Active bending section, insertion part and endoscope
By designing an axially spaced slit structure on the active bending section of the tube, the slit width gradually increases and the edge stops during bending. Combined with the alternating second slit settings, the collapse problem of the active bending section is solved, improving the smoothness of instrument passage and the stability of the bending section.
Patent Information
- Application Number
- CN202422759823.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-11-13
AI Technical Summary
The existing active bending section is prone to collapse when bending, resulting in a reduction in the inner diameter and affecting the smooth passage of instruments.
The design incorporates multiple first slits spaced axially along the pipe body, with the slit width gradually increasing from both ends towards the middle. These slits provide edge or surface abutments during bending. Combined with multiple second slits arranged alternately, this design prevents collapse.
This effectively prevents the inner diameter of the active bending section from decreasing during bending, improves the smoothness of instrument passage, and enhances the stability and adaptability of the bending section.
Smart Images
Figure CN223569285U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to endoscope technical field especially relates to a kind of active bending section, insertion part and endoscope. BACKGROUND
[0002] Endoscope is a kind of commonly used medical instrument, is the checking instrument that can directly enter human body natural pipe, can provide sufficient diagnostic information for doctor to treat disease.Endoscope includes front end assembly, and front end assembly can be into human body through human body cavity or surgical incision.Endoscope in use process, by controlling the bending of active bending section, realize the observation to different positions in body.
[0003] In prior art, the slit structure of active bending section is horizontally opened, when active bending section bends, it is easy to cause the collapse of active bending section, lead to the inner diameter of active bending section reduces, and then reduce the patency of instrument passing through from active bending section.
[0004] Therefore, provide a kind of active bending section that does not collapse when bending, insertion part and endoscope, it is the technical problem that the person skilled in the art urgently solves. UTILITY MODEL CONTENT
[0005] The utility model discloses a kind of active bending section, insertion part and endoscope, to solve the technical problem that active bending section in relevant technology exists when bending collapse.
[0006] To solve the above problems, the utility model adopts the following technical scheme:
[0007] First, a kind of active bending section is provided, including pipe body, pipe body has multiple first slits, and first slit penetrates the pipe wall of pipe body;Multiple first slits are spaced apart along the axial direction of pipe body;
[0008] First slit extends along the circumferential direction of pipe body, and the width of first slit in the axial direction of pipe body gradually increases from the two ends of first slit extension direction to middle part;
[0009] In the case where pipe body bends to maximum bending angle, the two side edge faces of first slit width direction line contact or face-face contact.
[0010] In some schemes, in the two edges of first slit in the axial direction of pipe body, one is greater than the other relative to the inclination angle of vertical plane of axial direction of pipe body.
[0011] In some schemes, further include multiple second slits;Multiple first slits are spaced apart along the axial direction of pipe body and set on the first side of the radial direction of pipe body, multiple second slits are spaced apart along the axial direction of pipe body and set on the second side of the radial direction of pipe body;And multiple first slits and multiple second slits are alternately arranged in the axial direction of pipe body.
[0012] The first side and the second side are located at two sides in a radial direction of the tube body.
[0013] In some embodiments, the first side and the second side are two opposite sides in a radial direction of the tube body.
[0014] In some embodiments, the axial projection of the plurality of first slits and the plurality of second slits has a partial overlap.
[0015] The narrow side structure is formed between one of the two second slits adjacent to the first slit and the other second slit.
[0016] In some embodiments, of the two edges of the second slit in the axial direction of the tube body, one has a larger inclination angle relative to a plane perpendicular to the axial direction of the tube body than the other.
[0017] The narrow side structure is formed between the edge of the first slit having a larger inclination angle and the edge of the adjacent second slit having a larger inclination angle, and the wide side structure is formed between the edge of the first slit having a smaller inclination angle and the edge of the adjacent second slit having a smaller inclination angle.
[0018] In some embodiments, the edge of the first slit having a smaller inclination angle and the edge of the second slit having a smaller inclination angle are respectively provided with a groove structure at both ends in the extending direction thereof.
[0019] In some embodiments, the two edges of the first slit have the same inclination direction, both of which are inclined from the middle part to the end part of the edge towards the distal end of the tube body.
[0020] In a second aspect, an insertion part is provided, and the distal end of the insertion part is provided with the active bending section in the first aspect.
[0021] In a third aspect, an endoscope is provided, and the endoscope comprises the insertion part in the second aspect.
[0022] The technical solution of the utility model can achieve the following beneficial effects:
[0023] The active bending section provided by the application is bent towards the side provided with the first gap, the two edges of the first gap in the axial direction of the pipe body gradually approach each other when the pipe body is bent, and since the width of the first gap in the axial direction gradually increases from the two ends to the middle of the extension direction of the first gap, when the pipe body is bent to the maximum bending angle, the surface where one edge of the first gap in the axial direction is located abuts against the surface where the other edge is located, or the edge of the surface where one edge of the first gap in the axial direction is located abuts against the edge of the surface where the other edge is located, the corresponding arc angle of the contact positions on the opposite sides in the axial direction of the first gap is larger when the pipe body is bent, so that the active bending section is not prone to collapse, and the situation that the inner diameter of the active bending section is reduced to affect the passing of the instrument is greatly avoided. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.
[0025] Figure 1 is the axial view of the active bending section of the present application when it is not bent;
[0026] Figure 2 is Figure 1 is the enlarged view of position A in FIG. 1;
[0027] Figure 3 is the axial view of the active bending section of the present application when it is bent to the maximum bending angle towards the first side;
[0028] Figure 4 is Figure 3 is the enlarged view of position B in FIG. 2;
[0029] Figure 5 is Figure 3 is the enlarged view of position C in FIG. 3;
[0030] Figure 6 is the axial view of the active bending section of the present application when it is bent to the maximum bending angle towards the second side;
[0031] Figure 7 is the front view of the active bending section of the present application when it is not bent;
[0032] Figure 8 is Figure 7 is the enlarged view of position D in FIG. 4;
[0033] Figure 9 is Figure 7 is the enlarged view of position E in FIG. 5;
[0034] Figure 10 is the plan view of the active bending section of the utility model when not bent;
[0035] Figure 11 is the state diagram of the edge formed part intersection when the pipe body is bent;
[0036] Figure 12 is the Figure 11 enlarged view of F in the figure;
[0037] Figure 13 is the Figure 11 enlarged view of G in the figure;
[0038] Figure 14 is the shaft view of the endoscope of the utility model.
[0039] In the figure: 100, active bending section; 110, pipe body; 111, first gap; 112, second gap; 113, narrow edge structure; 114, wide edge structure; 115, groove structure; 200, insertion part; 300, endoscope. DETAILED DESCRIPTION
[0040] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope protected by the utility model.
[0041] The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second" and the like are generally of a kind, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.
[0042] In the embodiments of the present application, "proximal end" and "distal end" refer to the relative position of each component in the use environment relative to the user, wherein the end closer to the user is designated as "proximal end" and the end farther from the user is designated as "distal end".
[0043] The applicant found in use that the slit structure of the existing active bending section 100 is horizontally opened, and when the active bending section 100 is bent, the two ends of the horizontally opened slit structure in the axial direction of the pipe body 110 are prone to poor contact, leading to collapse, thereby reducing the inner diameter of the active bending section 100 and affecting the smoothness of the instrument passing through the active bending section 100.
[0044] The application will be described in detail below with reference to the accompanying drawings Figures 1 to 14 and specific embodiments and application scenarios.
[0045] Please refer to Figure 1 and Figure 7 The active bending section 100 provided in some embodiments of the application includes a pipe body 110. The pipe body 110 is a basic structural member, which can provide a mounting base for other components when used in an endoscope 300.
[0046] In some embodiments, when the active bending section 100 is used in an endoscope 300, the pipe body 110 can be bent under the control of an operating structure to adapt to the body cavity, and can also obtain different angle views according to the bending of the pipe body 110. There are many types of operating mechanisms, so the specific type of the operating mechanism is not limited in this embodiment. Specifically, the operating structure can be but is not limited to a traction mechanism of the endoscope 300.
[0047] As Figure 2 described, the pipe body 110 has a plurality of first slits 111 penetrating the pipe wall thereof, and the plurality of first slits 111 are arranged at a first side of the pipe body 110 in the radial direction and spaced apart in the axial direction of the pipe body 110, and the width of the first slit 111 in the axial direction of the pipe body 110 gradually increases from the two ends to the middle of the extension direction of the first slit 111.
[0048] During the bending of the pipe body 110 towards the side provided with the first slit 111, the two edges of the first slit 111 at the bending part of the pipe body 110 gradually approach, and since the width of the first slit 111 in the axial direction of the pipe body 110 gradually increases from the two ends to the middle of the extension direction of the first slit 111. When the pipe body 110 is bent to the maximum bending angle, as Figure 4 shown, the face where one of the edges of the first slit 111 in the axial direction is located abuts against the face where the other edge is located; or the edge of the face where one of the edges of the first slit 111 in the axial direction is located abuts against the face where the other edge is located. When the pipe body 110 is bent, the contact positions of the opposite two sides in the axial direction of the first slit 111 correspond to a larger angle of curvature, thereby not easily causing the collapse of the active bending section 100, and greatly avoiding the situation that the reduction of the inner diameter of the active bending section 100 affects the passing of the instrument.
[0049] It should be noted that, in this embodiment, the axial direction of the tube body 110 is as follows: Figure 1 As shown in L1, the circumferential direction of the tube body 110 is as follows: Figure 1 As shown in O1, the radial direction of the tube 110 is as follows: Figure 9 As shown in D, the width of the first gap 111 is as follows: Figure 8 As shown in W.
[0050] In some embodiments, such as Figure 2 As shown, the tube body 110 also has a plurality of second slits 112, which are spaced apart along the axial direction of the tube body 110 on the second side of the radial direction of the tube body 110, and the first side and the second side are different sides.
[0051] Multiple second slits 112 are provided on the second radial side of the tube body 110, allowing the tube body 110 to bend towards the second side, thus increasing the bending direction of the active bending section 100. When the active bending section 100 is used in the endoscope 300, it can better adapt to the internal cavity and obtain a field of view from more different angles.
[0052] In this embodiment, the plurality of first slits 111 and the plurality of second slits 112 on the tube body 110 can be made using an integral cutting process or other processes. This embodiment is symmetrical and not limited.
[0053] In some embodiments, such as Figure 2 As shown, the first side and the second side are two sides of the tube 110 that are radially opposite. During the bending of the tube 110 towards the first side, the width of the second gap 112 on the second side in the axial direction of the tube 110 will not decrease, thus avoiding motion interference between the second gap 112 and the tube 110 bending towards the first side, and maximizing the bending amount of the tube 110 towards the first side. Similarly, during the bending of the tube 110 towards the second side, the width of the first gap 111 on the first side in the axial direction of the tube 110 will not decrease, thus avoiding motion interference between the first gap 111 and the tube 110 bending towards the second side, and maximizing the bending amount of the tube 110 towards the first side. By having the first side and the second side be radially opposite, the independence of the bending of the tube 110 towards the first side or towards the second side is ensured, preventing motion interference between the first gap 111 and the second gap 112.
[0054] As a preferred embodiment, such as Figure 2 As shown, the width of the second slit 112 in the axial direction of the tube body 110 also gradually increases from both ends of the second slit 112 extension direction toward the middle.
[0055] As the width of the second slit 112 in the axial direction of the tube body 110 gradually increases from the two ends to the middle of the extension direction of the second slit 112, when the tube body 110 is bent to the maximum bending angle towards the second side, the face where one edge of the second slit 112 in the axial direction is located abuts against the face where the other edge is located, or the edge of the face where one edge of the second slit 112 in the axial direction is located abuts against the edge of the face where the other edge is located, the corresponding arc angle of the contact positions of the opposite sides of the second slit 112 in the axial direction is larger when the tube body 110 is bent, and thus the active bending section 100 is less likely to collapse, greatly avoiding the situation that the inner diameter of the active bending section 100 is reduced to affect the passing of the instrument.
[0056] As shown in Figure 2 and Figure 4 , the plurality of first slits 111 and the plurality of second slits 112 are alternately arranged in the axial direction of the tube body 110.
[0057] In the process of bending the tube body 110 towards the first side where the first slit 111 is located, the width of the first slit 111 in the axial direction of the tube body 110 gradually decreases, and the tensile stress of the second side gradually increases. Therefore, by alternately arranging the plurality of second slits 112 and the plurality of first slits 111, when the width of the first slit 111 in the axial direction of the tube body 110 gradually decreases, the width of the second slit 112 in the axial direction of the tube body 110 gradually increases, as shown in Figure 5 , thereby reducing the tensile stress of the second side; similarly, when the tube body 110 is bent towards the second side, the plurality of first slits 111 alternately arranged with the second slit 112 can also reduce the tensile stress of the first side.
[0058] In some embodiments, there is at least one second slit 112 between any two adjacent first slits 111.
[0059] In some embodiments, there is at least one first slit 111 between any two adjacent second slits 112.
[0060] In some embodiments, the plurality of first slits 111 forms a plurality of first slit groups, and the plurality of second slits 112 forms a plurality of second slit groups. There is at least one first slit 111 in each first slit group, and at least one second slit 112 in each second slit group. There is a second slit group between any two adjacent first slit groups.
[0061] As shown in Figure 2 and Figure 4 , of the two edges of the first slit 111 in the axial direction of the tube body 110, the inclination angle of one edge relative to the plane perpendicular to the axial direction of the tube body 110 is greater than the inclination angle of the other edge.
[0062] In the process of bending the tube body 110 towards the first side where the first slit 111 is located, the edge with a larger inclination angle in the tube body 110 axial direction of the first slit 111 will actively move closer to the edge with a smaller inclination angle, and the edge with a larger inclination angle will have a larger radial outward convex variable along the tube body 110. In this way, the two edges can form an at least partially intersecting state, as shown by the line connecting the P points in Figure 12 and Figure 13 , and thus avoid the two slit closure sides from being nested, preventing collapse.
[0063] Figures 11-13 The solid line part in the figure represents the edge with a smaller inclination angle, and the dashed line part represents the edge with a larger inclination angle.
[0064] As shown in Figure 2 and Figure 4 , among the two edges of the second slit 112 in the tube body 110 axial direction, one has a larger inclination angle relative to the plane perpendicular to the tube body 110 axial direction, and the other has a smaller inclination angle relative to the plane perpendicular to the tube body 110 axial direction.
[0065] In the process of bending the tube body 110 towards the second side where the second slit 112 is located, the edge with a larger inclination angle in the tube body 110 axial direction of the second slit 112 will actively move closer to the edge with a smaller inclination angle, and the edge with a larger inclination angle will have a larger radial outward convex variable along the tube body 110. In this way, the two edges can form an at least partially intersecting state, and thus avoid the two slit closure sides from being nested, preventing collapse.
[0066] As shown in Figure 3 and Figure 6 , the maximum bending angle of the tube body 110 towards the first side is equal to the maximum bending angle of the tube body 110 towards the second side.
[0067] When the operator (doctor) operates the endoscope 300 during surgery, the tube body 110 is driven to bend towards the first side or the second side by rotating the handle on the endoscope 300, driven by the driving mechanism and the traction rope; by the fact that the maximum bending angle of the tube body 110 along the first side is equal to the maximum bending angle of the tube body 110 along the second side, when the operator (doctor) rotates the handle by the same radian during surgery, the angle of the tube body 110 bending on the first side or the second side is the same, which is more conducive to the control of the active bending section 100 by the operator (doctor) during surgery.
[0068] Specifically, the maximum bending angle of the pipe body 110 bending towards the first side is equal to the maximum bending angle of the pipe body 110 bending towards the second side in the same way that the plurality of first slits 111 and the plurality of second slits 112 are completely identical. Correspondingly, the maximum bending angle of the pipe body 110 bending towards the first side can be equal to the maximum bending angle of the pipe body 110 bending towards the second side in other ways, which is not limited in the embodiment.
[0069] As shown in Figure 2 , the axial projection of the plurality of first slits 111 and the plurality of second slits 112 along the pipe body 110 has partial overlap, and one of the adjacent two second slits 112 and any first slit 111 forms a narrow edge structure 113, and the other forms a wide edge structure 114.
[0070] In the process of the pipe body 110 bending towards the first side where the plurality of first slits 111 are located or the second side where the plurality of second slits 112 are located, the narrow edge structure 113 has a larger deformation, and the edges of the narrow edge structure 113 and the wide edge structure 114 are deformed outwardly in the radial direction, and the edges separated from the wide edge structure 114 are deformed inwardly. In this way, the two edges can form an at least partially intersecting state, thereby avoiding the two edges of the two slits from being nested and preventing collapse.
[0071] Naturally, the width of the wide edge structure 114 along the axial direction of the pipe body 110 is greater than the width of the narrow edge structure 113 along the axial direction of the pipe body 110.
[0072] As shown in Figure 2 and Figure 4 , the narrow edge structure 113 is formed between the edge with a larger inclination angle of the first slit 111 and the edge with a larger inclination angle of the adjacent second slit 112, and the wide edge structure 114 is formed between the edge with a smaller inclination angle of the first slit 111 and the edge with a smaller inclination angle of the adjacent second slit 112.
[0073] In the process of the pipe body 110 bending towards the first side where the plurality of first slits 111 are located, the edge with a larger inclination angle of the first slit 111 deforms outwardly in the radial direction of the pipe body 110, and the deformation of the narrow edge structure 113 is also larger, thereby better avoiding the edge closing side of the first slit 111 from being nested, and further preventing collapse. Similarly, in the process of the pipe body 110 bending towards the second side where the plurality of second slits 112 are located, the edge closing side of the second slit 112 can also be better avoided from being nested, and further preventing collapse.
[0074] As shown in Figure 2 and Figure 4As shown, the edge with smaller inclination angle of the first slit 111 and the edge with smaller inclination angle of the second slit 112 are respectively provided with a groove structure 115 at both ends of the self-extending direction.
[0075] The design of the groove structure 115 enables the pipe body 110 to more flexibly adapt to shape changes when bending; in the area where the pipe body 110 needs to be bent, the groove structure 115 can allow the pipe body 110 to locally deform to a certain extent during the bending process, thereby reducing the force required for overall bending and making the bending process smoother.
[0076] All groove structures 115 are towards the wide edge structure 114, which has a larger cross-sectional area and stronger carrying capacity than the narrow edge or ordinary edge; when the pipe body 110 is bent, the bending part will be subjected to stress and deformation from different directions, and the groove structure 115 towards the wide edge enables the groove structure 115 to more easily disperse and transfer stress to the wide edge structure 114 during the bending process, thereby maintaining the stability of the pipe body 110 when bending.
[0077] In this embodiment, the groove structure 115 can be semicircular, semieliptical or other shapes, which are not limited in this embodiment.
[0078] In some embodiments, as shown in Figure 7 and Figure 9 , the inclination directions of the two edges of the first slit 111 are the same, both along the direction of the arrow of the Figure 9 middle curve O2. During the process of bending the pipe body 110 towards the first side where the plurality of first slits 111 are located, the edge with smaller inclination angle can be made to have as small as possible radial outward convex variable of the pipe body 110, while forming an at least partially intersecting state and maintaining the stability of the pipe body 110 when bending.
[0079] Correspondingly, the inclination directions of the two edges of the second slit 112 are also the same and consistent with the inclination directions of the two edges of the first slit 111. During the process of bending the pipe body 110 towards the second side where the plurality of second slits 112 are located, the edge with smaller inclination angle can be made to have as small as possible radial outward convex variable of the pipe body 110, while forming an at least partially intersecting state and maintaining the stability of the pipe body 110 when bending.
[0080] As shown in Figure 7 and Figure 9As shown, both edges of the first slit 111 are inclined from the middle to the end towards the distal end of the tube body 110. In the case where the active bending section 100 is used for the endoscope 300, the driving mechanism of the endoscope 300 enters from the proximal end of the tube body 110 and controls the active bending section 100 to bend towards the first side. Therefore, the structure that both edges of the first slit 111 are inclined from the middle to the end towards the distal end of the tube body 110 is in line with the actual use requirements of the endoscope 300.
[0081] Correspondingly, both edges of the second slit 112 are also inclined from the middle to the end towards the distal end of the tube body 110. In the case where the active bending section 100 is used for the endoscope 300, the driving mechanism of the endoscope 300 enters from the proximal end of the tube body 110 and controls the active bending section 100 to bend towards the second side. Therefore, the structure that both edges of the second slit 112 are inclined from the middle to the end towards the distal end of the tube body 110 is in line with the actual use requirements of the endoscope 300.
[0082] In some embodiments, as shown in Figure 14 As shown, the insertion part 200 provided in some embodiments of the present application is connected to the proximal end of the active bending section 100.
[0083] In some embodiments, as shown in Figure 14 As shown, the endoscope 300 provided in some embodiments of the present application includes the insertion part 200.
[0084] The endoscope 300 of the embodiments of the present application can be a bronchoscope, a nephroscopy, an esophagoscope, a gastroscope, a colonoscope, an otoscope, a nasoscope, an oral mirror, a laryngoscope, a vaginal mirror, a laparoscope, an arthroscope, etc. The embodiments of the present application do not specifically limit the type of the endoscope 300.
[0085] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that processes, methods, articles, or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or further include elements inherent to such processes, methods, articles, or devices. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article, or device that includes the element.
[0086] Furthermore, it is to be understood that the scope of the methods and apparatus of the present application is not limited to what can be described in the discussion herein, and that the techniques can include practices or techniques other than those described in the discussion herein. Moreover, the present examples are to be considered as illustrative and not restrictive, and the application is not to be limited to the details given in the Examples or in the discussion herein. Other suitable methods, apparatuses, and techniques can be adapted for the application without departing from the scope of the application.
[0087] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.
Claims
1. An active bend section, characterized by The pipe body has a plurality of first slits, which are arranged along the axial direction of the pipe body and extend along the circumferential direction of the pipe body. The width of the first slits in the axial direction of the pipe body gradually increases from the two ends to the middle of the first slits in the extension direction. When the pipe body is bent to the maximum bending angle, the two side edges of the first slits in the width direction are in line contact or surface contact.
2. An active bend section according to claim 1, wherein, The inclination angle of one of the two edges of the first slits relative to the plane perpendicular to the axial direction of the pipe body is greater than the inclination angle of the other edge.
3. An active bend section according to claim 1 or 2, characterised in that, The first slits are arranged on the first side of the pipe body in the radial direction, and the second slits are arranged on the second side of the pipe body in the radial direction. The first side and the second side are located on two sides of the pipe body in the radial direction.
4. An active bend section according to claim 3, wherein, The first side and the second side are located on two opposite sides of the pipe body in the radial direction.
5. An active bend section according to claim 3, wherein, The first slits and the second slits have a partial overlap in the axial projection of the pipe body. One of the two second slits adjacent to the first slit forms a narrow side structure, and the other forms a wide side structure.
6. An active bend section according to claim 5, wherein, The inclination angle of one of the two edges of the second slits relative to the plane perpendicular to the axial direction of the pipe body is greater than the inclination angle of the other edge. The narrow side structure is formed between the edge with a greater inclination angle of the first slit and the edge with a greater inclination angle of the second slit adjacent to the first slit, and the wide side structure is formed between the edge with a smaller inclination angle of the first slit and the edge with a smaller inclination angle of the second slit adjacent to the first slit.
7. An active bend section according to claim 3, wherein, The edge with a smaller inclination angle of the first slit and the edge with a smaller inclination angle of the second slit are respectively provided with a groove structure at the two ends of the extension direction of the edge.
8. An active bend section according to claim 2, wherein, The inclination directions of the two edges of the first slit are the same, and both are inclined from the middle of the edge to the end of the edge toward the distal end of the pipe body.
9. An insertion portion characterized by, The distal end of the insertion portion is provided with the actively bent segment according to any one of claims 1-8.
10. An endoscope characterized by comprising: The insertion portion according to claim 9 is provided.