Nasobiliary drainage tube

Abstract

The utility model relates to the technical field of nasobiliary drainage, in particular to a nasobiliary drainage tube, a bulge is formed on the nasobiliary drainage tube, and the nasobiliary drainage tube can be switched between a straightening state and a using state; in the using state, the nasobiliary drainage tube is bent to form a linear section and an alpha-shaped section, and the front end of the first arc section is connected with the rear end of the straight tube section; the front end of the bent section is connected with the rear end of the first arc section; the linear section is lapped with the upstream section of the first arc section; a bulge is formed on the upstream section of the linear section, so that a limiting section is formed on the linear section; the duodenal papilla drainage tube has the beneficial effects that when the duodenal papilla drainage tube is used, the limiting section formed by the bulge can be clamped at the duodenal papilla, so that the pushing resistance of the drainage tube is changed, a medical worker can identify and position the drainage tube more quickly and accurately through the resistance change in combination with the perspective effect of X-rays, the operation time is effectively shortened, and the pain of a patient is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of nasobiliary drainage, in particular to a nasobiliary drainage tube. Background Art

[0002] Endoscopic nasobiliary drainage (ENBD) is a decompression technique for bile duct placement and drainage performed under direct duodenoscope vision for acute cholangitis or obstructive jaundice. It is simple to perform, has a high success rate, and offers few complications. It allows for accurate assessment of bile volume and properties, bile duct cleansing and cytological diagnosis, and allows for repeated cholangiography through the ENBD catheter. These advantages have effectively improved patients' conditions and have led to its widespread use in biliary surgery. Following successful endoscopic retrograde cholangiopancreatography (ERCP), a drainage tube is inserted through the endoscope into the predetermined bile duct location. It then passes through the duodenum, stomach, and esophagus, and emerges from the nasal cavity through the throat, thus establishing nasobiliary drainage.

[0003] The current nasobiliary drainage tubes on the market are not clearly visible under X-rays during clinical use. Surgeons need to spend a considerable amount of time manipulating and determining the correct placement of the tube, which greatly inconveniences the surgeon and increases the patient's pain during surgery. Furthermore, while the tube is in place, there is still a risk of the tube shifting during physiological activities. Improving the fixation of the tube not only improves the patient's ability to function but also helps reduce the risk of tube placement. Utility Model Content

[0004] (1) Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a nasobiliary drainage tube, which solves the technical problem in the prior art that after the nasobiliary drainage tube is placed, there is a risk of displacement of the drainage tube when the patient performs physiological activities.

[0006] (2) Technical solution

[0007] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0008] In a first aspect, the utility model provides a nasobiliary drainage tube, on which a protrusion is formed, and the nasobiliary drainage tube can switch between a straightened state and a use state; in the straightened state, the nasobiliary drainage tube extends in one direction; in the use state, the nasobiliary drainage tube is bent to form a straight section and an α-shaped section, the α-shaped section includes a first arc section and a second arc section connected to each other, and the front end of the first arc section is connected to the rear end of the straight tube section; wherein the second arc section includes a straight section and a curved section connected to each other, the front end of the curved section is connected to the rear end of the first arc section, and the straight section overlaps with the upstream section of the first arc section; a protrusion is formed on the upstream section of the straight section to form a limiting section on the straight section.

[0009] (3) Beneficial effects

[0010] The beneficial effect of the utility model is that the α-shaped section of the nasobiliary drainage tube of the utility model can be stuck in the duodenum of the patient, which facilitates the drainage process.

[0011] At the same time, since there is a protrusion on the straight section of the α-shaped segment, when in use, the limiting section formed by the protrusion can be stuck at the duodenal papilla, thereby changing the pushing resistance of the drainage tube. Medical staff can use this resistance change and cooperate with the perspective effect of X-rays to more quickly and accurately identify and locate the position of the drainage tube, effectively reducing operation time and reducing patient pain.

[0012] Moreover, the ridge is arranged in the upstream section of the straight section. Therefore, when the drainage tube is actually used, the ridge will be close to the bottom of the common bile duct, thereby increasing the resistance of the drainage tube to move out of the papilla and effectively reducing the risk of displacement of the drainage tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the nasobiliary drainage tube of the present invention in a bent state;

[0014] Figure 2 This is a schematic structural diagram of the utility model nasobiliary drainage tube in a straightened state.

[0015] [Description of Reference Numerals]

[0016] 1. Straight pipe section;

[0017] 2, α-shaped segment; 21, first arc segment; 22, second arc segment; 221, straight segment; 222, curved segment; 200, through-drainage hole; 210, unilateral drainage hole;

[0018] 3. Bulge;

[0019] 4. Pig tail segment;

[0020] 5. Connector assembly; 51. Lock head; 52. Lock nut; 53. Luer connector. DETAILED DESCRIPTION

[0021] In order to better explain the present invention, and to facilitate understanding, the following Figure 1 and Figure 2 The present invention is described in detail through specific implementation methods. The term "front end" refers to the end of the nasobiliary drainage tube that is located inside the body when in use, and the term "rear end" refers to the end of the nasobiliary drainage tube that is located outside the body when in use, along the extension direction of the nasobiliary drainage tube.

[0022] Example 1:

[0023] Reference Figure 1 and Figure 2 An embodiment of the present invention provides a nasobiliary drainage tube, on which a protrusion 3 is formed, and the nasobiliary drainage tube can be switched between a straightened state and a use state; in the straightened state, the nasobiliary drainage tube extends in one direction; in the use state, the nasobiliary drainage tube is bent to form a straight section 1 and an α-shaped section 2, the α-shaped section 2 includes a first arc section 21 and a second arc section 22 connected to each other, the front end of the first arc section 21 is connected to the rear end of the straight tube section 1; wherein the second arc section 22 includes a straight section 221 and a curved section 222 connected to each other, the front end of the curved section 222 is connected to the rear end of the first arc section 21, and the straight section 221 overlaps with the upstream section of the first arc section 21; a protrusion 3 is formed on the upstream section of the straight section 221 to form a limiting section on the straight section 221.

[0024] When the nasobiliary drainage tube in this embodiment is in use, the α-shaped section 2 will be stuck in the duodenum of the patient, facilitating the drainage process.

[0025] At the same time, since a protrusion 3 is provided on the straight section 221 of the α-shaped segment 2, when in use, the limiting section formed by the protrusion 3 can be stuck at the duodenal papilla, thereby changing the resistance to pushing the drainage tube. Medical staff can use this resistance change and cooperate with the perspective effect of X-rays to more quickly and accurately identify and locate the position of the drainage tube, effectively reducing the operation time and reducing the patient's pain.

[0026] Moreover, the protrusion 3 is arranged in the upstream section of the straight section 221. Therefore, when the drainage tube is actually used, the protrusion 3 will be close to the bottom of the common bile duct, thereby increasing the resistance of the drainage tube to move out of the papilla and effectively reducing the risk of displacement of the drainage tube.

[0027] At the same time, when in use, the nasobiliary drainage tube is formed with a pigtail section 4, the front end of which is connected to the rear end of the second arc section 22, and the pigtail section 4 will be stuck inside the patient's bile duct, further facilitating the drainage process.

[0028] One or both of the α-shaped section 2 and the pigtail section 4 of the nasobiliary drainage tube may be provided with a developing layer, so that medical personnel can observe the position of the drainage tube in the human body under X-ray.

[0029] Specifically, the α-shaped segment 2 comprises a first arc segment 21 and a second arc segment 22, forming a curved structure that adapts to the duodenal morphology. This design not only reduces friction and irritation of the drainage tube against the duodenal wall, but also ensures the tube's stability within the duodenum. In particular, the combination of the straight segment 221 and the curved segment 222 within the second arc segment 22 allows the drainage tube to more smoothly navigate the curved portion of the duodenum.

[0030] Protrusion 3, located upstream of straight segment 221, forms a stopper. This stopper can be locked onto the duodenal papilla, changing the push resistance to help medical staff quickly and accurately identify and locate the drainage tube. This design not only improves surgical efficiency but also reduces the pain for patients caused by repeated attempts to locate the tube.

[0031] The pigtail segment 4, an extension of the drainage tube, is designed to fit inside the bile duct, further stabilizing the tube's position and promoting bile drainage. The pigtail segment 4's softness and shape must match the internal morphology of the bile duct to minimize damage and irritation to the bile duct wall.

[0032] Providing a developing layer on the α-shaped segment 2 and / or the pigtail segment 4 allows medical personnel to clearly observe the position of the drainage tube within the human body under X-rays, thereby further ensuring the accuracy and safety of the surgery. The developing layer is typically made of a radioactive material, such as barium or iodine, which can produce a clear image under X-rays.

[0033] In summary, the nasobiliary drainage tube is designed to improve surgical efficiency, reduce patient pain, and ensure the smooth progress of the drainage process. The drainage tube has significant advantages in clinical applications.

[0034] When in use, first straighten the drainage segment and insert it onto the guide wire with the drainage point pre-positioned. Then, slowly push the tube segment along the guide wire through the biopsy channel of the duodenoscope and insert it into the corresponding position of the bile duct. When two consecutive resistance changes occur during the pushing process, combined with X-ray fluoroscopy, it can be determined whether the protrusion 3 passes through the duodenal papilla, and then the position of the drainage tube can be quickly identified, and the drainage tube can be adjusted to the target position.

[0035] After removing any other devices from the drainage tube, the other end of the tube is led out of the nostril, connected to a transfer tube or negative pressure drainage device, and secured to the external tubing, completing the placement of the nasobiliary drainage tube. Once the drainage tube is placed, protuberance 3 is located within the bile duct and near the duodenal papilla. Due to its larger cross-sectional area, protuberance 3 creates increased resistance as it enters and exits the papilla, preventing the tube from slipping out of the bile duct while it is in place.

[0036] Example 2:

[0037] Reference Figure 1 and Figure 2 In addition to all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0038] A plurality of through drainage holes 200 are provided on the downstream section of the straight section 221 close to the pigtail section 4, and the through drainage holes 200 radially penetrate the straight pipe section 1 along the first straight line; a plurality of single-sided drainage holes 210 are provided on the inner side wall of the pigtail section 4, and the penetration direction of the plurality of single-sided drainage holes 210 on the pigtail section 4 is perpendicular to the first straight line.

[0039] In this embodiment, a plurality of through-hole drainage holes 200 are provided on the downstream section of the straight section 221 near the pigtail section 4. These drainage holes radially penetrate the straight pipe section 1 along a first straight line, meaning that they extend from the outer wall to the inner wall of the straight pipe section 1, forming through-hole channels.

[0040] The design of the through-hole drainage holes 200 allows liquid to flow more smoothly from the biliary system into the drainage tube, reducing the reduction in drainage effect caused by drainage hole blockage or obstruction. At the same time, the provision of multiple drainage holes also increases the drainage area and improves drainage efficiency.

[0041] The inner wall of the pigtail segment 4 is provided with a plurality of unilateral drainage holes 210. Unlike the through-drainage holes 200 on the straight segment 221, these unilateral drainage holes 210 only penetrate the inner wall of the pigtail segment 4 and do not penetrate the outer wall. The penetration direction of the unilateral drainage holes 210 on the pigtail segment 4 is perpendicular to the first straight line. This design helps to disperse the drainage pressure in different directions, avoiding excessive concentration of bile and other fluids in a specific direction, thereby reducing irritation and damage to the biliary system. It can also more fully allow the fluid to be sucked away by the drainage tube through multi-directional drainage, thereby improving the suction effect of the drainage tube.

[0042] The unilateral drainage hole provided on the inner side of the pigtail section 4 also ensures the smoothness of the outer side of the pigtail section 4, thereby ensuring the comfort of use of the drainage tube.

[0043] In summary, the through-hole drainage holes 200 on the straight section 221 and the unilateral drainage hole 210 on the pigtail section 4 cooperate with each other to form a highly efficient drainage system for the nasobiliary drainage tube. This design not only improves drainage efficiency and effectiveness, but also fully considers patient comfort and safety.

[0044] Example 3:

[0045] Reference Figure 1 and Figure 2 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0046] The diameter of the unilateral drainage hole 210 is 1.3±0.1 mm, the diameter of the through-drainage hole 200 is 1.1±0.1 mm, and the spacing between adjacent unilateral drainage holes 210 and adjacent through-drainage holes 200 is equal and is 5.0 mm±0.5 mm.

[0047] In this embodiment, by limiting the diameter and spacing of the unilateral drainage holes 210 and the through-drainage holes 200, a balance between drainage effect and user comfort can be achieved. By limiting the diameter and spacing of the unilateral drainage holes 210 and the through-drainage holes 200 to the above ranges, a better balance between drainage effect and user comfort can be achieved.

[0048] Specifically, the diameters of the unilateral drainage holes 210 and the diametrically opposed drainage holes 200 are set to 1.1±0.1mm and 1.1±0.1mm, respectively, with equal spacing of 5.0mm±0.5mm. This reduces irritation and damage to the biliary system during drainage while maintaining adequate drainage capacity. This tolerance allows for a certain degree of manufacturing error, ensuring product manufacturability and consistency.

[0049] Example 4:

[0050] Reference Figure 1 and Figure 2 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0051] The protrusion 3 and the second arc segment 22 are an integral structure.

[0052] In this embodiment, the integrated structure means that there is no joint surface or gap between the protrusion 3 and the second arc segment 22, thereby improving the structural stability of the entire drainage tube. This stability helps reduce the risk of loosening or falling off during insertion and use of the drainage tube.

[0053] The one-piece molding process ensures precise alignment and matching between the protrusion 3 and the second arc segment 22, avoiding performance degradation due to assembly errors. This also makes the entire drainage tube manufacturing process more efficient and reliable.

[0054] Since the protrusion 3 is seamlessly connected to the second arc segment 22 , the friction and irritation that may be generated when the drainage tube moves in the bile duct are reduced, thereby reducing the patient's discomfort.

[0055] Example 5:

[0056] Reference Figure 1 and Figure 2 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0057] The inner diameter of the nasobiliary drainage tube is 5-12Fr, and the outer diameter is 7-14Fr.

[0058] In this embodiment, by limiting the inner and outer diameters of the nasobiliary drainage tube, its compatibility with the bile duct can be ensured, ensuring drainage efficiency and user comfort. By limiting the inner and outer diameters of the nasobiliary drainage tube to 5-12Fr and 7-14Fr, the compatibility between the drainage tube and the catheter can be further improved, further improving drainage efficiency and user comfort.

[0059] Specifically, Fr is the unit for measuring the diameter of medical devices, and 1Fr≈0.33mm.

[0060] The size and shape of bile ducts vary from patient to patient, so the inner and outer diameters of drainage tubes need to be flexible to accommodate diverse anatomy. Keeping the inner and outer diameters within this range ensures that the drainage tubes fit the bile ducts of most patients, neither too tight, causing insertion difficulties or duct damage, nor too loose, resulting in poor drainage or tube dislodgement.

[0061] An appropriate inner diameter helps ensure that bile and other fluids flow smoothly into the drainage tube, reducing the risk of blockage and backflow. At the same time, an appropriate outer diameter maintains the stability of the drainage tube within the bile duct, reducing displacement caused by body position changes or bile duct peristalsis, thereby further improving drainage efficiency.

[0062] The diameter of the drainage tube also affects patient comfort. A tube that is too thick may increase the patient's foreign body sensation and discomfort, while a tube that is too thin may require frequent replacement or repositioning due to insufficient drainage capacity. Therefore, choosing an appropriate diameter within this range can ensure drainage effectiveness while minimizing patient discomfort.

[0063] Example 6:

[0064] Reference Figure 1 and Figure 2 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0065] There are two ridges 3; the axial width of the two ridges 3 along the α-shaped segment 2 is 5.0±0.5 mm; the spacing between the two ridges 3 is less than 10 mm; the protrusion height of the two ridges 3 relative to the second arc segment 22 is less than or equal to 1 / 4 of the diameter of the second arc segment 22.

[0066] In this embodiment, the two protrusions 3 realize two-point positioning of the limiting section in the bile duct, which can well ensure the position of the limiting section in the bile duct, while maintaining a smaller contact area between the limiting section and the bile duct, thereby improving the patient's comfort.

[0067] By limiting the width, spacing, and height of the protrusions 3, a balance between user comfort and position-limiting performance can be achieved. By limiting the width, spacing, and height of the protrusions 3 to the above ranges, a better balance between user comfort and position-limiting performance of the drainage catheter can be achieved.

[0068] Specifically, the two protrusions 3 form a two-point positioning system within the bile duct, a design that is more stable and reliable than single-point positioning. This effectively prevents the drainage tube from rotating and shifting within the bile duct, ensuring its continued, stable operation. This positioning method also reduces excessive pressure on the bile duct wall, alleviating patient discomfort.

[0069] By limiting the width and height of the protrusion 3, the contact area between the protrusion 3 and the bile duct wall can be kept relatively small. This helps reduce friction and irritation of the drainage tube against the bile duct wall, improving patient comfort. Furthermore, a smaller contact area helps minimize bile retention and crystallization on the contact surface, reducing the risk of blockage.

[0070] The width of protrusion 3 is set at 5.0±0.5mm, which is neither too wide nor too narrow. A protrusion that is too wide may increase the contact area with the bile duct wall, causing increased discomfort; a protrusion that is too narrow may not provide sufficient positioning. The design of a spacing of less than 10mm ensures a close fit between the two protrusions 3, effectively achieving a joint positioning effect.

[0071] The height of the protrusion is less than or equal to 1 / 4 of the diameter of the second arc segment 22. This limitation is intended to maintain a moderate height for the protrusion 3. A protrusion that is too high may increase pressure on the bile duct wall; while a protrusion that is too low may not effectively prevent displacement of the drainage tube. Therefore, this size limit helps maintain a retaining effect while reducing discomfort for the patient.

[0072] By limiting the above-mentioned size and position relationship, the nasobiliary drainage tube can ensure the limiting performance while taking into account the patient's comfort, thus achieving a perfect balance between comfort of use and limiting performance.

[0073] Example 7:

[0074] Reference Figure 1 and Figure 2 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0075] The angle formed by the first arc segment 21 and the straight segment 221 close to the inner circle of the α-shaped segment 2 is 70°-90°; the angle formed by the straight tube segment 1 and the α-shaped segment 2 is 120°-140°.

[0076] In this embodiment, by limiting the included angle formed by the first arc segment 21 and the straight segment 221 near the inner circle of the α-shaped segment 2, as well as the angle formed by the straight tube segment 1 and the α-shaped segment 2, the α-shaped segment 2 can be made to match the shape of the duodenum and the straight tube segment 1 can be easily inserted into the bile duct. By limiting the above angles to the above ranges, the shape of the duodenum can be better matched and the straight tube segment 1 can be more easily inserted into the bile duct.

[0077] Specifically, the angle formed by the first arc segment 21 and the straight segment 221 near the inner circle of the α-shaped segment 2 is limited to a range of 70°-90°, fully considering the curvature of the duodenum. The duodenum exhibits a certain degree of curvature below the biliary system. This angle design allows the α-shaped segment 2 to better conform to the contours of the duodenum, reducing friction and irritation of the duodenal wall during drainage tube insertion and indwelling, thereby alleviating patient discomfort.

[0078] The angle formed by the straight tube section 1 and the α-shaped section 2 is limited to a range of 120°-140°. This design focuses on the process of inserting the drainage tube into the bile duct. The larger angle design allows the straight tube section 1 to advance more smoothly along the bile duct during insertion, reducing the risk of insertion difficulty or bile duct damage caused by improper angles. At the same time, this angle also helps the drainage tube remain stable within the bile duct, preventing it from shifting due to changes in body position or bile duct peristalsis.

[0079] By defining these two angles, the nasobiliary drainage tube not only better matches the anatomical structure of the duodenum and bile duct, improving patient comfort, but also allows for smoother insertion during surgery, reducing surgical difficulty and risk. This design embodies respect for human anatomy and the pursuit of surgical convenience in medical device design.

[0080] Example 8:

[0081] Reference Figure 1 and Figure 2 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0082] In use, the front end of the straight pipe section 1 is connected to a joint assembly 5, which is used to connect a transfer pipe or a negative pressure drainage device;

[0083] The connector assembly 5 includes a locking head 51 and a lock nut 52 that are threadedly connected to each other, and a Luer connector 53 connected to the rear end of the locking head 51. The Luer connector 53 can be connected to a transfer line or a negative pressure drainage device, and the rear end of the lock nut 52 is connected to the front end of the straight pipe section 1.

[0084] In this embodiment, the lock head 51 and the lock nut 52 are tightly connected via threads, providing a reliable seal and a stable connection to prevent fluid or gas leakage. The threaded connection is easy to operate, and can be tightened or loosened by rotating the lock head 51 or the lock nut 52, improving operational convenience and flexibility. It also provides high sealing and durability.

[0085] The Luer connector 53 is used to connect to an adapter tube or negative pressure drainage device and secure it to the extracorporeal tubing, completing the placement of a nasobiliary drainage tube. The Luer connector 53 is a standardized, micro-impermeable connector that ensures compatibility and interchangeability. The design of the Luer connector 53 allows for easy connection and disconnection while maintaining a good seal, enhancing the flexibility of drainage catheters.

[0086] It can be understood that, except for any conflicting parts, the above-mentioned embodiments 1-8 can be freely combined to form other implementation methods of the present utility model.

[0087] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0088] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0089] In the present invention, unless otherwise expressly specified or limited, when a first feature is “above” or “below” a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0090] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, article, or apparatus / device.

[0091] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A nasobiliary drainage tube, characterized in that: A protrusion (3) is formed on the nasobiliary drainage tube, and the nasobiliary drainage tube can be switched between a straightened state and a use state; In the straightened state, the nasobiliary drainage tube extends in one direction; In the usage state, the nasobiliary drainage tube is bent to form a straight tube section (1) and an α-shaped section (2), the α-shaped section (2) comprising a first circular arc section (21) and a second circular arc section (22) connected to each other, the front end of the first circular arc section (21) being connected to the rear end of the straight tube section (1); The second arc segment (22) comprises a straight segment (221) and a curved segment (222) connected to each other, the front end of the curved segment (222) is connected to the rear end of the first arc segment (21), and the straight segment (221) overlaps with the upstream segment of the first arc segment (21); The ridge (3) is formed on the upstream section of the straight section (221) to form a limiting section on the straight section (221).

2. The nasobiliary drainage tube according to claim 1, characterized in that: In the usage state, the nasobiliary drainage tube is formed with a pigtail section (4), the front end of the pigtail section (4) being connected to the rear end of the second circular arc section (22).

3. The nasobiliary drainage tube according to claim 2, wherein: A plurality of through-drainage holes (200) are provided on the downstream section of the straight section (221) close to the pigtail section (4), and the through-drainage holes (200) radially penetrate the straight pipe section (1) along a first straight line.

4. The nasobiliary drainage tube according to claim 3, wherein: The inner side wall of the pigtail section (4) is provided with a plurality of single-sided drainage holes (210).

5. The nasobiliary drainage tube according to claim 4, characterized in that: The penetration direction of the plurality of single-sided drainage holes (210) on the pigtail section (4) is perpendicular to the first straight line.

6. The nasobiliary drainage tube according to claim 5, characterized in that: The spacing between adjacent single-sided drainage holes (210) and adjacent through-drainage holes (200) is the same.

7. The nasobiliary drainage tube according to claim 1, wherein: The number of protrusions (3) is two; The protrusion height of the two protrusions (3) relative to the second circular arc segment (22) is less than or equal to 1 / 4 of the diameter of the second circular arc segment (22).

8. The nasobiliary drainage tube according to claim 1, wherein: The included angle formed by the first arc segment (21) and the straight segment (221) close to the inner circle of the α-shaped segment (2) is 70°-90°; The angle formed by the straight pipe section (1) and the α-shaped section (2) is 120°-140°.

9. The nasobiliary drainage tube according to claim 1, wherein: The front end of the straight pipe section (1) is connected to a joint assembly (5), and the joint assembly (5) is used to connect to a transfer pipe or a negative pressure drainage device.

10. The nasobiliary drainage tube according to claim 9, characterized in that: The connector assembly (5) comprises a locking head (51) and a locking nut (52) that are threadedly connected to each other, and a Luer connector (53) connected to the rear end of the locking head (51), wherein the Luer connector (53) is capable of being connected to the transfer pipe or the negative pressure drainage device, and the rear end of the locking nut (52) is connected to the front end of the straight pipe section (1).

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