Endoscope bending piece and endoscope
By employing a combination of snap-fit and limiting structures in the curved endoscope component, the problem of low bending steering accuracy is solved, thus improving steering accuracy and controllability and simplifying production.
Patent Information
- Application Number
- CN202422972367.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-03
AI Technical Summary
The passive bending section of the endoscope bending component has low bending and turning accuracy due to the connection structure design, which affects the performance.
The system employs a limiting structure, including a snap-fit structure and a limiting structure, which are alternately arranged along the spiral path to limit the variation in spacing between adjacent rings and the amount of snap-fit deflection. The steering accuracy is improved by embedding limiting grooves and limiting protrusions.
It improves the swaying during bending and steering, enhances steering accuracy and endoscope controllability, simplifies production and processing, and reduces costs.
Smart Images
Figure CN223667915U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of endoscopes, in particular to an endoscope bending piece and an endoscope. BACKGROUND
[0002] The endoscope bending piece is an important component of an endoscope. The endoscope bending piece is axially pulled by a traction wire to make adjacent bending sections relatively rotate, so as to realize active bending of the bending piece. In some cases, the endoscope bending piece can have a passive bending tube section, which is arranged at a proximal end of an active bending tube section.
[0003] At present, the connection structure on the passive bending tube section usually has a large matching gap in order to realize good bending function, thereby reducing the steering accuracy during bending and bringing inconvenience to the use of the endoscope. CONTENT OF THE UTILITY MODEL
[0004] The present application provides an endoscope bending piece and an endoscope, which can solve the problem of low bending steering accuracy of the bending piece.
[0005] According to an aspect of the present application, an endoscope bending piece is provided in an embodiment, comprising:
[0006] A passive bending tube section, the passive bending tube section comprising a main body spirally arranged around a tube section axis, and a limiting structure arranged between adjacent turns of the main body, the limiting structure forming a limiting area spirally arranged around the tube section axis;
[0007] The limiting structure comprises clamping structures and limiting structures, the clamping structures and the limiting structures are alternately arranged along the spiral path of the limiting area, the clamping structures are used to limit the variation amount of the spacing between adjacent turns, and the limiting structures comprise limiting grooves and limiting protrusions, in each limiting structure, the slot opening of the limiting groove faces one side of the width direction of the limiting area, the limiting protrusion protrudes to the other side of the width direction of the limiting area, the limiting protrusion is embedded in the limiting groove, and a limiting interval is provided between the groove wall of the limiting groove and the side wall of the limiting protrusion, the limiting interval is used to limit the clamping deflection amount of the clamping structure along the width direction of the limiting groove.
[0008] In one embodiment, the slot opening of each limiting groove faces one side of the width direction of the limiting area, and the limiting protrusion protrudes to the other side of the width direction of the limiting area.
[0009] Or, the limiting structure includes a first limiting structure and a second limiting structure, the notches of the limiting slots of the first limiting structure are all directed to one side of the width direction of the limiting area, and the notches of the limiting slots of the second limiting structure are all directed to the other side of the width direction of the limiting area; the first limiting structure and the second limiting structure are alternately arranged along the spiral path of the limiting area.
[0010] In one embodiment, the clamping structure includes a first clamping protrusion and a second clamping protrusion alternately arranged along the spiral path of the limiting area, in each clamping structure, the first clamping protrusion is protruded to one side of the width direction of the limiting area, and the second clamping protrusion is protruded to the other side of the width direction of the limiting area, and the first clamping protrusion and the second clamping protrusion are matched to form a clamping.
[0011] In one embodiment, the protruding height of the limiting protrusion is greater than or equal to the protruding height of the first clamping protrusion or the second clamping protrusion.
[0012] In one embodiment, the first clamping protrusion includes a first arm body and a first lateral protrusion protruding from the side wall of the first arm body, and the second clamping protrusion includes a second arm body and a second lateral protrusion protruding from the side wall of the second arm body, the first arm body and the second arm body are arranged along the spiral path of the limiting area, the first lateral protrusion and the second lateral protrusion are opposite and arranged along the width direction of the limiting area, and the first lateral protrusion and the second lateral protrusion have a movable interval, and the movable interval is used for the relative movement of the first lateral protrusion and the second lateral protrusion along the width direction of the limiting area to meet the bending of the passive bending pipe segment.
[0013] In one embodiment, the clamping structure includes a "T"-shaped first clamping protrusion and two "L"-shaped second clamping protrusions respectively located on both sides of the first clamping protrusion, and the second lateral protrusions of the two "L"-shaped second clamping protrusions are opposite to the first lateral protrusions on both sides of the "T"-shaped first clamping protrusion.
[0014] Or, the first clamping protrusion and the second clamping protrusion are both "L"-shaped, and the first lateral protrusion of the "L"-shaped first clamping protrusion is opposite to the second lateral protrusion of the "L"-shaped second clamping protrusion.
[0015] In one embodiment, the movable interval gradually increases from the proximal end to the distal end of the passive bending pipe segment.
[0016] In one embodiment, a gap between the first lateral protrusion and the second arm body is a first gap, a gap between the second lateral protrusion and the first arm body is a second gap, and the first gap and the second gap are greater than the limiting interval.
[0017] In one embodiment, a pitch of the helical arrangement of the main body around the tube segment axis gradually decreases from a proximal end to a distal end of the passive curved tube segment.
[0018] According to another aspect of the present application, an endoscope is provided in one embodiment, comprising a handle, an insertion tube, and an endoscope bending piece as described above, the bending piece being connected to a distal end of the insertion tube, and the handle being connected to a proximal end of the insertion tube.
[0019] The endoscope bending piece and the endoscope according to the above embodiments limit the variation in the spacing between adjacent coil bodies on the main body through the clamping structure, achieve bending of the passive curved tube segment, and the limiting interval of the limiting structure can limit the clamping deflection of the clamping structure in the width direction of the limiting groove, improving the shaking during the bending and turning of the bending piece, improving the turning precision, and improving the controllability of the endoscope, facilitating endoscopic operation. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 FIG. 1 is a structural schematic diagram of an endoscope bending piece according to one embodiment;
[0021] Figure 2 FIG. 2 is an enlarged view of A in FIG. 1 according to one embodiment; Figure 1
[0022] Figure 3 FIG. 3 is another structural schematic diagram of an endoscope bending piece according to one embodiment;
[0023] Figure 4 FIG. 4 is an enlarged view of B in FIG. 3 according to one embodiment; Figure 3
[0024] Figure 5 FIG. 5 is a structural schematic diagram of an endoscope according to another embodiment;
[0025] BRIEF DESCRIPTION OF DRAWINGS
[0026] 1 - main body; 2 - limiting area; 3 - clamping structure, 31 - first clamping protrusion, 311 - first lateral protrusion, 312 - first arm body, 32 - second clamping protrusion, 321 - second lateral protrusion, 322 - second arm body, 33 - movable interval, 34 - first gap, 35 - second gap; 4 - limiting structure, 41 - limiting protrusion, 42 - limiting groove, 43 - limiting interval, 44 - first limiting structure, 45 - second limiting structure; 5 - bending piece; 6 - insertion tube; 7 - handle. DETAILED DESCRIPTION
[0027] The application will be further described below in detailed description with reference to the drawings. Like elements in different embodiments are denoted by like reference numerals. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, it will be apparent to one skilled in the art that some features, which are not necessarily the most important to the application, can be left out in different embodiments. In some cases, well-known features are not described in detail in order to avoid obscuring the application. The following detailed description is presented in terms of a method for illustration.
[0028] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be sequentially adjusted or adjusted in a manner that can be easily seen by those skilled in the art. Therefore, the order in the specification and drawings is only for the purpose of clearly describing a certain embodiment, and does not mean that it is the necessary order, unless otherwise stated that a certain order must be followed.
[0029] The serial numbers of the components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any order or technical meaning. Unless otherwise specified, "connection" and "coupling" in this paper include direct and indirect connections (couplings).
[0030] Please refer to Figures 1 to 4 The endoscope bending piece provided by the embodiment of the application includes a passive bending tube segment and other functional components as needed, which will be described in detail below.
[0031] The passive bending tube segment in the embodiment includes a main body 1 spirally arranged around a tube segment axis, and a limiting structure arranged between adjacent turns of the main body 1, the limiting structure forming a limiting area 2 spirally arranged around the tube segment axis. The limiting structure includes a clamping structure 3 and a limiting structure 4, the clamping structure 3 and the limiting structure 4 are alternately arranged along the spiral path of the limiting area 2, the clamping structure 3 is used to limit the variation amount of the spacing between adjacent turns, the limiting structure 4 includes a limiting groove 42 and a limiting protrusion 41, in each limiting structure 4, the slot of the limiting groove 42 faces one side of the width direction m of the limiting area 2, the limiting protrusion 41 protrudes to the other side of the width direction m of the limiting area 2, the limiting protrusion 41 is embedded in the limiting groove 42, and the limiting interval 43 between the groove wall of the limiting groove 42 and the side wall of the limiting protrusion 41 is used to limit the clamping deflection amount of the clamping structure 3 along the width direction of the limiting groove 42.
[0032] It is understood that in this embodiment, the ring body refers to the structure that spirals around the main body 1. The snap-fit structure 3 in the restriction area 2 can limit the variation in the spacing between adjacent ring bodies, solving the problem of uncontrollable bending that may occur when there is no restriction between adjacent ring bodies. The spacing between adjacent ring bodies is the distance between two adjacent ring bodies in the width direction of the restriction area 2. Figure 1 As shown, in this embodiment, the width direction m of the restricted area 2 is perpendicular to the spiral path extension direction n of the main body 1. The limiting structure 4 of the restricted area 2 limits the clamping deflection of the clamping structure 3 along the width direction of the limiting groove 42 through the limiting interval 43 between the groove wall of the limiting groove 42 and the side wall of the limiting protrusion 41. The smaller the clamping deflection, the less the shaking of the bending part 5 during the bending and turning process, and the higher the bending and turning accuracy. Moreover, the structure of the limiting protrusion 41 embedded in the limiting groove 42 is simple, which simplifies the limiting structure between adjacent rings of the passively bent pipe section, improves the production and processing efficiency of the bending part 5, and reduces the cost. In this embodiment, the clamping deflection is the amount of movement between the two clamping objects in the width direction of the limiting groove 42. In this embodiment, the width direction of the limiting groove 42 is perpendicular to the width direction m of the restricted area 2, and the depth direction of the limiting groove 42 is consistent with the width direction m of the restricted area 2. In this embodiment, the shapes of the limiting protrusion 41 and the limiting groove 42 are adapted to each other. For example, the limiting protrusion 41 can be rectangular, and the limiting groove 42 is a rectangular groove. The size of the rectangular limiting protrusion 41 can be slightly smaller than the size of the rectangular groove, and the size difference between the two forms the limiting interval 43. This embodiment does not impose specific limitations on the material of the passively bent pipe, and it can include, but is not limited to, metal materials. The passively bent pipe segment in this embodiment can be formed by, but is not limited to, spiral cutting. In this embodiment, the snap-fit structure 3 and the limiting structure 4 are arranged alternately along the spiral path of the limiting area 2. They can be arranged alternately in sequence. For example, one snap-fit structure 3 and one limiting structure 4 can be arranged alternately in sequence, or two snap-fit structures 3 and one limiting structure 4 can be arranged alternately in sequence. In some embodiments, other alternating methods or random alternating arrangements can also be used.
[0033] In one embodiment, such as Figure 3 As shown, the openings of each limiting groove 42 face one side of the width direction m of the limiting area 2, and each limiting protrusion 41 protrudes to the other side of the width direction m of the limiting area 2. In this embodiment, one side of the width direction m of the limiting area 2 is the side closest to one of the two adjacent rings, and the other side of the width direction m of the limiting area 2 is the side closest to the other of the two adjacent rings. In this embodiment, the openings of the limiting grooves 42 of the limiting structure 4 all face the same side, and the corresponding limiting protrusions 41 in the limiting structure 4 also all protrude to the same side. This simplifies the cutting process and is more conducive to the fabrication of the bent part 5.
[0034] In one embodiment, such as Figure 1 , Figure 2 As shown, the limiting structure 4 may also include a first limiting structure 44 and a second limiting structure 45. The openings of the limiting grooves 42 of the first limiting structure 44 all face one side of the width direction m of the limiting region 2, and the openings of the limiting grooves 42 of the second limiting structure 45 all face the other side of the width direction m of the limiting region 2. The first limiting structure 44 and the second limiting structure 45 are arranged alternately along the spiral path of the limiting region 2. In the first limiting structure 44, the limiting groove 42 can restrict the movement of the corresponding limiting protrusion 41 to one side in the width direction m of the limiting region 2. In the second limiting structure 45, the limiting groove 42 can restrict the movement of the corresponding limiting protrusion 41 to the other side in the width direction m of the limiting region 2. That is, the movement on both sides of the width direction m of the limiting region 2 is restricted, and the limiting effect of the limiting structure 4 is better. In this embodiment, the spiral path extension direction of the limiting region 2 is consistent with the spiral path extension direction n of the main body 1.
[0035] In one embodiment, the snap-fit structure 3 includes a first snap-fit protrusion 31 and a second snap-fit protrusion 32 alternately arranged along a spiral path of the restricted area 2. In each snap-fit structure 3, the first snap-fit protrusion 31 protrudes towards one side of the width direction m of the restricted area 2, and the second snap-fit protrusion 32 protrudes towards the other side of the width direction m of the restricted area 2. The first snap-fit protrusion 31 and the second snap-fit protrusion 32 cooperate with each other to form a snap-fit. The first snap-fit protrusion 31 and the second snap-fit protrusion 32 form two snap-fit objects of the snap-fit structure 3. This snap-fit structure 3 facilitates the setting of the limiting groove 42. In some embodiments, leaving a gap between two adjacent snap-fit structures 3 can form a limiting groove 42 for the limiting protrusion 41 to be inserted.
[0036] In one embodiment, the protrusion height of the limiting protrusion 41 is greater than or equal to the protrusion height of the first engaging protrusion 31 or the second engaging protrusion 32. The deeper the protrusion height of the limiting protrusion 41, the better the restriction on relative movement between the two engaging objects. Because there is a limiting interval 43 between the limiting protrusion 41 and the limiting groove 42, the limiting protrusion 41 has a smaller range of motion within the limiting groove 42. Furthermore, the higher the protrusion height of the limiting protrusion 41, the smaller its deflection range under the same limiting interval 43, resulting in better restriction. In some embodiments, the limiting protrusion 41 may also protrude into the main body 1, meaning the main body 1 also has a portion of the limiting groove 42 structure. In some application scenarios, the protrusion height of the limiting protrusion 41 may also be set to be less than the protrusion height of the first engaging protrusion 31 or the second engaging protrusion 32. In this embodiment, the protrusion direction of the limiting protrusion 41 is consistent with the width direction m of the limiting region 2.
[0037] In one embodiment, the first snap-fit protrusion 31 includes a first arm body 312 and a first lateral protrusion 311 protruding from the side wall of the first arm body 312, and the second snap-fit protrusion 32 includes a second arm body 322 and a second lateral protrusion 321 protruding from the side wall of the second arm body 322. The first arm body 312 and the second arm body 322 are arranged along a spiral path of the restriction region 2. The first lateral protrusion 311 and the second lateral protrusion 321 are opposite to each other and arranged along the width direction of the restriction region 2. There is a movable gap 33 between the first lateral protrusion 311 and the second lateral protrusion 321. The movable gap 33 allows the first lateral protrusion 311 and the second lateral protrusion 321 to move relative to each other along the width direction of the restriction region 2 to satisfy the bending of the passively bent pipe section. When the first lateral protrusion 311 and the second lateral protrusion 321 approach each other, the passively bent pipe section bends; when the first lateral protrusion 311 and the second lateral protrusion 321 move away from each other, the passively bent pipe section straightens. The maximum bending degree of the passively bent pipe section can be adjusted by the size of the movable interval 33.
[0038] In one embodiment, such as Figure 3 , Figure 4 As shown, the snap-fit structure 3 includes a "T"-shaped first snap-fit protrusion 31 and "L"-shaped second snap-fit protrusions 32 located on both sides of the first snap-fit protrusion 31. The second lateral protrusions 321 of the two "L"-shaped second snap-fit protrusions 32 are respectively opposite to the first lateral protrusions 311 on both sides of the "T"-shaped first snap-fit protrusion 31. In another embodiment, as... Figure 1 , Figure 2 As shown, both the first snap-fit protrusion 31 and the second snap-fit protrusion 32 are L-shaped. The first lateral protrusion 311 of the L-shaped first snap-fit protrusion 31 is opposite to the second lateral protrusion 321 of the L-shaped second snap-fit protrusion 32. When the L-shaped first snap-fit protrusion 31 and the L-shaped second snap-fit protrusion 32 are engaged, the distribution of the movable interval 33 on the passively bent pipe section is more uniform. In some application scenarios, the first snap-fit protrusion 31 and the second snap-fit protrusion 32 can also be set to other structures, which can achieve both snap-fit and bending movement.
[0039] In one embodiment, the movable interval 33 gradually increases from the proximal end to the distal end of the passively bent pipe section. This allows for a larger bending angle at the distal end of the passively bent pipe section, resulting in better deformation capacity at the distal end, while the bending angle at the proximal end is relatively smaller, ensuring that the bent component 5 has sufficient strength and is easier to control. In some applications, the movable interval 33 can also be set to the same size. When the size is the same, the manufacturing of the bent component 5 is simpler. Alternatively, the movable interval 33 can be partially set to the same size and partially set to different sizes, depending on the required bending shape.
[0040] In an embodiment, the gap between the first lateral protrusion 311 and the second arm body 322 is a first gap 34, the gap between the second lateral protrusion 321 and the first arm body 312 is a second gap 35, and the first gap 34 and the second gap 35 are greater than the limiting interval 43. The first gap 34 and the second gap 35 can be relatively large, so that when the first lateral protrusion 311 and the second lateral protrusion 321 are close to each other to form a passive bending pipe segment, the first lateral protrusion 311 and the second lateral protrusion 321 have a certain deflection space, which can be in the form of the lateral protrusion being inclined to the side wall of the arm body. In some application scenarios, the first gap 34 and the second gap 35 can also be equal to the limiting interval 43.
[0041] In an embodiment, the pitch of the helical arrangement of the main body 1 around the pipe segment axis gradually decreases from the proximal end to the distal end of the passive bending pipe segment. The distal end with a smaller pitch has better activity in bending deformation, and can allow the bending member 5 to adapt to more complex human body cavities. In some application scenarios, the pitch of the helical arrangement of the main body 1 around the pipe segment axis can also be the same.
[0042] In an embodiment, the endoscope bending member can further include an active bending pipe segment connected to the distal end of the passive bending pipe segment. The active bending of the active bending pipe segment can adjust the visual area of the imaging assembly of the endoscope head in the body, and the passive bending pipe segment can adaptively bend and deform along with the bending of the active bending pipe segment and the restriction of the human body cavity. However, the endoscope bending member can also include other functional structures, which will not be described one by one here.
[0043] The endoscope bending member provided by the above embodiment limits the change amount of the interval between adjacent coil bodies on the main body 1 through the clamping structure 3, realizes the bending of the passive bending pipe segment, and the limiting interval 43 of the limiting structure 4 can limit the clamping deflection amount of the clamping structure 3 along the width direction of the limiting groove 42, improve the shaking condition in the turning process of the bending member 5, improve the turning precision, and the controllability of the endoscope is good, which is conducive to the endoscopic operation and facilitates use. The structure of the limiting protrusion 41 embedded in the limiting groove 42 is also simple, which simplifies the limiting structure between adjacent coil bodies of the passive bending pipe segment, improves the production and processing efficiency of the bending member 5, and reduces the cost.
[0044] Please refer to Figure 5 The endoscope provided by the embodiment of the present application also includes a handle 7, an insertion tube 6, and an endoscope bending member 5 as described above. The bending member 5 is connected to the distal end of the insertion tube 6, and the handle 7 is connected to the proximal end of the insertion tube 6.
[0045] It can be understood that the endoscope bending piece in the embodiment is the same as the above-mentioned embodiments, and will not be repeated here. The endoscope in the embodiment can also include an imaging assembly, which is directly mounted at the distal end of the bending piece 5, or is mounted at the distal end of the bending piece 5 through a mounting piece. The handle 7 in the embodiment is a control end, through which the bending shape of the bending piece 5 can be controlled to adjust the visible area of the imaging assembly in the body, facilitating surgery or examination. The endoscope in the embodiment can also be provided with other functional structures or components according to needs, which will not be repeated here. The above-mentioned distal end is the end away from the handle 7 of the endoscope, and the proximal end is the end close to the handle 7.
[0046] The endoscope provided by the embodiment includes the bending piece 5, the bending piece 5 limits the change amount of the spacing between the adjacent coil bodies on the main body 1 through the clamping structure 3, realizes the bending of the passive bending pipe section, and the limiting interval 43 of the limiting structure 4 can limit the clamping deflection amount of the clamping structure 3 along the width direction of the limiting groove 42, improves the shaking condition in the turning process of the bending piece 5, improves the turning precision, the controllability of the endoscope is good, is conducive to the endoscopic operation, and facilitates use. The structure that the limiting protrusion 41 is embedded in the limiting groove 42 is also simple, simplifies the limiting structure between the adjacent coil bodies of the passive bending pipe section, improves the production and processing efficiency of the bending piece 5, and reduces the cost.
[0047] The above application of specific examples to the present application is described, which is only used to help understand the present application, and does not limit the present application. For those skilled in the art to which the present application belongs, according to the idea of the present application, a number of simple deductions, deformations or substitutions can be made.
Claims
1. An endoscope bend, characterized in that The application relates to a passive curved pipe section, comprising a main body spirally arranged around a pipe section axis, and a limiting structure arranged between adjacent turns of the main body, the limiting structure forming a limiting area spirally arranged around the pipe section axis. The limiting structure comprises clamping structures and limiting structures, the clamping structures and the limiting structures are alternately arranged along the spiral path of the limiting area, the clamping structures are used for limiting the variation of the spacing between adjacent turns, and each of the limiting structures comprises a limiting groove and a limiting protrusion, the slot of the limiting groove faces one side of the width direction of the limiting area, the limiting protrusion protrudes to the other side of the width direction of the limiting area, the limiting protrusion is embedded in the limiting groove, and a limiting interval is formed between the groove wall of the limiting groove and the side wall of the limiting protrusion, and the limiting interval is used for limiting the clamping deflection of the clamping structure along the width direction of the limiting groove. The slot of each of the limiting grooves faces one side of the width direction of the limiting area, and each of the limiting protrusions protrudes to the other side of the width direction of the limiting area.
2. The endoscope bend of claim 1, wherein, Alternatively, the limiting structure comprises first limiting structures and second limiting structures, the slots of the limiting grooves of the first limiting structures all face one side of the width direction of the limiting area, and the slots of the limiting grooves of the second limiting structures all face the other side of the width direction of the limiting area; and the first limiting structures and the second limiting structures are alternately arranged along the spiral path of the limiting area. The clamping structure comprises first clamping protrusions and second clamping protrusions alternately arranged along the spiral path of the limiting area, and each of the clamping structures comprises a first clamping protrusion and a second clamping protrusion, the first clamping protrusion protrudes to one side of the width direction of the limiting area, and the second clamping protrusion protrudes to the other side of the width direction of the limiting area; and the first clamping protrusion and the second clamping protrusion are matched to form a clamping.
3. The endoscope flexure of claim 1, wherein, The protruding height of the limiting protrusion is greater than or equal to the protruding height of the first clamping protrusion or the second clamping protrusion.
4. The endoscope bend of claim 3, wherein, The first clamping protrusion comprises a first arm body and a first lateral protrusion protruding from the side wall of the first arm body, the second clamping protrusion comprises a second arm body and a second lateral protrusion protruding from the side wall of the second arm body, the first arm body and the second arm body are arranged along the spiral path of the limiting area, the first lateral protrusion and the second lateral protrusion are opposite and arranged along the width direction of the limiting area, and an active interval is formed between the first lateral protrusion and the second lateral protrusion, the active interval is used for the relative movement of the first lateral protrusion and the second lateral protrusion along the width direction of the limiting area to meet the bending of the passive curved pipe section.
5. The endoscope bend of claim 3, wherein, The clamping structure comprises a "T"-shaped first clamping protrusion and two "L"-shaped second clamping protrusions respectively arranged on the two sides of the first clamping protrusion, and the second lateral protrusions of the two "L"-shaped second clamping protrusions are opposite to the first lateral protrusions on the two sides of the "T"-shaped first clamping protrusion respectively.
6. The endoscope bend of claim 5, wherein, Or, the first clamping convex part and the second clamping convex part are both in "L" shape, and the first lateral protrusion of the "L" shaped first clamping convex part is opposite to the second lateral protrusion of the "L" shaped second clamping convex part.
7. The endoscope flexure of claim 5, wherein, The gap between the first lateral protrusion and the second arm body is a first gap, and the gap between the second lateral protrusion and the first arm body is a second gap, and the first gap and the second gap are both greater than the limiting interval.
8. The endoscope flexure of claim 5, wherein, The active interval gradually increases from the proximal end to the distal end of the passive curved pipe section.
9. The endoscope flexure of any of claims 1-8, wherein, The pitch of the spiral arrangement of the main body around the pipe section axis gradually decreases from the proximal end to the distal end of the passive curved pipe section.
10. An endoscope characterized by comprising: The endoscope bending piece according to any one of claims 1-9 is connected to the distal end of the insertion tube, and the handle is connected to the proximal end of the insertion tube.