Stent delivery system for placing stents in adjacent tissue layers.

Abstract

The present invention provides an easy-to-operate stent delivery system that allows for easy movement or fixation of the electrocautery tip in adjacent tissue layers, i.e., two adjacent lumens within the body, and allows for easy deployment of the stent to connect the holes in the two adjacent lumens formed by the electrocautery tip. [Solution] The stent delivery system according to the present invention is characterized in that a first handle for moving the electrocautery tip is moved or fixed in a fixed tube by a first locking member that operates semi-automatically, and a second handle for moving the outer tube for stent deployment is moved or fixed in a guide rod of the first handle by a second locking member that is actuated by a pulling external force.

Description

Technical Field

[0001] The present invention relates to a stent delivery system for implanting a stent in adjacent tissue layers, and particularly to a stent delivery system for placing a stent for securing a passage for endoscopic or shunt surgery, abscess drainage, etc. in two adjacent lumens in the body.

Background Art

[0002] When performing angioplasty with a stent loaded in a conventional stent delivery system, there was a high probability of leakage of food and digestive juices due to repeated replacement of the instrument, and complications caused thereby.

[0003] Therefore, in order to enable one-step surgery without replacing the instrument, a stent delivery system capable of performing electrocautery has been used, and Patent Document 1 also provided a device similar to the stent delivery system.

[0004] As shown in FIG. 1, Patent Document 1 achieved simplification of the surgery by realizing electrocautery performance through the tip 32, but there was a problem that it was difficult to operate for placing the stent in adjacent tissue layers.

[0005] More specifically, in order to move the tip 32 in the adjacent tissue layer, the locking device 20 had to be locked or unlocked, and in order to deploy the stent in the adjacent tissue layer, the locking device 22 had to be locked or unlocked.

[0006] That is, in the case of Patent Document 1, there was a problem that the locking device 20 and the locking device 22 had to be locked or unlocked respectively.

[0007] As a result, the difficulty in manipulating the adjacent tissue layers meant that there was a risk of errors in electrocautery via the tip 32 or errors in stent deployment, i.e., medical accidents.

[0008] Currently, there is a need for a stent delivery system that addresses the aforementioned problems. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] U.S. Patent No. 11766264 [Overview of the project] [Problems that the invention aims to solve]

[0010] Therefore, the present invention aims to provide an easy-to-operate stent delivery system that allows for easy movement or fixation of an electrocautery tip in adjacent tissue layers, i.e., two adjacent lumens within the body, and allows for easy deployment of a stent to connect the holes in the two adjacent lumens formed by the electrocautery tip. [Means for solving the problem]

[0011] To achieve the above objective, the present invention provides a fixed tube having a first passage formed inside and numerous first locking grooves formed along its longitudinal direction on its outer surface, a second passage formed inside the fixed tube so as to be movable back and forth on its outer surface into which a part of the fixed tube is inserted, a buttonhole formed on its outer surface connected to the second passage, a guide rod protruding from the outer surface on the opposite side of the fixed tube, a third passage formed inside the guide rod connected to the second passage, and first and second guide holes formed longitudinally on both sides of the outer surface of the guide rod, each connected to the third passage. A fixing portion is formed at the rear end of the third passage, a plug is attached to the guide rod around the fixing portion, and first and second locking projections are formed at both ends of the second guide hole adjacent to the second passage and the fixing portion, respectively, a first handle, a third locking projection and a pressing portion are formed on both sides, a hinge portion is formed in the middle and a seesaw member is rotatably attached to the second passage, a spring presses the third locking projection to lock it into the first locking groove, and a mechanism is mounted in the buttonhole so as to be able to move up and down, and when the pressing portion is pressed, the third locking A second locking member includes a first locking member that includes a button for releasing a projection from a first locking groove, a second handle mounted on the outer surface of the guide rod so as to be movable back and forth, and a movable member that is inserted into a third passage and has first and second guide portions formed on its outer surface which pass through the first and second guide holes respectively and are fixed to the second handle, and has second and third locking grooves formed on the outer surface of the second guide portion which engage the first and second locking projections respectively when the second handle moves forward or backward, and one end of the movable member is fixed to the other end on the opposite side. The present invention provides a stent delivery system comprising an outer tube protruding from a tube, an inner tube member inserted into the outer tube, one end of which is fixed to a fixing part, the other end of which is attached to the outer tube so as to catch on an electrocautery tip that cauterizes two adjacent lumens in the body to form holes, and the other end of which is attached to the outer tube so as to catch on an electrocautery tip, and an attachment space formed adjacent to the electrocautery tip for attaching a stent that connects a pair of holes by being crimped onto the outer tube, and a conductor connected to a plug inserted inside and connected to the electrocautery tip. [Effects of the Invention]

[0012] In this invention, pressing the button causes the third locking projection to disengage from the first locking groove, thereby releasing the lock of the first locking member.

[0013] In other words, this has the effect of allowing the first handle that moves the electrocautery tip to move along the fixed tube.

[0014] Furthermore, when the pressure on the button is released, the spring engages the third locking projection with the first locking groove, thus locking the first locking member.

[0015] In other words, the first handle used to move the electrocautery tip becomes immobile due to the fixed tube.

[0016] In other words, the first handle that moves the electrocautery tip is moved or fixed in the fixed tube by a first locking member that operates semi-automatically.

[0017] As a result, the present invention has the effect of being easy to operate, allowing for the easy movement or fixation of the electrocautery tip in adjacent tissue layers, i.e., two adjacent lumens within the body.

[0018] Furthermore, the difficulty of operation helps prevent errors in electrocautery via the electrocautery tip, i.e., medical accidents.

[0019] In this invention, when the second handle is pulled, the second locking groove disengages from the first locking projection, thus releasing the lock on the second locking member.

[0020] In other words, the second handle, which moves the outer tube for stent deployment, can be moved using the guide rod of the first handle.

[0021] Furthermore, by continuously pulling the second handle backward, the third locking groove engages with the second locking projection, thereby effectively locking the second locking member.

[0022] That is, after the stent deployment is completed, the second handle for moving the outer tube is unable to move with the guide rod of the first handle.

[0023] That is, the second handle for moving the outer tube for stent deployment is configured to be moved or fixed with the guide rod of the first handle by a second locking member that is actuated by an external pulling force.

[0024] Thereby, the present invention is easy to operate, and has the effect of easily performing stent deployment so as to connect the holes of two adjacent inner cavities formed by an electrocautery chip.

[0025] Furthermore, it has the effect of preventing mistakes in stent deployment, i.e., medical accidents, due to the difficulty of operation.

[0026] In the present invention, the second and third locking grooves are guided by the round guide surfaces of the first and second locking protrusions, and the second handle is easily unlocked or fixed with the guide rod of the first handle for easy locking or detachment from the first and second locking protrusions.

[0027] Thereby, the present invention has the effect of easily unlocking or locking the second locking member.

[0028] In the present invention, when the button is pressed or released, the seesaw member is stably rotationally guided by the holder.

[0029] That is, due to the external force for pressing the button or the elasticity of the spring for restoration, the seesaw member is prevented from swaying in the holder.

[0030] Furthermore, since the first guide protrusion of the button is guided by the first guide groove of the insertion hole, the button is prevented from swaying in the insertion hole and the button hole due to the external force for pressing the button or the elasticity of the spring for restoration.

[0031] As a result, the present invention has the effect of ensuring that the first locking member can be stably unlocked or locked.

[0032] The present invention has the effect of pressing the fixing member against the outer tube fitted into the fixing hole of the movable member while the male threaded portion is fastened to the female threaded portion.

[0033] Furthermore, the locking portion, which is expanded beyond the diameter of the outer tube, has the effect of being locked into the locking hole of the movable member.

[0034] Furthermore, the outer tube is fixed to the fixing hole of the movable member by being bonded with adhesive. In other words, the outer tube is fixed to the movable member.

[0035] As a result, the present invention has the effect of preventing the outer tube from detaching from the moving member while allowing the outer tube to move smoothly by the second handle.

[0036] This invention has the effect of deploying only a portion of the stent, namely one flange portion, while it catches on the locking pin when the second handle is retracted.

[0037] This invention has the effect of holding the second handle with a locking pin so that it does not retract along the guide rod until the stent is moved and one flange portion catches near one hole, and also prevents the stent from deploying in a location other than the surgical site.

[0038] The present invention has the effect of the second guide projection of the first handle being guided and moving in the second guide groove of the fixed pipe.

[0039] In other words, when the first handle is moved, the first handle that moves the electrocautery tip does not shake due to the fixed tube.

[0040] This invention prevents the electrocautery tip from shaking, thus preventing areas that should not be cauterized from being cauterized and preventing the formation of holes. [Brief explanation of the drawing]

[0041] [Figure 1] This is a perspective view showing a conventional stent delivery system. [Figure 2] This is a perspective view of a stent delivery system according to an embodiment of the present invention. [Figure 3] Figure 2 is a plan view. [Figure 4] This is a side view of Figure 2. [Figure 5] This is a bottom view of Figure 2. [Figure 6] Figure 2 shows a perspective view with parts of the first and second handles removed. [Figure 7] This is an exploded perspective view of a stent delivery system according to an embodiment of the present invention. [Figure 8] This is a cross-sectional view of Figure 2. [Figure 9] This is a magnified view of a portion of Figure 8. [Figure 10] This is a magnified view of a portion of Figure 8. [Figure 11] This is a magnified view of a portion of Figure 8. [Figure 12] This is a magnified view of a portion of Figure 8. [Figure 13] This is a magnified view of a portion of Figure 8. [Figure 14] This is a detailed diagram of the configuration of a stent delivery system according to an embodiment of the present invention. [Figure 15] This is a detailed diagram of the configuration of a stent delivery system according to an embodiment of the present invention. [Figure 16] This is a detailed diagram of the configuration of a stent delivery system according to an embodiment of the present invention. [Figure 17] This is a detailed diagram of the configuration of a stent delivery system according to an embodiment of the present invention. [Figure 18] This is a detailed diagram of the configuration of a stent delivery system according to an embodiment of the present invention. [Figure 19] This is a detailed diagram of the configuration of a stent delivery system according to an embodiment of the present invention. [Figure 20]This is a detailed diagram of the configuration of a stent delivery system according to an embodiment of the present invention. [Figure 21] This is a detailed diagram of the configuration of a stent delivery system according to an embodiment of the present invention. [Figure 22] This is a detailed diagram of the configuration of a stent delivery system according to an embodiment of the present invention. [Figure 23] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 24] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 25] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 26] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 27] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 28] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 29] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 30] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 31] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 32] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 33] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 34] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 35] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 36] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 37] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 38] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 39] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 40] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Figure 41] This is a diagram showing the usage state of a stent delivery system according to an embodiment of the present invention. [Modes for carrying out the invention]

[0042] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0043] As shown in Figures 2 to 41, the stent delivery system 1000 according to an embodiment of the present invention is mainly used when a stent 620 is placed so that adjacent tissue layers, such as the bile duct and the stomach, are connected, i.e., two adjacent lumens 1 within the body, in order to allow digestive enzymes from the liver and pancreas or an abscess generated by the lesion to move to the stomach when a narrowed or obstructed lesion occurs in the bile duct.

[0044] The stent delivery system 1000 includes a fixed tube 100, a first handle 200, a first locking member 300, a second locking member 400, an outer tube 500, an inner tube member 600, and a locking pin 700.

[0045] The fixed pipe 100 has a first passage 110 formed inside and numerous first locking grooves 120 formed on its outer surface along its longitudinal direction.

[0046] Here, a second guide groove 130 is formed on the outer surface of the fixed pipe 100, extending longitudinally on the opposite side of the first locking groove 120.

[0047] The front of the fixed pipe 100 is connected to the connecting portion 3a of the endoscope 3 via the connecting member 2.

[0048] The first handle 200 has a second passage 210 formed inside into which a part of the fixed pipe 100 is inserted, so as to be movable back and forth on the outer surface of the fixed pipe 100, and a buttonhole 220 formed on the outer surface that connects to the second passage 210, and a guide rod 230 formed to protrude from the outer surface on the opposite side of the fixed pipe 100.

[0049] Here, the second passage 210 has a second guide projection 240 that is guided by a second guide groove 130, which protrudes from the front end of the second passage 210, and the guide rod 230 protrudes from the rear of the first handle 200, and the first handle 200 is composed of upper and lower bodies that are connected to each other.

[0050] A third passage 231 connected to a second passage 210 is formed inside the guide rod 230, and first and second guide holes 232 and 233, which are connected to the third passage 231, are formed longitudinally on both sides of the outer surface of the guide rod 230, respectively, and a fixing portion 234 is formed at the rear end of the third passage 231, and a plug 235 is attached to the guide rod 230 around the fixing portion 234, and first and second locking protrusions 233a and 233b are formed protruding from both ends of the second guide hole 233 adjacent to the second passage 210 and the fixing portion 234, respectively.

[0051] Here, a cover portion 236 is formed protruding from the outer surface of the guide rod 230 so as to cover the plug 235, and the plug 235 is connected to the connector 4b of the cable 4a and connected to the high-frequency generator 4.

[0052] Furthermore, a round guide surface 233a' is formed on the outer surface of the first locking projection 233a, and a round guide surface 233b' is formed on the outer surface of the second locking projection 233b.

[0053] Furthermore, a fitting groove 232a is formed in the middle portion of the first guide hole 232, and a fixing hole 234a is formed in the fixing portion 234.

[0054] The first locking member 300 includes a seesaw member 310 that is rotatably mounted in the second passage 210 and has a third locking projection 311 and a pressing portion 312 protruding from both sides, and a hinge portion 313 protruding from the middle; a spring 320 that presses the third locking projection 311 to lock it into the first locking groove 120; and a button 330 that is vertically movable in the buttonhole 220 and releases the third locking projection 311 from the first locking groove 120 when the pressing portion 312 is pressed.

[0055] The first locking member 300 is attached to the second passage 210 and further includes a holder 340 in which a rotating groove 341 is formed in the middle portion into which a hinge portion 313 is fitted so as to rotate, a first through hole 342 is formed on one side which penetrates a third locking projection 311 that is pressed by a spring 320, and a protruding portion 343 is formed on the other side which has an insertion hole 343a into which a button 330 that presses the pressing portion 312 is inserted.

[0056] Here, the seesaw member 310 is rotatably attached to the second passage 210 by the holder 340, and the seesaw member 310 and the holder 340 are located above the fixed pipe 100.

[0057] Furthermore, first guide grooves 343b are formed on both sides of the insertion hole 343a, and first guide protrusions 331 are formed on both sides of the outer surface of the button 330, which are guided by the first guide grooves 343b.

[0058] The second locking member 400 includes a second handle 410 mounted on the outer surface of the guide rod 230 so as to be movable back and forth, and a movable member 420 inserted into the third passage 231, with first and second guide portions 421 and 422 formed on its outer surface which pass through the first and second guide holes 232 and 233, respectively and are fixed to the second handle 410, and second and third locking grooves 422a and 422b formed on the outer surface of the second guide portion 422 which engage first and second locking projections 233a and 233b, respectively when the second handle 410 moves forward or backward.

[0059] Here, the second and third locking grooves 422a and 422b are formed on one side of the second guide portion 422 and are rounded to correspond to the rounded guide surfaces 233a' and 233b' of the first and second locking protrusions 233a and 233b, respectively.

[0060] The second handle 410 is composed of upper and lower bodies that are connected to each other, and fitting grooves 411 are formed on the inner upper and lower parts, respectively. The first and second guide parts 421 and 422 are formed to protrude from the outer surface of the movable member 420 so as to be guided by the first and second guide holes 232 and 233, respectively. On the faces of the first and second guide parts 421 and 422, which face each other, fitting projections 421a and 422c are formed to be fitted into the pair of fitting grooves 411, respectively.

[0061] One end of the outer tube 500 is fixed to the movable member 420, and the other end protrudes from the fixed tube 100.

[0062] Here, the external tube 500 is inserted into the inside of the connecting portion 3a of the endoscope 3 and into the inside of the tube 3b of the endoscope 3 which is connected to the connecting portion 3a.

[0063] The internal tube member 600 is inserted into the external tube 500, with one end fixed to the fixing part 234. An electrocautery tip 610 is attached to the other end so as to catch on the entrance of the external tube 500, and a mounting space 630 is formed behind the electrocautery tip 610, adjacent to the electrocautery tip 610, where a stent 620 connecting the pair of holes 1a is crimped and attached to the external tube 500. A conductor 235a connected to the plug 235 is inserted inside and connected to the electrocautery tip 610.

[0064] Here, the internal tube member 600 is fitted into and fixed in the fixing hole 234a of the fixing part 234, with a part of the plug 235 inserted inside, and is made of an insulating material.

[0065] Furthermore, the electrocautery tip 610 is equipped with an insulating member, and a pair of flange portions 621 are formed on both sides of the stent 620, respectively, which hook around the pair of holes 1a.

[0066] Furthermore, a guide wire may be inserted inside the internal tube member 600 to guide the patient to two adjacent lumens 1 within the body.

[0067] A fixing hole 423 is formed through the inner surface of the movable member 420, into which the outer tube 500 is fitted.

[0068] Here, the outer tube 500 is bonded to the fixing hole 423 with an adhesive 520 such as a bond.

[0069] A female threaded portion 423a is formed at the rear end of the fixing hole 423, and the second locking member 400 has a male threaded portion 431 formed on its outer surface that fastens to the female threaded portion 423a, and a second through hole 432 formed in the center that penetrates the internal tube member 600, and further includes a fixing member 430 that presses the outer tube 500 when fastening the male threaded portion 431 to the female threaded portion 423a.

[0070] Here, the internal tube member 600 includes a fixed tube 600a, one end of which is fixed to the fixing part 234, and the other end of which is inserted into the outside tube 500 by passing through the second through hole 432 of the fixing member 430 and the fixing hole 423 of the movable member 420; and an internal tube 600b, one end of which is connected to the front of the fixed tube 600a, with an electrocautery tip 610 attached to the other end of which, and a mounting space 630 formed behind the electrocautery tip 610 and adjacent to the electrocautery tip 610, on the other end of which is inserted into the outside tube 500, where a stent 620 is crimped and attached to the outside tube 500.

[0071] A portion of the fixing hole 423 adjacent to the female thread portion 423a is formed such that its diameter becomes larger than that of the fixing hole 423 as it approaches the fixing member 430, thereby forming a locking hole 423b.

[0072] A portion of the outer tube 500 adjacent to the female thread portion 423a is formed such that its diameter increases as it approaches the fixing member 430, and a locking portion 510 is formed which is locked into the locking hole 423b.

[0073] The stent delivery system 1000 further includes a locking pin 700 that is fitted into the fitting groove 232a and which the second handle 410 catches on when the second handle 410 is retracted.

[0074] Next, as shown in Figures 2 to 41, the operation and effects of the stent delivery system 1000 according to the embodiment of the present invention configured as described above will be explained.

[0075] With the tube 3b of the endoscope 3 inserted so as to be positioned in the two adjacent lumens 1 within the body, the stent delivery system 1000 is positioned around the endoscope 3. As shown in Figures 23 and 24, after attaching the connecting member 2 to the front of the fixed tube 100, the fixed tube 100 is connected to the connecting part 3a of the endoscope 3 via the connecting member 2 while inserting the outer tube 500 into the connecting part 3a and tube 3b of the endoscope 3.

[0076] As a result, the stent delivery system 1000 is connected to the endoscope 3.

[0077] As shown in Figure 25, the plug 235 is connected to the connector 4b of the cable 4a and to the high-frequency generator 4, and the electrocautery chip 610 generates high-frequency heat while receiving current from the high-frequency generator 4 via the conductor 235a.

[0078] As shown in Figures 26 and 27, the lock on the first locking member 300 is released so that the first handle 200 can move on the outer surface of the fixed pipe 100.

[0079] More specifically, with the user holding the first handle 200 in their hand, the user presses the button 330 with their finger, thereby pressing the pressing part 312 with the button 330.

[0080] As a result, the seesaw member 310 rotates around the hinge portion 313, and the third locking projection 311 disengages from the first locking groove 120.

[0081] Here, the button 330 is inserted into the insertion hole 343a of the protruding portion 343 while the first guide projection 331 is guided by the first guide groove 343b, and the spring 320 is compressed at one end of the seesaw member 310 on which the third locking projection 311 is formed.

[0082] As a result, the first handle 200 becomes free in the fixed pipe 100 when the first locking member 300 is released.

[0083] As shown in Figure 28, the first handle 200 is advanced along the outer surface of the fixed pipe 100.

[0084] Here, the second guide projection 240 of the first handle 200 is guided into the second guide groove 130 of the fixed pipe 100.

[0085] As a result, the second handle 410 moves forward together with the first handle 200 because the first locking projection 233a of the second locking groove 422a of the movable member 420 is locked into it and fixed to the guide rod 230 of the first handle 200.

[0086] The outer tube 500 is also bonded and fixed to the fixing hole 423 by adhesive 520, and the locking portion 510 is pressed against the fixing member 430 while being locked in the locking hole 423b, thereby fixing it to the moving member 420, and thus moves forward together with the second handle 410.

[0087] Furthermore, since the internal tube member 600 is also fixed to the fixing portion 234 of the guide rod 230, it moves forward together with the first handle 200.

[0088] As shown in Figure 29, the electrocautery tip 610 moves forward together with the first handle 200, cauterizing and cutting two adjacent lumens 1 inside the body to form a hole 1a.

[0089] In other words, the two adjacent lumens 1 are permeated while being cauterized by the high-frequency heat generated from the electrocautery tip 610, and holes 1a are formed in each of them.

[0090] As shown in Figures 30 and 31, after the hole 1a is formed, the first locking member 300 is locked on the outer surface of the fixing pipe 100 so that the first handle 200 cannot move.

[0091] More specifically, the pressure on the button 330 against the pressing portion 312 is released.

[0092] As a result, the spring 320 returns from its compressed state to its original state, causing the seesaw member 310 to rotate around the hinge portion 313, and the third locking projection 311 is pressed by the spring 320 and locked into the first locking groove 120.

[0093] Here, the button 330 protrudes from the insertion hole 343a and the buttonhole 220 of the protruding portion 343, with the first guide projection 331 being guided by the first guide groove 343b.

[0094] As a result, the first handle 200 is fixed to the fixed pipe 100 by the locking of the first locking member 300.

[0095] Alternatively, the connection between the plug 235 and the connector 4b of the cable 4a may be disconnected, or the operation of the high-frequency generator 4 may be interrupted.

[0096] As a result, high-frequency heat is no longer generated in the electrocautery tip 610.

[0097] As shown in Figures 32 and 33, the lock on the second locking member 400 is released so that the second handle 410 can move on the outer surface of the guide rod 230.

[0098] More specifically, the user pulls the second handle 410 with their hand to retract it along the outer surface of the guide rod 230, thereby disengaging the second locking groove 422a of the movable member 420 from the first locking projection 233a.

[0099] Here, the second locking groove 422a of the movable member 420 is guided by the round guide surface 233a' of the first locking projection 233a and easily disengages.

[0100] As a result, the second locking member 400 is released by the external force pulling the second handle 410, and the second handle 410 becomes free on the guide rod 230 due to the release of the second locking member 400.

[0101] As shown in Figures 34 and 35, the movable member 420 retracts together with the second handle 410, with the first and second guide portions 421 and 422 being guided by the first and second guide holes 232 and 233 of the guide rod 230, respectively.

[0102] As a result, the external tube 500 fixed to the movable member 420 retracts together with the second handle 410, and the stent 620, which was pressed against the mounting space 630 of the internal tube member 600 by the external tube 500, partially unfolds (expands) to return to its original state as the external tube 500 retracts.

[0103] At this time, the second handle 410 is interrupted from retracting while being locked by the locking pin 700, and the stent 620 expands (deploys) by releasing only one of the pair of flange portions 621 from the mounting space 630.

[0104] As shown in Figures 36 and 37, after the user presses the button 330 to release the lock on the first locking member 300 in the same manner as described above, the user takes the second handle 410 with one hand and fixes it to the guide rod 230, while pulling the first handle 200 with the other hand to retract it along the outer surface of the fixing pipe 100.

[0105] As a result, the internal tube member 600 and the external tube 500, which are fixed to the first and second handles 200 and 410 respectively, retract along the pair of holes 1a, and the stent 620, which was partially pressed against the mounting space 630 of the internal tube member 600 by the external tube 500, also retracts.

[0106] At this point, the flange portion 621 of the stent 620, which has detached from the mounting space 630, moves toward the hole 1a.

[0107] Subsequently, when the flange portion 621 catches around the hole 1a, the user releases the pressure on the button 330 and locks the first locking member 300 in the same manner as described above, while releasing their hand from the second handle 410.

[0108] As shown in Figures 38 and 39, after the locking pin 700 is disengaged from the fitting groove 232a, the second handle 410 is pulled by the user's hand to retract the second handle 410 along the outer surface of the guide rod 230.

[0109] As a result, the third locking groove 422b of the movable member 420 is locked to the second locking projection 233b, and the second handle 410 can no longer move on the outer surface of the guide rod 230.

[0110] Here, the third locking groove 422b of the movable member 420 is guided by the round guide surface 233b' of the second locking projection 233b and is easily locked to the second locking projection 233b.

[0111] As a result, the second locking member 400 is locked by the external force pulling the second handle 410, while the second handle 410 is fixed to the guide rod 230.

[0112] As shown in Figures 40 and 41, the stent 600 is fully unfolded (expanded) to its original state and completely detached from the mounting space 630 of the internal tube member 600, and the pair of flange portions 621 each catch around the pair of holes 1a.

[0113] As a result, the stent 600 connects the holes 1a of two adjacent lumens 1 within the body.

[0114] Once the stent 600 has been placed, the stent delivery system 1000 of the present invention is separated from the endoscope 3, and the outer tube 500 and the inner tube member 600 are removed from the body.

[0115] Although the present invention has been illustrated and described above with reference to specific preferred embodiments, the present invention is not limited to the above embodiments, and various modifications and alterations are possible by persons with ordinary skill in the art to which the invention pertains, without departing from the spirit of the invention. [Explanation of symbols]

[0116] 100 fixed tube 110 1st aisle 120 First locking groove 130 Second guide groove 200 First Handle 210 2nd aisle 220 buttonholes 230 Guide Rod 231 3rd aisle 232 First guide hole 232a Fitting groove 233 Second guide hole 233a 1st locking protrusion 233a' Guide surface 233b 2nd locking protrusion 233b' Guide surface 234 Fixed part 235 plug 235a conductor 240 Second guide projection 300 First locking member 310 Seesaw component 311 Third locking protrusion 312 Pressing part 313 Hinge section 320 springs 330 buttons 331 First guide projection 340 holder 341 Rotary groove 342 First through hole 343 Protrusion 343a Insertion hole 343b First guide groove 400 Second locking member 410 Second handle 420 Moving Member 421 First Guide Section 422 Second Guide Section 422a Second locking groove 422b 3rd locking groove 423 Fixed hole 423a Female thread section 423b Locking hole 430 Fixing member 431 Male threaded section 432 Second through hole 500 External Tube 510 Locking part 520 Adhesive 600 Internal tubing member 610 Electrocautery Tip 620 stent 630 mounting space 700 Locking pins 1000 Stent Delivery System

Claims

1. A fixed pipe (100) having a first passage (110) formed inside and numerous first locking grooves (120) formed along its longitudinal direction on its outer surface, A second passage (210) into which a part of the fixing tube (100) is inserted is formed inside the fixing tube (100) so as to be movable back and forth on the outer surface of the fixing tube (100), a buttonhole (220) is formed on the outer surface connected to the second passage (210), a guide rod (230) protrudes from the outer surface on the opposite side of the fixing tube (100), a third passage (231) is formed inside the guide rod (230) connected to the second passage (210), and the third passage (2 31) The first handle (200) has first and second guide holes (232, 233) which are formed to be long in the longitudinal direction, a fixing portion (234) is formed at the rear end of the third passage (231), a plug (235) is attached to the guide rod (230) around the fixing portion (234), and first and second locking projections (233a, 233b) are formed at both ends of the second guide hole (233) which is adjacent to the second passage (210) and the fixing portion (234), respectively, A first locking member (300) includes a seesaw member (310) which has a third locking projection (311) and a pressing portion (312) formed on both sides and a hinge portion (313) formed in the middle and is rotatably attached to the second passage (210), a spring (320) which presses the third locking projection (311) to lock it into the first locking groove (120), and a button (330) which is mounted in the buttonhole (220) so as to be able to move up and down and which, when the pressing portion (312) is pressed, releases the third locking projection (311) from the first locking groove (120), The second locking member (400) includes a second handle (410) mounted on the outer surface of the guide rod (230) so as to be movable back and forth, and a movable member (420) which is inserted into the third passage (231) and fixed to the second handle (410) by passing through the first and second guide holes (232, 233), respectively, and has first and second guide portions (421, 422) formed on its outer surface, and second and third locking grooves (422a, 422b) formed on the outer surface of the second guide portion (422) which engage the first and second locking projections (233a, 233b) respectively when the second handle (410) moves forward or backward, An external tube (500) is fixed to the movable member (420) at one end, and the other end protrudes from the fixed pipe (100). An internal tube member (600) is inserted into the external tube (500), with one end fixed to the fixing part (234), and the other end is attached to the external tube (500) so as to catch on the external tube (500) and to which an electrocautery tip (610) is attached to the external tube (500) so as to catch on the external tube (500) and to which a stent (620) connecting a pair of holes (1a) is attached by being crimped to the external tube (500), and an internal tube member (600) is inserted into which a conductor (235a) connected to the plug (235) is inserted and connected to the electrocautery tip (610), A stent delivery system including [a specific component].

2. A rounded guide surface (233a') is formed on the outer surface of the first locking projection (233a). The stent delivery system according to claim 1, characterized in that a rounded guide surface (233b') is formed on the outer surface of the second locking projection (233b).

3. The stent delivery system according to claim 1, further comprising a holder (340) attached to a second passage (210), having a rotating groove (341) formed in the middle portion into which a hinge portion (313) is rotatably fitted, a first through hole (342) formed on one side through which a third locking projection (311) pressed by a spring (320) passes, and a projection (343) formed on the other side having an insertion hole (343a) into which a button (330) that presses the pressing portion (312) is inserted.

4. A first guide groove (343b) is formed in the insertion hole (343a). The stent delivery system according to claim 3, characterized in that a first guide projection (331) is formed on the outer surface of the button (330) which is guided into a first guide groove (343b).

5. A fixing hole (423) is formed through the outer surface of the movable member (420) into which the outer tube (500) is fitted. A female threaded portion (423a) is formed at the rear end of the fixing hole (423). The stent delivery system according to claim 1, characterized in that the second locking member (400) has a male threaded portion (431) formed on its outer surface which is fastened to the female threaded portion (423a), a second through-hole (432) formed in the center which penetrates to the internal tube member (600), and further includes a fixing member (430) which presses against the external tube (500) when fastening the male threaded portion (431) to the female threaded portion (423a).

6. A portion of the fixing hole (423) adjacent to the female thread portion (423a) is formed such that its diameter increases as it approaches the fixing member (430), and a locking hole (423b) is formed therein. The stent delivery system according to claim 5, characterized in that a portion of the outer tube (500) adjacent to the female thread portion (423a) is formed such that its diameter increases as it approaches the fixing member (430), and a locking portion (510) that locks into the locking hole (423b) is formed therein.

7. The stent delivery system according to claim 5, characterized in that the outer tube (500) is bonded to the fixing hole (423) by an adhesive (520).

8. A fitting groove (232a) is formed in the first guide hole (232). The stent delivery system according to claim 1, further comprising a locking pin (700) which is fitted into the fitting groove (232a) and which catches the second handle (410) when the second handle (410) is retracted.

9. On the outer surface of the aforementioned fixed pipe (100), a second guide groove (130) is formed, extending longitudinally on the opposite side of the first locking groove (120). The stent delivery system according to claim 1, characterized in that a second guide projection (240) is formed in the second passage (210) which is guided by a second guide groove (130).

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