Bent tube, insertion portion, and endoscope

Abstract

The application discloses a bending tube, an insertion part and a endoscope, and belongs to the technical field of endoscopes. The bending tube comprises a first tube section and a second tube section arranged along the axial direction thereof, and the first tube section and the second tube section are riveted; the side wall of the first tube section is provided with a plurality of first slits arranged along the axial direction thereof, all the first slits are divided into two groups, and the two groups of first slits are oppositely arranged in the radial direction of the first tube section; the side wall of the second tube section is provided with at least two second slits arranged along the axial direction thereof, all the second slits are divided into two groups, and the two groups of second slits are oppositely arranged in the radial direction of the second tube section. In the application, the riveted connection between the first tube section and the second tube section has smaller resistance to rotation than the resistance to rotation of the first tube section or the second tube section itself, and under the condition of pulling the traction rope, the first tube section and the second tube section can firstly rotate relatively, so that the bending tube is preliminarily bent, and the distal end of the bending tube is not prone to being in contact with the tube body of the bending tube.

Description

Technical Field

[0001] This invention relates to the field of endoscopy technology, and more particularly to a curved tube, an insertion part, and an endoscope. Background Technology

[0002] Endoscopes are widely used in modern medicine. When using an endoscope, the insertion section of the endoscope needs to be inserted into the patient's body. By pulling a traction rope, the insertion section is actively bent, thereby controlling the bending direction of the distal end of the insertion section and obtaining image information of the target area.

[0003] In some existing products, the bending angle of the active bending tube can exceed 270 degrees. However, when the tube is bent, the larger the bending angle, the more likely the distal end of the tube is to come into contact with the tube body, preventing further bending. To address this, existing technology typically adjusts the position of the traction rope circumferentially, ensuring the rope's extension direction is no longer perpendicular to the gap in the tube. This causes a slight twist in the active bending tube as it bends, misaligning the distal end with the tube body and preventing contact. However, this twisting of the tube makes the bending direction uncontrollable, which is detrimental to the use of the endoscope. Summary of the Invention

[0004] The purpose of this application is to provide a curved tube, an insertion part, and an endoscope to solve the aforementioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a curved tube for use in an endoscope. The curved tube includes a first tube segment and a second tube segment arranged along its axial direction, and the first tube segment and the second tube segment are riveted together. The sidewall of the first tube segment is provided with a plurality of first slits arranged along its axial direction, all of the first slits being divided into two groups, and the two groups of first slits being arranged opposite each other in the radial direction of the first tube segment. The sidewall of the second tube segment is provided with at least two second slits arranged along its axial direction, all of the second slits being divided into two groups, and the two groups of second slits being arranged opposite each other in the radial direction of the second tube segment.

[0007] Secondly, embodiments of this application provide an insertion part, including the curved tube provided in the first aspect embodiment.

[0008] Thirdly, an endoscope provided in the embodiments of this application includes the insertion portion provided in the second aspect embodiment.

[0009] The technical solution provided in this application can achieve the following beneficial effects:

[0010] In this application, both the first and second pipe segments are provided with gaps, and both pipe segments form deformation spaces through these gaps. Through these deformation spaces, the first and second pipe segments can bend. Since the first and second pipe segments are riveted together, the driving force required for the rotation between the first and second pipe segments is less than the driving force for the rotation between the joints within the first or second pipe segment itself. When the traction rope is pulled to drive the bending tube to bend, the first and second pipe segments can first rotate relative to each other, so that the bending tube can achieve initial bending. During the subsequent pulling of the traction rope, since the bending tube has an initial bending angle, the curvature of the bending tube is relatively large. Even if the bending angle of the bending tube increases, the distal end of the bending tube is not likely to come into contact with the body of the bending tube, and the bending tube can bend normally. At the same time, the bending tube will not twist during the bending process, and the bending direction of the bending tube is controllable.

[0011] Furthermore, compared to the integrated slit-type snake bone, the curved tube in this application, when bent, forms a curved section near its distal end because the first and second tube segments can bend relative to each other under the pull of the traction rope. When the traction rope is pulled further, it provides a relatively larger torque to the tube segment near its distal end, thereby advancing the bending time point of the tube segment near its distal end and making the bending action of the curved tube smoother. Moreover, the advanced bending time point at the distal end of the curved tube further increases the curvature of the curved tube, reducing the space required for the curved tube to bend, which is more conducive to realizing the bending action of the curved tube.

[0012] In addition, the cost of slit-type snake bones is much lower than that of riveted snake bones, and bending tubes can reduce the cost of bending tubes while successfully achieving bending action. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of the bent tube provided in some embodiments of this application. Figure 1 ;

[0015] Figure 2 This application is about Figure 1 Detailed view of point A;

[0016] Figure 3 This is a schematic diagram of the overall structure of the bent tube provided in some embodiments of this application. Figure 2 ;

[0017] Figure 4 This is a schematic diagram of the overall structure of the bent tube provided in some embodiments of this application. Figure 3 ;

[0018] Figure 5 This application is about Figure 4 Detailed view of point B;

[0019] Figure 6 This is a partial structural schematic diagram of a curved tube provided in some embodiments of this application;

[0020] Figure 7 This is a disassembled schematic diagram of a bent tube provided in some embodiments of this application;

[0021] Figure 8 This application is about Figure 7 Detailed image of point G;

[0022] Figure 9 This is a schematic diagram of the overall structure of the bent tube provided in some embodiments of this application. Figure 4 .

[0023] In the diagram: 10-bent pipe, 100-first pipe segment, 110-first gap, 120-first joint, 121-first connecting joint, 130-first riveting part, 200-second pipe segment, 210-second gap, 220-second joint, 221-second connecting joint, 230-second riveting part, 300-rivet, 20-traction rope. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] In various embodiments of this application, "proximal end" and "distal end" refer to the position of the endoscope and its accessories relative to the user in the usage environment. 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".

[0026] This application provides a curved tube 10 for use in an endoscope. The curved tube 10 is the main body of an active bending section, which is a segment in the insertion part of the endoscope capable of enabling the active bending of the tube 10. Exemplarily, the curved tube 10 may be formed together with a heat-shrinkable film covering its exterior to constitute the active bending section.

[0027] For reference Figure 1 , Figure 3 and Figure 4 As shown, the bent pipe 10 includes a first pipe segment 100 and a second pipe segment 200 arranged along its axial direction. The first pipe segment 100 and the second pipe segment 200 are riveted together and can rotate relative to each other.

[0028] The first pipe section 100 has multiple first slits 110 arranged axially on its sidewall, as can be seen from... Figure 2 , Figure 5 and Figure 6 As shown, all the first gaps 110 are divided into two groups, and the two groups of first gaps 110 are arranged opposite each other in the radial direction of the first pipe section 100. In each group of first gaps 110, the arrangement direction of all the first gaps 110 is parallel to the axial direction of the first pipe section 100.

[0029] The first gap 110 forms a deformation space on the first pipe segment 100. Through this deformation space, the pipe segments on both sides of the first gap 110 can approach each other, thereby achieving bending of the first pipe segment 100. The first pipe segment 100 is a one-piece pipe structure, and the first gap 110 can be formed by processes such as cutting and etching. Among them, laser cutting technology is preferred for cutting, as it can optimize processing efficiency and processing accuracy, and the formed first pipe segment 100 has higher overall strength.

[0030] The sidewall of the second pipe segment 200 is provided with at least two second slits 210 arranged axially. All second slits 210 are divided into two groups, which are arranged opposite each other radially in the second pipe segment 200. In each group of second slits 210, the arrangement direction of all second slits 210 is parallel to the axial direction of the second pipe segment 200. Similar to the first pipe segment 100, the second pipe segment 200 achieves its bending action through the second slits 210, and the processing technology of the second slits 210 is the same as that of the first slits 110. Furthermore, the second pipe segment 200 may have at least two second slits 210 arranged opposite each other.

[0031] To achieve the bending of the bending pipe 10, the traction rope 20 is required. The wall of the bending pipe 10 has guide grooves for the traction rope 20 to pass through, which constrain and limit its position. The traction rope 20 is threaded through these guide grooves. The arrangement of the traction rope 20 and the bending pipe 10 can be found in [reference needed]. Figure 6 As shown, by tightening the traction rope 20, the first gap 110 and the second gap 210 can be reduced or expanded.

[0032] Since the first tube segment 100 and the second tube segment 200 achieve bending through the change in the size of the gap, when the first tube segment 100 and the second tube segment 200 are pulled and bent using the traction rope 20, a certain amount of rebound resistance will be generated inside the first tube segment 100 and the second tube segment 200 themselves. The driving force required for the rotation between the joints inside them is relatively large. However, the first tube segment 100 and the second tube segment 200 are riveted together, and the bending resistance of the riveted joint is small. The driving force required is less than the driving force for the rotation between the joints inside the first tube segment 100 or the second tube segment 200 themselves. When the traction rope 20 is pulled to drive the bending tube 10 to achieve the bending action, the first tube segment 100 and the second tube segment 200 can rotate relative to each other first. At this time, the structural shape of the bending tube 10 can be referred to Figure 3 As shown, then comes the rotational bending of the first pipe segment 100 or the second pipe segment 200 itself.

[0033] After the first pipe segment 100 and the second pipe segment 200 rotate relative to each other, the bending pipe 10 achieves initial bending and has a certain bending angle. When the traction rope 20 is pulled further, the curvature of the bending pipe 10 increases. As the bending angle of the bending pipe 10 increases, the distal end of the bending pipe 10 is less likely to come into contact with the pipe body, and the bending pipe 10 can normally achieve the bending action. The structure of the bending pipe 10 bending to the maximum angle provided in this embodiment can be referred to. Figure 9 As shown, Figure 9 In the diagram, the dotted line indicates that the entire curved pipe 10 is a slit-type snake bone, and it is not divided into the first pipe segment 100 and the second pipe segment 200. At the far end of the curved pipe 10, it can be clearly seen that the dotted line will collide with the pipe segment of the curved pipe 10, affecting the continued bending of the curved pipe 10.

[0034] The curved tube 10 provided in this embodiment of the application is divided into a first tube segment 100 and a second tube segment 200, and the first tube segment 100 and the second tube segment 200 are riveted together. This allows the distal end of the curved tube 10 to have a certain bending angle from the initial state. When bending continues, the distal end of the curved tube 10 maintains the bent state. The curvature of the curved tube 10 is large, and the space required for bending is reduced, thereby preventing the distal end of the curved tube 10 from contacting the tube body when bending. Compared with the prior art, the curved tube 10 provided in this embodiment of the application does not require changing the setting position of the traction rope 20, the curved tube 10 will not twist during the bending process, the bending direction of the curved tube 10 is controllable, and it will not affect the use of the endoscope.

[0035] In the prior art, there is also a riveted snake bone, which is more flexible in bending. However, the cost of the riveted snake bone is higher, while the cost of the slit snake bone is lower. The bending tube 10 provided in this application embodiment divides the bending tube 10 into a first tube segment 100 and a second tube segment 200 that are riveted together, thereby reducing the cost of the bending tube 10 while achieving smooth bending.

[0036] Furthermore, compared to the integrated slit-type snake bone, the bending tube 10 provided in this embodiment, when bent, because the first tube segment 100 and the second tube segment 200 can bend relative to each other under the pull of the traction rope 20, the bending tube 10 forms a bending part near its distal end. When the traction rope 20 is pulled further, a relatively larger torque is provided to the tube segment located at the distal end of the bending tube 10, namely the first tube segment 100 or the second tube segment 200. This allows the bending time of the tube segment near its distal end of the bending tube 10 to be advanced, and the overall bending action of the bending tube 10 can be smoother, making the bending operation of the bending tube 10 smoother for the operator.

[0037] Furthermore, since the bending time point of the pipe segment near its distal end of the bent pipe 10 is advanced, the curvature of the bent pipe 10 is further increased, and the space traversed by the bent pipe 10 during the bending process is correspondingly reduced. The bent pipe 10 can achieve the same bending angle in a smaller space, which is more conducive to realizing the bending action of the bent pipe 10.

[0038] In some preferred embodiments, reference may be made to Figure 2 and Figure 5 As shown, when the bent pipe 10 is not bent, the gap width between the first pipe segment 100 and the second pipe segment 200 along the axial direction of the bent pipe 10 is greater than the width of the first gap 110 and the width of the second gap 210. When the bent pipe 10 is not bent, its axis is straight, which is the initial state of the unbent pipe 10. After the bent pipe 10 is bent, the gap width on it will change. The gap between the first pipe segment 100 and the second pipe segment 200 is larger. After the two pipe segments rotate relative to each other, the bent pipe 10 can obtain a more obvious bending amplitude, which is more conducive to the distal end of the bent pipe 10 avoiding the pipe segment of the bent pipe 10 when the bending angle increases, and is also more conducive to the pipe segment located at the distal end of the bent pipe 10 bending first.

[0039] In some embodiments, the first pipe segment 100 includes a plurality of first ribs 120 arranged axially thereon, as can be seen from... Figure 2 , Figure 5 and Figure 6 As shown, the first slit 110 is formed between two adjacent first vertebrae 120. Within the same group of first slits 110, the width of the first vertebrae 120 between two adjacent first slits 110 is the first width. (Reference) Figure 5As shown, the first width is represented by the letter 'c'.

[0040] The second segment 200 includes a plurality of second ribs 220 arranged along its axial direction, as can be referenced. Figure 2 , Figure 5 and Figure 6 As shown, the second slit 210 is formed between two adjacent vertebrae. Within the same group of second slits 210, the width of the second vertebra 220 between two adjacent second slits 210 is the second width. (Reference) Figure 5 As shown, the second width is represented by the letter d.

[0041] It should be noted that there are multiple first vertebrae 120, but only the width of the first vertebrae 120 located between two adjacent first gaps 110 in the same group is the first width. The second width is similar.

[0042] The first width of the portion of the first segment 120 adjacent to the riveting position is equal to the second width of the portion of the second segment 220 adjacent to the riveting position. It can be understood that the riveting position is on one side of the first segment 120 and on the other side of the second segment 220. Among the plurality of first segments 120, a portion of the first segments 120 are adjacent to the riveting position, and among the plurality of second segments 220, a portion of the second segments 220 are adjacent to the riveting position. In some embodiments, the first width of the first segment 120 and the second width of the second segment 220 adjacent to the riveting position are equal. During the bending process of the bent tube 10, the bending trajectory is more controllable. After the bending angle of the bent tube 10 increases, a suitable distance can exist between the inner and outer rings of the bent tube 10, avoiding interference and obstruction of the field of vision caused by the inner and outer rings being too close together.

[0043] In other embodiments, the second pipe segment 200 may be located at the distal end of the first pipe segment 100, and the first width is greater than the second width. During the bending process of the bent pipe 10, the smaller second width makes it easier for the second pipe segment 200, located at the distal end of the bent pipe 10, to bend before the first pipe segment 100. This facilitates the bending effect of bending the distal end of the bent pipe 10 first and then the proximal end. Moreover, the curvature of the bent pipe 10 is larger, making it less likely for the distal end of the bent pipe 10 to collide with the pipe body of the bent pipe 10.

[0044] In some alternative embodiments, the first pipe segment 100 may be located at the far end of the second pipe segment 200, and the second width may be greater than the first width.

[0045] The first joint 120 of the first pipe segment 100, which is close to the second pipe segment 200, is the first connecting joint 121, which can be referenced. Figure 2 , Figure 5 and Figure 6As shown, the second joint 220 of the second pipe segment 200, adjacent to the second joint 220 of the first pipe segment 100, is the second connecting joint 221. In some embodiments, reference may be made to... Figure 5 As shown, in the first pipe segment 100, the width of the first connecting joint 121 is greater than the width of the adjacent first joint 120, and the width of the first connecting joint 121 is represented by the letter e; in the second pipe segment 200, the width of the second connecting joint 221 is greater than the width of the adjacent second joint 220, and the width of the second connecting joint 221 is represented by the letter f.

[0046] The riveting between the first pipe segment 100 and the second pipe segment 200 is actually the riveting between the first connecting joint 121 and the second connecting joint 221. The first connecting joint 121 and the second connecting joint 221 are two independent joints. When the first pipe segment 100 and the second pipe segment 200 rotate relative to each other, the first connecting joint 121 and the second connecting joint 221 need to withstand relatively significant internal forces. The wider the width of the two joints, the higher their structural strength, which can reduce the risk of damage to a certain extent, thereby increasing the service life of the bent pipe 10. When the first connecting joint 121 and the second connecting joint 221 are directly riveted together by rivets 300, they abut against each other during rotation.

[0047] Preferably, the second pipe segment 200 is located at the distal end of the first pipe segment 100, and the width of the first joint 120 between two adjacent first gaps 110 is greater than the width of the second joint 220 between two adjacent second gaps 210. The smaller the width of the second joint 220 corresponding to the second pipe segment 200, the greater the curvature when the bending pipe 10 is bent, and the easier it is to bend the bending pipe 10. Furthermore, since the second pipe segment 200 is located at the distal end, it is more conducive to achieving the bending effect of bending the distal end of the bending pipe 10 first and then bending the proximal end.

[0048] In some other preferred embodiments, the first slot 110 adjacent to the second pipe segment 200 and the second slot 210 adjacent to the first pipe segment 100 face the same side of the curved pipe 10, as can be seen from... Figure 5 and Figure 6As shown. The first gap 110 adjacent to the second pipe segment 200 refers to the first gap 110 in the first pipe segment 100 that is closest to the second pipe segment 200; the second gap 210 adjacent to the first pipe segment 100 refers to the second gap 210 in the second pipe segment 200 that is closest to the first pipe. The first gap 110 and the second gap 210 face the same side of the bent pipe 10. Since the first gap 110 and the second gap 210 are the gaps closest to each other, when the bent pipe 10 is bent, the degree of bendability can be achieved on this side, and the bending angle of the bent pipe 10 towards this side is larger. When the bent pipe 10 is bent towards the other side, its degree of bend and bending angle are not as good as on this side. This is suitable for some scenarios where there are requirements for the bending angle of the bent pipe 10 on one side. At the same time, there is no need to make major modifications to the bent structure. It is only necessary to pay attention to the orientation of the first gap 110 and the second gap 210 when riveting the first pipe segment 100 and the second pipe segment 200.

[0049] In some embodiments of this application, the first pipe segment 100 and the second pipe segment 200 can be directly riveted together, with rivets 300 directly connecting them. In other embodiments, the first pipe segment 100 and the second pipe segment 200 can also be indirectly riveted together, with a third pipe segment connecting them.

[0050] For reference Figure 7 and Figure 8 As shown, the bent pipe 10 also includes rivets 300. The first pipe segment 100 has a first riveting portion 130, and the second pipe segment 200 has a second riveting portion 230. The first riveting portion 130 and the second riveting portion 230 are connected by rivets 300. Both the first pipe segment 100 and the second pipe segment 200 are rotatable about the axis of the rivet 300. There may be two rivets 300, which are arranged opposite each other in the radial direction of the bent pipe 10.

[0051] In the case where the curved pipe 10 also includes a third pipe segment, the third pipe segment is connected between the first pipe segment 100 and the second pipe segment 200. The third pipe segment includes at least one riveted serpentine, which is connected to the first pipe segment 100 and the second pipe segment 200 by rivets 300. When the number of riveted serpentine is greater than one, adjacent riveted serpentine are also connected by rivets 300.

[0052] The third segment of the snake-bone structure is more prone to bending under the pull of the traction rope 20, and can bend at a greater angle. This reduces the space required for the bending tube 10 and allows the segment at the far end of the third segment to bend first. In practical use, the number of riveted snake bones can be selected according to the maximum bending angle of the required bending tube 10.

[0053] In some embodiments provided in this application, when the curved tube 10 is not bent, the width of the first gap 110 is equal to the width of the second gap 210 in the axial direction of the curved tube 10. This facilitates processing and makes the bending trajectory and shape more controllable when the curved tube 10 is bent. Moreover, when the first width of the first joint 120 is equal to the second width of the second joint 220, the shape of the bent tube 10 is more controllable, and there is a suitable spacing between the joints of different layers in its radial direction.

[0054] This application provides an insertion part, including the curved tube 10 provided in any of the above embodiments. The insertion part is used for insertion into a human body cavity for examination or surgery.

[0055] This application also provides an endoscope, including the insertion part provided in the above embodiments. The endoscope further includes a handle connected to the insertion part, and the bending direction and bending angle of the bending tube 10 of the insertion part can be controlled by operating the handle.

[0056] The endoscopes involved in the embodiments of this application may be bronchoscopes, pyeloscopes, esophagoscopes, gastroscopes, colonoscopes, otoscopes, rhinoscopes, oral endoscopes, laryngoscopes, colposcopes, laparoscopes, arthroscopes, etc. The embodiments of this application do not specifically limit the types of endoscopes.

[0057] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A curved pipe, characterized in that, For use in endoscopes, the curved tube (10) includes a first tube segment (100) and a second tube segment (200) arranged along its axial direction, and the first tube segment (100) and the second tube segment (200) are riveted together; The sidewall of the first pipe segment (100) is provided with a plurality of first slots (110) arranged along its axial direction. All the first slots (110) are divided into two groups, and the two groups of first slots (110) are arranged opposite to each other in the radial direction of the first pipe segment (100). The sidewall of the second pipe section (200) is provided with at least two second slits (210) arranged along its axial direction. All the second slits (210) are divided into two groups, and the two groups of second slits (210) are arranged opposite each other in the radial direction of the second pipe section (200). The first pipe segment (100) includes a plurality of first ribs (120) arranged along its axial direction, and the first gap (110) is formed between two adjacent first ribs (120). The second pipe segment (200) includes a plurality of second ribs (220) arranged along its axial direction, and the second gap (210) is formed between two adjacent second ribs (220). The first segment (100) of the first segment (100) is connected to the first joint (120) of the second segment (200) by a first connecting joint (121). In the first segment (100), the width of the first connecting joint (121) is greater than the width of the first joint (120) adjacent to it. The second segment (200) near the second joint (220) of the first segment (100) is the second connecting joint (221). In the second segment (200), the width of the second connecting joint (221) is greater than the width of the second joint (220) adjacent to it.

2. A bent pipe according to claim 1, characterized in that, When the bent pipe (10) is not bent, the gap width between the first pipe segment (100) and the second pipe segment (200) in the axial direction of the bent pipe (10) is greater than the width of the first gap (110) and the width of the second gap (210).

3. A curved pipe according to claim 1, characterized in that, In the same group of first gaps (110), the width dimension of the first joint (120) between two adjacent first gaps (110) is the first width; In the same group of second gaps (210), the width dimension of the second joint (220) between two adjacent second gaps (210) is the second width; The first width of the portion of the first segment (120) adjacent to the riveting position and the second width of the portion of the second segment (220) adjacent to the riveting position are equal, or the second pipe segment (200) is located at the far end of the first pipe segment (100), and the first width is greater than the second width.

4. A bent pipe according to claim 1, characterized in that, The second tube segment (200) is located at the far end of the first tube segment (100), and the width of the first joint (120) between two adjacent first gaps (110) is greater than the width of the second joint (220) between two adjacent second gaps (210).

5. A bent pipe according to claim 1, characterized in that, The first slot (110) adjacent to the second pipe segment (200) and the second slot (210) adjacent to the first pipe segment (100) face the same side of the curved pipe (10).

6. A curved pipe according to claim 1, characterized in that, The curved pipe (10) further includes a rivet (300), the first pipe segment (100) has a first riveting part (130), the second pipe segment (200) has a second riveting part (230), and the first riveting part (130) and the second riveting part (230) are connected by the rivet (300); Alternatively, the curved pipe (10) may further include a third pipe segment connected between the first pipe segment (100) and the second pipe segment (200). The third pipe segment includes at least one riveted serpentine, which is connected to the first pipe segment (100) and the second pipe segment (200) by a rivet (300). If the number of riveted serpentine is greater than one, two adjacent riveted serpentine are connected by a rivet (300).

7. A bent pipe according to claim 1, characterized in that, When the curved tube (10) is not bent, the width of the first gap (110) is equal to the width of the second gap (210) in the axial direction of the curved tube (10).

8. An insertion part, characterized in that, Includes the bent tube (10) as described in any one of claims 1-7.

9. An endoscope, characterized in that, Includes the insertion portion as described in claim 8.

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