Tube sheath and endoscope system

Abstract

The present application relates to the technical field of endoscopy, and particularly discloses a tube sheath and an endoscope system, the tube sheath comprising a tube sheath body, the tube sheath body having an axially-through first channel, and a second channel radially penetrating the tube sheath body and communicating with the first channel being arranged at the distal end of the tube sheath body; in the above scheme, in the insertion stage of the tube sheath body, the endoscope can clearly see the tissue structure and obstacles in front through the first channel, improving the visibility of the insertion process and reducing the risk of blind insertion, and after the tube sheath body reaches the target position, the endoscope can be retracted so that the front end thereof is located at the communication position of the first channel and the second channel, and then the endoscope is operated so that the front end thereof is bent and inserted into the second channel, based on the guiding effect of the second channel on the front end of the endoscope, so that the endoscope can accurately enter the common bile duct from the side of the tube sheath body, thereby avoiding the dependence of the endoscope on the duodenoscope when exploring the common bile duct, and reducing the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of endoscopy, in particular to a tube sheath and an endoscope system. BACKGROUND

[0002] Cholangiolithiasis, stricture and tumor of biliopancreatic system diseases are common clinical diseases. With the development of endoscopy, the combination of duodenoscope and choledochoscope has become the core solution of minimally invasive treatment. After the duodenoscope completes intubation, it is kept stable in the ampulla position, and the choledochoscope is slowly sent into the common bile duct through the working channel of the duodenoscope until the target position (such as intrahepatic bile duct branches) to perform laser lithotripsy, biopsy sampling and other surgical operations.

[0003] However, the current clinical solution of using duodenoscope and choledochoscope together can realize minimally invasive diagnosis and treatment of bile duct, but still faces the significant defect of high equipment and operation cost. Therefore, providing a solution that can cooperate with the choledochoscope and significantly reduce the cost of diagnosis and treatment is a technical problem to be solved by those skilled in the art. SUMMARY

[0004] The present application discloses a tube sheath and an endoscope system to solve the above technical problems in the related art.

[0005] To solve the above problems, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a tube sheath, which comprises a tube sheath body, the tube sheath body having a first channel passing through in the axial direction thereof, the tube sheath body further being provided with a second channel, the second channel being distributed at the distal end of the tube sheath body, one end of the second channel being connected with the first channel, and the other end of the second channel radially penetrating the tube sheath body.

[0007] Further, the second channel extends linearly, the second channel having a first included angle with the first direction, the first included angle being less than or equal to 90°, and the first direction being the extension direction of the tube sheath body from the proximal end thereof to the distal end thereof; or, the second channel extends in an arc shape, and the tangent direction at the distal end of the second channel has a second included angle with the first direction, the second included angle being less than 90°, and the first direction being the extension direction of the tube sheath body from the proximal end thereof to the distal end thereof.

[0008] Further, the tube sheath body is arc-shaped at the connection between the first channel and the second channel.

[0009] Further, along a radial direction of the tube sheath body, the tube sheath body has a first portion and a second portion distributed on two sides of the first channel, the second channel is arranged in the second portion, and a thickness of the second portion at a communication between the first channel and the second channel is greater than a thickness of the first portion.

[0010] Further, the thickness of the second portion at the communication between the first channel and the second channel is greater than a thickness of a portion of the second portion distributed proximally to the communication.

[0011] Further, the tube sheath further comprises a guide tube, and a distal end of the guide tube has a curved segment.

[0012] Optionally, the curved segment is pre-bent, and when the curved segment is located at the communication between the first channel and the second channel, the curved segment is bent towards the second channel to explore into the second channel.

[0013] Optionally, the curved segment is connected with a traction member configured to pull the curved segment to bend, so that the curved segment is located in the first channel or explores into the second channel.

[0014] Further, along the first direction, a diameter of the guide tube gradually decreases, and the first direction is an extension direction of the tube sheath body from a proximal end to a distal end thereof.

[0015] Further, the tube sheath further comprises a tube sheath base, and the tube sheath base comprises a base and a movable part slidingly arranged on the base, the proximal end of the tube sheath body is connected with the base, and the guide tube is connected with the movable part.

[0016] Further, the movable part is further provided with a knob, and the knob is in transmission connection with the curved segment through the traction member to control the bending of the curved segment.

[0017] In a second aspect, the application further provides an endoscope system, and the endoscope system comprises an endoscope and the tube sheath as described above, and an insertion part of the endoscope explores into the first channel or the second channel.

[0018] The technical solution adopted by the application can achieve the following beneficial effects:

[0019] The tube sheath and endoscope system of the present application, the endoscope can be pre-positioned in the first channel, and the front end of the endoscope exceeds the communication of the first channel and the second channel, in the stage of inserting the tube sheath body into the body cavity, the bending posture of the endoscope is consistent with the bending posture of the tube sheath body, the endoscope can clearly see the tissue structure and obstacles in front of the body cavity through the first channel, improve the visibility of the tube sheath body in the insertion process, reduce the risk of blind insertion; and after the tube sheath body reaches the target position, the endoscope can be retracted so that the front end thereof is located at the communication of the first channel and the second channel, and then the endoscope is operated to probe into the second channel, based on the guiding effect of the second channel on the front end of the endoscope, so as to ensure that the endoscope can accurately enter the common bile duct from the side of the tube sheath body, at the same time, the tube sheath body can also provide stable support performance for the endoscope, which can effectively avoid the influence of frequent intestinal cavity peristalsis on the endoscope, this way avoids the dependence of the endoscope on the duodenoscope when probing into the common bile duct, while ensuring the operation safety and accuracy, greatly reduces the application cost of the endoscope system. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative effort.

[0021] Figure 1 is a structure schematic diagram of the tube sheath of the present application embodiment;

[0022] Figure 2 is one of the cross-sectional schematic diagrams of the tube sheath of the present application embodiment;

[0023] Figure 3 is the second cross-sectional schematic diagram of the tube sheath of the present application embodiment;

[0024] Figure 4 is Figure 3 is a local enlarged schematic diagram of A in the above;

[0025] Figure 5 is the third cross-sectional schematic diagram of the tube sheath of the present application embodiment;

[0026] Figure 6 is Figure 5 is a local enlarged schematic diagram of B in the above;

[0027] Figure 7 is the fourth cross-sectional schematic diagram of the tube sheath of the present application embodiment;

[0028] Figure 8 is Figure 7A local enlarged view at C;

[0029] Figure 9 Fig. 1 is a schematic view of an endoscope system according to an embodiment of the present application.

[0030] Fig. 1 is a schematic view of an endoscope system according to an embodiment of the present application.

[0031] 100, tube sheath body; 101, first part; 102, second part; 110, first channel; 120, second channel; 200, guide tube; 210, curved section; 300, tube sheath seat; 310, base; 320, movable part; 330, knob; 400, biliary sonde. DETAILED DESCRIPTION

[0032] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second" and the like are generally of a kind, and are not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0034] In the diagnosis and treatment process of biliopancreatic system diseases, the biliary sonde is usually used in combination with the duodenoscope to form a mother-son mirror system. After the duodenoscope completes intubation, it is kept stable in the ampulla position, and the biliary sonde is slowly sent into the common bile duct through the working channel of the duodenoscope until the target position, that is, the duodenoscope is a "portal tool" for the treatment of biliopancreatic system diseases, which can position the ampulla and the interventional operation of the main bile duct, and at the same time, the duodenoscope can also provide stable channel support for the biliary sonde, avoid the biliary sonde from coming out due to frequent duodenal peristalsis, and eliminate the influence of intestinal cavity movement on the operation of the biliary sonde.

[0035] However, since the duodenoscope is integrated with a side-view optical system, a mechanical structure of a lifting forceps device, and a multi-channel design, the equipment cost is high, and since the internal structure of the duodenoscope is complex (including a lifting forceps cavity, a biopsy channel, etc.), the maintenance and application cost of the duodenoscope is further increased, and repeated high-temperature and high-pressure disinfection in the use process causes the sealing performance of the duodenoscope to decrease, which has a relatively serious influence on the service life of the duodenoscope.

[0036] Based on the above situation, the embodiments of the present application disclose a tube sheath and an endoscope system, and the following will be specifically described in combination with the accompanying drawings Figures 1 to 9 The tube sheath and the endoscope system provided by the embodiments of the present application are described in detail through specific embodiments and application scenarios.

[0037] Please refer to Figure 1 and Figure 2 The embodiments of the present application disclose a tube sheath, and the disclosed tube sheath can be used in combination with an endoscope (for example, a biliary tract sonoscope) to be applied to the diagnosis and treatment of diseases of the biliary and pancreatic system. Specifically, in the embodiments of the present application, the disclosed tube sheath includes a tube sheath body 100, the tube sheath body 100 is in a tubular structure, has a first channel 110 penetrating through the tube sheath body 100 in the axial direction, and the tube sheath body 100 is further provided with a second channel 120 at the distal end thereof, one end of the second channel 120 is communicated with the first channel 110, and the other end of the second channel 120 penetrates through the annular wall of the tube sheath body 100 in the radial direction.

[0038] Based on the technical solution, when the tube sheath is used in cooperation with an endoscope (for example, a biliary sonde) to diagnose and treat diseases of the biliary and pancreatic system, the insertion part of the biliary sonde can be first placed in the first channel 110, and the distal end of the insertion part exceeds the connection between the first channel 110 and the second channel 120. During the process of inserting the tube sheath body 100 into the body cavity, the biliary sonde can clearly see the tissue structure and obstacles in front of the body cavity through the first channel 110, thereby improving the visibility of the tube sheath body 100 during the insertion process, assisting the operator to push the tube sheath body 100 to the target position, and reducing the risk of blind insertion. After the tube sheath body 100 reaches the target position, the endoscope can be retracted, so that the distal end of the insertion part is retracted to the connection between the first channel 110 and the second channel 120, and then the biliary sonde is operated to make the distal end of the insertion part of the biliary sonde probe into the second channel 120. Based on the guiding effect of the second channel 120 on the distal end of the biliary sonde, it is ensured that the insertion part of the biliary sonde can accurately enter the common bile duct from the side of the tube sheath body 100, and the tube sheath body 100 can also provide stable support for the biliary sonde, thereby effectively avoiding the risk of the biliary sonde being pulled out due to frequent intestinal peristalsis. That is to say, by providing the first channel 110 and the second channel 120 that are connected on the tube sheath body 100, the biliary sonde can be switched between forward viewing and side viewing, and when the biliary sonde probes into the common bile duct through the second channel 120, the tube sheath body 100 can also provide stable support for the biliary sonde. This way avoids the dependence of the biliary sonde on the duodenoscope when probing into the common bile duct, that is, the application of the duodenoscope is avoided, thereby greatly reducing the cost of diagnosis and treatment of diseases of the biliary and pancreatic system while ensuring the safety and accuracy of the operation.

[0039] It can be understood that in the present application, when the biliary sonde probes into the common bile duct through the second channel 120, the tube sheath body 100 can provide stable support for the biliary sonde, so the tube sheath body 100 needs to be relatively fixed after reaching the target position. For example, the operator can hold the rear end of the tube sheath to keep the tube sheath body 100 relatively fixed after reaching the target position; or before the withdrawal action of the biliary sonde, the distal end of the tube sheath body 100 can be bent to form a C-shaped or J-shaped structure through the bending action of the biliary sonde, thereby forming a geometric occlusion with the inner wall of the intestinal tract, so that the tube sheath body 100 is relatively fixed after reaching the target position, thereby providing stable support for the biliary sonde.

[0040] In some embodiments of the present application, a transparent glass sheet is further provided at the distal end of the first channel 110. When the distal end of the biliary sonde is located in the first channel 110, the biliary sonde can realize forward viewing through the transparent glass sheet, and the transparent glass sheet can also ensure the sealing of the first channel 110, thereby preventing the backflow of bile or blood into the tube sheath, and effectively avoiding the risk of cross infection.

[0041] From the foregoing, the biliary tract sonography needs to be inserted into the common bile duct through the second channel 120, therefore, the second channel 120 in the application is not closed, in a preferred embodiment, the tube sheath body 100 is provided with a valve in the second channel 120, the valve can play a certain physical shielding effect, avoiding the flow of bile and other tissue fluids or blood into the tube sheath body 100, and when the biliary tract sonography is inserted into the second channel 120, it can also pass through the valve and smoothly enter the common bile duct.

[0042] In some embodiments of the application, the second channel 120 can extend linearly, the second channel 120 has a first included angle with the first direction, the first included angle is less than 90°, and the first included angle is preferably within the range of 30°-60°. If the first included angle is too large, the biliary tract sonography needs to be bent at a large angle during the process of inserting the biliary tract sonography into the second channel 120, which has the problem of large resistance during the process of pushing the biliary tract sonography, which is not conducive to smoothly pushing the biliary tract sonography into the common bile duct; and if the first included angle is small, due to the limitation of the radial size and wall thickness of the tube sheath body 100, the distal end of the biliary tract sonography is difficult to reach the bending amplitude that matches the entrance of the common bile duct, which also increases the difficulty of inserting the biliary tract sonography.

[0043] In the embodiments of the application, please refer to Figure 2 , the second channel 120 extends in an arc shape, so that when the insertion part of the biliary tract sonography is bent and pushed into the second channel 120, the shape of the insertion part in the bent state matches the second channel 120, the arc-shaped design makes the biliary tract sonography more smoothly advance along the curved shape of the second channel 120 during the pushing process, reduces the frictional resistance generated during the pushing process, and helps the operator to operate the biliary tract sonography more easily during the operation process, improving the work efficiency.

[0044] In further technical solutions, please refer to Figure 2 , Figure 3 and Figure 4 , the tangent direction of the arc-shaped second channel 120 at the distal end has a second included angle with the first direction, and the second included angle is less than or equal to 90°, so that the biliary tract sonography can be directed forward or sideways when it just exits the second channel 120, and the biliary tract sonography can be controlled to further bend the insertion part when it exits the second channel 120, and the distal end of the biliary tract sonography can be directed backward, so that the distal end of the biliary tract sonography has a large angle adjustment range after exiting the second channel 120, so that the biliary tract sonography can more accurately find the entrance position of the common bile duct within a large angle adjustment range, improving the convenience of inserting the biliary tract sonography into the common bile duct.

[0045] In further technical solutions, please refer toFigure 4 The tube sheath body 100 is arc-shaped at the communication position of the first channel 110 and the second channel 120, and when the operator bends the biliary sonoscope to explore into the second channel 120, the biliary sonoscope will be rubbed and pressed by the inner wall of the tube sheath body 100. The arc-shaped transition design can disperse the friction and pressing force, reduce the impact and abrasion of the inner wall of the tube sheath body 100 on the biliary sonoscope, thereby protecting the biliary sonoscope from damage and prolonging the service life thereof.

[0046] In some embodiments of the present application, the wall thickness of the tube sheath body 100 can be uniform along the circumferential direction of the tube sheath body 100, thereby improving the convenience of manufacturing the tube sheath body 100 and effectively reducing the production cost of the tube sheath body 100.

[0047] In some other embodiments of the present application, the wall thickness of the tube sheath body 100 can also be different along the circumferential direction of the tube sheath body 100. Specifically, please refer to Figure 2 , Figure 3 and Figure 4 The tube sheath body 100 has a first portion 101 and a second portion 102 distributed on both sides of the first channel 110 along the radial direction of the tube sheath body 100, that is, the first portion 101 and the second portion 102 are radially opposite, the second channel 120 is arranged in the second portion 102, and the thickness of the second portion 102 is greater than that of the first portion 101 at the communication position of the first channel 110 and the second channel 120. In this way, when the biliary sonoscope is bent to explore into the second channel 120, the biliary sonoscope will generate a significant pressing force on the tube sheath body 100. Through the thickening design of the second portion 102, the structural strength of the tube sheath body 100 at the communication position of the first channel 110 and the second channel 120 can be increased, thereby avoiding the biliary sonoscope from forcing the tube sheath body 100 to bend and collapse when the biliary sonoscope is bent to explore into the second channel 120 or the common bile duct, and thereby ensuring the stability of the tube sheath body 100 in supporting the biliary sonoscope.

[0048] In further technical solutions, please refer to Figure 7 and Figure 8 The thickness of the second portion 102 at the communication position of the first channel 110 and the second channel 120 is greater than the thickness of the proximal portion of the second portion 102 distributed at the communication position, that is, along the aforementioned first direction, the first channel 110 is not of equal diameter, and the diameter of the first channel 110 at the proximal portion is smaller than that at the communication position. When the biliary sonoscope is pushed or withdrawn in the first channel 110 and / or the second channel 120, the friction contact area between the biliary sonoscope and the tube sheath body 100 can be reduced, thereby ensuring the smoothness of pushing or withdrawing the biliary sonoscope.

[0049] In the preferred embodiment, the caliber of the first channel 110 at the communication is matched with the diameter of the choledochoscope, so that when the choledochoscope is inserted into the common bile duct, the matching feature can reduce the shaking of the distal end of the choledochoscope, and facilitate the accurate operation of the choledochoscope, thereby ensuring the certainty of the support of the tube sheath body 100 to the choledochoscope.

[0050] It should be noted that in the embodiments of the present application, the caliber of the first channel 110 distributed at the proximal end portion of the communication is smaller than the caliber of the first channel 110 at the communication. The caliber change in the first direction can be gradual or segmented, and the present application does not make specific limitations thereon. In the preferred embodiment, the caliber change of the first channel 110 in the first direction is gradual, and with such a setting, compared with the segmented caliber change, the gradual caliber change can avoid the formation of a step surface, thereby ensuring the smoothness of the placement of the choledochoscope.

[0051] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 , the tube sheath can further include a guide tube 200 movably arranged in the tube sheath body 100, and the distal end of the guide tube 200 is provided with a curved section 210 which can be inserted into the second channel 120, thereby guiding the lateral exploration of the choledochoscope from the second channel 120.

[0052] In some embodiments of the present application, the curved section 210 can be pre-bent. For example, the curved section 210 of the guide tube 200 can be made of a shape memory alloy, and in the natural state, the curved section 210 is in a curved posture relative to the entire guide tube 200. In the initial state, the guide tube 200 is arranged in the first channel 110, and the distal end of the guide tube 200 exceeds the communication between the first channel 110 and the second channel 120. At this time, the choledochoscope is in the guide tube 200 and observes the front of the tube sheath body 100, and when the choledochoscope needs to be laterally inserted into the common bile duct, the operator can retract the guide tube 200. When the head end of the guide tube 200 is located at the communication between the first channel 110 and the second channel 120, the curved section 210 of the guide tube 200 can automatically bend into the second channel 120, and the operator can then push the guide tube 200. At this time, the choledochoscope in the guide tube 200 can naturally be inserted into the second channel 120 and can be further pushed out.

[0053] It can be understood that in the case where the curved section 210 of the guide tube 200 is pre-bent, when the distal end of the guide tube 200 exceeds the communication and is pre-arranged in the first channel 110, artificial assistance is needed to constrain the curved section 210 to avoid the automatic entry of the curved section 210 into the second channel 120 during the placement of the guide tube 200.

[0054] In some other embodiments of the present application, the bending section 210 can also be actively bent by manual operation. For example, the bending section 210 is connected with a traction member, which can be a traction rope. The distal end of the traction rope is connected to the side of the bending section 210 facing the second channel 120. An operator can pull the traction member to make the bending section 210 probe into the second channel 120, thereby guiding the biliary sonde. Details are not described herein.

[0055] As described above, the caliber of the first channel 110 can be gradually changed along the first direction. Based on this, in some embodiments of the present application, the caliber of the guide tube 200 is gradually changed along the first direction. This can improve the convenience of inserting the guide tube 200 into the first channel 110. After the operator performs the retreat and push actions in sequence, the guide tube 200 can have a better fit with the gradually changed first channel 110, which can avoid the guide tube 200 from jumping to the distal end, thereby ensuring the accuracy and stability during the operation of the biliary sonde.

[0056] Please refer to Figure 1 and Figure 9 The tube sheath of the embodiments of the present application can also include a tube sheath base 300, which includes a base 310 and a movable part 320 slidingly arranged on the base 310. In the case where the tube sheath includes the guide tube 200, the proximal end of the tube sheath body 100 is connected with the base 310, and the proximal end of the guide tube 200 is connected with the movable part 320. By sliding the movable part 320 to move relative to the base 310, the push and retreat of the guide tube 200 in the tube sheath body 100 can be realized.

[0057] In further technical solutions, in the case where the tube sheath includes the guide tube 200 and the bending section 210 of the guide tube 200 needs to be actively bent by manual control, a knob 330 is further arranged on the movable part 320. The distal end of the traction member described above is connected with the bending section 210, and the proximal end of the traction member is in transmission connection with the knob 330. By rotating the knob 330, the bending of the bending section 210 can be realized. For example, a traction wheel coaxially connected with the knob 330 is arranged in the movable part 320, and the proximal end of the traction member is fixedly connected with the traction wheel.

[0058] The embodiments of the present application also disclose an endoscope system. The disclosed endoscope system includes an endoscope and the tube sheath described above. The insertion part of the endoscope probes into the first channel 110 or the second channel 120.

[0059] It should be noted that, in the present document, the terms "comprising", "comprises" or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element. Also, it is to be noted that the scope of the methods and apparatus of this application are not limited by the order of the steps or the sequence for performing the steps, as some steps can occur in different order or concurrently, and some steps can be skipped or added, such as described in alternative examples. Also, features described in relation to certain examples can be combined in other examples.

[0060] The above description is only specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered by the protection scope of the present application.

Claims

1. A tube sheath characterized by, The tube sheath body (100) has a first channel (110) extending through the tube sheath body (100) in the axial direction, and the tube sheath body (100) is further provided with a second channel (120) distributed at the distal end of the tube sheath body (100), one end of the second channel (120) is connected with the first channel (110), the other end of the second channel (120) penetrates the tube sheath body (100) in the radial direction, the second channel (120) extends in an arc shape, and the tangent direction at the distal end of the second channel (120) has a second included angle with the first direction, the second included angle is less than or equal to 90°, and the first direction is the extension direction of the tube sheath body (100) from the proximal end to the distal end. The distal end of the guide tube (200) has a curved section (210), the curved section (210) is pre-bent, when the curved section (210) is located at the communication position of the first channel (110) and the second channel (120), the curved section (210) is bent to the second channel (120) to explore into the second channel (120); or the distal end of the guide tube (200) has a curved section (210), the curved section (210) is connected with a traction member, the traction member is configured to bend the curved section (210), so that the curved section (210) is located in the first channel (110) or explores into the second channel (120). In the first direction, the diameter of the guide tube (200) gradually decreases, and the first direction is the extension direction of the tube sheath body (100) from the proximal end to the distal end. In the radial direction of the tube sheath body (100), the tube sheath body (100) has a first part (101) and a second part (102) distributed on both sides of the first channel (110), the second channel (120) is arranged in the second part (102), and the thickness of the second part (102) is greater than the thickness of the first part (101) at the communication position of the first channel (110) and the second channel (120).

2. The tube sheath of claim 1, wherein, The tube sheath body (100) is arc-shaped at the communication position of the first channel (110) and the second channel (120).

3. The tube sheath of claim 1, wherein, The thickness of the second part (102) at the communication position of the first channel (110) and the second channel (120) is greater than the thickness of the proximal end portion of the second part (102) distributed at the communication position.

4. The sheath of any of claims 1-3, wherein, The tube sheath seat (300) includes a base (310) and a movable part (320) slidingly arranged on the base (310), the proximal end of the tube sheath body (100) is connected with the base (310), and the guide tube (200) is connected with the movable part (320).

5. The tube sheath of claim 4, wherein, A knob (330) is further arranged on the movable part (320), and the knob (330) is in transmission connection with the bending section (210) through the traction member to control bending of the bending section (210).

6. An endoscope system characterized by comprising: The endoscope is inserted into the first channel (110) or the second channel (120).

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