Channel assembly, endoscope and assembly method

Abstract

The application relates to the technical field of endoscopes, in particular to a channel assembly, an endoscope and an assembling method. The channel assembly comprises a channel joint, a middle sleeve and an instrument tube. The distal end port of the channel joint is provided with a mounting groove. The middle sleeve is made of flexible material, and the middle sleeve is provided with a spiral groove in the axial direction. The spiral groove penetrates through the middle sleeve in the radial direction. The proximal end of the instrument tube passes through the middle sleeve and is arranged in the mounting groove. The outer peripheral wall of the instrument tube is expanded and connected with the inner peripheral wall of the mounting groove through the middle sleeve, so that coaxial connection of the channel joint and the proximal end of the instrument tube is realized. The middle sleeve with the spiral structure is used for coaxially butting the channel joint and the instrument tube, the end face gap between the channel joint and the instrument tube is eliminated, sufficient glue liquid storage space is reserved, the effective glue bonding area among the instrument tube, the middle sleeve and the channel joint is improved, the fault tolerance of the whole assembling process is improved, the operation requirement of the assembling personnel is reduced, and the production quality and production efficiency of the endoscope product are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of endoscopy technology, and more particularly to a channel assembly, an endoscope, and an assembly method. Background Technology

[0002] An endoscope is a medical device that allows direct access to human cavities for examination, providing doctors with comprehensive diagnostic information. An endoscope typically includes: an insertion section for insertion into the body, a handle for controlling the bending of the insertion section's tip, and a display device for visualizing the internal environment of the body's natural cavities. Through the coordination of these three parts, the endoscope enables visualization of the body's interior, exploration of lesions, and treatment. The handle has a channel connector that communicates with the instrument channel within the insertion section. During examinations using the endoscope, surgical instruments can be inserted through the channel connector and extended from the distal end of the insertion section via the instrument channel, allowing the instruments to directly reach the cavity for manipulation. Alternatively, the channel connector can be connected to positive or negative pressure, allowing for the injection of media or aspiration of samples into the cavity through the instrument channel.

[0003] In the production and use of endoscopes, the quality and efficiency of the installation of the channel connector and instrument tube have a significant impact on the production and use of endoscopes. In the process of realizing this invention, the applicant discovered that the assembly efficiency is low due to the limitations of the connection structure between the channel connector and the instrument tube. Summary of the Invention

[0004] The purpose of this application is to provide a channel assembly, endoscope, and assembly method to solve the aforementioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] In a first aspect, this application provides a channel assembly for use in an endoscope, comprising:

[0007] A channel connector, wherein a mounting groove is provided on the distal port of the channel connector;

[0008] The intermediate sleeve is made of flexible material and has a spiral groove along the axial direction, which penetrates the intermediate sleeve radially.

[0009] The instrument tube has its proximal end passing through an intermediate sleeve and positioned within the mounting groove. The outer peripheral wall of the instrument tube is expanded to the inner peripheral wall of the mounting groove via the intermediate sleeve, thereby achieving a coaxial connection between the channel connector and the proximal end of the instrument tube.

[0010] Secondly, this application provides an endoscope including a handle, an insertion part, and a channel assembly as described above, wherein the proximal end of the insertion part is connected to the distal end of the handle, the channel connector is disposed on the handle, and the distal end of the instrument tube is disposed within the insertion part.

[0011] Thirdly, this application provides a method for assembling the channel assembly or endoscope described above, comprising the following steps:

[0012] Insert the near end of the intermediate sleeve into the mounting groove;

[0013] Insert the proximal end of the instrument tube into the intermediate cannula from the distal end of the intermediate cannula;

[0014] The proximal end of the instrument tube is brought into contact with the proximal end wall of the mounting slot.

[0015] The technical solution provided in this application can achieve the following beneficial effects:

[0016] This application uses a spiral-structured intermediate sleeve to coaxially connect the channel connector and the instrument tube, eliminating the end face gap between the channel connector and the instrument tube. It retains ample space for adhesive retention to increase the effective bonding area between the instrument tube, intermediate sleeve, and channel connector, thereby improving the fault tolerance of the entire assembly process. The entire assembly operation is simple, the assembly quality is stable, and it eliminates the delicate work of inserting the mandrel into the instrument tube, reducing the operational requirements for assembly personnel and effectively improving the production quality and efficiency of endoscope products. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the endoscope in this application;

[0019] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0020] Figure 3 This is a schematic diagram of the channel component of this application;

[0021] Figure 4 This is a schematic diagram of the structure of the channel components before assembly in this application;

[0022] Figure 5 This is a schematic diagram of the internal structure of the channel component after assembly in this application;

[0023] Figure 6 This is a sectional view of the pipe fitting in this application;

[0024] Figure 7 This is a schematic diagram of the structure of the intermediate sleeve in this application;

[0025] Figure 8 This is a cross-sectional view of the intermediate sleeve of the present invention;

[0026] Figure 9 This is a schematic diagram of the channel assembly of the present invention during bonding.

[0027] In the picture:

[0028] 10. Handle; 20. Insertion part; 100. Channel connector; 110. Mounting groove; 120. First through hole; 130. Second through hole; 200. Instrument tube; 300. Intermediate sleeve; 310. Spiral groove; 311. Guide slope; 312. Transition fillet; 320. Stop part. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0030] 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.

[0031] 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".

[0032] To improve the assembly quality between the endoscope's access connector and instrument tube, especially for nephroscopes, where guidewires may be inserted backwards (i.e., the guidewire enters from the instrument tube port at the distal end of the endoscope insertion section and exits through the access connector on the handle), gaps or steps in the connection between the access connector and the instrument tube increase the difficulty of guidewire passage, and similar issues arise when inserting surgical instruments. Therefore, gaps and steps between the access connector and the instrument tube need to be eliminated during the manufacturing process. In existing technologies, a mandrel is generally used to assist in the connection and installation between the access connector and the instrument tube. However, when using the sampling mandrel, a greater insertion depth into the instrument tube increases the risk of instrument tube damage, while a shallow insertion results in an unstable connection, making it easy for the mandrel to detach from the instrument tube when the end face of the instrument tube is aligned with the instrument connector. This necessitates re-inserting the mandrel into the instrument tube, reducing assembly efficiency and increasing the operational requirements for assembly personnel.

[0033] In view of this, this application provides a channel assembly, an endoscope, and an assembly method. The channel connector and the instrument tube are coaxially connected through a spiral intermediate sleeve, eliminating the end face gap between the channel connector and the instrument tube. Then, the connection is bonded and cured. The entire assembly process is highly fault-tolerant, simple to operate, and has stable assembly quality. It eliminates the delicate work of inserting the mandrel into the instrument tube and reduces the operational requirements for assembly personnel, thereby effectively improving product production quality and production efficiency, as detailed in the following embodiments.

[0034] Example 1

[0035] This embodiment provides a channel assembly for use in an endoscope, such as... Figures 1-5 As shown, it includes:

[0036] The channel connector 100 has a mounting groove 110 on its distal port; the proximal end of the channel connector 100 can be a multi-channel structure with or without a cover, or a single-channel structure with or without a cover.

[0037] The intermediate sleeve 300 is made of flexible material and can deform after being squeezed. The intermediate sleeve 300 is provided with a spiral groove 310 along the axial direction and the spiral groove 310 penetrates the intermediate sleeve 300 radially.

[0038] The instrument tube 200 has its proximal end passing through the intermediate sleeve 300 and located in the mounting groove 110. The outer peripheral wall of the proximal end of the instrument tube 200 is expanded to the inner peripheral wall of the mounting groove 110 through the intermediate sleeve 300, so as to achieve the coaxial connection between the channel connector 100 and the proximal end of the instrument tube 200, forming an instrument channel. The instrument channel is used to pass at least one of surgical instruments, perfusion media, body fluids and samples. During installation, the intermediate sleeve 300 is first inserted into the mounting groove 110, and then the proximal end of the instrument tube 200 is inserted into the intermediate sleeve 300. During insertion, the outer peripheral wall of the instrument tube 200 and the inner peripheral wall of the mounting groove 110 cooperate to radially compress the intermediate sleeve 300, which is then fed back to the instrument tube 200, causing the instrument tube 200, intermediate sleeve 300, and mounting groove 110 to remain coaxial. At the same time, the spiral groove 310 absorbs the radial deformation of the intermediate sleeve 300, preventing damage to the instrument tube 200 or mounting groove 110 due to excessive pressure. Furthermore, as the instrument tube 200 penetrates into the proximal end of the channel connector 100, the spiral groove 310 penetrating the intermediate sleeve 300 also causes a certain amount of axial deformation in the intermediate sleeve 300. This axial deformation not only increases the width of the spiral groove 310, preventing the spiral groove 310 from absorbing the radial deformation of the intermediate sleeve 300, but also... The radial deformation of 00 disappears, and a gap is provided for the adhesive to remain, increasing the effective bonding area between the instrument tube 200, the intermediate sleeve 300, and the mounting groove 110. It also changes the frictional resistance between the instrument tube 200 and the intermediate sleeve 300, and between the intermediate sleeve 300 and the mounting groove 110, from full-section static frictional resistance to partial sliding frictional resistance and partial static frictional resistance. This reduces the insertion resistance of the instrument tube 200, lowers the assembly difficulty, and eliminates the delicate operation of inserting the mandrel into the instrument tube 200 compared to existing technologies, reducing the operational requirements for assembly personnel and effectively improving product production quality and efficiency. After the instrument tube 200 is inserted into place, the connection between the instrument tube 200, the intermediate sleeve 300, and the mounting groove 110 can be bonded and cured, effectively eliminating the connection gap and step between the instrument tube 200 and the channel connector 100, ensuring the quality of product assembly.

[0039] In some embodiments, to achieve the expansion connection between the proximal outer peripheral wall of the instrument tube 200 and the inner peripheral wall of the mounting groove 110 through the intermediate sleeve 300, the proximal outer diameter of the instrument tube 200 and the inner diameter of the mounting groove 110 can be configured to have a difference, the difference being less than the thickness of the intermediate sleeve 300. Specifically, the proximal outer diameter of the instrument tube 200 can be greater than the inner diameter of the intermediate sleeve 300, and the outer diameter of the intermediate sleeve 300 can be greater than the inner diameter of the mounting groove 110; alternatively, the proximal outer diameter of the instrument tube 200 can be greater than the inner diameter of the intermediate sleeve 300, and the outer diameter of the intermediate sleeve 300 can be equal to the inner diameter of the mounting groove 110; alternatively, the proximal outer diameter of the instrument tube 200 can be greater than the inner diameter of the intermediate sleeve 300, and the outer diameter of the intermediate sleeve 300 can be less than the inner diameter of the mounting groove 110; alternatively, the proximal outer diameter of the instrument tube 200 can be less than the inner diameter of the intermediate sleeve 300, and the outer diameter of the intermediate sleeve 300 can be greater than the inner diameter of the mounting groove 110.

[0040] In some embodiments, to reduce the resistance when the instrument tube 200 is inserted into the intermediate sleeve 300, such as Figure 8 As shown, a guide slope 311 can be provided at the bottom of the spiral groove 310 to avoid increasing the insertion resistance of the instrument tube 200 due to the end abutting against the inner wall of the bottom of the spiral groove 310. The guide slope 311 corrects the insertion direction of the instrument tube 200 during the insertion process, so as to keep the instrument tube 200 and the intermediate sleeve 300 coaxially inserted, reducing the difficulty of installing the channel connector 100 and the instrument tube 200.

[0041] In some embodiments, such as Figure 8 As shown, in order to reduce the installation resistance between the instrument tube 200 and the channel connector 100, the groove opening of the spiral groove 310 can be set as a transition fillet 312, thereby reducing the contact area between the intermediate sleeve 300 and the inner wall of the mounting groove 110, thus reducing the frictional resistance between the intermediate sleeve 300 and the inner wall of the mounting groove 110, and improving the ease of docking and installation between the instrument tube 200, the intermediate sleeve 300 and the channel connector 100.

[0042] In some embodiments, to facilitate axial deformation of the spiral groove 310 region on the intermediate sleeve 300 during installation, such as... Figure 9 As shown, the axial length of the intermediate sleeve 300 can be set to be less than the axial length of the mounting groove 110. When the intermediate sleeve 300 is inserted into the mounting groove 110, there is a gap between the proximal end of the intermediate sleeve 300 and the proximal end wall of the mounting groove 110. This gap can provide deformation space for the axial deformation of the intermediate sleeve 300 during the process of the instrument tube 200 being inserted into the intermediate sleeve 300, so as to ensure that the width of the spiral groove 310 remains approximately unchanged, slightly decreases, or slightly increases. Specifically, the axial length of the intermediate sleeve 300 and the axial length of the mounting groove 110 can be designed according to the actual situation.

[0043] In some embodiments, the axial length of the intermediate sleeve 300 can be set to be equal to or greater than the axial length of the mounting groove 110. Based on this structural design, when assembling the instrument tube 200 and the channel connector 100, the intermediate sleeve 300 can be first fitted onto the proximal end of the instrument tube 200, and then the instrument tube 200 and the intermediate sleeve 300 can be simultaneously installed into the mounting groove 110 of the channel connector 100. During the installation process, the outer peripheral wall of the instrument tube 200 and the inner peripheral wall of the channel connector 100 cooperate to compress and deform the intermediate sleeve 300, so that the instrument tube 200 and the mounting groove 110 are installed coaxially. The spiral groove 310 area of ​​the intermediate sleeve 300 will undergo axial deformation towards the distal end of the instrument tube 200 under frictional force, thereby reducing frictional resistance and leaving sufficient groove width of the spiral groove 310 to accommodate the adhesive, so as to increase the effective bonding area between the instrument tube 200, the intermediate sleeve 300 and the mounting groove 110. It should be noted that the adhesive can be applied to the outer peripheral wall and spiral groove of the intermediate sleeve 300 after it is fitted onto the proximal end of the instrument tube 200, or it can be introduced into the spiral groove 310 for bonding and fixing after the instrument tube 200 is fully inserted into the mounting groove 110. For bonding and fixing, a light-curing process can be used to shorten the bonding and fixing time.

[0044] In some embodiments, such as Figure 7 As shown, when the axial length of the intermediate sleeve 300 is less than the axial length of the mounting groove 110, a stop portion 320 can be provided at the distal end of the intermediate sleeve 300. The stop portion 320 is used to abut against the distal end face of the channel connector 100. Based on the above structure, when assembling the instrument tube 200 and the channel connector 100, the intermediate sleeve 300 is first inserted into the mounting groove 110, allowing the stop portion 320 to abut against the distal end face of the channel connector 100, and then the proximal end of the instrument tube 200 is inserted into the intermediate sleeve 300. In the sleeve 300, the stop portion 320 abuts against the distal end face of the channel connector 100, causing the distal end of the intermediate sleeve 300 and the distal end of the mounting groove 110 to be relatively fixed during assembly. The proximal end of the intermediate sleeve 300 undergoes axial deformation towards the proximal end of the mounting groove 110, allowing the intermediate sleeve 300 to continuously engage with the mounting groove 110 to ensure the coaxial insertion of the instrument tube 200. This eliminates the connection gap and step between the instrument tube 200 and the channel connector 100 after the instrument tube 200 is inserted into place. Preferably, the spiral groove 310 can be provided at the proximal end of the intermediate sleeve 300. In some embodiments, the spiral groove 310 can also be provided in the middle of the intermediate sleeve 300 to ensure the coaxiality of the instrument tube 200 when inserted into the channel connector 100.

[0045] In some embodiments, to facilitate determining the assembly status between the instrument tube 200, the intermediate sleeve 300, and the channel connector 100, such as Figures 3-6As shown, a first through hole 120 can be provided on the distal peripheral wall of the channel connector 100. The first through hole 120 is at least partially radially coincident with the proximal end of the mounting groove 110, and the first through hole 120 is connected to the mounting groove 110. Based on the above structure, the instrument tube 200 and the intermediate sleeve 300 can be inserted into the mounting groove 110 first, and then the connection between the instrument tube 200 and the proximal end wall of the mounting groove 110 can be observed through the first through hole 120 to confirm that the instrument tube 200 is accurately connected and inserted into place.

[0046] In some embodiments, to facilitate effective bonding and fixation of the instrument tube 200, intermediate sleeve 300, and channel connector 100, such as... Figure 9 As shown, a second through hole 130 can be provided on the distal peripheral wall of the channel connector 100. The second through hole 130 is located at the distal end of the mounting groove 110 and is connected to the mounting groove 110. Preferably, the first through hole 120 is connected to the second through hole 130 through the spiral groove 310. Based on the above structure, the instrument tube 200 and the intermediate sleeve 300 can be inserted into the mounting groove 110 first, and then the adhesive can be injected into the spiral groove 310 through the first through hole 120. The adhesive can then flow through the spiral groove 310 and into the second through hole 130, thereby spreading the adhesive throughout the spiral groove 310. This allows the adhesive to simultaneously bond and fix the instrument tube 200, the intermediate sleeve 300, and the channel connector 100, thereby improving the bonding and fixing quality. Preferably, adhesive can also be injected into the second through hole 130, allowing it to flow through the spiral groove 310 into the first through hole 120, thereby bonding and fixing the instrument tube 200, intermediate sleeve 300, and channel connector 100. Preferably, one of the first through hole 120 and the second through hole 130 can be connected to negative pressure, while the other is used to allow adhesive to flow through, thereby shortening the adhesive injection time and improving assembly efficiency.

[0047] Example 2

[0048] This embodiment provides an endoscope, such as Figure 1 and Figure 2 As shown, the device includes a handle 10, an insertion part 20, and the channel assembly in Embodiment 1. The proximal end of the insertion part 20 is connected to the distal end of the handle 10. The channel connector 100 is disposed on the handle 10, and the distal end of the instrument tube 200 is disposed inside the insertion part 20.

[0049] The endoscope provided in this application embodiment can be a nephroscope, or a bronchoscope, esophagoscope, gastroscope, colonoscope, otoscope, rhinoscope, oral endoscope, laryngoscope, colposcope, laparoscope, arthroscope, etc. This application embodiment does not specifically limit the type of endoscope.

[0050] Example 3

[0051] This embodiment provides an assembly method for the channel assembly as described in Embodiment 1 or the endoscope as described in Embodiment 2, including multiple assembly methods:

[0052] The first assembly method includes the following steps:

[0053] First, insert the proximal end of the intermediate sleeve 300 into the mounting groove 110;

[0054] Then the proximal end of the instrument tube 200 is inserted into the intermediate cannula 300 from the distal end of the intermediate cannula 300;

[0055] Then, abut the proximal end of the instrument tube 200 against the proximal end wall of the mounting groove 110.

[0056] The second assembly method includes the following steps:

[0057] First, insert the proximal end of the instrument tube 200 into the intermediate cannula 300 from the distal end of the intermediate cannula 300;

[0058] Then, the proximal end of the instrument tube 200 and the proximal end of the intermediate sleeve 300 are simultaneously inserted into the mounting groove 110;

[0059] Then, abut the proximal end of the instrument tube 200 against the proximal end wall of the mounting groove 110.

[0060] During assembly, the intermediate sleeve 300 is radially compressed based on the fit between the outer peripheral wall of the instrument tube 200 and the inner peripheral wall of the mounting groove 110. This compression is fed back to the instrument tube 200, ensuring that the instrument tube 200, intermediate sleeve 300, and mounting groove 110 remain coaxial. Simultaneously, the spiral groove 310 absorbs the radial deformation of the intermediate sleeve 300, preventing damage to the instrument tube 200 or mounting groove 110 due to excessive pressure. Furthermore, as the instrument tube 200 penetrates towards the distal end of the channel connector 100, the spiral groove 310 penetrating the intermediate sleeve 300 also causes a certain amount of axial deformation in the intermediate sleeve 300. This axial deformation not only increases the width of the spiral groove 310, preventing it from disappearing due to absorbing the radial deformation of the intermediate sleeve 300, but also provides a retention gap for the adhesive, increasing its size. The effective bonding area between the instrument tube 200, the intermediate sleeve 300, and the mounting groove 110 can also change the frictional resistance between the instrument tube 200 and the intermediate sleeve 300, and between the intermediate sleeve 300 and the mounting groove 110, from full-section static frictional resistance to partial sliding frictional resistance and partial static frictional resistance. This reduces the insertion resistance of the instrument tube 200, lowers the assembly difficulty, and eliminates the delicate operation of inserting the mandrel into the instrument tube 200 compared to existing technologies, reducing the operational requirements for assembly personnel and effectively improving product production quality and efficiency. After the instrument tube 200 is inserted into place, the connection between the instrument tube 200, the intermediate sleeve 300, and the mounting groove 110 can be bonded and cured, effectively eliminating the connection gap and steps between the instrument tube 200 and the channel connector 100, ensuring the quality of product assembly.

[0061] In some embodiments, for the first assembly method, after the proximal end of the instrument tube 200 abuts against the inner wall of the mounting groove 110, as shown... Figure 9 As shown, adhesive is injected through the first through hole 120 or the second through hole 130 on the distal peripheral wall of the channel connector 100 to bond and fix the instrument tube 200, intermediate sleeve 300 and mounting groove 110 together; or adhesive can be applied to the inner and outer peripheral walls of the intermediate sleeve 300 before installation; adhesive can be applied to the outer peripheral wall of the proximal end of the instrument tube 200 before installation, and the instrument tube 200, intermediate sleeve 300 and mounting groove 110 are bonded and fixed together after the proximal end of the instrument tube 200 abuts against the inner wall of the mounting groove 110.

[0062] In some embodiments, for the second assembly method, adhesive can be applied to the outer peripheral wall of the proximal end of the instrument tube 200 first. Then, the proximal end of the instrument tube 200 is inserted into the intermediate sleeve 300 from the distal end. Adhesive is then applied to the outer peripheral wall of the intermediate sleeve 300 and the spiral groove 310. Finally, the proximal ends of the instrument tube 200 and the intermediate sleeve 300 are simultaneously inserted into the mounting groove 110 until the proximal end of the instrument tube 200 and the proximal end wall of the mounting groove 110 abut against each other. Alternatively, the proximal end of the instrument tube 200 can be inserted into the intermediate sleeve 300 from the distal end first, and then adhesive is applied to the outer peripheral wall of the intermediate sleeve 300 and the spiral groove 310. Then, simultaneously insert the proximal end of the instrument tube 200 and the proximal end of the intermediate sleeve 300 into the mounting groove 110 until the proximal end of the instrument tube 200 and the proximal end wall of the mounting groove 110 abut against each other; alternatively, first insert the proximal end of the instrument tube 200 into the intermediate sleeve 300 from the distal end of the intermediate sleeve 300, then simultaneously insert the proximal end of the instrument tube 200 and the proximal end of the intermediate sleeve 300 into the mounting groove 110, and then abut against the proximal end wall of the mounting groove 110. Then, inject adhesive through the first through hole 120 or the second through hole 130 on the distal peripheral wall of the channel connector 100 to glue and fix the instrument tube 200, intermediate sleeve 300 and mounting groove 110 together.

[0063] 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.

[0064] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention 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 the present invention should be included within the scope of protection of the present invention.

Claims

1. A channel assembly for use in an endoscope, the channel assembly comprising: The application relates to a channel connector, which comprises the following parts: a channel connector, a mounting groove arranged on the distal end of the channel connector; a middle sleeve made of flexible material, the middle sleeve being provided with a spiral groove along the axial direction, the spiral groove penetrating the middle sleeve along the radial direction; and an instrument tube, the proximal end of the instrument tube penetrating the middle sleeve and being arranged in the mounting groove, the outer peripheral wall of the instrument tube being expandedly connected with the inner peripheral wall of the mounting groove through the middle sleeve, so that the channel connector and the proximal end of the instrument tube are coaxially connected. The groove bottom of the spiral groove is provided with a guide inclined surface. The groove opening of the spiral groove is provided with a transition round corner. The axial length of the middle sleeve is smaller than the axial length of the mounting groove.

2. A duct assembly according to claim 1, wherein, The distal end of the middle sleeve is provided with a stop portion which is used for abutting and cooperating with the distal end surface of the channel connector. The spiral groove is arranged at the proximal end or the middle part of the middle sleeve.

3. A duct assembly according to claim 2, wherein, The distal peripheral wall of the channel connector is provided with a first through hole which is at least partially radially coincident with the proximal end of the mounting groove, and the first through hole is communicated with the mounting groove.

4. A duct assembly according to claim 3, wherein The distal peripheral wall of the channel connector is provided with a second through hole which is arranged at the distal end of the mounting groove, and the second through hole is communicated with the mounting groove. The proximal end of the instrument tube has a difference in diameter with the inner diameter of the mounting groove, and the difference is smaller than the thickness of the middle sleeve.

5. A duct assembly according to any one of claims 1 to 4, wherein The application further relates to a channel assembly which comprises a handle, an insertion part and the channel connector and the instrument tube as claimed in any one of claims 1 to 7, the proximal end of the insertion part being connected with the distal end of the handle, the channel connector being arranged on the handle, and the distal end of the instrument tube being arranged in the insertion part.

6. A duct assembly according to claim 5, wherein The application further relates to a method for assembling the channel connector and the instrument tube, which comprises the following steps:

7. A duct assembly according to any one of claims 1 to 4, wherein The proximal end of the middle sleeve is penetrated into the mounting groove; 8. An endoscope characterized by comprising: The proximal end of the instrument tube is penetrated into the middle sleeve from the distal end of the middle sleeve; 9. A method of assembling a channel assembly according to any one of claims 1 to 7 or an endoscope according to claim 8, characterised in that, The proximal end of the instrument tube is abutted with the proximal end wall of the mounting groove. Before the middle sleeve is mounted, the inner peripheral wall and the outer peripheral wall of the middle sleeve are glued; before the instrument tube is mounted, the outer peripheral wall of the proximal end of the instrument tube is glued; and after the proximal end of the instrument tube is abutted with the inner wall of the mounting groove, the instrument tube, the middle sleeve and the mounting groove are glued and fixed. After the proximal end of the instrument tube is abutted with the inner wall of the mounting groove, the first through hole on the distal peripheral wall of the channel connector is used for glue injection, so that the instrument tube, the middle sleeve and the mounting groove are glued and fixed. ​ 10. The method of assembling according to claim 9, wherein, ​ ​

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