Stent for preventing deviation

Abstract

The present invention relates to a stent for preventing displacement, which prevents displacement from the treated position when an external force is applied, and for continuously expanding a stenotic or occlusive lesion site in a lumen of the body, or for continuously securing a passage for endoscopic procedures, fluid drainage, shunt surgery, etc., by connecting two adjacent lumens of the body. More specifically, the stent for preventing displacement comprises a cylindrical body with numerous spaces formed between wires made of a superelastic shape memory alloy, and a locking portion is formed on one side of the cylindrical body, which protrudes outward in a ring shape and tilts toward the opposite side of the cylindrical body, locking into the lumen where the lesion site has occurred, or being inserted into a lumen with a through-hole and locking around the through-hole, and the locking portion expands while shortening in length when an external force is applied.

Description

Technical Field

[0001] The present invention relates to an anti-deviation stent for expanding a stenotic or occluded lesion site generated in a body lumen, or for securing a passage for performing endoscopic surgery, draining body fluids, shunt surgery, etc. by connecting two adjacent lumens in the body.

Background Art

[0002] Generally, when a stenotic or occluded lesion site occurs in a body lumen such as the biliary tract, esophagus, urethra, ureter, etc. in the human body, there arises a problem that the inherent function as a body lumen for moving body fluids deteriorates.

[0003] Therefore, by inserting a stent at the position of the stenotic or occluded lesion site, the narrowed body lumen was expanded.

[0004] In addition, in order to secure a passage for performing endoscopic surgery, draining body fluids such as bile, or shunt surgery, etc. in the biliary system, pancreas, gastrointestinal tract, duodenum, etc., a stent for connecting two adjacent lumens in the body was sometimes used.

[0005] In this regard, Patent Document 1 discloses that both sides of a hollow cylindrical body formed to have a number of rhombic spaces by crossing and knitting super-elastic shape memory alloy wires are expanded outward and turned back around a bent portion to form wing portions that are oppositely formed to actuate tension in the longitudinal direction of the body, so that the wing portions elastically move inward and outward according to the distance between adjacent tissues or the wall thickness of a human organ and are configured to be closely installed on the adjacent tissues of the human organ while automatically adjusting the interval. A stent for connecting adjacent tissues of a human organ is provided.

[0006] Furthermore, Patent Document 2 provides a double-structured stent with excellent corrosion resistance, comprising an internal stent, a first coating portion formed on the surface of the internal stent, an external stent bonded to the internal stent on which the first coating portion is formed, and a bonding portion between the internal stent and the external stent, wherein the bonding portion includes a second coating portion, and the second coating portion includes a single-layer or multi-layer coating portion.

[0007] Furthermore, Patent Document 3 provides a stent including a body having an extended tubular structure and a retractable structure, wherein in the retractable structure, the downstream end of the body expands as a downstream flange structure, the upstream end of the body expands as an expanded flange structure, a cylindrical saddle region extends between the downstream flange structure and the expanded flange structure, the expanded flange structure includes an inclined portion and a cylindrical portion, and the expanded flange structure has an axial length that is at least as long as the axial length of the cylindrical saddle region.

[0008] Furthermore, Patent Document 4 provides a tissue lumen stent including a body having an extended tubular configuration and an unfolded configuration, wherein, in the unfolded configuration when unfolded from tissue, the second end of the body opposite the first end extends radially as first and second flange structures, with a cylindrical saddle region placed between them, and at least one of the first and second flange structures includes at least first and second inflection points that form first and second segments of the flange structure, the angle of the first inflection point toward the central plane of the cylindrical saddle region formed by the first segment and the cylindrical saddle region is at least the size of the diagonal of the second inflection point that is formed by the first and second segments and is further from the central plane, at least one first segment of the first and second flange structures includes a portion where the diameter increases, and at least one second segment of the first and second flange structures includes a portion where the diameter decreases.

[0009] However, there is a need for a stent with a structure different from that described in Patent Documents 1, 2, 3, and 4, which prevents displacement from the implanted position when external forces such as body tremors occur. [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] Korean Registered Patent Publication No. 10-1311756 [Patent Document 2] Korean Registered Patent Publication No. 10-1824814 [Patent Document 3] Korean Registered Patent Publication No. 10-2247660 [Patent Document 4] Korean Registered Patent Publication No. 10-2493269 [Overview of the project] [Problems that the invention aims to solve]

[0011] Therefore, the present invention aims to provide a stent with a different structure from conventional stents that prevents displacement from the treated position when external forces such as body shaking occur, thereby continuously expanding a narrowed or obstructed lesion site in an internal lumen, or connecting two adjacent internal lumens in the body to continuously secure a passage for endoscopic procedures, fluid drainage, shunt surgery, etc. [Means for solving the problem]

[0012] To achieve the above objectives, the present invention provides a stent for preventing displacement that expands a stenotic or occluded lesion site in a lumen of the body, or connects two through-holes formed in two adjacent lumens of the body, comprising a cylindrical body formed by weaving or intersecting wires made of a superelastic shape memory alloy in a mesh-like manner, with numerous spaces formed between the wires, wherein one side of the cylindrical body has a locking portion that protrudes outward in a ring shape and tilts toward the opposite side of the cylindrical body, locking into the lumen where the lesion site has occurred, or being inserted into a lumen where a through-hole has been formed and locking around the through-hole, and wherein when an external force is transmitted, the locking portion expands while its length shortens in the longitudinal direction of the cylindrical body. [Effects of the Invention]

[0013] In the first embodiment of the present invention, when an external force is transmitted, the locking portion of the cylindrical body expands while shortening in length, and is inserted more deeply into the lumen where the lesion has occurred and locked in place, or the area in close contact with the lumen where the through-hole is formed increases.

[0014] In other words, it has the effect of preventing the stent from moving out of its surgical position when external force is applied.

[0015] In other words, it has the effect of continuously dilating narrowed or obstructed lesions in the body's internal lumens, or connecting two adjacent internal lumens to continuously secure a passage for endoscopic procedures, fluid drainage, and shunt surgery.

[0016] In the first embodiment of the present invention, since the locking portions are formed on both sides of the cylindrical body, when an external force is generated, the lesion site is more effectively locked into the internal lumen of the body where the lesion occurred.

[0017] Furthermore, it has the effect of being locked into each of the two lumens through which the through-holes are formed.

[0018] In addition, since the pair of locking portions are inclined toward each other, when an external force is generated, there is an effect that they are pressed against the inner cavity of the body in opposite directions and expanded.

[0019] That is, there is an effect that the anti-deviation stent does not deviate further from the implantation position.

[0020] In the first embodiment of the present invention, while the angle between the cylindrical body and the locking portion is formed to be 20 to 40°, there is an effect that the elasticity of the locking portion becomes stronger.

[0021] That is, when an external force is generated, there is an effect of preventing the locking portion from being turned over in the opposite direction to the inclined direction and slipping off from the lesion site or passing through the through-hole formed in the inner cavity and deviating.

[0022] In addition, the locking portion has an effect of withstanding without being greatly compressed even when an external force is transmitted in a direction intersecting the direction in which the body fluid moves at the lesion site.

[0023] In the first embodiment of the present invention, since the protruding portion protrudes from one end or both ends of the cylindrical body, there is an effect that the protruding portion supports the locking portion.

[0024] That is, when an external force is generated, there is an effect of further preventing the locking portion from being turned over.

[0025] In the first embodiment of the present invention, since the coating portion is formed on the entire cylindrical body, there is an effect of preventing the growth of the lesion site into the space portion.

[0026] In the first embodiment of the present invention, since the coating portion is formed only on a part of the cylindrical body, there is an effect that the remaining part of the cylindrical body where the coating portion is not formed becomes flexible.

[0027] That is, the anti-deviation stent has an effect of being flexibly deformed in accordance with the bent inner cavity.

[0028] In the first embodiment of the present invention, since a large number of coating portions are formed at predetermined intervals along the longitudinal direction of the cylindrical body, there is an effect in which a large number of flexible sections are formed between the coating portions along the longitudinal direction of the cylindrical body.

[0029] In other words, the stent designed to prevent displacement has the added benefit of being more flexible and able to conform to the curved shape of the lumen.

[0030] In the first embodiment of the present invention, the coating portion is made of a highly elastic silicone or PU material, which has the effect of further supporting the lesion site or through hole.

[0031] Furthermore, it has the effect of providing additional support and locking to the locking portion within the lumen of the body.

[0032] Furthermore, it has the effect of smoothly guiding bodily fluids into the silicone or PU coating.

[0033] The first embodiment of the present invention, when installed in the biliary tract connected to the duodenum, has the effect of preventing food and drink from flowing back from the duodenum into the biliary tract at the blocking portion.

[0034] The first embodiment of the present invention has the effect of reducing irritation to the internal lumen of the body because the locking portion is not sharply locked into the internal lumen of the body by its curved surface.

[0035] In the first embodiment of the present invention, the length of the locking portion is further increased, which enhances the elasticity of the locking portion and thus increases the supporting force for the lumen.

[0036] In other words, it has the effect of preventing the locking part from being overturned and slipping away from the lesion site when an external force is applied, or from slipping out through the through-hole formed in the lumen.

[0037] Furthermore, it has the effect of minimizing deformation of the locking part when an external force is applied, thereby reducing irritation to the lumen.

[0038] In a second embodiment of the present invention, when an external force is transmitted to the first locking stent, which is installed on one side of the main stent by a connecting thread, the first locking portion and the second locking portion expand while their length shortens, thereby having the effect of being inserted deeper into the lumen where the lesion occurred and being locked, or increasing the area in close contact with the lumen where the through-hole is formed.

[0039] In other words, it has the effect of preventing the stent from dislodgeing from the lesion site when an external force is applied.

[0040] In other words, it has the effect of continuously dilating narrowed or obstructed lesions in the body's internal lumens, or connecting two adjacent internal lumens to continuously secure a passage for endoscopic procedures, fluid drainage, and shunt surgery.

[0041] In the second embodiment of the present invention, a pair of first locking stents are attached to both sides of the main stent by connecting threads, which has the effect of locking more effectively into the internal lumen of the body where the lesion occurred when an external force is generated.

[0042] Furthermore, it has the effect of being locked into each of the two lumens through which the through-holes are formed.

[0043] Furthermore, because the pair of second locking parts face each other, when an external force is generated, the first locking part and the second locking part are pressed against each other in opposite directions into the lumen of the body, resulting in expansion.

[0044] In other words, it has the effect of preventing the stent from further displaced from the surgical site.

[0045] In the second embodiment of the present invention, the length of the first locking portion is formed to be even longer than the length of the second locking portion, which has the effect of increasing the support force of the first locking portion that supports the second locking portion.

[0046] In other words, when an external force is generated, it has the effect of minimizing the deformation of the first and second locking parts, thereby reducing stimulation to the lumen.

[0047] Furthermore, when an external force is applied, the first and second locking parts are prevented from being flipped over toward the second cylindrical body and slipping away from the lesion site, or from slipping out through the through-hole formed in the lumen.

[0048] In the second embodiment of the present invention, since the second locking portion is in close contact with the first cylindrical body, even if an external force is transmitted in a direction intersecting the direction of fluid movement at the lesion site, the first and second locking portions are not significantly compressed and can withstand the force.

[0049] In the second embodiment of the present invention, a gap is formed between the first cylindrical body and one end of the adjacent second locking portion, which has the effect of making the second locking portion flexible.

[0050] In other words, when an external force is generated, the second locking part deforms easily, and the first and second locking parts expand easily.

[0051] In the second embodiment of the present invention, since the diameter of the first cylindrical body and the diameter of the second cylindrical body are similar, the second cylindrical body has the effect of being in close contact with the first cylindrical body.

[0052] In other words, when an external force is applied, friction is generated between the first locking stent and the main stent.

[0053] In other words, it has the effect of preventing the first locking stent from slipping away from the main stent.

[0054] In the second embodiment of the present invention, since the diameter of the second cylindrical body is larger than the diameter of the first cylindrical body, the first locking stent can be easily fitted to the outside of the main stent.

[0055] In other words, it has the effect of making the installation of the first locking stent easier.

[0056] In the second embodiment of the present invention, a coating is formed over the entire first cylindrical body, which has the effect of preventing the growth of lesions into the first space.

[0057] In the second embodiment of the present invention, since the coating is formed only on a part of the first cylindrical body, the remaining part of the first cylindrical body that does not have the coating formed on it becomes flexible.

[0058] In other words, the stent designed to prevent displacement has the effect of flexibly deforming to conform to the curved shape of the lumen.

[0059] In the second embodiment of the present invention, since a large number of coating portions are formed at predetermined intervals along the longitudinal direction of the first cylindrical body, there is an effect that a large number of flexible sections are formed between the coating portions along the longitudinal direction of the first cylindrical body.

[0060] In other words, the stent designed to prevent displacement has the added benefit of becoming even more flexible and deformable to conform to the curved shape of the lumen.

[0061] In the second embodiment of the present invention, the coating portion is made of a highly elastic silicone or PU material, which has the effect of further supporting the lesion site or through hole.

[0062] Furthermore, it has the effect of smoothly guiding bodily fluids into the silicone or PU hard coating.

[0063] In the second embodiment of the present invention, a coating is formed over the entire first locking stent, which has the effect of preventing the growth of the lesion site into the second space.

[0064] In the second embodiment of the present invention, since the coating portion is made of a highly elastic silicone or PU material, the elasticity of the first locking portion and the second locking portion is enhanced.

[0065] In other words, the first and second locking parts are further supported and locked by the internal lumen of the body where the lesion occurred, or the second locking part is further supported and locked by the internal lumen of the body where the through-hole is formed.

[0066] Furthermore, when an external force is applied, friction is generated between the first cylindrical body and the second cylindrical body, which has the added effect.

[0067] In other words, it has the effect of further preventing the first locking stent from slipping away from the main stent.

[0068] In a second embodiment of the present invention, when an external force is transmitted to a second locking stent, which is attached to one side of the main stent by a connecting thread, the locking portion expands while shortening in length, which has the effect of being inserted deeper into the lumen where the lesion occurred and being locked in, or increasing the area that is in close contact with the lumen where the through-hole is formed.

[0069] In the second embodiment of the present invention, the first and second locking stents, or a pair of second locking stents, are installed on both sides of the main stent by connecting threads, which has the effect of locking more effectively into the internal lumen of the body where the lesion occurred when an external force is generated.

[0070] Furthermore, it has the effect of being locked into each of the two lumens through which the through-holes are formed.

[0071] Furthermore, because the second locking part and the locking part, or the pair of locking parts, face each other, when an external force is generated, the second locking part and the locking part, or the pair of locking parts, are pressed against each other in opposite directions into the lumen of the body and expand.

[0072] In other words, it has the effect of preventing the stent from further displaced from the surgical site.

[0073] In the second embodiment of the present invention, since the edge of the locking portion is in close contact with the first cylindrical body, the locking portion can withstand external forces transmitted in a direction intersecting the direction of fluid movement at the lesion site without being significantly compressed.

[0074] In the second embodiment of the present invention, a gap is formed between the first cylindrical body and one end of an adjacent edge, which has the effect of making the locking portion flexible.

[0075] In other words, when an external force is applied, the locking mechanism easily deforms and expands, which has the effect of being able to expand.

[0076] In the second embodiment of the present invention, since the diameter of the first cylindrical body and the diameter of the third cylindrical body are similar, the third cylindrical body has the effect of being in close contact with the first cylindrical body.

[0077] In other words, when an external force is applied, friction is generated between the second locking stent and the main stent.

[0078] In other words, it has the effect of preventing the second locking stent from slipping away from the main stent.

[0079] In the second embodiment of the present invention, the diameter of the third cylindrical body is larger than the diameter of the first cylindrical body, which has the effect that the second locking stent can be easily fitted to the outside of the main stent.

[0080] In other words, it has the effect of simplifying the installation of the second locking stent.

[0081] In the second embodiment of the present invention, a coating is formed over the entire second locking stent, which has the effect of preventing the growth of the lesion site into the third space.

[0082] In the second embodiment of the present invention, the coating portion is made of a highly elastic silicone or PU material, which has the effect of increasing the elasticity of the locking portion.

[0083] In other words, the locking portion is further supported and locked by the internal lumen where the lesion occurred, or the locking portion is further supported and locked by the internal lumen where the through-hole is formed.

[0084] Furthermore, when an external force is applied, friction is generated between the first cylindrical body and the third cylindrical body, which has the added effect.

[0085] In other words, it has the effect of further preventing the second locking stent from slipping away from the main stent.

[0086] In the second embodiment of the present invention, the locking portion of the second locking stent is not sharply locked into the lumen of the body by its curved surface, thus reducing irritation to the lumen of the body.

[0087] A second embodiment of the present invention has the effect of increasing the elasticity of the locking portion while forming an angle of 20 to 40° between the first cylindrical body and the edge of the locking portion.

[0088] In other words, when an external force is applied, it has the effect of preventing the locking part from being flipped over in the opposite direction of the tilt and slipping away from the lesion site, or from slipping out through the through-hole formed in the lumen.

[0089] Furthermore, the locking mechanism has the effect of withstanding external forces transmitted in a direction intersecting the direction of fluid movement at the lesion site without being significantly compressed.

[0090] In the second embodiment of the present invention, the length of the locking portion is further increased, which enhances the elasticity of the locking portion and thus increases the supporting force for the lumen.

[0091] In other words, it has the effect of preventing the locking part from being overturned and slipping away from the lesion site when an external force is applied, or from slipping out through the through-hole formed in the lumen.

[0092] Furthermore, it has the effect of minimizing deformation of the locking part when an external force is applied, thereby reducing irritation to the lumen.

[0093] In the second embodiment of the present invention, since the first and second locking stents are located outside the main stent, there is an effect of preventing bodily fluids from flowing in or sludge from settling between the main stent and the first and second locking parts, and between the main stent and the locking parts.

[0094] The third embodiment of the present invention has the effect that the locking portion of the main stent and the first and second locking portions of the first locking stent are locked into the internal lumen of the body where the lesion site has occurred.

[0095] Furthermore, it has the effect of being locked into each of the two lumens through which the through-holes are formed.

[0096] Furthermore, when an external force is applied, it has the effect of expanding while shortening in length, allowing it to be inserted deeper into the lumen where the lesion occurred and become locked in place, or increasing the area in which it makes close contact with the lumen where a through-hole has been formed.

[0097] Furthermore, because the locking portion of the main stent and the second locking portion of the first locking stent face each other, when an external force is generated, they are pressed against each other in opposite directions into the body lumen and expand, which has the effect of causing them to expand.

[0098] In other words, it has the effect of preventing the stent from moving out of its surgical position when external force is applied.

[0099] In other words, it has the effect of continuously dilating narrowed or obstructed lesions in the body's internal lumens, or connecting two adjacent internal lumens to continuously secure a passage for endoscopic procedures, fluid drainage, and shunt surgery.

[0100] A third embodiment of the present invention has the effect of increasing the elasticity of the locking portion while forming an angle of 20 to 40° between the first cylindrical body and the locking portion.

[0101] In other words, when an external force is applied, it has the effect of preventing the locking part from being flipped over in the opposite direction of the tilt and slipping away from the lesion site, or from slipping out through the through-hole formed in the lumen.

[0102] Furthermore, the locking mechanism has the effect of withstanding external forces transmitted in a direction intersecting the direction of fluid movement at the lesion site without being significantly compressed.

[0103] In the third embodiment of the present invention, the protruding portion is provided protruding from one end of the first cylindrical body, which has the effect of the protruding portion supporting the locking portion.

[0104] In other words, it has the effect of further preventing the locking mechanism from being overturned when an external force is applied.

[0105] In the third embodiment of the present invention, a coating is formed over the entire first cylindrical body, which has the effect of preventing the growth of lesions into the first space.

[0106] In the third embodiment of the present invention, since the coating is formed only on a part of the first cylindrical body, the remaining part of the first cylindrical body that does not have the coating formed on it becomes flexible.

[0107] In other words, the stent designed to prevent displacement has the effect of flexibly deforming to conform to the curved shape of the lumen.

[0108] In the third embodiment of the present invention, since a large number of coating portions are formed at predetermined intervals along the longitudinal direction of the first cylindrical body, there is an effect that a large number of flexible sections are formed between the coating portions along the longitudinal direction of the first cylindrical body.

[0109] In other words, the stent designed to prevent displacement has the added benefit of becoming even more flexible and deformable to conform to the curved shape of the lumen.

[0110] A third embodiment of the present invention has the effect of further supporting the lesion site or through hole because the coating portion is made of a highly elastic silicone or PU material.

[0111] Furthermore, the locking mechanism is further supported and secured within the internal lumen of the body, providing an additional benefit.

[0112] Furthermore, it has the effect of smoothly guiding bodily fluids into the silicone or PU coating.

[0113] A third embodiment of the present invention has the effect of preventing food and drink from flowing back from the duodenum into the bile duct when installed in the bile duct connected to the duodenum.

[0114] A third embodiment of the present invention has the effect of reducing irritation to the internal lumen of the body because the locking portion is not sharply locked into the internal lumen of the body by its curved surface.

[0115] A third embodiment of the present invention has the effect of increasing the support force for the lumen because the length of the locking portion is further increased and the elasticity of the locking portion is strengthened.

[0116] In other words, it has the effect of preventing the locking part from being overturned and slipping away from the lesion site when an external force is applied, or from slipping out through the through-hole formed in the lumen.

[0117] Furthermore, it has the effect of minimizing deformation of the locking part when an external force is applied, thereby reducing irritation to the lumen.

[0118] In the third embodiment of the present invention, the length of the first locking portion is formed to be even longer than the length of the second locking portion, which has the effect of increasing the support force of the first locking portion that supports the second locking portion.

[0119] In other words, when an external force is generated, it has the effect of minimizing the deformation of the first and second locking parts, thereby reducing stimulation to the lumen.

[0120] Furthermore, when an external force is applied, the first and second locking parts are prevented from being flipped over toward the second cylindrical body and slipping away from the lesion site, or from slipping out through the through-hole formed in the lumen.

[0121] In the third embodiment of the present invention, since the second locking portion is in close contact with the first cylindrical body, even if an external force is transmitted in a direction intersecting the direction of fluid movement at the lesion site, the first locking portion and the second locking portion can withstand the force without being significantly compressed.

[0122] In the third embodiment of the present invention, a gap is formed between the first cylindrical body and one end of the adjacent second locking portion, which has the effect of making the second locking portion flexible.

[0123] In other words, when an external force is generated, the second locking part deforms easily, and the first and second locking parts expand easily.

[0124] In the third embodiment of the present invention, since the diameter of the first cylindrical body and the diameter of the second cylindrical body are similar, the second cylindrical body has the effect of fitting tightly to the first cylindrical body.

[0125] In other words, when an external force is applied, friction is generated between the first locking stent and the main stent.

[0126] In other words, it has the effect of preventing the first locking stent from slipping away from the main stent.

[0127] In the third embodiment of the present invention, the diameter of the second cylindrical body is larger than the diameter of the first cylindrical body, which has the effect that the first locking stent can be easily fitted to the outside of the main stent.

[0128] In other words, it has the effect of making the installation of the first locking stent easier.

[0129] In the third embodiment of the present invention, a coating is formed over the entire first locking stent, which has the effect of preventing the growth of the lesion site into the second space.

[0130] In the third embodiment of the present invention, since the coating portion is made of a highly elastic silicone or PU material, the elasticity of the first locking portion and the second locking portion is enhanced.

[0131] In other words, the first and second locking parts are further supported and locked by the internal lumen where the lesion occurred, or the second locking part is further supported and locked by the internal lumen where the through-hole is formed.

[0132] Furthermore, when an external force is applied, friction is generated between the first cylindrical body and the second cylindrical body, which has the added effect.

[0133] In other words, it has the effect of further preventing the first locking stent from slipping away from the main stent.

[0134] The third embodiment of the present invention has the effect that the locking portion of the main stent and the locking portion of the second locking stent are locked into the internal lumen of the body where the lesion site has occurred.

[0135] Furthermore, it has the effect of being locked into each of the two lumens through which the through-holes are formed.

[0136] Furthermore, when an external force is applied, it has the effect of expanding while shortening in length, allowing it to be inserted deeper into the lumen where the lesion occurred and become locked in place, or increasing the area in which it makes close contact with the lumen where a through-hole has been formed.

[0137] Furthermore, because the locking portion of the main stent and the locking portion of the second locking stent face each other, when an external force is generated, they are pressed against each other in opposite directions into the lumen of the body and expand, which has the effect of causing them to expand.

[0138] In other words, it has the effect of preventing the stent from moving out of its surgical position when external force is applied.

[0139] In other words, it has the effect of continuously dilating narrowed or obstructed lesions in the body's internal lumens, or connecting two adjacent internal lumens to continuously secure a passage for endoscopic procedures, fluid drainage, and shunt surgery.

[0140] In the third embodiment of the present invention, since the edge of the locking portion is in close contact with the first cylindrical body, the locking portion can withstand external forces transmitted in a direction intersecting the direction of fluid movement at the lesion site without being significantly compressed.

[0141] In the third embodiment of the present invention, a gap is formed between the first cylindrical body and one end of an adjacent edge, which has the effect of making the locking portion flexible.

[0142] In other words, when an external force is applied, the locking mechanism easily deforms and expands, which has the effect of being able to expand.

[0143] In the third embodiment of the present invention, since the diameter of the first cylindrical body and the diameter of the third cylindrical body are similar, the third cylindrical body has the effect of fitting tightly to the first cylindrical body.

[0144] In other words, when an external force is applied, friction is generated between the second locking stent and the main stent.

[0145] In other words, it has the effect of preventing the second locking stent from slipping away from the main stent.

[0146] In the third embodiment of the present invention, the diameter of the third cylindrical body is larger than the diameter of the first cylindrical body, which has the effect that the second locking stent can be easily fitted to the outside of the main stent.

[0147] In other words, it has the effect of making the installation of the second locking stent easier.

[0148] In the third embodiment of the present invention, a coating is formed over the entire second locking stent, which has the effect of preventing the growth of the lesion site into the third space.

[0149] In the third embodiment of the present invention, the coating portion is made of a highly elastic silicone or PU material, which has the effect of increasing the elasticity of the locking portion.

[0150] In other words, the locking portion is further supported and locked by the internal lumen where the lesion occurred, or the locking portion is further supported and locked by the internal lumen where the through-hole is formed.

[0151] Furthermore, when an external force is applied, friction is generated between the first cylindrical body and the third cylindrical body, which has the added effect.

[0152] In other words, it has the effect of further preventing the second locking stent from slipping away from the main stent.

[0153] A third embodiment of the present invention has the effect of reducing irritation to the internal lumen of the body because the locking portion of the second locking stent is not sharply locked into the internal lumen of the body by its curved surface.

[0154] A third embodiment of the present invention has the effect of increasing the elasticity of the locking portion while forming an angle of 20 to 40° between the first cylindrical body and the edge of the locking portion.

[0155] In other words, when an external force is applied, it has the effect of preventing the locking part from being flipped over in the opposite direction of the tilt and slipping away from the lesion site, or from slipping out through the through-hole formed in the lumen.

[0156] Furthermore, the locking mechanism has the effect of withstanding external forces transmitted in a direction intersecting the direction of fluid movement at the lesion site without being significantly compressed.

[0157] A third embodiment of the present invention has the effect of increasing the support force for the lumen because the length of the locking portion is further increased and the elasticity of the locking portion is strengthened.

[0158] In other words, it has the effect of preventing the locking part from being overturned and slipping away from the lesion site when an external force is applied, or from slipping out through the through-hole formed in the lumen.

[0159] Furthermore, it has the effect of minimizing deformation of the locking part when an external force is applied, thereby reducing irritation to the lumen.

[0160] In the third embodiment of the present invention, the first locking stent and the second locking stent are located outside the main stent, which has the effect of preventing bodily fluids from flowing in or sludge from settling between the main stent and the first and second locking parts, and between the main stent and the locking parts. [Brief explanation of the drawing]

[0161] [Figure 1] These are a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to the first embodiment of the present invention. [Figure 2] These are a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to the first embodiment of the present invention. [Figure 3] These are a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to the first embodiment of the present invention. [Figure 4] This is a diagram showing the usage state of a stent for preventing deviation according to the first embodiment of the present invention. [Figure 5] This is a diagram showing the usage state of a stent for preventing deviation according to the first embodiment of the present invention. [Figure 6] This is a diagram showing the usage state of a stent for preventing deviation according to the first embodiment of the present invention. [Figure 7] This is a diagram showing the usage state of a stent for preventing deviation according to the first embodiment of the present invention. [Figure 8] This is a front view of a stent for preventing deviation according to a first modification of the first embodiment of the present invention. [Figure 9] This is a diagram showing the usage state of a stent for preventing deviation according to a first modification of the first embodiment of the present invention. [Figure 10] This is a diagram showing the usage state of a stent for preventing deviation according to a first modification of the first embodiment of the present invention. [Figure 11] This is a front view of a stent for preventing deviation according to a second modification of the first embodiment of the present invention. [Figure 12] This is a front view of a stent for preventing deviation according to a third modification of the first embodiment of the present invention. [Figure 13] This shows a front view, a partially enlarged cross-sectional view, and a diagram of the usage state of a stent for preventing deviation according to a fourth modification of the first embodiment of the present invention. [Figure 14] This shows a front view, a partially enlarged cross-sectional view, and a diagram of the usage state of a stent for preventing deviation according to a fourth modification of the first embodiment of the present invention. [Figure 15] This shows a front view, a partially enlarged cross-sectional view, and a diagram of the usage state of a stent for preventing deviation according to a fourth modification of the first embodiment of the present invention. [Figure 16] This shows a front view, a partially enlarged cross-sectional view, and a diagram of the usage state of a stent for preventing deviation according to a fourth modification of the first embodiment of the present invention. [Figure 17] This is a diagram showing the usage state of a stent for preventing deviation according to a fifth modification of the first embodiment of the present invention. [Figure 18] This is a diagram showing the usage state of a stent for preventing deviation according to a sixth modification of the first embodiment of the present invention. [Figure 19] This is a front view of a stent for preventing deviation according to a seventh modification of the first embodiment of the present invention. [Figure 20] This is a cross-sectional view along line AA in Figure 19. [Figure 21] This is a front view of a stent for preventing deviation according to the eighth modification of the first embodiment of the present invention. [Figure 22] These are exploded views, assembled views, and partially enlarged cross-sectional views of a stent for preventing deviation according to a second embodiment of the present invention. [Figure 23] These are exploded views, assembled views, and partially enlarged cross-sectional views of a stent for preventing deviation according to a second embodiment of the present invention. [Figure 24] These are exploded views, assembled views, and partially enlarged cross-sectional views of a stent for preventing deviation according to a second embodiment of the present invention. [Figure 25]These are exploded views, assembled views, and partially enlarged cross-sectional views of a stent for preventing deviation according to a second embodiment of the present invention. [Figure 26] These are exploded views, assembled views, and partially enlarged cross-sectional views of a stent for preventing deviation according to a second embodiment of the present invention. [Figure 27] This is a diagram showing the usage state of a stent for preventing deviation according to a second embodiment of the present invention. [Figure 28] This is a diagram showing the usage state of a stent for preventing deviation according to a second embodiment of the present invention. [Figure 29] This is a diagram showing the usage state of a stent for preventing deviation according to a second embodiment of the present invention. [Figure 30] This is a diagram showing the usage state of a stent for preventing deviation according to a second embodiment of the present invention. [Figure 31] This is a diagram showing the usage state of a stent for preventing deviation according to a second embodiment of the present invention. [Figure 32] This is a diagram showing the usage state of a stent for preventing deviation according to a second embodiment of the present invention. [Figure 33] This is a diagram showing the usage state of a stent for preventing deviation according to a first modification of the second embodiment of the present invention. [Figure 34] This is a diagram showing the usage state of a stent for preventing deviation according to a first modification of the second embodiment of the present invention. [Figure 35] This is a diagram showing the usage state of a stent for preventing deviation according to a first modification of the second embodiment of the present invention. [Figure 36] This is a diagram showing the usage state of a stent for preventing deviation according to a first modification of the second embodiment of the present invention. [Figure 37] This is a partially enlarged cross-sectional view and a diagram showing the usage state of a stent for preventing deviation, according to a second modification of the second embodiment of the present invention. [Figure 38] This is a partially enlarged cross-sectional view and a diagram showing the usage state of a stent for preventing deviation, according to a second modification of the second embodiment of the present invention. [Figure 39] This is a partially enlarged cross-sectional view and a diagram showing the usage state of a stent for preventing deviation, according to a second modification of the second embodiment of the present invention. [Figure 40] This is a diagram showing the usage state of a stent for preventing deviation according to a third modification of the second embodiment of the present invention. [Figure 41] This is an exploded view of a stent for preventing deviation according to a fourth modification of the second embodiment of the present invention. [Figure 42] This is a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to a fifth modification of the second embodiment of the present invention. [Figure 43] This is a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to a fifth modification of the second embodiment of the present invention. [Figure 44] This is a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to a fifth modification of the second embodiment of the present invention. [Figure 45] This is a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to a fifth modification of the second embodiment of the present invention. [Figure 46] This is a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to a fifth modification of the second embodiment of the present invention. [Figure 47] This is a diagram showing the usage state of a stent for preventing deviation according to a sixth modification of the second embodiment of the present invention. [Figure 48] This is a diagram showing the usage state of a stent for preventing deviation according to a seventh modification of the second embodiment of the present invention. [Figure 49] These are exploded views, joined views, and partially enlarged cross-sectional views of a stent for preventing deviation according to the eighth modification of the second embodiment of the present invention. [Figure 50] These are exploded views, joined views, and partially enlarged cross-sectional views of a stent for preventing deviation according to the eighth modification of the second embodiment of the present invention. [Figure 51] These are exploded views, joined views, and partially enlarged cross-sectional views of a stent for preventing deviation according to the eighth modification of the second embodiment of the present invention. [Figure 52] These are exploded views, joined views, and partially enlarged cross-sectional views of a stent for preventing deviation according to the eighth modification of the second embodiment of the present invention. [Figure 53] These are exploded views, joined views, and partially enlarged cross-sectional views of a stent for preventing deviation according to the eighth modification of the second embodiment of the present invention. [Figure 54] This is a diagram showing the usage state of a stent for preventing deviation according to the eighth modification of the second embodiment of the present invention. [Figure 55] This is a diagram showing the usage state of a stent for preventing deviation according to the eighth modification of the second embodiment of the present invention. [Figure 56] This is a diagram showing the usage state of a stent for preventing deviation according to the eighth modification of the second embodiment of the present invention. [Figure 57] This is a diagram showing the usage state of a stent for preventing deviation according to the eighth modification of the second embodiment of the present invention. [Figure 58] This is a diagram showing the usage state of a stent for preventing deviation according to a ninth modification of the second embodiment of the present invention. [Figure 59] This is a diagram showing the usage state of a stent for preventing deviation according to a ninth modification of the second embodiment of the present invention. [Figure 60] This is a diagram showing the usage state of a stent for preventing deviation according to a ninth modification of the second embodiment of the present invention. [Figure 61] This is a diagram showing the usage state of a stent for preventing deviation according to a ninth modification of the second embodiment of the present invention. [Figure 62] This is a front view of a stent for preventing deviation according to a tenth modified example of the second embodiment of the present invention. [Figure 63] This is a partially enlarged cross-sectional view of a stent for preventing deviation according to an eleventh modification of the second embodiment of the present invention. [Figure 64] This is an exploded view of a stent for preventing deviation according to a twelfth modification of the second embodiment of the present invention. [Figure 65] This is a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to a 13th modification of the second embodiment of the present invention. [Figure 66] This is a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to a 13th modification of the second embodiment of the present invention. [Figure 67] This is a front view of a stent for preventing deviation according to a 14th modified example of the second embodiment of the present invention. [Figure 68] These are exploded views, a front view, and a partially enlarged cross-sectional view of a stent for preventing deviation according to a third embodiment of the present invention. [Figure 69] These are exploded views, a front view, and a partially enlarged cross-sectional view of a stent for preventing deviation according to a third embodiment of the present invention. [Figure 70]These are exploded views, a front view, and a partially enlarged cross-sectional view of a stent for preventing deviation according to a third embodiment of the present invention. [Figure 71] These are exploded views, a front view, and a partially enlarged cross-sectional view of a stent for preventing deviation according to a third embodiment of the present invention. [Figure 72] These are exploded views, a front view, and a partially enlarged cross-sectional view of a stent for preventing deviation according to a third embodiment of the present invention. [Figure 73] These are exploded views, a front view, and a partially enlarged cross-sectional view of a stent for preventing deviation according to a third embodiment of the present invention. [Figure 74] This is a diagram showing the usage state of a stent for preventing deviation according to the third embodiment of the present invention. [Figure 75] This is a diagram showing the usage state of a stent for preventing deviation according to the third embodiment of the present invention. [Figure 76] This is a diagram showing the usage state of a stent for preventing deviation according to the third embodiment of the present invention. [Figure 77] This is a diagram showing the usage state of a stent for preventing deviation according to the third embodiment of the present invention. [Figure 78] This is a front view of a stent for preventing deviation according to a first modification of the third embodiment of the present invention. [Figure 79] This is a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to a second modification of the third embodiment of the present invention. [Figure 80] This is a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to a second modification of the third embodiment of the present invention. [Figure 81] This is a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to a second modification of the third embodiment of the present invention. [Figure 82] This is a diagram showing the usage state of a stent for preventing deviation according to a second modification of the third embodiment of the present invention. [Figure 83] This is a diagram showing the usage state of a stent for preventing deviation according to a second modification of the third embodiment of the present invention. [Figure 84] This is a diagram showing the usage state of a stent for preventing deviation according to a third modification of the third embodiment of the present invention. [Figure 85]This is a diagram showing the usage state of a stent for preventing deviation according to a fourth modification of the third embodiment of the present invention. [Figure 86] This is a front view of a stent for preventing deviation according to a fifth modification of the third embodiment of the present invention. [Figure 87] This is a cross-sectional view along line BB in Figure 86. [Figure 88] This is a front view of a stent for preventing deviation according to a sixth modification of the third embodiment of the present invention. [Figure 89] This is a partially enlarged cross-sectional view of a stent for preventing deviation according to a seventh modification of the third embodiment of the present invention. [Figure 90] This is a diagram showing the usage state of a stent for preventing deviation according to a seventh modification of the third embodiment of the present invention. [Figure 91] This is a diagram showing the usage state of a stent for preventing deviation according to a seventh modification of the third embodiment of the present invention. [Figure 92] This is a partially enlarged cross-sectional view of a stent for preventing deviation according to the eighth modification of the third embodiment of the present invention. [Figure 93] This is an exploded view of a stent for preventing deviation according to the ninth modification of the third embodiment of the present invention. [Figure 94] These are exploded views, a front view, and a partially enlarged cross-sectional view of a stent for preventing deviation according to a 10th modification of the third embodiment of the present invention. [Figure 95] These are exploded views, a front view, and a partially enlarged cross-sectional view of a stent for preventing deviation according to a 10th modification of the third embodiment of the present invention. [Figure 96] These are exploded views, a front view, and a partially enlarged cross-sectional view of a stent for preventing deviation according to a 10th modification of the third embodiment of the present invention. [Figure 97] These are exploded views, a front view, and a partially enlarged cross-sectional view of a stent for preventing deviation according to a 10th modification of the third embodiment of the present invention. [Figure 98] This is a diagram showing the usage state of a stent for preventing deviation according to a 10th modified example of the third embodiment of the present invention. [Figure 99] This is a diagram showing the usage state of a stent for preventing deviation according to a 10th modified example of the third embodiment of the present invention. [Figure 100]This is a diagram showing the usage state of a stent for preventing deviation according to a 10th modified example of the third embodiment of the present invention. [Figure 101] This is a diagram showing the usage state of a stent for preventing deviation according to a 10th modified example of the third embodiment of the present invention. [Figure 102] This is a partially enlarged cross-sectional view of a stent for preventing deviation according to an eleventh modification of the third embodiment of the present invention. [Figure 103] This is an exploded view of a stent for preventing deviation according to a twelfth modification of the third embodiment of the present invention. [Figure 104] These are a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to a 13th modification of the third embodiment of the present invention. [Figure 105] These are a front view and a partially enlarged cross-sectional view of a stent for preventing deviation according to a 13th modification of the third embodiment of the present invention. [Figure 106] This is a partially enlarged cross-sectional view of a stent for preventing deviation according to a 14th modification of the third embodiment of the present invention. [Modes for carrying out the invention]

[0162] Hereinafter, embodiments of the present invention described above will be explained in detail with reference to the attached drawings.

[0163] As shown in Figures 1 to 106, the first, second, and third embodiments of the present invention and various modifications of the stent 1000 for preventing displacement are inserted into an internal lumen 1 of the human body, such as the bile duct, esophagus, urethra, or ureter, by a stent delivery system such as a catheter, and are used to expand a narrowed or obstructed lesion site 1a that has occurred in the internal lumen 1 of the human body.

[0164] Furthermore, the aforementioned stent 1000 for preventing displacement is used to connect two adjacent lumens 1 in the human body, such as the biliary tract, pancreas, gastrointestinal tract, and duodenum, using a stent delivery system such as a catheter.

[0165] Furthermore, as shown in Figures 1 to 7, the stent 1000 for preventing deviation according to the first embodiment of the present invention comprises a cylindrical body 100 in which wires 2 made of a superelastic shape memory alloy are woven together or intersected in a mesh-like manner to form a hollow cylindrical shape, and a number of spaces 110 are formed between the wires 2.

[0166] Here, around the space 110, a braided section in which the wires 2 are woven and an intersection section where the wires 2 cross are formed, forming a shape similar to a rhombus or the like.

[0167] Furthermore, one side of the cylindrical body 100 has a locking portion 120 formed thereon, which protrudes outward in a ring shape from a part of the cylindrical body 100, tilts toward the opposite side of the cylindrical body 100, and either locks into the lumen 1 where the lesion site 1a has occurred, or is inserted into the lumen 1 where the through-hole 1b has been formed and locks around the through-hole 1b.

[0168] Here, the angle θ between the cylindrical body 100 and the locking portion 120 is formed to be 20 to 40°, more precisely 22 to 33°, so that the elasticity of the locking portion 120 is increased.

[0169] Furthermore, a curved surface 121 is formed on the outer surface of a portion of the locking portion 120 that is located far from the cylindrical body 100.

[0170] Furthermore, the locking portion 120 is formed adjacent to one end of the cylindrical body 100.

[0171] Furthermore, the cylindrical body 100 is manufactured using at least one wire 2 and heat-treated, and consists of a stent 1000 for preventing displacement.

[0172] Furthermore, the cylindrical body 100 may be equipped with a pull cord used when removing the stent.

[0173] Here, the pull cord is sewn in a strip-like manner to one of the spaces 110 of the cylindrical body 100.

[0174] Therefore, the procedure is performed by inserting a stent 1000 to prevent displacement into the narrowed or obstructed lesion site 1a in the internal lumen 1 of the human body, such as the bile duct, esophagus, urethra, or ureter, through a stent delivery system such as a catheter.

[0175] As shown in Figure 4, the stent 1000 for preventing dislodgement expands the lesion site 1a while adhering tightly to the lumen 1 inside the body.

[0176] Here, the locking portion 120 is inserted into the lumen 1 and locked in place.

[0177] Furthermore, the locking portion 120 is no longer sharply locked into the lumen 1 by the curved surface 121.

[0178] Furthermore, as shown in Figure 5, when the locking portion 120 is subjected to the pressure of bodily fluids moving along the internal lumen 1 within the body, or external forces such as body swaying transmitted in the longitudinal direction of the internal lumen 1, the gap between the locking portion 120 and the cylindrical body 100 widens as the locking portion 120 is pressed by the internal lumen 1 within the body.

[0179] Here, the locking portion 120 expands in the longitudinal direction of the cylindrical body 100, with its length L decreasing, so that it is further inserted into the internal lumen 1 of the body and locked in place.

[0180] In other words, when an external force is transmitted, the locking portion 120 expands while being compressed.

[0181] Furthermore, because the angle θ between the cylindrical body 100 and the locking portion 120 is formed to be 20-40° and the locking portion 120 has strong elasticity, the locking portion 120 does not bend in the opposite direction to the inclined direction.

[0182] Furthermore, when the external force is interrupted, the locking portion 120 returns to its original state.

[0183] Furthermore, the procedure is performed by inserting a stent 1000 to prevent displacement into the perforations 1b of two adjacent lumens 1 within the human body, such as the biliary tract, pancreas, gastrointestinal tract, and duodenum, via a stent delivery system such as a catheter.

[0184] As shown in Figure 6, the stent 1000 for preventing dislodgement connects the through-holes 1b of two adjacent lumens 1 within the body.

[0185] Here, the cylindrical body 100 is fitted into a pair of through holes 1b, and the locking portion 120 is inserted into the inner cavity 1 and locked in place.

[0186] Furthermore, the locking portion 120 is no longer sharply locked into the lumen 1 by the curved surface 121.

[0187] Furthermore, as shown in Figure 7, when an external force such as body movement is transmitted to the locking portion 120 in a direction intersecting the longitudinal direction of the internal lumen 1 within the body, the gap between the locking portion 120 and the cylindrical body 100 widens as the locking portion 120 is pressed by the internal lumen 1 within the body.

[0188] Here, the locking portion 120 expands in the longitudinal direction of the cylindrical body 100 while its length L decreases, so that it is locked in close contact with the internal lumen 1 inside the body over a wider area around the through hole 1b.

[0189] In other words, when an external force is transmitted, the locking portion 120 expands while being compressed.

[0190] Furthermore, because the angle θ between the cylindrical body 100 and the locking portion 120 is formed to be 20-40° and the locking portion 120 has strong elasticity, the locking portion 120 does not bend in the opposite direction to the inclined direction.

[0191] Furthermore, when the external force is interrupted, the locking portion 120 returns to its original state.

[0192] Furthermore, as shown in Figures 8 to 10, the locking portion 120 of the stent 1000 for preventing deviation, according to the first modified example of the first embodiment of the present invention, is further formed on one of the opposite sides of the cylindrical body 100, but is formed to be inclined toward one side of the cylindrical body 100.

[0193] In other words, a pair of locking portions 120, each inclined toward each other, are formed on both sides of the cylindrical body 100.

[0194] Here, the pair of locking portions 120 are each located adjacent to both ends of the cylindrical body 100.

[0195] Therefore, as shown in Figure 9, when the pair of locking parts 120 located at the lesion site 1a are subjected to pressure from the internal lumen 1, such as the pressure of bodily fluids moving along the internal lumen 1, or external forces such as body movement transmitted in the longitudinal direction of the internal lumen 1, the gap between the pair of locking parts 120 and the cylindrical body 100 widens, and the locking parts 120 are pressed against by the internal lumen 1.

[0196] Here, the pair of locking portions 120 expand in the longitudinal direction of the cylindrical body 100, with their respective lengths L decreasing, thereby being further inserted into and locked into the internal lumen 1 of the body.

[0197] In other words, when an external force is transmitted to each of the pair of locking portions 120, they are compressed and expanded simultaneously.

[0198] Furthermore, as shown in Figure 10, the pair of locking portions 120 are inserted into the two lumens 1 and locked around the through-hole 1b.

[0199] In other words, both sides of the stent 1000 for preventing deviation are locked and fixed around the through hole 1b.

[0200] Therefore, when an external force such as body movement is transmitted in a direction that intersects the longitudinal direction of the internal cavity 1 within the body, the pair of locking parts 120 and the cylindrical body 100 expand and are pressed against each other by the internal cavity 1 within the body.

[0201] Here, the pair of locking portions 120 expand in the longitudinal direction of the cylindrical body 100, with their respective lengths L decreasing, so that they are locked in close contact with the internal lumen 1 around the through hole 1b over a wider area.

[0202] In other words, when an external force is transmitted to each of the pair of locking portions 120, they are compressed and expanded simultaneously.

[0203] Furthermore, as shown in Figure 11, a protrusion 130 is provided at one end of the cylindrical body 100 of the stent 1000 for preventing deviation, according to a second modification of the first embodiment of the present invention.

[0204] Here, the protruding portion 130 is provided protruding from one end of the cylindrical body 100 adjacent to the locking portion 120, and therefore supports the locking portion 120.

[0205] Furthermore, as shown in Figure 12, the protruding portion 130 of the stent 1000 for preventing deviation, according to the third modification of the first embodiment of the present invention, is provided protruding from both ends of the cylindrical body 100.

[0206] Here, the pair of protrusions 130 are provided protruding from both ends of the cylindrical body 100 adjacent to the pair of locking portions 120, and thus support the pair of locking portions 120.

[0207] Furthermore, as shown in Figures 13 to 16, the cylindrical body 100 of the stent 1000 for preventing deviation, according to the fourth modification of the first embodiment of the present invention, has a coating portion 140 formed over its entire surface, thereby closing the space portion 110.

[0208] Here, the coating portion 140 is made of silicone or PU (polyurethane) material, but it may also be made of a variety of materials such as synthetic resins, which are synthetic polymers harmless to the human body such as PU and silicone, or natural resins, which are natural polymer compounds.

[0209] Therefore, the coating portion 140 prevents the lesion portion 1a from being inserted into the space portion 110.

[0210] Furthermore, the coating portion 140 prevents bodily fluids from flowing out of the two adjacent lumens 1 inside the body.

[0211] Furthermore, as shown in Figure 17, in the fifth modified example of the first embodiment of the present invention, the cylindrical body 100 of the stent 1000 for preventing deviation has a coating portion 140 formed on only a part, i.e., only one part, thereby closing only a portion of the numerous spaces 110.

[0212] In other words, the remaining portion of the cylindrical body 100 where the coating portion 140 is not formed is more flexible than the portion of the cylindrical body 100 where the coating portion 140 is formed.

[0213] Here, the coating portion 140 is made of silicone or PU (polyurethane) material, but it may also be made of a variety of materials such as synthetic resins, which are synthetic polymers harmless to the human body such as PU and silicone, or natural resins, which are natural polymer compounds.

[0214] Therefore, the stent 1000 for preventing displacement can be easily deformed to correspond to the shape of the curved lumen 1.

[0215] Furthermore, as shown in Figure 18, in the sixth modified example of the first embodiment of the present invention, the cylindrical body 100 of the stent 1000 for preventing deviation has numerous coating portions 140 formed at predetermined intervals along its longitudinal direction, thereby closing only a portion of the numerous spaces 110.

[0216] In other words, various parts of the cylindrical body 100 become flexible between the numerous coated portions 140.

[0217] Here, the coating portion 140 is made of silicone or a PU (polyurethane) material, but various materials such as synthetic resins corresponding to synthetic polymers harmless to the human body like PU and silicone, and natural resins corresponding to natural polymer compounds may be used.

[0218] Therefore, the anti-deviation stent 1000 can be easily deformed corresponding to the form of the further bent inner cavity 1.

[0219] Also, as shown in FIGS. 19 and 20, a blocking portion 141 projects from the coating portion 140 on the inner surface of the cylindrical body 100 of the anti-deviation stent 1000 according to the seventh modification of the first embodiment of the present invention.

[0220] Here, the blocking portion 141 projects from the coating portion 140 toward the center of the cylindrical body 100.

[0221] For this reason, the blocking portion 141 blocks the backflow of substances in the body such as food and drink in the opposite direction to the direction in which the body fluid flows.

[0222] Also, as shown in FIG. 21, the length L of the locking portion 120 of the anti-deviation stent 1000 according to the eighth modification of the first embodiment of the present invention is formed to be even longer in the longitudinal direction of the cylindrical body 100.

[0223] Here, the length L of the locking portion 120 is formed to be even longer than the length L of the locking portion 12 in FIG. 3.

[0224] Also, as shown in FIGS. 3 and 21, at one end of the locking portion 120 located farthest from the cylindrical body 100, a virtual line 3 is located beside the cylindrical body 100.

[0225] For this reason, the angle θ2 between the locking portion 12 and the virtual line 3 shown in FIG. 21 is formed smaller than the angle θ1 shown in FIG. 3.

[0226] That is, the locking portion 120 has strong elasticity.

[0227] Therefore, when the locking portion 120 receives an external force, it is pressed by the lumen 1.

[0228] However, the locking portion 120 has strong elasticity because, although its length L is longer than the length L of the locking portion 120 in Figure 3, the angle θ2 between the locking portion 120 and the dashed line 3 is smaller than the angle θ1 shown in Figure 3, and therefore does not deform significantly while withstanding external forces.

[0229] In other words, the locking portion 120 is slightly expanded while its length L becomes slightly shorter.

[0230] Furthermore, because the locking portion 120 is highly elastic, it does not bend in the opposite direction to the inclined direction of the locking portion 120.

[0231] Furthermore, as shown in Figures 22 to 32, the stent 1000 for preventing displacement according to the second embodiment of the present invention comprises a main stent 200 having a first cylindrical body 210 in which wires 2 made of a superelastic shape memory alloy are woven together or intersected in a mesh-like manner to form a hollow cylindrical shape, and a number of first spaces 211 are formed between the wires 2.

[0232] Here, around the first space 211, a braided section in which the wires 2 are woven and an intersection section where the wires 2 cross are formed, forming a shape similar to a rhombus or the like.

[0233] Furthermore, the deviation prevention stent 1000 includes a second cylindrical body 310 in which wires 2 made of superelastic shape memory alloy are woven together or intersected in a mesh-like manner to form a hollow cylindrical shape, with a second space 311 formed between the wires 2; a first locking portion 320 formed on one side of the second cylindrical body 310, which expands in diameter as it moves away from the second cylindrical body 310; and a second locking portion 330 formed on one side of the first locking portion 320, which contracts in diameter as it moves away from the second cylindrical body 310. The first locking stent 300 is shorter in length than the main stent 200.

[0234] Here, the second cylindrical body 310 supports the first locking portion 320, while the first locking portion 320 supports the second locking portion 330.

[0235] Furthermore, after the first locking stent 300 is fitted to the outside of one of the main body stent 200, the first cylindrical body 210 and the second cylindrical body 310 are sewn together and connected by connecting thread 400.

[0236] Here, the connecting thread 400 is sewn in a strip-like manner to one end of the second cylindrical body 310 and to the portion adjacent to the second cylindrical body 310 and the first locking portion 320, connecting the second space 311 of the second cylindrical body 310 and the first space 211 of the first cylindrical body 210.

[0237] Furthermore, a gap d is formed between the first cylindrical body 210 and one end of the adjacent second locking portion 330.

[0238] In other words, the second locking portion 330 becomes free due to the gap d.

[0239] Furthermore, the diameter d2 of the second cylindrical body 310 is formed to be similar to the diameter d1 of the first cylindrical body 210.

[0240] In other words, the second cylindrical body 310 is interference-fitted to the first cylindrical body 210.

[0241] Furthermore, the main stent 200 may be equipped with a pull cord used when removing the stent.

[0242] Here, the pull cord is sewn in a strip-like manner to one of the first spaces 211 of the first cylindrical body 210.

[0243] Therefore, the procedure is performed by inserting a stent 1000 to prevent displacement into the narrowed or obstructed lesion site 1a in the internal lumen 1 of the human body, such as the bile duct, esophagus, urethra, or ureter, through a stent delivery system such as a catheter.

[0244] Then, as shown in FIG. 27, the anti-deviation stent 1000 expands the lesion site 1a while closely adhering to the internal cavity 1 in the body.

[0245] Here, the first locking portion 320 and the second locking portion 330 are inserted into and locked in the internal cavity 1.

[0246] Also, as shown in FIGS. 28 and 29, when the pressure of the body fluid moving along the internal cavity 1 in the body or an external force such as the swaying of the human body in the longitudinal direction of the internal cavity 1 is transmitted to the first locking portion 320 and the second locking portion 330, they are pressed by the internal cavity 1.

[0247] Here, the first locking portion 320 and the second locking portion 330 are further inserted into and locked in the internal cavity 1 in the body by expanding while shortening their lengths L1 and L2 respectively in the longitudinal direction of the first cylindrical body 210.

[0248] Also, since the second locking portion 330 is free by the interval d, it easily deform.

[0249] That is, when an external force is transmitted, the first locking portion 320 and the second locking portion 330 expand while being compressed.

[0250] Also, friction occurs between the first cylindrical body 210 and the second cylindrical body 310 with similar diameters d1 and d2 when an external force is generated.

[0251] Also, when the external force is interrupted, the first locking portion 320 and the second locking portion 330 return to their original states.

[0252] Also, as shown in FIG. 30, the anti-deviation stent 1000 is inserted and applied to the through-hole 1b of two adjacent internal cavities 1 in the body such as the biliary system, pancreas, gastrointestinal tract, and duodenum of the human body through a stent delivery system such as a catheter.

[0253] The stent 1000 then connects the through-holes 1b of two adjacent lumens 1 within the body.

[0254] Here, the first cylindrical body 210 is fitted into a pair of through holes 1b, and the first locking portion 320 and the second locking portion 330 are inserted into the lumen 1, with the second locking portion 330 being locked into the lumen 1.

[0255] Furthermore, as shown in Figures 31 and 32, the first locking portion 320 and the second locking portion 330 are pressed against by the internal lumen 1 when an external force, such as the shaking of the human body, is transmitted in a direction that intersects the longitudinal direction of the internal lumen 1 within the body.

[0256] Here, the first locking portion 320 and the second locking portion 330 expand in the longitudinal direction of the first cylindrical body 210, with their lengths L1 and L2 becoming shorter, and the second locking portion 330 locks into the internal lumen 1 of the body over an even wider area around the through hole 1b.

[0257] In other words, the first locking portion 320 and the second locking portion 330 expand while being compressed when an external force is transmitted.

[0258] Furthermore, when the external force is interrupted, the first locking portion 320 and the second locking portion 330 return to their original state.

[0259] Furthermore, as shown in Figures 33 to 36, in the first modified example of the second embodiment of the present invention, a pair of first locking stents 300 are fitted to the outside of the main stent 200 of the stent 1000, and then sewn together with connecting threads 400, so that the pair of second locking portions 330 face each other.

[0260] Therefore, as shown in Figures 33 and 34, the first locking portion 320 and the second locking portion 330 of the pair of first locking stents 300 located at the lesion site 1a are pressed by the lumen 1 when external forces such as the pressure of bodily fluids moving along the lumen 1 inside the body or the shaking of the human body are transmitted in the longitudinal direction of the lumen 1.

[0261] Here, the first locking portion 320 and the second locking portion 330 of the pair of first locking stents 300 are further inserted into and locked into the lumen 1 inside the body by expanding in the longitudinal direction of the first cylindrical body 210, with their respective lengths L1 and L2 decreasing.

[0262] In other words, the first locking portion 320 and the second locking portion 330 of the pair of first locking stents 300 expand while being compressed when an external force is transmitted to them.

[0263] Furthermore, as shown in Figures 35 and 36, the first locking portion 320 and the second locking portion 330 of the pair of first locking stents 300 are inserted into the two lumens 1, with the second locking portion 330 being locked around the through-hole 1b.

[0264] In other words, both sides of the stent 1000 for preventing deviation are locked and fixed around the through hole 1b.

[0265] Therefore, when an external force such as body movement is transmitted to the pair of first locking stents 300, the first locking portion 320 and the second locking portion 330 are pressed against the lumen 1 when an external force is transmitted in a direction that intersects the longitudinal direction of the lumen 1 inside the body.

[0266] Here, the first locking portion 320 and the second locking portion 330 of the pair of first locking stents 300 are expanded in the longitudinal direction of the first cylindrical body 210, with their lengths L1 and L2 respectively decreasing, and the second locking portion 330 is locked in close contact with the internal lumen 1 inside the body over an even wider area around the through hole 1b.

[0267] In other words, the first locking portion 320 and the second locking portion 330 of the pair of first locking stents 300 are compressed and expanded when an external force is transmitted to them.

[0268] Furthermore, as shown in Figures 37 to 39, the length L1 of the first locking portion 320 of the stent 1000 for preventing deviation, according to the second modification of the second embodiment of the present invention, is formed to be even longer than the length L2 of the second locking portion 330.

[0269] Here, the first locking portion 320 is formed with a length L1 that is even longer than the length L2 of the second locking portion 330, and therefore further supports the second locking portion 330.

[0270] In other words, the first locking portion 320 and the second locking portion 330 have strong elasticity.

[0271] Furthermore, as shown in Figure 38, the first locking portion 320 and the second locking portion 330 are pressed by the lumen 1 when external forces such as the movement of bodily fluids along the lumen 1 within the body or the shaking of the human body are transmitted in the longitudinal direction of the lumen 1.

[0272] However, since the second locking portion 330 is further supported by the first locking portion 320, it does not deform significantly while withstanding external forces.

[0273] Furthermore, since the length L1 of the first locking portion 320 is formed to be even longer than the length L2 of the second locking portion 330, it does not deform significantly while withstanding external forces.

[0274] In other words, the first locking portion 320 and the second locking portion 330 are slightly expanded while their lengths L1 and L2 become slightly shorter.

[0275] Furthermore, because the first locking portion 320 and the second locking portion 330 are highly elastic, they do not bend in the direction of the second cylindrical body 310.

[0276] Furthermore, as shown in Figure 39, the first locking portion 320 and the second locking portion 330 are pressed against by the internal lumen 1 when an external force, such as the shaking of the human body, is transmitted in a direction that intersects the longitudinal direction of the internal lumen 1 within the body.

[0277] However, since the second locking portion 330 is further supported by the first locking portion 320, it does not deform significantly while withstanding external forces.

[0278] Furthermore, since the length L1 of the first locking portion 320 is formed to be even longer than the length L2 of the second locking portion 330, it does not deform significantly while withstanding external forces.

[0279] In other words, the first locking portion 320 and the second locking portion 330 are slightly expanded while their lengths L1 and L2 become slightly shorter.

[0280] Furthermore, the second locking portion 330 is locked to the internal lumen 1 inside the body with even stronger pressure around the through hole 1b.

[0281] Furthermore, because the first locking portion 320 and the second locking portion 330 are highly elastic, they do not bend in the direction of the second cylindrical body 310.

[0282] Furthermore, as shown in Figure 40, the second locking portion 330 of the stent 1000 for preventing deviation, according to the third modification of the second embodiment of the present invention, is formed to be long enough to be in close contact with the first cylindrical body 210.

[0283] In other words, the second locking portion 330 is supported by the first cylindrical body 210.

[0284] Therefore, the second locking portion 330, supported by the first cylindrical body 210, withstands external forces transmitted in a direction intersecting the direction of fluid movement at the lesion site 1a.

[0285] In other words, the second locking portion 330 does not deform significantly.

[0286] Furthermore, as shown in Figure 41, the diameter d2 of the second cylindrical body 310 of the stent 1000 for preventing deviation, according to the fourth modified example of the second embodiment of the present invention, is formed to be larger than the diameter d1 of the first cylindrical body 210.

[0287] Therefore, when the first locking stent 300 is fitted to the outside of the main stent 100, the second cylindrical body 310 will no longer be locked to the first cylindrical body 210.

[0288] Furthermore, as shown in Figures 42 to 46, in the fifth modified example of the second embodiment of the present invention, the first cylindrical body 210 of the stent 1000 for preventing deviation is covered with a film portion 220, thereby closing the first space portion 211.

[0289] Here, the coating portion 220 is made of silicone or PU (polyurethane) material, but it may also be made of a variety of materials such as synthetic resins, which are synthetic polymers harmless to the human body such as PU and silicone, or natural resins, which are natural polymer compounds.

[0290] Furthermore, the first locking stent 300 is covered with a film portion 340 over its entire length, thereby closing the second space portion 311.

[0291] Here, the coating portion 340 is made of silicone or PU (polyurethane) material, but it may also be made of a variety of materials such as synthetic resins, which are synthetic polymers harmless to the human body such as PU and silicone, or natural resins, which are natural polymer compounds.

[0292] Therefore, the coating portions 220 and 340 prevent the lesion site 1a from being inserted into the first space 211 and the second space 311.

[0293] Furthermore, the coating portions 220 and 340 prevent bodily fluids from flowing out of the two adjacent lumens 1 inside the body.

[0294] Furthermore, as shown in Figure 47, in the sixth modified example of the second embodiment of the present invention, the first cylindrical body 210 of the stent 1000 for preventing deviation has a coating portion 220 formed on only a part, that is, only one part, so that only a part of the numerous first spaces 211 is closed.

[0295] In other words, the remaining portion of the first cylindrical body 210 on which the coating portion 220 is not formed is more flexible than the portion of the first cylindrical body 210 on which the coating portion 220 is formed.

[0296] Here, the coating portion 220 is made of silicone or PU (polyurethane) material, but it may also be made of a variety of materials such as synthetic resins, which are synthetic polymers harmless to the human body such as PU and silicone, or natural resins, which are natural polymer compounds.

[0297] Therefore, the stent 1000 for preventing displacement can be easily deformed to correspond to the shape of the curved lumen 1.

[0298] Furthermore, as shown in Figure 48, in the seventh modified example of the second embodiment of the present invention, the first cylindrical body 210 of the stent 1000 for preventing deviation has numerous coating portions 220 formed at predetermined intervals along its longitudinal direction, thereby closing only a portion of the numerous first spaces 211.

[0299] In other words, various parts of the first cylindrical body 210 become flexible between the numerous coated portions 220.

[0300] Here, the coating portion 220 is made of silicone or PU (polyurethane) material, but it may also be made of a variety of materials such as synthetic resins, which are synthetic polymers harmless to the human body such as PU and silicone, or natural resins, which are natural polymer compounds.

[0301] Therefore, the stent 1000 for preventing displacement can be easily deformed to correspond to the further curved shape of the lumen 1.

[0302] Furthermore, as shown in Figures 49 to 57, the eighth modified example of the second embodiment of the present invention provides a second locking stent 500 instead of the first locking stent 300.

[0303] Here, the length of the second locking stent 500 is formed to be shorter than that of the main stent 200.

[0304] Furthermore, the second locking stent 500 comprises a third cylindrical body 510 formed by weaving or intersecting wires 2 made of a superelastic shape memory alloy in a mesh-like manner to form a hollow cylindrical shape, with a third space 511 formed between the wires 2, and a locking portion 520 formed on one side of the third cylindrical body 510, with the diameter increasing as it moves away from the third cylindrical body 510, but with the edge portion 521 bent inward.

[0305] Here, around the third space 511, a braided section in which the wires 2 are woven and an intersection section where the wires 2 cross are formed, forming a shape similar to a rhombus or the like.

[0306] Furthermore, the third cylindrical body 510 supports the locking portion 520.

[0307] Furthermore, after the second locking stent 500 is fitted to the outside of one of the main body stent 200, the first cylindrical body 210 and the third cylindrical body 510 are sewn together and connected by connecting thread 400.

[0308] Here, the connecting thread 400 is sewn in a strip-like manner to one end of the third cylindrical body 510 and to the adjacent portion between the third cylindrical body 510 and the locking portion 520, connecting the third space 511 of the third cylindrical body 510 and the first space 211 of the first cylindrical body 210.

[0309] Furthermore, a gap D is formed between the first cylindrical body 210 and one end of the adjacent edge portion 521.

[0310] In other words, the edge 521 of the locking portion 520 becomes free due to the gap d.

[0311] Furthermore, the diameter d3 of the third cylindrical body 510 is formed to be similar to the diameter d1 of the first cylindrical body 210.

[0312] In other words, the third cylindrical body 510 is interference-fitted to the first cylindrical body 210.

[0313] Furthermore, a curved surface 522 is formed on the outer surface of a portion of the locking portion 520 that is located far from the first cylindrical body 210.

[0314] Furthermore, the angle θ between the third cylindrical body 510 and the edge 521 of the locking portion 520 is formed to be 20 to 40°, more precisely 22 to 33°, so that the elasticity of the locking portion 520 is increased.

[0315] Therefore, the procedure is performed by inserting a stent 1000 to prevent displacement into the narrowed or obstructed lesion site 1a in the internal lumen 1 of the human body, such as the bile duct, esophagus, urethra, or ureter, through a stent delivery system such as a catheter.

[0316] As shown in Figure 54, the stent 1000 for preventing dislodgement expands the lesion site 1a while adhering tightly to the lumen 1 inside the body.

[0317] Here, the locking portion 520 is inserted into the lumen 1 and locked in place.

[0318] Furthermore, the locking portion 520 is no longer sharply locked into the lumen 1 by the curved surface 522.

[0319] Furthermore, as shown in Figure 55, the locking portion 520 is pressed by the internal lumen 1 when pressure is applied by bodily fluids moving along the internal lumen 1, or when external forces such as body sway are transmitted in the longitudinal direction of the internal lumen 1.

[0320] Here, the locking portion 520 expands in the longitudinal direction of the first cylindrical body 210, with its length L decreasing, so that it is further inserted into the internal lumen 1 of the body and locked in place.

[0321] Furthermore, the edge portion 521 of the locking portion 520 is free to deform due to the spacing d.

[0322] In other words, when an external force is transmitted, the locking portion 520 expands while being compressed.

[0323] Furthermore, friction occurs between the first cylindrical body 210 and the third cylindrical body 510, which have similar diameters d1 and d3, when an external force is applied.

[0324] Furthermore, because the angle θ between the first cylindrical body 210 and the edge portion 521 is formed to be 20-40°, and the locking portion 520 has strong elasticity, the locking portion 520 does not bend in the direction of the third cylindrical body 510.

[0325] Furthermore, when the external force is interrupted, the locking portion 520 returns to its original state.

[0326] Furthermore, as shown in Figure 56, the procedure is performed by inserting a stent 1000 to prevent displacement into the through-holes 1b of two adjacent lumens 1 within the human body, such as the biliary tract, pancreas, gastrointestinal tract, and duodenum, via a stent delivery system such as a catheter.

[0327] The stent 1000 then connects the through-holes 1b of two adjacent lumens 1 within the body.

[0328] Here, the first cylindrical body 210 is fitted into a pair of through holes 1b, and the locking portion 520 is inserted into the lumen 1 and locked in place.

[0329] Furthermore, the locking portion 520 is no longer sharply locked into the lumen 1 by the curved surface 522.

[0330] Furthermore, as shown in Figure 57, when an external force such as body movement is transmitted to the locking portion 520 in a direction intersecting the longitudinal direction of the lumen 1 inside the body, the locking portion 520 is pressed by the lumen 1.

[0331] Here, the locking portion 520 expands in the longitudinal direction of the first cylindrical body 210, with its length L decreasing, and locks into the internal lumen 1 inside the body over a wider area around the through hole 1b.

[0332] In other words, when an external force is transmitted, the locking portion 520 expands while being compressed.

[0333] Furthermore, when the external force is interrupted, the locking portion 520 returns to its original state.

[0334] Furthermore, as shown in Figures 58 to 61, in the ninth modified example of the second embodiment of the present invention, the first locking stent 300 and the second locking stent 500 are fitted to the outside of the main stent 200 on both sides of the main stent 200, respectively, and then sewn together with a connecting thread 400, so that the second locking portion 330 and the locking portion 520 face each other.

[0335] Therefore, as shown in Figures 58 and 59, the first and second locking portions 320 and 330 of the first locking stent 300 and the locking portion 520 of the second locking stent 500, located at the lesion site 1a, are pressed against by the lumen 1 when external forces such as the pressure of bodily fluids moving along the lumen 1 within the body or the shaking of the human body are transmitted in the longitudinal direction of the lumen 1.

[0336] Here, the first and second locking portions 320 and 330 of the first locking stent 300 are further inserted into and locked into the lumen 1 inside the body by expanding in the longitudinal direction of the first cylindrical body 210, with their lengths L1 and L2 respectively becoming shorter.

[0337] Furthermore, the locking portion 520 of the second locking stent 500 is also expanded in the longitudinal direction of the first cylindrical body 210, with its length L decreasing, thereby being further inserted into the lumen 1 inside the body and locked in place.

[0338] In other words, the first and second locking portions 320 and 330 of the first locking stent 300 and the locking portion 520 of the second locking stent 500 are compressed and expanded when an external force is transmitted to them.

[0339] Furthermore, as shown in Figures 60 and 61, the first and second locking portions 320 and 330 of the first locking stent 300 and the locking portion 520 of the second locking stent 500 are inserted into the two lumens 1, respectively, while the second locking portion 330 and the locking portion 520 are locked around the through hole 1b.

[0340] In other words, both sides of the stent 1000 for preventing deviation are locked and fixed around the through hole 1b.

[0341] Therefore, when an external force such as shaking of the human body is transmitted to the first and second locking portions 320, 330 of the first locking stent 300 and the locking portion 520 of the second locking stent 500, the internal lumen 1 is pressed against the internal lumen 1 when an external force is transmitted in a direction that intersects the longitudinal direction of the internal lumen 1 within the body.

[0342] Here, the first and second locking portions 320 and 330 of the first locking stent 300 are expanded in the longitudinal direction of the first cylindrical body 210, with their lengths L1 and L2 respectively decreasing, and the second locking portion 330 is locked in close contact with the internal lumen 1 inside the body over an even wider area around the through hole 1b.

[0343] Furthermore, the locking portion 520 of the second locking stent 500 is also expanded in the longitudinal direction of the first cylindrical body 210, with its length L decreasing, and is locked in close contact with the internal lumen 1 inside the body over an even wider area around the through hole 1b.

[0344] In other words, the first and second locking portions 320 and 330 of the first locking stent 300 and the locking portion 520 of the second locking stent 500 are compressed and expanded when an external force is transmitted to them.

[0345] Furthermore, as shown in Figure 62, in the tenth modified example of the second embodiment of the present invention, a pair of second locking stents 500 are fitted to the outside of each side of the main stent 200 of the slippage prevention stent 1000, and then sewn together with connecting thread 400, so that the pair of locking portions 520 face each other.

[0346] Therefore, when the pair of locking parts 520 located at the lesion site 1a are subjected to the pressure of bodily fluids moving along the lumen 1 inside the body, or to the transmission of external forces such as body movement in the longitudinal direction of the lumen 1, the space between the pair of locking parts 520 and the first cylindrical body 210 expands, and the lumen 1 presses against them.

[0347] Here, the pair of locking portions 520 are further inserted into and locked into the internal lumen 1 of the body by expanding in the longitudinal direction of the first cylindrical body 210, with their respective lengths L decreasing.

[0348] In other words, when an external force is transmitted to each of the pair of locking portions 120, they are compressed and expanded simultaneously.

[0349] Furthermore, when the stent 1000 for preventing deviation is installed in the through hole 1b, the pair of locking parts 520 are locked to the periphery of the through hole 1b.

[0350] Therefore, when an external force such as shaking of the human body is transmitted to the pair of locking parts 520 in a direction that intersects the longitudinal direction of the internal lumen 1 within the body, the space between the pair of locking parts 520 and the first cylindrical body 210 expands, and the internal lumen 1 presses against them.

[0351] Here, the pair of locking portions 520 expand in the longitudinal direction of the first cylindrical body 210, with their respective lengths L decreasing, so that they are locked in close contact with the internal lumen 1 around the through hole 1b over a wider area.

[0352] In other words, when an external force is transmitted to each of the pair of locking portions 520, they are compressed and expanded.

[0353] Furthermore, as shown in Figure 63, the edge portion 521 of the locking portion 520 of the slippage prevention stent 1000 according to the 11th modified example of the second embodiment of the present invention is formed to be long enough to be in close contact with the first cylindrical body 210.

[0354] In other words, the edge 521 of the locking portion 520 is supported by the first cylindrical body 210.

[0355] Therefore, the locking portion 520 supported by the first cylindrical body 210 withstands the external force when an external force is transmitted in a direction intersecting the direction of movement of bodily fluids at the lesion site 1a.

[0356] In other words, the locking portion 520 does not deform significantly.

[0357] Furthermore, as shown in Figure 64, the diameter d3 of the third cylindrical body 310 of the deviation prevention stent 1000 according to the twelfth modified example of the second embodiment of the present invention is formed to be larger than the diameter d1 of the first cylindrical body 210.

[0358] Therefore, when the second locking stent 500 is fitted to the outside of the main stent 100, the third cylindrical body 510 will no longer be locked to the first cylindrical body 210.

[0359] Furthermore, as shown in Figures 65 and 66, the second locking stent 500 of the deviation prevention stent 1000 according to the 13th modification of the second embodiment of the present invention has a coating portion 530 formed over its entire surface, thereby closing the third space portion 511.

[0360] Here, the coating portion 530 is made of silicone or PU (polyurethane) material, but it may also be made of a variety of materials such as synthetic resins, which are synthetic polymers harmless to the human body such as PU and silicone, or natural resins, which are natural polymer compounds.

[0361] Therefore, the coating portion 530 prevents the lesion site 1a from being inserted into the third space portion 511.

[0362] Furthermore, the coating portion 530 prevents bodily fluids from flowing out of the two adjacent lumens 1 inside the body.

[0363] Furthermore, as shown in Figure 67, the length L of the locking portion 520 of the stent 1000 for preventing deviation, according to the 14th modification of the second embodiment of the present invention, is formed to be even longer in the longitudinal direction of the first cylindrical body 210.

[0364] Here, the length L of the locking portion 520 is formed to be even longer than the length L of the locking portion 520 in Figure 53.

[0365] Furthermore, as shown in Figures 53 and 67, a dashed line 3 is located at one end of the locking portion 520 that is furthest from the first cylindrical body 210, parallel to the first cylindrical body 210.

[0366] Therefore, the angle θ2 between the locking portion 520 and the dashed line 3 shown in Figure 67 is formed to be smaller than the angle θ1 shown in Figure 53.

[0367] In other words, the locking portion 520 has strong elasticity.

[0368] Therefore, when an external force is transmitted, the locking portion 520 is pressed by the lumen 1.

[0369] However, the locking portion 520 is formed with a length L that is even longer than the length L of the locking portion 520 in Figure 53, while the angle θ2 between the locking portion 520 and the dashed line 3 is formed to be smaller than the angle θ1 shown in Figure 53. As a result, it has strong elasticity and does not deform significantly while withstanding external forces.

[0370] In other words, the locking portion 520 is slightly expanded while its length L becomes slightly shorter.

[0371] Furthermore, because the locking portion 520 is highly elastic, it does not bend in the direction of the third cylindrical body 510.

[0372] Furthermore, as shown in Figures 68 to 77, the stent 1000 for preventing deviation according to the third embodiment of the present invention comprises a main stent 600 having a locking portion 620 formed on one side, and a first locking stent 700 connected to the opposite side of the main stent 600 by a connecting thread 400.

[0373] Furthermore, the main stent 600 comprises a first cylindrical body 610 in which wires 2 made of a superelastic shape memory alloy are woven together or intersected in a mesh-like manner to form a hollow cylindrical shape, and a number of first spaces 611 are formed between the wires 2.

[0374] Here, around the first space 611, a braided section in which the wires 2 are woven and an intersection section where the wires 2 cross are formed, forming a shape similar to a rhombus or the like.

[0375] Furthermore, the main stent 600 includes a locking portion 620 formed on one side of the first cylindrical body 610, where a part of the first cylindrical body 610 protrudes outward in a ring shape and is inclined toward the opposite side of the first cylindrical body 610.

[0376] Here, the angle θ between the first cylindrical body 610 and the locking portion 620 is formed to be 20 to 40°, more precisely 22 to 33°, so that the elasticity of the locking portion 620 is increased.

[0377] Furthermore, a curved surface 621 is formed on the outer surface of a portion of the locking portion 620 that is located far from the first cylindrical body 610.

[0378] Furthermore, the locking portion 620 is formed adjacent to one end of the first cylindrical body 610.

[0379] Furthermore, the first cylindrical body 610 is manufactured and heat-treated using at least one wire 2, and consists of a main stent 600.

[0380] Furthermore, the first locking stent 700 comprises a second cylindrical body 710 formed by weaving or intersecting wires 2 made of a superelastic shape memory alloy in a mesh-like manner to form a hollow cylindrical shape, with a second space 711 formed between the wires 2; a first locking portion 720 formed on one side of the second cylindrical body 710, which expands in diameter as it moves away from the second cylindrical body 710; and a second locking portion 730 formed on one side of the first locking portion 720, which contracts in diameter as it moves away from the second cylindrical body 710.

[0381] Here, the first locking stent 700 is formed to be shorter in length than the main stent 600.

[0382] Furthermore, the second cylindrical body 710 supports the first locking portion 720, while the first locking portion 720 supports the second locking portion 730.

[0383] Furthermore, around the second space 711, a braided section in which the wires 2 are woven, and an intersection section where the wires 2 cross, are formed, forming a shape similar to a rhombus or the like.

[0384] Furthermore, on one side opposite the main stent 600, the first locking stent 700 is fitted to the outside, and then the first cylindrical body 610 and the second cylindrical body 710 are sewn together with connecting thread 400, so that the locking portion 620 and the second locking portion 730 face each other.

[0385] Here, the connecting thread 400 is sewn in a strip-like manner to one end of the second cylindrical body 710 and to the portion adjacent to the second cylindrical body 710 and the first locking portion 720, between the second space 711 of the second cylindrical body 710 and the first space 611 of the first cylindrical body 610.

[0386] Furthermore, a gap d is formed between the first cylindrical body 610 and one end of the adjacent second locking portion 730.

[0387] In other words, the second locking portion 730 becomes free due to the gap d.

[0388] Furthermore, the diameter d2 of the second cylindrical body 710 is formed to be similar to the diameter d1 of the first cylindrical body 610.

[0389] In other words, the second cylindrical body 710 is interference-fitted to the first cylindrical body 610.

[0390] Furthermore, the main stent 600 may be equipped with a pull cord used when removing the stent.

[0391] Here, the pull cord is sewn in a strip-like manner to one of the first spaces 611 of the first cylindrical body 610.

[0392] Therefore, the procedure is performed by inserting a stent 1000 to prevent displacement into the narrowed or obstructed lesion site 1a in the internal lumen 1 of the human body, such as the bile duct, esophagus, urethra, or ureter, through a stent delivery system such as a catheter.

[0393] As shown in Figure 74, the stent 1000 for preventing dislodgement expands the lesion site 1a while adhering tightly to the lumen 1 inside the body.

[0394] Here, the locking portion 620 and the first and second locking portions 720 and 730 are inserted into the lumen 1 and locked.

[0395] Furthermore, the locking portion 620 is no longer sharply locked into the lumen 1 by the curved surface 621.

[0396] Furthermore, as shown in Figure 75, when the locking portion 620 is subjected to the pressure of bodily fluids moving along the internal lumen 1 within the body, or external forces such as body swaying transmitted in the longitudinal direction of the internal lumen 1, the gap between the locking portion 620 and the first cylindrical body 610 widens as the locking portion 620 is pressed by the internal lumen 1 within the body.

[0397] Here, the locking portion 620 expands in the longitudinal direction of the first cylindrical body 610, with its length L decreasing, so that it is further inserted into the internal lumen 1 of the body and locked in place.

[0398] In other words, when an external force is transmitted, the locking portion 620 expands while being compressed.

[0399] Furthermore, because the angle θ between the first cylindrical body 610 and the locking portion 620 is formed to be 20 to 40° and the locking portion 620 has strong elasticity, the locking portion 620 does not bend in the opposite direction to the inclined direction.

[0400] Furthermore, the first locking portion 720 and the second locking portion 730 are also pressed by the lumen 1 when external forces such as the pressure of bodily fluids moving along the lumen 1 within the body or the shaking of the human body are transmitted in the longitudinal direction of the lumen 1.

[0401] Here, the first locking portion 720 and the second locking portion 730 are further inserted into the internal lumen 1 of the body and locked in place by expanding in the longitudinal direction of the first cylindrical body 610, with their respective lengths L1 and L2 decreasing.

[0402] Furthermore, the second locking portion 730 is free to deform due to the spacing D.

[0403] In other words, when an external force is transmitted, the first locking portion 720 and the second locking portion 730 are compressed and expanded.

[0404] Furthermore, friction occurs between the first cylindrical body 610 and the second cylindrical body 710, which have similar diameters d1 and d2, when an external force is applied.

[0405] Furthermore, when the external force is interrupted, the locking portion 620 and the first and second locking portions 720 and 730 return to their original state.

[0406] Furthermore, the procedure is performed by inserting a stent 1000 to prevent displacement into the perforations 1b of two adjacent lumens 1 within the human body, such as the biliary tract, pancreas, gastrointestinal tract, and duodenum, via a stent delivery system such as a catheter.

[0407] As shown in Figure 76, the stent 1000 prevents displacement by connecting the through-holes 1b of two adjacent lumens 1 within the body.

[0408] Here, the first cylindrical body 610 is fitted into a pair of through holes 1b, the locking portion 620 is inserted into and locked in one lumen 1, and the first locking portion 720 and the second locking portion 730 are inserted into the remaining lumen 1, with the second locking portion 730 being locked in the remaining lumen 1.

[0409] Furthermore, the locking portion 620 is no longer sharply locked into the lumen 1 by the curved surface 621.

[0410] Furthermore, as shown in Figure 77, when an external force such as body movement is transmitted to the locking portion 620 in a direction intersecting the longitudinal direction of the internal lumen 1 within the body, the gap between the locking portion 620 and the first cylindrical body 610 widens as the locking portion 620 is pressed by the internal lumen 1 within the body.

[0411] Here, the locking portion 620 expands in the longitudinal direction of the first cylindrical body 610, with its length L decreasing, so that it is locked to the internal lumen 1 inside the body over a wider area around the through hole 1b.

[0412] In other words, when an external force is transmitted, the locking portion 620 expands while being compressed.

[0413] Furthermore, because the angle θ between the first cylindrical body 610 and the locking portion 620 is formed to be 20 to 40° and the locking portion 620 has strong elasticity, the locking portion 620 does not bend in the opposite direction to the inclined direction.

[0414] Furthermore, the first locking portion 720 and the second locking portion 730 are also pressed by the internal lumen 1 when an external force, such as the shaking of the human body, is transmitted in a direction that intersects the longitudinal direction of the internal lumen 1 within the body.

[0415] Here, the first locking portion 720 and the second locking portion 730 expand in the longitudinal direction of the first cylindrical body 610, with their lengths L1 and L2 becoming shorter, and the second locking portion 730 locks into contact with the internal lumen 1 inside the body over an even wider area around the through hole 1b.

[0416] In other words, when an external force is transmitted, the first locking portion 720 and the second locking portion 730 are compressed and expanded.

[0417] Furthermore, when the external force is interrupted, the locking portion 620 and the first and second locking portions 720 and 730 return to their original state.

[0418] Furthermore, as shown in Figure 78, a projection 630 is provided at one end of the first cylindrical body 610 of the stent 1000 for preventing deviation according to the first modification of the third embodiment of the present invention.

[0419] Here, the protruding portion 630 is provided protruding from one end of the first cylindrical body 610 adjacent to the locking portion 620, and therefore supports the locking portion 620.

[0420] Furthermore, the first locking stent 700 is sewn to the main stent 600 by connecting thread 400 such that the first cylindrical body 610 protrudes only by the protruding portion 630 from the second cylindrical body 710.

[0421] Furthermore, as shown in Figures 79 to 83, in the second modified example of the third embodiment of the present invention, the first cylindrical body 610 of the stent 1000 for preventing deviation is covered with a film portion 640, thereby closing the first space portion 611.

[0422] Here, the coating portion 640 is made of silicone or PU (polyurethane) material, but it may also be made of a variety of materials such as synthetic resins, which are synthetic polymers harmless to the human body such as PU and silicone, or natural resins, which are natural polymer compounds.

[0423] Furthermore, the first locking stent 700 is covered with a film portion 740, thereby closing the second space portion 711.

[0424] Here, the coating portion 740 is made of silicone or PU (polyurethane) material, but it may also be made of a variety of materials such as synthetic resins, which are synthetic polymers harmless to the human body such as PU and silicone, or natural resins, which are natural polymer compounds.

[0425] Therefore, the coating portions 640 and 740 prevent the lesion site 1a from being inserted into the first and second spaces 611 and 711.

[0426] Furthermore, the coating portions 640 and 740 prevent bodily fluids from flowing out of the two adjacent lumens 1 inside the body.

[0427] Furthermore, as shown in Figure 84, in the third modified example of the third embodiment of the present invention, the first cylindrical body 610 of the stent 1000 for preventing deviation has a coating portion 640 formed on only a part, that is, only one part, so that only a part of the numerous first spaces 611 is closed.

[0428] In other words, the remaining portion of the first cylindrical body 610 on which the coating portion 640 is not formed is more flexible than the portion of the first cylindrical body 610 on which the coating portion 640 is formed.

[0429] Here, the coating portion 640 is made of silicone or PU (polyurethane) material, but it may also be made of a variety of materials such as synthetic resins, which are synthetic polymers harmless to the human body such as PU and silicone, or natural resins, which are natural polymer compounds.

[0430] Therefore, the stent 1000 for preventing displacement can be easily deformed to correspond to the shape of the curved lumen 1.

[0431] Furthermore, as shown in Figure 85, in the fourth modification of the third embodiment of the present invention, the first cylindrical body 610 of the stent 1000 for preventing deviation has numerous coating portions 640 formed at predetermined intervals along its longitudinal direction, thereby closing only a portion of the numerous first spaces 611.

[0432] In other words, various parts of the first cylindrical body 610 become flexible between the numerous coated portions 640.

[0433] Here, the coating portion 640 is made of silicone or PU (polyurethane) material, but it may also be made of a variety of materials such as synthetic resins, which are synthetic polymers harmless to the human body such as PU and silicone, or natural resins, which are natural polymer compounds.

[0434] Therefore, the stent 1000 for preventing displacement can be easily deformed to correspond to the further curved shape of the lumen 1.

[0435] Furthermore, as shown in Figures 86 and 87, in the fifth modified example of the third embodiment of the present invention, a blocking portion 641 is provided protruding from the coating portion 640 on the inner surface of the first cylindrical body 610 of the stent 1000 for preventing deviation.

[0436] Here, the blocking portion 641 is projected from the coating portion 640 toward the center of the first cylindrical body 610.

[0437] Therefore, the blocking section 641 prevents internal substances such as food and drink from flowing back in the opposite direction to the flow of bodily fluids.

[0438] Furthermore, as shown in Figure 88, the length L1 of the locking portion 620 of the stent 1000 for preventing deviation, according to the sixth modification of the third embodiment of the present invention, is formed to be even longer in the longitudinal direction of the first cylindrical body 610.

[0439] Here, the length L of the locking portion 620 is formed to be even longer than the length L of the locking portion 620 in Figure 72.

[0440] Furthermore, as shown in Figures 72 and 88, a dashed line 3 is located at one end of the locking portion 620 that is furthest from the first cylindrical body 610, parallel to the first cylindrical body 610.

[0441] Therefore, the angle θ2 between the locking portion 620 and the dashed line 3 shown in Figure 88 is formed to be smaller than the angle θ1 shown in Figure 3.

[0442] In other words, the locking portion 620 has strong elasticity.

[0443] Therefore, when an external force is transmitted, the locking portion 620 is pressed by the lumen 1.

[0444] However, the locking portion 620 has strong elasticity because, although its length L is longer than that of the locking portion 620 in Figure 72, the angle θ2 between the locking portion 620 and the dashed line 3 is smaller than the angle θ1 shown in Figure 72, and therefore does not deform significantly while withstanding external forces.

[0445] In other words, the locking portion 620 is slightly expanded while its length L becomes slightly shorter.

[0446] Furthermore, because the locking portion 620 is highly elastic, it does not bend in the opposite direction to the inclined direction of the locking portion 620.

[0447] Furthermore, as shown in Figures 89 to 91, the length L1 of the first locking portion 720 of the stent 1000 for preventing deviation, according to the seventh modification of the third embodiment of the present invention, is formed to be even longer than the length L2 of the second locking portion 730.

[0448] Here, the first locking portion 720 is formed with a length L1 that is even longer than the length L2 of the second locking portion 730, and therefore further supports the second locking portion 730.

[0449] In other words, the first locking portion 720 and the second locking portion 730 have strong elasticity.

[0450] Furthermore, as shown in Figure 90, the first locking portion 720 and the second locking portion 730 are pressed by the lumen 1 when external forces such as the movement of bodily fluids moving along the lumen 1 within the body or the shaking of the human body are transmitted in the longitudinal direction of the lumen 1.

[0451] However, since the second locking portion 730 is further supported by the first locking portion 720, it does not deform significantly while withstanding external forces.

[0452] Furthermore, since the length L1 of the first locking portion 720 is formed to be even longer than the length L2 of the second locking portion 730, it does not deform significantly while withstanding external forces.

[0453] In other words, the first locking portion 720 and the second locking portion 730 are slightly expanded while their lengths L1 and L2 become slightly shorter.

[0454] Furthermore, because the first locking portion 720 and the second locking portion 730 are highly elastic, they do not bend in the direction of the second cylindrical body 710.

[0455] Furthermore, as shown in Figure 91, the first locking portion 720 and the second locking portion 730 are pressed against by the internal lumen 1 when an external force, such as the shaking of the human body, is transmitted in a direction that intersects the longitudinal direction of the internal lumen 1 within the body.

[0456] However, since the second locking portion 730 is further supported by the first locking portion 720, it does not deform significantly while withstanding external forces.

[0457] Furthermore, since the length L1 of the first locking portion 720 is formed to be even longer than the length L2 of the second locking portion 730, it does not deform significantly while withstanding external forces.

[0458] In other words, the first locking portion 720 and the second locking portion 730 are slightly expanded while their lengths L1 and L2 become slightly shorter.

[0459] Furthermore, the second locking portion 730 is locked to the internal lumen 1 inside the body with even stronger pressure around the through hole 1b.

[0460] Furthermore, because the first and second locking parts 720 and 730 are highly elastic, they do not bend in the direction of the second cylindrical body 710.

[0461] Furthermore, as shown in Figure 92, the second locking portion 730 of the stent 1000 for preventing deviation, according to the eighth modified example of the third embodiment of the present invention, is formed to be long enough to be in close contact with the first cylindrical body 610.

[0462] In other words, the second locking portion 730 is supported by the first cylindrical body 610.

[0463] Therefore, the second locking portion 730, supported by the first cylindrical body 610, withstands external forces transmitted in a direction intersecting the direction of fluid movement at the lesion site 1a.

[0464] In other words, the second locking portion 730 does not deform significantly.

[0465] Furthermore, as shown in Figure 93, the diameter d2 of the second cylindrical body 710 of the deviation prevention stent 1000 according to the ninth modified example of the third embodiment of the present invention is formed to be larger than the diameter d1 of the first cylindrical body 610.

[0466] Therefore, when the first locking stent 700 is fitted to the outside of the main stent 600, the second cylindrical body 710 will no longer be locked to the first cylindrical body 610.

[0467] Furthermore, as shown in Figures 94 to 101, the stent 1000 for preventing deviation according to the 10th modification of the third embodiment of the present invention includes a second locking stent 800 instead of the first locking stent 700.

[0468] Here, the length of the second locking stent 800 is formed to be shorter than that of the main stent 600.

[0469] Furthermore, the second locking stent 800 comprises a third cylindrical body 810 formed by weaving or intersecting wires 2 made of a superelastic shape memory alloy in a mesh-like manner to form a hollow cylindrical shape, with a third space 811 formed between the wires 2, and a locking portion 820 formed by expanding the diameter of one side of the third cylindrical body 810 as it moves away from the third cylindrical body 810, with an edge portion 821 bent inward.

[0470] Here, around the third space 811, a braided section in which the wires 2 are woven and an intersection section where the wires 2 cross are formed, forming a shape similar to a rhombus or the like.

[0471] Furthermore, the third cylindrical body 810 supports the locking portion 820.

[0472] Furthermore, on one side opposite the main stent 600, the second locking stent 800 is fitted to the outside, and then the first cylindrical body 610 and the third cylindrical body 810 are sewn together with connecting thread 400, so that the locking parts 620 and 820 face each other.

[0473] Here, the connecting thread 400 is sewn in a strip-like manner to one end of the third cylindrical body 810 and to the adjacent portion between the third cylindrical body 810 and the locking portion 820, connecting the third space 811 of the third cylindrical body 810 and the first space 611 of the first cylindrical body 610.

[0474] Furthermore, a gap d is formed between the first cylindrical body 610 and one end of the adjacent edge portion 821.

[0475] In other words, the edge 821 of the locking portion 820 becomes free due to the gap d.

[0476] Furthermore, the diameter d3 of the third cylindrical body 810 is formed to be similar to the diameter d1 of the first cylindrical body 610.

[0477] In other words, the third cylindrical body 810 is interference-fitted to the first cylindrical body 610.

[0478] Furthermore, a curved surface 822 is formed on the outer surface of a portion of the locking portion 820 that is located far from the first cylindrical body 610.

[0479] Furthermore, the angle θ between the third cylindrical body 810 and the edge 821 of the locking portion 820 is formed to be 20 to 40°, more precisely 22 to 33°, so that the elasticity of the locking portion 820 is increased.

[0480] Therefore, the procedure is performed by inserting a stent 1000 to prevent displacement into the narrowed or obstructed lesion site 1a in the internal lumen 1 of the human body, such as the bile duct, esophagus, urethra, or ureter, through a stent delivery system such as a catheter.

[0481] As shown in Figure 98, the stent 1000 for preventing dislodgement expands the lesion site 1a while adhering tightly to the lumen 1 inside the body.

[0482] Here, the locking portion 820 is inserted into the lumen 1 and locked in place.

[0483] Furthermore, the locking portion 820 is no longer sharply locked into the lumen 1 by the curved surface 822.

[0484] Furthermore, the locking portion 620 of the main stent 600 is also inserted into the lumen 1 and locked in place.

[0485] Furthermore, as shown in Figure 99, the locking portion 820 is pressed by the lumen 1 when external forces such as the movement of bodily fluids along the lumen 1 within the body or the shaking of the human body are transmitted in the longitudinal direction of the lumen 1.

[0486] Here, the locking portion 820 expands in the longitudinal direction of the first cylindrical body 610, with its length L decreasing, thereby being further inserted into the internal lumen 1 of the body and locked in place.

[0487] Furthermore, the edge portion 821 of the locking portion 820 is free to deform due to the spacing d.

[0488] In other words, when an external force is transmitted, the locking portion 820 is compressed and expanded, and the locking portion 620 of the main stent 600 is also compressed and expanded when an external force is transmitted.

[0489] Furthermore, friction occurs between the first cylindrical body 610 and the third cylindrical body 810, which have similar diameters d1 and d3, when an external force is applied.

[0490] Furthermore, since the angle θ between the first cylindrical body 610 and the edge portion 821 is formed to be 20 to 40°, and the locking portion 820 has strong elasticity, the locking portion 820 does not bend in the direction of the third cylindrical body 810.

[0491] Furthermore, when the external force is interrupted, the locking portion 820 returns to its original state.

[0492] Furthermore, the locking portion 620 of the main stent 600 also returns to its original state when the external force is interrupted.

[0493] Furthermore, as shown in Figure 100, the procedure is performed by inserting a stent 1000 to prevent displacement into the through-holes 1b of two adjacent lumens 1 within the human body, such as the biliary tract, pancreas, gastrointestinal tract, and duodenum, via a stent delivery system such as a catheter.

[0494] The stent 1000 then connects the through-holes 1b of two adjacent lumens 1 within the body.

[0495] Here, the locking portion 820 is inserted into the lumen 1 and locked in place.

[0496] Furthermore, the locking portion 820 is no longer sharply locked into the lumen 1 by the curved surface 822.

[0497] Furthermore, the locking surface 620 of the main stent 600 is also inserted into the lumen 1 and locked in place.

[0498] Furthermore, as shown in Figure 101, when an external force such as body movement is transmitted to the locking portion 820 in a direction intersecting the longitudinal direction of the lumen 1 inside the body, the locking portion 820 is pressed by the lumen 1.

[0499] Here, the locking portion 820 expands in the longitudinal direction of the first cylindrical body 610, with its length L decreasing, and locks into the internal lumen 1 inside the body over a wider area around the through hole 1b.

[0500] In other words, when an external force is transmitted, the locking portion 820 is compressed and expanded, and the locking portion 620 of the main stent 600 is also compressed and expanded when an external force is transmitted.

[0501] Furthermore, when the external force is interrupted, the locking portion 820 returns to its original state.

[0502] Furthermore, the locking portion 620 of the main stent 600 also returns to its original state when the external force is interrupted.

[0503] Furthermore, as shown in Figure 102, the edge portion 821 of the locking portion 820 of the stent 1000 for preventing deviation, according to the 11th modified example of the third embodiment of the present invention, is formed to be long enough to be in close contact with the first cylindrical body 610.

[0504] In other words, the edge 821 of the locking portion 820 is supported by the first cylindrical body 610.

[0505] Therefore, the locking portion 820 supported by the first cylindrical body 610 withstands the external force when an external force is transmitted in a direction intersecting the direction of movement of bodily fluids at the lesion site 1a.

[0506] In other words, the locking portion 820 does not deform significantly.

[0507] Furthermore, as shown in Figure 103, the diameter d3 of the third cylindrical body 810 of the deviation prevention stent 1000 according to the twelfth modified example of the third embodiment of the present invention is formed to be larger than the diameter d1 of the first cylindrical body 610.

[0508] Therefore, when the second locking stent 800 is fitted to the outside of the main stent 600, the third cylindrical body 810 will no longer be locked to the first cylindrical body 610.

[0509] Furthermore, as shown in Figures 104 and 105, the second locking stent 800 of the deviation prevention stent 1000 according to the 13th modification of the third embodiment of the present invention has a coating portion 830 formed on its entire surface, thereby closing the third space portion 811.

[0510] Here, the coating portion 830 is made of silicone or PU (polyurethane) material, but it may also be made of a variety of materials such as synthetic resins, which are synthetic polymers harmless to the human body such as PU and silicone, or natural resins, which are natural polymer compounds.

[0511] Therefore, the coating portion 830 prevents the lesion site 1a from being inserted into the third space portion 811.

[0512] Furthermore, the coating portion 830 prevents bodily fluids from flowing out of the two adjacent lumens 1 inside the body.

[0513] Furthermore, as shown in Figure 106, the length L of the locking portion 820 of the stent 1000 for preventing deviation, according to the 14th modification of the third embodiment of the present invention, is formed to be even longer in the longitudinal direction of the first cylindrical body 610.

[0514] Here, the length L of the locking portion 820 is formed to be even longer than the length L of the locking portion 820 in Figure 97.

[0515] Furthermore, as shown in Figures 97 and 106, a dashed line 3 is located at one end of the locking portion 820 that is furthest from the first cylindrical body 610, parallel to the first cylindrical body 610.

[0516] Therefore, the angle θ2 between the locking portion 820 and the dashed line 3 shown in Figure 106 is formed to be smaller than the angle θ1 shown in Figure 97.

[0517] In other words, the locking portion 820 has strong elasticity.

[0518] Therefore, when an external force is transmitted, the locking portion 820 is pressed by the lumen 1.

[0519] However, the locking portion 820 has strong elasticity because, although its length L is longer than the length L of the locking portion 820 in Figure 97, the angle θ2 between the locking portion 820 and the dashed line 3 is smaller than the angle θ1 shown in Figure 97, and therefore does not deform significantly while withstanding external forces.

[0520] In other words, the locking portion 820 is slightly expanded while its length L becomes slightly shorter.

[0521] Furthermore, because the locking portion 820 is highly elastic, it does not bend in the direction of the third cylindrical body 810.

[0522] Although the present invention has been illustrated and described above with reference to specific preferred embodiments, the present invention is not limited to the embodiments described above, and various modifications and alterations can be made by persons with ordinary skill in the art to which the invention pertains without departing from the spirit of the invention. [Explanation of symbols]

[0523] 100 Cylindrical body 110 Space section 120 Locking part 121 Curved surface 130 Protrusion 140 Coating section 141 Shut-off section 200 Main Stent 210 First cylindrical body 211 1st space part 220 Coating section 300 First locking stent 310 Second cylindrical body 311 Second space 320 First locking part 330 Second locking part 340 Coating part 400 connecting threads 500 Second locking stent 510 Third cylindrical body 511 Third space 520 Locking part 521 Edge 522 Curved surface 530 Coating part 600 Main Stent 610 First cylindrical body 611 1st space part 620 Locking part 621 Curved surface 630 Protrusion 640 Coating section 700 First Locking Stent 710 Second cylindrical body 711 Second space 720 First locking part 730 Second locking section 740 Coating section 800 Second locking stent 810 Third cylindrical body 811 Third space 820 Locking part 821 Edge 822 Curved surface 830 Coating part 1000 Stents for preventing deviation

Claims

1. A stent for preventing displacement that expands a narrowed or obstructed lesion site (1a) in a lumen (1) inside the body, or connects through-holes (1b) formed in two adjacent lumens (1) inside the body, The device comprises a cylindrical body (100) in which wires (2) made of a superelastic shape memory alloy are woven together or intersected in a mesh-like manner to form a hollow cylindrical shape, and a number of spaces (110) are formed between the wires (2), One side of the cylindrical body (100) has a locking portion (120) formed thereon, which protrudes outward in a ring shape from a part of the cylindrical body (100) and tilts toward the opposite side of the cylindrical body (100), and is either locked into the lumen (1) where the lesion site (1a) has occurred, or inserted into the lumen (1) where a through hole (1b) has been formed and locked around the periphery of the through hole (1b). A stent for preventing displacement, characterized in that the locking portion (120) expands while its length (L) decreases in the longitudinal direction of the cylindrical body (100) when an external force is transmitted.

2. The stent for preventing deviation according to claim 1, characterized in that the locking portion (120) is further formed on one of the opposite sides of the cylindrical body (100) and is inclined toward the one side of the cylindrical body (100).

3. The stent for preventing deviation according to claim 1, characterized in that the angle (θ) between the cylindrical body (100) and the locking portion (120) is 20 to 40°.

4. The stent for preventing deviation according to claim 1, characterized in that a protruding portion (130) is provided at one end of the cylindrical body (100).

5. The stent for preventing deviation according to claim 4, characterized in that the protruding portions (130) are provided protruding from both ends of the cylindrical body (100).

6. The stent for preventing deviation according to claim 1, characterized in that the cylindrical body (100) has a coating portion (140) formed over its entire surface.

7. The stent for preventing deviation according to claim 1, characterized in that a coating portion (140) is formed on a part of the cylindrical body (100).

8. The stent for preventing deviation according to claim 1, characterized in that the cylindrical body (100) has a large number of coating portions (140) formed at predetermined intervals along its longitudinal direction.

9. The stent for preventing deviation according to claim 6, claim 7, or claim 8, characterized in that the coating portion (140) is made of silicone or PU (polyurethane) material.

10. A stent for preventing deviation according to claim 6, claim 7, or claim 8, characterized in that a blocking portion (141) is provided protruding from the coated portion (140) on the inner surface of the cylindrical body (100).

11. The stent for preventing deviation according to claim 1, characterized in that a curved surface (121) is formed on the outer surface of a portion of the locking portion (120) located far from the cylindrical body (100).

12. The stent for preventing deviation according to claim 1, characterized in that the length (L) of the locking portion (120) is formed to be even longer.

13. A stent for preventing displacement that expands a narrowed or obstructed lesion site (1a) in a lumen (1) inside the body, or connects through-holes (1b) formed in two adjacent lumen (1) inside the body, A main stent (200) having a first cylindrical body (210) in which wires (2) made of a superelastic shape memory alloy are woven together or intersected in a mesh-like manner to form a hollow cylindrical shape, and a number of first spaces (211) are formed between the wires (2), The device comprises a first locking stent (300) which is shorter in length than the main stent (200), and includes a second cylindrical body (310) in which the wires (2) made of a superelastic shape memory alloy are woven together or intersected to form a hollow cylindrical shape, and a second space (311) is formed between the wires (2); a first locking portion (320) formed on one side of the second cylindrical body (310) which expands in diameter as it moves away from the second cylindrical body (310); and a second locking portion (330) formed on one side of the first locking portion (320) which contracts in diameter as it moves away from the second cylindrical body (310). One of the main body stent (200) is fitted with a first locking stent (300) on the outside, and then the first cylindrical body (210) and the second cylindrical body (310) are sewn together and connected by a connecting thread (400). When the first locking portion (320) and the second locking portion (330) are inserted into the lumen (1) where the lesion site (1a) has occurred, they lock into the lumen (1), and when inserted into the lumen (1) where a through hole (1b) has been formed, the second locking portion (330) locks around the through hole (1b). A stent for preventing displacement, characterized in that when the first locking portion (320) and the second locking portion (330) receive an external force, the first locking portion (320) expands while its length (L1) decreases in the longitudinal direction of the first cylindrical body (210), and the second locking portion (330) expands while its length (L2) decreases in the longitudinal direction of the first cylindrical body (210).

14. The stent for preventing deviation according to claim 13, characterized in that a pair of first locking stents (300) are fitted to the outside of each side of the main stent (200), and are then sewn together with connecting threads (400), and a pair of second locking portions (330) face each other.

15. The stent for preventing deviation according to claim 13, characterized in that the length (L1) of the first locking portion (320) is formed to be even longer than the length (L2) of the second locking portion (330).

16. The stent for preventing deviation according to claim 13, characterized in that the second locking portion (330) is in close contact with the first cylindrical body (210).

17. The stent for preventing deviation according to claim 13, characterized in that a gap (d) is formed between the first cylindrical body (210) and one end of the adjacent second locking portion (330).

18. The stent for preventing deviation according to claim 13, characterized in that the diameter (d2) of the second cylindrical body (310) is similar to the diameter (d1) of the first cylindrical body (210).

19. The stent for preventing deviation according to claim 13, characterized in that the diameter (d2) of the second cylindrical body (310) is larger than the diameter (d1) of the first cylindrical body (210).

20. The stent for preventing deviation according to claim 13, characterized in that the first cylindrical body (210) has a coating portion (220) formed over its entire surface.

21. The stent for preventing deviation according to claim 13, characterized in that the first cylindrical body (210) has a coating portion (220) formed on a part of it.

22. The first cylindrical body (210) is characterized in that a number of coating portions (220) are formed at predetermined intervals along the longitudinal direction, as described in claim 13.

23. The stent for preventing deviation according to claim 20, claim 21, or claim 22, characterized in that the coating portion (220) is made of silicone or PU (polyurethane) material.

24. The first locking stent (300) is characterized in that a coating portion (340) is formed over its entire surface, as described in claim 13.

25. The stent for preventing deviation according to claim 24, characterized in that the coating portion (340) is made of silicone or PU (polyurethane) material.

26. The device includes a third cylindrical body (510) in which wires (2) made of a superelastic shape memory alloy are woven together or intersected in a mesh-like manner to form a hollow cylindrical shape, with a third space (511) formed between the wires (2), and a locking portion (520) formed on one side of the third cylindrical body (510) that widens in diameter as it moves away from the third cylindrical body (510), with an edge (521) bent inward, and a second locking stent (500) which is shorter in length than the main stent (200), On one side of the main stent (200), a second locking stent (500) is fitted in place of the first locking stent (300) on the outside, and then the first cylindrical body (210) and the third cylindrical body (510) are sewn together and connected by a connecting thread (400). When the locking portion (520) is inserted into the lumen (1) where the lesion site (1a) has occurred, it locks into the lumen (1), and when it is inserted into the lumen (1) where a through-hole (1b) has been formed, it locks around the through-hole (1b). The stent for preventing displacement according to claim 13, characterized in that when an external force is transmitted, the locking portion (520) expands while its length (L) decreases in the longitudinal direction of the first cylindrical body (210).

27. The stent for preventing deviation according to claim 26, wherein a first locking stent (300) and a second locking stent (500) are fitted to the outside of both sides of the main stent (200), and are then sewn together with a connecting thread (400), and the second locking portion (330) and the locking portion (520) face each other.

28. The stent for preventing deviation according to claim 26, characterized in that a pair of second locking stents (500) are fitted to the outside of each side of the main stent (200), and are then sewn together with connecting threads (400), and the pair of locking portions (520) face each other.

29. The stent for preventing deviation according to claim 26, characterized in that the edge (521) of the locking portion (520) is in close contact with the first cylindrical body (210).

30. The stent for preventing deviation according to claim 26, characterized in that a gap (d) is formed between the first cylindrical body (210) and one end of an adjacent edge (521).

31. The stent for preventing deviation according to claim 26, characterized in that the diameter (d3) of the third cylindrical body (510) is similar to the diameter (d1) of the first cylindrical body (210).

32. The stent for preventing deviation according to claim 26, characterized in that the diameter (d3) of the third cylindrical body (510) is larger than the diameter (d1) of the first cylindrical body (210).

33. The stent for preventing displacement according to claim 26, characterized in that the second locking stent (500) has a coating portion (530) formed over its entire surface.

34. The stent for preventing deviation according to claim 33, characterized in that the coating portion (530) is made of silicone or PU (polyurethane) material.

35. The stent for preventing deviation according to claim 26, characterized in that a curved surface (522) is formed on the outer surface of a portion of the locking portion (520) located far from the first cylindrical body (210).

36. The stent for preventing deviation according to claim 26, characterized in that the angle (θ) between the first cylindrical body (210) and the edge (521) of the locking portion (520) is 20 to 40°.

37. The stent for preventing deviation according to claim 26, characterized in that the length (L) of the locking portion (520) is formed to be even longer.

38. A stent for preventing displacement that expands a narrowed or obstructed lesion site (1a) in a lumen (1) inside the body, or connects through-holes (1b) formed in two adjacent lumen (1) inside the body, A main stent (600) includes a first cylindrical body (610) in which wires (2) made of a superelastic shape memory alloy are woven together or intersected to form a hollow cylindrical shape, and a number of first spaces (611) are formed between the wires (2); and a locking portion (620) formed by a part of the first cylindrical body (610) protruding outward in a ring shape from one side of the first cylindrical body (610) and tilted toward the opposite side of the first cylindrical body (610); and The device comprises a first locking stent (700) which is shorter in length than the main stent (600), and includes a second cylindrical body (710) in which wires (2) made of a superelastic shape memory alloy are woven together or intersected to form a hollow cylindrical shape, and a second space (711) is formed between the wires (2); a first locking portion (720) formed on one side of the second cylindrical body (710) which widens in diameter as it moves away from the second cylindrical body (710); and a second locking portion (730) formed on one side of the first locking portion (720) which narrows in diameter as it moves away from the second cylindrical body (710); On one side opposite the main stent (600), a first locking stent (700) is fitted to the outside, and then the first cylindrical body (610) and the second cylindrical body (710) are sewn together with a connecting thread (400), and the locking portion (620) and the second locking portion (730) face each other. The locking portion (620) is either locked into the lumen (1) where the lesion site (1a) has occurred, or inserted into the lumen (1) where the through-hole (1b) has been formed and locked around the through-hole (1b). The first locking portion (720) and the second locking portion (730) are either locked into the lumen (1) where the lesion site (1a) has occurred, or inserted into the lumen (1) where the through-hole (1b) has been formed, with the second locking portion (730) being locked around the through-hole (1b). When an external force is transmitted, the locking portion (620) expands while its length (L) decreases in the longitudinal direction of the first cylindrical body (610). A stent for preventing displacement, characterized in that when the first locking portion (720) and the second locking portion (730) receive an external force, the first locking portion (720) expands while its length (L1) decreases in the longitudinal direction of the first cylindrical body (610), and the second locking portion (730) expands while its length (L2) decreases in the longitudinal direction of the first cylindrical body (610).

39. The stent for preventing displacement according to claim 38, characterized in that the angle (θ) between the first cylindrical body (610) and the locking portion (620) is 20 to 40°.

40. The stent for preventing deviation according to claim 38, characterized in that a projection (630) is provided at one end of the first cylindrical body (610).

41. The first cylindrical body (610) is characterized in that a coating portion (640) is formed over its entire surface, as described in claim 38.

42. The stent for preventing deviation according to claim 38, characterized in that the first cylindrical body (610) has a coating portion (640) formed on a part of it.

43. The first cylindrical body (610) is characterized in that a large number of coating portions (640) are formed at predetermined intervals along the longitudinal direction, as described in claim 38 for preventing deviation.

44. The stent for preventing deviation according to claim 41, claim 42, or claim 43, characterized in that the coating portion (640) is made of silicone or PU (polyurethane) material.

45. A stent for preventing deviation according to claim 41, claim 42, or claim 43, characterized in that a blocking portion (641) is provided protruding from the coating portion (640) on the inner surface of the first cylindrical body (610).

46. The stent for preventing deviation according to claim 38, characterized in that a curved surface (621) is formed on the outer surface of a portion of the locking portion (620) located far from the first cylindrical body (610).

47. The stent for preventing deviation according to claim 38, characterized in that the length (L) of the locking portion (620) is formed to be even longer.

48. The stent for preventing deviation according to claim 38, characterized in that the length (L1) of the first locking portion (720) is formed to be even longer than the length (L2) of the second locking portion (730).

49. The stent for preventing deviation according to claim 38, characterized in that the second locking portion (730) is in close contact with the first cylindrical body (610).

50. The stent for preventing deviation according to claim 38, characterized in that a gap (d) is formed between the first cylindrical body (610) and one end of the adjacent second locking portion (730).

51. The stent for preventing deviation according to claim 38, characterized in that the diameter (d2) of the second cylindrical body (710) is similar to the diameter (d1) of the first cylindrical body (610).

52. The stent for preventing displacement according to claim 38, characterized in that the diameter (d2) of the second cylindrical body (710) is greater than the diameter (d1) of the first cylindrical body (610).

53. The first locking stent (700) is characterized in that a coating portion (740) is formed over its entire surface, as described in claim 38.

54. The stent for preventing deviation according to claim 53, characterized in that the coating portion (740) is made of silicone or PU (polyurethane) material.

55. The device includes a third cylindrical body (810) in which wires (2) made of a superelastic shape memory alloy are woven together or intersected in a mesh-like manner to form a hollow cylindrical shape, and a third space (811) is formed between the wires (2), and a locking portion (820) formed on one side of the third cylindrical body (810) that widens in diameter as it moves away from the third cylindrical body (810), with an edge (821) bent inward, and a second locking stent (800) which is shorter in length than the main stent (600), On one side opposite the main stent (600), a second locking stent (800) is fitted to the outside in place of the first locking stent (700), and then the first cylindrical body (610) and the third cylindrical body (810) are sewn together with a connecting thread (400), and the locking parts (620, 820) face each other. The locking portion (820) is either locked into the lumen (1) where the lesion site (1a) has occurred, or inserted into the lumen (1) where the through-hole (1b) has been formed and locked around the through-hole (1b). The stent for preventing displacement according to claim 38, characterized in that when an external force is transmitted, the locking portion (820) expands while its length (L) decreases in the longitudinal direction of the first cylindrical body (610).

56. The stent for preventing deviation according to claim 55, characterized in that the edge (821) of the locking portion (820) is in close contact with the first cylindrical body (610).

57. The stent for preventing deviation according to claim 55, characterized in that a gap (d) is formed between the first cylindrical body (610) and one end of an adjacent edge portion (821).

58. The stent for preventing deviation according to claim 55, characterized in that the diameter (d3) of the third cylindrical body (810) is similar to the diameter (d1) of the first cylindrical body (610).

59. The stent for preventing deviation according to claim 55, characterized in that the diameter (d3) of the third cylindrical body (810) is greater than the diameter (d1) of the first cylindrical body (610).

60. The stent for preventing displacement according to claim 55, characterized in that the second locking stent (800) has a coating portion (830) formed over its entire surface.

61. The stent for preventing deviation according to claim 60, characterized in that the coating portion (830) is made of silicone or PU (polyurethane) material.

62. The stent for preventing deviation according to claim 55, characterized in that a curved surface (822) is formed on the outer surface of a portion of the locking portion (820) located far from the first cylindrical body (610).

63. The stent for preventing deviation according to claim 55, characterized in that the angle (θ) between the first cylindrical body (610) and the edge (821) of the locking portion (820) is 20 to 40°.

64. The stent for preventing deviation according to claim 55, characterized in that the length (L) of the locking portion (820) is formed to be even longer.

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