A guide element, multi-lumen tube assembly, and endoscope

Abstract

The application relates to the technical field of endoscopes, in particular to a guide element, a multi-lumen tube assembly and an endoscope, which comprises a base and a first insertion part, the first insertion part is used for being arranged in a working channel of a multi-lumen tube to realize sealing cooperation with a proximal port of the working channel, a guide cavity is arranged on the base and is used for arranging a traction rope. Based on the protection of the partition wall of the traction rope channel by the guide cavity on the guide element, the cooperation of the first insertion part and the working channel on the multi-lumen tube, the structural stability can be improved, the local damage of the multi-lumen tube caused by the stress concentration of the traction rope channel can be avoided, under the same structural strength of the multi-lumen tube, the wall thickness of the multi-lumen tube can be designed to be thinner, the passing performance of the insertion part and the production cost of the endoscope are considered, long-term protection of the multi-lumen tube is realized, the attenuation speed of the directional bending control precision of the insertion part is slowed down, and the long-term stability of the bending control structure and the operation feeling of the endoscope is ensured.

Description

Technical Field

[0001] This application relates to the field of endoscope technology, and more particularly to a guide element, a multi-lumen tube assembly, and an endoscope. Background Technology

[0002] An endoscope is a medical device integrating optics, electronics, precision mechanics, and software processing. It can enter the body cavity through natural orifices or small surgical incisions to observe and manipulate internal organs. An endoscope generally consists of a handle and an insertion section. To achieve directional bending of the distal end of the insertion section, a lever and a traction wheel assembly are typically installed on the handle. The lever actuates the traction wheel assembly, which in turn winds up / releases a traction rope, pulling the distal end of the insertion section and causing it to bend in a specific direction.

[0003] To enhance the functionality of the endoscope, the existing technology sets the insertion part as a multi-lumen tube structure. Some lumens in the upper part of the tube are used to pass through the traction rope, some lumens are used to pass through the surgical instruments, and some lumens are used to pass through the irrigation fluid or negative pressure aspiration.

[0004] However, in the process of implementing this application, the applicant discovered that the accuracy of the directional bending control of the insertion part would decrease with the increase of usage time.

[0005] Research and analysis revealed two main issues: First, to control manufacturing costs, multi-lumen tubes are typically manufactured using one-piece injection molding. Simultaneously, the tube wall thickness is minimized during product design to reduce the diameter of the insertion section and improve its throughput. This limits the structural strength of the multi-lumen tube due to the trade-off between throughput and manufacturing costs. Second, to improve the precision of controlling the directional bending of the insertion section, the tension and structural strength of the traction rope are strictly controlled during product assembly. The traction rope deflects when connecting from the insertion section to the traction wheel, causing it to remain in contact with the multi-lumen tube opening. When controlling the directional bending of the insertion section, the axially reciprocating traction rope experiences reciprocating cutting wear at the tube opening. This wear intensifies with increased endoscope usage, affecting the rope's tension and structural strength. These changes in tension and strength further reduce the precision of the directional bending control. Summary of the Invention

[0006] The purpose of this application is to provide a guide element, a multi-lumen tube assembly, and an endoscope, at least to solve the technical problem that the accuracy of the directional bending control of the insertion part decreases due to changes in the tension and structural strength of the traction rope, and to ensure the long-term stability of the endoscope's bending control structure and operating feel.

[0007] This application is implemented as follows: In a first aspect, this application provides a guiding element for an endoscope, including a base and a first insertion part, the first insertion part being connected to the base and used to pass through the working channel of a multi-lumen tube to achieve a sealed fit with the proximal port of the working channel. The base is provided with a guiding cavity for passing through a traction rope to prevent the traction rope from directly contacting the proximal port of the traction rope channel of the multi-lumen tube.

[0008] Secondly, this application provides an endoscope multi-lumen tube assembly, including a multi-lumen tube and the aforementioned guiding element. The multi-lumen tube is provided with a traction rope channel and a working channel. The base is located at the proximal port of the multi-lumen tube, and the guiding channel is correspondingly provided with the traction rope channel.

[0009] Thirdly, this application provides an endoscope including a handle, an insertion part, and the aforementioned components, wherein the proximal end of the insertion part is connected to the distal end of the handle, and the insertion part includes a catheter, wherein the multi-lumen tube is disposed within the catheter.

[0010] The technical solution provided in this application can achieve the following beneficial effects: This application, based on the partition protection of the traction rope channel by the guide cavity on the guide element, and in coordination with the working channel on the first insertion part and the multi-lumen tube, not only improves structural stability but also avoids stress concentration in the traction rope channel, which could cause local damage to the multi-lumen tube. Under the same structural strength of the multi-lumen tube, the wall thickness of the multi-lumen tube can be designed to be thinner, taking into account the passage performance of the insertion part and the production cost of the endoscope, achieving long-term protection of the multi-lumen tube, slowing down the decay rate of the directional bending control accuracy of the insertion part, and ensuring the long-term stability of the endoscope bending control structure and operating feel. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of the endoscope disclosed in the embodiments of this application; Figure 2 This is a schematic diagram of the internal structure of the endoscope disclosed in the embodiments of this application; Figure 3 yes Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the structure of the multi-lumen tube assembly disclosed in the embodiments of this application; Figure 5This is a schematic diagram of the internal structure of the adapter (with the guide element in front) disclosed in the embodiments of this application; Figure 6 This is a schematic diagram of the internal structure of the adapter (with the guide element at the rear) disclosed in the embodiments of this application; Figure 7 This is a schematic diagram of the internal structure of the multi-cavity tube assembly disclosed in the embodiments of this application; Figure 8 This is a schematic diagram of the structure of the guiding element disclosed in the embodiments of this application.

[0013] In the picture: 10. Handle; 20. Insertion part; 30. Sub-lens; 100. Guiding element; 101. Traction rope; 110. Base; 120. First insertion part; 121. Guiding surface; 130. Second insertion part; 131. Guiding cavity; 200. Multi-cavity tube; 210. Working channel; 220. Traction rope channel; 230. Connecting hole; 300. Adapter; 310. Assembly channel; 320. External interface. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0015] In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0016] In various embodiments of this application, "proximal end" and "distal end" refer to the position of the endoscope and its accessories relative to the user in the usage environment. The end closer to the user is designated as the "proximal end", and the end farther from the user is designated as the "distal end".

[0017] This application provides a guide element, a multi-lumen tube assembly, and an endoscope, which are at least used to solve the problem of decreased accuracy in directional bending control of the insertion part due to changes in the tension and structural strength of the traction rope, and to ensure the long-term stability of the endoscope's bending control structure and operating feel, as described in the following embodiments.

[0018] Example 1

[0019] This embodiment provides an endoscope, such as Figure 1 and Figure 2As shown, the endoscope includes a handle 10 and an insertion part 20. The proximal end of the insertion part 20 is connected to the distal end of the handle 10. A lever structure is provided on the handle 10, which controls the directional bending of the distal end of the insertion part 20. The lever structure is existing technology and is exemplary. The lever structure includes a lever, a traction wheel, and a traction rope 101. The distal end of the traction rope 101 is connected to the distal end of the insertion part 20, and the proximal end of the traction rope 101 is connected to the traction wheel. The lever is connected to the traction wheel. By operating the lever, the traction wheel is rotated, pulling the traction rope 101 on one side of the insertion part 20 towards the proximal end, while simultaneously pulling the traction rope 101 on the other side of the insertion part 20 towards the distal end. The traction rope 101 is released to the distal end, and the traction ropes 101 on both sides of the insertion part 20 move in opposite directions, thereby causing the distal end of the insertion part 20 to bend in a specific direction. In other examples, only one traction rope 101 can control the unilateral directional bending of the insertion part 20. Multiple traction ropes 101 can also be used to achieve four-way bending of the insertion part 20. The above examples of lever structures that realize the directional bending function of the insertion part 20 can all directly adopt existing designs. An illumination unit and a camera module are provided on the distal end surface of the insertion part 20. The illumination unit is used to provide illumination light, and the camera module is used to acquire image information of the interior of the distal cavity of the insertion part 20.

[0020] Specifically, the insertion part 20 includes a catheter, within which a multi-lumen tube 200 is provided. In some examples, the multi-lumen tube 200 can also be used directly as the catheter. For example... Figures 2-7As shown, the multi-lumen tube 200 includes a traction rope channel 220 for threading a traction rope 101. The multi-lumen tube 200 also includes at least one working channel 210; preferably, the multi-lumen tube 200 includes two working channels 210. The assembly also includes an adapter 300, which has an assembly channel 310 and an external interface 320. The multi-lumen tube 200 passes through the assembly channel 310, and the external interface 320 communicates with the assembly channel 310. The external interface 320 communicates with the working channel 210 through a connecting hole 230 on the peripheral wall of the multi-lumen tube 200. The external interfaces 320 and working channels 210 are arranged in a one-to-one correspondence. One of the two external interfaces 320 is used to thread an endoscope 30, and the other serves as an instrument channel interface. Thus, the catheter can be used as a duodenal catheter, in conjunction with a choledochoscope 30, to replace the existing duodenoscope. When the multi-lumen tube 200 is equipped with only one working channel 210, the external interface 320 serves as the instrument channel interface. The instrument channel interface is used for the passage of a medium, which can be a surgical instrument, an infusion fluid, or a negative pressure aspiration fluid. The surgical instrument is a prior art instrument, such as an injection needle, a dilator, a stent, a stone retrieval basket, an optical fiber, a biopsy forceps, a hemostatic clip, etc., and is not specifically limited here. The infusion fluid can be physiological saline, a drug, or a gas, and is not specifically limited here. The negative pressure aspiration fluid can be body fluid, a sample, or a gas, and is not specifically limited here.

[0021] More specifically, such as Figures 3-8As shown, a guide element 100 is provided at the proximal end of the multi-lumen tube 200. The guide element 100 includes a base 110 and a first insertion part 120. The first insertion part 120 is connected to the base 110 and passes through the working channel 210 of the multi-lumen tube 200 to achieve a sealed fit with the proximal port of the working channel 210. A guide cavity 131 is provided on the base 110. The guide cavity 131 is used to pass through the traction rope 101. The guide cavity 131 is correspondingly arranged with the traction rope channel 220 to prevent the traction rope 101 from directly contacting the proximal port of the traction rope channel 220 of the multi-lumen tube 200. Based on the above structural design, since the traction rope 101, after being led out from the traction rope channel 220 of the multi-cavity tube 200, passes through the guide cavity 131 and then turns to connect with the traction wheel, the traction rope 101 directly abuts against the guide cavity 131 at the near-end turning point of the traction rope channel 220. When the traction rope 101 is pulled to control the distal end of the insertion part 20 to bend in a directional manner, the cutting and abrasion action generated by the traction rope 101 is mainly concentrated on the guide element 100, avoiding direct contact and wear between the multi-cavity tube 200 and the traction rope 101. At the same time, based on the cooperation between the first insertion part 120 on the guide element 100 and the working channel 210 on the multi-cavity tube 200, the force between the traction rope 101 and the guide element 100 can be distributed to the inner wall of the working channel 210 through the first insertion part 120 of the guide element 100. To avoid stress concentration in the traction rope channel 220 and causing localized damage to the multi-lumen tube 200, the wall thickness of the multi-lumen tube 200 can be designed to be thinner while maintaining the same structural strength. This improves the passability of the insertion part 20. At the same time, the sealing fit between the first insertion part 120 and the working channel 210 can also play a positioning role, preventing the position of the guide cavity 131 and the guide element 100 from shifting due to the influence of the traction rope 101. This further improves structural stability and allows the guide element 100 to provide long-term protection for the multi-lumen tube 200. This delays or avoids changes in the tension and structural strength of the traction rope 101 caused by cutting and wear near the end of the multi-lumen tube 200, slows down the rate of decrease in the directional bending control accuracy of the insertion part 20, and ensures the long-term stability of the endoscope bending control structure and operating feel. Furthermore, during the production and assembly process, the use of the guide element 100 and the multi-lumen tube 200 allows the multi-lumen tube 200 to be manufactured using an integrated injection molding process, reducing costs. After the first insertion part 120 is inserted into the proximal port of the working channel 210, the guide element 100 and the multi-lumen tube 200 can be fixedly connected. This not only allows the working channel 210 and the external interface 320 to form a stable and sealed channel by blocking the proximal port of the working channel 210, but also enables the rapid positioning of the guide cavity 131 and the traction rope channel 220, reducing the assembly difficulty of the multi-lumen tube assembly and improving the production and assembly efficiency and manufacturing cost of the endoscope.

[0022] In some embodiments, to achieve long-term stable operation of the guide element 100, the guide element 100 can be made of a rigid material, preferably a wear-resistant rigid material, and more preferably a rigid material with both wear resistance and lubrication properties, such as stainless steel, ceramic, or high-strength engineering plastic, to ensure that it resists repeated friction of the traction rope 101 without deformation or wear during long-term use. In some examples, the inner wall of the guide cavity 131 can be surface hardened or coated with a low-friction coefficient coating to further reduce the resistance and wear rate of the traction rope 101 during movement, thereby maintaining the consistency of the tension of the traction system. In addition, the overall structure of the guide element 100 can be designed as an integrated structure, which facilitates quick disassembly and assembly during maintenance or replacement, helping to extend the service life of the endoscope body and reduce clinical usage costs. In other examples, the guide element 100 can be made of acetal alloy, which has excellent self-lubricating properties, wear resistance, and dimensional stability, and can maintain the smoothness of the inner wall of the guide cavity 131 during repeated traction movements, effectively reducing the frictional wear of the traction rope 101. Meanwhile, the mechanical strength of the acetal material is sufficient to support the guide element 100 in withstanding the lateral force from the traction rope 101 during assembly and use, preventing the guide cavity 131 from shifting or failing due to deformation. In addition, the material is easy to process and shape, which is conducive to achieving a precise fit between the guide element 100 and the working channel 210 of the multi-lumen tube 200, ensuring sealing and positioning accuracy, and further improving the reliability and consistency of the overall endoscope operation.

[0023] In some embodiments, to enhance the flow performance of the medium between the external interface 320 and the working channel 210, a guide surface 121 can be provided at the distal end of the first insertion part 120. The guide surface 121 is used to guide the medium in the working channel 210 to change direction, so that when the medium enters the working channel 210 from the external interface 320 or from the working channel 210 to the external interface 320, the medium can smoothly transition along the guide surface 121, reducing flow resistance and avoiding medium eddies or jamming, ensuring that various surgical instruments, perfusion fluids or aspiration fluids can pass smoothly through the channel. At the same time, the guide surface 121 can also reduce the scraping of the instrument with the edge of the first insertion part 120 when it enters or exits the working channel 210, protecting the working end of the surgical instrument from damage and preventing the first insertion part 120 from being scraped by the instrument and causing debris to fall off, ensuring the cleanliness of the cavity and the stability of the structure. In some examples, the outer wall of the first insertion part 120 and the inner wall of the working channel 210 can be interference-fitted. The interference fit alone is sufficient to achieve a fixed connection and seal between the first insertion part 120 and the multi-cavity tube 200, eliminating the need for additional adhesive or snap-fit ​​structures. This simplifies the assembly process and avoids contamination of the working channel by adhesives or other excess materials. In other examples, a sealant groove can be provided on the outer wall of the first insertion part 120. Injecting sealant further enhances the sealing and strength of the connection between the first insertion part 120 and the working channel 210, preventing fluid leakage within the working channel 210 and ensuring pressure stability within the working channel.

[0024] In some embodiments, to enhance the structural reinforcement protection of the multi-cavity tube 200 by the guiding element 100 and reduce the assembly difficulty of the components, the guiding element 100 may further include a second insertion portion 130. The second insertion portion 130 is used to pass through the traction rope channel 220 of the multi-cavity tube 200. The guiding cavity 131 passes through the second insertion portion 130 axially, allowing the traction rope 101 to be in a stable constrained state before entering the guiding cavity 131, preventing the traction rope 101 from swaying or deviating near the end of the traction rope channel 220. At the same time, the second insertion portion 130 further completely isolates the traction rope 101 from the inner wall of the near end of the traction rope channel 220, fundamentally preventing the traction rope 101 from cutting and wearing off the near end of the traction rope channel 220. This dual protection further improves the service life of the multi-cavity tube 200. In addition, the second insertion part 130 can also play an auxiliary positioning role for the guide element 100 as a whole, forming a double-point positioning with the first insertion part 120, so that the guide cavity 131 can always be coaxially aligned with the traction rope channel 220, avoiding the guide element 100 from deflecting after long-term use, and further ensuring the stability of the movement of the traction rope 101. In some examples, to prevent the second insertion part 130 from excessively enlarging the traction rope channel 220 and affecting the normal movement of the traction rope 101 within the traction rope channel 220, a clearance is reserved between the outer peripheral wall of the second insertion part 130 and the inner wall of the traction rope channel 220. This clearance ensures that the second insertion part 130 does not generate additional expansion stress on the multi-cavity tube 200, maintaining the original outer diameter of the multi-cavity tube 200 and ensuring that the passage performance of the insertion part 20 is not affected. It also accommodates certain assembly tolerances during assembly, reducing the difficulty of assembling and aligning the guide element 100 and improving production assembly efficiency. At the same time, the guide cavity 131 can further limit the radial travel of the traction rope 101 near the end of the multi-cavity tube 200, reducing or avoiding radial swaying of the traction rope during operation, thereby improving the response accuracy and control consistency of the traction system. In other examples, the second insertion part 130 and the traction rope channel 220 can also be configured with an interference fit to enhance the structural stability between the guide element 100 and the multi-cavity tube 200.

[0025] In some embodiments, when multiple traction ropes 101 are provided in the endoscope, multiple guide channels 131 can be provided on the base 110, with each guide channel 131 corresponding to one of the traction ropes 101. Correspondingly, multiple second insertion portions 130 are connected to the base 110, with one second insertion portion 130 corresponding to one guide channel 131. In other embodiments, the component can be provided with multiple guide elements 100, with one second insertion portion 130 provided on each guide element 100, thereby reducing interference between the traction ropes 101 and improving the smoothness and control accuracy of the independent movement of each traction rope 101.

[0026] In some embodiments, to enhance the structural reinforcement and protection of the multi-lumen tube 200 by the guiding element 100, the base 110 may also be configured to abut against the proximal end of the multi-lumen tube 200 to disperse the stress between the traction rope 101 and the base 110, thereby effectively transferring the local load generated during traction to the overall structure of the multi-lumen tube 200 and avoiding stress concentration in the proximal region of the traction rope channel 220. The abutment surface between the base 110 and the proximal end of the multi-lumen tube 200 can be designed as an annular contact surface to increase the force-bearing area and further improve the uniformity of load distribution. In addition, the abutment fit between the base 110 and the proximal end face of the multi-lumen tube 200 can also coordinate with the fit between the first insertion part 120 and the working channel 210 to increase the resistance of the guiding element 100 to axial displacement, prevent it from gradually dislodging due to traction force during long-term use, ensure that the guiding cavity 131 is always in the preset position, and maintain the stability of the geometric relationship of the traction system. This structural design not only strengthens the overall rigidity of the proximal end of the multi-cavity tube 200, but also works with the first insertion part 120 and the second insertion part 130 to jointly construct a three-dimensional positioning system, significantly improving the anti-deflection capability and durability of the guiding element 100 under complex operating conditions.

[0027] In some embodiments, to achieve communication between the external interface 320 and the working channel 210, a communication hole 230 can be provided on the proximal peripheral wall of the multi-lumen tube 200, and a guide surface 121 can be provided at the distal end of the first insertion part 120. The guide surface 121 is correspondingly provided with the communication hole 230, and the guide surface 121 cooperates with the communication hole 230 to guide the medium in the working channel 210 to turn at the communication hole 230, so that the medium flowing into the external interface 320 can smoothly enter the interior of the working channel 210 along the guide surface 121, reducing or avoiding flow obstruction or pressure loss at the communication hole 230. This cooperative structure not only ensures the reliability of the sealed communication between the external interface 320 and the working channel 210, but also maximizes the effective flow area of ​​the working channel, avoiding the normal passage of the medium or instrument due to structural transition.

[0028] The endoscope provided in this application embodiment can be a duodenoscope, or a nephroscope, bronchoscope, suction endoscope, esophagoscope, gastroscope, colonoscope, otoscope, rhinoscope, oral endoscope, laryngoscope, colposcope, laparoscope, arthroscope, etc. This application embodiment does not specifically limit the type of endoscope.

[0029] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0030] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A guiding element for an endoscope, characterized in that, It includes a base and a first insertion part, the first insertion part being connected to the base. The first insertion part is used to pass through the working channel of the multi-cavity tube to achieve a sealed fit with the near port of the working channel. The base is provided with a guide cavity, which is used to pass through the traction rope to prevent the traction rope from directly contacting the near port of the traction rope channel of the multi-cavity tube.

2. A guiding element according to claim 1, characterized in that, The guiding element is made of a rigid material; And / or, the guiding element is a lubricating material or the guiding cavity is provided with a lubricating layer.

3. A guiding element according to claim 1, characterized in that, The distal end of the first insertion part is provided with a guide surface, which is used to guide the medium in the working channel to change direction.

4. A guiding element according to any one of claims 1 to 3, characterized in that, The guiding element further includes a second insertion part, which is used to pass through the traction rope channel of the multi-cavity tube, and the guiding cavity passes through the second insertion part axially. And / or, the base is provided with multiple guide channels; And / or, the guiding element includes a plurality of first insertion portions.

5. A guiding element according to claim 4, characterized in that, The guiding element is made of acetal steel. And / or, the base is also used to abut against the proximal end of the multi-lumen tube to distribute stress between the traction rope and the base.

6. An endoscope multi-lumen assembly, characterized in that, The device includes a multi-cavity tube and a guiding element as described in any one of claims 1 to 5. The multi-cavity tube is provided with a traction rope channel and a working channel. The base is located near the port of the multi-cavity tube, and the guiding cavity is correspondingly provided with the traction rope channel.

7. An endoscope multi-lumen assembly according to claim 6, characterized in that, A connecting hole is provided on the proximal peripheral wall of the multi-lumen tube, and a guide surface is provided on the distal end of the first insertion part. The guide surface is provided in correspondence with the connecting hole, and the guide surface cooperates with the connecting hole to guide the medium in the working channel to turn at the connecting hole.

8. An endoscope multi-lumen assembly according to claim 7, characterized in that, The component includes two guiding elements, and the multi-cavity tube includes two traction rope channels and two working channels, with one guiding element corresponding to one traction rope channel and one working channel; And / or, the component further includes an adapter body, which is provided with an assembly channel and two external interfaces. The multi-cavity tube passes through the assembly channel, and the external interfaces are connected to the assembly channel. The external interfaces are connected to the working channel through connecting holes, and the external interfaces are configured in a one-to-one correspondence with the working channels.

9. An endoscope, characterized in that, It includes a handle, an insertion part, and the components according to any one of claims 6 to 8, wherein the proximal end of the insertion part is connected to the distal end of the handle, the insertion part includes a catheter, and the multi-lumen tube is disposed within the catheter.

10. An endoscope according to claim 9, characterized in that, The multi-lumen tube includes two working channels, and the assembly also includes an adapter. The adapter is provided with an assembly channel and two external interfaces. The multi-lumen tube passes through the assembly channel, and the external interfaces are connected to the assembly channel. The external interfaces are connected to the working channels through connecting holes on the peripheral wall of the multi-lumen tube. The external interfaces and working channels are arranged in a one-to-one correspondence. One of the two external interfaces is used to insert an endoscope, and the other of the two external interfaces serves as an instrument channel interface.

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