Biliary tract stent and nasal bile duct flushing and drainage device
By designing a controllable autodissolved bile stent and a nasal and bile duct flushing and drainage device, the problem of difficulty in removing the bile stent and nasal and bile duct combination is solved, and the bile duct unblocking and stability of bile drainage is achieved, reducing the incidence of inflammation and prolonging the median survival time.
Patent Information
- Application Number
- CN202421807317.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-08-08
- Estimated Expiration
- 2034-07-29
AI Technical Summary
In the prior art, the placement of bile duct stents alone may lead to bile viscousness, formation of bile ducts and obstruction, and the placement of nasochotomy ducts alone may lead to congestion of the ducts. The removal of the nasochotomy stent and nasochotomy ducts may lead to removal of the bile duct stent when placing bile ducts at the same time may lead to removal of the bile duct stent, increasing medical expenses and patient pain.
A biliary stent and nasal bile duct flushing and drainage device are designed, and the controllable self-dissolving material is connected, including the first branch, the second branch and the pipeline connection. The dissolved material is used to disintegrate in the eutectic gallium indium liquid metal to ensure that the removal of the nasal bile duct does not affect the stability of the bile stent.
The biliary duct unblocking and bile drainage stability are achieved, the problems of difficulty in removing and reobstructing of traditional stents are avoided, and the incidence of postoperative inflammation and median survival time are reduced.
Smart Images
Figure CN223196203U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, and in particular to a biliary stent and a nasobiliary duct flushing and drainage device, a preparation method and a use method thereof. Background Art
[0002] Placing a bile duct stent or nasobiliary stent in the bile duct can relieve bile duct stenosis or blockage caused by tumor infiltration, stone obstruction, acute cholangitis, etc., drain bile in time, and prevent jaundice, acute worsening of infection, secondary infectious shock, and even death.
[0003] For patients with prolonged cholestatic jaundice caused by various etiologies, placement of a biliary stent alone may cause bile viscosity and bile thrombosis, leading to stent obstruction. Placement of a nasobiliary duct alone can better drain bile and flush the bile duct, making it less likely for the duct to become blocked. However, after the condition improves, another biliary stent may need to be placed, increasing medical expenses and worsening the patient's pain. Placing a biliary stent and a nasobiliary duct together can solve the problems of bile duct patency and bile obstruction, but there is a risk of removing the biliary stent when removing the nasobiliary duct, and there are the following disadvantages:
[0004] 1. Traditional metal stents, commonly made of nickel-titanium alloy biliary stents, are non-cytotoxic, biocompatible, corrosion-resistant, and superelastic. In addition to possessing unique memory properties, nickel-titanium alloy biliary stents contract at martensite temperatures and expand at austenite temperatures. This gives nickel-titanium alloys excellent self-expansion. However, the long-term placement of nickel-titanium alloy biliary stents can increase the difficulty of stent removal due to biliary epithelial hyperplasia. Furthermore, abnormal bile duct wall tissue (primarily malignant biliary tumors) can grow through the mesh of the nickel-titanium alloy biliary stent into the lumen, causing re-obstruction.
[0005] 2. Plastic stents are relatively inexpensive, easy to replace, and have certain wear resistance, fatigue resistance, elasticity, anti-coagulant properties, and biocompatibility. However, the use of plastic stents has a high incidence of bile duct re-obstruction within a short period of time. This is mainly due to the deposition of bacteria (aerobic and anaerobic bacteria) and sticky protein-like substances forming a biofilm on the stent surface, as well as the bile sludge formed by the aggregation of bilirubin calcium and calcium palmitate. It is also related to the shape design of the stent and the material of the stent. Generally, the obstruction rate of plastic stents is 30% after 3 months of implantation, and the obstruction rate is about 70% after 6 months. The main reason for the re-obstruction of plastic stents is that the mechanical properties of the plastic stent itself can only be maintained by keeping the caliber small.
[0006] Therefore, it is necessary to invent a biliary stent and a nasobiliary irrigation and drainage device, a preparation method and a use method to solve the above problems. Utility Model Content
[0007] The purpose of the present utility model is to provide a biliary stent and a nasobiliary irrigation and drainage device, a preparation method and a use method, so as to solve the problem proposed in the above background technology that the simultaneous placement of a biliary stent and a nasobiliary duct can solve the problem of bile duct patency and bile obstruction, but there is a problem that the biliary stent may be removed when the nasobiliary duct is removed.
[0008] To achieve the above objectives, the present invention provides the following technical solutions: a biliary stent and a nasobiliary irrigation and drainage device, wherein one end of the irrigation and drainage device is connected to the nasobiliary body, and the other end of the irrigation and drainage device is connected to the biliary stent, and the irrigation and drainage device has the characteristic of controllable self-dissolution, and comprises:
[0009] A first branch, a second branch, and a pipe connector; the first branch and the second branch are integrally formed into a mesh-shaped hollow structure, and the outer diameters of the first branch and the second branch are respectively consistent with the inner diameters of the donor bile duct and the recipient bile duct;
[0010] The delivery unit is arranged on the outer surface of the connection between the first branch and the second branch, and the inner surfaces of the first branch and the second branch are provided with a coating; the delivery unit includes a fixed ring body, the fixed ring body is annular, the fixed ring body is fixedly connected to the connection between the first branch and the second branch, and the outer ring of the fixed ring body is a smooth surface.
[0011] Preferably, one end of the first branch away from the fixed ring body is fixedly connected to an arc-shaped circle, and the outer circle of the arc-shaped circle is chamfered.
[0012] Preferably, the top of the fixed ring body is fixedly connected to a circular arc guide rail, the outside of the circular arc guide rail is connected to a rotating ring body, and the outer ring of the rotating ring body is fixedly connected to a plurality of connecting rods;
[0013] The bottom of the connecting rod is fixedly connected to a connecting column, and the bottom of the connecting column is fixedly connected to an arc-shaped force-bearing baffle, and the arc-shaped force-bearing baffle is in contact with the fixed ring body; a guide fin is provided on the outer side of the arc-shaped force-baffle.
[0014] Preferably, the second branch and the nasobiliary duct body are in contact with each other, and the second branch and the nasobiliary duct body are fixedly connected via a pipe connector.
[0015] Preferably, the pipe connector is in a ring shape, is fixedly connected between the second branch and the nasobiliary duct body, and is made of aluminum metal material.
[0016] Preferably, the first branch, the second branch, the arc-shaped circle, and the interior of the nasobiliary duct body are interconnected.
[0017] Preferably, the thickness of the film is 0.1 mm; the surface of the film is coated with a drug coating, and the drug coating includes: rapamycin, everolimus, tacrolimus, and paclitaxel.
[0018] Preferably, the side length of the grid unit of the net-like hollow structure on the first branch and the second branch is 0.1 mm; the length of the first branch and the second branch are both 20 mm, the thickness of the first branch and the second branch are both 0.3 mm, and the coating covers the area within 10 mm above and below the connection.
[0019] A preparation method, comprising the above-mentioned biliary stent and nasobiliary irrigation and drainage device; and further comprising the following preparation method:
[0020] (1) Medical polyurethane is prepared into an electrospinning solution; medical polyurethane is dissolved in a solvent and stirred at room temperature for 5 to 8 hours to obtain a uniform solution with a concentration of 3% to 15%, wherein the solvent is any one of dioxane, dimethylformamide, tetrahydrofuran and dimethylformamide;
[0021] (2) The electrospinning solution obtained in the above step is sucked into the electrospinning solution tube, and a mold rod with a smooth surface and the same diameter as the inner diameter of the mesh bile duct stent is fixed on a speed-adjustable rotating body. The rotation speed of the rotating body is 50 rpm-2000 rpm, the high-voltage power supply for electrospinning outputs a voltage of 5KV-30KV, the distance between the nozzle of the spinning solution tube and the mold rod is 5cm-30cm, the electrospinning solution is pushed out at a speed of 0.04m / hour-3m / hour, and electrospinning is performed for 1 hour-15 hours to obtain an electrospun non-woven inner membrane with a thickness of 2um-15um;
[0022] (3) The selected mesh metal mesh bile duct stent is placed on the mold rod covered with the inner membrane and wait for the membrane to be completely formed.
[0023] A method of use, comprising the above-mentioned biliary stent and nasobiliary irrigation and drainage device; and further comprising the following method of use:
[0024] (1) The first and second branches of different sizes are used according to the needs, and the film covers the area within 10 mm above and below the connection. In actual use, the range of the film covering the connection can be determined according to the needs;
[0025] (2) The entire structure is inserted into the human body through the nasal cavity. During the insertion process, when the rotating ring body is subjected to forward resistance, the rotating ring body rotates inside the arc guide rail, thereby driving the arc-shaped force-bearing slider to rotate, converting the resistance into rotational force to facilitate insertion, so that the entire structure can be smoothly inserted into the predetermined position and successfully placed;
[0026] (3) After the drainage operation is completed, when the nasobiliary duct needs to be removed, a special substance that can dissolve the connection material is injected into the nasobiliary duct. Subsequently, the irrigation and drainage device at the connection between the nasobiliary duct and the biliary stent is broken, and the nasobiliary duct is removed. The broken irrigation and drainage device is exposed to the liquid metal of eutectic gallium indium and quickly disintegrates.
[0027] The technical effects and advantages of this utility model are:
[0028] 1. To solve the above clinical problems, the present invention designs an integrated structure that has both bile duct stent and nasobiliary drainage and flushing functions. One end of the device is a bile duct stent and the other end is a nasobiliary duct. The connection parts are connected by a soluble material that can be controlled by humans and has a certain supporting strength. The material is harmless to the human body after dissolution.
[0029] 2. The utility model is inserted into the bile duct and retains the nasobiliary duct. When the clinical assessment shows that the condition is stable and the nasobiliary duct needs to be removed, the liquid metal of eutectic gallium indium is injected into the nasobiliary duct into a special substance that can dissolve the connection material. Then the connection between the nasobiliary duct and the biliary stent is broken, and the nasobiliary duct is removed. The connection between the nasobiliary duct and the biliary stent is a flushing and drainage device made of special materials such as aluminum, which can be quickly disintegrated when exposed to the liquid metal of eutectic gallium indium; thus solving the problems of traditional stents being difficult to remove and re-obstruction.
[0030] 3. This utility model proposes a method for producing a coated metal stent. This method involves coating the surface of the original stent with a highly compatible, bacterial-resistant organic film (complete or partial coverage). This allows for the stent to be removed and replaced, and effectively prevents tumor growth within the stent. The incidence of postoperative pancreatitis in the uncoated and coated groups was 13.6% and 1.5%, respectively, and the incidence of postoperative cholecystitis was 11.9% and 1.5%, respectively. The median survival time was 389 days, and the median stent patency was 368 days. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.
[0032] Figure 1 It is an exploded schematic diagram of the overall structure of the utility model, the nasobiliary duct body, and the biliary stent structure.
[0033] Figure 2 It is an axial schematic diagram of the overall structure of the utility model.
[0034] Figure 3This is a schematic diagram of the fixed ring structure of the utility model.
[0035] Figure 4 This is a schematic diagram of the structure of the arc-shaped force-bearing baffle of the present utility model.
[0036] In the figure: 1. First branch; 2. Second branch; 3. Arc-shaped circle; 4. Fixed ring; 5. Biliary stent; 6. Pipe connector; 7. Nasobiliary duct body; 8. Arc guide rail; 9. Rotating ring; 10. Connecting rod; 11. Connecting column; 12. Arc-shaped load-bearing baffle; 13. Guide fin. DETAILED DESCRIPTION
[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0038] The utility model provides Figures 1-4 A biliary stent and a nasobiliary irrigation and drainage device are shown, one end of the irrigation and drainage device is connected to the nasobiliary body 7, and the other end of the irrigation and drainage device is connected to the biliary stent 5. The irrigation and drainage device has the characteristic of controllable self-dissolution. Specifically, the irrigation and drainage device is connected with a soluble material that can be controlled by humans and has a certain supporting strength. The material is harmless to the human body after dissolution. Products made of aluminum and other alloy elements are usually first processed into castings, forgings, foils, plates, strips, tubes, rods, profiles, etc., and then made through processes such as cold bending, sawing, drilling, assembly, and coloring. The main metal element is aluminum, and some alloy elements are added to improve the performance of the aluminum material.
[0039] The flushing and drainage device includes: a first branch 1, a second branch 2, and a pipe connector 6; the first branch 1 and the second branch 2 are an integrally formed mesh hollow structure, and the outer diameters of the first branch 1 and the second branch 2 are consistent with the inner diameters of the donor bile duct and the recipient bile duct, respectively;
[0040] The transport unit is arranged on the outer surface of the connection between the first branch 1 and the second branch 2, and the inner surfaces of the first branch 1 and the second branch 2 are provided with a coating; the transport unit includes a fixed ring body 4, which is in a circular ring shape and is fixedly connected to the connection between the first branch 1 and the second branch 2. The outer ring of the fixed ring body 4 is a smooth surface to facilitate sliding.
[0041] The first branch 1 is fixedly connected to an arc-shaped ring 3 at one end away from the fixed ring body 4, and the outer ring of the arc-shaped ring 3 is chamfered. The top of the fixed ring body 4 is fixedly connected to an arc guide rail 8, the outside of the arc guide rail 8 is connected to a rotating ring body 9, and the outer ring of the rotating ring body 9 is fixedly connected to a plurality of connecting rods 10; the bottom of the connecting rod 10 is fixedly connected to a connecting column 11, and the bottom of the connecting column 11 is fixedly connected to an arc-shaped force-bearing baffle 12, which fits with the fixed ring body 4; the outer side of the arc-shaped force-baffle 12 is provided with a guide fin 13; the transmission unit is provided, and when the entire structure is inserted into the human body, the rotating ring body 9 can generate self-rotation when it is subjected to forward resistance. Specifically, the rotating ring body 9 rotates inside the arc guide rail 8, thereby driving the arc-shaped force-bearing slider 12 to rotate, converting the resistance into rotational force, so as to facilitate insertion, so that the entire structure can be smoothly inserted into the predetermined position and placed successfully;
[0042] The second branch 2 and the nasobiliary body 7 are fitted together, and the second branch 2 and the nasobiliary body 7 are fixedly connected by a pipe connector 6. The pipe connector 6 is annular and is fixedly connected between the second branch 2 and the nasobiliary body 7. The pipe connector 6 is made of aluminum metal material.
[0043] The first branch 1, second branch 2, arcuate loop 3, and nasobiliary duct body 7 are interconnected. The coating is 0.1 mm thick and coated with a drug coating containing rapamycin, everolimus, tacrolimus, and paclitaxel. The mesh units in the hollow lattice structure of the first and second branches 1 and 2 have a side length of 0.1 mm. The lengths of the first and second branches are both 20 mm, and the thickness of the first and second branches is 0.3 mm. The coating covers an area within 10 mm above and below the junction.
[0044] This embodiment also discloses a preparation method, including the above-mentioned biliary stent and nasobiliary irrigation and drainage device; and also includes the following preparation method: (1) preparing medical polyurethane into an electrospinning solution; dissolving the medical polyurethane in a solvent, stirring at room temperature for 5 hours to 8 hours, and obtaining a uniform solution with a concentration percentage of 3% to 15%, wherein the solvent is any one of dioxane, dimethylformamide, tetrahydrofuran and dimethylformamide;
[0045] (2) The electrospinning solution obtained in the above step is sucked into the electrospinning solution tube, and a mold rod with a smooth surface and the same diameter as the inner diameter of the mesh bile duct stent is fixed on a speed-adjustable rotating body. The rotation speed of the rotating body is 50 rpm-2000 rpm, the high-voltage power supply for electrospinning outputs a voltage of 5KV-30KV, the distance between the nozzle of the spinning solution tube and the mold rod is 5cm-30cm, the electrospinning solution is pushed out at a speed of 0.04m / hour-3m / hour, and electrospinning is performed for 1 hour-15 hours to obtain an electrospun non-woven inner membrane with a thickness of 2um-15um;
[0046] (3) The selected mesh metal mesh bile duct stent is placed on a mold rod covered with an inner membrane, and the membrane is allowed to fully take shape. The preparation method proposed in the present invention is a method for preparing a coated metal stent, which is to coat the surface of the original stent with an organic film (completely covered or partially covered) that has good compatibility and prevents bacterial adhesion, so that the coated stent has the characteristics of being able to be removed and replaced and effectively preventing tumors from growing into the stent. The incidence of postoperative pancreatitis in the non-membrane group and the coated group was 13.6% and 1.5%, and the incidence of postoperative cholecystitis was 11.9% and 1.5%, respectively. The median survival time was 389 days, and the median stent patency time was 368 days.
[0047] This embodiment also discloses a method of use, including the above-mentioned biliary stent and nasobiliary irrigation and drainage device; and further comprising the following: (1) using a first branch 1 and a second branch 2 of different sizes according to needs, and covering the area within 10 mm above and below the connection. In actual use, the range of the membrane covering the connection can be determined according to needs;
[0048] (2) The entire structure is inserted into the human body through the nasal cavity. During the insertion process, when the rotating ring body 9 is subjected to forward resistance, the rotating ring body 9 rotates inside the circular arc guide rail 8, thereby driving the arc-shaped force-bearing slider 12 to rotate, converting the resistance into a rotational force to facilitate insertion, so that the entire structure is smoothly inserted into the predetermined position and successfully placed;
[0049] (3) After the drainage operation is completed, when the nasobiliary duct needs to be removed, a special substance that can dissolve the connection material is injected into the nasobiliary duct. Subsequently, the irrigation and drainage device at the connection between the nasobiliary duct and the biliary stent is broken, and the nasobiliary duct is removed. The broken irrigation and drainage device is exposed to the liquid metal of eutectic gallium indium and quickly disintegrates.
[0050] In order to solve the technical problems in the background technology, the utility model is designed to have an overall structure that has both bile duct stent and nasobiliary drainage and flushing functions. One end of the device is a bile duct stent 5 and the other end is a nasobiliary duct. The connection part is connected by a soluble material that can be controlled by humans and has a certain supporting strength. The material is harmless to the human body after dissolution. The utility model is inserted into the bile duct and retains the nasobiliary duct. When the clinical assessment shows that the condition is stable and the nasobiliary duct needs to be removed, the liquid metal of eutectic gallium indium is injected into the special soluble connection part material in the nasobiliary duct body 7. Then the connection part between the nasobiliary duct body 7 and the biliary stent 5 is broken, and the nasobiliary duct body 7 is removed. The connection part between the nasobiliary duct body 7 and the biliary stent 5 is a flushing and drainage device made of special materials such as aluminum. Hydraulic metal is an amorphous, flowable liquid metal, which can be regarded as a mixture of positive ion fluid and free electron gas. Liquid metal is a deformable body. The liquid metal of eutectic gallium indium is an unconventional ultra-light material composed of hollow glass microspheres and gallium indium eutectic. When controlled by an electric field, the complex of liquid metal and water can be converted between various forms and movement modes. The liquid metal can swallow a small amount of aluminum material. This feature can be used to quickly decompose the material pipeline connector 6. The material in the utility model can be quickly disintegrated when exposed to the liquid metal of eutectic gallium indium, solving the problems of difficult removal and re-obstruction of traditional stents.
[0051] Any numerical value cited herein includes all values of the lower and upper values in increments of one unit from the lower value to the upper value, provided that there is at least a two-unit interval between any lower value and any higher value. For example, if the value of a component quantity or process variable (e.g., temperature, pressure, time, etc.) is stated to be from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended to illustrate that values such as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc. are also explicitly listed in this specification. For values less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples intended to be clear, and it is to be understood that all possible combinations of numerical values listed between the lowest and highest values are expressly set forth in this specification in a similar manner.
[0052] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. When used with a range, "about" or "approximately" applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30," including at least the specified endpoints.
[0053] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." when describing a combination should include the identified elements, ingredients, components, or steps and other elements, ingredients, components, or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, components, or steps herein also contemplates embodiments consisting essentially of these elements, ingredients, components, or steps. By using the term "may," it is intended to indicate that any attribute described as "may" be optional.
[0054] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.
[0055] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a disclaimer of such subject matter, nor should it be considered that the inventors did not consider such subject matter to be part of the disclosed utility model subject matter.
Claims
1. A biliary stent and a nasobiliary irrigation and drainage device, wherein one end of the irrigation and drainage device is connected to the nasobiliary duct body, and the other end of the irrigation and drainage device is connected to the biliary stent, characterized in that: The flushing and drainage device comprises: First Branch; Second Branch; Pipeline connector; the first branch and the second branch are integrally formed mesh hollow structures, and the outer diameters of the first branch and the second branch are respectively consistent with the inner diameters of the donor bile duct and the recipient bile duct; The delivery unit is arranged on the outer surface of the connection between the first branch and the second branch, and the inner surfaces of the first branch and the second branch are provided with a coating; the delivery unit includes a fixed ring body, the fixed ring body is in a circular ring shape, and the fixed ring body is fixedly connected to the connection between the first branch and the second branch.
2. A biliary stent and nasobiliary duct irrigation and drainage device according to claim 1, characterized in that: The outer ring of the fixing ring body has a smooth surface.
3. A biliary stent and nasobiliary duct irrigation and drainage device according to claim 1, characterized in that: An end of the first branch away from the fixed ring body is fixedly connected to an arc-shaped circle, and an outer circle of the arc-shaped circle is provided with a chamfer.
4. A biliary stent and nasobiliary duct irrigation and drainage device according to claim 1, characterized in that: The top of the fixed ring body is fixedly connected to a circular arc guide rail, the outside of the circular arc guide rail is connected to a rotating ring body, and the outer ring of the rotating ring body is fixedly connected to a plurality of connecting rods.
5. A biliary stent and nasobiliary duct irrigation and drainage device according to claim 4, characterized in that: The bottom of the connecting rod is fixedly connected to a connecting column, and the bottom of the connecting column is fixedly connected to an arc-shaped force-bearing baffle, and the arc-shaped force-bearing baffle is in contact with the fixed ring body; a guide fin is provided on the outer side of the arc-shaped force-baffle.
6. A biliary stent and nasobiliary duct irrigation and drainage device according to claim 1, characterized in that: The second branch is fitted with the nasobiliary duct body, and the second branch is fixedly connected to the nasobiliary duct body via a pipe connector.
7. The biliary stent and nasobiliary duct irrigation and drainage device according to claim 1, characterized in that: The pipe connector is in a circular ring shape and is fixedly connected between the second branch and the nasobiliary duct body. The pipe connector is made of aluminum metal material.
8. The biliary stent and nasobiliary duct irrigation and drainage device according to claim 1, characterized in that: The first branch, the second branch, the arc-shaped circle, and the interior of the nasobiliary duct body are interconnected.
9. The biliary stent and nasobiliary duct irrigation and drainage device according to claim 1, characterized in that: The thickness of the film is 0.1 mm; the surface of the film is coated with a drug coating, and the drug coating includes: rapamycin, everolimus, tacrolimus, and paclitaxel.
10. The biliary stent and nasobiliary duct irrigation and drainage device according to claim 1, characterized in that: The side length of the grid unit of the net-like hollow structure on the first branch and the second branch is 0.1 mm; the length of the first branch and the second branch are both 20 mm, the thickness of the first branch and the second branch are both 0.3 mm, and the coating covers the area within 10 mm above and below the connection.