigid and not be able to be turned over in the direction opposite to the direction in which the first stent 100 is pulled.

[0060] That is, the anti-slip stent 1000 does not come out of the lumen 1, and there is a risk that the lumen 1 may be damaged by the stiffened second stent 200.

[0061] However, in such a case, although there are the problems described above, when the anti-slip stent 1000 of the present invention tries to slip, the second stent 200 that is intended to prevent slippage moves downward, and as the second stent 200 is wound and overlaps in multiple layers, the radial force becomes stronger, so that it actually has the effect of preventing the anti-slip stent 1000 from slipping.

[0062] However, although there are such advantages, ultimately, there are problems as mentioned above when removing the anti-slip stent 1000. Therefore, in order to solve such problems, it is advantageous to form the third coating portion 230 of a silicone material rather than PTFE in the second stent 200 of the present invention, thereby making the third coating portion 230 thin.

[0063] In other words, in the second stent 200 of the present invention, the third coating part 230 is formed of a silicone material instead of PTFE, so that the thickness of the third coating part 230 is made thin.

[0064] The anti-slip stent 1000 is manufactured by fitting a second stent 200 onto one side of a first stent 100, and then sewing and connecting a first space portion 111 at one end of the first stent 100 and a second space portion 211 of a connecting portion 220 in a circumferential direction with a connecting thread 300.

[0065] Here, one end of the first stent 100 and one end of the connector 220 are positioned substantially on the same line.

[0066] Therefore, by inserting an anti-slip stent 1000 into a stenosis or obstruction lesion site 1a that has occurred in an internal cavity 1 of the body, for example, the esophagus, duodenum, bile duct, etc. of the human body, via a stent delivery system such as a catheter, as shown in Figure 7, the first stent 100 expands the lesion site 1a that has occurred in the internal cavity 1 of the body, and the second stent 200 is inserted and held in the lumen 1 where the lesion site 1a has occurred.

[0067] The second coating portion 130 formed on the entire outer surface of the first cylindrical body 110 prevents the lesion site 1a from being inserted into the first space portion 111, and of course, when the second stent 200 is positioned at the lesion site 1a, the third coating portion 230 prevents the lesion site 1a from being inserted into the second space portion 211.

[0068] As shown in FIG. 8, the protruding portion 140 is inserted into the first space 111 so that the lumen 1 and the lesion site 1a are held therein.

[0069] As shown in Figure 9, after a certain amount of time has passed since the anti-slip stent 1000 was applied to the stenosis or occlusion lesion site 1a in the internal lumen 1 of the body, it needs to be removed. At this time, the protrusion 140 of the first stent 100 of the anti-slip stent 1000 is pulled by a stent delivery system such as a catheter.

[0070] As a result of this action, since the second stent 200 is in close contact with the lumen 1, it is turned inside out in the opposite direction to the direction in which the first stent 100 is pulled, so that the second stent 200 is no longer held in the lumen 1, and the anti-slip stent 1000 of the present invention can easily slip out of the lumen 1.

[0071] As shown in FIG. 10, when the anti-slip stent 1000 is positioned in a curved lumen 1, the multiple portions of the first stent 100, which are flexible due to the free second coating portion 130, deform the first space portion 111, which means that the anti-slip stent 1000 can easily deform to fit the shape of the curved lumen 1.

[0072] At this time, the remaining part of the first stent 100, which has lost its flexibility due to the first and second coating parts 120, 130 maintaining their adhered state, does not easily deform the first space part 111. This means that the first space part 111 located in the free second coating part 130 maintains its deformed state due to the first space part 111 being located in the first and second coating parts 120, 130 maintaining their adhered state and not easily deforming unless an external force is transmitted to it, that is, the anti-slip stent 1000 maintains its bent and deformed state.

[0073] 11 and 12, the second stent 200 of the anti-slip stent 1000 according to the first modified example of the first embodiment of the present invention is connected to one end of the first stent 100 by integrally forming a connecting part 220 without a connecting thread 300, and there may be cases where the anti-slip stent 1000 needs to be removed after a certain time has passed since the application of the anti-slip stent 1000. At this time, when the first stent 100 of the first anti-slip stent 1000 is pulled, the second stent 200, which is in close contact with the lumen 1, is turned inside out in the direction opposite to the direction in which the first stent 100 is pulled and is no longer held in the lumen 1, and the anti-slip stent 1000 is removed from the lumen 1.

[0074] In addition, since the connecting portion 220 does not have the connecting thread 300, the connecting portion 220 does not have any bent portions due to the connecting thread 300.

[0075] That is, the connecting portion of the connector 220 connected to one end of the first stent 100 is turned inside out and does not protrude outside the first stent 100, so that the anti-slip stent 1000 of the present invention easily comes out of the lumen 1.

[0076] As shown in Figures 13 to 15, in the anti-slip stent 1000 according to the second modified example of the first embodiment of the present invention, one side of the first cylindrical body 110 overlapping with the connecting portion 220 does not have the first and second coating portions 120, 130 formed thereon.

[0077] That is, one side of the first cylindrical body 110 overlapping with the connecting portion 220 does not have the first and second coating portions 120 and 130 and is flexible.

[0078] In addition, the connection portion between one end of the first stent 100 and the connector 220 is configured to be thin without the first and second coating portions 120 and 130 being formed thereon.

[0079] In this configuration, the anti-slip stent 1000 needs to be removed after a certain time has passed since the application of the anti-slip stent 1000 to the lesion 1a. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200 is in close contact with the lumen 1 and is turned inside out in the opposite direction to the pulling direction of the first stent 100, and one side of the first cylindrical body 110, which is flexible and does not have the first and second coating parts 120 and 130, is easily deformed and stretched by the external force pulling the first stent 100, so the anti-slip stent 1000 of the present invention easily comes out of the lumen 1.

[0080] As shown in FIGS. 16 to 18, in the anti-slip stent 1000 according to the third modification of the first embodiment of the present invention, the connecting portion 220 does not have the third coating portion 230 formed thereon.

[0081] That is, the connecting portion 220 is flexible since the third coating portion 230 is not formed, and the connecting portion between one end of the first stent 100 and the connecting portion 220 is configured to be thin since the third coating portion 230 is not formed.

[0082] In this configuration, it is necessary to remove the anti-slip stent 1000 after a certain time has passed since the application of the anti-slip stent 1000 to the lesion site 1a. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200, which is in close contact with the lumen 1, is turned inside out in the opposite direction to the direction in which the first stent 100 is pulled.

[0083] Here, the second stent 200 is easily deformed and turned inside out by an external force pulling the first stent 100 due to the flexible connecting portion 220 without the third coating portion 230 formed thereon.

[0084] For this reason, the anti-slip stent 1000 of the present invention easily slips out of the lumen 1 .

[0085] As shown in Figures 19 to 21, in the anti-slip stent 1000 according to the fourth modified example of the first embodiment of the present invention, one side of the first cylindrical body 110 overlapping with the connecting portion 220 does not have the first and second coating portions 120, 130 formed, and the connecting portion 220 does not have the third coating portion 230 formed.

[0086] That is, one side of the first cylindrical body 110 overlapping with the connecting part 220 has flexibility since the first and second coating parts 120 and 130 are not formed, and the connecting part 220 has flexibility since the third coating part 230 is not formed.

[0087] In addition, the connection portion between one end of the first stent 100 and the connection portion 220 is configured to be thin without the first, second and third coating portions 120, 130 and 230 being formed.

[0088] In this configuration, it is necessary to remove the anti-slip stent 1000 after a certain time has passed since the application of the anti-slip stent 1000 to the lesion site 1a. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200, which is in close contact with the lumen 1, is turned inside out in the opposite direction to the direction in which the first stent 100 is pulled.

[0089] Here, the second stent 200 is easily deformed and turned inside out by an external force pulling the first stent 100 because the third coating portion 230 is not formed and the connecting portion 220 has flexibility.

[0090] Furthermore, one side of the first cylindrical body 110, which is flexible and does not have the first and second coating portions 120 and 130, is easily deformed and stretched by an external force pulling the first stent 100, so the anti-slip stent 1000 of the present invention can easily slip out of the lumen 1.

[0091] As shown in Figures 22 and 25, in the anti-slip stent 1000 according to the fifth modified example of the first embodiment of the present invention, the first space portion 111 on one side of the first cylindrical body 110 that overlaps with the second stent 200 is formed 2 to 4 times larger than the first space portion 111 in the remaining part of the first cylindrical body 110 that does not overlap with the second stent 200.

[0092] That is, the side of the first cylindrical body 110 overlapping with the second stent 200 has a lower elasticity than the remaining portion of the first cylindrical body 110 not overlapping with the second stent 200 .

[0093] In this configuration, the anti-slip stent 1000 needs to be removed after a certain time has passed since the application of the anti-slip stent 1000 to the lesion site 1a. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, one side of the first cylindrical body 110 overlapping the second stent 200 is easily deformed and stretched by the external force pulling the first stent 100 since it has weak elasticity.

[0094] Also, the second space portion 211 of the second stent 200 is formed to be 2 to 4 times larger than the first space portion 111 on one side of the first cylinder 110 that does not overlap with the second stent 200, so that the second stent 200 has weak elasticity.

[0095] With this configuration, after the anti-slip stent 1000 has been applied to the lesion site 1a, it needs to be removed after a certain period of time has passed. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200, having weak elasticity, is easily deformed and easily turned inside out by the external force pulling the first stent 100, and the anti-slip stent 1000 of the present invention easily comes out of the lumen 1.

[0096] As shown in Figure 26, the first stent 100 of the anti-slip stent 1000 according to the sixth modified example of the first embodiment of the present invention protrudes from the connecting portion 220 by a predetermined length L and is sewn and connected to the connecting portion 220 by a connecting thread 300.

[0097] Here, since the length L is 3 to 5 mm, one end of the first stent 100 and one end of the connecting portion 220 are not positioned on the same line.

[0098] As shown in Figures 27 and 37, the anti-slip stent 1000 according to the second embodiment of the present invention includes a first stent 100 and a second stent 200 fitted onto one side of the first stent 100 and connected by a connecting thread 300.

[0099] The first stent 100 includes a first cylindrical body 110 in which wires 2 made of a superelastic shape memory alloy are woven or crossed into a hollow cylindrical mesh structure, forming a number of first spaces 111 between the wires 2.

[0100] Here, the first stent 100 is heat-treated, and a woven portion where the wires 2 are woven and an intersection portion where the wires 2 cross are formed around the first space portion 111, and the first space portion 111 is formed into a shape similar to a diamond or the like.

[0101] The first stent 100 includes a first coating portion 120 made of PTFE (Polytetrafluoroethylene) formed on the entire inner surface of a first cylindrical body 110, and a second coating portion 130 made of PTFE (Polytetrafluoroethylene) formed in a spiral shape at a predetermined interval on the outer surface of the first cylindrical body 110 and adhered to the first coating portion 120.

[0102] Here, the first and second coating portions 120 and 130 are bonded to each other by applying heat and pressure, and a portion of the first spaces 111 is closed by the first and second coating portions 120 and 130 bonded to each other.

[0103] In other words, the first space 111 closed by the first and second coating portions 120, 130 is in a state in which it cannot be easily deformed by external forces, and since the second coating portion 130 is formed in a spiral shape on a portion of the outer surface of the first cylindrical body 110, the portion of the first coating portion 120 formed on the entire inner surface of the first cylindrical body 110 is not adhered to the second coating portion 130.

[0104] This is because a portion of the first coating portion 120 is free since there is no object to adhere to, and the remaining first space portion 111 that is not closed by the first and second coating portions 120 and 130 is in a state where it can be deformed by an external force.

[0105] In other words, portions of the first cylindrical body 110 are flexible due to the free first coating portion 120, and the remaining portions of the first cylindrical body 110 are inflexible due to the first and second coating portions 120, 130 that remain adhered.

[0106] Furthermore, the intervals formed in the second coating portion 130 may be either uniform or non-uniform.

[0107] The first stent 100 includes a protrusion 140 protruding from one side of a first cylindrical body 110 located opposite the second stent 200, and in this case, the protrusion 140 is configured so that the first and second coating portions 120 and 130 are not formed, and the first space portion 111 of the protrusion 140 is not closed.

[0108] The second stent 200 includes a second cylindrical body 210 having a shorter length and a larger diameter than the first cylindrical body 110, and a connecting portion 220 formed by narrowing one side of the second cylindrical body 210, in which wires 2 made of a superelastic shape memory alloy are woven or crossed into a hollow cylindrical mesh structure to form a number of second spaces 211 between the wires 2.

[0109] Here, the second stent 200 is heat-treated, and a braided portion where the wires 2 are braided and an intersection portion where the wires 2 are crossed are formed around the second space portion 211, and the second space portion 211 is formed in a shape similar to a diamond, etc., and the second stent 200 includes a third coating portion 230 made of a silicone material formed on the second cylindrical body 210 and the connecting portion 220.

[0110] The third coating portion 230 is formed by impregnating or spraying the second spaces 211 with a silicone solution, so that the second spaces 211 are closed with the third coating portion 230 made of silicone material.

[0111] The reason why the third coating portion 230 made of silicone material instead of PTFE is formed on the second stent 200 is that in the case of PTFE, a pair of PTFE films are positioned facing each other on the inner and outer surfaces of the second stent 200 and then bonded by heating and pressurization, so that a PTFE coating portion that is thicker than the third coating portion 230 made of silicone material is formed on the second stent 200.

[0112] As a result, after completion of treatment of the anti-slip stent 1000 at the lesion site 1a, when a certain amount of time has passed and the first stent 100 of the anti-slip stent 1000 is removed while being pulled, there is a risk that the second stent 200 will be wound and overlapped in multiple layers due to the thickened PTFE coating portion, and there is a risk that the overlapping second stent 200 will become rigid and not be able to be turned over in the direction opposite to the direction in which the first stent 100 is pulled.

[0113] That is, since the anti-slip stent 1000 cannot be pulled out from the lumen 1, there is a risk that the lumen 1 may be damaged by the stiffened second stent 200.

[0114] In order to solve this problem, the second stent 200 of the present invention is provided with a third coating part 230 made of silicone material instead of PTFE, so that the thickness of the third coating part 230 is reduced.

[0115] The anti-slip stent 1000 is manufactured by fitting a second stent 200 onto one side of a first stent 100, and then sewing and connecting a first space portion 111 at one end of the first stent 100 and a second space portion 211 of a connecting portion 220 in a circumferential direction with a connecting thread 300.

[0116] Here, one end of the first stent 100 and one end of the connector 220 are positioned substantially on the same line.

[0117] Therefore, by inserting an anti-slip stent 1000 into a lumen 1 inside the body, for example, a stenotic or obstructive lesion site 1a in the esophagus, duodenum, bile duct, etc. of the human body, via a stent delivery system such as a catheter, the first stent 100 expands the lesion site 1a in the lumen 1 inside the body, and the second stent 200 is inserted and held in the lumen 1 where the lesion site 1a has occurred, as shown in Figure 33.

[0118] As shown in FIG. 34, the first space 111 that is not closed by the bonded first and second coating parts 120, 130 has the diseased area 1a inserted and held therein, and the first coating part 120 formed on the entire inner surface of the first cylindrical body 110 prevents the diseased area 1a from being inserted into the inside of the first cylindrical body 110 through the first space 111.

[0119] Of course, when the second stent 200 is positioned at the lesion site 1 a, the third coating portion 230 prevents the lesion site 1 a from being inserted into the second space portion 211 .

[0120] As shown in FIG. 35, the protruding portion 140 is held by inserting the inner cavity 1 and the lesion site 1a into the first space 111.

[0121] 36, after the anti-slip stent 1000 is applied to the stenosis or obstruction lesion 1a in the body lumen 1, it must be removed after a certain period of time has passed. At this time, the protruding portion 140 of the first stent 100 of the anti-slip stent 1000 is pulled by a stent delivery system such as a catheter.

[0122] As a result of this action, since the second stent 200 is in close contact with the lumen 1, it is turned inside out in the direction opposite to the direction in which the first stent 100 is pulled, so that the second stent 200 is no longer held in the lumen 1, and the anti-slip stent 1000 of the present invention can easily slip out of the lumen 1.

[0123] As shown in Figure 37, when the anti-slip stent 1000 is positioned in a curved lumen 1, the first space portion 111 of multiple portions of the flexible first stent 100 is deformed due to the free first coating portion 120, which means that the anti-slip stent 1000 can easily deform to fit the shape of the curved lumen 1.

[0124] At this time, the remaining portion of the first stent 100, which has lost flexibility due to the first and second coating parts 120 and 130 maintaining an adhered state, does not easily deform the first space part 111. This means that the first space part 111 located in the free first coating part 120 maintains a deformed state due to the first space part 111 located in the first and second coating parts 120 and 130 maintaining an adhered state and not easily deformed unless an external force is transmitted, that is, the anti-slip stent 1000 maintains a bent and deformed state.

[0125] As shown in Figures 38 and 39, the second stent 200 of the anti-slip stent 1000 according to the first modified example of the second embodiment of the present invention is connected to one end of the first stent 100 by integrally forming a connecting part 220 without a connecting thread 300, and there may be cases where the anti-slip stent 1000 needs to be removed after a certain time has passed after the treatment. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200, which is in close contact with the lumen 1, is turned inside out in the direction opposite to the direction in which the first stent 100 is pulled and is no longer held in the lumen 1, and the anti-slip stent 1000 is removed from the lumen 1.

[0126] In addition, since the connecting portion 220 does not have the connecting thread 300, the connecting portion 220 does not have any bent portions due to the connecting thread 300.

[0127] That is, the connecting portion of the connector 220 connected to one end of the first stent 100 is turned inside out and does not protrude outside the first stent 100, so that the anti-slip stent 1000 of the present invention easily comes out of the lumen 1.

[0128] As shown in Figures 40 to 42, in the anti-slip stent 1000 according to the second modified example of the second embodiment of the present invention, one side of the first cylindrical body 110 overlapping with the connecting portion 220 does not have the first and second coating portions 120, 130 formed.

[0129] That is, one side of the first cylindrical body 110 overlapping with the connecting portion 220 does not have the first and second coating portions 120 and 130 and is flexible.

[0130] In addition, the connection portion between one end of the first stent 100 and the connection portion 220 is configured to be thin without the first and second coating portions 120 and 130 being formed.

[0131] In this configuration, the anti-slip stent 1000 needs to be removed after a certain time has passed since the application of the anti-slip stent 1000 to the lesion site 1a is completed. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200 is in close contact with the lumen 1 and is turned inside out in the opposite direction to the pulling direction of the first stent 100, and one side of the first cylindrical body 110, which is flexible and does not have the first and second coating parts 120 and 130, is easily deformed and stretched by the external force pulling the first stent 100, so the anti-slip stent 1000 of the present invention easily comes out of the lumen 1.

[0132] As shown in FIGS. 43 to 45, in the anti-slip stent 1000 according to the third modification of the second embodiment of the present invention, the connecting portion 220 does not have the third coated portion 230 formed thereon.

[0133] That is, the connecting portion 220 is flexible since the third coating portion 230 is not formed, and the connecting portion between one end of the first stent 100 and the connecting portion 220 is configured to be thin since the third coating portion 230 is not formed.

[0134] In this configuration, it is necessary to remove the anti-slip stent 1000 after a certain time has passed since the application of the anti-slip stent 1000 to the lesion site 1a. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200, which is in close contact with the lumen 1, is turned inside out in the direction opposite to the direction in which the first stent 100 is pulled.

[0135] Here, the second stent 200 is easily deformed and turned inside out by an external force pulling the first stent 100 because the third coating portion 230 is not formed and the connecting portion 220 has flexibility.

[0136] For this reason, the anti-slip stent 1000 of the present invention easily slips out of the lumen 1 .

[0137] As shown in Figures 46 to 48, in the anti-slip stent 1000 according to the fourth modified example of the second embodiment of the present invention, one side of the first cylindrical body 110 overlapping with the connecting portion 220 does not have the first and second coating portions 120, 130 formed, and the connecting portion 220 does not have the third coating portion 230 formed.

[0138] That is, one side of the first cylindrical body 110 overlapping with the connecting part 220 has flexibility since the first and second coating parts 120 and 130 are not formed, and the connecting part 220 has flexibility since the third coating part 230 is not formed.

[0139] In addition, the connection portion between one end of the first stent 100 and the connection portion 220 is configured to be thin without the first, second and third coating portions 120, 130 and 230 being formed.

[0140] In this configuration, it is necessary to remove the anti-slip stent 1000 after a certain time has passed since the application of the anti-slip stent 1000 to the lesion site 1a. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200, which is in close contact with the lumen 1, is turned inside out in the direction opposite to the direction in which the first stent 100 is pulled.

[0141] Here, the second stent 200 is easily deformed and turned inside out by an external force pulling the first stent 100 because the third coating portion 230 is not formed and the connecting portion 220 has flexibility.

[0142] Furthermore, one side of the first cylindrical body 110, which is flexible and does not have the first and second coating portions 120 and 130, is easily deformed and stretched by an external force pulling the first stent 100, so the anti-slip stent 1000 of the present invention can easily slip out of the lumen 1.

[0143] As shown in Figures 49 to 52, in the anti-slip stent 1000 according to the fifth modified example of the second embodiment of the present invention, the first space portion 111 on one side of the first cylindrical body 110 that overlaps with the second stent 200 is formed to be 2 to 4 times larger than the first space portion 111 in the remaining part of the first cylindrical body 110 that does not overlap with the second stent 200.

[0144] That is, the side of the first cylindrical body 110 overlapping with the second stent 200 has a lower elasticity than the remaining portion of the first cylindrical body 110 not overlapping with the second stent 200 .

[0145] In this configuration, the anti-slip stent 1000 needs to be removed after a certain time has passed since the application of the anti-slip stent 1000 to the lesion site 1a. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, one side of the first cylindrical body 110 overlapping with the second stent 200 is easily deformed and stretched by the external force pulling the first stent 100 since the first stent 100 has weak elasticity.

[0146] Also, the second space portion 211 of the second stent 200 is formed to be 2 to 4 times larger than the first space portion 111 on one side of the first cylindrical body 110 that does not overlap with the second stent 200, so that the second stent 200 has weak elasticity.

[0147] In this configuration, the anti-slip stent 1000 needs to be removed after a certain time has passed since the application of the anti-slip stent 1000 to the lesion site 1a. When the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200 is easily deformed and turned inside out by the external force pulling the first stent 100 because of its weak elasticity, and the anti-slip stent 1000 of the present invention easily comes out of the lumen 1.

[0148] As shown in Figure 53, the first stent 100 of the anti-slip stent 1000 according to the sixth modified example of the second embodiment of the present invention protrudes from the connecting portion 220 by a predetermined length L and is sewn and connected to the connecting portion 220 by a connecting thread 300.

[0149] Here, since the length L is 3 to 5 mm, one end of the first stent 100 and one end of the connecting portion 220 are not positioned on the same line.

[0150] As shown in Figures 54 to 64, the anti-slip stent 1000 according to the third embodiment of the present invention includes a first stent 100 and a second stent 200 fitted onto one side of the first stent 100 and connected by a connecting thread 300.

[0151] The first stent 100 includes a first cylindrical body 110 in which wires 2 made of a superelastic shape memory alloy are woven or crossed into a hollow cylindrical mesh structure, forming a number of first spaces 111 between the wires 2.

[0152] Here, the first stent 100 is heat-treated, and a woven portion where the wires 2 are woven and an intersection portion where the wires 2 cross are formed around the first space portion 111, and the first space portion 111 is formed into a shape similar to a diamond or the like.

[0153] The first stent 100 includes a first coating portion 120 made of PTFE (Polytetrafluoroethylene) formed in a spiral shape with a predetermined interval on the inner surface of the first cylindrical body 110, and a second coating portion 130 made of PTFE (Polytetrafluoroethylene) formed in the same spiral shape as the first coating portion 120 with a predetermined interval on the outer surface of the first cylindrical body and adhered to the first coating portion 120.

[0154] Here, the first and second coating portions 120 and 130 are bonded to each other by applying heat and pressure, and a portion of the first spaces 111 is closed by the first and second coating portions 120 and 130 bonded to each other.

[0155] In other words, the first space portion 111 closed by the first and second coating portions 120, 130 is in a state in which it cannot be easily deformed by external forces, and since the first and second coating portions 120, 130 are formed in a spiral shape on part of the inner and outer surfaces of the first cylindrical body 110, the first and second coating portions 120, 130 are not formed on the remaining parts of the inner and outer surfaces of the first cylindrical body 110.

[0156] For this reason, the remaining first space 111 that is not closed by the first and second coating portions 120 and 130 is in a state in which it can be deformed by an external force.

[0157] In other words, several portions of the first cylindrical body 110 are flexible because the first and second coating portions 120, 130 are not formed, and the remaining portions of the first cylindrical body 110 are inflexible due to the first and second coating portions 120, 130 maintaining an adhesive state.

[0158] The gaps formed in the first coating portion 120 may be constant or may not be constant. The gaps formed in the second coating portion 130 are formed in the same manner as the first coating portion 120.

[0159] The first stent 100 includes a protrusion 140 protruding from one side of a first cylindrical body 110 located opposite the second stent 200, and in this case, the protrusion 140 does not form the first and second coating portions 120 and 130, and does not close the first space portion 111 of the protrusion 140.

[0160] The second stent 200 includes a second cylindrical body 210 having a shorter length and a larger diameter than the first cylindrical body 110, and a connecting portion 220 formed by narrowing one side of the second cylindrical body 210, in which wires 2 made of a superelastic shape memory alloy are woven or crossed into a hollow cylindrical mesh structure to form a number of second spaces 211 between the wires 2.

[0161] Here, the second stent 200 is heat-treated, and a braided portion where the wires 2 are braided and an intersection portion where the wires 2 are crossed are formed around the second space portion 211, and the second space portion 211 is formed in a shape similar to a diamond, etc., and the second stent 200 includes a third coating portion 230 made of a silicone material formed on the second cylindrical body 210 and the connecting portion 220.

[0162] The third coating portion 230 is formed by impregnating or spraying the second spaces 211 with a silicone solution, so that the second spaces 211 are closed with the third coating portion 230 made of silicone material.

[0163] The reason why the third coating portion 230 made of silicone material instead of PTFE is formed on the second stent 200 is that in the case of PTFE, a pair of PTFE films are positioned facing each other on the inner and outer surfaces of the second stent 200 and then bonded by heating and pressurization, so that a PTFE coating portion that is thicker than the third coating portion 230 made of silicone material is formed on the second stent 200.

[0164] As a result, when a certain amount of time has passed since completion of the treatment of the anti-slip stent 1000 at the lesion site 1a, and the first stent 100 of the anti-slip stent 1000 is removed while being pulled, there is a risk that the second stent 200 will be wound and overlapped in multiple layers due to the thickened PTFE coating portion, and there is also a risk that the overlapping second stent 200 will stiffen and be turned inside out in the direction opposite to the direction in which the first stent 100 is pulled.

[0165] That is, the anti-slip stent 1000 cannot be pulled out from the lumen 1, and there is a risk that the lumen 1 may be damaged by the stiffened second stent 200.

[0166] In order to solve this problem, the second stent 200 of the present invention is provided with a third coating part 230 made of silicone material instead of PTFE, so that the thickness of the third coating part 230 is reduced.

[0167] The anti-slip stent 1000 is manufactured by fitting a second stent 200 onto one side of a first stent 100, and then sewing and connecting a first space portion 111 at one end of the first stent 100 and a second space portion 211 of a connecting portion 220 in a circumferential direction with a connecting thread 300.

[0168] Here, one end of the first stent 100 and one end of the connector 220 are positioned substantially on the same line.

[0169] Therefore, by inserting an anti-slip stent 1000 into a stenosis or obstruction lesion site 1a that has occurred in an internal lumen 1 of the body, for example, the esophagus, duodenum, bile duct, etc. of the human body, via a stent delivery system such as a catheter, the stent 100 expands the lesion site 1a that has occurred in the internal lumen 1 of the body, and the second stent 200 is inserted and held in the lumen 1 where the lesion site 1a has occurred, as shown in Figure 60.

[0170] As shown in FIG. 61, the first space 111 that is not closed by the bonded first and second covering portions 120, 130 has the diseased area 1a inserted therein and held therein.

[0171] Here, when the second stent 200 is positioned at the lesion site 1 a, the third coating portion 230 prevents the lesion site 1 a from being inserted into the second space portion 211 .

[0172] As shown in FIG. 62, the protruding portion 140 is held by inserting the inner cavity 1 and the lesion site 1a into the first space 111.

[0173] As shown in Fig. 63, after the application of the anti-slip stent 1000 to the stenosis or occlusion lesion 1a in the body lumen 1 is completed, it is necessary to remove it after a certain time has passed. At this time, the protruding portion 140 of the first stent 100 of the anti-slip stent 1000 is pulled by a stent delivery system such as a catheter.

[0174] As a result of this action, since the second stent 200 is in close contact with the lumen 1, it is turned inside out in the direction opposite to the direction in which the first stent 100 is pulled, so that the second stent 200 is no longer held in the lumen 1, and the anti-slip stent 1000 of the present invention can easily slip out of the lumen 1.

[0175] 64, when the anti-slip stent 1000 is placed in a curved lumen 1, the first space 111 of the first stent 100 having flexibility is deformed in multiple portions because the first and second coating portions 120, 130 are not formed. This means that the anti-slip stent 1000 can easily deform to fit the shape of the curved lumen 1.

[0176] At this time, the remaining portion of the first stent 100 that has lost flexibility due to the first and second coating parts 120 and 130 maintaining an adhered state does not easily deform the first space part 111. This means that the first space part 111 that is not located in the first and second coating parts 120 and 130 maintains a deformed state due to the first space part 111 that is located in the first and second coating parts 120 and 130 maintaining an adhered state and does not easily deform unless an external force is transmitted, and this means that the anti-slip stent 1000 maintains a bent and deformed state.

[0177] 65 and 66, the second stent 200 of the anti-slip stent 1000 according to the first modified example of the third embodiment of the present invention is connected to one end of the first stent 100 by integrally forming a connecting portion 220 without a connecting thread 300, and there may be cases where the anti-slip stent 1000 needs to be removed after a certain time has passed since the application of the anti-slip stent 1000. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200, which is in close contact with the lumen 1, is turned inside out in the direction opposite to the direction in which the first stent 100 is pulled and is no longer held in the lumen 1, and the anti-slip stent 1000 is removed from the lumen 1.

[0178] In addition, since the connecting portion 220 does not have the connecting thread 300, the connecting portion 220 does not have any bent portions due to the connecting thread 300.

[0179] That is, the connecting portion of the connector 220 connected to one end of the first stent 100 is turned inside out and does not protrude outside the first stent 100, so that the anti-slip stent 1000 of the present invention easily comes out of the lumen 1.

[0180] As shown in Figures 67 to 69, in the anti-slip stent 1000 according to the second modified example of the third embodiment of the present invention, one side of the first cylindrical body 110 overlapping with the connecting portion 220 does not have the first and second coating portions 120, 130 formed.

[0181] That is, one side of the first cylindrical body 110 overlapping with the connecting portion 220 does not have the first and second coating portions 120 and 130 and is flexible.

[0182] In addition, the connection portion between one end of the first stent 100 and the connection portion 220 is configured to be thin without the first and second coating portions 120 and 130 being formed.

[0183] In this configuration, the anti-slip stent 1000 needs to be removed after a certain time has passed since the application of the anti-slip stent 1000 to the lesion site 1a is completed. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200 is in close contact with the lumen 1 and is turned inside out in the opposite direction to the pulling direction of the first stent 100, and one side of the first cylindrical body 110, which is flexible and does not have the first and second coating parts 120 and 130, is easily deformed and stretched by the external force pulling the first stent 100, so the anti-slip stent 1000 of the present invention easily comes out of the lumen 1.

[0184] As shown in FIGS. 70 and 72, in the anti-slip stent 1000 according to the third modification of the third embodiment of the present invention, the connecting portion 220 does not have the third coated portion 230 formed thereon.

[0185] That is, the connecting portion 220 is flexible since the third coating portion 230 is not formed, and the connecting portion between one end of the first stent 100 and the connecting portion 220 is configured to be thin since the third coating portion 230 is not formed.

[0186] In this configuration, it is necessary to remove the anti-slip stent 1000 after a certain time has passed since the application of the anti-slip stent 1000 to the lesion site 1a. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200, which is in close contact with the lumen 1, is turned inside out in the direction opposite to the direction in which the first stent 100 is pulled.

[0187] Here, the second stent 200 is easily deformed and turned inside out by an external force pulling the first stent 100 because the third coating portion 230 is not formed and the connecting portion 220 has flexibility.

[0188] For this reason, the anti-slip stent 1000 of the present invention easily slips out of the lumen 1 .

[0189] As shown in Figures 73 to 75, in the anti-slip stent 1000 according to the fourth modified example of the third embodiment of the present invention, one side of the first cylindrical body 110 overlapping with the connecting portion 220 does not have the first and second coating portions 120, 130 formed, and the connecting portion 220 does not have the third coating portion 230 formed.

[0190] That is, one side of the first cylindrical body 110 overlapping with the connecting part 220 has flexibility since the first and second coating parts 120 and 130 are not formed, and the connecting part 220 has flexibility since the third coating part 230 is not formed.

[0191] In addition, the connection portion between one end of the first stent 100 and the connection portion 220 is configured to be thin without the first, second and third coating portions 120, 130 and 230 being formed.

[0192] In this configuration, it is necessary to remove the anti-slip stent 1000 after a certain time has passed since the application of the anti-slip stent 1000 to the lesion site 1a. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200, which is in close contact with the lumen 1, is turned inside out in the direction opposite to the direction in which the first stent 100 is pulled.

[0193] Here, the second stent 200 is easily deformed and turned inside out by an external force pulling the first stent 100 because the third coating portion 230 is not formed and the connecting portion 220 has flexibility.

[0194] One side of the first cylindrical body 110, which is flexible and does not have the first and second coating portions 120 and 130, is easily deformed and stretched by an external force pulling the first stent 100, so the anti-slip stent 1000 of the present invention can easily slip out of the lumen 1.

[0195] As shown in Figures 76 to 79, in the anti-slip stent 1000 according to the fifth modified example of the third embodiment of the present invention, the first space portion 111 on one side of the first cylindrical body 110 that overlaps with the second stent 200 is formed to be 2 to 4 times larger than the first space portion 111 in the remaining part of the first cylindrical body 110 that does not overlap with the second stent 200.

[0196] That is, the side of the first cylindrical body 110 overlapping with the second stent 200 has a lower elasticity than the remaining portion of the first cylindrical body 110 not overlapping with the second stent 200 .

[0197] In this configuration, the anti-slip stent 1000 needs to be removed after a certain time has passed since the application of the anti-slip stent 1000 to the lesion site 1a. At this time, when the first stent 100 of the anti-slip stent 1000 is pulled, one side of the first cylindrical body 110 overlapping with the second stent 200 is easily deformed and stretched by the external force pulling the first stent 100 since the first stent 100 has weak elasticity.

[0198] The second space portion 211 of the second stent 200 is formed to be 2 to 4 times larger than the first space portion 111 on one side of the first cylindrical body 110 that does not overlap with the second stent 200, so that the second stent 200 has weak elasticity.

[0199] In this configuration, the anti-slip stent 1000 needs to be removed after a certain time has passed since the application of the anti-slip stent 1000 to the lesion site 1a. When the first stent 100 of the anti-slip stent 1000 is pulled, the second stent 200 is easily deformed and turned inside out by the external force pulling the first stent 100 because of its weak elasticity, and the anti-slip stent 1000 of the present invention easily comes out of the lumen 1.

[0200] As shown in Figure 80, the first stent 100 of the anti-slip stent 1000 according to the sixth modified example of the third embodiment of the present invention protrudes from the connecting portion 220 by a predetermined length L and is sewn and connected to the connecting portion 220 by a connecting thread 300.

[0201] Here, since the length L is 3 to 5 mm, one end of the first stent 100 and one end of the connecting portion 220 are not positioned on the same line.

[0202] Furthermore, when the second stent 200 of the anti-slip stent 1000 according to various embodiments and modified examples of the present invention receives an external force from any one direction horizontally within the lumen 1, it tilts in the opposite direction to the direction in which the external force was received, centered on the first stent 100.

[0203] That is, the second stent 200 is held in strong adhesion to the lumen 1 while tilting and moving due to an external force, so that the anti-slip stent 1000 is prevented from slipping at the lesion site 1a.

[0204] Furthermore, when external forces are transmitted from both directions horizontally within the lumen 1, the second stent 200 protrudes in two directions intersecting the two directions in which the external forces are transmitted, with the first stent 100 as the center.

[0205] That is, the second stent 200 is held in strong adhesion to the lumen 1 while being protruded by an external force, so that the anti-slip stent 1000 is prevented from slipping at the lesion site 1a.

[0206] Although the present invention has been illustrated and described above by way of examples of specific preferred embodiments, the present invention is not limited to the above-described embodiments, and various changes and modifications may be made by those having ordinary skill in the art to which the invention pertains without departing from the spirit of the present invention. [Explanation of symbols]

[0207] 100 First stent 110 First cylindrical body 111 First space 120 1st coating part 130 Second coating part 140 Protrusion 200 Second stent 210 Second cylindrical body 211 Second space 220 Connection section 230 Third coating part 300 Connecting Thread 1000 Anti-slip stents

Claims

1. A first stent for expanding a stenosis or occlusion lesion site occurring in a lumen in a body, The first stent includes a first cylindrical body having a plurality of first spaces formed between wires made of a superelastic shape memory alloy braided or crossed in a hollow cylindrical mesh structure; A non-slip stent comprising a first coating portion made of PTFE (polytetrafluoroethylene) formed in a spiral shape at a predetermined interval on the inner surface of the first cylindrical body, and a second coating portion made of PTFE (polytetrafluoroethylene) formed on the entire outer surface of the first cylindrical body and bonded to the first coating portion, The wire is made of a superelastic shape memory alloy, and is woven or crossed to form a net shape, so that the wire has a number of second spaces, the second stent is shorter in length than the first stent, is fitted over one side of the first stent, and is connected to the first stent and is held in the lumen where the lesion has occurred. The second stent includes a second cylindrical body formed in a hollow cylindrical shape, and a connecting part formed by reducing the diameter of one side of the second cylindrical body and connected to the first stent, a third coating portion made of a silicone material is formed on the second cylindrical body and the connecting portion; A protrusion is provided on one side of the first cylindrical body opposite to the second stent, An anti-slip stent, characterized in that the protrusions are not formed with a first coating portion and a second coating portion.

2. The anti-slip stent according to claim 1 , wherein the first space at one end of the first stent and the second space at the connecting portion are connected by sewing with a connecting thread.

3. The anti-slip stent according to claim 1 , wherein one end of the first stent and the connecting portion are integrally formed and connected to each other.

4. The anti-slip stent according to claim 1 , wherein the first and second coating portions are not formed on one side of the first cylindrical body overlapping the connecting portion.

5. The anti-slip stent according to claim 1 , wherein the third coating portion is not formed on the connecting portion.

6. a first coating portion and a second coating portion are not formed on one side of the first cylindrical body overlapping the connecting portion, The anti-slip stent according to claim 1 , wherein the third coating portion is not formed on the connecting portion.

7. The anti-slip stent according to claim 1, wherein a first space portion on one side of the first cylindrical body overlapping with the second stent is larger than a first space portion on the remaining part of the first cylindrical body not overlapping with the second stent.

8. The anti-slip stent according to claim 1 , wherein the second space portion is larger than the first space portion.

9. The anti-slip stent according to claim 1 , wherein the first stent is connected to the connecting portion by protruding from the connecting portion by a predetermined length.

10. A first stent for expanding a stenosis or occlusion lesion site occurring in a lumen in a body, The first stent includes a first cylindrical body having a plurality of first spaces formed between wires made of a superelastic shape memory alloy braided or crossed in a hollow cylindrical mesh structure; A first coating portion made of PTFE (Polytetrafluoroethylene) formed on the entire inner surface of the first cylindrical body; The anti-slip stent includes a first coating portion and a second coating portion made of PTFE (Polytetrafluoroethylene) formed in a spiral shape at a predetermined interval on the outer surface of the first cylindrical body and bonded to the first coating portion, The wires are made of a superelastic shape memory alloy, and are woven or crossed to form a number of second spaces. The second stent is shorter than the first stent, and is fitted and connected to one side of the first stent and held in the lumen where the lesion has occurred. The second stent includes a second cylindrical body formed in a hollow cylindrical shape, and a connecting part formed by reducing the diameter of one side of the second cylindrical body and connected to the first stent, a third coating portion made of a silicone material is formed on the second cylindrical body and the connecting portion; A protrusion is provided on one side of the first cylindrical body opposite to the second stent, An anti-slip stent, characterized in that the protrusions are not formed with a first coating portion and a second coating portion.

11. The anti-slip stent according to claim 10, wherein the first space at one end of the first stent and the second space at the connecting portion are connected by sewing with a connecting thread.

12. The anti-slip stent according to claim 10, wherein one end of the first stent and the connecting portion are integrally formed and connected to each other.

13. The anti-slip stent according to claim 10, wherein the first and second coating portions are not formed on one side of the first cylindrical body overlapping the connecting portion.

14. The anti-slipping stent according to claim 10, wherein the third coating portion is not formed on the connecting portion.

15. a first coating portion and a second coating portion are not formed on one side of the first cylindrical body overlapping the connecting portion, The anti-slipping stent according to claim 10, wherein the third coating portion is not formed on the connecting portion.

16. The anti-slip stent according to claim 10, wherein a first space portion of one side of the first cylindrical body overlapping the second stent is larger than a first space portion of the remaining portion of the first cylindrical body not overlapping the second stent.

17. The anti-slipping stent according to claim 10, wherein the second space portion is larger than the first space portion.

18. The anti-slipping stent according to claim 10, wherein the first stent is connected to the connecting portion by protruding from the connecting portion by a predetermined length.

19. A first stent for expanding a stenosis or occlusion lesion site occurring in a lumen in a body, The first stent includes a first cylindrical body having a plurality of first spaces formed between wires made of a superelastic shape memory alloy braided or crossed in a hollow cylindrical mesh structure; a first coating portion made of PTFE (Polytetrafluoroethylene) formed in a spiral shape at a predetermined interval on the inner surface of the first cylindrical body; A non-slip stent comprising a second coating part made of PTFE (Polytetrafluoroethylene) material, the second coating part being formed in the same spiral shape as the first coating part at a predetermined interval on the outer surface of the first cylindrical body and being bonded to the first coating part, The wires are made of a superelastic shape memory alloy, and are woven or crossed to form a number of second spaces. The second stent is shorter than the first stent, and is fitted and connected to one side of the first stent and held in the lumen where the lesion has occurred. The second stent includes a second cylindrical body formed in a hollow cylindrical shape, and a connecting part formed by reducing the diameter of one side of the second cylindrical body and connected to the first stent, a third coating portion made of a silicone material is formed on the second cylindrical body and the connecting portion; A protrusion is provided on one side of the first cylindrical body opposite to the second stent, An anti-slip stent, characterized in that the protrusions are not formed with a first coating portion and a second coating portion.

20. The anti-slip stent according to claim 19, wherein the first space at one end of the first stent and the second space at the connecting portion are connected by sewing with a connecting thread.

21. The anti-slip stent according to claim 19, wherein one end of the first stent and the connecting portion are integrally formed and connected to each other.

22. The anti-slip stent according to claim 19, wherein the first and second coating portions are not formed on one side of the first cylindrical body overlapping the connecting portion.

23. The anti-slipping stent according to claim 19, wherein the third coating portion is not formed on the connecting portion.

24. a first coating portion and a second coating portion are not formed on one side of the first cylindrical body overlapping the connecting portion, The anti-slipping stent according to claim 19, wherein the third coating portion is not formed on the connecting portion.

25. The anti-slip stent according to claim 19, wherein a first space portion of one side of the first cylindrical body overlapping the second stent is larger than a first space portion of the remaining part of the first cylindrical body not overlapping the second stent.

26. The anti-slipping stent according to claim 19, wherein the second space portion is larger in size than the first space portion.

27. The anti-slipping stent according to claim 19, wherein the first stent is connected to the connecting portion by protruding from the connecting portion by a predetermined length.

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