JP5813230B2 - Stent - Google Patents

Description

  The present invention relates to a stent for preventing stenosis or occlusion of a tubular organ, rupture of an aneurysm, etc. by being placed in a tubular organ such as a bile duct, ureter, trachea, blood vessel, etc., and particularly suitable for a digestive system covered stent. Related stents.

  In recent years, stents have been placed in stenosis or occlusions in tubular organs such as bile ducts, ureters, trachea, blood vessels, etc., and expanded, or stents have been placed where aneurysms have occurred to prevent aneurysm rupture. A treatment method using a stent such as or is performed.

  This type of stent is, for example, attached to a sheath or catheter, etc. with the stent contracted in diameter, transported to a target position in a body tissue such as a bile duct, and then pushed out from the sheath or catheter to self-expand the stent. Alternatively, the balloon placed inside the stent is inflated to expand the diameter, thereby being placed in close contact with the inner wall of the tubular organ.

  For example, Patent Document 1 described below describes a stent formed of a plurality of wires, and between the one end and the other end of the stent is larger than the diameter of the same end and the other end. A central spherical region bulging in the outer diameter direction is provided so as to increase the diameter. Inside this central spherical region is a void. The central spherical region is in close contact with the inner wall of the blood vessel, so that the stent is positioned and placed in the cardiovascular vessel.

  By the way, when a stent is placed in a tubular organ, particularly when a stent is placed in a tubular organ of the digestive system such as a bile duct, the lumen of the stent may increase due to body fluid such as bile or cell proliferation over time. May become occluded and it may be necessary to remove the stent from the tubular organ. In this case, for example, the stent placed in the tubular organ is pulled, peeled off from the inner wall of the tubular organ, and then extracted from the tubular organ.

Special table 2011-509805 gazette

  The stent of Patent Document 1 has a shape in which the central portion swells in a spherical shape so as to match the inner peripheral shape of the blood vessel of the heart, and bites into the inner wall of the tubular organ for the purpose of anchoring effect. It does not form a protruding shape.

  In addition, it is conceivable that a part of the stent protrudes to give an anchoring effect. However, if the protruding part has a shape that pierces the inner wall of the tubular organ sharply, it becomes difficult to remove the stent when it is necessary to remove the stent. .

  On the other hand, when the protruding portion has a shape that gently swells, the bulging portion may be deformed and easily displaced.

  Accordingly, an object of the present invention is to provide a stent that can be firmly placed so as not to be displaced in a predetermined position of a tubular organ and can be easily removed when it is necessary to remove it from the body. There is.

  In order to achieve the above object, a stent of the present invention is placed in a tubular organ, has a tubular shape as a whole, and has a metal stent body having bulged portions at a plurality of locations on the outer periphery, A resin cover member covering at least the outer periphery and / or inner periphery including the bulging portion of the stent body, and a void is formed inside the bulging portion, and the inner peripheral surface is filled with resin. It is characterized by being.

  In the stent of the present invention, it is preferable that the filling rate of the resin with respect to the volume of the void in the bulging portion formed by the stent body is 10 to 60%.

  In the stent of the present invention, the cover member is formed so as to cover the outer periphery and inner periphery of the stent body, the portion covering the outer periphery is formed of silicone, and the portion covering the inner periphery is formed of polyurethane. Preferably it is.

  In the stent of the present invention, the stent body is formed by processing a metal cylinder into a mesh shape, or processing a metal plate into a mesh shape and forming it into a cylinder shape. Is preferred.

  In the stent of the present invention, it is preferable that a material for imparting contrast is mixed with the resin filled in the gap of the bulging portion.

  According to the present invention, a stent is attached to a sheath, a catheter, or the like in a reduced diameter state, and transported to a target position of a body tissue such as a bile duct, and then the stent is pushed out of the sheath, the catheter, etc., and self-expanded. By expanding the diameter of the balloon disposed on the inside by expanding the balloon, the stent can be placed at a predetermined position of the tubular organ while the bulging portion is in close contact with the inner wall of the tubular organ.

  At this time, the bulging portion reinforced with the resin is in close contact with the inner wall of the tubular organ to improve the anchoring effect, so that the movement of the stent is effectively suppressed, and the stent is fixed over a long period of time. Can be stably placed at the position.

  In addition, when it becomes necessary to remove the stent due to a blockage or the like, the stent is grasped and pulled with a medical gripper such as a snare or forceps inserted through a catheter, etc. Since the bulging portion is deformed and easily separated from the inner wall of the tubular organ, the stent can be easily removed.

1 shows an embodiment of the stent of the present invention, and is a perspective view in a state where a part thereof is broken. FIG. It is a perspective view of the stent main body which comprises the stent. The stent main body which comprises the stent is shown, (a) The development view, (b) is the development view of the stent main body in another example. (A) is a principal part top view of the stent of this invention, (b) is a principal part side view of the stent. (A) is sectional drawing in the AA arrow line of FIG. 1, (b) is sectional drawing in the BB arrow line of FIG. It is sectional drawing when the stent of this invention is fractured | ruptured along an axial direction. The other arrangement | positioning example of the bulging part is shown in the stent, (a) is sectional drawing of the state arrange | positioned facing the circumferential direction of the stent main body, (b) is equivalent to the circumferential direction of the stent main body. It is sectional drawing of the state arrange | positioned 4 by the space | interval. It is explanatory drawing at the time of indwelling the stent in a tubular organ. It is a perspective view which shows other embodiment of the stent of this invention.

  Hereinafter, an embodiment of the stent of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1, 5, and 6, the stent 10 in this embodiment includes a metal stent body 20 having bulged portions 30 at a plurality of locations on the outer periphery, and at least the bulged portion of the stent body 20. And a resin cover member 40 covering the outer periphery and / or the inner periphery including 30.

  In this embodiment, the stent body 20 is formed in a mesh shape by processing a metal cylinder by laser processing, etching, or the like. The pattern shape of the mesh is not particularly limited as long as the diameter can be reduced and expanded, but for example, the shapes shown in the developed views of FIGS. 3A and 3B are preferably employed.

  In the example of FIG. 3A, a circumferential unit 23 is formed which is bent into a waveform and extends in a zigzag shape along the circumferential direction, and both ends of the zigzag portion 21 are connected in an annular shape. And the bending part of the zigzag-shaped part 21 of each circumferential direction unit 23 is connected via the connection part 25, The some circumferential direction unit 23 is connected to the axial direction via the connection part 25. A stent body 20 having a cylindrical shape as a whole is configured.

  Further, in the example of FIG. 3B, a circumferential unit 23 in which a plurality of frame-like bodies 22 are connected in the circumferential direction is connected in the axial direction via a plurality of connecting portions 25 to form a cylindrical shape. Has been.

  In this way, a pattern having a wave shape or a frame shape is connected in the circumferential direction to form a circumferential unit, and this circumferential unit is connected in the axial direction so that a cylindrical shape as a whole is preferably employed.

  The stent body 20 of this embodiment is formed by processing a metal cylinder. For example, a plurality of circumferential units 23 each having a zigzag portion 21 and a frame body 22 are formed by processing a metal plate. Then, the metal plate may be formed to be bent into a cylindrical shape.

  The material of the stent main body 20 made of metal is not particularly limited. For example, stainless steel, Ta, Ti, Pt, Au, W, etc., Ni—Ti alloy, Co—Cr alloy, Co—Cr—Ni alloy, etc. , Cu-Zn-X (X = Al, Fe, etc.) alloys, Ni-Ti-X (X = Fe, Cu, V, Co, etc.) alloys and the like are preferable.

  Then, after the metal cylinder or metal plate is processed into a cylindrical shape as described above, it is attached to a predetermined mold and subjected to heat treatment or press molding, so that a bulging portion is formed on the outer periphery thereof as shown in FIG. By forming 30, the stent body 20 used in the present invention can be obtained. When a shape memory alloy is employed, a self-expanding stent body 20 that is always expanded in diameter can be obtained by performing a shape memory process. As shown in FIGS. 2, 5, and 6, a void 31 is formed inside the bulging portion 30 of the stent body 20.

  Although the stent body 20 of this embodiment is a self-expanding type that is normally in an expanded state, it is attached to a balloon catheter or the like and expanded by inflating a balloon disposed inside the stent. The diameter of the balloon may be increased.

  The cover member 40 is formed so as to cover at least a portion including the bulging portion of the stent body 20. In this embodiment, almost the entire stent body 20 is covered with a cover member. However, for example, at the branching portion of the tubular organ, the stent body 20 is partially formed so as not to disturb the flow of the branched tubular organ. It may have an exposed shape.

  As shown in FIGS. 1, 5 and 6, the cover member 40 in this embodiment includes an inner layer 41 covering the inner peripheral side of the stent main body 20, an outer layer 43 covering the outer peripheral side of the stent main body 20, and a bulging portion. 30 and the resin 70 filled in the inner periphery. In the following description, the bulging portion in which the bulging portion 30 of the stent body 20 is covered with the cover member 40 will also be described as the bulging portion 30.

  As shown in FIGS. 1 and 5 (a), 5 (b), the bulging portion 30 extends with a predetermined width in the circumferential direction and a predetermined length in the axial direction, and smoothly protrudes so as to gradually become lower. It is preferable to make the shape. Further, the bulging portions 30 are arranged at a plurality of locations at predetermined intervals along the circumferential direction of the stent body 20, and are arranged at a plurality of locations at predetermined intervals along the axial direction. The stent body 20 is preferably disposed at a position where it does not overlap when viewed in the axial direction from the end face of the stent body 20. In this embodiment, the bulging part 30 is arrange | positioned so that it may be equal in the circumferential direction at a location near the one end and the other end of the stent main body 20 in the circumferential direction so as not to overlap at both ends in the axial direction. .

  The arrangement shape of the bulging portion 30 is not particularly limited. For example, as shown in FIG. 7A, the bulging portion 30 is formed at two locations facing the circumferential direction of the stent body 20, and The bulging portions 30 arranged in the circumferential direction may be further provided at a plurality of locations at predetermined intervals in the axial direction and at an angle of 90 degrees from each other when viewed from the axial direction. Moreover, as shown in FIG.7 (b), while forming the bulging parts 30 in four places at equal intervals in the circumferential direction of the stent body 20, the bulging parts 30 arranged in such a circumferential direction include: Further, it may be provided at a plurality of locations at predetermined intervals in the axial direction and at an angle of 45 degrees from each other when viewed from the axial direction. As described above, when the stent body 20 is viewed from the axial end surface, the bulging portions 30 adjacent in the axial direction are preferably disposed at positions that do not overlap each other.

  In addition, as shown in FIGS. 1 and 4A, the bulging portion 30 in this embodiment has a tapered shape with a sharp tip 61 in the axial direction, and the side edges 63 and 63 are curved while drawing a curve. It is formed in a substantially water droplet shape having a diameter that gradually increases toward the direction base end side. And when arrange | positioning the stent 10 in a tubular organ, it arrange | positions so that the front-end | tip 61 side of the bulging part 30 may become an extraction direction when extracting the stent 10 (refer FIG. 8). .

  Furthermore, as shown in FIGS. 1, 4B and 6, the outer periphery of the bulging portion 30 along the axial direction of the stent body 20 gradually rises higher from the tip 61 side and rises to the top 65 (stent body). 20 which is the highest projecting portion on the outer periphery of the outer periphery 20), and gradually becomes lower from the topmost portion 65 toward the base end side.

  As shown in FIG. 1 and FIGS. 5A and 5B, the portion of the bulging portion 30 along the circumferential direction of the stent body 20 also rises gradually from one end in the circumferential direction to the topmost portion 65. Thus, the shape gradually decreases from the top 65 toward the other end in the circumferential direction. Therefore, the bulging portion 30 has a shape that smoothly bulges as a whole without a corner portion or an edge portion on its peripheral surface.

  Further, as shown in FIGS. 4B and 6, the inclination of the bulging portion 30 along the axial direction of the stent body 20 is a slope in the extraction direction of the stent 10 with respect to the topmost portion 65, that is, the axis. So that the slope of the tip-side slope 67 from the tip 61 in the direction to the top 65 is gentler than the slope on the opposite side, that is, the base slope 69 from the top 65 to the axial base. Is formed.

  Further, as shown in FIG. 4A, the length of the bulging portion 30 along the axial direction of the stent body 20 is formed larger than the width along the circumferential direction of the bulging portion 30.

  The inner layer 41, the outer layer 43 and the resin 70 constituting the cover member 40 are, for example, polyurethane, silicone, natural rubber, nylon elastomer, polyether block amide, polyethylene, polyvinyl chloride, vinyl acetate, or polytetrafluoro. Fluorine resins such as ethylene (PTFE), perfluoroalkoxy resin (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-ethylene copolymer (ETFE), polybutadiene, etc. It is preferably formed of olefin rubber, styrene elastomer or the like. In particular, it is more preferable that the inner layer 41 is made of polyurethane, the outer layer 43 is made of silicone, and the resin 70 is made of polyurethane or silicone.

  The resin 70 filled in the inner periphery of the bulging portion 30 is mixed with a material for imparting contrast, such as barium sulfate, platinum, gold, tungsten, bismuth oxide, bismuth dioxide, and tantalum. It is preferable.

  The method for forming the cover member 40 is not particularly limited. In this embodiment, the cover body 40 is formed by coating the stent body 20 with a predetermined resin material by dipping or coating.

  In order to obtain a structure in which the inner periphery of the bulging portion 30 is filled with the resin 70, for example, the bulging portion 30 of the stent body 20 is previously coated with the resin 70 and adhered to a predetermined thickness, A method of forming a resin film for forming the inner layer 41 by dipping or coating and further forming a resin film for forming the outer layer 43 by dipping or coating may be employed.

  Further, a resin film that forms the inner layer 41 is formed on the stent body 20 by dipping or coating, and further, a resin film that forms the outer layer 43 is formed by dipping or coating, and then a resin 70 is formed on the inner periphery of the bulging portion 30. May be injected and filled.

  Furthermore, the cover member 40 can also be formed by covering the stent body 20 with a resin tube. In this case, for example, after covering a plurality of resin tubes constituting the inner layer 41 and the outer layer 43, the resin 70 may be injected and adhered to the inner periphery of the bulging portion 30.

  In the case of this embodiment, as shown in FIGS. 5A, 5 </ b> B, and 6, in the portion other than the bulging portion 30, the cover member 40 is configured by an inner layer 41 and an outer layer 43. Is embedded in them. Further, in the bulging portion 30, the resin film of the inner layer 41 is formed so as to cover the inner peripheral side opening of the bulging portion 30, and the resin 70 is attached to the inner periphery of the stent body 20 relatively thickly. The outer periphery is covered with the resin film of the inner layer 41, and the entire structure is further covered with the resin film of the outer layer 43. In the bulging portion 30, a space 31 surrounded by each resin film is formed. However, there may be no resin film covering the inner peripheral side opening of the bulging portion 30, and the gap 31 may have a structure opened on the inner peripheral side.

  In the stent 10 of the present invention, as shown in FIGS. 5 and 6, a resin is used so that the cover member 40 is thickened on the inner peripheral surface of the gap 31 formed inside the bulging portion 30 of the stent body 20. 70 is formed, and the thickness T1 of the bulging portion 30 of the cover member 40 is formed to be thicker than the thickness T2 of the bulging portion 30 of the cover member 40 when the resin 70 is not filled. Has been.

  In addition, the inner volume of the bulging portion 30 of the stent body 20 in a state where the cover member 40 is not provided (the inner volume of the bulging portion only excluding the space forming the cylindrical portion of the stent body 20) is 100%. The filling ratio of the resin 70 with respect to the volume is preferably 10 to 60%, and more preferably 20 to 50%. When the filling rate is less than 10%, the anchoring performance when the stent 10 is placed in the tubular organ cannot be sufficiently improved, and when the filling rate exceeds 60%, the bulging portion The deformability of 30 is lowered, and it becomes difficult to mount the stent 10 on a sheath, a catheter or the like.

  In this embodiment, the resin 70 is thin at the tip end in the axial direction and is thick toward the base end side in the axial direction (see FIG. 6), and is thick at the center in the circumferential direction. The inner peripheral surface of the bulging portion 30 is filled so as to become thinner toward the surface (see FIG. 5).

  Next, an example of a method for using the stent 10 having the above structure will be described.

  As shown in FIG. 8, the bile duct V2 and the pancreatic duct V3 branch and extend from the duodenum V1, but in this embodiment, a case where the stent 10 is placed in the bile duct V2 will be described. The stent 10 of the present invention can be applied to various tubular organs such as the trachea, esophagus, large intestine, and blood vessels other than the bile duct V2, but is particularly suitable as a stent for a digestive system tubular organ. .

  First, the diameter of the stent 10 is reduced and accommodated in the inner periphery of the distal end portion of a medical tube (not shown) such as a sheath or catheter so that the distal end 61 side of the bulging portion 30 of the stent 10 faces the proximal end side of the medical tube. . At this time, in the stent 10 of the present invention, since the void 31 is provided in the bulging portion 30 formed in the stent main body 20, the bulging portion 30 may have some degree of deformability. It is possible to improve the mountability when the stent 10 is attached to a sheath, a catheter, or the like. Moreover, the said effect can further be heightened by making the filling rate of the resin 70 with respect to the inner volume in the state which does not provide the cover member 40 of the bulging part 30 into 10 to 60%.

  Then, an endoscope (not shown) is moved to the duodenum V1 through the oral cavity, stomach or the like by a well-known method, a guide wire (not shown) is introduced into the bile duct V2 through the lumen of the endoscope, and the distal end thereof is connected to the bile duct V2. To reach a position slightly beyond the constricted affected area.

  Thereafter, the medical tube containing the stent 10 is transported through the guide wire, and the distal end thereof reaches the affected part of the bile duct V2. In this state, a pusher or the like is inserted into the medical tube, and the stent 10 is pushed out from the distal end of the medical tube via the pusher or the like, so that the diameter of the stent 10 is expanded as shown in FIG.

  Then, the metal stent main body 20 is expanded in diameter, the plurality of bulging portions 30 are in close contact with the inner wall of the bile duct V2, and the stent 10 is placed in a state where the constricted affected part of the bile duct V2 is pushed and expanded by the expansion force. can do. In addition, it is preferable to indwell the stent 10 so that the one end part may protrude a little from the opening of the bile duct V2.

  At this time, in the stent 10, the bulging portion 30 reinforced by the resin 70 filled in the inner peripheral surface of the gap 31 of the bulging portion 30 so as to be thicker than other portions is the inner wall of the bile duct V2. The anchoring effect can be improved, the stent 10 can be firmly fixed to the bile duct V2, and the movement of the stent 10 in the bile duct V2 can be effectively suppressed, The stent 10 can be stably placed at a predetermined position over a long period of time.

  Further, in this embodiment, since the stent body 20 is formed in a mesh shape by processing a metal cylinder, the total length is hardly changed between the diameter reduction and the diameter expansion, and the shortening is less likely to occur. Can be accurately placed at a predetermined position of a tubular organ such as the bile duct V2 while suppressing displacement.

  Furthermore, in this embodiment, since the bulging part 30 is arrange | positioned in multiple places at predetermined intervals in the circumferential direction and axial direction of the outer periphery of the stent main body 20, it can provide a uniform fixing force with good balance. Further, as shown in FIGS. 1 and 5A, the bulging portion 30 is disposed at a position where it does not overlap when the stent body 20 is viewed from the axial end, so that the shaft of the stent 10 Directional movement can be prevented more effectively.

  When the lumen of the stent 10 is blocked with a bodily fluid such as bile or the treatment is completed and the stent 10 is to be removed from the tubular organ, for example, the stent 10 protrudes from the opening of the bile duct V2. A portion (see FIG. 8) or a predetermined portion of the stent 10 is grasped by a medical snare or a medical treatment clamp, and the stent 10 is pulled out from the bile duct V2 and pulled out to the duodenum V1 side. The stent 10 can be removed and the stent 10 can be removed from the body.

  At this time, in the stent 10 of the present invention, the bulging portion 30 can be relatively easily deformed and easily separated from the inner wall of the bile duct V2 by the gap 31 formed inside the bulging portion 30. The stent 10 can be easily removed.

  Further, in this embodiment, since the bulging portion 30 has a shape that protrudes smoothly so as to gradually rise and gradually lower, the stent 10 can be extracted from the bile duct V2 relatively smoothly, and Since the distal end side inclined surface 67 of the portion 30 is formed more gently than the proximal end side inclined surface 69 (see FIG. 4B), the bulging portion 30 adheres to the inner wall without being caught by the inner wall of the bile duct V2. The stent 10 can be extracted smoothly from the bile duct V2. Furthermore, since the axial length of the bulging portion 30 is formed to be larger than the width along the circumferential direction (see FIG. 4A), a large contact area with the inner wall of the tubular organ is ensured in the axial direction. The anchoring effect on the tubular organ can be enhanced, and the stent 10 can be easily extracted from the tubular organ due to the long shape in the axial direction.

  Moreover, in this embodiment, since the filling rate of the resin 70 with respect to the volume of the void 31 in the bulging portion 30 formed in the stent body 20 is 10 to 60%, in the tubular organ such as the bile duct V2 or the like. Anchoring performance when the stent 10 is indwelled and extractability when the stent 10 is taken out from the tubular organ can be obtained with a good balance.

  Moreover, in this embodiment, since the inner periphery and outer periphery of the stent main body 20 are covered with the cover member 40 and the mesh-shaped opening of the stent main body 20 is covered, a body fluid or a tumor can be obtained at the time of stent placement. Tissues and the like are prevented from entering the stent 10 and are less likely to be blocked within the stent.

  Furthermore, when the inner layer 41 that forms the inner side of the cover member 40 is formed of polyurethane and the outer layer 43 that forms the outer side of the cover member 40 is formed of silicone, the inner layer 41 formed of polyurethane allows body fluids such as bile to flow. The outer layer 43 formed of silicone that is not hydrolyzed protects the inner layer 41 made of polyurethane that is easily hydrolyzed, and prevents the cover member 40 from being blocked. Durability can be increased.

  Further, in this embodiment, the stent body 20 is formed in a mesh shape by processing a metal cylinder, but by filling the space 70 inside the bulging portion 30 with the resin 70, the following The effect is brought about. That is, for example, when the stent 10 having the above structure is placed at a bent portion of the tubular organ, the corners and ends of the mesh pattern tend to protrude outward particularly in the bulging portion 30. However, since the inner peripheral surface of the bulging portion 30 is filled with the resin 70 so as to make the cover member 40 thicker, the thicker cover member 40 causes the corners and ends of the mesh pattern to be outward. Can be suppressed, and the pullability when the stent 10 is taken out from the body can be maintained well.

  Furthermore, in this embodiment, since the resin 70 filled in the gap 31 of the bulging portion 30 is mixed with a material for imparting contrast, the contrast is imparted to the bulging portion 30 of the stent 10. In addition, the hardness of the resin 70 at that portion can be increased, and the anchoring effect of the stent 10 on the inner wall of the tubular organ by the bulging portion 30 can be further improved.

  FIG. 9 illustrates another embodiment of the stent of the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The stent 10a of this embodiment is different from the above-described embodiment in that the bulging portion 30a has a shape that smoothly bulges so as to be substantially elliptical as a whole. As in the above-described embodiment, the bulging portion 30a is provided at a location facing the circumferential direction of the stent body 20, or four bulging portions 30a are provided at equal intervals in the circumferential direction of the stent body 20. Also good.

10, 10a Stent 20 Stent body 30, 30a Swelling portion 31 Gap 40 Cover member 70 Resin

Claims (5)

A stent placed in a tubular organ,
A metal stent body having a tubular shape as a whole and having bulging portions at a plurality of locations on the outer periphery,
A resin cover member covering the outer periphery and the inner periphery including at least the bulging portion of the stent body,
The bulging portion is open on the inner peripheral side, the inner peripheral opening is covered with the cover member, and a void surrounded by the cover member is formed inside the bulging portion. A stent having a surface filled with a resin different from the cover member. A stent placed in a tubular organ,
A metal stent body having a tubular shape as a whole and having bulging portions at a plurality of locations on the outer periphery,
A resin cover member covering at least the outer periphery and / or inner periphery including the bulging portion of the stent body;
A void is formed inside the bulging portion, and the inner peripheral surface is filled with resin,
The said cover member is formed so that the outer periphery and inner periphery of the said stent main body may be covered, the part which covers an outer periphery is formed with silicone, and the part which covers an inner periphery is formed with the polyurethane characterized by the above-mentioned. . A stent placed in a tubular organ,
A metal stent body having a tubular shape as a whole and having bulging portions at a plurality of locations on the outer periphery,
A resin cover member covering at least the outer periphery and / or inner periphery including the bulging portion of the stent body;
A void is formed inside the bulging portion, and the inner peripheral surface is filled with resin,
The stent is characterized in that a material for imparting contrast is mixed in the resin filled in the voids of the bulging portion.   The stent according to any one of claims 1 to 3, wherein a filling rate of the resin with respect to a volume of a void in a bulging portion formed by the stent body is 10 to 60%.   The said stent main body consists of what processed the metal cylinder and formed it in the shape of a mesh, or processed and formed the metal plate in the shape of a mesh, and shape | molded in the shape of a cylinder. The stent according to any one of the above.

Images