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, the near end side of the front end shell is provided with at least one connecting lug part arranged in the axial direction of the front end shell in a protruding mode, the surface, making contact with the connecting lug parts, of the snake bone head section is provided with at least one first welding part, and the first welding parts correspond to the connecting lug parts one to one; the first welding part is used for being welded to the connecting lug part. The protruding connecting lug part is arranged on the near end side of the front end shell, so that in the process of injecting glue into the front end shell, redundant glue liquid can overflow from the position, not provided with the connecting lug part, of the near end of the front end shell, the glue liquid is prevented from overflowing to the connecting lug part, a clean environment is provided for the connecting lug part, and the service life of the glue liquid is prolonged. The welding quality of the connecting lug part and the first welding part is improved and optimized, the connecting stability of the connecting lug part and the first welding part is improved, and shaking between the connecting lug part and the first welding part is avoided.

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 along with 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, and after the injection of glue, the front-end shell of the front-end component and the first section of the serpentine segment are welded to connect the front-end shell and the first section of the serpentine. However, in actual use, the welding structure of the front-end shell and the first section of the serpentine is not stable, and shaking is likely to occur between the two. 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 head section, comprising a coaxially arranged front end shell and a serpentine head section, the proximal side of the front end shell having at least one connecting ear protruding along its axial direction, the surface of the serpentine head section in contact with the connecting ear being provided with at least one first welding portion, the first welding portion corresponding one-to-one to the connecting ear, and the first welding portion being used for welding to the connecting ear.

[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, a protruding connecting ear is provided on the proximal side of the front end shell, so that in the process of injecting glue into the front end shell, excess glue can overflow from the position of the proximal end of the front end shell where the connecting ear is not provided, thereby preventing the glue from overflowing to the connecting ear, thereby preventing the glue from contaminating the connecting ear, providing a clean environment for the connecting ear, thereby improving and optimizing the welding quality of the connecting ear and the first welding part, improving the connection stability between the two, and avoiding shaking between the two. 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 separation 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 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 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 ;

[0016] Figure 5 This is a schematic diagram of the separation of the front end shell and the first section of the snake bone provided in some embodiments of the present application Figure 2 ;

[0017] Figure 6 This is a schematic diagram of the assembly 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 It 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.

[0019] In the figure: 100-front end shell, 110-connecting ear, 120-first through hole, 200-snake bone first section, 210-first welding part, 220-positioning groove, 230-second through hole, 240-second welding part, 300-snake bone section, 400-pivot center, 500-traction rope. DETAILED DESCRIPTION

[0020] 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.

[0021] 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".

[0022] 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, since the size of the first section of the snake bone is relatively small, the size of the glue injection port set on the first section of the snake bone is even smaller. If the glue injection port is too small, the glue injection speed will be slow, causing the glue to flow 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 will have insufficient glue. The excess glue on the side of the front end shell where there is sufficient glue will also overflow from the connection position between the front end shell and the first section of the snake bone, causing pollution to the connection between the two. When the front end shell and the first section of the snake bone are subsequently welded, the presence of the glue will directly affect the welding quality of the front end shell and the first section of the snake bone, resulting in an unstable connection between the two.

[0023] In view of this, an embodiment of the present application provides an assembly structure of a front end shell and a snake bone first section, by setting a protruding connecting ear 110 on the proximal side of the front end shell 100, thereby preventing the glue in the front end shell 100 from contaminating the connecting ear 110, thereby optimizing the welding quality between the connecting ear 110 and the snake bone first section 200.

[0024] The assembly structure provided in the embodiment of the present application includes a front end shell 100 and a snake bone first section 200 arranged coaxially. Both the front end shell 100 and the snake bone first section 200 are roughly cylindrical structures, hollow inside and open at both ends, forming a use channel for instrument tubes, light guide fibers, etc. to pass through. The front end shell 100 is the shell of the front end component in the endoscope, and devices such as a camera and a lighting module are installed inside. The snake bone first section 200 is a snake bone section 300 located at the distal end of the snake bone section of the insertion part of the endoscope and used to fix with the front end component. The snake bone section can be a riveted snake bone structure, and the snake bone section includes a plurality of snake bone sections 300 arranged in sequence, and two adjacent snake bone sections 300 are connected by a pivot center 400, and the two adjacent snake bone sections 300 are rotated by the pivot center 400, and the snake bone section 300 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 500 .

[0025] The proximal side of the front end shell 100 has at least one connecting ear 110 arranged along its axial protrusion, and the surface of the snake bone first section 200 that contacts the connecting ear 110 is provided with at least one first welding portion 210. The first welding portion 210 corresponds to the connecting ear 110 one by one, and one first welding portion 210 corresponds to one connecting ear 110. The first welding portion 210 is used to weld with the connecting ear 110, so that the front end shell 100 and the snake bone first section 200 are fixed.

[0026] During the assembly process of the front end shell 100 and the snake bone first section 200, since the protruding connecting ear 110 is provided on the proximal side of the front end shell 100, during the process of injecting glue into the front end shell 100, even if there is too much glue, some of the excess glue overflows from the proximal side of the front end shell 100, but since the connecting ear 110 is protruding, the overflowed glue cannot overflow to the position where the connecting ear 110 is located, and can only overflow from the position of the proximal end of the front end shell 100 where the connecting ear 110 is not provided, which can prevent the overflowed glue from contaminating the connecting ear 110, thereby providing a clean environment for the connecting ear 110, and when welding the first welding portion 210 and the connecting ear 110, the glue will not affect the welding process and welding quality, and the clean connecting ear 110 can optimize the welding quality between the connecting ear 110 and the snake bone first section 200.

[0027] In some embodiments, the proximal opening of the front end shell 100 can be set as the glue injection port of the front end shell 100, and glue is injected into the front end shell 100 before the front end shell 100 and the first section of the snake bone 200 are connected. 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, by using the proximal opening of the front end shell 100 as the glue injection port, the size of the glue injection port is enlarged, the syringe is easy to align with the glue injection port, the operating space of the glue injection is sufficient, and the difficulty of glue injection is reduced. In addition, since the size of the glue injection port is large and the glue injection flow rate is fast, 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, thereby improving the glue injection quality.

[0028] After the front end shell 100 is filled with glue, excess glue overflows from the proximal end of the front end shell 100, and the glue will not cause pollution to the connecting ear 110. After the glue in the front end shell 100 solidifies, the connecting ear 110 is welded to the first welding part 210 to fix the front end shell 100 and the snake bone first section 200.

[0029] The first welding portion 210 is a preset portion on the serpentine first section 200 for welding with the connecting ear 110. The connecting ear 110 is provided with a welding area corresponding to the first welding portion 210. Before welding the connecting ear 110 and the serpentine first section 200, it is necessary to align the first welding portion 210 with the welding area of ​​the connecting ear 110 to position the serpentine first section 200 and the front end shell 100 to avoid the installation position between the serpentine first section 200 and the front end shell 100 being too deep or the circumferential misalignment between the two, and to avoid the situation where the instrument channel in the insertion part and other components cannot be installed due to an inappropriate installation position.

[0030] The connecting ear 110 may be directly formed by the side wall protrusion of the front end shell 100, and the connecting ear 110 and the front end shell 100 may be integrally formed, or may be a structure additionally fixed to the front end shell 100. In the case where the connecting ear 110 is additionally fixed to the front end shell 100, since the front end shell 100 is fixed to the snake bone first section 200 through the connecting ear 110, in order to ensure the connection stability between the front end shell 100 and the connecting ear 110, the connecting ear 110 is generally fixed to the inner peripheral wall or the outer peripheral wall of the front end shell 100 to increase the contact area between the two.

[0031] There are generally three ways to connect the snake bone first section 200 and the front end shell 100. One is that part of the snake bone first section 200 is inserted into the front end shell 100, one is that part of the front end shell 100 is inserted into the snake bone first section 200, and the other is that the proximal end face of the front end shell 100 is abutted against the distal end face of the snake bone first section 200.

[0032] In some embodiments, part of the snake bone first section 200 is inserted into the front end shell 100, and the inner peripheral wall of the connecting ear 110 is fitted with the outer peripheral wall of the snake bone first section 200, and the two are in surface contact. Figures 1 to 3 The first welding portion 210 is located on the outer peripheral wall of the first segment of the snake bone 200 to correspond to the connecting ear portion 110. The connecting ear portion 110 is located outside the first segment of the snake bone 200, which is convenient for the operator to observe and adjust the position of the connecting ear portion 110 relative to the first welding portion 210 during the process of assembling the front end shell 100 and the first segment of the snake bone 200, so that the connecting ear portion 110 is aligned with the first welding portion 210.

[0033] In other embodiments, the distal end face of the serpentine first section 200 directly abuts against the proximal end face of the front end shell 100. Since a protruding connecting ear portion 110 is provided on the proximal side of the front end shell 100, the side wall on the distal side of the serpentine first section 200 has a structure corresponding to the connecting ear portion 110. Specifically, the tube wall of the serpentine first section 200 has at least one positioning groove 220 recessed toward its proximal end, and the positioning groove 220 is provided in a one-to-one correspondence with the connecting ear portion 110. The positioning groove 220 is used to accommodate the connecting ear portion 110 so that the distal end face of the serpentine first section 200 can abut against the proximal end face of the front end shell 100, and the groove bottom of the positioning groove 220 abuts against the proximal end face of the connecting ear portion 110, and the two are in surface contact and fit, and the first welding portion 210 is provided on the groove wall of the positioning groove 220, refer to Figures 4 to 6 Preferably, the first welding portion 210 is located at the bottom of the positioning groove 220 to improve the welding stability of the connecting ear portion 110 and the snake bone first section 200.

[0034] In such a layout, the axial installation position and the circumferential installation position between the front end shell 100 and the first section of the snake bone 200 can be directly positioned by inserting the connecting ear 110 into the positioning groove 220. In addition, since the positioning groove 220 can accommodate the connecting ear 110, it can be avoided that the connecting ear 110 protrudes from the outer peripheral wall of the first section of the snake bone 200. In the case where the connecting ear 110 and the front end shell 100 are integrally formed, the outer peripheral wall of the front end shell 100 can be flush with the outer peripheral wall of the first section of the snake bone 200, which is convenient for the subsequent covering of the skin outside the insertion part.

[0035] In some specific embodiments of the present application, the first welding portion 210 generally includes a plurality of welding points, and the plurality of welding points are distributed along the circumference of the first segment of the snake bone 200. Figure 2As shown, the connecting ear 110 is fixed and stabilized with the snake bone first section 200. After the snake bone first section 200 and the front end shell 100 are fixed, the two need to be stably coaxial to ensure that the two can move synchronously under the drive of the traction rope 500. Therefore, multiple welding points of the first welding part 210 are arranged to be distributed along the circumference of the snake bone first section 200, thereby increasing the contact range of the two in the circumferential direction and avoiding the two from being separated, tilted, or offset.

[0036] Since the portion of the front end shell 100 that is not provided with the connecting ear 110 at the proximal end is used for the excess glue in the front end shell 100 to overflow, in order to further prevent the glue in the front end shell 100 from overflowing to the connecting ear 110, it is necessary to limit the size of the connecting ear 110. In some embodiments, the front end shell 100 has only one connecting ear 110, then in the circumferential direction of the front end shell 100, the space between the two edges of the connecting ear 110 is the glue overflow notch of the front end shell 100, and the central angle corresponding to the connecting ear 110 is less than 180 degrees, so that the central angle corresponding to the glue overflow notch of the front end shell 100 is greater than 180 degrees, thereby ensuring that the probability of the glue overflowing from the front end shell 100 is greater than the probability of the glue overflowing to the connecting ear 110, and ensuring that a clean environment is provided for the connecting ear 110.

[0037] In other embodiments, the front end shell 100 has at least two connecting ears 110, and the space between the two connecting ears 110 is the glue overflow gap of the front end shell 100. Along the circumference of the front end shell 100, the length of the connecting ear 110 is less than the length of the gap between two adjacent connecting ears 110, that is, the length of the connecting ear 110 is less than the length of the glue overflow gap. The size of the glue overflow gap is large, and the glue overflow speed is fast, thereby preventing the glue from overflowing to the connecting ear 110, ensuring that a clean environment is provided for the connecting ear 110.

[0038] The circumferential installation position and axial installation position between the first section of the serpentine bone 200 and the front end shell 100 are preset in advance. In some embodiments of the present application, a positioning structure is provided between the first section of the serpentine bone 200 and the front end shell 100, so as to facilitate the operator to assemble the front end shell 100 and the first section of the serpentine bone 200 in place at one time. Specifically, the first section of the serpentine bone 200 is provided with a first positioning structure, and the front end shell 100 is provided with a second positioning structure. The first positioning structure can cooperate with the second positioning structure to position and install the front end shell 100 and the first section of the serpentine bone 200, so that the first welding portion 210 located at the first section of the serpentine bone 200 contacts the corresponding welding position of the connecting ear 110, and both are installed in place.

[0039] The cooperation between the first positioning structure and the second positioning structure can be a positioning cooperation determined by observation, for example, both the front end shell 100 and the first section of the snake bone 200 are provided with positioning marks, and the operator can observe and determine whether the two positioning marks are aligned to determine whether the front end shell 100 and the first section of the snake bone 200 are installed in place. The cooperation between the two positioning structures can also be achieved by the cooperation of mechanical parts, such as the cooperation of a protrusion and a groove. When the protrusion is inserted into the groove, it means that both are installed in place.

[0040] In some specific embodiments, when the first segment of the snake bone 200 is inserted into the front end shell 100, the second positioning structure is a first through hole 120 provided on the tube wall of the front end shell 100, and the first positioning structure is a second through hole 230 provided on the tube wall of the first segment of the snake bone 200, referring to Figures 1 to 3 As shown. During the assembly process of the front end shell 100 and the first section of the snake bone 200, it is possible to determine whether the front end shell 100 and the first section of the snake bone 200 are installed in place by observing whether the first through hole 120 and the second through hole 230 are coaxially arranged. In some preferred embodiments, the radial dimension of the first through hole 120 is greater than the radial dimension of the second through hole 230, so that it is easy to observe through the first through hole 120 whether the second through hole 230 is located at the center of the first through hole 120.

[0041] In other embodiments, when the snake bone first section 200 is inserted into the front end shell 100, the first positioning structure can be one of the positioning grooves or the positioning protrusions, and the second positioning structure can be the other of the positioning grooves or the positioning protrusions. The positioning grooves and the positioning protrusions are respectively located at the surfaces connecting the front end shell 100 and the snake bone first section 200 that are arranged opposite to each other, so that the positioning protrusion can be snapped into the positioning groove 220, and the operator can judge whether the snake bone first section 200 and the front end shell 100 are installed in place by the change of the operating feel. The positioning groove can be set on the front end shell 100, and the positioning groove is set to pass through the tube wall of the front end shell 100. Under such a layout, the operator can also judge whether the positioning protrusion is snapped into the positioning groove 220 by naked eyes.

[0042] In other embodiments of the present application, when the distal end face of the snake bone first section 200 is in surface contact with the proximal end face of the front end shell 100, in order to accommodate the connecting ear portion 110 of the front end shell 100, the tube wall of the snake bone first section 200 is recessed toward its proximal end to form a positioning groove 220, and the positioning groove 220 serves as a first positioning structure, and the connecting ear portion 110 of the front end shell 100 serves as a second positioning structure, Figures 4 to 6 By inserting the connecting ear 110 into the positioning groove 220, the front end shell 100 and the snake bone first section 200 are positioned and matched.

[0043] The overall structure of the front end shell 100 and the first snake bone section 200 is bent by the traction of the traction rope 500. The distal end of the traction rope 500 is usually fixed to the inner wall of the first snake bone section 200, thereby controlling the position of all snake bones in the snake bone section of the insertion part. In some embodiments of the present application, the traction rope 500 is welded and fixed to the first snake bone section 200. The first snake bone section 200 has a second welding portion 240, which is used to be welded with the traction rope 500 of the endoscope.

[0044] The welding connection method can improve the connection stability between the traction rope 500 and the snake bone first section 200; and, since the subsequent front end shell 100 and the snake bone first section 200 are also connected by welding, setting the traction rope 500 and the snake bone first section 200 to be welded can reduce the assembly process and improve the assembly efficiency.

[0045] The second welding part 240 and the first welding part 210 need to be staggered to avoid secondary welding at the same position of the snake bone first section 200, thereby affecting the connection stability between the snake bone first section 200 and the front end shell 100, or the connection stability between the snake bone first section 200 and the traction rope 500. The second welding part 240 needs to be set on the surface of the snake bone first section 200 where the first welding part 210 is not set. Figure 7 As shown, the first welding portion 210 is avoided to prevent the two welding portions from overlapping. Figure 7 In the embodiment, since the second welding portion 240 is blocked by the traction rope 500, Figure 7 The second welding part 240 shown in the figure is an approximate position and is indicated by a dotted line. The first welding part 210 and the second welding part 240 can be staggered in the circumferential direction of the first section of the snake bone 200, or staggered in the axial direction of the first section of the snake bone 200, or staggered in the circumferential direction and axial direction at the same time, which is not specifically limited in the embodiments of the present application.

[0046] 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.

[0047] 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.

[0048] 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; The proximal side of the front end shell (100) has at least one connecting ear (110) protruding along its axial direction, and the surface of the snake bone first section (200) in contact with the connecting ear (110) is provided with at least one first welding portion (210), and the first welding portion (210) corresponds to the connecting ear (110) one by one, and the first welding portion (210) is used for welding with the connecting ear (110).

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: A portion of the snake bone first section (200) is inserted into the front end shell (100), the outer peripheral wall of the snake bone first section (200) is in contact with the inner peripheral wall of the connecting ear (110), and the first welding part (210) is arranged on the outer peripheral wall of the snake bone first section (200); Alternatively, the tube wall of the snake bone first section (200) has at least one positioning groove (220) recessed toward its proximal end, and the positioning groove (220) is used to accommodate the connecting ear (110). The groove wall of the positioning groove (220) is in surface contact with the proximal end surface of the connecting ear (110), and the first welding portion (210) is located on the groove wall of the positioning groove (220).

3. The assembly structure of the front end shell and the first section of the snake bone according to claim 1, characterized in that: When the front end shell (100) has one connecting ear (110), the central angle of the connecting ear (110) is less than 180 degrees; when the front end shell (100) has at least two connecting ear portions (110), along the circumferential direction of the front end shell (100), the length of the connecting ear portion (110) is less than the length of the gap between two adjacent connecting ear portions (110); And / or, the first welding portion (210) has a plurality of welding points arranged along the circumference of the snake bone first section (200).

4. 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 snake bone first section (200) is provided with a first positioning structure, and the front end shell (100) is provided with a second positioning structure, and the first positioning structure can cooperate with the second positioning structure to position and install the front end shell (100) and the snake bone first section (200), so that the first welding part (210) located at the snake bone first section (200) contacts the corresponding welding position of the connecting ear (110).

5. The assembly structure of the front end shell and the first section of the snake bone according to claim 4, characterized in that: When the snake bone first section (200) is inserted into the front end shell (100), the second positioning structure is a first through hole (120) provided on the tube wall of the front end shell (100), the first positioning structure is a second through hole (230) provided on the tube wall of the snake bone first section (200), the first through hole (120) can be coaxially matched with the second through hole (230), or one of the first positioning structure and the second positioning structure is a positioning groove, and the other is a positioning protrusion, and the positioning protrusion can be snapped into the positioning groove; When the distal end face of the snake bone first section (200) is in surface contact with the proximal end face of the front end shell (100), the first positioning structure is a positioning groove (220) formed by the tube wall of the snake bone first section (200) being recessed toward its proximal end, and the second positioning structure is the connecting ear (110), and the connecting ear (110) can be inserted into the positioning groove (220).

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 radial dimension of the first through hole (120) is greater than the radial dimension of the second through hole (230).

7. The assembly structure of the front end shell and the first section of the snake bone according to claim 1, characterized in that: The snake bone first section (200) has a second welding portion (240), and the second welding portion (240) is used for welding with a traction rope (500) of an endoscope.

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 second welding portion (240) is located on the surface of the snake bone first section (200) where the first welding portion (210) is not provided, so as to avoid the first welding portion (210).

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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