Active bending section and endoscope

Abstract

The invention discloses an active bending section and an endoscope, and relates to the technical field of medical instruments.The active bending section comprises a snake bone and a flat wire, the snake bone comprises a snake bone first section, the outer wall of the snake bone first section is concaved inwards to form a connecting part, a through hole is formed in the snake bone first section, the through hole and the connecting part are correspondingly arranged, the flat wire is arranged in the snake bone first section in a penetrating mode, and the flat wire is provided with a bending part; the bending part extends out of the through hole and is attached to and connected with the connecting part. The bent part and the connecting part are attached to each other and connected, the connecting area between the flat wire and the snake bone head section is increased through the connecting part and the bent part, and the flat wire and the snake bone head section can receive force from all directions. By means of the design, stress can be better dispersed when the structure is subjected to multidirectional loads, and therefore the overall stability and bearing capacity are improved. Moreover, the through hole is formed in the snake bone head section, so that the connection position between the snake bone head section and the flat wire can be adjusted from the snake bone inner wall in the prior art to the snake bone outer wall, and the assembly efficiency of the active bending section is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an active bending section and an endoscope. Background Art

[0002] An endoscope is a medical device that inserts an insertion part into the human body and observes the internal tissues of the human body through a camera module at the far end of the insertion part. It can help doctors determine the location of lesions in the patient's body and the tissue structure characteristics of the lesion location. An endoscope includes a handle and an insertion part. In actual operation, the traction wheel is driven to rotate by turning the lever on the handle, and the traction wheel drives the traction rope to adjust the posture of the curved section of the insertion part, thereby adjusting the direction of the camera module and realizing functions such as fixed-point observation.

[0003] In order to reduce the volume of the traction rope in the insertion part, the traction rope in the prior art is a flat wire with a flat structure, which fits the inner wall of the insertion part better, thereby increasing the volume of the instrument tube and the camera module to be suitable for a wider range of applications. However, due to its flat shape, the connection surface between the flat wire and the inner wall of the insertion part is single, and during operation, the flat wire may be more likely to loosen or break at the connection point. Summary of the invention

[0004] In view of the above shortcomings of the related technologies, the present application provides an active bending section and an endoscope to solve the above technical problems.

[0005] The present application provides an active bending section, which includes a snake bone and a flat wire. The snake bone includes a snake bone first section. The outer wall of the snake bone first section is recessed inward to form a connecting portion. The snake bone first section is provided with a through hole. The through hole and the connecting portion are correspondingly arranged. The flat wire is passed through the snake bone first section. The flat wire has a bending portion. The bending portion extends out of the through hole and is mutually adhered to and connected with the connecting portion.

[0006] In one embodiment of the present application, the connecting portion is configured as an annular structure, the connecting portion extends along the circumferential direction of the first segment of the snake bone, and the connecting portion is connected to one or more flat wires.

[0007] In one embodiment of the present application, the first section of the snake bone also includes a guide portion, which is located in the through hole, one end of the guide portion is connected to the hole wall forming the through hole, and the other end is bent toward the inside of the first section of the snake bone, and the flat wire and at least part of the guide portion abut against each other.

[0008] In one embodiment of the present application, the outer wall of the first section of the snake bone is recessed inward to form a recessed portion, and a through hole is formed between an end of the recessed portion away from the connecting portion and the outer wall of the first section of the snake bone.

[0009] In one embodiment of the present application, an end of the recessed portion away from the through hole extends into the connecting portion.

[0010] In one embodiment of the present application, the depth of the recessed portion gradually decreases along the direction from the through hole to the connecting portion.

[0011] In one embodiment of the present application, the first section of the snake bone further includes a fixing portion, which is located on a side of the connecting portion away from the through hole, and is connected to one end of the bending portion.

[0012] In one embodiment of the present application, the bending portion includes a first sub-bending portion and a second sub-bending portion, one end of the first sub-bending portion is bent toward and connected to the connecting portion, and the other end extends toward the through hole, one end of the second sub-bending portion is bent toward and connected to the connecting portion, and is connected to one end of the first sub-bending portion away from the through hole, and the other end extends to the fixed portion and is connected to the fixed portion, and one end of the first sub-bending portion away from the through hole is connected to one end of the second sub-bending portion away from the fixed portion.

[0013] In one embodiment of the present application, the snake bone also includes a middle section of the snake bone. The first section of the snake bone and the middle section of the snake bone are connected to each other. The side wall of the middle section of the snake bone is recessed inward to form a flat wire groove. The flat wire groove is arranged opposite to the through hole. The flat wire is passed through the flat wire groove and extends to the through hole of the first section of the snake bone.

[0014] In one embodiment of the present application, the recessed depth of the connecting portion is less than or equal to the groove depth of the flat wire groove.

[0015] In one embodiment of the present application, the flat wire slot is configured as a rectangular slot, and the rectangular slot is arranged corresponding to the flat wire.

[0016] To achieve the above objectives and other related objectives, the present application provides an endoscope, including the aforementioned active bending section.

[0017] The technical solution adopted by the present invention can achieve the following beneficial effects: the snake bone includes a first section of the snake bone, and the first section of the snake bone has a connecting portion and a through hole. The bent portion of the flat wire can be inserted into the first section of the snake bone and extend out of the first section of the snake bone through the through hole. The bent portion and the connecting portion are attached to and connected to each other, and the connecting portion and the bent portion increase the connection area between the flat wire and the first section of the snake bone, and enable it to receive forces from all directions. This design enables the structure to better disperse stress when subjected to multi-directional loads, thereby improving the overall stability and bearing capacity. In addition, the first section of the snake bone is provided with a through hole, and the connection position between the first section of the snake bone and the flat wire can be adjusted from the inner wall of the snake bone in the prior art to the outer wall of the snake bone, which is convenient for assemblers to assemble and improves the assembly efficiency of the active bending section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic structural diagram of an active bending section shown in an exemplary embodiment of the present application; Figure 2 is a schematic structural diagram of an active bending segment from another perspective shown in an exemplary embodiment of the present application; Figure 3 is a structural schematic diagram of an active bending section shown in another exemplary embodiment of the present application; Figure 4 is a schematic structural diagram of an active bending segment at another viewing angle shown in another exemplary embodiment of the present application; Figure 5 is a schematic diagram of the structure of a snake bone shown in an exemplary embodiment of the present application; Figure 6 is a structural schematic diagram of an active bending section shown in yet another exemplary embodiment of the present application; Figure 7 is a schematic structural diagram of a snake bone shown in another exemplary embodiment of the present application; Figure 8 is a schematic diagram of the structure of a snake bone from another perspective shown in an exemplary embodiment of the present application; Fig. 9 is a schematic structural diagram of the middle segment of a snake bone shown in an exemplary embodiment of the present application; Fig.10 It is a schematic diagram of the structure of an endoscope shown in an exemplary embodiment of the present application.

[0020] In the figure: 1, endoscope; 100, active bending section; 110, snake bone; 111, first section of snake bone; 112, middle section of snake bone; 113, connecting part; 114, guiding part; 115, recessed part; 116, through hole; 117, flat wire groove; 118, fixing part; 120, flat wire; 121, bending part; 122, first sub-bending part; 123, second sub-bending part. DETAILED DESCRIPTION

[0021] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0022] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0023] In each embodiment of the present application, "proximal end" and "distal end" refer to the position of each component 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] An endoscope is a medical device that inserts an insertion part into the human body and observes the internal tissues of the human body through a camera module at the far end of the insertion part. It can help doctors determine the location of lesions in the patient's body and the tissue structure characteristics of the lesion location. An endoscope includes a handle and an insertion part. In actual operation, the traction wheel is driven to rotate by turning the lever on the handle, and the traction wheel drives the traction rope to adjust the posture of the curved section of the insertion part, thereby adjusting the direction of the camera module and realizing functions such as fixed-point observation.

[0025] In order to reduce the volume of the traction rope in the insertion part, the traction rope in the prior art is a flat wire with a flat structure, which fits the inner wall of the insertion part better, thereby increasing the volume of the instrument tube and the camera module to be suitable for a wider range of applications. However, due to its flat shape, the connection surface between the flat wire and the inner wall of the insertion part is single, and during operation, the flat wire may be more likely to loosen or break at the connection point.

[0026] The present application provides an active bending section 100, see Figure 1, applied to the insertion part of the endoscope 1. Medical staff can operate the operating end of the endoscope 1 to control the active bending section 100 to bend in the specified directions around. Among them, the distal end of the active bending section 100 can be provided with a camera module and an instrument pipeline, and the bent active bending section 100 can be rotated to a specified direction to facilitate observation and treatment by medical staff.

[0027] Please continue reading Figure 1 The active bending section 100 may include a snake bone 110 and a flat wire 120, the flat wire 120 is connected to the snake bone 110, and the snake bone 110 is bent or straightened under the drive of the flat wire 120. Exemplarily, the snake bone 110 may include a plurality of snake bone joints, and two adjacent snake bone joints are connected to each other. The two adjacent snake bone joints are rotationally connected, so that the snake bone joints can be rotated based on the tension of the flat wire 120, so that the active bending section 100 is switched from a straight state to a bent state.

[0028] It is understandable that if Figure 2 As shown, compared with round wire, flat wire 120 fits the inner wall of snake bone 110 more closely, and the space occupied by flat wire 120 in the radial direction of snake bone 110 is smaller, thereby increasing the volume share of instrument tube and camera module. Under the same volume of active bending section 100, compared with round wire, the size of camera module and instrument tube of active bending section 100 using flat wire 120 can be configured larger, and the camera module of larger size can have a larger field of view, and the instrument tube can also provide a larger insertion space for the instrument, thereby increasing the use effect and application range of active bending section 100.

[0029] Please continue reading Figure 2 , the snake bone 110 may include a snake bone first section 111. The snake bone first section 111 may be a snake bone section arranged at the distal end of the snake bone 110. The outer wall of the snake bone first section 111 is recessed inward to form a connecting portion 113, and the connecting portion 113 is generally a recessed structure. The snake bone first section 111 is provided with a through hole 116, and the through hole 116 and the connecting portion 113 are arranged correspondingly, and the through hole 116 and the connecting portion 113 may be distributed along the direction from the proximal end of the snake bone 110 to the distal end of the snake bone 110. Among them, the through hole 116 is arranged correspondingly to the flat wire 120, that is, the through hole 116 may be a rectangular hole.

[0030] The flat wire 120 is inserted into the first section 111 of the serpentine bone. In other words, the flat wire 120 is located in the serpentine bone 110 and is inserted into the first section 111 of the serpentine bone. The flat wire 120 has a bending portion 121, which extends out of the through hole 116 and is attached to and connected with the connecting portion 113. The bending portion 121 and the connecting portion 113 cooperate with and are connected to each other. This arrangement can increase the connection area between the flat wire 120 and the connecting portion 113, and improve the connection effect between the flat wire 120 and the serpentine bone 110. In addition, at least part of the flat wire 120 is inserted outside the first section 111 of the serpentine bone. This arrangement can also prevent the flat wire 120 from occupying the space in the first section 111 of the serpentine bone, and provide more space for the camera module and the instrument tube. In addition, the flat wire 120 can be extended through the through hole 116, which can adjust the connection between the flat wire 120 and the snake bone first section 111 from the inner wall of the snake bone first section 111 to the outer wall of the snake bone first section 111. This setting can facilitate the assembly work between the flat wire 120 and the snake bone first section 111 and improve the assembly efficiency of the active bending section 100.

[0031] In this example, please refer to Figure 1 The first segment 111 of the serpentine bone may also include a fixing portion 118. For example, the fixing portion 118 may be located at the distal end of the first segment 111 of the serpentine bone. The fixing portion 118 is located on the side of the connecting portion 113 away from the through hole 116, and the fixing portion 118 is connected to the end of the bending portion 121 away from the connecting portion 113. The fixing portion 118 can fix at least part of the distal end of the flat wire 120, so as to avoid the distal end of the flat wire 120 being not fixed and interfering with the operation of the device or blocking the field of view of the camera module, thereby improving the use effect of the active bending section 100. In addition, the fixing portion 118 can provide a connection between the flat wire 120 and the first segment 111 of the serpentine bone, thereby improving the operational stability of the active bending section 100.

[0032] It is understandable that before the connection portion 113 is connected to the flat wire 120, the fixing portion 118 can pre-fix the flat wire 120 to the outer wall of the first segment of the snake bone 111. The pre-fixing setting can stretch and pre-tighten the flat wire 120 along a preset direction before the connection portion 113 is connected to the flat wire 120. This setting can improve the fixing effect of the flat wire 120 and avoid the deviation of the direction of the bent portion 121 after fixing, thereby preventing stress concentration and the like.

[0033] In this example, see Figure 2, the bending portion 121 may include a first sub-bending portion 122 and a second sub-bending portion 123. Compared with a planar connection, the bending arrangement of the first sub-bending portion 122 and the second sub-bending portion 123 can increase the connection area between the bending portion 121 and the connecting portion 113, thereby improving the connection effect between the snake bone first section 111 and the flat wire 120. One end of the first sub-bending portion 122 is bent and connected toward the inside of the connecting portion 113, and the other end extends toward the through hole 116. One end of the second sub-bending portion 123 is bent and connected toward the inside of the connecting portion 113, and the other end extends to the fixing portion 118 and is connected to the fixing portion 118. One end of the first sub-bending portion 122 away from the through hole 116 is connected to one end of the second sub-bending portion 123 away from the fixing portion 118. The first sub-bend portion 122 and the second sub-bend portion 123 can both contact the connecting portion 113, and the contact surface between the first sub-bend portion 122 and the connecting portion 113 is parallel to or intersects with the contact surface between the second sub-bend portion 123 and the connecting portion 113. There are multiple connecting surfaces with different orientations between the bending portion 121 and the flat wire 120, and the connecting surfaces with different orientations can disperse the force in multiple directions. This arrangement can enable the structure to better disperse stress when subjected to load, thereby improving the overall stability and bearing capacity.

[0034] In one embodiment, please refer to Figure 1 The connecting portion 113 is configured as an annular structure. The connecting portion 113 can extend along the circumferential direction of the snake bone first section 111. The connecting portion 113 with an annular structure can improve the structural stability of the snake bone first section 111 and provide a certain support force for the snake bone first section 111 in the radial direction. The connecting portion 113 is connected to one or more flat wires 120. The connecting portion 113 with an annular structure can be formed in one step. For example, the connection between the connecting portion 113 and multiple flat wires 120 is completed by one stamping and welding, which greatly improves the assembly efficiency of the active bending section 100. In addition, the annular structure formed by the depression forms a complete closed loop, which helps to disperse and withstand forces from all directions.

[0035] It is understandable that the connecting portion 113 of the annular structure can be directly sleeved with an annular fastener, or an integrated annular fastener can be formed by welding at the connecting portion 113 of the annular structure, which greatly improves the connection firmness between the flat wire 120 and the connecting portion 113.

[0036] In one embodiment, please refer to Figure 3 as well as Figure 4The first section 111 of the snake bone may also include a guide portion 114, which can play a guiding and supporting role. The guide portion 114 is located in the through hole 116, one end of the guide portion 114 is connected to the hole wall forming the through hole 116, and the other end is bent toward the inside of the first section 111 of the snake bone, and the flat wire 120 and at least part of the guide portion 114 abut against each other. Part of the flat wire 120 extends out of the through hole 116, and the guide portion 114 adjusts the extension direction of the flat wire 120, and also provides a more stable path for the connection of the flat wire 120. Moreover, the guide portion 114 can always support the flat wire 120, so as to prevent the flat wire 120 from unnecessary relative sliding due to the stretching of the subsequent operating part.

[0037] In addition, Figure 4 As shown, the connection between the guide portion 114 and the hole wall forming the through hole 116 is chamfered, which can avoid the hole wall of the through hole 116 increasing the wear of the flat wire 120, improve the reliability of the flat wire 120, and improve the safety of the active bending section 100.

[0038] In another embodiment, see Figure 5 The outer wall of the first segment 111 of the snake bone is recessed inward to form a recessed portion 115, and a through hole 116 is formed between the end of the recessed portion 115 away from the connecting portion 113 and the outer wall of the first segment 111 of the snake bone. Figure 6 As shown, the recessed portion 115 can guide and support the flat wire 120, and the two sides of the recessed portion 115 are connected to the outer wall of the first section of the snake bone 111, which greatly improves the structural strength of the recessed portion 115. In addition, the structure of the recessed portion 115 can also limit the flat wire 120 from sliding toward the two sides of the recessed portion 115, avoiding affecting the extension direction and sliding path of the flat wire 120, and improving the transmission effect of the flat wire 120. At the same time, the design of the through hole 116 also optimizes the spatial layout inside the first section of the snake bone 111, and improves the compactness and stability of the overall structure.

[0039] More specifically, see Figure 7 , one end of the recessed portion 115 away from the through hole 116 extends into the connecting portion 113, and the recessed portion 115 can guide the flat wire 120 to the connecting portion 113, so that the flat wire 120 has a clearer extension path. This arrangement can also make at least part of the flat wire 120 extending out of the through hole 116 be in the recessed portion 115 and the connecting portion 113, avoiding at least part of the flat wire 120 protruding too much from the outer surface of the snake bone first section 111, thereby affecting and hindering the active bending section 100 from being smoothly inserted into the human body channel.

[0040] Preferably, if Figure 8As shown, the depression depth of the depression 115 gradually decreases along the direction from the through hole 116 to the connecting portion 113. The gradually changing depression 115 provides a progressive guiding and supporting effect for the flat wire 120, and this setting can enable the flat wire 120 to gradually and smoothly extend outward during the connection process. Due to the gradual decrease in the depression depth, the resistance encountered by the flat wire 120 will also gradually change accordingly. This change not only enables the flat wire 120 to be more smoothly inserted and fixed in the connecting portion 113, but also can reduce the stress concentration caused by the sudden change in the extension direction of the flat wire 120 to a certain extent, thereby improving the stability and durability of the overall structure. In addition, this setting can ensure that the flat wire 120 will not produce excessive interference or friction with other parts of the snake bone first section 111 during the extension process, thereby improving the compactness and fluidity of the overall structure.

[0041] In this example, please refer to Figure 1 The snake bone 110 may also include a middle snake bone section 112, and the first snake bone section 111 and the middle snake bone section 112 are connected to each other. The middle snake bone section 112 may be one or more snake bone sections connected to the proximal end of the first snake bone section 111, and the number of the middle snake bone sections 112 is not limited in this embodiment. For the convenience of observation, this embodiment is described by taking the middle snake bone section 112 as one snake bone section. Fig. 9 As shown, the side wall of the snake bone middle section 112 is recessed inward to form a flat wire groove 117, which can be configured as a rectangular groove. The rectangular groove is arranged corresponding to the flat wire 120, that is, the rectangular groove and the flat wire 120 have the same shape and size, so as to prevent the flat wire 120 from moving in the flat wire groove 117.

[0042] The flat wire groove 117 is arranged opposite to the through hole 116, and the flat wire groove 117 and the through hole 116 are distributed along the extension direction of the snake bone 110. The flat wire 120 is passed through the flat wire groove 117 and extends to the through hole 116 of the first section 111 of the snake bone. The arrangement of the flat wire groove 117 can improve the fixing effect of the flat wire 120, so that the flat wire 120 can smoothly extend into the through hole 116 of the first section 111 of the snake bone, and avoid the occurrence of stress concentration on the flat wire 120 at a certain position.

[0043] Preferably, the depression depth of the connecting portion 113 is less than or equal to the groove depth of the flat wire groove 117. When the depression depth of the connecting portion 113 is greater than the groove depth of the flat wire groove 117, in other words, the depression depth of the connecting portion 113 is greater than the thickness of the flat wire 120. The depression amplitude of the connecting portion 113 toward the axis of the serpentine 110 is too large, which reduces the size of the space in the first section 111 of the serpentine, affecting the volume of the camera module and the instrument tube in the first section 111 of the serpentine. The setting that the depression depth of the connecting portion 113 is less than or equal to the groove depth of the flat wire groove 117 can ensure that the flat wire 120 and the connecting portion 113 can be stably connected, and can avoid excessive depression of the first section 111 of the serpentine, thereby increasing the accommodation volume of the first section 111 of the serpentine to adapt to camera modules and instrument tubes of larger sizes.

[0044] To achieve the above-mentioned and other related purposes, the present application provides an endoscope 1, see Fig.10 , the endoscope 1 may include the aforementioned active bending section 100. In this way, the endoscope 1 has the beneficial effects of any of the aforementioned solutions, which will not be repeated here. The endoscope 1 may be a bronchoscope, a pyeloscope, an esophagoscope, a gastroscope, a colonoscope, an otoscope, a nasoscope, 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 1.

[0045] The technical solution adopted by the present invention can achieve the following beneficial effects: the snake bone 110 includes a snake bone first section 111, and the snake bone first section 111 has a connecting portion 113 and a through hole 116. The bending portion 121 of the flat wire 120 can be inserted into the snake bone first section 111 and extend out of the snake bone first section 111 through the through hole 116. The bending portion 121 and the connecting portion 113 are mutually attached and connected, and the connecting portion 113 and the bending portion 121 increase the connection area between the flat wire 120 and the snake bone first section 111, and enable it to receive forces from all directions. This design enables the structure to better disperse stress when subjected to multi-directional loads, thereby improving the overall stability and bearing capacity. In addition, the snake bone first section 111 is provided with a through hole 116, and the connection position between the snake bone first section 111 and the flat wire 120 can be adjusted from the inner wall of the snake bone 110 of the prior art to the outer wall of the snake bone 110, which is convenient for assembly personnel to assemble and improves the assembly efficiency of the active bending section 100.

[0046] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0047] In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0048] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An active bending section, characterized in that: include: A snake bone, wherein the snake bone comprises a first section of the snake bone, the outer wall of the first section of the snake bone is recessed inward to form a connecting portion, the first section of the snake bone is provided with a through hole, and the through hole and the connecting portion are arranged correspondingly; A flat wire is passed through the first section of the snake bone, and the flat wire has a bending portion, which extends out of the through hole and is attached to and connected with the connecting portion.

2. The active bending section according to claim 1, characterized in that: The connecting portion is configured as an annular structure, the connecting portion extends along the circumferential direction of the first segment of the snake bone, and the connecting portion is connected to one or more of the flat wires.

3. The active bending section according to claim 1, characterized in that: The first section of the snake bone also includes a guide portion, which is located in the through hole. One end of the guide portion is connected to the hole wall forming the through hole, and the other end is bent toward the first section of the snake bone. The flat wire and at least part of the guide portion abut against each other.

4. The active bending section according to claim 1, characterized in that: The outer wall of the first section of the snake bone is recessed inward to form a recessed portion, and the through hole is formed between an end of the recessed portion away from the connecting portion and the outer wall of the first section of the snake bone.

5. The active bending section according to claim 4, characterized in that: One end of the recessed portion away from the through hole extends into the connecting portion; And / or, the recessed depth of the recessed portion gradually decreases along the direction from the through hole to the connecting portion.

6. The active bending section according to any one of claims 1 to 4, characterized in that: The first section of the snake bone also includes a fixing portion, which is located on a side of the connecting portion away from the through hole, and is connected to one end of the bending portion.

7. The active bending section according to claim 6, characterized in that: The bending portion includes a first sub-bending portion and a second sub-bending portion, one end of the first sub-bending portion is bent toward and connected to the connecting portion, and the other end extends toward the through hole, one end of the second sub-bending portion is bent toward and connected to the connecting portion, and is connected to an end of the first sub-bending portion away from the through hole, and the other end extends to the fixing portion and is connected to the fixing portion, and an end of the first sub-bending portion away from the through hole is connected to an end of the second sub-bending portion away from the fixed portion.

8. The active bending section according to claim 1, characterized in that: The snake bone also includes a middle section of the snake bone. The first section of the snake bone and the middle section of the snake bone are connected to each other. The side wall of the middle section of the snake bone is recessed inward to form a flat wire groove. The flat wire groove is arranged opposite to the through hole. The flat wire is passed through the flat wire groove and extends to the through hole of the first section of the snake bone.

9. The active bending section according to claim 8, characterized in that: The recessed depth of the connecting portion is less than or equal to the groove depth of the flat wire groove; And / or, the flat wire groove is configured as a rectangular groove, and the rectangular groove is arranged corresponding to the flat wire.

10. An endoscope, characterized in that: Comprising the active bending segment as claimed in any one of claims 1-9.

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