Multifunctional narrow biliary tract drainage tube

Abstract

The present application relates to the technical field of biliary drainage tube, and discloses a multifunctional narrow biliary drainage tube, which comprises a sleeve, a drainage catheter and an auxiliary fixing mechanism, the sleeve is fixedly connected with a connecting sleeve, a cavity is formed in the sleeve, and the side wall of the sleeve is made of flexible elastic material; after gas is filled into the cavity, the side wall of the sleeve can be expanded. In the present application, the flexible expandable sleeve is combined with the design of multiple sets of expansion sleeve structures, which can be self-adaptively expanded and dilated according to the narrow degree of the biliary tract of the patient, can uniformly dilate and shape the local and multi-segment narrow biliary tract, does not need to additionally replace the dilation instrument for auxiliary operation during the operation, effectively simplifies the operation process, reduces the wound irritation and intraoperative trauma risk caused by step-by-step operation, solves the defects that the traditional drainage tube has poor adaptability and cannot self-adaptively adjust the pipe diameter, and greatly improves the adaptability and minimally invasive treatment effect of complex narrow biliary tract surgery.

Description

Technical Field

[0001] This invention relates to the field of biliary drainage tube technology, and more particularly to a multifunctional biliary drainage tube for strictures. Background Technology

[0002] Biliary stricture and biliary obstruction are common clinical conditions in hepatobiliary surgery, often caused by factors such as biliary inflammation, stone irritation, postoperative scar hyperplasia, and tumor compression. They can easily lead to complications such as obstructed bile excretion, increased intrabiliary pressure, jaundice, and recurrent biliary infections, severely damaging liver function and endangering the patient's life. Currently, the main clinical approach for various biliary strictures is the placement of biliary drainage tubes for bile decompression and drainage, as well as postoperative biliary support. This is a core method for minimally invasive treatment and postoperative rehabilitation.

[0003] Existing traditional biliary drainage tubes have a relatively simple structural design, mostly being simple drainage tubes with a fixed diameter. The overall diameter cannot be adaptively adjusted, and they can only be adapted to regular unobstructed bile ducts. They have poor adaptability to lesions with narrow diameters or uneven degrees of stenosis, and cannot adaptively expand and reshape stenotic bile ducts. They often require the use of special dilators in a step-by-step surgical procedure, increasing the number of surgical steps and the risk of intraoperative trauma. Therefore, a multifunctional stenotic biliary drainage tube is proposed to solve the above problems. Summary of the Invention

[0004] To overcome the above shortcomings, this invention provides a multifunctional biliary drainage tube for stenosis, which aims to improve the problems of traditional biliary drainage tubes in the prior art, such as fixed tube diameter, inability to adapt to stenotic biliary tracts for expansion and shaping, poor adaptability to lesions with uneven width, the need for additional dilation instruments in clinical practice, complicated surgical procedures, high risk of intraoperative trauma, and difficulty in meeting the needs of minimally invasive drainage treatment for complex stenotic biliary tracts.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a multifunctional biliary drainage tube for strictures, comprising: A sleeve, on which a connecting sleeve is fixedly connected, has a cavity in it, and the sidewall of the sleeve is made of a flexible elastic material. After gas is filled into the cavity, the sidewall of the sleeve can expand. A drainage conduit, wherein the drainage conduit is sleeved by a sleeve, the drainage conduit is provided with a drainage structure, and a connector is fixedly connected to the drainage conduit, the connector and the connecting sleeve being detachably connected through a connecting structure; An auxiliary fixing mechanism is provided, comprising a connecting pipe, a connecting component, an air supply assembly, and a pressure sensor. The connecting pipe is fixedly connected to the sleeve, and its two ends are respectively connected to the cavity and the connecting component. The air supply assembly is disposed on the connecting component, and the pressure sensor is fixedly installed on the connecting component.

[0006] As a further description of the above technical solution: The drainage structure consists of multiple sets of drainage holes on the drainage conduit and flow channels in the drainage conduit.

[0007] As a further description of the above technical solution: A fixing member is fixedly connected to the drainage tube, and a pull wire is fixedly connected to the end of the drainage tube away from the fixing member, and the pull wire passes through the drainage tube and is connected to the fixing member.

[0008] As a further description of the above technical solution: Multiple sets of expansion sleeves are arranged in an array on the sleeve, and a connecting groove is opened in the sleeve. The expansion sleeve and the connecting groove are connected through a port opened on the sleeve.

[0009] As a further description of the above technical solution: The connecting component includes a three-way valve and a second connecting pipe. The three-way valve is connected to the first connecting pipe, and the second connecting pipe is connected to the three-way valve. The pressure sensor is fixedly installed on the second connecting pipe.

[0010] As a further description of the above technical solution: The air replenishment component consists of an airbag and a one-way exhaust port and a one-way air inlet on the airbag. The one-way exhaust port is connected to the end of the connecting pipe away from the three-way valve.

[0011] As a further description of the above technical solution: The three-way valve is connected to a connecting pipe three, and the end of the connecting pipe three away from the three-way valve is connected to the connecting groove.

[0012] As a further description of the above technical solution: The connecting structure includes a mating block, a sliding ring, an elastic plug, a fixing ring, and an elastic telescopic rod. The mating block is fixedly connected to one end of the connecting sleeve near the connecting member. The mating block has a hemispherical opening. The sliding ring is slidably connected to the connecting member. The inner surface of the sliding ring has a hemispherical opening. The connecting member has an inner groove, and the elastic plug is disposed in the inner groove. The fixing ring is fixedly connected to the outer wall of the connecting member. The elastic telescopic rod is fixedly installed on the fixing ring, and the telescopic end of the elastic telescopic rod is fixedly connected to the sliding ring.

[0013] As a further description of the above technical solution: The elastic connector consists of a connecting ring, a protruding rod, a protrusion, and a return spring. The connecting ring and the inner groove are elastically connected by the return spring. The connecting ring is slidably connected in the inner groove. The protruding rod and the protrusion are fixedly connected to both sides of the connecting ring. The first hemispherical opening matches the protrusion, and the second hemispherical opening matches the protruding rod.

[0014] As a further description of the above technical solution: A first limiting ring is fixedly connected to the outer wall of the connecting sleeve, and a second limiting ring is fixedly connected to the outer wall of the connecting member.

[0015] The present invention has the following beneficial effects: 1. In this invention, by adopting a flexible expandable sheath combined with a multi-group expandable sheath structure design, it can adaptively expand and dilate according to the degree of biliary stenosis of the patient. It can uniformly expand and shape local and multi-segment stenotic biliary tracts without the need for additional replacement of dilation instruments during the operation, effectively simplifying the surgical procedure, reducing wound irritation and intraoperative trauma risks caused by step-by-step operation, and solving the defects of traditional drainage tubes with poor adaptability and inability to adaptively adjust the tube diameter, thus greatly improving the adaptability and minimally invasive treatment effect of complex stenotic biliary tract surgery.

[0016] 2. In this invention, the pressure sensor and the gas replenishment component work together to monitor the internal gas pressure of the cannula in real time, realize stable pressure adaptive gas replenishment adjustment, ensure that the cannula and the expansion sleeve are always in close contact with the inner wall of the bile duct, avoid problems such as loosening of the fit, tube displacement, slippage, etc., effectively improve the stability and fit of the drainage tube, prevent bile leakage, drainage deviation, bile duct restenosis and other problems during long-term indwelling, continuously ensure the effect of bile duct decompression and drainage, reduce the incidence of postoperative complications, and improve the safety of postoperative recovery of patients.

[0017] 3. In this invention, the detachable connection structure enables quick disassembly and separation of the sheath and the drainage catheter. Combined with the end pull wire assisted removal structure, the drainage catheter can be quickly cleaned and replaced individually without the need to remove the entire tube. The operation is convenient and efficient. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a multifunctional biliary drainage tube for strictures proposed in this invention; Figure 2 This is a partial cross-sectional view of a multifunctional biliary drainage tube for strictures proposed in this invention. Figure 1 ; Figure 3 This is a partial structural schematic diagram of a multifunctional biliary drainage tube for strictures proposed in this invention; Figure 4 This invention proposes a multifunctional biliary drainage tube for strictures. Figure 2 Schematic diagram of structure A in the middle; Figure 5 This invention proposes a multifunctional biliary drainage tube for strictures. Figure 2 Schematic diagram of structure B in the middle; Figure 6 This is a partial cross-sectional view of a multifunctional biliary drainage tube for strictures proposed in this invention. Figure 2 ; Figure 7 This invention proposes a multifunctional biliary drainage tube for strictures. Figure 6 Schematic diagram of the C-structure.

[0019] Legend: 1. Sleeve; 2. Connecting sleeve; 3. Drainage conduit; 4. Connector; 5. Auxiliary fixing mechanism; 6. Expansion sleeve; 21. Connecting block; 22. Hemispherical opening one; 23. Limiting ring one; 31. Drainage hole; 32. Fixing wire; 33. Pull wire; 41. Sliding ring; 42. Hemispherical opening two; 43. Inner groove; 44. Connecting ring; 45. Protruding rod; 46. Protrusion; 47. Limiting ring two; 48. Fixing ring; 49. Elastic telescopic rod; 51. Connecting pipe one; 52. Three-way valve; 53. Connecting pipe two; 54. Airbag; 55. One-way exhaust port; 56. One-way air inlet; 57. Pressure sensor; 58. Connecting pipe three; 61. Through port; 101. Cavity; 102. Connecting groove. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Reference Figures 1-4This invention provides an embodiment of a multifunctional biliary stricture drainage tube, comprising a cannula 1, a drainage conduit 3, and an auxiliary fixing mechanism 5. A connecting sleeve 2 is fixedly connected to the cannula 1. A cavity 101 is formed in the cannula 1, and the sidewall of the cannula 1 is made of a flexible, elastic material. After gas is filled into the cavity 101, the sidewall of the cannula 1 can expand. The drainage conduit 3 is fitted onto the cannula 1. The drainage conduit 3 is provided with a drainage structure, and a connector 4 is fixedly connected to the drainage conduit 3. The connector 4 and the connecting sleeve 2 are detachably connected via the connecting structure. The auxiliary fixing mechanism 5 includes a connecting tube 51, a connecting element, and a gas replenishment component. The system includes a pressure sensor 57, a connecting tube 51 fixedly connected to the sleeve 1, with both ends of the connecting tube 51 connected to the cavity 101 and the connecting member, respectively. An air-injection assembly is mounted on the connecting member, and the pressure sensor 57 is fixedly installed on the connecting member. The sleeve 1 serves as the main support, made of flexible elastic material, allowing for inflation and expansion deformation to adapt to different degrees of biliary stenosis, achieving adaptive expansion and close support of the biliary wall. The internally fitted drainage catheter 3 independently handles bile drainage. A detachable connection structure allows for quick disassembly and separation of the sleeve 1 and drainage catheter 3, facilitating postoperative maintenance and replacement. The auxiliary fixation mechanism 5 monitors the internal air pressure of the sleeve 1 in real time and dynamically injects and stabilizes the air pressure, ensuring continuous and stable expansion support of the sleeve 1, effectively improving the stability of the indwelling tubing and preventing problems such as loosening, detachment, and poor fit.

[0022] Furthermore, the drainage structure consists of multiple sets of drainage holes 31 set on the drainage conduit 3 and the flow channel in the drainage conduit 3. The multiple sets of evenly distributed drainage holes 31, together with the internal through flow channel, form a complete drainage channel, which can collect the stagnant bile inside the bile duct from all directions, increase the drainage coverage, avoid the problems of easy blockage and large drainage dead angles in single-hole drainage, and can continuously, stably and smoothly complete the bile decompression drainage, effectively reduce the internal pressure of the bile duct, ensure the patency of the bile duct, and improve the stability and effectiveness of stricture bile duct drainage treatment.

[0023] Furthermore, a fixing member 32 is fixedly connected to the drainage conduit 3, and a pull wire 33 is fixedly connected to the end of the drainage conduit 3 away from the connector 4. The pull wire 33 passes through the drainage conduit 3 and is connected to the fixing member 32. The fixing member 32 securely limits the end of the pull wire 33 to prevent the pull wire 33 from falling off or loosening, and to ensure that the pull wire 33 structure is generally reliable. By tightening the pull wire 33, the end of the drainage conduit 3 away from the connector 4 is bent, thereby fixing the drainage conduit 3.

[0024] Reference Figure 2 , Figure 3 and Figure 5The connecting components include a three-way valve 52 and a second connecting pipe 53. The three-way valve 52 is connected to a first connecting pipe 51, and the second connecting pipe 53 is connected to the three-way valve 52. A pressure sensor 57 is fixedly installed on the second connecting pipe 53. The air supply component consists of an air bladder 54 and a one-way exhaust port 55 and a one-way air inlet 56 on the air bladder 54. The one-way exhaust port 55 is connected to the end of the second connecting pipe 53 away from the three-way valve 52. When it is necessary to dilate a narrow bile duct, the patient's bile duct is first punctured by a puncture needle, and then a guidewire is inserted into the bile duct to guide the cannula 1 into the bile duct. By pressing the air bladder 54, the gas in the air bladder 54 is squeezed out through the one-way exhaust port 55 into the second connecting pipe 53, then through the three-way valve 52 into the first connecting pipe 51, and then into the cavity 101, causing the cannula 1 to expand. Then the air bladder 54 is released. The balloon 54 is reset, and outside air enters the balloon 54 through the one-way air inlet 56. By repeatedly pressing the balloon 54, the narrowed bile duct is expanded and reshaped. There is no need to change the dilation instrument during the operation, which effectively simplifies the surgical procedure and reduces the wound irritation and intraoperative trauma risks caused by step-by-step operation. It solves the defects of traditional drainage tubes, such as poor adaptability and inability to adaptively adjust the tube diameter. It greatly improves the adaptability and minimally invasive treatment effect of complex narrowed bile duct surgery. In addition, the use of pressure sensor 57 can monitor the air pressure status inside the cannula 1 in real time, realize stable pressure adaptive air replenishment adjustment, ensure that the cannula 1 always fits the inner wall of the bile duct, and avoid problems such as loosening of the fit, tube displacement, and slippage. It effectively improves the stability and fit of the drainage catheter 3 and prevents problems such as bile leakage, drainage deviation, and bile duct restenosis during long-term indwelling, and continuously ensures the effect of bile duct decompression and drainage.

[0025] Furthermore, multiple sets of expansion sleeves 6 are arrayed on the sleeve 1. A connecting groove 102 is opened in the sleeve 1. The expansion sleeves 6 and the connecting groove 102 are connected through a port 61 opened on the sleeve 1. A connecting pipe 3 58 is connected to the three-way valve 52. The end of the connecting pipe 3 58 away from the three-way valve 52 is connected to the connecting groove 102. After the sleeve 1 expands the bile duct, the three-way valve 52 is adjusted to close the connection of the connecting pipe 1 51 and open the connection with the connecting pipe 3 58. At this time, by pressing the air bag 54, the gas enters the connecting groove 102 through the connecting pipe 3 58 and then enters the expansion sleeve 6 through the port 61, causing the expansion sleeve 6 to expand and fix the sleeve 1 in the bile duct, thereby improving the stability of the sleeve 1.

[0026] Reference Figures 6-7The connecting structure includes a mating block 21, a sliding ring 41, an elastic connector, a fixing ring 48, and an elastic telescopic rod 49. The mating block 21 is fixedly connected to one end of the connecting sleeve 2 near the connecting member 4. The mating block 21 has a hemispherical opening 22. The sliding ring 41 is slidably connected to the connecting member 4. The inner surface of the sliding ring 41 has a hemispherical opening 42. The connecting member 4 has an inner groove 43, and the elastic connector is disposed in the inner groove 43. The fixing ring 48 is fixedly connected to the outer wall of the connecting member 4. The elastic telescopic rod 49 is fixedly installed on the fixing ring 48, and the telescopic end of the elastic telescopic rod 49 is fixedly connected to the sliding ring 41. The elastic connector consists of a connecting ring 44, a protruding rod 45, a protrusion 46, and a return spring. The connecting ring 44 and the inner groove 43 are elastically connected by the return spring. The connecting ring 44 is slidably connected to the inner groove 43. The protruding rod 45 and the protrusion 46 are respectively fixedly connected to both sides of the connecting ring 44. The hemispherical opening 22 and the protrusion 49 are slidably connected to the inner groove 43. Block 46 is matched, and hemispherical opening 42 is matched with protruding rod 45. When fixing the drainage tube 3 and the sleeve 1, the connecting sleeve 2 and the connecting piece 4 abut against each other, so that the connecting block 21 is inserted into the connecting piece 4. Then, the sliding ring 41 is pushed to stretch the telescopic end of the elastic telescopic rod 49, so that the hemispherical opening 42 of the sliding ring 41 moves above the protruding rod 45. At this time, the connecting block 21 squeezes the protruding block 46, so that the connecting ring 44 can drive the protruding rod 45 to move and compress the return spring. After the connecting block 21 is fully inserted into the connecting piece 4, the protruding block 46 is locked into the hemispherical opening 22 under the reset action of the return spring, thus fixing the connecting block 21. At the same time, by releasing the sliding ring 41, the telescopic end of the elastic telescopic rod 49 drives the sliding ring 41 to reset, so that the sliding ring 41 can block the protruding rod 45, ensuring the stability of the protruding block 46 being locked into the hemispherical opening 22, thereby improving the stability of the connection between the connecting sleeve 2 and the connecting piece 4.

[0027] In addition, a limiting ring 23 is fixedly connected to the outer wall of the connecting sleeve 2, and a limiting ring 47 is fixedly connected to the outer wall of the connecting piece 4. The limiting ring 23 and the limiting ring 47 can form a bidirectional limiting and blocking structure, which effectively restricts the excessive extension or misalignment of the docking structure and ensures the accurate docking and assembly position of the connecting sleeve 2 and the connecting piece 4.

[0028] It should be noted that all standard parts used in this application can be purchased from the market, and the specific connection methods of each part are all conventional methods such as riveting and welding that are mature in the prior art. In addition, the standard parts are all conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art.

[0029] Working Principle: In use, medical personnel first perform a puncture on the patient's diseased bile duct, inserting a guidewire into the bile duct. Using the guidewire, the entire cannula 1 is guided into the location of the biliary stricture, achieving precise positioning of the device. During the initial assembly stage, the connecting sleeve 2 and the connecting piece 4 are aligned. The sliding ring 41 is pushed to stretch the elastic telescopic rod 49, causing the hemispherical orifice 42 to avoid the protrusion 45. The connecting block 21 is inserted into the connecting piece 4 and presses against the protrusion 46, causing the connecting ring 44 to compress and displace the return spring. After the connecting block 21 is fully in place, the return spring rebounds, pushing the protrusion 46 into the hemispherical orifice 22, achieving initial locking and fixation. Then, the sliding ring 41 is released, and the elastic telescopic rod 49 retracts, causing the sliding ring 41 to return to its original position, blocking the protrusion 45 and locking the elastic connector position. Combined with the limiting rings 23 and 47, this ensures precise alignment and a secure connection between the connecting sleeve 2 and the connecting piece 4, making the cannula 1 and the drainage catheter 3 a single integrated structure.

[0030] After the device is in place and assembled, adjust the three-way valve 52 to open the air passage of connecting pipe 1 51 and close the air passage of connecting pipe 3 58. Repeatedly press the airbag 54; outside air enters the airbag 54 through the one-way air inlet 56. During pressing, gas is discharged from the one-way exhaust port 55 into connecting pipe 2 53, and then sent through the three-way valve 52 and connecting pipe 1 51 into the cavity 101 of the sleeve 1, causing the flexible elastic sleeve 1 to inflate and expand. The expansion diameter adapts to the degree of biliary stenosis in the patient, uniformly expanding and shaping the inner wall of the narrowed bile duct without the need for additional dilation instruments, simplifying the surgical procedure. During operation, the pressure sensor 57 monitors the internal air pressure in the air passage in real time, dynamically providing feedback on the expansion pressure of sleeve 1. This allows medical staff to control the expansion force, achieving stable and controllable expansion, avoiding damage to the bile duct mucosa due to excessive pressure or poor dilation effect due to insufficient pressure.

[0031] After completing the bile duct dilation and shaping, adjust the three-way valve 52 again to close the air passage of connecting tube 1 51 and open the air passage of connecting tube 3 58. Continuously press the airbag 54 to allow gas to enter the connecting groove 102 inside the sleeve 1 through connecting tube 3 58, and then be evenly delivered to the interior of each set of expansion sleeves 6 through the port 61 on the sleeve 1. This causes the multiple sets of arrayed expansion sleeves 6 to inflate and expand synchronously, providing multi-point contact and support to the inner wall of the bile duct, and stably fixing the entire sleeve 1 inside the bile duct. This effectively prevents the tubing from loosening, shifting, or slipping, and improves the stability of long-term placement.

[0032] After the device is fixed, the accumulated bile inside the bile duct flows into the internal channel through multiple drainage holes 31 on the surface of the drainage catheter 3, continuously completing the bile decompression and drainage operation, comprehensively covering the drainage area, and effectively avoiding drainage dead zones and tube blockage problems. At the same time, by pulling the pull wire 33 at the end of the drainage catheter 3, in conjunction with the limiting effect of the fixing piece 32, the end of the drainage catheter 3 can bend appropriately to fit the inner wall of the bile duct, further improving the stability of the tube fit and the drainage effect. During postoperative maintenance or tube replacement, the sliding ring 41 can be pushed again to unlock the elastic connector, quickly separating the sleeve 1 and the drainage catheter 3, realizing separate maintenance and replacement, reducing the risk of secondary injury to the patient, and adapting to the needs of minimally invasive treatment and long-term rehabilitation support for complex biliary strictures.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multifunctional biliary drainage tube for strictures, characterized in that, include: A sleeve (1) is fixedly connected to a connecting sleeve (2). A cavity (101) is opened in the sleeve (1), and the side wall of the sleeve (1) is made of a flexible elastic material. After the gas is filled into the cavity (101), the side wall of the sleeve (1) can expand. Drainage conduit (3), the drainage conduit (3) is sleeved by a sleeve (1), the drainage conduit (3) is provided with a drainage structure, the drainage conduit (3) is fixedly connected with a connector (4), the connector (4) and the connecting sleeve (2) are detachably connected through the connecting structure; The auxiliary fixing mechanism (5) includes a connecting pipe (51), a connecting component, an air supply component, and a pressure sensor (57). The connecting pipe (51) is fixedly connected to the sleeve (1), and both ends of the connecting pipe (51) are connected to the cavity (101) and the connecting component, respectively. The air supply component is installed on the connecting component, and the pressure sensor (57) is fixedly installed on the connecting component.

2. The multifunctional biliary drainage tube for strictures according to claim 1, characterized in that: The drainage structure consists of multiple sets of drainage holes (31) set on the drainage conduit (3) and the flow channel in the drainage conduit (3).

3. A multifunctional biliary drainage tube for strictures according to claim 1, characterized in that: A fixing piece (32) is fixedly connected to the drainage conduit (3). A pull wire (33) is fixedly connected to one end of the drainage conduit (3) away from the connector (4), and the pull wire (33) passes through the drainage conduit (3) and is connected to the fixing piece (32).

4. A multifunctional biliary drainage tube for strictures according to claim 1, characterized in that: Multiple sets of expansion sleeves (6) are arranged in an array on the sleeve (1). A connecting groove (102) is provided in the sleeve (1). The expansion sleeve (6) and the connecting groove (102) are connected through a port (61) opened on the sleeve (1).

5. A multifunctional biliary drainage tube for strictures according to claim 4, characterized in that: The connecting component includes a three-way valve (52) and a second connecting pipe (53). The three-way valve (52) is connected to a first connecting pipe (51), and the second connecting pipe (53) is connected to the three-way valve (52). The pressure sensor (57) is fixedly installed on the second connecting pipe (53).

6. A multifunctional biliary drainage tube for strictures according to claim 5, characterized in that: The air replenishment component consists of an airbag (54) and a one-way exhaust port (55) and a one-way air inlet (56) opened on the airbag (54). The one-way exhaust port (55) is connected to the end of the connecting pipe (53) away from the three-way valve (52).

7. A multifunctional biliary drainage tube for strictures according to claim 5, characterized in that: The three-way valve (52) is connected to a connecting pipe three (58), and the end of the connecting pipe three (58) away from the three-way valve (52) is connected to the connecting groove (102).

8. A multifunctional biliary drainage tube for strictures according to claim 1, characterized in that: The connection structure includes a docking block (21), a sliding ring (41), an elastic plug, a fixing ring (48), and an elastic telescopic rod (49). The docking block (21) is fixedly connected to one end of the connecting sleeve (2) near the connecting member (4). The docking block (21) has a hemispherical opening (22). The sliding ring (41) is slidably connected in the connecting member (4). The inner surface of the sliding ring (41) has a hemispherical opening (42). The connecting member (4) has an inner groove (43), and the elastic plug is disposed in the inner groove (43). The fixing ring (48) is fixedly connected to the outer wall of the connecting member (4). The elastic telescopic rod (49) is fixedly installed on the fixing ring (48), and the telescopic end of the elastic telescopic rod (49) is fixedly connected to the sliding ring (41).

9. A multifunctional biliary drainage tube for strictures according to claim 8, characterized in that: The elastic connector consists of a connecting ring (44), a protruding rod (45), a protrusion (46), and a return spring. The connecting ring (44) and the inner groove (43) are elastically connected by the return spring. The connecting ring (44) is slidably connected in the inner groove (43). The protruding rod (45) and the protrusion (46) are respectively fixedly connected to both sides of the connecting ring (44). The first hemispherical opening (22) matches the protrusion (46), and the second hemispherical opening (42) matches the protruding rod (45).

10. A multifunctional biliary drainage tube for strictures according to claim 8, characterized in that: Limiting ring one (23) is fixedly connected to the outer wall of the connecting sleeve (2), and limiting ring two (47) is fixedly connected to the outer wall of the connecting piece (4).

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