A plastic pancreatic duct stent

Abstract

The present application discloses a plastic pancreatic duct stent, which relates to the technical field of medical devices. The stent comprises a support tube having a drainage hole formed therein, a guide portion provided at one end of the support tube, and a receiving groove formed on the outer wall of the support tube; a plurality of liquid inlet holes evenly spaced apart on the support tube wall, the liquid inlet holes being adjacent to the guide portion; a support membrane; an inflation tube, the inflation tube having multiple and evenly spaced inflation tubes disposed between a first opening and a second opening, the inflation tube having a diameter decreasing from the first opening toward the second opening; a connecting tube provided within the support membrane, an air storage bag provided within the support tube, and a transmission tube provided within the support membrane; an extrusion assembly, which extrudes the air storage bag, thereby expanding the support membrane to the outside of the receiving groove; and a control assembly provided on the support tube, which controls the extrusion assembly to enter an extrusion state when the guidewire slips out of the drainage hole. The present application can reduce the possibility of the pancreatic duct stent slipping.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a plastic pancreatic duct stent. Background Art

[0002] A pancreatic duct stent is a long, thin tube that is inserted through the pancreatic duct under endoscopic guidance and placed inside the duct. By unblocking the blocked or narrowed pancreatic duct, a pancreatic duct stent can restore normal pancreatic function and alleviate the symptoms and discomfort associated with pancreatic disease.

[0003] Currently, before introducing a pancreatic duct stent, a pusher is first connected to the tail of the pancreatic duct stent, then a guide wire is passed through the pusher and the pancreatic duct stent, and then the guide wire is guided into the pancreatic duct until it reaches the installation position of the pancreatic duct stent; the pancreatic duct stent is then pushed by the pusher, and the pancreatic duct stent moves along the guide wire to the required installation position in the pancreatic duct, and finally the guide wire is retracted until it is detached from the pancreatic duct stent, and then the pusher is controlled to separate from the pancreatic duct stent.

[0004] However, during the use of the pancreatic duct stent, due to the uneven inner diameter of the pancreatic duct wall, the pancreatic duct stent is not firm enough in the pancreatic duct and is prone to slipping, which affects the use effect of the pancreatic duct stent. Summary of the Invention

[0005] In order to reduce the possibility of pancreatic duct stent slippage, the present application provides a plastic pancreatic duct stent.

[0006] The present application provides a plastic pancreatic duct stent, which adopts the following technical solution:

[0007] A plastic pancreatic duct stent comprises a support tube, wherein a drainage hole extending in an axial direction is provided in the support tube, a guide portion is provided at one end of the support tube, and an accommodating groove extending in a circumferential direction is provided on an outer wall of the support tube;

[0008] The support tube wall is evenly spaced and provided with a plurality of liquid inlet holes;

[0009] a support membrane connected end to end and arranged around the support tube, with two ends of the support membrane respectively having a first opening and a second opening, the first opening having a larger diameter than the second opening, and the second opening having one side of the support tube and being located in the receiving groove;

[0010] an inflation tube disposed circumferentially within the support membrane, wherein a plurality of the inflation tubes are evenly spaced between the first opening and the second opening, and wherein the diameter of the inflation tube decreases from the first opening toward the second opening;

[0011] A connecting tube connected to the inflation tube is provided in the supporting membrane, an air storage bag is provided in the supporting tube, and a transmission tube connected to the air storage bag and the connecting tube is provided in the supporting tube;

[0012] An extrusion assembly is provided on the support tube, and the extrusion assembly squeezes the air storage bag, and at this time the support membrane is expanded to the outside of the accommodating groove;

[0013] The support tube is provided with a control component, and when the wire slides out of the drainage hole, the control component controls the extrusion component to enter an extrusion state.

[0014] By employing this technical solution, the placement of the inlet near the guide portion establishes a pancreatic drainage channel during the initial stent implantation phase, preventing the increase in pancreatic duct pressure caused by complete ductal obstruction. The support membrane, with its gradient diameter design of the inflation tube, gradually expands when the reservoir is compressed, achieving an adaptive fit with the pancreatic duct wall and reducing the possibility of pancreatic duct stent slippage.

[0015] Optionally, the extrusion assembly includes an extrusion ring and an extrusion spring;

[0016] The support tube is provided with a mounting groove for mounting the air storage bag, the extrusion ring slides axially in the mounting groove, and the end surface of the extrusion ring is connected to the side of the air storage bag away from the transmission tube;

[0017] The extrusion spring is installed in the installation groove, and the extrusion spring drives the extrusion ring to squeeze the air storage bag.

[0018] By adopting the above technical solution, the extrusion spring applies constant pressure to the air storage bag through the extrusion ring, causing the support membrane to produce radial deformation, thereby ensuring effective support without damaging the pancreatic duct mucosa.

[0019] Optionally, the control assembly includes a control block, a control column, a connecting column, a connecting block and an elastic strip;

[0020] The control column is radially slidably inserted into the support tube, and a plug-in slot is formed on the side of the mounting groove away from the drainage hole, and the control column is inserted into the plug-in slot;

[0021] The inner wall of the support tube is provided with a sliding hole connected to the mounting groove, and the control block slides in the sliding hole;

[0022] The elastic strip is arranged on the inner peripheral side wall of the extrusion ring and is located in the sliding hole, and the elastic strip drives the control block to partially protrude into the drainage hole;

[0023] The connecting post is arranged on the side wall of the control block away from the drainage hole, the connecting block is arranged on the end of the connecting post away from the control block, and the extrusion ring is provided with a sliding groove for the connecting post and the connecting block to slide up and down;

[0024] The control column slides and protrudes into the sliding groove. The end of the control column is formed with a connecting groove for the connecting column to be inserted. The control column is provided with a clamping groove that is connected to the connecting groove and is clamped by the connecting block. The connecting block can slide in the clamping groove along the axial direction of the support tube.

[0025] When the wire passes through the control block and the wall of the drainage hole, the connecting block is clamped into the clamping groove, and the elastic strip enters a compressed state;

[0026] When the wire and the control block are separated from each other, the elastic strip pushes the control block toward the drainage hole, and the control column slides out of the plug-in slot, and the connecting block is located in the sliding slot.

[0027] By adopting the above technical solution, the connecting block is snapped into the snap-in groove, and then the control block slides toward the drainage hole under the action of the elastic strip, and the lock is released at the moment the wires are separated, so that the extrusion spring immediately releases the stored elastic potential energy.

[0028] Optionally, a connecting rope is slidably passed through the support tube, one end of the connecting rope is connected to the bottom of the extrusion ring, and the other end is connected to the control block;

[0029] When the squeezing ring squeezes the air storage bag and the wire is separated from the control block, the connecting rope pulls the control block to slide into the installation groove.

[0030] By adopting the above technical solution, the connecting rope forms a dynamic linkage between the extrusion ring and the control block. When the extrusion ring squeezes the air storage bag, the connecting rope drives the control block to slide into the installation groove.

[0031] Optionally, the connecting block is obliquely formed with a guiding surface for guiding the connecting block to be clamped into the clamping groove.

[0032] By adopting the above technical solution, the guide surface guides the connecting block to be clamped into the clamping groove.

[0033] Optionally, a sliding surface for sliding of the wire is formed on a side of the control block away from the guide portion, and the sliding surface is away from the extrusion ring.

[0034] By adopting the above technical solution, the guide wire slides on the sliding surface, pushing the control block away from the drainage hole.

[0035] Optionally, the support tube is provided with a plurality of communication holes that are evenly spaced apart and connect the drainage hole and the accommodating groove.

[0036] By adopting the above technical solution, the liquid in the pancreatic duct can flow along the support membrane to the holding groove, and then the liquid flows into the drainage hole through the connecting hole, greatly improving the liquid outflow efficiency in the pancreatic duct.

[0037] Optionally, an exhaust pipe is passed through the support tube, one end of the exhaust pipe is connected to the air storage bag and is in communication with the air storage bag, and the other end is arranged on the support tube facing away from the guide part, and the exhaust pipe is closed on the side away from the guide part.

[0038] By adopting the above technical solution, when the support tube needs to be removed, the exhaust pipe is punctured to allow the air to be discharged. At this time, the support film is relaxed, which reduces the difficulty of removing the support tube.

[0039] In summary, this application has at least one of the following beneficial effects:

[0040] 1. The layout of the liquid inlet adjacent to the guide portion can establish a pancreatic fluid drainage channel during the initial stage of stent placement, preventing the increase in pancreatic duct pressure caused by complete ductal obstruction. The support membrane, through the gradient diameter design of the inflation tube, forms a gradual expansion when the air bag is pressurized, achieving adaptive fit with the pancreatic duct wall and reducing the possibility of pancreatic duct stent slippage;

[0041] 2. When the support tube needs to be removed, puncture the exhaust pipe to allow the air to escape. This will loosen the support film and make it easier to remove the support tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic diagram of the overall structure of the support tube when installed in an embodiment of the present application;

[0043] Figure 2 This is a schematic diagram of the internal cross-section of the support tube when installed in an embodiment of the present application;

[0044] Figure 3 yes Figure 2 A magnified schematic diagram of part A;

[0045] Figure 4 yes Figure 2 An enlarged schematic diagram of part B;

[0046] Figure 5 It is a schematic diagram of the internal cross-section of the support tube in the embodiment of the present application.

[0047] Figure markings: 1. Support tube; 11. Drainage hole; 12. Guide part; 13. Receiving groove; 131. Connecting hole; 14. Liquid inlet hole; 15. Air storage bag; 16. Transmission tube; 17. Mounting groove; 18. Insertion groove; 19. Sliding hole; 2. Support membrane; 21. First opening; 22. Second opening; 23. Inflation tube; 231. Connecting tube; 3. Extrusion assembly; 31. Extrusion ring; 311. Sliding groove; 32. Extrusion spring; 4. Control assembly; 41. Control block; 411. Sliding surface; 42. Control column; 421. Connecting groove; 422. Clamping groove; 43. Connecting column; 44. Connecting block; 441. Guide surface; 45. Elastic strip; 5. Connecting rope; 6. Exhaust pipe. DETAILED DESCRIPTION

[0048] The following is combined with Figure 1-5 This application is described in further detail.

[0049] The embodiments of the present application disclose a plastic pancreatic duct stent.

[0050] See also Figure 1 and Figure 2 The plastic pancreatic duct stent comprises a support tube 1, a drainage hole 11 is formed in the support tube 1, and the drainage hole 11 extends along the axial direction of the support tube 1. The support tube 1 is a tubular structure and is made of plastic.

[0051] One end of the support tube 1 is inclined to form a guide portion 12, which is convenient for guiding the support tube 1 into the pancreatic duct. The wall of the support tube 1 is provided with a liquid inlet hole 14, and there are multiple liquid inlet holes 14 that are evenly spaced, and the liquid inlet hole 14 is located at the guide portion 12 and a position adjacent to the guide portion 12. Before installing the support tube 1, first detachably connect the pusher to the tail of the support tube 1, then pass the guide wire through the pusher and the drainage hole 11, and then guide the guide wire into the pancreatic duct until the guide wire reaches the required installation position of the support tube 1; then push the support tube 1 through the pusher, and the support tube 1 moves along the guide wire to the required installation position in the pancreatic duct, and finally retract the guide wire until the guide wire is separated from the support tube 1, and then control the pusher to separate from the support tube 1. In this application, the guidance and pushing of the support tube 1 by the guide wire and the pusher are existing technologies, so no further details will be given here.

[0052] See also Figure 2 and Figure 3The plastic pancreatic duct stent also includes a support membrane 2 and an inflation tube 23. The support membrane 2 is made of plastic film, connected end to end, and arranged around the support tube 1. The support membrane 2 is arranged in a trumpet-shaped structure, with two openings on both sides of the support membrane 2 being a first opening 21 and a second opening 22. The diameter of the first opening 21 is larger than that of the second opening 22, and one side of the second opening 22 is fixedly connected to the support tube 1. The outer wall of the support tube 1 is provided with a receiving groove 13, which extends circumferentially, and the support membrane 2 is located within the receiving groove 13.

[0053] The inflation tube 23 is arranged in a circular ring and is fixedly installed in the support membrane 2. There are multiple inflation tubes 23 and they are evenly spaced between the first opening 21 and the second opening 22. The diameter of the inflation tube 23 gradually decreases from the first opening 21 to the second opening 22.

[0054] A connecting tube 231 is fixedly mounted within the support membrane 2, connecting adjacent inflation tubes 23 via the connecting tubes 231. An air storage bag 15 is fixedly mounted within the support tube 1. The air storage bag 15 is an annular structure, hollow and filled with air. A transmission tube 16 is fixedly mounted within the support tube 1. One end of the transmission tube 16 is fixedly connected to the air storage bag 15, and the other end is fixedly connected to the connecting tube 231.

[0055] See also Figure 3 and Figure 4 The plastic pancreatic duct stent also includes an extrusion assembly 3, which is mounted on the support tube 1. During use, the extrusion assembly 3 compresses the air storage bag 15. The air in the air storage bag 15 then flows through the transmission tube 16 into the connecting tube 231, and then through the connecting tube 231 into the inflation tube 23, causing the support membrane 2 to expand out of the receiving groove 13. The support tube 1 is provided with multiple, evenly spaced communication holes 131. The two side openings of the communication holes 131 connect to the drainage hole 11 and the receiving groove 13, respectively. When the support tube 1 is positioned within the pancreatic duct and the support membrane 2 is expanded, the outer wall of the support membrane 2 abuts the inner wall of the pancreatic duct, enhancing the installation stability of the support tube 1. Furthermore, liquid in the pancreatic duct can flow along the inner wall of the support membrane 2 toward the support tube 1, ultimately flowing through the communication holes 131 into the drainage hole 11. This improves the efficiency of liquid outflow from the pancreatic duct and reduces the possibility of fluid outflow being restricted by the gap between the outer wall of the support tube 1 and the pancreatic duct.

[0056] The extrusion assembly 3 includes an extrusion ring 31 and an extrusion spring 32. A mounting groove 17 is defined within the support tube 1. The mounting groove 17 extends circumferentially, and the air bag 15 is mounted within the mounting groove 17. The outer wall of the air bag 15 near the guide portion 12 is fixedly connected to the wall of the mounting groove 17. The extrusion ring 31 is mounted within the mounting groove 17. It is an annular structure and slides axially along the support tube 1. The end surface of the extrusion ring 31 near the guide portion 12 is connected to the end of the air bag 15 away from the guide portion 12. The extrusion spring 32 is mounted within the mounting groove 17. One end of the extrusion spring 32 abuts the side of the extrusion ring 31 away from the air bag 15, and the other end abuts the wall of the mounting groove 17 away from the guide portion 12. When the extrusion spring 32 is released, it drives the extrusion ring 31 to squeeze the air bag 15, allowing the air in the air bag 15 to flow into the inflation tube 23.

[0057] An exhaust pipe 6 is fixedly mounted on the support tube 1. This foldable hose is made of plastic film. One end of the exhaust pipe 6 is fixedly connected to and communicates with the air reservoir 15. The other end is located on the end of the support tube 1 facing away from the guide 12. The end of the exhaust pipe 6, facing away from the extrusion ring 31, is sealed. To remove the support tube 1, puncture the exhaust pipe 6 to allow the air to escape. The support tube 1 can then be easily removed.

[0058] The support tube 1 is equipped with a control assembly 4. Initially, the control assembly 4 locks the compression plate, expanding the air storage bag 15. The support membrane 2 contracts within the receiving groove 13, facilitating insertion of the support tube 1 into the pancreatic duct. When the guidewire slides out of the drainage hole 11, the control assembly 4 controls the compression ring 31 to enter a free compression state, allowing it to compress the air storage bag 15.

[0059] The control assembly 4 includes a control block 41, a control post 42, a connecting post 43, a connecting block 44, and an elastic strip 45. The control post 42 is slidably inserted into the support ring and slides radially along the support ring. A plug-in slot 18 is defined on the side of the mounting groove 17 away from the drainage hole 11. During use, the control post 42 is inserted into the plug-in slot 18, and the extrusion ring 31 is locked.

[0060] See also Figure 4 and Figure 5 The inner wall of the support tube 1 is provided with a sliding hole 19, which communicates with the mounting groove 17 and the drainage hole 11. The control column 42 is aligned with the sliding hole 19, and the control block 41 slides in the sliding hole 19. The control block 41 is inclined and has a sliding surface 411 formed on the side away from the guide portion 12. The sliding surface 411 is located away from the extrusion ring 31.

[0061] See also Figure 2 and Figure 4The elastic strip 45 is fixedly connected to the inner circumferential sidewall of the extrusion ring 31. The elastic strip 45 is tilted toward the side of the extrusion ring 31, away from the guide portion 12 and toward the drainage hole 11. The elastic strip 45 is located within the slide hole 19. In the initial state, the elastic strip 45 is elastically released, and the drive control block 41 partially protrudes into the drainage hole 11.

[0062] The connecting post 43 is fixedly connected to the control block 41 and is located on the vertical sidewall of the control block 41 away from the drainage hole 11. The connecting block 44 is fixedly connected to the end of the connecting post 43 away from the control block 41. The connecting block 44 has a guide surface 441 formed on the side away from the connecting post 43, which is inclined and located away from the control block 41. The extrusion ring 31 defines a sliding groove 311, in which the connecting post 43 and the connecting block 44 slide up and down. In the initial state, the connecting post 43 is aligned with the control post 42, and the control post 42 partially protrudes into the sliding groove 311.

[0063] See also Figure 4 and Figure 5 A connecting groove 421 is formed on one end of the control column 42 near the control block 41, and the connecting groove 421 is aligned with the connecting column 43. The control column 42 is provided with a snap-fitting groove 422, which is located on one side of the groove wall of the connecting groove 421. The snap-fitting groove 422 is adapted to the connecting block 44, and the connecting groove 421 and the snap-fitting groove 422 respectively extend to the outside of the control column 42, so that when the extrusion ring 31 slides, the connecting column 43 can slide axially along the support tube 1 in the connecting groove 421, and the connecting block 44 can slide axially along the support tube 1 in the snap-fitting groove 422.

[0064] When the guide wire slides through the drainage hole 11, it first slides on the sliding surface 411, pushing the control block 41 to slide away from the drainage hole 11, pushing the connecting post 43 to insert into the connecting groove 421. At this time, the control post 42 first slides and connects with the guide surface 441, causing the connecting post 43 to elastically deform. When the connecting block 44 is aligned with the engaging groove 422, the elastic deformation of the connecting post 43 is restored, driving the connecting block 44 to engage in the engaging groove 422. When the control block 41 slides away from the drainage hole 11, the elastic strip 45 enters a compressed state. When the guide wire slides outward from the drainage hole 11 until it is separated from the control block 41, the elastic strip 45 is elastically released, pushing the control block 41 toward the drainage hole 11, causing the control column 42 to slide out of the plug-in slot 18. At this time, the connecting block 44 is located in the sliding slot 311; at the same time, the extrusion spring 32 is elastically released, pushing the extrusion ring 31 to squeeze the air bag 15, and the connecting column 43 and the connecting block 44 first slide into the sliding slot 311 and then slide out of the sliding slot 311.

[0065] A connecting cord 5 slides through the support tube 1. One end of the connecting cord 5 is fixedly connected to the side of the extrusion ring 31 away from the air reservoir 15, and the other end is fixedly connected to the sidewall of the control block 41 away from the drainage hole 11. When the guide wire separates from the control block 41 and the extrusion ring 31 squeezes the air reservoir 15, the connecting cord 5 pulls the control block 41 into the mounting groove 17, reducing the possibility that the control block 41 will restrict the flow of liquid in the drainage hole 11.

[0066] The implementation principle of a plastic pancreatic duct stent in the embodiment of the present application is as follows:

[0067] Before installing the support tube 1, the pusher is detachably connected to the rear end of the support tube 1. The guidewire is then passed through the pusher and the drainage hole 11. The guidewire slides along the guide surface, pushing the control block 41 away from the drainage hole 11. The connecting post 43 is then inserted into the connecting groove 421, and the connecting block 44 is snapped into the snap-in groove 422. The guidewire is then guided into the pancreatic duct until it reaches the desired installation position for the support tube 1. The pusher then pushes the support tube 1, allowing it to follow the guidewire to the desired installation position within the pancreatic duct. Finally, the guidewire is retracted until it separates from the control block 41. The elastic strip 45 pushes the control block 41 toward the drainage hole 11, causing the connecting post 43 and the connecting block 44 to drive the control post 42 out of the insertion groove 18. The compression spring 32 is then released, pushing the compression ring 31 to squeeze the air reservoir 15, causing the support membrane 2 to expand out of the receiving groove 13 until it abuts the pancreatic duct, thereby increasing the support strength of the support tube 1. When the guide wire is separated from the support tube 1, the pusher is controlled to separate from the support tube 1. The entire installation process is simple, and the pancreatic duct stent can be pushed and placed in a minimally invasive manner, while greatly improving the installation stability of the support tube 1.

[0068] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A plastic pancreatic duct stent, characterized by: The support tube (1) comprises a support tube (1), wherein a drainage hole (11) extending in the axial direction is provided in the support tube (1), a guide portion (12) is provided at one end of the support tube (1), and an accommodating groove (13) extending in the circumferential direction is provided on the outer wall of the support tube (1); The support tube (1) has a plurality of liquid inlet holes (14) evenly spaced apart on its wall; A support film (2) is connected end to end and is arranged around the support tube (1), the two side ends of the support film (2) are respectively a first opening portion (21) and a second opening portion (22), the diameter of the first opening portion (21) is larger than the diameter of the second opening portion (22), and the support tube (1) is located on one side of the second opening portion (22) and is located in the receiving groove (13); an inflation tube (23) disposed in a circumferential manner within the support membrane (2), wherein a plurality of the inflation tubes (23) are evenly spaced and disposed between the first opening (21) and the second opening (22), and wherein the diameter of the inflation tube (23) decreases from the first opening (21) toward the second opening (22); A connecting tube (231) communicating with the inflation tube (23) is provided in the support membrane (2), an air storage bag (15) is provided in the support tube (1), and a transmission tube (16) communicating with the air storage bag (15) and the connecting tube (231) is provided in the support tube (1); An extrusion assembly (3) is arranged on the support tube (1), and the extrusion assembly (3) squeezes the air storage bag (15), at which time the support membrane (2) is expanded to the outside of the accommodating groove (13); The support tube (1) is provided with a control component (4), and when the wire slides out of the drainage hole (11), the control component (4) controls the extrusion component (3) to enter an extrusion state.

2. The plastic pancreatic duct stent according to claim 1, characterized in that: The extrusion assembly (3) comprises an extrusion ring (31) and an extrusion spring (32); The support tube (1) is provided with a mounting groove (17) for mounting the air storage bag (15), the extrusion ring (31) slides axially in the mounting groove (17), and the end surface of the extrusion ring (31) is connected to the side of the air storage bag (15) away from the transmission tube (16); The extrusion spring (32) is installed in the installation groove (17), and the extrusion spring (32) drives the extrusion ring (31) to squeeze the air storage bag (15).

3. The plastic pancreatic duct stent according to claim 2, characterized in that: The control assembly (4) includes a control block (41), a control column (42), a connecting column (43), a connecting block (44) and an elastic strip (45); The control column (42) is radially slidably inserted into the support tube (1); a plug-in slot (18) is provided on a side of the mounting groove (17) away from the drainage hole (11); and the control column (42) is inserted into the plug-in slot (18); The inner wall of the support tube (1) is provided with a sliding hole (19) communicating with the mounting groove (17), and the control block (41) slides in the sliding hole (19); The elastic strip (45) is arranged on the inner peripheral side wall of the extrusion ring (31) and is located in the sliding hole (19), and the elastic strip (45) drives the control block (41) to partially protrude into the drainage hole (11); The connecting column (43) is arranged on a side wall of the control block (41) away from the drainage hole (11), the connecting block (44) is arranged at an end of the connecting column (43) away from the control block (41), and the extrusion ring (31) is provided with a sliding groove (311) for the connecting column (43) and the connecting block (44) to slide up and down; The control column (42) slides and protrudes into the sliding groove (311); a connecting groove (421) for inserting the connecting column (43) is formed at the end of the control column (42); the control column (42) is provided with a clamping groove (422) that is in communication with the connecting groove (421) and for clamping the connecting block (44); the connecting block (44) can slide in the clamping groove (422) along the axial direction of the support tube (1); When the wire passes through the control block (41) and the wall of the drainage hole (11), the connecting block (44) is snapped into the snap-fit ​​groove (422), and at this time the elastic strip (45) enters a compressed state; When the wire and the control block (41) are separated from each other, the elastic strip (45) pushes the control block (41) toward the drainage hole (11), and the control column (42) slides out of the plug-in slot (18), and the connecting block (44) is located in the sliding slot (311).

4. The plastic pancreatic duct stent according to claim 3, characterized in that: A connecting rope (5) is slidably passed through the support tube (1), one end of the connecting rope (5) is connected to the bottom of the extrusion ring (31), and the other end is connected to the control block (41); When the squeezing ring (31) squeezes the air storage bag (15) and the wire is separated from the control block (41), the connecting rope (5) pulls the control block (41) to slide into the installation groove (17).

5. The plastic pancreatic duct stent according to claim 4, characterized in that: The connecting block (44) is obliquely formed with a guiding surface (441) for guiding the connecting block (44) to be clamped into the clamping groove (422).

6. The plastic pancreatic duct stent according to claim 3, characterized in that: A sliding surface (411) for sliding of the wire is formed at an angle on a side of the control block (41) away from the guide portion (12), and the sliding surface (411) is away from the extrusion ring (31).

7. The plastic pancreatic duct stent according to claim 1, characterized in that: The support tube (1) is evenly spaced and provided with a plurality of communication holes (131) communicating with the drainage hole (11) and the accommodating groove (13).

8. The plastic pancreatic duct stent according to claim 1, characterized in that: The support tube (1) is provided with an exhaust pipe (6), one end of the exhaust pipe (6) is connected to the air storage bag (15) and is in communication therewith, and the other end is arranged on the support tube (1) facing away from the guide portion (12), and the exhaust pipe (6) is closed on the side away from the guide portion (12).

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