Inner stent for common bile duct

Abstract

The utility model provides a common bile duct inner support. The common bile duct inner support comprises a first hook-shaped part used for supporting a common bile duct, a second hook-shaped part used for being connected with a duodenum and a drainage part. Two ends of the drainage part are respectively connected with a first hook-shaped part and a second hook-shaped part, and the second hook-shaped part is arranged at one end far away from the first hook-shaped part; the radian angle of the first hook-shaped part is larger than that of the second hook-shaped part; a certain included angle is formed between the plane where the first hook-shaped part is located and the plane where the second hook-shaped part is located. And at least two drainage holes are formed in the drainage part. The first hook-shaped part used for supporting the common bile duct and the second hook-shaped part used for being connected with the duodenum are arranged, the common bile duct is supported through the first hook-shaped part, and the duodenum is connected through the second hook-shaped part, so that the stent in the common bile duct is not prone to retracting into the common bile duct, and the problem of bile leakage caused by premature falling is solved. A drainage hole is formed in the drainage part, and the problem that circulation of bile and pancreatic juice is affected is solved.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a common bile duct stent. Background Art

[0002] Cholelithiasis is a common and frequently occurring disease. Common treatments for gallbladder stones combined with common bile duct stones include:

[0003] Traditional open cholecystectomy plus common bile duct incision plus "T" tube drainage; this treatment method can directly contact the lesion and has strong controllability, but it is prone to postoperative pain and incision infection, and the cosmetic effect is poor.

[0004] Laparoscopic cholecystectomy plus common bile duct incision and lithotomy plus "T" tube drainage; it extends the surgical field of view, has a small incision, light postoperative pain, and quick recovery. However, the "T" tube is left in place, which increases the workload of postoperative "T" care and reduces the patient's quality of life.

[0005] Laparoscopic common bile duct lithotomy plus internal stent placement for primary common bile duct suture; it allows for a wider and clearer surgical field of view, smaller surgical incisions, and faster recovery, while also allowing for simultaneous management of gallbladder stones and common bile duct stones, reducing medical costs and the chance of postoperative bile leakage without the need for a "T" tube.

[0006] Laparoscopic common bile duct incision and lithotomy plus stent placement for primary suturing of the common bile duct has good results and few disadvantages, so it has been widely used. Among them, the common bile duct stent plays an important role in postoperative recovery, and the common bile duct stent directly affects the effect of the operation. However, the current common bile duct stent has problems such as the stent easily retracting into the common bile duct, easily falling off prematurely causing bile leakage, and easily blocking the common bile duct and affecting the circulation of bile and pancreatic juice.

[0007] Therefore, there is a need for a solution to solve the above problems. Utility Model Content

[0008] In view of the defects in the prior art, the utility model proposes a common bile duct stent to achieve better postoperative recovery effect.

[0009] In order to solve the above technical problems, the technical solution of the utility model is:

[0010] A common bile duct stent comprises: a first hook-shaped portion for supporting the common bile duct, a second hook-shaped portion for connecting the duodenum, and a drainage portion;

[0011] One end of the drainage portion is connected to the first hook-shaped portion; the other end of the drainage portion is connected to the second hook-shaped portion, and the second hook-shaped portion is arranged at an end away from the first hook-shaped portion;

[0012] The arc angle of the first hook-shaped portion is greater than the arc angle of the second hook-shaped portion;

[0013] There is a certain angle between the plane where the first hook-shaped portion is located and the plane where the second hook-shaped portion is located;

[0014] The drainage part is provided with at least two drainage holes.

[0015] In a specific embodiment, the diameter range of the arc-shaped area covered by the first hook-shaped portion and the second hook-shaped portion is between 6 mm and 10 mm.

[0016] In a specific embodiment, the arc angle of the first hook portion is between 80 degrees and 190 degrees;

[0017] The arc angle of the second hook portion is between 270 degrees and 360 degrees.

[0018] In a specific embodiment, the angle between the plane where the first hook-shaped portion is located and the plane where the second hook-shaped portion is located is between 90 degrees and 180 degrees.

[0019] In a specific embodiment, the diameter of the middle drainage hole on the drainage portion is larger than the diameters of the drainage holes at both ends.

[0020] In a specific embodiment, the drainage portion is a flexible tubular structure.

[0021] In a specific embodiment, the length of the drainage portion matches the length of the common bile duct, and the length of the drainage portion is between 120 mm and 180 mm.

[0022] In a specific embodiment, at least one marking band for marking a position is provided on the first hook-shaped portion, the drainage portion, and the second hook-shaped portion.

[0023] In a specific embodiment, the first hook-shaped portion, the drainage portion, and the second hook-shaped surface are all provided with a smooth structure.

[0024] In a specific embodiment, the first hook-shaped portion, the drainage portion, and the second hook-shaped portion are integrally formed.

[0025] Beneficial effects:

[0026] The utility model is provided with a first hook-shaped portion for supporting the common bile duct and a second hook-shaped portion for connecting to the duodenum. The common bile duct is supported by the first hook-shaped portion and the duodenum is connected by the second hook-shaped portion, so that the stent in the common bile duct is not easy to retract into the common bile duct, and the problem of bile leakage caused by premature detachment is avoided. The drainage part is provided with a drainage hole, which solves the problem of affecting the circulation of bile and pancreatic juice. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a diagram showing the location relationship of some organs in the human body;

[0029] Figure 2 This is a schematic diagram of the position relationship of the stent in the common bile duct;

[0030] Figure 3 This is an enlarged view of the details of the position of the stent in the common bile duct;

[0031] Figure 4 This is a structural diagram of a common bile duct stent according to an embodiment;

[0032] Figure 5 A structural diagram of a common bile duct stent according to another embodiment;

[0033] Figure 6 A three-dimensional diagram of a common bile duct stent according to an embodiment;

[0034] Figure 7 A side view of a common bile duct stent according to an embodiment;

[0035] Figure 8 This is an enlarged view of the details of the common bile duct stent in one embodiment.

[0036] Reference numerals:

[0037] 1- common bile duct stent; 11- first hook; 101- marking band; 12- second hook; 13- drainage part; 301- drainage hole; 3- pancreas; 4- liver; 5- common bile duct; 6- duodenum; 61- sphincter of Oddi; 7- stomach; 8- gallbladder. DETAILED DESCRIPTION

[0038] In the following, various embodiments of the present disclosure will be described more fully. The present disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present disclosure to the specific embodiments disclosed herein, but rather the present disclosure should be understood to cover all adjustments, equivalents and / or alternatives that fall within the spirit and scope of the various embodiments of the present disclosure.

[0039] Hereinafter, the terms "include" or "may include" used in various embodiments of the present disclosure indicate the presence of disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. In addition, as used in various embodiments of the present disclosure, the terms "include", "have", and their cognates are intended only to indicate specific features, numbers, steps, operations, elements, components, or a combination of the foregoing, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components, or a combination of the foregoing or the possibility of adding one or more features, numbers, steps, operations, elements, components, or a combination of the foregoing.

[0040] In various embodiments of the present disclosure, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the words listed at the same time. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0041] The expressions (such as "first", "second", etc.) used in the various embodiments of the present disclosure may modify the various constituent elements in the various embodiments, but may not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of the present disclosure, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0042] It should be noted that if it is described that one component element is “connected” to another component element, the first component element may be directly connected to the second component element, and a third component element may be “connected” between the first component element and the second component element. Conversely, when one component element is “directly connected” to another component element, it can be understood that there is no third component element between the first component element and the second component element.

[0043] The term “user” used in various embodiments of the present disclosure may indicate a person using an electronic device or a device (eg, an artificial intelligence electronic device) using the electronic device.

[0044] The terms used in the various embodiments of the present disclosure are only used for the purpose of describing specific embodiments and are not intended to limit the various embodiments of the present disclosure. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the meanings commonly understood by ordinary technicians in the field to which the various embodiments of the present disclosure belong. The terms (such as the terms defined in the generally used dictionary) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments of the present disclosure.

[0045] Example

[0046] like Figure 1 As shown, the common bile duct 5 refers to a section of the pipe connecting the gallbladder 8 and the duodenum 6, which is used for the excretion of bile. Among them, the duodenum 6 is located between the stomach 7 and the jejunum, and is a part of the digestive system; it starts from the pylorus of the stomach 7, is connected to the pyloric part of the stomach 7, and extends to the jejunum. The gallbladder 8 is a small sac-shaped organ located at the lower edge of the liver 4, and its main function is to store and concentrate bile; the gallbladder 8 is connected to the liver 4 through the cystic duct. The common bile duct 5 is a pipe that discharges the bile stored in the gallbladder 8 into the duodenum 6 to help digest fat; between the gallbladder 8 and the duodenum 6, the common bile duct 5 and the main pancreatic duct of the pancreas 3 meet to form a common excretion hole (Oddi sphincter 61) for the gallbladder and pancreas to enter the duodenum 6; the Oddi sphincter 61 is located at the entrance of the duodenum 6, and controls the opening and closing of the bile duct and the pancreatic duct to regulate the discharge of bile and pancreatic juice into the duodenum 6, thereby promoting the digestion process.

[0047] The utility model provides a common bile duct stent, such as Figures 2 to 8 As shown, it includes: a first hook-shaped portion 11 for supporting the common bile duct 5, a second hook-shaped portion 12 for connecting the duodenum 6 and a drainage portion 13;

[0048] One end of the drainage portion 13 is connected to the first hook portion 11, and the other end of the drainage portion 13 is connected to the second hook portion 12. The second hook portion 12 is arranged at an end away from the first hook portion 11;

[0049] Specifically, the first hook-shaped portion 11, the drainage portion 13, and the second hook-shaped portion 12 are connected in sequence;

[0050] The arc angle of the first hook-shaped portion 11 is greater than the arc angle of the second hook-shaped portion 12;

[0051] like Figure 7 As shown, there is a certain angle between the plane where the first hook-shaped portion 11 is located and the plane where the second hook-shaped portion 12 is located;

[0052] like Figures 4 to 6 As shown, at least two drainage holes 301 are provided on the drainage portion 13; the drainage holes 301 are used to promote the discharge of bile or pancreatic juice to avoid accumulation in the common bile duct 5, thereby alleviating corresponding symptoms and reducing the occurrence of complications.

[0053] Preferably, if Figure 8 As shown, the drainage holes 301 on the drainage portion 13 are evenly arranged.

[0054] Due to reasons such as the healing of surgical incisions, the bile duct may be blocked again. The drainage hole 301 can ensure the smooth discharge of bile and avoid the occurrence of blockage again. It also helps to avoid infection and relieve the patient's symptoms such as biliary colic and abdominal distension.

[0055] Furthermore, the diameter range of the arc-shaped area covered by the first hook-shaped portion 11 is adapted to the inner diameter of the supporting position of the common bile duct 5, and the diameter range of the arc-shaped area covered by the first hook-shaped portion 11 is 1 to 1.5 times the general inner diameter of the common bile duct 5;

[0056] The second hook-shaped portion 12 is adapted to the inner diameter of the sphincter of Oddi 61 of the duodenum 6 , and the diameter range of the arc-shaped area covered by the second hook-shaped portion 12 is 1 to 3 times the inner diameter of the sphincter of Oddi 61 in the expanded state.

[0057] Specifically, the second hook-shaped portion 12 is connected to the sphincter of Oddi 61 of the duodenum 6 , thereby preventing the stent 1 in the common bile duct from shifting or falling off prematurely.

[0058] In an adult, the common bile duct 5 generally has an inner diameter of about 6 mm, which may vary due to personal factors and the presence of diseases, such as bile duct stones, bile duct stenosis, and bile duct infection, which may cause the common bile duct 5 to have a reduced inner diameter or become blocked, thereby affecting the normal flow of bile.

[0059] The duodenum 6 generally has an inner diameter of about 2 to 3 cm, and the duodenum 6 and the common bile duct 5 are connected via the muscle tissue of the sphincter of Oddi 61. Under normal circumstances, the diameter of the sphincter of Oddi 61 is about 1 to 2 mm.

[0060] However, when the digestive juice needs to be discharged into the duodenum 6, the Oddi sphincter 61 relaxes and expands so that bile and pancreatic juice can pass smoothly. In this case, the diameter of the Oddi sphincter 61 may increase to about 3-5 mm.

[0061] The diameter of the first hook-shaped portion 11 is set to be 1 to 1.5 times the general inner diameter of the common bile duct 5, which can ensure that the common bile duct stent 1 has a good fit with the common bile duct 5, and is neither too tight nor too loose. Such an adaptive design helps to reduce damage and stimulation to the common bile duct 5 and improve the comfort of the patient;

[0062] The diameter range of the arc area covered by the first hook-shaped portion 11 is slightly larger than the inner diameter of the common bile duct 5, which can increase the fixation and stability of the common bile duct stent 1 in the common bile duct 5; the common bile duct stent 1 designed in this way can be more firmly positioned in the common bile duct 5, reducing the risk of displacement or falling.

[0063] The diameter range of the arc area covered by the second hook-shaped portion 12 is 1 to 3 times the inner diameter of the Oddi sphincter 61 in the expanded state. Considering the physiological characteristics of the Oddi sphincter 61, it has strong compatibility and can avoid excessive compression or obstruction of the Oddi sphincter 61 by the common bile duct stent 1, thereby ensuring the normal discharge of bile and pancreatic juice.

[0064] To sum up, the design of the size of the first hook-shaped portion 11 and the second hook-shaped portion 12 is relatively reasonable, which can provide better adaptability, stability and compatibility, ensure the safe and effective treatment of the common bile duct stent 1, improve the positioning accuracy and support stability of the common bile duct stent 1, and play an important role in the treatment process; it can also minimize complications and discomfort and improve the treatment effect.

[0065] Furthermore, the diameter range of the arc-shaped area covered by the first hook-shaped portion 11 and the second hook-shaped portion 12 is between 6 mm and 10 mm.

[0066] Firstly, the size design of the first hook-shaped portion 11 and the second hook-shaped portion 12 fully considers the physiological characteristics of the human body, can meet the surgical needs of most patients, and has strong versatility.

[0067] Secondly, the diameter ranges of the arc-shaped areas covered by the first hook-shaped portion 11 and the second hook-shaped portion 12 are the same, which simplifies the manufacturing process of the common bile duct stent 1, helps to improve production efficiency and reduce production costs.

[0068] Finally, the diameter range of the arc-shaped area covered by the first hook-shaped portion 11 and the second hook-shaped portion 12 is between 6 mm and 10 mm, so that the common bile duct stent 1 has strong support and connection stability during use, and the common bile duct stent 1 is not easy to fall off prematurely, which helps to better play the auxiliary role of the common bile duct stent 1 and achieve better postoperative effects. Taking into account the comfort of the patient's postoperative recuperation, the use of a suitable size can not only play the role of the common bile duct stent 1, but also reduce the patient's discomfort.

[0069] Preferably, the diameter range of the arc-shaped area covered by the first hook-shaped portion 11 and the second hook-shaped portion 12 is between 7 mm and 9 mm.

[0070] Further preferably, the diameter ranges of the arc-shaped areas covered by the first hook-shaped portion 11 and the second hook-shaped portion 12 are set to be the same.

[0071] Furthermore, the arc angle of the first hook-shaped portion 11 is between 80 degrees and 190 degrees; the arc angle of the second hook-shaped portion 12 is between 270 degrees and 360 degrees.

[0072] The design of different arc angles of the first hook portion 11 and the second hook portion 12 fully takes into account the different connection positions and specific functions of the first hook portion 11 and the second hook portion 12. The first hook is used to support the common bile duct 5, which is prone to falling off, while the second hook portion 12 is connected to the Oddi sphincter 61 in the duodenum 6. In this connection state, the second hook portion 12 often retracts or falls off, resulting in the inability of the common bile duct stent 1 to fully play its role, thereby affecting postoperative recovery.

[0073] The arc angle of the second hook 12 is designed to be between 270 and 360 degrees, which can prevent the common bile duct stent 1 from retracting into the common bile duct 5 and maintain the current connection status; the arc angle of the first hook 11 is designed to be between 80 and 190 degrees, which is convenient for doctors to cut according to the expansion of the common bile duct 5, and can also better fit the curvature of the common bile duct 5, which helps to obtain a higher fit and reduce damage and irritation to the bile duct wall. The effect of retaining it for 7-14 days before it will slip off and enter the intestine by itself is achieved, preventing the common bile duct stent 1 from slipping off prematurely and causing bile leakage; in the later stage, as the inflammation of the sphincter of Oddi 61 subsides, the common bile duct stent 1 will automatically slip into the intestine and be discharged with feces.

[0074] Preferably, the arc angle of the first hook-shaped portion 11 is between 90 degrees and 180 degrees; and the arc angle of the second hook-shaped portion 12 is 360 degrees.

[0075] Furthermore, the angle between the plane where the first hook-shaped portion 11 is located and the plane where the second hook-shaped portion 12 is located is between 90 degrees and 180 degrees.

[0076] Specifically, in some embodiments, Figure 7 As shown, the angle between the plane where the first hook-shaped portion 11 is located and the plane where the second hook-shaped portion 12 is located is 180 degrees.

[0077] That is, the first hook-shaped portion 11 is not only located at different ends of the common bile duct stent 1, but also at different sides of the common bile duct stent 1. The first hook-shaped portion 11 and the second hook-shaped portion 12 are located on opposite sides. Such a design helps to enhance the stability of the common bile duct stent 1. The directions of the forces at the two ends of the common bile duct stent 1 are different, and a dynamic balance of the forces is achieved, so that the common bile duct stent 1 can better maintain its position and reduce the risk of displacement or slippage.

[0078] Furthermore, the diameter of the middle drainage hole 301 on the drainage portion 13 is larger than the diameters of the drainage holes 301 at both ends.

[0079] The design of the drainage hole 301 helps to better play the role of unobstructed drainage of bile and pancreatic juice, so as to avoid the occurrence of high pressure in the common bile duct 5 after the bile duct is sutured, thereby preventing bile leakage.

[0080] When the diameter of the drainage hole 301 in the middle of the common bile duct stent 1 is larger, bile will preferentially flow out from the drainage hole 301 in the middle, so that the bile flows faster, effectively reducing the pressure in the common bile duct 5 and reducing bile stasis in the common bile duct 5;

[0081] The drainage holes 301 at both ends have relatively small diameters, which can effectively prevent bile from flowing back from the intestine into the common bile duct 5 and avoid causing infection or other complications.

[0082] like Figure 8 As shown, the dotted line in the figure represents the central axis of the drainage hole 301; the central axes of all the drainage holes 301 arranged on the drainage part 13 are parallel to each other.

[0083] The central axes of all the drainage holes 301 being parallel to each other is helpful to achieve a better drainage effect and make the bile flow more smoothly.

[0084] Furthermore, the drainage portion 13 is a flexible tubular structure.

[0085] Specifically, in some embodiments of the present application, the common bile duct stent 1 is made of polyurethane material, and the drainage portion 13 is a polyurethane tubular structure, which has the advantages of good flexibility and soft texture, and will not damage the intestinal tract during placement.

[0086] Of course, there is no limitation on the specific material of the common bile duct stent 1 .

[0087] Furthermore, the length of the drainage portion 13 is between 120 mm and 180 mm, which fully takes into account the physiological status of the human body.

[0088] Generally speaking, taking into account the curved portion of the common bile duct 5 , the total length of the common bile duct 5 of an adult is between 100 mm and 150 mm; the length of the drainage portion 13 is between 120 mm and 180 mm, which can better adapt to the length of the common bile duct 5 and meet usage requirements.

[0089] Preferably, the length of the drainage portion 13 is between 140 mm and 160 mm.

[0090] Furthermore, at least one marking band 101 for marking a position is provided on the first hook-shaped portion 11 , the drainage portion 13 , and the second hook-shaped portion 12 .

[0091] The marking band 101 can provide a reference for the placement of the common bile duct stent 1, helping the doctor to accurately guide the common bile duct stent 1 into the common bile duct 5 and ensure its correct position; the doctor can determine whether the common bile duct stent 1 is successfully placed by observing the position of the marking band 101.

[0092] Once the common bile duct stent 1 is placed in place, the marker band 101 can serve as an important reference point to help doctors monitor the position and stability of the common bile duct stent 1 during subsequent follow-up and examinations. By comparing the position changes of the marker band 101, doctors can evaluate the effect of the common bile duct stent 1 and whether further treatment is needed.

[0093] The marking band 101 can also be used for postoperative management. For example, when the common bile duct stent 1 needs to be replaced or adjusted, the doctor can perform precise operations based on the position of the marking band 101 to avoid unnecessary damage to surrounding tissues.

[0094] Furthermore, the surfaces of the first hook-shaped portion 11 , the drainage portion 13 , and the second hook-shaped portion 12 are all provided with a smooth structure.

[0095] The smooth structure of the surface of the common bile duct stent 1 helps to prevent the common bile duct 5 from being blocked, thereby maintaining the patency of the common bile duct 5 .

[0096] Inhibiting the growth and reproduction of bacteria or other pathogenic microorganisms on the surface of the stent helps to reduce the risk of infection related to the stent 1 in the common bile duct and reduce the occurrence of postoperative complications.

[0097] It can also improve the compatibility of the common bile duct stent 1 with surrounding tissues, reduce stimulation and damage to tissues, and reduce the risk of rejection or other adverse reactions in patients.

[0098] Furthermore, the first hook portion 11, the drainage portion 13, and the second hook portion 12 are integrally formed. The integral forming can simplify the production process, improve production efficiency, accurately control the use of materials, and reduce waste; the integral forming can also produce a more uniform and higher strength common bile duct stent 1, so that the structure of the common bile duct stent 1 has greater stability.

[0099] The embodiments of the present application have at least the following beneficial effects:

[0100] The size design of the common bile duct stent 1 fully considers the physiological characteristics of the human body, which helps to achieve a better supporting effect, so that the common bile duct stent 1 is not easy to fall off prematurely during use. A drainage hole 301 is provided. The relevant design of the drainage hole 301 is conducive to avoiding blockage of the common bile duct 5 and avoiding problems affecting the circulation of bile. A marking band 101 is provided to facilitate positioning and placement. The surface is provided with a smooth structure to reduce the risk of related infections. The one-piece molding design has strong structural stability.

[0101] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily required for implementing the present utility model.

[0102] Those skilled in the art will appreciate that the modules in the device in the implementation scenario can be distributed in the device in the implementation scenario according to the implementation scenario description, or can be changed accordingly and located in one or more devices different from the implementation scenario. The modules in the above implementation scenario can be combined into one module, or can be further split into multiple sub-modules.

[0103] The above serial numbers of the utility model are for description only and do not represent the advantages or disadvantages of the implementation scenarios.

[0104] The above disclosure only discloses several specific implementation scenarios of the present invention. However, the present invention is not limited thereto, and any changes that can be conceived by technicians in this field should fall within the protection scope of the present invention.

Claims

1. A common bile duct stent, characterized in that: include: a first hook-shaped portion for supporting the common bile duct, a second hook-shaped portion for connecting to the duodenum, and a drainage portion; One end of the drainage portion is connected to the first hook-shaped portion; the other end of the drainage portion is connected to the second hook-shaped portion, and the second hook-shaped portion is arranged at an end away from the first hook-shaped portion; The arc angle of the first hook-shaped portion is greater than the arc angle of the second hook-shaped portion; There is a certain angle between the plane where the first hook-shaped portion is located and the plane where the second hook-shaped portion is located; The drainage part is provided with at least two drainage holes.

2. A common bile duct stent according to claim 1, characterized in that The diameter range of the arc-shaped area covered by the first hook-shaped portion and the second hook-shaped portion is between 6 mm and 10 mm.

3. The common bile duct stent according to claim 1, characterized in that: The arc angle of the first hook portion is between 80 degrees and 190 degrees; The arc angle of the second hook portion is between 270 degrees and 360 degrees.

4. The common bile duct stent according to claim 1, characterized in that: An angle between a plane where the first hook-shaped portion is located and a plane where the second hook-shaped portion is located is between 90 degrees and 180 degrees.

5. The common bile duct stent according to claim 1, characterized in that: The diameter of the drainage hole in the middle of the drainage part is larger than the diameters of the drainage holes at both ends.

6. The common bile duct stent according to claim 1, characterized in that: The drainage portion is a flexible tubular structure.

7. The common bile duct stent according to claim 1, characterized in that: The length of the drainage portion matches the length of the common bile duct, and the length of the drainage portion is between 120 mm and 180 mm.

8. The common bile duct stent according to any one of claims 1 to 7, characterized in that: At least one marking band for marking a position is arranged on the first hook-shaped portion, the drainage portion and the second hook-shaped portion.

9. The common bile duct stent according to any one of claims 1 to 7, characterized in that: The first hook-shaped portion, the drainage portion, and the second hook-shaped surface are all provided with a smooth structure.

10. The common bile duct stent according to any one of claims 1 to 7, characterized in that: The first hook-shaped portion, the drainage portion, and the second hook-shaped portion are integrally formed.

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