Stent and stent assembly

Abstract

This stent comprises: a main body part including a drainage passage and an installation passage; and a removal string inserted into and fastened to the installation passage. The installation passage extends inside the main body part in the front-rear direction and passes through the main body part, and the removal string is inserted into the installation passage so as to extend frontward from the front end of the installation passage and extend rearward from the rear end of the installation passage. A protrusion part is further included, which protrudes toward the drainage passage from an inner surface of the main body part that forms the drainage passage and extends along the inner surface in the front-rear direction, wherein the installation passage is formed to span the main body part and the protrusion part.

Description

Stents and stent assemblies

[0001] The present invention relates to a stent and a stent assembly.

[0002] Typically, lesions in various non-vascular organs, such as the biliary tract, esophagus, gastrointestinal tract, trachea, and ureters, can cause narrowing of the organ's ducts. Furthermore, wounds resulting from endoscopic procedures to treat lesions can temporarily cause inflammation, narrowing the organ's ducts. For organs experiencing such narrowing, various types of stents are used to widen the ducts.

[0003] When a lesion in the bile duct narrows the duct, a stent can be inserted into the duct to widen the duct. Conventionally, stents were inserted so that a portion of the stent was positioned within the duodenum to facilitate its removal. This approach, however, presented a problem: food passing through the duodenum could block the stent.

[0004] Therefore, even if the entire stent is inserted inside the bile duct to prevent the stent from being blocked by food passing through the duodenum, there is a need to develop a stent that can be easily removed from the bile duct when removal of the stent is necessary.

[0005] Embodiments of the present invention have been invented against the background described above, and are intended to provide a stent and stent assembly that are fully inserted into the bile duct to prevent the drainage tube from being blocked by food passing through the duodenum, and can be easily removed from the bile duct by a removal line.

[0006] A stent according to one embodiment of the present invention comprises: a main body including a drainage passage and an installation passage; and a removal string inserted into and tied to the installation passage, wherein the installation passage extends forward and backward within the main body and penetrates the main body, and the removal string is inserted into the installation passage so as to extend forward from a front end of the installation passage and backward from a rear end of the installation passage.

[0007] In addition, the apparatus further includes a protrusion that protrudes from the inner surface of the main body portion forming the drainage passage toward the drainage passage and extends in the front-back direction along the inner surface of the main body portion, and the installation passage may be formed across the main body portion and the protrusion. In addition, the apparatus further includes a protrusion that protrudes outward from the outer surface of the main body portion and extends in the front-back direction along the outer surface of the main body portion, and the installation passage may be formed across the main body portion and the protrusion.

[0008] In addition, it includes a first fastening member arranged at one end of the removal line to restrict the one end of the removal line from being introduced into the interior of the installation passage; and a second fastening member arranged on the removal line so as to be spaced apart from the one end of the removal line, and a distance between the first fastening member and the second fastening member may be greater than the length of the installation passage in the front-rear direction.

[0009] In addition, the drainage passage may be arranged at the center of the radial direction of the main body, and the installation passage may be arranged on the outside in the radial direction relative to the drainage passage.

[0010] In addition, the installation passages are provided in multiple numbers, and the multiple installation passages can be arranged to be spaced apart from each other in the circumferential direction of the main body.

[0011] In addition, the plurality of installation passages include a first installation passage and a second installation passage, and the removal line is provided in a ring shape and inserted into the first installation passage and the second installation passage, and one side of the removal line can be brought into contact with the main body at the front outside of the first installation passage and the second installation passage.

[0012] In addition, the diameter of the front end of the main body may decrease as it goes forward. A stent assembly according to another embodiment of the present invention includes the above-described stent; and a pusher connected to the rear side of the stent and configured to bind the removal string.

[0013] In addition, the pusher includes an outer member in which a transport passage and an insertion hole into which the removal string is inserted are formed; and an inner member that is slidably inserted into the transport passage, wherein the removal string is inserted into the insertion hole and positioned inside the transport passage, and when the inner member is inserted into the transport passage, the removal string can be caught and tied between the inner surface of the outer member forming the transport passage and the outer surface of the inner member.

[0014] In addition, when the pusher is connected to the rear side of the stent, the transport passage communicates with the drainage passage, and the inner member can be inserted into the drainage passage through the transport passage.

[0015] According to embodiments of the present invention, by ensuring that the entire stent is inserted into the inside of the bile duct, the stent's drainage tube is prevented from being blocked by food passing through the duodenum, and by extending the removal line connected to the stent to the outside of the bile duct, the stent can be easily removed from the bile duct.

[0016] FIG. 1 is a perspective view showing a stent according to a first embodiment of the present invention.

[0017] Figure 2 is a cross-sectional view taken in the front-back direction of Figure 1.

[0018] Figure 3 is a cross-sectional view taken in the left and right directions of Figure 1, with the protrusion protruding into the interior of the main body.

[0019] Figure 4 is a cross-sectional view taken in the left and right directions of Figure 1, with the protrusion protruding outward from the main body.

[0020] Figure 5 is a perspective view showing a stent according to a second embodiment of the present invention.

[0021] Figure 6 is a cross-sectional view taken in the front-back direction of Figure 5.

[0022] Figure 7 is a cross-sectional view taken in the left and right directions of Figure 5, with the protrusion protruding into the interior of the main body.

[0023] Figure 8 is a cross-sectional view taken in the left and right directions of Figure 5, with the installation passages arranged on the left and right sides of the main body.

[0024] Figure 9 is a cross-sectional view of a stent cut in the left and right directions according to the third embodiment of the present invention.

[0025] Figure 10 is a cross-sectional view of a stent assembly according to one embodiment of the present invention.

[0026] Figure 11 is a cross-sectional view showing a state in which the inner member in Figure 10 has been moved to the outside of the outer member.

[0027] Figure 12 is a cross-sectional view showing the state in which the stent and the outer member are separated in Figure 11.

[0028] Hereinafter, specific embodiments for implementing the technical idea of ​​the present invention will be described in detail with reference to the drawings.

[0029] In addition, when explaining the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0030] Additionally, when it is said that a component is 'connected' or 'in contact with' another component, it should be understood that it may be directly connected or in contact with that other component, but there may also be other components in between.

[0031] The terminology used herein is intended solely to describe specific embodiments and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

[0032] Additionally, please note that the terms "upper side," "lower side," and "side" in this specification are based on the illustrations in the drawings and may be expressed differently if the orientation of the subject changes. For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted, and the sizes of each component do not fully reflect the actual size.

[0033] Additionally, terms that include ordinal numbers, such as "first," "second," etc., may be used to describe various components, but these components are not limited by such terms. These terms are used solely to distinguish one component from another.

[0034] The term "comprising" as used in the specification means specifying a particular characteristic, region, integer, step, operation, element and / or component, but does not exclude the presence or addition of other particular characteristics, regions, integers, steps, operations, elements, components and / or groups.

[0035] Hereinafter, the specific configuration of a stent (100) according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

[0036] Referring to FIGS. 1 and 2, a stent (100) can be inserted into a human biliary tract to expand a narrowed biliary tract. The stent (100) may include a main body (110), a protrusion (120), a removal string (130), a first fastening member (140), and a second fastening member (150).

[0037] The main body (110) can be inserted into the biliary tract of the human body. The main body (110) can be formed in a cylindrical shape extending in the front-back direction. A drainage passage (111) can be formed in the inner center of the main body (110). The drainage passage (111) formed in the main body (110) can provide a passage for bile flowing through the biliary tract to flow. The drainage passage (111) can be formed to extend in the front-back direction from the center of the main body (110) so as to open the front and rear of the main body (110). In other words, the drainage passage (111) can be formed to penetrate the center of the main body (110) in the front-back direction. In addition, an installation passage (112) for installing a removal string (130) can be formed in the main body (110). The installation passage (112) may be formed to extend in the front-rear direction of the main body (110) so as to be positioned on the outside of the main body (110) relative to the drainage passage (111). In other words, the installation passage (112) may be formed to extend in the front-rear direction of the main body (110) between the inner surface of the main body (110) forming the drainage passage (111) and the outer surface of the main body (110) so as to open the front and rear of the main body (110). This installation passage (112) may be formed across the main body (110) and the protrusion (120). In addition, the diameter of the front end of the main body (110) may be formed to be smaller than the diameters of other parts of the main body (110). In other words, the front side of the main body (110) may be formed so that the cross-sectional area gradually decreases as it goes forward. In this way, since the front side of the main body (110) is formed pointedly, the main body (110) can more easily enter the biliary tract. The front side of the installation passage (112) can be formed on the front side slope of the main body (110).

[0038] Referring to FIG. 3, the protrusion (120) may be formed to protrude from the inner surface of the main body (110) toward the center of the drainage passage (111) and extend in the front-back direction along the inner surface of the main body (110). This protrusion (120) may thicken the thickness between the inner surface of the main body (110) forming the drainage passage (111) and the outer surface of the main body (110). If the thickness between the inner surface of the main body (110) and the outer surface of the main body (110) is thin, the thickness for forming the installation passage (112) may not be secured. Therefore, the thickness for forming the installation passage (112) may be secured by forming the protrusion (120) at the point where the installation passage (112) is formed.

[0039] Referring to FIG. 4, the protrusion (120) may be formed to protrude outward from the outer surface of the main body (110) and extend in the front-back direction along the outer surface of the main body (110). This protrusion (120) may thicken the thickness between the inner surface of the main body (110) forming the drainage passage (111) and the outer surface of the main body (110). If the thickness between the inner surface of the main body (110) and the outer surface of the main body (110) is thin, the thickness for forming the installation passage (112) may not be secured. Therefore, the thickness for forming the installation passage (112) may be secured by forming the protrusion (120) at the point where the installation passage (112) is formed.

[0040] The removal string (130) can be inserted into the installation passage (112) and tied to the main body (110). The removal string (130) can be inserted into the installation passage (112) so that one side extends forward of the installation passage (112) and the other side extends backward of the installation passage (112). In other words, the removal string (130) can be formed to have a length longer than the length in the anteroposterior direction of the installation passage (112), and when inserted into the installation passage (112), it can be arranged so that one side and the other side extend forward and backward of the installation passage (112). The other side of the removal string (130) can be extended long backward of the installation passage (112) so that when the stent (100) is inserted into the biliary tract of a human body, it can be placed in the duodenum, which is outside the biliary tract. In this way, since the removal string (130) is installed across the front-back direction of the main body (110), when the operator pulls the removal string (130) to remove the stent (100), the force exerted by the operator can be applied to the entire front-back direction of the main body (110). Accordingly, when removing the stent (100), problems such as the main body (110) being bent or the removal string (130) being detached from the main body (110) do not occur, making it easier to remove the stent (100) from the bile duct.

[0041] The first binding member (140) may be arranged at one end of the removal line (130) to prevent one end of the removal line (130) from entering the interior of the installation passage (112). The first binding member (140) may be a knot in which a portion of the removal line (130) is wound multiple times. In addition, the first binding member (140) may be provided as a ball tip. The first binding member (140) may be formed to be larger than the diameter of the installation passage (112) to prevent one end of the removal line (130) from entering the interior of the installation passage (112).

[0042] The second fastening member (150) may be arranged on the removal rope (130), but may be arranged so as to be spaced apart from one end of the removal rope (130) in the other direction. The second fastening member (150) may be a knot in which a portion of the removal rope (130) is wound multiple times. In addition, the second fastening member (150) may be a pipe-shaped fixing member into which the removal rope (130) may be inserted. The second fastening member (150) may be formed to be larger than the diameter of the installation passage (112), thereby preventing the removal rope (130) located behind the point where the second fastening member (150) is arranged from entering the interior of the installation passage (112). The distance between the second fastening member (150) and the first fastening member (140) may be larger than the length of the installation passage (112) in the front-rear direction. In this way, the removal line (130) is fixed to the installation passage (112) by the first fastening member (140) and the second fastening member (150) installed on the removal line (130), so that the removal line (130) can be fastened to the main body (110).

[0043] Meanwhile, in addition to these configurations, a stent (100) according to a second embodiment of the present invention may be provided. The second embodiment of the present invention will be described with reference to FIGS. 5 to 8. In describing the second embodiment, when compared with the above-described embodiment, the same description refers to the above-described embodiment.

[0044] Hereinafter, the specific configuration of the stent (100) according to the second embodiment of the present invention will be described.

[0045] Referring to FIGS. 5 and 6, a stent (100) can be inserted into a human biliary tract to expand a narrowed biliary tract. This stent (100) can include a main body (110), a protrusion (120), a removal string (130), and a second binding member (150).

[0046] The main body (110) can be inserted into the biliary tract of the human body. The main body (110) can be formed in a cylindrical shape extending in the front-back direction. A drainage passage (111) can be formed in the inner center of the main body (110). The drainage passage (111) formed in the main body (110) can provide a passage for bile flowing through the biliary tract to flow. The drainage passage (111) can be formed to extend in the front-back direction from the center of the main body (110) so as to open the front and rear of the main body (110). In other words, the drainage passage (111) can be formed to penetrate the main body (110) in the front-back direction. In addition, an installation passage (112) for installing a removal string (130) can be formed in the main body (110). A plurality of such installation passages (112) can be provided. The plurality of installation passages (112) may include a first installation passage and a second installation passage. The first installation passage and the second installation passage may be formed to be disposed radially outer than the drainage passage (111) of the main body (110) and extend in the front-back direction of the main body (110). In other words, the first installation passage and the second installation passage may be formed to extend in the front-back direction of the main body (110) between the inner surface of the main body (110) forming the drainage passage (111) and the outer surface of the main body (110) so as to open the front and rear of the main body (110). The first installation passage and the second installation passage may be formed across the main body (110) and the protrusion (120). The first installation passage and the second installation passage may be disposed to be spaced apart from each other in the circumferential direction of the drainage passage (111). Additionally, the diameter of the front end of the main body (110) may be formed to be smaller than the diameters of other parts of the main body (110). In other words, the front end of the main body (110) may be formed to have a cross-sectional area that gradually decreases as it moves forward. In this way, since the front end of the main body (110) is formed to be pointed, the main body (110) can more easily enter the bile duct.The front side of the first installation passage and the second installation passage can be formed on the front side inclined surface of the main body (110).

[0047] Referring to Fig. 7, a plurality of installation passages (112) may be provided, and for example, the installation passages (112) may include a first installation passage and a second installation passage. The first installation passage and the second installation passage may be arranged to be spaced apart from each other in the circumferential direction of the main body (110). The protrusion (120) may be formed to protrude from the inner surface of the main body (110) toward the center of the drainage passage (111) and extend in the front-back direction along the inner surface of the main body (110). This protrusion (120) may thicken the thickness between the inner surface of the main body (110) forming the drainage passage (111) and the outer surface of the main body (110). If the thickness between the inner surface of the main body (110) and the outer surface of the main body (110) is thin, the thickness for forming the installation passage (112) may not be secured. Accordingly, a protrusion (120) can be formed at the point where the installation passage (112) is formed to secure a thickness for forming the installation passage (112).

[0048] In addition, although not shown in the drawing, the protrusion (120) may be formed to protrude outward from the outer surface of the main body (110) and extend in the front-back direction along the outer surface of the main body (110). This protrusion (120) may thicken the thickness between the inner surface of the main body (110) forming the drainage passage (111) and the outer surface of the main body (110). If the thickness between the inner surface of the main body (110) and the outer surface of the main body (110) is thin, the thickness for forming the installation passage (112) may not be secured. Therefore, the thickness for forming the installation passage (112) may be secured by forming the protrusion (120) at the point where the installation passage (112) is formed.

[0049] Referring to Fig. 8, a first installation passage and a second installation passage can be formed in the main body (110) without a protrusion (120). The first installation passage and the second installation passage can be formed between the inner surface of the main body (110) and the outer surface of the main body (110), and can be spaced apart from each other at a separation angle of 180° based on the center of the drainage passage (111).

[0050] The removal string (130) can be inserted into the installation passage (112) and tied to the main body (110). The removal string (130) is provided in a ring shape and can be inserted into the first installation passage and the second installation passage. One side of the removal string (130) contacts the main body (110) at the front outside of the first installation passage and the second installation passage, and the other side of the removal string (130) can extend to the rear of the first installation passage and the second installation passage. In other words, the removal string (130) can be formed to have a length longer than the lengths in the front-back direction of the first installation passage and the second installation passage, and can be arranged so that when inserted into the installation passage (112), the other side extends to the rear of the first installation passage and the second installation passage. The other side of the removal line (130) is extended long toward the rear of the installation passage (112) so that when the stent (100) is inserted into the human biliary tract, it can be placed in the duodenum, which is outside the biliary tract. In this way, since the removal line (130) is installed across the front-back direction of the main body (110), when the operator pulls the removal line (130) to remove the stent (100), the force of the operator's pulling can be applied to the entire front-back direction of the main body (110). Accordingly, when removing the stent (100), problems such as the main body (110) being bent or the removal line (130) being detached from the main body (110) do not occur, making it easier to remove the stent (100) from the biliary tract.

[0051] The second fastening member (150) may be arranged on the removal line (130), but may be arranged so as to be spaced apart from one end of the removal line (130) in the other direction. The second fastening member (150) may be a knot in which a portion of the removal line (130) is wound multiple times. In addition, the second fastening member (150) may be a pipe-shaped fixing member into which the removal line (130) may be inserted. The second fastening member (150) may be formed to have a diameter larger than that of the first installation passage and the second installation passage, thereby preventing the removal line (130) behind the point where the second fastening member (150) is arranged from entering the interior of the first installation passage and the second installation passage. The distance between the second fastening member (150) and one side of the removal string (130) may be greater than the length in the forward and backward directions of the first installation passage and the second installation passage. In this way, the removal string (130) may be fixed to the first installation passage and the second installation passage by the second fastening member (150) installed on the removal string (130), thereby allowing the removal string (130) to be fastened to the main body (110).

[0052] Meanwhile, in addition to these configurations, a stent (100) according to a third embodiment of the present invention may be provided. Referring to FIG. 9, the third embodiment of the present invention will be described. In describing the third embodiment, there are differences in the number and positions of installation passages (112) compared to the above-described embodiment. Therefore, the description will focus on these differences, and the same description will refer to the above-described embodiment.

[0053] Referring to Fig. 9, a plurality of installation passages (112) may be provided. These installation passages (112) may include a first installation passage, a second installation passage, a third installation passage, and a fourth installation passage.

[0054] The first installation passage, the second installation passage, the third installation passage, and the fourth installation passage may be formed to extend in the front-rear direction of the main body (110) so as to be arranged on the outside of the main body (110) relative to the drainage passage (111). In other words, the first installation passage, the second installation passage, the third installation passage, and the fourth installation passage may be formed to extend in the front-rear direction of the main body (110) between the inner surface of the main body (110) forming the drainage passage (111) and the outer surface of the main body (110), thereby opening the front and rear of the main body (110). The first installation passage, the second installation passage, the third installation passage, and the fourth installation passage may be arranged to be spaced apart from each other in the circumferential direction of the drainage passage (111). In this embodiment, since the installation passage (112) includes a first installation passage, a second installation passage, a third installation passage, and a fourth installation passage, two ring-shaped removal lines (130) may be provided. The first removal line may be installed to be inserted into the first and second installation passages, and the second removal line may be installed to be inserted into the third and fourth installation passages. In addition, four removal lines (130) may be provided and installed to be inserted into each installation passage (112).

[0055] Hereinafter, a specific configuration of a stent assembly (10) according to one embodiment of the present invention will be described with reference to FIGS. 10 to 12.

[0056] Referring to FIG. 10, the stent assembly (10) of the present invention may include a stent (100) and a pusher (200).

[0057] Since the stent (100) has been specifically described in the above-described embodiment, a detailed description thereof will be omitted.

[0058] The pusher (200) can move the stent (100) into the biliary tract of the human body. The pusher (200) is connected to the rear side of the stent (100) and can bind the rear side of the removal line (130). The pusher (200) can include an outer member (210) and an inner member (220).

[0059] The outer member (210) may be formed in a cylindrical shape extending in the front-back direction. This outer member (210) may be arranged to be connected to the rear side of the stent (100). A transport passage (211) may be formed in the inner center of the outer member (210). The transport passage (211) may provide a passage for the inner member (220) to slide. The transport passage (211) may be formed to extend in the front-back direction from the center of the outer member (210) so as to open the front and rear of the outer member (210). In other words, the transport passage (211) may be formed to penetrate the center of the outer member (210) in the front-back direction. This transport passage (211) may be formed to communicate with the drainage passage (111) when the outer member (210) is connected to the rear side of the stent (100). In addition, an insertion hole (212) may be formed in the outer member (210) for inserting the rear side of the removal string (130). The insertion hole (212) may be formed to penetrate the outer member (210) from the radially outer side of the outer member (210) to communicate the outside of the outer member (210) with the transport passage (211). The rear side of the removal string (130) may be inserted into this insertion hole (212). The rear side of the removal string (130) inserted into the insertion hole (212) may be located inside the transport passage (211).

[0060] The inner member (220) can be slidably inserted into the transport passage (211) of the outer member (210). The inner member (220) can be formed with a diameter corresponding to the transport passage (211). The inner member (220) can be inserted into the drainage passage (111) of the stent (100) through the transport passage (211). When the inner member (220) is inserted into the transport passage (2110), a portion of the rear side of the removal string (130) can be inserted between the inner surface of the outer member (210) forming the transport passage (211) and the outer surface of the inner member (220). In this way, the stent (100) and the pusher (200) can be coupled and connected by the portion of the rear side of the removal string (130) being inserted and connected between the outer member (210) and the inner member (220). By moving the pusher (200) into the biliary tract of the human body while the stent (100) and the pusher (200) are coupled and connected, the stent (100) can be introduced into the biliary tract.

[0061] Referring to Fig. 11, after the stent (100) is positioned inside the bile duct, the inner member (220) can be moved to the rear of the outer member (210) to separate the stent (100) and the outer member (210) from the inner member (220). In this way, when the inner member (220) is separated from the outer member (210), the binding on the rear side of the removal string (130) can be released. When the binding on the rear side of the removal string (130) is released, the connection between the stent (100) and the outer member (210) can be released.

[0062] Referring to Fig. 12, after the rear side of the removal line (130) is released from its binding, the outer member (210) can be moved rearward to release the connection between the stent (100) and the outer member (210). In this way, by moving the outer member (210) and the inner member (220) whose connection with the stent (100) has been released to the outside of the human body, only the stent (100) can be inserted into the human bile duct.

[0063] Hereinafter, the operation and effect of a stent (100) and a stent assembly (10) according to one embodiment of the present invention will be described.

[0064] The stent (100) and stent assembly (10) according to one embodiment of the present invention have the effect of preventing the drainage tube of the stent (100) from being blocked by food passing through the duodenum by allowing the entire stent (100) to be inserted into the inside of the bile duct, and of allowing the stent (100) to be easily removed from the bile duct by extending the removal string (130) connected to the stent (100) to the outside of the bile duct.

[0065] In addition, the stent (100) and stent assembly (10) according to one embodiment of the present invention have a removal string (130) installed across the front-back direction of the main body (110) of the stent (100), so that when the operator pulls the removal string (130) to remove the stent (100), the force of the operator's pulling is applied to the entire front-back direction of the main body (110), thereby preventing the main body (110) from being bent or the removal string (130) from being detached from the main body (110) during the process of removing the stent (100).

[0066] Although the embodiments of the present invention have been described as specific embodiments, these are merely examples, and the present invention is not limited thereto, but should be construed to have the broadest scope in accordance with the technical concepts disclosed in this specification. Those skilled in the art may combine / substitute the disclosed embodiments to implement patterns of shapes not specified, but this also does not depart from the scope of the present invention. In addition, those skilled in the art may easily modify or alter the disclosed embodiments based on this specification, and it is clear that such modifications or alterations also fall within the scope of the present invention.

Claims

1. A main body including a drainage passage and an installation passage; and Including a removal line that is inserted into and tied to the above installation passage, The above installation passage extends forward and backward inside the main body and penetrates the main body, The above removal line is inserted into the installation passage so as to extend forward from the front end of the installation passage and backward from the rear end of the installation passage. Stent.

2. In paragraph 1, Further comprising a protrusion that protrudes from the inner surface of the main body part forming the drainage passage toward the drainage passage and extends in the front-back direction along the inner surface of the main body part, The above installation passage is formed across the main body and the protrusion. Stent.

3. In paragraph 1, It further includes a protrusion that protrudes outward from the outer surface of the main body and extends in the front-back direction along the outer surface of the main body, The above installation passage is formed across the main body and the protrusion. Stent.

4. In paragraph 1, A first fastening member arranged at one end of the removal line to restrict the one end of the removal line from being introduced into the interior of the installation passage; and A second fastening member is disposed on the removal line so as to be spaced apart from the one end of the removal line, The distance between the first fastening member and the second fastening member is greater than the length of the installation passage in the front-rear direction. Stent.

5. In paragraph 1, The above drainage passage is arranged at the center of the radial direction of the main body, The above installation passage is arranged on the outside in the radial direction compared to the above drainage passage. Stent.

6. In paragraph 5, The above installation passages are provided in multiple pieces, The above plurality of installation passages are arranged to be spaced apart from each other in the circumferential direction of the main body. Stent.

7. In paragraph 6, The above plurality of installation passages include a first installation passage and a second installation passage, The above removal line is provided in a ring shape and is inserted into the first installation passage and the second installation passage, One side of the above removal line is in contact with the main body from the front outside of the first installation passage and the second installation passage. Stent.

8. In paragraph 1, The diameter of the front end of the above main body portion decreases as it goes forward. Stent.

9. A stent according to any one of claims 1 to 8; and A pusher connected to the rear side of the stent and configured to bind the removal line, Stent assembly.

10. In paragraph 9, The above pusher, An outer member in which a transfer passage and an insertion hole into which the removal line is inserted are formed; and It includes an inner member that is inserted into the above-mentioned transport passage so as to be able to slide, The above removal line is inserted into the insertion hole and positioned inside the transport passage, When the inner member is inserted into the transport passage, the removal line is caught and tied between the inner surface of the outer member forming the transport passage and the outer surface of the inner member. Stent assembly.

11. In paragraph 10, When the pusher is connected to the rear side of the stent, the transport passage communicates with the drainage passage, and the inner member is inserted into the drainage passage through the transport passage. Stent assembly.

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