Biliary tract drainage device

Abstract

The utility model relates to a biliary tract drainage device which comprises a drainage tube, a catheter seat and a locking connector. The drainage tube comprises a tube body section and a pigtail section extending at the far end of the tube body section, the tube body section is provided with a central cavity and a plurality of peripheral cavities which extend in the length direction, and the pigtail section is provided with an inner cavity communicated with the central cavity. The near end of the catheter body section is fixedly connected with the catheter base, and the catheter base is detachably connected with the locking connector. A plurality of first drainage holes are formed in the side wall of the pigtail section, the first drainage holes are communicated with an inner cavity of the pigtail section, and when the pigtail section forms a pigtail ring, the first drainage holes are located in the inner side of the pigtail ring. A second drainage hole is formed in the side wall of the far side of the catheter body section and communicated with the central cavity. The locking connector is provided with an inner cavity extending in the length direction, and when the locking connector and the catheter base are in the assembled connection state, the inner cavity of the locking connector is at least communicated with the center cavity. According to the biliary tract drainage device, the size of the catheter connector can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to a biliary drainage device. Background Art

[0002] Bile is secreted by liver cells and flows into the duodenum through the hepatic duct and common bile duct; or it flows into the gallbladder through the hepatic duct and cystic duct for storage, and then is discharged from the gallbladder into the duodenum when digestion is needed. An adult secretes 800 - 1000 milliliters of bile per day. The main function of bile is to emulsify fat into tiny droplets for easy digestion, and it can also promote the absorption of fatty acids and fat-soluble vitamins. It is an important part of the digestive system. When bile is stagnated due to extrahepatic tumors, stones, inflammation, etc., it will cause an increase in the pressure within the biliary tract. Bile flows back from liver cells and bile capillaries into blood sinusoids and perisinusoidal spaces, causing an increase in the level of conjugated bilirubin in the blood and resulting in jaundice. In severe cases, it can cause liver cirrhosis, liver failure, and even death. Clinically, placing a drainage tube is usually chosen as a means to drain bile and relieve symptoms.

[0003] The biliary drainage tube is a medical device commonly used in clinical practice to drain bile. According to the "Expert Consensus on the Nursing of Percutaneous Transhepatic Biliary Drainage Tubes", (1) after the patient is implanted with a biliary drainage tube, it is recommended to perform routine flushing once a day; (2) the normal pressure within the intrahepatic bile duct < 30 cmH2O, and the extrahepatic bile duct pressure < 15 cmH2O. Therefore, the flushing and aspiration pressure should not exceed 30 cmH2O, otherwise it may cause bile to flow back into the blood and lead to bleeding. Currently, most of the drainage holes on the market are in the same direction, and the outlet of the flushing cavity is the drainage hole. So the flushing holes are generally in a single direction and cannot completely flush all parts of the biliary tract. Therefore, a biliary drainage device that can limit the flushing speed, has selectable flushing directions, and can expand other functions is needed. Content of the Utility Model

[0004] In view of the above technical problems, the utility model provides a biliary drainage device.

[0005] A biliary drainage device includes a drainage tube, a catheter seat, and a locking joint. The drainage tube includes a tube body section and a pigtail section extending distally from the tube body section. The tube body section has a central cavity extending in the length direction and a plurality of peripheral cavities. The pigtail section is provided with an inner cavity extending in the length direction and communicating with the central cavity. The proximal end of the tube body section is fixedly connected to the catheter seat, and the catheter seat is detachably connected to the locking joint. The side wall of the pigtail section is provided with a plurality of first drainage holes, and the first drainage holes communicate with the inner cavity of the pigtail section. When the pigtail section forms a pigtail loop, the first drainage holes are located inside the pigtail loop. The side wall of the distal part of the tube body section is provided with second drainage holes in multiple directions, and the second drainage holes communicate with the central cavity. The locking joint has an inner cavity extending in the length direction. When the locking joint is in an assembled connection state with the catheter seat, the inner cavity of the locking joint is at least connected to the central cavity.

[0006] Furthermore, the catheter seat has a first hollow connecting portion and a second hollow connecting portion that extend longitudinally. The first hollow connecting portion communicates with the second hollow connecting portion. The distal end of the first hollow connecting portion is the distal end of the catheter seat, and the proximal end of the second hollow connecting portion is the proximal end of the catheter seat. The inner diameter of the second hollow connecting portion is greater than the outer diameter of the proximal segment of the first hollow connecting portion. The proximal segment of the first hollow connecting portion is nested in the distal segment of the second hollow connecting portion, and the proximal end of the first hollow connecting portion does not reach within the proximal segment of the second hollow connecting portion. The second hollow connecting portion is adapted to receive the distal segment of the locking joint, and the inner cavity of the locking joint is adapted to receive at least a portion of the proximal segment of the first hollow connecting portion. The distal segment of the second hollow connecting portion is provided with an internal thread, and the distal end of the locking joint is provided with an external thread; when the catheter seat and the locking joint are in an assembled and connected state, the internal thread of the second hollow connecting portion and the external thread of the locking joint are screwed together.

[0007] Furthermore, the biliary drainage device further includes an annular seal. The outer periphery of the locking joint is provided with an annular groove, and the annular seal is placed in the annular groove. When the locking joint and the catheter seat are in an assembled and connected state, both the annular groove and the annular seal are partially located in the proximal segment of the second hollow connecting portion, and the annular seal is pushed in the direction from the distal end to the proximal end and radially inwardly by the catheter seat. Preferably, the inner diameter of the proximal segment of the second hollow connecting portion gradually increases from the distal end to the proximal end.

[0008] Furthermore, the biliary drainage device further includes a traction wire and a buckle. The buckle is located outside the catheter seat, and one end of the traction wire is fixed to the buckle. The annular seal has a first wire-passing hole, and the locking joint is provided with a second wire-passing hole at the annular groove. The first wire-passing hole and the second wire-passing hole are close to each other; the proximal side of the pigtail segment is provided with a third wire-passing hole communicating with the inner cavity of the pigtail segment, and the distal side of the pigtail segment is provided with a fourth wire-passing hole communicating with the inner cavity of the pigtail segment. The other end of the traction wire passes through the first wire-passing hole and the second wire-passing hole, extends in the central cavity, then passes out through the third wire-passing hole, further passes through the fourth wire-passing hole, then extends through the central cavity again, passes out through the second wire-passing hole and the first wire-passing hole, and is fixed to the buckle; or, the other end of the traction wire passes through the first wire-passing hole and the second wire-passing hole, extends in the central cavity, then passes out through the fourth wire-passing hole, further passes through the third wire-passing hole, then extends through the central cavity again, passes out through the second wire-passing hole and the first wire-passing hole, and is fixed to the buckle.

[0009] Preferably, the cross-section of the central cavity has convex contours and concave contours in multiple directions, and the convex contours and the concave contours are alternately arranged circumferentially. An outer peripheral cavity is provided on the outer side of each concave contour in each direction.

[0010] Further, the side wall on the distal side of the pipe body section is also provided with multi-functional holes in multiple directions. The second drainage holes in each direction are communicated with the central cavity through the convex contour in the corresponding direction, and the multi-functional holes in each direction are communicated with one peripheral cavity in the corresponding direction.

[0011] Further, the biliary drainage device further includes an additional function component. The additional function component includes an introducer and a syringe, and the introducer and the syringe are operably fluidly connected. The introducer includes an introduction seat and an introduction tube. The introduction seat has a longitudinally extending inner cavity, and the introduction tube is fixedly connected to the distal end of the introduction seat. The inner cavity of the introduction seat is communicated with the introduction tube. When the locking joint and the catheter seat are in a disassembled and disconnected state, the introduction tube can be connected to the peripheral cavity, and the additional function component is configured to be suitable for introducing a medical medium or a drug into at least one peripheral cavity. Preferably, the introduction tube and the peripheral cavity are in interference fit.

[0012] Further, the biliary drainage device further includes a Luer plug or a drainage bag, and the proximal end of the locking joint is configured as a Luer joint; when the locking joint and the catheter seat are in an assembled and connected state, the proximal end of the locking joint is connected to the Luer plug or the drainage bag.

[0013] Compared with the conventional multi-head (Y-shaped, bifurcated) design, the biliary drainage device provided by the present utility model has a detachable sealing joint, and its structural manner can reduce the size of the catheter joint. First, a smaller joint can make the pulling force borne by the pigtail smaller, reducing the risk of the drainage tube slipping out of the body due to the overweight of the joint. Second, during the indwelling process of the drainage tube in the human body, the joint is generally attached to the patient's skin by means such as tape, and a smaller joint will make the patient more comfortable. In addition, a central cavity and multiple peripheral cavities are arranged on the pipe body section, which can not only be used for drainage, but also can be used for flushing or administering drugs in a specific direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 Shows a schematic composition diagram of a biliary drainage device of the present utility model;

[0016] Figure 2A Shows a schematic diagram of the arrangement of holes in the pipe body section and the pigtail section in one direction, where the position of the third wire threading hole is shown;

[0017] Figure 2B Shows a schematic diagram of the arrangement of holes in the pigtail section in another direction, where the position of the fourth wire threading hole is shown;

[0018] Figure 2C Shows a longitudinal sectional schematic diagram passing through two wire threading holes in the pigtail section;

[0019] Figure 3A Shows a transverse sectional schematic diagram of the proximal side of the pipe body section;

[0020] Figure 3B Shows a transverse sectional schematic diagram at one of the second drainage holes in the pipe body section;

[0021] Figure 3C Shows a transverse sectional schematic diagram at one of the multi-functional holes in the pipe body section;

[0022] Figure 3D Shows a transverse sectional schematic diagram at the third wire threading hole of the pigtail section;

[0023] Figure 4A Shows a three-dimensional schematic diagram of the detachable sealing assembly provided by the present utility model in an assembled and connected state;

[0024] Figure 4B Shows a longitudinal sectional schematic diagram of the detachable sealing assembly provided by the present utility model in a connected state;

[0025] Figure 4C Shows a longitudinal sectional schematic diagram of the catheter seat;

[0026] Figure 4D Shows a three-dimensional view of the locking joint;

[0027] Figure 5 Shows a schematic diagram when the introducer is connected to the peripheral cavity after the locking joint is disassembled;

[0028] Figure 6 Shows a schematic diagram when the syringe injects a medical medium into the peripheral cavity through the introducer after the locking joint is disassembled.

[0029] Explanation of reference numerals:

[0030] 1000 - Biliary drainage device, 200 - Detachable sealing assembly, 300 - Drainage tube, 400 - Additional function assembly;

[0031] 10 - Catheter seat, 12 - Internal thread, 131 - First hollow connection part, 132 - Second hollow connection part, 133 - Proximal section, 14 - Annular seal, 15 - First wire threading hole;

[0032] 20 - Locking joint, 22 - External thread, 24 - Annular groove, 25 - Connection section, 26 - Flow through section, 27 - Gap, 28 - Second wire threading hole;

[0033] 30 - Tube body section, 32 - Central cavity, 32a - Convex contour, 32b - Concave contour, 34 - Peripheral cavity, 36 - Second drainage hole, 38 - Multi-functional hole;

[0034] 40 - Pigtail section, 44 - Third threading hole, 46 - First drainage hole, 48 - Fourth threading hole;

[0035] 52 - Traction wire, 54 - Snap fastener;

[0036] 60 - Introducer, 62 - Introduction seat, 64 - Introduction tube;

[0037] 70 - Syringe. Detailed implementation mode

[0038] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

[0039] For the purpose of this patent application, the term "distal end" refers to the end of the device farthest from the operator, and the term "distal segment" refers to a segment closer to the distal end that is longer than the distal end. The term "proximal end" refers to the end of the device close to the operator, in the direction towards the access site where the device is introduced into the body, and the term "proximal segment" refers to a segment closer to the proximal end that is longer than the proximal end. The term "cross-section" refers to a cut along the width direction or radial direction of the device, and the term "longitudinal section" refers to a cut along the length direction or axial direction of the device.

[0040] Refer to Figure 1 、 Figures 2A to 2C For this utility model, a detachable sealing assembly 200 and a biliary drainage device 1000 are provided. The biliary drainage device 1000 can provide multiple functions such as drainage, irrigation, drug carrying, and drug infusion. When the biliary drainage device 1000 is used for drainage, the detachable sealing assembly 200 is in an assembled and connected state; when the biliary drainage device 1000 is used for other functions other than drainage, the detachable sealing assembly 200 is in a disassembled and non-connected state.

[0041] Specifically, the biliary drainage device 1000 includes a drainage tube 300, a detachable sealing assembly 200, an optional traction wire 52 and a buckle 54, and an optional additional function assembly 400. The buckle 54 is disposed outside the detachable sealing assembly 200. The traction wire 52 and the buckle 54 are used to shape and fix the pigtail section at the distal side of the drainage tube 300 into a pigtail loop. The traction wire 52 enters the drainage tube 300 from the detachable sealing assembly 200 and then folds back to the buckle 54 for fixation (detailed introduction later). The additional function assembly 400 establishes a connection with the drainage tube 300 after some parts of the detachable sealing assembly 200 are disassembled, and is used to assist in completing functions such as flushing, drug carrying, or drug infusion. Exemplarily, the additional function assembly 400 includes an introducer 60 and a syringe 70, which are used to assist in completing the functions of flushing or drug infusion.

[0042] See Figure 1 , Figure 4A and Figure 4B , the detachable sealing assembly 200 includes a catheter seat 10, an annular seal 14, and a locking joint 20. The catheter seat 10 is fixedly connected to the proximal end of the drainage tube 300 in its distal direction. The catheter seat 10 is detachably and sealingly connected to the locking joint 20 in its proximal direction. The annular seal 14 is disposed at the joint between the catheter seat 10 and the locking joint 20. The traction wire 52 can enter the drainage tube 300 from the position where the annular seal 14 is located, fold back, and then return to the buckle 54 from the same position. By providing the annular seal 14, fluid leakage at the connection between the catheter seat 10 and the locking joint 20 can be avoided.

[0043] In some embodiments, the proximal end of the locking joint 20 is configured as a standard - sized Luer connector. When the biliary drainage device 1000 is used for drainage, the detachable sealing assembly 200 is in an assembled and connected state, and the proximal end of the locking joint 20 can be connected to a Luer plug or a drainage bag. When the biliary drainage device 1000 is used for other functions other than drainage, the detachable sealing assembly 200 is in a disassembled and non - connected state, that is, the locking joint 20 is not connected to the proximal end of the catheter seat 10. At this time, the additional function assembly 400 can be connected to the proximal end of the catheter seat 10 and the drainage tube 300 to complete functions such as flushing, drug carrying, or drug infusion.

[0044] Refer to together Figure 1 , Figure 2A , Figures 3A to 3D, the drainage tube 300 includes a tube body section 30 and a pigtail section 40, and the pigtail section 40 extends continuously from the distal end of the tube body section 30. The tube body section 30 has a central cavity 32 extending in the longitudinal direction and a plurality of peripheral cavities 34. The cross-section of the central cavity 32 has convex contours 32a in multiple directions and concave contours 32b in multiple directions, and the convex contours 32a and the concave contours 32b are circumferentially arranged alternately. A peripheral cavity 34 is provided outside the concave contour 32b in each direction. Exemplarily, referring to Figures 3A to 3C , the central cavity 32 has four convex contours 32a and four concave contours 32b; there are a total of four peripheral cavities 34, and a peripheral cavity 34 with a circular cross-section is provided outside the concave contour 32b in each direction. The pigtail section 40 has an inner cavity extending in the longitudinal direction, and the inner cavity of the pigtail section 40 communicates with the central cavity 32 of the tube body section 30.

[0045] A second drainage hole 36 communicating with the central cavity 32 is provided at the distal side of the tube body section 30. More specifically, a plurality of second drainage holes 36 are provided in each direction of the tube body section 30, and a plurality of second drainage holes 36 in each direction form a group, and each group of second drainage holes 36 is arranged along the longitudinal direction of the tube body section. By providing second drainage holes in multiple directions, the situation of blockage of the holes caused by the tube body section fitting against the human body can be prevented. Referring to Figure 3B , each group of second drainage holes 36 is arranged in one direction, and each group of second drainage holes 36 communicates with the central cavity 32 through the convex contour 32a in this direction. In some embodiments, the distal end of the peripheral cavity 34 is closed, and the peripheral cavity 34 can be used to fill and carry drugs. In other embodiments, a multi-functional hole 38 communicating with the peripheral cavity 34 is further provided at the distal side of the tube body section 30, and the multi-functional holes 38 are arranged around the tube body section in multiple directions, and each multi-functional hole 38 communicates with a peripheral cavity 34 respectively. Referring to Figure 3C , the multi-functional hole 38 in each direction communicates with the corresponding peripheral cavity 34 in this direction. Since the central cavity 32 is configured to have convex contours 32a and concave contours 32b that are circumferentially arranged alternately, the second drainage holes 36 and the multi-functional holes 38 can be arranged staggeredly in multiple directions of the tube body section 30, so that not only can the drainage volume that meets the clinical requirements be ensured, but also flushing or drug administration can be performed in a specific direction.

[0046] The pigtail segment 40 is provided with a plurality of (for example, four) first drainage holes 46 arranged in the length direction. When the pigtail segment 40 is formed into a pigtail ring, the four first drainage holes 46 are located on the inner side of the pigtail ring, which is conducive to preventing the tube body of the pigtail segment 40 from fitting the human body and causing the hole to be blocked. In some embodiments, the pigtail segment 40 can be self-shaped into a pigtail ring based on a specific material. In other embodiments, the pigtail segment 40 can be shaped into a pigtail ring under the constraint of a traction line. According to the biliary drainage device 1000 provided by the utility model, when used for internal drainage, the central cavity 32 provides a drainage channel, and when used for external drainage, the central cavity 32 and the peripheral cavity 34 are used together as a drainage channel to increase the drainage amount. Among them, when the peripheral cavity 34 is used as a drainage channel, bile enters the peripheral cavity 34 from the multifunctional hole 38, merges with the bile flowing in from the second drainage hole 36 at the proximal end of the tube body, and flows out from the inner cavity of the locking joint 20 together. That is, when the biliary drainage device 1000 is used for external drainage, the multifunctional hole 38 can be used for auxiliary drainage, as an expanded second drainage hole 36, to increase the drainage amount of the device.

[0047] See also Figure 1 , Figures 2A to 2C , Figures 4A to 4D The utility model shapes and fixes the pigtail section 40 through the traction line 52 and the lock buckle 54. Figure 2B Is Figure 2A A partial schematic diagram after counterclockwise rotation looking toward the far end; Figure 2C yes Figure 2A The partial schematic diagram after the longitudinal section through the third threading hole 44 after rotating 180° counterclockwise toward the far end, at this time, the first drainage hole 46 is located on the inner side of the paper. For the convenience of display, Figure 4B The drainage tube 300 connected to the distal end of the catheter adapter 10 is omitted.

[0048] refer to Figures 4B to 4D The catheter seat 10 and the locking connector 20 are detachably connected by threads, and an annular groove 24 is provided on the circumference of the locking connector 20, and the annular seal 14 is sleeved in the annular groove 24. A first threading hole 15 can be formed on the annular seal 14 by puncture, and a second threading hole 28 is provided on the annular groove 24. When the locking connector 20 and the catheter seat 10 are in an assembled connection state, the first threading hole 15 and the second threading hole 28 are adjacent to each other.

[0049] refer to Figures 2A to 2C , Figure 3D, a third wire threading hole 44 communicating with the inner cavity of the pigtail section 40 is arranged proximally to the pigtail section 40, and a fourth wire threading hole 48 communicating with the inner cavity of the pigtail section 40 is arranged distally to the pigtail section 40. The first drainage holes 46 are arranged longitudinally between the third wire threading hole 44 and the fourth wire threading hole 48. The four first drainage holes 46 are arranged in the same direction, the arrangement directions of the third wire threading hole 44 and the fourth wire threading hole 48 are different from the arrangement direction of the first drainage holes 46, and moreover, the arrangement directions of the third wire threading hole 44 and the fourth wire threading hole 48 are opposite to each other.

[0050] In some embodiments, one end of the traction wire 52 is fixed to the buckle 54, and the other end of the traction wire 52 sequentially passes through the first wire threading hole 15 of the annular seal 14 and the second wire threading hole 28 on the annular groove 24; then, the traction wire 52 enters the central cavity 32 of the pipe body section 30, and the traction wire 52 extends from the central cavity 32 all the way to the inner cavity of the pigtail section 40; then, the traction wire 52 passes out of the drainage tube 300 from the third wire threading hole 44 and then enters the inner cavity of the pigtail section 40 from the fourth wire threading hole 48 and starts to turn back; finally, the other end of the traction wire 52 leaves the detachable seal assembly 200 from the second wire threading hole 28 and the first wire threading hole 15 and returns to the fixed end and is fixed to the buckle 54 together with it. In this implementation manner, the threading sequence of the other end of the traction wire 52 can be summarized as: entering from the first wire threading hole, entering from the second wire threading hole, exiting from the third wire threading hole, entering from the fourth wire threading hole, exiting from the second wire threading hole, and exiting from the first wire threading hole. Alternatively, the threading sequence of the other end of the traction wire 52 can also be in the order of entering from the first wire threading hole, entering from the second wire threading hole, exiting from the fourth wire threading hole, entering from the third wire threading hole, exiting from the second wire threading hole, and exiting from the first wire threading hole.

[0051] Reference Figures 4A to 4D , the detachable seal assembly 200 provided by the present utility model will be further introduced in detail below.

[0052] The catheter seat 10 has a first hollow connecting portion 131 and a second hollow connecting portion 132 extending longitudinally. The first hollow connecting portion 131 communicates with the second hollow connecting portion 132. The distal end of the first hollow connecting portion 131 is the distal end of the catheter seat 10, and the proximal end of the second hollow connecting portion 132 is the proximal end of the catheter seat 10. The inner diameter of the second hollow connecting portion 132 is greater than the outer diameter of the proximal section of the first hollow connecting portion 131, and the proximal section of the first hollow connecting portion 131 is nested in the distal section of the second hollow connecting portion 132. The first hollow connecting portion 131 is adapted to receive the proximal end of the drainage tube 300 to fixedly connect the drainage tube 300 to the catheter seat 10, and the second hollow connecting portion 132 is adapted to receive the distal section of the locking joint 20 and at least fluidly connect the central cavity 32 of the drainage tube 300 with the inner cavity of the locking joint 20.

[0053] Reference Figure 4B and Figure 4D, the locking joint 20 has a longitudinally extending inner cavity. The inner cavity of the locking joint 20 includes a distal connecting section 25 and a flow-through section 26 that continues from the proximal end of the connecting section 25. The radial dimension of the connecting section 25 is greater than the radial dimension of the flow-through section 26. The radial dimension of the connecting section 25 is greater than the outer diameter of the proximal section of the first hollow connecting portion 131, and the radial dimension of the flow-through section 26 can be less than or equal to the inner diameter of the proximal section of the first hollow connecting portion 131. Alternatively, the radial dimension of the flow-through section 26 is made less than or equal to the inner diameter of the proximal section of the first hollow connecting portion 131 only at the portion where it abuts the proximal end of the first hollow connecting portion 131, and the radial dimension of the other portions of the flow-through section 26 is not limited. When the locking joint 20 is received by the second hollow connecting portion 132, the connecting section 25 of the inner cavity of the locking joint 20 can receive the proximal end of the first hollow connecting portion 131. More specifically, the connecting section 25 can receive at least a portion of the proximal section of the first hollow connecting portion 131. When the length of the connecting section 25 is comparable to the length of the proximal section of the first hollow connecting portion 131, the connecting section 25 can receive the entire proximal section of the first hollow connecting portion 131. The flow-through section 26 of the inner cavity of the locking joint 20 can be at least in communication with the central cavity 32 of the drainage tube 300. When the peripheral cavity 34 and the multi-functional hole 38 are used for auxiliary drainage, the flow-through section 26 of the inner cavity of the locking joint 20 can be in communication with both the central cavity 32 and the peripheral cavity 34 of the drainage tube 300 simultaneously.

[0054] More specifically, an inner thread 12 is provided on the distal section of the second hollow connecting portion 132 of the catheter seat 10, and an external thread 22 matching the inner thread 12 is provided at the distal end of the locking joint 20. After the locking joint 22 is received in the second hollow connecting portion 132, the two can be detachably connected by threading. Further, the inner diameter of the proximal section 133 of the second hollow connecting portion 132 gradually increases from the distal end to the proximal end, and the proximal end of the first hollow connecting portion 131 does not reach within the proximal section 133 of the second hollow connecting portion 132. An annular groove 24 is provided on the outer periphery of the locking joint 20, and the annular groove 24 is used to provide a placement space for the annular seal 14. The annular seal 14 is compressed by the combined extrusion of the second hollow connecting portion 132 and the annular groove 24, thereby providing a seal for the detachable seal assembly 200. And the second wire threading hole 28 is provided in the annular groove 24, so that the annular groove 24 can also provide a seal for the traction wire 52 to prevent fluid leakage. When the catheter seat 10 and the locking joint 20 are in an assembled and connected state, both the annular groove 24 and the annular seal 14 are partially located in the proximal section 133 of the second hollow connecting portion 132. Since the inner wall of the proximal section 133 of the catheter seat 10 is a structure that gradually contracts inward (from the proximal end to the distal end), the minimum inner diameter of the proximal section 133 of the catheter seat 10 is smaller than the outer diameter of the annular seal 14 in the natural state. After the locking joint 20 is connected to the catheter seat 10, the gap between the annular seal 14 and the inner wall of the catheter seat 10 is completely filled, and the annular seal 14 is in a state of being extruded (radially inward and axially from the distal end to the proximal end).

[0055] Specifically, the outer diameter of the portion of the locking joint 20 that is distally adjacent to the annular groove 24 is smaller than the outer diameter of the portion of the locking joint 20 that is proximally adjacent to the annular groove 24. The smaller outer diameter of the distally adjacent portion of the locking joint 20 forms an appropriate gap 27 between this portion and the inner wall of the second hollow connecting portion 132; the slightly larger outer diameter of the proximally adjacent portion of the locking joint 20 is beneficial for providing support to the annular seal 14 when it is being extruded (especially axially from the distal end to the proximal end).

[0056] The annular seal 14 provided by the present utility model is elastic. For example, it can be a conventional silicone rubber sealing ring. The catheter seat 10, the locking joint 20, and the annular seal 14 only need to jointly achieve detachable, sealed, and fluid communication between the locking joint and the central cavity (or the central cavity and the peripheral cavity).

[0057] Compared with the conventional multi-head (Y-shaped, bifurcated) design, the detachable seal assembly provided by the present utility model can reduce the size of the catheter joint. First, a smaller joint can make the pulling force borne by the pigtail smaller, reducing the risk of the drainage tube slipping out of the body due to the excessive weight of the joint. Second, during the indwelling process of the drainage tube in the human body, the joint is generally attached to the patient's skin by means such as tape. A smaller joint will make the patient more comfortable.

[0058] Reference Figure 5 and Figure 6 , by way of example, the additional function component 400 provided by the present utility model includes an introducer 60 and a syringe 70, which can be used to inject a flushing solution or an anti-inflammatory drug into the peripheral cavity 34 in the drainage tube 300. The introducer 60 includes an introduction tube 64 and an introduction seat 62. The introduction seat 62 is located at the proximal end of the introduction tube 64. The introduction seat 62 has a longitudinally extending inner cavity, and the inner cavity of the introduction seat 62 is in communication with the introduction tube 64. The introducer 60 and the syringe 70 are operably fluidly connected. The specific construction method of the proximal end of the introduction seat 62 and the distal end of the syringe 70 is not limited, as long as the two can be adapted to each other and connected so that the medical medium in the syringe 70 can be injected into the inner cavity of the introduction seat 62. When using the additional function component 400, the locking joint 20 of the detachable sealing component 200 is removed from the catheter seat 10, the peripheral cavity 34 in the target direction can be selected from the proximal opening of the catheter seat 10, and the introduction tube 64 is inserted into the peripheral cavity 34 in the target direction. Preferably, the outer diameter of the introduction tube 64 is larger than the inner diameter of the peripheral cavity 34. After the introduction tube 64 enters the peripheral cavity 34, the two are in interference fit.

[0059] Those skilled in the art can understand that the specific implementation manner of the additional function component 400 is not limited to the introducer 60 and the syringe 70 provided by the present utility model. Based on the drainage tube 300 and the detachable sealing component 200 provided by the present utility model, when a single peripheral cavity 34 in the drainage tube 300 is used for different functions, the additional function component 400 corresponding to the function can be configured accordingly. Or, when the peripheral cavities 34 in the drainage tube 300 are used for different function combinations, the additional function component corresponding to the combined function can be configured accordingly. However, no matter which additional function component it is, it needs to be configured with a pipe structure connected to the peripheral cavity 34, such as the introduction tube 64 of the introducer 60, as the connection channel between the peripheral cavity 34 and the additional function component 34.

[0060] The above are only several embodiments of the present disclosure. Those skilled in the art can make various changes or modifications to the embodiments of the present disclosure without departing from the spirit and scope of the present disclosure according to the content disclosed in the application documents.

Claims

1. A biliary drainage device, characterized in that, It includes a drainage tube, a catheter seat and a locking joint; The drainage tube includes a tube body section and a pigtail section extending distally from the tube body section. The tube body section has a central cavity extending in the length direction and a plurality of peripheral cavities. The pigtail section is provided with an inner cavity extending in the length direction and communicating with the central cavity. The proximal end of the tube body section is fixedly connected to the catheter seat, and the catheter seat is detachably connected to the locking joint; The side wall of the pigtail section is provided with a plurality of first drainage holes, and the first drainage holes communicate with the inner cavity of the pigtail section. When the pigtail section forms a pigtail loop, the first drainage holes are located inside the pigtail loop; the side wall of the distal side of the tube body section is provided with a plurality of second drainage holes in various directions, and the second drainage holes communicate with the central cavity; The locking joint has an inner cavity extending in the length direction. When the locking joint is in an assembled connection state with the catheter seat, the inner cavity of the locking joint is at least in communication with the central cavity.

2. The biliary drainage device according to claim 1, characterized in that The catheter seat has a first hollow connecting portion and a second hollow connecting portion extending longitudinally. The first hollow connecting portion communicates with the second hollow connecting portion. The distal end of the first hollow connecting portion is the distal end of the catheter seat, and the proximal end of the second hollow connecting portion is the proximal end of the catheter seat; The inner diameter of the second hollow connecting portion is greater than the outer diameter of the proximal segment of the first hollow connecting portion. The proximal segment of the first hollow connecting portion is nested in the distal segment of the second hollow connecting portion, and the proximal end of the first hollow connecting portion does not reach within the proximal segment of the second hollow connecting portion; The second hollow connecting portion is adapted to receive the distal segment of the locking joint, and the inner cavity of the locking joint is adapted to receive at least a part of the proximal segment of the first hollow connecting portion; Internal threads are provided in the distal segment of the second hollow connecting portion, and external threads are provided at the distal end of the locking joint; when the catheter seat and the locking joint are in an assembled connection state, the internal threads of the second hollow connecting portion and the external threads of the locking joint are screwed together.

3. The biliary drainage device according to claim 2, wherein It further includes an annular seal; An annular groove is provided on the outer periphery of the locking joint, and the annular seal is placed in the annular groove; When the locking joint is in an assembled connection state with the catheter seat, both the annular groove and the annular seal are partially located in the proximal segment of the second hollow connecting portion, and the annular seal is pushed from the distal to the proximal direction and radially inwardly extruded by the catheter seat.

4. The biliary drainage device according to claim 3, wherein, The inner diameter of the proximal segment of the second hollow connecting portion gradually increases from the distal to the proximal.

5. The biliary drainage device according to claim 3, characterized in that, It further includes a traction wire and a buckle. The buckle is located outside the catheter seat, and one end of the traction wire is fixed to the buckle; The annular seal has a first wire threading hole, and the locking joint is provided with a second wire threading hole at the annular groove. The first wire threading hole and the second wire threading hole are close to each other; a third wire threading hole communicating with the inner cavity of the pigtail section is provided on the proximal side of the pigtail section, and a fourth wire threading hole communicating with the inner cavity of the pigtail section is provided on the distal side of the pigtail section; The other end of the traction wire passes through the first wire-passing hole and the second wire-passing hole, extends in the central cavity, passes out through the third wire-passing hole, further passes through the fourth wire-passing hole, extends through the central cavity again, and then passes out through the second wire-passing hole and the first wire-passing hole and is fixed to the buckle; alternatively, the other end of the traction wire passes through the first wire-passing hole and the second wire-passing hole, extends in the central cavity, passes out through the fourth wire-passing hole, further passes through the third wire-passing hole, extends through the central cavity again, and then passes out through the second wire-passing hole and the first wire-passing hole and is fixed to the buckle.

6. The biliary drainage device according to claim 1, characterized in that, The cross-section of the central cavity has convex contours and concave contours in multiple directions, and the convex contours and concave contours are alternately arranged circumferentially. One of the peripheral cavities is provided outside the concave contour in each direction.

7. The biliary drainage device according to claim 6, characterized in that, The side wall on the distal side of the pipe body section is further provided with multi-directional multi-functional holes. Each second drainage hole in each direction is connected to the central cavity through the convex contour in the corresponding direction, and each multi-functional hole in each direction is connected to one of the peripheral cavities in the corresponding direction.

8. The biliary drainage device according to claim 7, wherein, It further includes an additional function component; The additional function component includes an introducer and a syringe, and the introducer and the syringe are operably fluidly connected; The introducer includes an introduction seat and an introduction tube. The introduction seat has a longitudinally extending inner cavity, and the introduction tube is fixedly connected to the distal end of the introduction seat. The inner cavity of the introduction seat is connected to the introduction tube. When the locking joint and the catheter seat are in a disassembled and non-connected state, the introduction tube can be connected to the peripheral cavity, and the additional function component is configured to be suitable for introducing a medical medium or a drug into at least one peripheral cavity.

9. The biliary drainage device according to claim 8, wherein The introduction tube is in interference fit with the peripheral cavity.

10. The biliary drainage device according to claim 1, characterized in that, It further includes a Luer plug or a drainage bag. The proximal end of the locking joint is configured as a Luer joint; when the locking joint and the catheter seat are in an assembled and connected state, the proximal end of the locking joint is connected to the Luer plug or the drainage bag.

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