Assembly structure of front end shell and snake bone first section, insertion part and endoscope

Abstract

The utility model provides an assembling structure of a front end shell and a snake bone first section, an insertion part and an endoscope, and belongs to the technical field of endoscopes. The assembling structure comprises a front end shell and a snake bone head section which are coaxially arranged, a near-end opening of the front end shell is a glue injection opening, and the interior of the front end shell is communicated with the interior of the snake bone head section to form a mounting channel for an instrument of an endoscope to penetrate through; the near end of the front end shell is provided with at least one connecting lug part, the connecting lug part is formed by protruding part of the pipe wall of the front end shell in the axial direction, the wall thickness of the connecting lug part is smaller than or equal to that of the front end shell, and the connecting lug part is fixedly connected with the snake bone first section. According to the utility model, the near-end opening of the front end shell is set as the glue injection port, so that the convenience of glue injection operation and the glue injection quality in the front end shell are improved; the connecting lug part is formed by protruding the pipe wall of the front end shell, and a connecting structure of the connecting lug part and the front end shell is omitted, so that the connecting lug part is prevented from occupying the internal space of the front end shell, the glue injection space of the front end shell is enlarged, and glue injection operation is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of endoscopes, and in particular relates to an assembly structure of a front end shell and a snake bone first section, an insertion part and an endoscope. Background Art

[0002] As a medical diagnostic instrument, an endoscope can enter the body and take images of the lesion through a camera packaged at the far end, providing doctors with sufficient diagnostic information to treat the disease. The endoscope includes an insertion part, which can enter the body through a human cavity or a surgical incision.

[0003] The insertion part includes a serpentine segment and a front-end component, the front-end component is located at the distal end of the serpentine segment, and the front-end component bends following the bending of the serpentine segment. During the assembly process of the front-end component and the serpentine segment, the two are usually assembled by injection of glue. The first section of the serpentine segment is provided with an injection port, and the front-end shell of the front-end component is injected with glue through the injection port. However, due to the small size of the first section of the serpentine, the size of the injection port is also small due to the size limitation of the first section of the serpentine, resulting in insufficient operating space during the injection process and affecting the injection quality of the front-end component. Utility Model Content

[0004] The purpose of the present application is to provide an assembly structure of a front end shell and the first section of the snake bone, an insertion part and an endoscope to solve the above-mentioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] In the first aspect, the present application provides an assembly structure of a front end shell and a serpentine first section, comprising a coaxially arranged front end shell and a serpentine first section, the proximal opening of the front end shell being a glue injection port, the interior of the front end shell and the interior of the serpentine first section being connected to form an installation channel for endoscopic instruments to pass through; the proximal end of the front end shell has at least one connecting ear, the connecting ear is formed by a partial tube wall of the front end shell protruding along its axial direction, and the wall thickness of the connecting ear is less than or equal to the wall thickness of the front end shell, and the connecting ear is fixedly connected to the serpentine first section.

[0007] In a second aspect, the present application provides an insertion portion, comprising the assembly structure provided in the first aspect.

[0008] In a third aspect, the present application provides an endoscope, comprising the insertion portion provided in the second aspect.

[0009] The technical solution provided by this application can achieve the following beneficial effects:

[0010] In the present application, the proximal opening of the front end shell is set as a glue injection port, and glue can be injected into the interior of the front end shell before the front end shell is connected to the first section of the snake bone. Since the proximal opening of the front end shell is relatively large, it is convenient for the operator to control the glue injection position, and it is also convenient for the operator to observe and judge the amount of glue injected into the interior of the front end shell, so that the glue evenly fills the interior of the front end shell, thereby improving the quality of glue injection; at the same time, a protrusion is set on the connecting ear to prevent excess glue in the front end shell from overflowing to the connecting ear, providing a clean environment for the connecting ear, thereby improving the connection stability between the connecting ear and the snake bone; in addition, the connecting ear is still formed by the protrusion of the tube wall of the front end shell, and the connection structure between the connecting ear and the front end shell is omitted, thereby avoiding the connecting ear occupying the internal space of the front end shell, expanding the glue injection space in the front end shell, and facilitating the glue injection operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 This is a schematic diagram of the overall structure of the front end shell and the first section of the snake bone provided in some embodiments of the present application. Figure 1 ;

[0013] Figure 2 This is a schematic diagram of the disassembly of the assembly structure of the front end shell and the first section of the snake bone provided in some embodiments of the present application Figure 1 ;

[0014] Figure 3 This is a schematic diagram of the assembly process of the front end shell and the first section of the snake bone provided in some embodiments of the present application Figure 1 ;

[0015] Figure 4 This is a schematic diagram of the assembly process of the front end shell and the first section of the snake bone provided in some embodiments of the present application Figure 2 ;

[0016] Figure 5 This is a schematic diagram of the assembly process of the front end shell and the first section of the snake bone provided in some embodiments of the present application Figure 3 ;

[0017] Figure 6 This is a schematic diagram of the overall structure of the front end shell and the first section of the snake bone provided in some embodiments of the present application. Figure 2 ;

[0018] Figure 7 This is a schematic diagram of the disassembly of the assembly structure of the front end shell and the first section of the snake bone provided in some embodiments of the present application Figure 2 ;

[0019] Figure 8 This is a schematic diagram of the assembly process of the front end shell and the first section of the snake bone provided in other embodiments of the present application. Figure 1 ;

[0020] Fig. 9 This is a schematic diagram of the assembly process of the front end shell and the first section of the snake bone provided in other embodiments of the present application. Figure 2 .

[0021] In the figure: 100 - front end shell, 200 - first section of snake bone, 210 - connecting groove, 211 - second stop portion, 211a - stop surface, 300 - connecting ear, 310 - first stop portion, 400 - snake bone section, 500 - pivot center. DETAILED DESCRIPTION

[0022] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0023] It should be noted that, in each embodiment of the present application, "proximal end" and "distal end" refer to the position of the endoscope and its accessories relative to the user in the use environment, wherein 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".

[0024] In the related art, glue is injected into the front end shell through the glue injection port on the first section of the snake bone after the first section of the snake bone and the front end shell are assembled together. However, the size of the first section of the snake bone is relatively small, and the size of the glue injection port set on the first section of the snake bone is even smaller. It is more difficult for the operator to align the glue syringe with the glue injection port. The operating space of the syringe is insufficient, and the difficulty of glue injection increases. In addition, since the glue injection port is too small, the glue injection speed is slow, and the glue flows slowly in the front end shell. It is easy for the space near the glue injection port in the front end shell to have sufficient glue, while the space far from the glue injection port is insufficient. The amount of glue injected in the front end shell is uneven, which affects the glue injection quality.

[0025] In view of this, an embodiment of the present application provides an assembly structure of a front end shell 100 and a first section of the snake bone 200, wherein the proximal opening of the front end shell 100 is set as a glue injection port, and a tube wall protrusion of the front end shell 100 is set to form a connecting ear 300, which improves the convenience of glue injection for the front end shell 100 while ensuring the connection stability between the front end shell 100 and the first section of the snake bone 200.

[0026] The assembly structure provided by the embodiment of the present application includes a front end shell 100 and a snake bone first section 200 arranged coaxially. The front end shell 100 and the snake bone first section 200 are both roughly cylindrical structures, hollow inside and open at both ends. The interior of the front end shell 100 and the interior of the snake bone first section 200 are connected to form an installation channel for the endoscope's instruments to pass through, and the instruments include but are not limited to instrument tubes, optical fibers, etc. The front end shell 100 is the shell of the front end assembly in the endoscope, and devices such as cameras and lighting modules are installed inside. The snake bone first section 200 is a snake bone section 400 located at the distal end of the snake bone section of the insertion part of the endoscope, which is used to fix with the front end assembly. The snake bone section includes a plurality of snake bone sections 400 arranged in sequence, and two adjacent snake bone sections 400 are connected by a pivot center 500, and the two adjacent snake bone sections 400 are rotated by the pivot center 500, and the snake bone section 400 located at the distal end of the snake bone section is called the snake bone first section 200. The first section 200 of the snake bone and the front end shell 100 are connected and fixed to each other so that the front end shell 100 and the first section 200 of the snake bone move synchronously under the drive of the traction rope.

[0027] The proximal opening of the front end shell 100 is used as a glue injection port. Before the front end shell 100 and the first section of the snake bone 200 are connected, glue is injected into the front end shell 100. The front end shell 100 is placed vertically with its axis perpendicular to the horizontal plane, and glue is injected through the proximal opening of the front end shell 100. Compared with the glue injection port in the prior art, the proximal opening of the front end shell 100 is used as the glue injection port, and the size of the glue injection port is enlarged, the syringe is easy to align with the glue injection port, the operating space for glue injection is sufficient, and the difficulty of glue injection is reduced. In addition, due to the large size of the glue injection port and the fast glue injection flow rate, the glue liquid can quickly fill the front end shell 100, and it is also convenient for the operator to observe and judge the amount of glue injected inside the front end shell 100, so that the glue liquid evenly fills the inside of the front end shell 100, improving the glue injection quality.

[0028] The proximal end of the front end shell 100 has at least one connecting ear 300, which is formed by a part of the tube wall of the front end shell 100 protruding along its axial direction, and the wall thickness of the connecting ear 300 is less than or equal to the wall thickness of the front end shell 100. Due to the protruding setting of the connecting ear 300, during the process of injecting glue into the front end shell 100, even if there is too much glue, part of the excess glue overflows from the proximal side of the front end shell 100, but the excess glue cannot overflow to the position where the connecting ear 300 is located, and can only overflow from the position where the connecting ear 300 is not provided at the proximal end of the front end shell 100, which can avoid the overflowing glue from contaminating the connecting ear 300, thereby providing a clean environment for the connecting ear 300. After the glue in the front end shell 100 is solidified, the front end shell 100 and the first section of the snake bone 200 are aligned, and the connecting ear 300 of the front end shell 100 is fixedly connected with the first section of the snake bone 200 to fix the relative position of the front end shell 100 and the first section of the snake bone 200. Furthermore, since the connecting ear 300 is not contaminated by the glue, the connection between the connecting ear 300 and the first section of the snake bone 200 can be made more stable, and the front end shell 100 and the first section of the snake bone 200 are connected more firmly.

[0029] Since the connecting ear 300 is formed by a protrusion of the tube wall of the front end shell 100, and the wall thickness of the connecting ear 300 is less than or equal to the wall thickness of the front end shell 100, the connecting ear 300 and the front end shell 100 are integrally formed, and the two do not need to be connected, thereby avoiding the situation where the connecting ear 300 is fixed in the front end shell 100 and occupies the glue injection space inside the front end shell 100, thereby providing a larger glue injection space for the front end shell 100, making it easier for the operator to inject glue into the front end shell 100.

[0030] In some embodiments, the connecting ear 300 is fixed to the first section of the serpentine bone 200 by gluing. After the glue in the front end shell 100 is solidified, the front end shell 100 is coaxially aligned with the first section of the serpentine bone 200, and the circumferential and axial positions of the two are installed in place, the glue is injected between the connecting ear 300 and the first section of the serpentine bone 200, thereby achieving the fixation of the connecting ear 300 and the first section of the serpentine bone 200. In other embodiments, after the glue in the front end shell 100 is solidified, the front end shell 100 and the first section of the serpentine bone 200 are installed in place, and the connecting ear 300 and the first section of the serpentine bone 200 are connected by welding, and the relative position of the connecting ear 300 and the first section of the serpentine bone 200 can also be fixed.

[0031] In some embodiments of the present application, the distal end of the snake bone first section 200 has at least one connecting groove 210, and the connecting groove 210 is formed by a portion of the tube wall of the snake bone first section 200 being recessed toward its proximal end. The connecting groove 210 is connected to the connecting ear 300 in a one-to-one correspondence, and the connecting groove 210 is used to accommodate the connecting ear 300. Since the connecting ear 300 is formed by the protrusion of the tube wall of the front end shell 100, and the connecting groove 210 is formed by the depression of the tube wall of the snake bone first section 200, and the connecting ear 300 can be installed in the connecting groove 210, therefore, the outer peripheral wall of the front end shell 100 and the outer peripheral wall of the snake bone first section 200 can be arranged flush in the axial direction of the front end shell 100 or the axial direction of the snake bone first section 200, so that the connection part of the front end shell 100 and the snake bone first section 200 has a smooth transition, and when the front end shell 100 and the snake bone first section 200 are subsequently covered with a skin woven mesh or other structures, the smooth connection structure between the two will not cause wear to the skin or the woven mesh, and the size of the distal end of the insertion part is consistent, which is more convenient for the doctor to operate the insertion part to enter the human body.

[0032] In the process of assembling the front end shell 100 and the first snake bone section 200, the two need to be installed to a preset position before welding or gluing the joints between the two. Figures 1 to 9 As shown, the connecting ear 300 has a first stopper 310, which is formed by the connecting ear 300 protruding along the circumference of the front end shell 100, and the connecting groove 210 has a second stopper 211, which is formed by the groove wall of the connecting groove 210 protruding toward the inside of the connecting groove 210 along the circumference of the snake bone first section 200. The first stopper 310 can cooperate with the second stopper 211. When the connecting ear 300 is inserted into the connecting groove 210, the first stopper 310 can be set at the proximal end of the second stopper 211. The first stopper 310 cooperates with the second stopper 211 at the axial upper limit of the front end shell 100, and the second stopper 211 is used to prevent the first stopper 310 from moving along the axis of the front end shell 100 and thus detaching from the snake bone first section 200.

[0033] The mutual cooperation between the first stop portion 310 and the second stop portion 211 can preliminarily fix the positions of the front end shell 100 and the snake bone first section 200, so that when the ear portion 300 and the snake bone first section 200 are subsequently welded and connected, or when the ear portion 300 and the snake bone first section 200 are glued and connected, the positions of the front end shell 100 and the snake bone first section 200 can be maintained stable, avoiding misalignment between the front end shell 100 and the snake bone first section 200.

[0034] Due to the structural limitations of the second stopper 211 and the first stopper 310, directly inserting the connecting ear 300 into the connecting groove 210 along the axial direction of the front end shell 100 cannot make the connecting ear 300 and the connecting groove 210 assembled in place. In this regard, in some embodiments of the present application, the assembly of the connecting ear 300 and the connecting groove 210 is divided into two steps. First, the connecting ear 300 is inserted into the connecting groove 210 along the axial direction of the front end shell 100, and then the front end shell 100 is rotated to assemble the first stopper 310 to the proximal end of the second stopper 211, so that the front end shell 100 and the snake bone first section 200 are assembled in place.

[0035] In the specific implementation, refer to Figures 1 to 5 As shown, along the circumference of the snake bone first section 200, the width of the portion of the connecting groove 210 where the second stopper 211 is provided is the first width, and along the circumference of the front end shell 100, the width of the portion of the connecting ear 300 where the first stopper 310 is provided is the second width. The first width is greater than or equal to the second width. The second stopper 211 occupies part of the groove space of the connecting groove 210, so the width of the connecting groove 210 in the area where the second stopper 211 is provided is narrower. The first stopper 310 is a protruding portion on the connecting ear 300, so the width of the connecting ear 300 in the area where the first stopper 310 is provided is wider.

[0036] Since the first width is greater than or equal to the second width, the connecting ear portion 300 can be directly inserted into the connecting groove 210 along the axial direction of the front end shell 100. Figure 3 As shown, Figure 3 The direction of the dashed arrow indicates the insertion direction of the connecting ear 300. At this time, there is no limit fit between the first stopper 310 and the second stopper 211, and the front end shell 100 or the snake bone first section 200 needs to be rotated. Figure 4 As shown, Figure 4 The direction of the dotted arrow indicates the rotation direction of the first stopper 310, so that the first stopper 310 can rotate along the circumference of the first segment 200 of the snake bone to the proximal end of the second stopper 211, and the first stopper 310 can cooperate with the second stopper 211 in the axial upper limit position of the front end shell 100. Rotate the first stopper 310 until the first stopper 310 abuts against the groove wall of the connecting groove 210, and the first stopper 310 rotates to the position, refer to Figure 5 As shown, glue can be dispensed along the contact portion between the connecting ear 300 and the connecting groove 210 to fix the position of the front end shell 100 and the snake bone first section 200. It should be noted that in this installation and connection method, the connecting ear 300 cannot fill all the space of the connecting groove 210, and part of the space of the connecting groove 210 is vacant, which can be filled with glue later.

[0037] The surface of the second stopper 211 that is used to abut against the first stopper 310 is a stopper surface 211a. Figure 2 As shown. In some preferred embodiments, the stop surface 211a is arranged to extend along the circumference of the first segment of the serpentine bone 200, so that the stop surface 211a is perpendicular to the axial direction of the front end shell 100, thereby improving the limiting effect of the second stop portion 211 on the first stop portion 310. In some other preferred embodiments, the stop surface 211a is arranged perpendicularly to the groove wall of the adjacent connecting groove 210, and / or the stop surface 211a is arranged perpendicularly to the surface of the adjacent second stop portion 211. The vertical arrangement can avoid the second stop portion 211 from being too thin, resulting in too low structural strength of the second stop portion 211, and can also improve the stopping effect on the first stop portion 310. Since the size of the first segment of the serpentine bone 200 and the front end shell 100 is small, if the chamfering setting between the stop surface 211a and the groove wall of the adjacent connecting groove 210 is set, on the one hand, the process is increased, and on the other hand, the chamfering will reduce the area of ​​the stop surface 211a, thereby weakening the stopping effect on the first stop portion 310.

[0038] In other embodiments of the present application, the connecting ear 300 and the connecting groove 210 can be directly assembled, and the assembly direction is the radial direction of the front end shell 100 or the snake bone. Figures 6 to 9 As shown, the inner contour of the connecting groove 210 is set correspondingly to the outer contour of the connecting ear 300, and the contour shapes and sizes of the two are corresponding, so that the connecting ear 300 can be snapped into the connecting groove 210. The connecting ear 300 is configured to be inserted into the connecting groove 210 along the radial direction of the snake bone first section 200, so that the first stopper 310 and the second stopper 211 are matched at the axial upper limit of the front end shell 100.

[0039] It should be noted that under such a layout, the number of connecting ears 300 of the front end shell 100 should not be too many. There are two connecting ears 300, and the two connecting ears 300 need to be arranged along the radial direction of the front end shell 100, so that it can move along the radial direction of the snake bone first section 200 to insert the connecting ear 300 into the connecting groove 210.

[0040] In the process of assembling the front end shell 100 and the snake bone first section 200, the front end shell 100 and the snake bone first section 200 are firstly connected, so that the connecting ear 300 is located inside or outside the snake bone first section 200, and the connecting ear 300 and the connecting groove 210 are arranged along the radial direction of the snake bone first section 200. Figure 8 When the front end housing 100 has two connecting ears 300, one connecting ear 300 is located inside the first segment of the snake bone 200, and the other connecting ear 300 is located outside the first segment of the snake bone 200. Then the front end housing 100 is moved along the radial direction of the first segment of the snake bone 200. Figure 8The dotted arrow direction is the moving direction of the connecting ear 300. Insert the connecting ear 300 into the connecting groove 210 to complete the preliminary assembly of the front end shell 100 and the snake bone first section 200. Fig. 9 As shown, at this time, gluing can be performed along the contact portion between the connecting ear 300 and the connecting groove 210 to fix the positions of the front end shell 100 and the snake bone first section 200 .

[0041] In some preferred embodiments, the connection groove 210 has two second stoppers 211, which are located at the distal end of the connection groove 210, and the space of the connection groove 210 for accommodating the first stopper 310 is enlarged, and the axial dimension of the first stopper 310 can be adapted to increase, and its structural strength is improved, thereby improving the stopping effect of the first stopper 310 and the second stopper 211. In addition, the two second stoppers 211 are arranged along the circumference of the first segment 200 of the snake bone, so that the connection ear 300 is evenly stopped, and the position displacement of the front end shell 100 is avoided due to the uneven stopping effect of the second stopper 211.

[0042] The embodiment of the present application further provides an insertion portion, comprising an assembly structure of the front end shell 100 and the snake bone first section 200 provided in any of the above embodiments.

[0043] The present application also provides an endoscope, including the insertion portion provided in the above embodiment. The endoscope in the embodiment of the present application can be a bronchoscope, a pyeloscope, an esophagoscope, a gastroscope, an enteroscope, an otoscope, a rhinoscope, a stomatoscope, a laryngoscope, a colposcope, a laparoscope, an arthroscope, etc. The embodiment of the present application does not specifically limit the type of the endoscope.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A structure of a front end shell and a first section of a snake bone, characterized in that: It comprises a front end shell (100) and a snake bone first section (200) which are coaxially arranged, wherein the proximal opening of the front end shell (100) is a glue injection port, and the interior of the front end shell (100) is connected to the interior of the snake bone first section (200), forming an installation channel for endoscope instruments to pass through; The proximal end of the front end shell (100) has at least one connecting ear (300), and the connecting ear (300) is formed by a portion of the tube wall of the front end shell (100) protruding along its axial direction, and the wall thickness of the connecting ear (300) is less than or equal to the wall thickness of the front end shell (100), and the connecting ear (300) is fixedly connected to the snake bone first section (200).

2. The assembly structure of the front end shell and the first section of the snake bone according to claim 1 is characterized in that: The distal end of the snake bone first section (200) has at least one connecting groove (210), and the connecting groove (210) is formed by a portion of the tube wall of the snake bone first section (200) being recessed toward its proximal end. The connecting groove (210) and the connecting ear (300) are arranged in a one-to-one correspondence, and the connecting groove (210) is used to accommodate the connecting ear (300) so that the outer peripheral wall of the front end shell (100) and the outer peripheral wall of the snake bone first section (200) are arranged flush in the axial direction of the front end shell (100).

3. The assembly structure of the front end shell and the first section of the snake bone according to claim 2 is characterized in that: The connecting ear portion (300) has a first stop portion (310), and the first stop portion (310) is formed by a circumferential protrusion of the connecting ear portion (300) along the front end shell (100); The connecting groove (210) has a second stopper (211), and the second stopper (211) is formed by a groove wall of the connecting groove (210) protruding toward the inside of the connecting groove (210) along the circumference of the snake bone first section (200); When the connecting ear (300) is inserted into the connecting groove (210), the first stopper (310) can be located on the proximal side of the second stopper (211) to cooperate with the second stopper (211) at the axial upper limit position of the front end shell (100).

4. The assembly structure of the front end shell and the first section of the snake bone according to claim 3 is characterized in that: Along the circumference of the snake bone first section (200), the width of the portion of the connecting groove (210) where the second stopper (211) is provided is a first width, and along the circumference of the front end shell (100), the width of the portion of the connecting ear (300) where the first stopper (310) is provided is a second width; The first width is greater than or equal to the second width, so that the connecting ear (300) can be inserted into the connecting groove (210) along the axial direction of the snake bone first section (200), and the first stop portion (310) is configured to rotate along the circumference of the snake bone first section (200) to the proximal end of the second stop portion (211) to cooperate with the second stop portion (211) at the axial upper limit position of the front end shell (100).

5. The assembly structure of the front end shell and the first section of the snake bone according to claim 4, characterized in that: The surface of the second stop portion (211) used to abut against the first stop portion (310) is a stop surface (211a), and the stop surface (211a) is extended along the circumference of the snake bone first section (200).

6. The assembly structure of the front end shell and the first section of the snake bone according to claim 5, characterized in that: The stop surface (211a) is arranged perpendicularly to the groove wall of the adjacent connecting groove (210), and / or the stop surface (211a) is arranged perpendicularly to the surface of the adjacent second stop portion (211).

7. The assembly structure of the front end shell and the first section of the snake bone according to claim 3 is characterized in that: The inner contour of the connecting groove (210) is arranged to correspond to the outer contour of the connecting ear (300), and the connecting ear (300) is configured to be inserted into the connecting groove (210) along the radial direction of the snake bone first section (200) so that the first stop portion (310) and the second stop portion (211) cooperate at the axial upper limit position of the front end shell (100).

8. The assembly structure of the front end shell and the first section of the snake bone according to claim 7, characterized in that: The connecting groove (210) has two second stop portions (211), and the two second stop portions (211) are located at the distal end of the connecting groove (210) and are arranged along the circumference of the snake bone first section (200).

9. An insertion portion, characterized in that: The invention comprises the assembly structure described in any one of claims 1 to 8.

10. An endoscope, characterized in that: Comprising the insertion portion according to claim 9.

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