Traction cord, traction cord fixing structure, insertion portion, and endoscope

Abstract

The utility model discloses a kind of traction ropes, traction rope fixing structure, insertion part and endoscope.The traction rope is used for endoscope, including traction rope body, the distal end of the traction rope body is provided with auxiliary welding piece, the auxiliary welding piece has the welding surface for being welded with external fixed carrier, the width of the welding surface is greater than the diameter of traction rope body.The traction rope provided in the application, auxiliary welding piece is arranged at the distal end of traction rope, since auxiliary welding piece has the welding surface with width greater than the diameter of traction rope body, positioning is simpler;And, auxiliary welding piece also has solder function, can improve welding reliability, form stable connection structure, to ensure that force transmission is stable, enhance control accuracy and security.Meanwhile, without replacing welding equipment, with the advantage of low cost, and can be standardized design, facilitate industry popularization and mass production.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a traction rope, a traction rope fixing structure, an insertion part, and an endoscope. Background Technology

[0002] An endoscope is a medical device inserted into the body through cavities or minimally invasive incisions for observation, diagnosis, and treatment. Its core components include an insertion section, an operating section, and an image processing system. The traction cable is a key component for steering the insertion section. One end connects to the curved section at the front of the insertion section, and the other end passes through the insertion section's cavity and is fixed to a knob on the operating section. During operation, the doctor rotates the knob to pull or release the traction cable, causing the curved section to bend in a specific direction through tension, thus adjusting the lens's viewing angle. Therefore, the reliability of the traction cable connection is crucial. A loose connection can lead to steering failure, affecting operation and even damaging tissue; a breakage can leave the cable end trapped inside the body, causing infection. The reliability of its connection directly determines the safety and effectiveness of the endoscope.

[0003] However, the existing laser welding process for traction ropes has drawbacks such as high positioning difficulty and low welding reliability, which has become a key factor restricting the performance improvement of medical endoscope control systems.

[0004] There is an urgent need to develop a traction rope fixation technology that is easy to position and has a stable connection, in order to overcome the limitations of existing processes and meet the stringent requirements of medical devices for high precision and high reliability. Utility Model Content

[0005] This utility model discloses a traction rope, a traction rope fixing structure, an insertion part, and an endoscope to solve the technical problems of high positioning difficulty and low welding reliability in the welding of the distal end of the traction rope in related technologies.

[0006] To solve the above problems, the present invention adopts the following technical solution: In a first aspect, this application provides a traction rope for an endoscope, comprising a traction rope body, wherein an auxiliary welding member is provided at the distal end of the traction rope body, the auxiliary welding member having a welding surface for welding to an external fixed carrier, the width of the welding surface being greater than the diameter of the traction rope body.

[0007] Secondly, this application provides a traction rope fixing structure, including: The aforementioned endoscopic traction rope; The fixed carrier includes at least one of the following: the first serpentine segment of the active bending tube, the head end, and the adapter tube; The auxiliary welding component is fixed to at least one of the following fixed carriers: the first snake bone segment, the head end, and the transfer pipe.

[0008] Thirdly, this application provides an insertion part, including the aforementioned traction rope fixing structure.

[0009] Fourthly, this application provides an endoscope including the aforementioned insertion portion.

[0010] The technical solution adopted in this utility model can achieve the following beneficial effects: The traction rope provided in this application has an auxiliary welding component at its distal end. Because the auxiliary welding component has a welding surface wider than the diameter of the traction rope itself, positioning is simpler. Furthermore, the auxiliary welding component also functions as a welder, improving welding reliability and forming a stable connection structure, thereby ensuring stable force transmission and enhancing control precision and safety. Simultaneously, it eliminates the need to replace welding equipment, offering a low-cost advantage, and its standardized design facilitates industry promotion and mass production. Specifically, the advantages are as follows: (1) An auxiliary welding component is set at the far end of the traction rope body. Since the auxiliary welding component has a welding surface with a width greater than the diameter of the traction rope body, the alignment area between the auxiliary welding component and the external fixed carrier (first section of snake joint, head end or adapter pipe) is increased. Compared with the single-point contact of traditional small-diameter traction ropes, this structure can reduce the risk of positional deviation of the traction rope before welding by setting the auxiliary welding component, making the positioning process more convenient; at the same time, it avoids the tedious process of repeatedly adjusting the angle and position of the traction rope manually, significantly reducing the complexity of operation and reducing the dependence of operation on precise alignment.

[0011] (2) The auxiliary welding component also serves as a fusion strengthening agent for the weld. The auxiliary welding component can be made of a material compatible with the inner wall material of the traction rope and the fixed carrier (first section of the snake joint, head end, or adapter pipe) (such as stainless steel, alloy, etc.). During laser welding, it can act as a weld material, melting synchronously with the end of the traction rope and the inner wall of the fixed carrier (first section of the snake joint, head end, or adapter pipe) to form an integrated composite weld layer. Compared to the direct welding of the traction rope to the inner wall in traditional processes, this design significantly improves welding reliability through the following methods: ① First, the auxiliary welding component, acting as a welding material, can effectively fill the welding gap. During the laser melting process, the auxiliary welding component melts and evenly fills the gap between the traction rope and the fixed position, avoiding problems such as incomplete welding or missing welding caused by local lack of fusion, and making the connection interface denser.

[0012] Secondly, the auxiliary welding components can evenly distribute the welding thermal stress. During the welding process, the auxiliary welding components, the traction rope, and the fixed carrier (the first section of the snake bone joint, the head end, or the adapter pipe) form a synchronously fused whole, avoiding local overheating or stress concentration, reducing the risk of cracking or detachment of the weld interface due to thermal stress, and ensuring the long-term stability of the connection strength.

[0013] ③ Finally, the auxiliary welding component upgrades the traditional "line contact welding" to a welding mode of "increased contact area + solder filling". The larger contact area, combined with the filling effect of the solder, significantly improves the bonding strength of the welding layer, making the connection between the traction rope and the fixed position more stable and effectively reducing the risk of endoscope operation failure due to connection failure.

[0014] (3) The stable connection of the traction rope through auxiliary welding components can improve the performance and safety of the endoscope control system. First, the stable connection of the auxiliary welding components ensures the stability of force transmission when driving the snake bone to bend, avoiding loosening or detachment of the traction rope due to incomplete welding or missing welding in traditional processes. This improvement enhances the accuracy of bending drive, effectively controls the deviation of the snake bone bending angle, ensures that the endoscope turns as expected during diagnosis and treatment, and reduces the risk of tissue damage caused by control failure. Second, the auxiliary welding components significantly improve the reliability of the traction rope connection through mechanical structure reinforcement and welding quality optimization, meeting the high reliability requirements of medical devices. The improved fixation technology allows the traction rope to maintain stable connection strength during long-term use, meeting the high precision and high reliability standards of medical devices for key components, and reducing the potential for equipment failure during medical operations.

[0015] (4) An auxiliary welding component is set at the far end of the traction rope body. In the welding process, there is no need to replace the existing laser welding equipment. The process can be optimized by improving the structure of the traction rope. Enterprises can improve production quality without increasing equipment investment. It has the advantage of low cost and is easy to promote and apply in the industry.

[0016] (5) The structure of the auxiliary welding parts can be standardized according to the size of the fixed carrier (first section of snake bone joint, head end or adapter tube) of different endoscope models, such as the outer diameter of welding sleeves of different specifications, to meet the mass production needs of various product models and promote the development of medical endoscope control system towards modularization and standardization. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front view of Embodiment 1 of this application; Figure 2 This is a schematic diagram of the structure of Embodiment 1 of this application; Figure 3 This is a front view of another embodiment of Example 1 of this application; Figure 4 This is a schematic diagram of another embodiment of Example 1 of this application; Figure 5 This is a front view of yet another embodiment of Example 1 of this application; Figure 6 This is a schematic diagram of another embodiment of Example 1 of this application; Figure 7 This is a structural schematic diagram of another embodiment of Example 1 of this application; Figure 8 This is a schematic diagram of the active bending tube in an embodiment of this application; Figure 9 yes Figure 8 Sectional view of AA; Figure 10 This is a schematic diagram of another embodiment of the first segment of the snake bone in this application. Figure 11 This is a schematic diagram of the welding assembly of the traction rope body and the active bending tube in an embodiment of this application; Figure 12 yes Figure 10 Enlarged diagram of section B; Figure 13 This is a schematic diagram of the welding assembly of the traction rope body and the first snake bone segment in another embodiment of the present application. Figure 14 This is a schematic diagram of the structure in this application embodiment where a first alignment mark is set on the first segment of the serpentine bone; Figure 15 This is a schematic diagram of the structure in this application embodiment where a second alignment mark is set on the auxiliary welding component.

[0019] In the diagram: 10, traction rope body; 20, welding sleeve; 30, welding plate; 40, active bending tube; 401, first section of snake bone joint; 50, observation notch; 60, widened notch; 70, positioning groove; 80, first alignment mark; 90, second alignment mark. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0022] In the various embodiments of this application, "near end" and "far end" refer to the distance of each component from the user in the usage environment. The end closer to the user is designated as the "near end", and the end farther from the user is designated as the "far end".

[0023] To facilitate understanding of the traction rope, traction rope fixing structure, insertion part and endoscope provided in the embodiments of this application, the relevant technologies are first introduced below in conjunction with the application scenario.

[0024] Currently, the industry commonly uses laser welding technology to fix the endoscopic traction rope. Specifically, this involves welding from the outside in, fixing the distal end of the traction rope to the inner wall of the first segment 401 of the active bending tube 40, the inner wall of the head end, or the inner wall of the adapter connecting the first segment 401 and the head end. However, this process has several drawbacks: First, it requires precise alignment of the traction rope with the fixing carrier (first segment 401, head end, or adapter), making the operation cumbersome and demanding on the operator's skills, resulting in low production efficiency. Second, the outside-in welding method is susceptible to space constraints, leading to a high risk of traction rope displacement during welding, often resulting in unreliable issues such as incomplete welds or missed welds. This can cause malfunctions such as deviations in the endoscopic snake bending angle and control failure, seriously affecting the safety and accuracy of diagnostic and treatment procedures.

[0025] Therefore, this application provides a traction rope, a traction rope fixing structure, an insertion part, and an endoscope, which are described below in conjunction with... Figures 1-15 The technical solutions disclosed in the various embodiments of this application are described in detail.

[0026] Example 1: This application provides a traction rope for an endoscope, including a traction rope body 10, wherein an auxiliary welding member is provided at the distal end of the traction rope body 10, the auxiliary welding member having a welding surface for welding to an external fixed carrier, the width of the welding surface being greater than the diameter of the traction rope body 10.

[0027] In some embodiments, the auxiliary welding component includes a welding sleeve 20 fitted over the distal end of the traction rope body 10. It is understood that the welding sleeve 20, fitted over the distal end of the traction rope body 10 and having a larger outer diameter, directly increases the contact area during welding. Compared to traditional single-point alignment with a thin traction rope, this reduces pre-welding positional shifts, making positioning easier and eliminating the need for repeated angle adjustments. Furthermore, the larger contact base, combined with the welding material from the welding sleeve 20, further enhances the stability of the post-weld connection, structurally solving the problems of difficult positioning and low reliability in traditional welding.

[0028] In some embodiments, the sidewalls of the welding sleeve 20 are either closed or open. It is understood that both designs offer flexibility in production, and both retain the core advantages of the welding sleeve 20, such as increasing the welding area and facilitating solder filling. Please refer to... Figure 1 and Figure 2 The welded sleeve 20 is a closed structure; please refer to [link / reference]. Figure 3 and Figure 4 The welded sleeve 20 has an open structure.

[0029] In some embodiments, the welding sleeve 20 is a circular tube structure, and both the welding sleeve 20 and the traction rope body 10 are flattened together. It is understood that the circular tube structure facilitates the fitting of the traction rope body 10, and the subsequent flattening process further expands the welding surface, allowing for more thorough contact between the welding sleeve 20 and the fixing carrier. The flattened structure also enhances the tightness of the connection between the traction rope body 10 and the welding sleeve 20, resulting in more uniform heat transfer during welding and reducing localized stress concentration. This improves welding strength and reduces the risk of cracking or detachment during subsequent use, while also simplifying the processing steps and incurring no additional costs. When the welding sleeve 20 is a circular tube structure, after flattening, its cross-section is usually elongated or approximately elliptical. Therefore, its welding surface is a plane or arc surface near the external fixed carrier. When the welding surface is a plane near the external fixed carrier, the width of the welding surface refers to the width of the plane (the dimension perpendicular to the axial direction of the traction rope body 10). When the welding surface is an arc surface near the external fixed carrier, the width of the welding surface refers to the arc length of the cross-sectional profile of the arc surface. The length of the welding sleeve 20 refers to the straight-line extension distance of the welding sleeve 20 along the axial direction of the traction rope body 10 (i.e., the longitudinal dimension of the welding sleeve 20).

[0030] In some embodiments, the welding sleeve 20 is a flat tube structure, and the welding sleeve 20 is connected to the distal end of the traction rope body 10. It is understood that the flat tube structure itself has a large welding contact area, eliminating the need for additional flattening and simplifying the processing flow. After the flat tube structure is connected to the distal end of the traction rope body 10, it can quickly achieve precise alignment with the fixed carrier, reducing positioning and adjustment time; at the same time, the contact surface of the flat tube structure allows for more uniform solder filling, further improving the weld density, ensuring a stable connection, and meeting the needs of mass production. When the welding sleeve 20 is a flat tube structure, it can be a rectangular flat tube, an elliptical flat tube, etc. When a rectangular flat tube is used, its welding surface is the plane on the side closer to the external fixed carrier, and the width of the welding surface refers to the length of the long side of the cross-section of the welding sleeve 20. When an elliptical flat tube is used, its welding surface is the arc surface on the side closer to the external fixed carrier, and the width of the welding surface refers to the arc length of the cross-sectional profile of the arc surface. The length of the welding sleeve 20 refers to the straight-line extension distance of the welding sleeve 20 along the axial direction of the traction rope body 10 (i.e., the longitudinal dimension of the welding sleeve 20).

[0031] In some embodiments, the welding sleeve 20 is made of any one of 304 stainless steel, 316 stainless steel, nickel-based alloys, and titanium alloys. It is understood that these materials are highly compatible with the materials of the traction rope body 10 and the fixing carrier, allowing for simultaneous melting during welding to form a robust composite weld layer. The materials themselves possess high strength and corrosion resistance, meeting the stringent requirements of medical endoscopes for component stability and safety, while also being compatible with laser welding processes. This prevents incomplete or missed welds due to material incompatibility, ensuring reliable connections during long-term use and meeting medical device standards.

[0032] In some embodiments, the auxiliary welding component includes a welding plate 30 fixedly connected to the distal end of the traction rope body 10. It is understood that the welding plate 30 is fixed to the distal end of the traction rope body 10, and its welding surface width is larger than the diameter of the traction rope body 10, directly increasing the welding contact area. Compared to the point contact welding of traditional thin traction ropes, this simplifies pre-welding positioning, eliminating the need for repeated calibration; it also improves welding strength through a larger bonding surface. Combined with the solder effect of the welding plate 30, it reduces problems such as incomplete welds and weld failures, making the connection between the traction rope body 10 and the fixed carrier more stable, further addressing the pain points of traditional processes. Please refer to [link to relevant documentation]. Figure 6 The welding plate 30 is a rectangular plate, and its welding surface is a rectangular plane. The width of the welding surface refers to the width of the rectangular plane, that is, the short side dimension of the welding plate 30; the length of the welding plate 30 refers to the dimension of the parallel extension along the axial direction of the traction rope body 10, that is, the long side dimension of the welding plate 30.

[0033] Please see Figure 7In some embodiments, the welding plate 30 is an arc-shaped plate adapted to the external fixing carrier. It is understood that the arc-shaped plate design allows for perfect contact with the surface of the external fixing carrier, significantly improving the tightness of the fit during welding. Improved fit not only results in more precise positioning but also allows for more even heat transfer during welding, avoiding localized stress concentration. Simultaneously, the solder can fill the gaps more evenly, forming a denser weld layer, further enhancing connection stability and adapting to the needs of fixing carriers of different shapes. When the welding plate 30 is an arc-shaped plate, its welding surface is an arc surface, and the width of the welding surface refers to the arc length of the arc-shaped plate's cross-sectional profile; the length of the welding plate 30 refers to the straight-line extension distance of the arc-shaped plate along the axial direction of the traction rope body 10, parallel to the axial direction of the traction rope body 10.

[0034] In some embodiments, the welding plate 30 is made of any one of 304 stainless steel, 316 stainless steel, nickel-based alloys, and titanium alloys. It is understood that these materials have good compatibility with the traction rope body 10 and the fixing carrier, and can melt synchronously during welding to form a strong, integrated weld layer. The materials themselves are high in strength and corrosion-resistant, meeting the stability requirements for long-term use of medical endoscopes, and are also compatible with laser welding processes. Welding defects will not occur due to material incompatibility, fully meeting the stringent standards for high precision and high reliability in medical devices.

[0035] In some embodiments, the width of the welding surface of the auxiliary welding component is 1.5-5 times the diameter of the traction rope body 10. It is understood that this size range ensures a sufficiently large welding contact area to effectively distribute welding stress and prevent localized overheating and cracking; while avoiding assembly interference due to excessive size, thus fitting the compact spatial layout inside the endoscope. Compared to traditional small-diameter traction ropes, this significantly improves welding reliability while maintaining structural practicality, balancing connection strength and assembly feasibility.

[0036] In some embodiments, the auxiliary welding component extends 5-20 mm along the axial direction of the traction rope body 10. It is understood that this length design ensures stability during welding, avoids stress concentration due to an excessively short welding area, and reduces the risk of weld failure during long-term use. Simultaneously, this length adapts to the assembly requirements of different endoscopes, does not occupy excessive internal space, and allows for a more secure connection between the traction rope body 10 and the auxiliary welding component, ensuring stable force transmission and balancing practicality and adaptability.

[0037] In some embodiments, the welding plate 30 is connected to the distal end of the traction rope body 10 by welding, bonding, or mechanical fixing. Of course, other connection methods can also be used.

[0038] Example 2: This application provides a traction rope fixing structure, including: The traction rope in Example 1; The fixed carrier includes at least one of the following: the first segment 401 of the active bending tube 40, the head end, and the adapter tube; The auxiliary welding component is fixed to at least one of the following fixed carriers: the first snake bone segment 401, the head end, and the adapter pipe.

[0039] In some embodiments, the traction rope fixing structure further includes an alignment structure for positioning the auxiliary weldment.

[0040] Please see Figure 10 In some embodiments, the alignment structure includes: a positioning groove 70 provided on the inner wall of at least one of the fixing carriers, namely the first snake joint 401, the head end, and the adapter pipe, wherein the shape of the positioning groove 70 is adapted to the auxiliary welding component. It is understood that providing the positioning groove 70 enables rapid positioning of the auxiliary welding component. Taking the fixing of the first snake joint 401 as an example, the positioning groove 70 can be pre-processed into a groove matching the auxiliary welding component. During installation, there is no need to repeatedly adjust the position of the traction rope; positioning can be completed simply by embedding it, significantly reducing the technical dependence of the assembly on the operator and avoiding welding offset problems caused by human alignment errors. Please see Figure 14 and Figure 15 In some embodiments, the alignment structure includes: a first alignment mark 80 provided on the outer wall of at least one of the fixing carriers in the first segment 401, the head end, and the adapter pipe; and a second alignment mark 90 provided on the auxiliary welding component. The first alignment mark 80 and the second alignment mark 90 match each other for visual or mechanical alignment. It is understood that, for example, if the first alignment mark 80 and the second alignment mark 90 are visually aligned, during assembly, the operator only needs to align the two marks to ensure that the auxiliary welding component is in the correct welding position, without the need for complex measuring tools or reliance on experience. For example, an arrow can be engraved on the first segment 401 as the first alignment mark 80, and a similar arrow can be sprayed on the corresponding position of the auxiliary welding component as the second alignment mark 90. ​​During assembly, simply overlapping the two arrows ensures the accurate relative position of the traction rope auxiliary welding component and the inner wall of the first segment 401. Of course, the arrow marks are only exemplary; any identical marks can be used as alignment marks. This marking and alignment method significantly reduces the skill requirements for operators, while enabling rapid and standardized assembly in mass production. It effectively reduces positioning errors caused by human factors and ensures the stability and consistency of product quality.

[0041] Please see Figure 8 , Figure 9 , Figure 11 and Figure 12In some embodiments, the alignment structure includes an observation notch 50 for observing the position of the auxiliary weldment on at least one of the following fixed carriers: the first segment 401, the head end, and the adapter pipe. The observation notch 50 extends axially along the fixed carrier. It is understood that the observation notch 50 provides a visual channel for the welding process. For example, during welding of the first segment 401, the operator can observe the alignment of the auxiliary weldment with the first segment 401 in real time through the observation notch 50 to confirm the accuracy of the welding position; after welding, the operator can also visually inspect the uniformity of the weld layer, avoiding problems such as incomplete welds or missed welds.

[0042] Please see Figure 13 In some embodiments, the observation notch 50 is adapted to the outer contour of the auxiliary welding component, which is embedded within the observation notch 50. It is understood that when the auxiliary welding component is embedded within the adapted observation notch 50, a dual guarantee of "mechanical interlocking + visual verification" is formed. Because the contour of the observation notch 50 is adapted to the shape of the auxiliary welding component, the accuracy of positioning can be determined by observing whether there are gaps at the edges during embedding. If there are no gaps, welding can be performed directly. This design transforms "positioning accuracy" into a visible structural feature, while simultaneously improving assembly efficiency and connection strength.

[0043] In some embodiments, a widened notch 60 is provided on the observation notch 50, extending circumferentially along at least one of the fixing carriers in the first segment 401, the head end, and the transfer tube. It is understood that providing the widened notch 60 can further improve the accuracy and speed of alignment; for example, aligning one side of the auxiliary welding component with the end of the widened notch 60 indicates that the auxiliary welding component is exactly in the target position. Simultaneously, the widened notch 60 can be completed in the same process as the observation notch 50, for example, by stamping to simultaneously form the widened notch 60 of the observation notch 50.

[0044] Example 3: This application provides an insertion part, including the traction rope fixing structure described in Embodiment 2.

[0045] Example 4: This application provides an endoscope, including the insertion portion described in Embodiment 3.

[0046] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A traction rope for an endoscope, comprising a traction rope body, characterized in that, An auxiliary welding component is provided at the distal end of the traction rope body. The auxiliary welding component has a welding surface for welding with an external fixed carrier, and the width of the welding surface is greater than the diameter of the traction rope body.

2. The traction rope according to claim 1, characterized in that, The auxiliary welding component includes a welding sleeve fitted onto the outer side of the distal end of the traction rope body; And / or, the auxiliary welding component includes a welding plate fixedly connected to the distal end of the traction rope body.

3. The traction rope according to claim 2, characterized in that, The sidewall of the welded sleeve is either a closed structure or an open structure; And / or, the material of the welded sleeve is selected from any one of 304 stainless steel, 316 stainless steel, nickel-based alloys and titanium alloys; And / or, the welding plate is an arc-shaped plate adapted to an external fixed carrier; And / or, the material of the welding plate is selected from any one of 304 stainless steel, 316 stainless steel, nickel-based alloys and titanium alloys.

4. The traction rope according to claim 3, characterized in that, The width of the welding surface of the auxiliary welding component is 1.5-5 times the diameter of the traction rope body; The auxiliary welding component extends 5-20 mm along the axial direction of the traction rope body. The welded sleeve is a round tube structure, and the welded sleeve and the traction rope body are both flattened; or, the welded sleeve is a flat tube structure, and the welded sleeve is connected to the far end of the traction rope body.

5. A traction rope fixing structure, characterized in that, include: The traction rope for an endoscope as described in any one of claims 1-4; The fixed carrier includes at least one of the following: the first serpentine segment of the active bending tube, the head end, and the adapter tube; The auxiliary welding component is fixed to at least one of the following fixed carriers: the first snake bone segment, the head end, and the transfer pipe.

6. The traction rope fixing structure according to claim 5, characterized in that, The traction rope fixing structure also includes an alignment structure for positioning the auxiliary welded parts.

7. The traction rope fixing structure according to claim 6, characterized in that, The alignment structure includes: a positioning groove is provided on the inner wall of at least one of the first segment of the snake bone joint, the head end, and the transfer tube, and the shape of the positioning groove is adapted to the auxiliary welding component; Alternatively, the alignment structure includes: setting a first alignment mark on at least one of the first serpentine segment, the head end, and the transfer tube on a fixing carrier, and setting a second alignment mark on the auxiliary welding part, wherein the first alignment mark and the second alignment mark match each other for visual or mechanical alignment; Alternatively, the alignment structure includes: an observation notch for observing the position of the auxiliary weldment is provided on at least one of the first serpentine segment, the head end, and the adapter pipe, the observation notch extending along the axial direction of the fixed carrier.

8. The traction rope fixing structure according to claim 7, characterized in that, The observation notch is adapted to the outer contour of the auxiliary welding component, and the auxiliary welding component is embedded in the observation notch; Alternatively, a widened notch may be provided on the observation notch, extending circumferentially along at least one of the fixed carriers, including the first segment of the snake bone joint, the head end, and the transfer tube.

9. An insertion part, characterized in that, Includes the traction rope fixing structure as described in any one of claims 5-8.

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

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