Joining structure, insertion part and endoscope

Abstract

The utility model discloses a connection structure, an insertion part and an endoscope, and relates to the technical field of medical instruments. The connection structure disclosed by the utility model is used for realizing the connection between the snake bone pipe and the insertion pipe in the insertion part; the connecting structure is provided with an avoiding space penetrating in the axial direction of the connecting structure, and the avoiding space is used for allowing an internal device of the insertion part to pass through; a recess is formed in the side wall, surrounding the avoiding space, of the connecting structure, the recess is formed in a matching surface of the connecting structure, the matching surface is a surface, correspondingly sleeved with a matching part, of the connecting structure, and the recess is used for containing glue liquid between the connecting structure and the matching part in the sleeving process of the connecting structure and the matching part. The scheme at least can be used for solving the problem that the snake bone tube and the insertion tube of the endoscope are easy to fail in connection.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a connecting structure, an insertion part, and an endoscope. Background Technology

[0002] With the continuous development of medical technology, endoscopes have been widely used in the diagnosis and treatment of diseases. When using an endoscope, the insertion part of the endoscope needs to be inserted into the patient's body, and the distal part of the insertion part is pulled by a traction rope to make the active bending segment bend, thereby adjusting the orientation of the distal part of the insertion part to obtain image information of the target area (such as lesions).

[0003] In related technologies, the insertion section of an endoscope includes a snake-like tube for active bending and an insertion tube for passive bending, which are fixedly assembled by adhesive bonding. In practice, endoscopes using the above-mentioned related technologies often experience connection failure due to the snake-like tube detaching from the insertion tube, rendering the endoscope unusable. Utility Model Content

[0004] This application provides a connecting structure, an insertion part, and an endoscope, which can at least solve the problem of easy connection failure between the snake-shaped tube and the insertion tube of the endoscope.

[0005] In a first aspect, embodiments of this application provide a connecting structure for the insertion portion of an endoscope.

[0006] This connecting structure is used to connect the snake-bone tube and the insertion tube in the insertion part. The connecting structure has a clearance space extending along its axial direction, which is used for the passage of internal components of the insertion part; the connecting structure has a recess around the side wall of the clearance space, which is formed on the mating surface of the connecting structure, the mating surface being the surface of the connecting structure that corresponds to its mating part, and the recess is used to accommodate the adhesive between the connecting structure and the mating part during the fitting process.

[0007] Secondly, embodiments of this application provide an insertion part that includes the connecting structure described in the first aspect of this application.

[0008] Thirdly, embodiments of this application provide an endoscope that includes the insertion portion described in the second aspect of this application.

[0009] The technical solution adopted in this application can achieve the following beneficial effects:

[0010] The connecting structure disclosed in this application has a recess on the side wall, and the recess is correspondingly located on the mating surface of the mating parts. Based on this structural layout, during the assembly process of the connecting structure and the mating parts, the adhesive that would otherwise be scraped off will be pushed into the recess, thereby reliably and effectively bonding and fixing the connecting structure and the mating parts together, so as to achieve the technical purpose of avoiding the failure of the connection between the snake bone tube and the insertion tube.

[0011] Secondly, after the adhesive in the recess has cured, it can act as an anchor between the connecting structure and the mating parts, thus optimizing the anti-detachment effect and bonding quality between the two.

[0012] In addition, this structural layout allows for the pre-filling of adhesive into the recess before assembly, ensuring that there is sufficient adhesive in the recess after assembly, thus providing better bonding quality.

[0013] Compared to related technologies, the embodiments of this application rely on the above-described connecting structure to effectively improve the bonding quality between the snake bone tube and the insertion tube, thereby preventing connection failure between the two. Attached Figure Description

[0014] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0015] In the attached diagram:

[0016] Figure 1 This is a schematic diagram of the structure of the insertion part disclosed in some embodiments of this application;

[0017] Figure 2 This is an exploded schematic diagram of the snake tail segment, connecting structure, and insertion tube disclosed in some embodiments of this application;

[0018] Figure 3 This is a schematic diagram of the connection structure disclosed in some embodiments of this application;

[0019] Figure 4 This is a schematic diagram illustrating the fit between the snake tail segment, connecting structure, and insertion tube disclosed in some embodiments of this application;

[0020] Figure 5 This is a side view of the connection structure disclosed in some embodiments of this application.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100 - Snake bone tube, 110 - Snake bone tail segment, 200 - Insertion tube

[0023] 300 - Adapter, 300a - Clearance space, 300b - Recess, 300b1 - First sidewall, 300b2 - Second sidewall, 300c - Deformation notch, 310 - First adapter section, 320 - Second adapter section

[0024] 400 - Instrument tube, 500 - Lens harness, 600 - Light source harness. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] 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".

[0027] To facilitate understanding of the connecting structure, insertion part, and endoscope provided in the embodiments of this application, the relevant technologies will first be introduced in conjunction with the application scenarios below.

[0028] In related endoscopic techniques, it is often found that the connection between the snake bone tube and the insertion tube fails. Since they are the main parts of the insertion section of the endoscope, the endoscope cannot be used normally.

[0029] Through research, the inventors discovered that the aforementioned problems were primarily caused by the poor bonding quality between the snake-bone tube and the insertion tube. Specifically, both the snake-bone tube and the insertion tube are tubular components, typically fixed together by adhesive bonding between their walls after assembly. Before assembly, adhesive needs to be applied to the side wall of one component, and then it is assembled with the other. During assembly, because the gap between the insertion tube and the snake-bone tube is usually small, the adhesive on the side wall is scraped away, preventing effective bonding and leading to detachment or connection failure. For example, when the insertion tube is fitted onto the snake-bone tube, adhesive can be applied first to the outer surface of the snake-bone tube's side wall, and then the insertion tube can be gradually fitted onto the snake-bone tube. During this process, the distal end of the insertion tube will scrape away adhesive from the snake-bone tube, resulting in very little adhesive remaining between the two components after assembly.

[0030] Of course, the above-mentioned failure of the connection between the snake bone tube and the insertion tube covers the connection between the two through an adapter. There are still cases where the three are fixed by adhesive. Since the principle of the problem is similar, it will not be elaborated here.

[0031] In view of this, some embodiments of this application provide a connecting structure for the insertion portion of an endoscope.

[0032] Please see Figures 1-5 As shown, the connecting structure disclosed in this application embodiment is used to realize the connection between the snake bone tube 100 and the insertion tube 200 in the insertion part.

[0033] The connecting structure has a clearance space 300a extending along its axial direction, the clearance space 300a being for the passage of internal components of the insertion part, such as... Figure 1 As shown, the internal components typically include an instrument tube 400, a lens harness 500, a light source harness 600, etc. In a multiplexer, the internal components may also be a water injection tube, an air injection tube, etc.

[0034] Meanwhile, the connecting structure has a recess 300b on the side wall of the clearance space 300a. The recess 300b is formed on the mating surface of the connecting structure. The mating surface is the surface of the connecting structure that corresponds to the mating part. The recess 300b is used to retain the adhesive between the connecting structure and the mating part during the fitting process.

[0035] Regarding the mating component, it is a part in the insertion section that fits into the connecting structure. For example, if the connecting structure is the snake tail segment 110 of the snake tube 100, then the mating component can be the insertion tube 200, or more specifically, the distal end of the insertion tube 200. It is worth noting that in embodiments where the snake tube 100 includes multiple snake units that are rotatably connected in sequence, the proximal snake unit is called the snake tail segment 110.

[0036] With this layout, during the assembly of the connecting structure and mating parts, even if the adhesive is scraped away by the end of the fitted part, as the part pushes the adhesive, the adhesive will be pushed to the area of ​​the recess 300b and flow into the recess 300b. Some of the adhesive is retained in the recess 300b. Compared with the situation where the adhesive in the assembly gap of the parts is easily scraped away, the recess 300b of this embodiment can retain more adhesive that would otherwise be scraped away, thereby enabling the connecting structure and mating parts to be reliably and effectively bonded and fixed together, so as to achieve the technical purpose of avoiding the failure of the connection between the snake tube 100 and the insertion tube 200.

[0037] Secondly, it is important to note that when the recess 300b of the connecting structure contains adhesive, once the adhesive has cured, it forms an anchor point at the mating surface between the connecting structure and the mating part. The fixing and limiting function it plays is no longer limited to the gap between the mating surfaces of the connecting structure and the mating part, but is embedded in the side wall of the connecting structure. The tensile strength of the adhesive cured in the recess 300b is significantly improved, thus providing a better anti-detachment effect and greatly optimizing the bonding quality.

[0038] In addition, adhesive can be pre-filled into the recess 300b before assembly. This will ensure that there is enough adhesive in the recess 300b after assembly, thus ensuring that there is enough adhesive in the recess 300b to provide better bonding quality.

[0039] The embodiments of this application do not limit the specific type of connection structure.

[0040] For example, such as Figures 1-4 As shown, the connecting structure includes a connector 300 between the snake-bone tube 100 and the insertion tube 200. A recess 300b is formed on the connector 300, and the insertion tube 200 strengthens its bond with the connector 300 through adhesive within the recess 300b. In this example, the recess 300b may not be formed on the snake-bone tube 100 and the insertion tube 200 to ensure structural strength. Exemplarily, the connecting structure includes a snake-bone tail segment 110, and a recess 300b is formed on the snake-bone tail segment 110. The insertion tube 200 or the connector 300 strengthens its bond with the snake-bone tail segment 110 through adhesive within the recess 300b. Exemplarily, the connecting structure includes the distal end of the insertion tube 200, and a recess 300b is provided on the distal sidewall of the insertion tube 200. The snake-bone tube 100 or the connector 300 strengthens its bond with the insertion tube 200 through adhesive within the recess 300b.

[0041] In some embodiments, the connecting structure may refer to the entire snake bone tube 100 or the entire insertion tube 200. Particularly when the snake bone tube 100 adopts a one-piece structure type (e.g., a one-piece cut snake bone), the connecting structure may refer to the entire snake bone tube 100. Typically, the insertion tube 200 is machined as a single component, so the connecting structure may refer to the entire insertion tube 200.

[0042] Of course, the purpose of the recess 300b is to retain the adhesive and optimize the bonding effect. Therefore, the connecting structure can include multiple components. For example, when the snake tube 100 is connected to the insertion tube 200 via the adapter 300, recesses 300b can be provided on both mating surfaces to retain more adhesive, thereby further optimizing the bonding quality. The above concept applies to the scheme of directly connecting the snake tube 100 and the insertion tube 200, and will not be elaborated further.

[0043] Additionally, it is worth noting that the adapter 300 can also be fitted onto the outside of the snake tube 100 and the insertion tube 200.

[0044] In the embodiments of this application, the specific structural form of the recess 300b is not limited.

[0045] In some embodiments, such as Figure 3 and Figure 4 As shown, the recess 300b radially penetrates the sidewall of the connecting structure. In this example, the recess 300b penetrating the sidewall of the connecting structure is easier to manufacture and has lower cost. When used in a double-layered assembly structure, such as a set of snake tube 100 and insertion tube 200, or a set of adapter 300 and insertion tube 200, because the endoscope is a very small precision instrument, the adhesive in the penetrating recess 300b will remain within the penetrating recess 300b due to surface tension, and will not flow into the clearance space 300a, thus not affecting the installation of internal components. When this solution is applied to a three-layer assembly structure, for example, the snake tube 100 and the insertion tube 200 are respectively fitted inside and outside the adapter 300. The recess 300b on the adapter 300 can accommodate the adhesive on its inner and outer sides. The two parts of adhesive will become one in the recess 300b, so that the adhesive can bond the snake tube 100, the adapter 300 and the insertion tube 200 at the same time, providing a stronger anchoring effect and further optimizing the bonding quality.

[0046] In another embodiment, the recess 300b is a groove, meaning that the recess 300b does not penetrate the sidewall of the connecting structure. With this arrangement, while the adhesive is contained within the recess 300b, it can be completely ensured that the adhesive does not enter the clearance space 300a within the connecting structure.

[0047] In the embodiments of this application, the shape of the recess 300b on the sidewall of the connecting structure is not limited.

[0048] For example, the recess 300b can be a dot-like structure on the sidewall of the connecting structure, such as a circular hole.

[0049] In some embodiments, recess 300b includes strip-shaped recesses (see reference). Figure 3 and Figure 4 At least one of the following: wavy recess, spiral recess, etc. It should be understood that such a recess 300b has a certain extension length on the sidewall of the connecting structure, which will be able to accommodate more adhesive to optimize the bonding quality between the connecting structure and the mating parts.

[0050] Furthermore, such as Figure 3 and Figure 4As shown, the connecting structure includes a recess 300b extending in a strip shape along its axial direction. With this arrangement, during the axial assembly of the connecting structure and the mating component, the assembly direction aligns with the extension path of the strip-shaped recess 300b. The pushed adhesive then flows into the recess 300b. Due to the adhesive's viscosity, the axially oriented strip-shaped recess 300b guides the adhesive to flow along the assembly direction, increasing the bonding area between the adhesive and the connecting structure and mating component. Simultaneously, the strip-shaped recess 300b provides a longer time window for the adhesive to flow into the recess 300b during assembly. Therefore, this structural layout reduces adhesive waste to some extent and optimizes the bonding quality.

[0051] In another embodiment, the connecting structure includes a recess 300b extending in a strip along its circumference. In this example, the circumferentially extending strip-shaped recess 300b provides a larger coverage area in the circumference of the connecting structure. During the assembly of the connecting structure and the mating component, as the scraped adhesive passes through the recess 300b, a greater amount of adhesive simultaneously flows into the recess 300b in the circumferential direction. Ultimately, the circumferential strip-shaped recess 300b provides a ring-shaped adhesive path. Thus, this arrangement can reduce adhesive waste to a certain extent and optimize the bonding quality.

[0052] In some embodiments, the aforementioned axial strip-shaped recesses 300b and circumferential strip-shaped recesses 300b can be arranged crosswise on the sidewalls of the connecting structure. This increases the adhesive capacity and enables reliable bonding in different directions, thereby further optimizing the bonding quality. Furthermore, the crosswise axial strip-shaped recesses 300b and circumferential strip-shaped recesses 300b can form a mesh structure to further enhance the bonding quality.

[0053] In some embodiments, such as Figures 2-4 As shown, the connecting structure has a deformation notch 300c extending axially from one end, the deformation notch 300c being used to provide deformation when the connecting structure is assembled with the mating parts.

[0054] It should be understood that during the assembly process of the snake-bone tube and the insertion tube in the relevant technology, the small assembly gap between the two can easily cause them to get stuck due to interference. This can lead to multiple attempts to assemble them successfully. During this process, the adhesive on the mating surfaces of the two tubes can be scraped off multiple times, resulting in ineffective bonding and ultimately leading to connection failure.

[0055] To address this, an axially extending deformation notch 300c is created on the sidewall of the connecting structure. During assembly, the connecting structure undergoes radial inward elastic deformation along the assembly direction, allowing for adjustable assembly gaps, reducing assembly resistance, and thus improving assembly efficiency. This prevents interference and jamming, reducing wasted adhesive and optimizing bonding quality to some extent. Combined with the adhesive retention effect of the recess 300b, assembly smoothness is ensured while preventing adhesive loss, achieving highly reliable bonding.

[0056] Furthermore, the connecting structure includes recesses 300b on both sides of the deformation notch 300c in the circumferential direction. It should be understood that due to the presence of the deformation notch 300c, the connecting structure will be recessed in the radial direction corresponding to the deformation notch 300c, while the portion of the connecting structure on both sides of the deformation notch 300c will be expanded outward along the radial direction. This will exacerbate the scraping of adhesive in this area during the assembly of the connecting structure and its mating parts, and may even completely scrape away the adhesive, thus making the connection more prone to failure.

[0057] In this example, by setting recesses 300b on both sides of the deformation notch 300c, the recesses 300b can be used to hold the applied adhesive, and the adhesive in the recesses 300b can be used to bond the connecting structure and the mating parts to ensure reliable bonding. At the same time, the deformation notch 300c can also improve the smoothness of assembly.

[0058] In some embodiments, when the connecting structure includes an adapter 300, the adapter 300 includes a first adapter segment 310 and a second adapter segment 320 distributed along its axial direction. The first adapter segment 310 is used to fit the snake tube 100, and the second adapter segment 320 is used to fit the insertion tube 200. The adapter 300 has a recess 300b provided at the joint of the first adapter segment 310 and the second adapter segment 320, so that after the snake tube 100 and the insertion tube 200 are fitted into place on the adapter 300, the three are bonded and fixed by adhesive in the recess 300b at the joint.

[0059] Please refer to Figures 1-5 , Figure 5 The dashed line l1 shown (corresponding to the first sidewall 300b1 of the recess 300b) divides the adapter 300 into a first adapter segment 310 on the left and a second adapter segment 320 on the right. In another embodiment, it is also possible to... Figure 5 The dashed line l2 shown (corresponding to the second sidewall 300b2 of the recess 300b) divides the adapter 300 into a first adapter segment 310 on the left and a second adapter segment 320 on the right. In another embodiment, it can be achieved through... Figure 5The dashed lines l1 (corresponding to the first sidewall 300b1 of the recess 300b) and l2 (corresponding to the second sidewall 300b2 of the recess 300b) together divide the adapter 300 into the first adapter segment 310 on the left and the second adapter segment 320 on the right, while the area between the dashed lines l1 and l2 does not belong to the socket area.

[0060] In the above embodiment, by providing a recess 300b at the junction of the first adapter segment 310 and the second adapter segment 320, the scraped adhesive enters the recess 300b, enabling it to simultaneously bond the adapter 300, the snake tube 100, and the insertion tube 200. After curing, it forms an adhesive spanning the adapter 300, the snake tube 100, and the insertion tube 200, significantly improving the bonding strength and thus the bonding quality. It is noteworthy that if both the snake tube 100 and the insertion tube 200 are bonded to the adapter 300, during the assembly process, both the snake tube 100 and the insertion tube 200 will push the scraped adhesive into the recess 300b at the junction, increasing the amount of adhesive inside and thus optimizing the bonding quality.

[0061] In some embodiments, the recess 300b at the joint extends radially through the sidewall of the adapter 300, and the snake-bone tube 100 and the insertion tube 200 are fitted on the same side of the adapter 300 in the radial direction. For example... Figures 1-4 As shown, both the snake-bone tube 100 and the insertion tube 200 are fitted onto the outside of the adapter 300. This structural layout reduces the radial thickness of the snake-bone tube 100, adapter 300, and insertion tube 200 when fitted together, which helps to reduce the radial dimension of the insertion part and provides a larger accommodating space inside the insertion part to avoid internal components.

[0062] In some embodiments, the recess 300b at the joint extends radially through the sidewall of the adapter 300, and the snake tube 100 and the insertion tube 200 are fitted on opposite sides of the adapter 300 in the radial direction. For example, the snake tube 100 is fitted on the outside of the adapter 300, and the insertion tube 200 is fitted on the inside of the adapter 300. In this arrangement, when the snake tube 100, the adapter 300, and the insertion tube 200 are assembled in place, the snake tube 100 and the insertion tube 200 will push adhesive from the inner and outer sidewalls of the adapter 300 into the recess 300b at the joint, so that the adhesive between the snake tube 100 and the insertion tube 200 and located in the recess 300b is more fully filled, reducing the presence of pores and thus optimizing the bonding quality.

[0063] In some embodiments, such as Figures 1-4As shown, the connecting structure is configured such that, after the snake tube 100 is installed in place on the first adapter section 310, the first sidewall 300b1 of the recess 300b at the joint is flush with the proximal end face of the snake tube 100, and the first sidewall 300b1 is the sidewall of the recess 300b closer to its distal end along the axial direction of the adapter 300. And / or, after the insertion tube 200 is installed in place on the second adapter section 320, the second sidewall 300b2 of the recess 300b at the joint is flush with the distal end face of the insertion tube 200, and the second sidewall 300b2 is the sidewall of the recess 300b closer to its proximal end along the axial direction of the adapter 300. In other words, this example essentially sets the end face of the snake tube 100 or the insertion tube 200 flush with the corresponding sidewall of the recess 300b.

[0064] In this arrangement, when the adhesive is pushed into the recess 300b at the joint through the snake-bone tube 100 or the insertion tube 200, since the end face of the former is flush with the corresponding sidewall of the recess 300b, the adhesive flowing into the recess 300b completely covers the end face of the snake-bone tube 100 or the insertion tube 200 and the corresponding sidewall of the recess 300b. If the snake-bone tube 100 or the insertion tube 200 continues to be pushed, a stepped structure is formed with the corresponding sidewall of the recess 300b. For example, refer to... Figure 4 and Figure 5 If the snake tube 100 continues to be pushed to the right and goes beyond the dotted line l1, it will pull the adhesive in the recess 300b, which will cause the adhesive to be damaged. Therefore, the above flush solution is conducive to maintaining the adhesive to simultaneously cover the end face of the snake tube 100 or the insertion tube 200 with the corresponding side wall of the recess 300b, so as to obtain better bonding quality.

[0065] Please see Figures 1-5 Some embodiments of this application provide an insertion part that includes the connecting structure mentioned in any of the foregoing solutions, thereby possessing the beneficial effects of the aforementioned connecting structure, which will not be elaborated further here.

[0066] Please see Figures 1-5 Some embodiments of this application provide an endoscope that includes the insertion portion mentioned above, thereby possessing the beneficial effects of the aforementioned insertion portion, which will not be described in detail here.

[0067] The endoscopes involved in the embodiments of this application may be bronchoscopes, pyeloscopes, esophagoscopes, gastroscopes, colonoscopes, otoscopes, rhinoscopes, oral endoscopes, laryngoscopes, colposcopes, laparoscopes, arthroscopes, etc. The embodiments of this application do not specifically limit the types of endoscopes.

[0068] The above embodiments of this application focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be described in detail here.

[0069] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A connecting structure for the insertion portion of an endoscope, characterized in that, The connecting structure is used to connect the snake-bone tube in the insertion part to the insertion tube; The connecting structure has a clearance space extending along its axial direction, which is used for the internal components of the insertion part to pass through; the connecting structure has a recess around the side wall of the clearance space, which is formed on the mating surface of the connecting structure, the mating surface being the surface of the connecting structure that corresponds to the mating part when fitted together, and the recess is used to accommodate the adhesive between the connecting structure and the mating part during the fitting process.

2. The connecting structure according to claim 1, characterized in that, The depression includes at least one of the following: strip-shaped depression, wavy depression, and spiral depression; And / or, the connecting structure has a deformation notch extending axially from one end thereto, the deformation notch being used to provide deformation when the connecting structure is fitted with the mating part.

3. The connecting structure according to claim 2, characterized in that, The connecting structure includes the recess extending in a strip shape along its axial direction; and / or, the connecting structure includes the recess extending in a strip shape along its circumferential direction; and / or, the connecting structure includes the recesses located on both sides of the deformation notch in the circumferential direction.

4. The connecting structure according to any one of claims 1 to 3, characterized in that, The recess extends radially through the sidewall of the connecting structure, or the recess is a groove.

5. The connecting structure according to any one of claims 1 to 3, characterized in that, The connecting structure includes a snake-like tail segment; and / or, the connecting structure includes the distal end of an insertion tube; and / or, the connecting structure includes a connector between the snake-like tube and the insertion tube.

6. The connecting structure according to claim 5, characterized in that, When the connecting structure includes the adapter, the adapter includes a first adapter segment and a second adapter segment distributed along its axial direction. The first adapter segment is used to fit the snake-bone tube, and the second adapter segment is used to fit the insertion tube. The adapter has a recess at the joint of the first adapter segment and the second adapter segment, so that after the snake-bone tube and the insertion tube are fitted into place on the adapter, the three are bonded and fixed by adhesive in the recess at the joint.

7. The connecting structure according to claim 6, characterized in that, The recess at the joint extends radially through the sidewall of the adapter, and the snake-bone tube and the insertion tube are fitted on the same or opposite sides of the adapter in the radial direction.

8. The connecting structure according to claim 6 or 7, characterized in that, The connecting structure is configured such that, after the snake-bone tube is installed in place on the first adapter section, the first sidewall of the recess at the joint is flush with the proximal end face of the snake-bone tube, and the first sidewall is the sidewall in the recess that is closer to its distal end along the axial direction of the adapter; and / or, after the insertion tube is installed in place on the second adapter section, the second sidewall of the recess at the joint is flush with the distal end face of the insertion tube, and the second sidewall is the sidewall in the recess that is closer to its proximal end along the axial direction of the adapter.

9. An insertion part, characterized in that, The connecting structure includes any one of claims 1 to 8.

10. An endoscope, characterized in that, Includes the insertion portion as described in claim 9.

Images