Endoscope and its bending structure

Abstract

The present application relates to an endoscope and a bending structure thereof, comprising a tube body, the tube body comprising a second bending part; the second bending part comprising a plurality of connecting segments, two adjacent connecting segments being pivotally connected through at least one set of connecting assemblies, end faces of the connecting segments and on both sides of the connecting assemblies being formed with abutting faces, the abutting faces being concave so as to form a rotation space on both sides of the connecting assemblies between the two adjacent connecting segments, when the second bending part is bent by rotating the plurality of connecting segments along the connecting assemblies, one side abutting face rotates through the rotation space and is pressed on the other side abutting face. In the above scheme, the two connecting segments can rotate relative to each other, a rotation space is cut out on the opposite two end faces as a rotation stroke, and then the two adjacent connecting segments can be rotated at a certain angle until the two abutting faces abut, so that the second bending part can be bent under pressure and smoothly enter the curved intestinal tract when the second bending part extends into the intestinal tract, which is convenient for the examination of intestinal lesions and improves the examination efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical equipment, in particular to an endoscope and a bending structure thereof. BACKGROUND

[0002] A colonoscope is an elongated and bendable medical instrument with a diameter of about 1 cm. The colonoscope enters the rectum through the anus and reaches the large intestine, allowing doctors to observe the inside of the colon and large intestine. Colonoscopy is a diagnostic method used by doctors to examine the inside of the large intestine and colon. Due to the tortuous shape of the intestinal tract, the colonoscope usually needs to have a passive bending function when performing a colonoscopy to successfully reach the lesion site. In the existing bending structure, the bending performance is generally poor and cannot bend at multiple angles. The structure is unstable and the rivets in the structure have the risk of falling off when bending. SUMMARY

[0003] To solve the above problems, the first object of the present application is to provide a bending structure of an endoscope, which is more stable. When the colonoscope is inserted into the intestinal tract and encounters a bend in the intestinal tract, the front end of the bending structure is pressed by the intestinal wall, and can be bent at a certain amplitude, facilitating the insertion of the colonoscope into the intestinal tract along the direction of the intestinal tract. The second object of the present application is to provide an endoscope having the above-mentioned bending structure.

[0004] To achieve the above-mentioned objects, the present application adopts the following technical solutions: a tube body, a wire arranged in the tube body, and a rubber sleeve covering the outer side of the tube body, the tube body comprising a first bending portion and a second bending portion connected thereto; characterized in that:

[0005] The second bending portion comprises a plurality of connection segments connected to each other, and the adjacent two connection segments are pivotally connected by at least one set of connection assemblies. The end faces of the connection segments and the two sides of the connection assemblies are formed with abutting surfaces. The abutting surfaces are concave surfaces to form a rotation space between the adjacent two connection segments on the two sides of the connection assemblies. When the second bending portion is bent by the rotation of the plurality of connection segments along the connection assemblies, one side abutting surface rotates through the rotation space and is pressed on the other side abutting surface.

[0006] In the above technical solution, the second bending portion can be passively bent when pressed by the intestinal wall. The second bending portion comprises a plurality of connection segments, and the adjacent connection segments are pivotally connected by connection assemblies, i.e., the two connection segments can rotate relative to each other. The connection segments are small pipe fittings. In order to enable effective rotation between the connection segments, a rotation space is cut out on the opposite two end faces as a rotation stroke, so that the adjacent two connection segments can be rotated at a certain angle until the two abutting surfaces abut each other. Thus, when the second bending portion is inserted into the intestinal tract, it can be bent by pressure and smoothly enter the tortuous intestinal tract, facilitating the examination of the intestinal tract lesions and improving the examination efficiency.

[0007] Preferably, there are multiple sets of the connecting components, and the multiple sets of connecting components are regularly distributed between the two connecting segments. In this technical solution, there are multiple sets of connecting components so that the second bending portion can be bent in multiple directions, which is convenient for dealing with complex intestinal structures. In addition, the symmetrical arrangement minimizes the interference between the connecting components when the connecting segments rotate relative to each other, and at the same time makes the structure more stable.

[0008] Preferably, the connecting component includes a ring arm formed on the end face of the connecting segment and extending axially outward, and an arc-shaped buckle formed on the adjacent connecting segment end face and extending relative to the ring arm; annular grooves are formed on both sides of the arc-shaped buckle, and the ring arm can be snap-connected with the arc-shaped buckle and rotate along the annular groove. In this technical solution, the ring arm can embrace and tightly hold the arc-shaped buckle, so that it is not easy to disengage when the two rotate relative to each other; when the tube body is vertical, a gap is formed between the front end of the ring arm and the annular groove, and this gap is the rotation stroke of the ring arm; moreover, the ring arm and the arc-shaped buckle are formed by laser cutting on the tube body, with stable structure, convenient production and cost saving, reducing rivet connection and being more environmentally friendly.

[0009] Preferably, angles are formed on both sides of the rotation space at the side wall of the ring arm, and the angle of the angle is 4-8°. In this technical solution, in the existing bending structure, a relatively large rotation space is usually formed between two segments to obtain the maximum bending amplitude. However, such a structure is often prone to loosening and is easily bent when encountering the intestinal wall, resulting in difficulty in entering the intestine. In this case, the distance between the rotation spaces between the two segments is greatly reduced (the rotation angle is reduced). Although the rotation amplitude is small, it also makes the passively bent structure more stable, is easy to slide into the intestine when encountering the intestinal wall, is not easy to loosen, and has a longer service life. It should be noted here that when the above angle is set to 6°, the rotation distance and the structural stability are optimal.

[0010] Preferably, a limiting member extends axially outward on one of the mutually pressed abutting surfaces, and a limiting groove is correspondingly provided on the other surface. The limiting member is clamped in the limiting groove and a limiting space is formed between the end portion and the bottom of the limiting groove. In this technical solution, since the two connecting segments can rotate relative to each other, to prevent the risk of the ring arm disengaging when being overly squeezed and to keep the structure more stable, the limiting member and the limiting groove are respectively provided on the opposite abutting surfaces to prevent the adjacent two connecting segments from continuing to rotate after abutting and causing the ring arm to fall off from the annular groove. Similarly, during the abutting process of the two side abutting surfaces, the limiting space serves as a limiting stroke to enable the limiting member to move relative to the limiting groove. It should be noted here that when the tube body is vertical, a part of the limiting member has been clamped into the limiting groove, the tube body has good stability, and during bending and clamping, the movement is more accurate.

[0011] Preferably, the contact surface is a regular arc surface that gradually concaves towards the center from both sides, and the limiting member and the limiting groove are respectively disposed at the lowest point in the middle of the two contact surfaces. In this technical solution, the limiting groove and the limiting member are correspondingly disposed at the lowest point in the middle of the contact surface, so that the force between the two connecting sections is more uniform when the limiting groove and the limiting member abut. Furthermore, for a single set of corresponding limiting members and limiting grooves, the limiting area is maximized, making the structure more stable. It should be noted that there can be multiple sets of corresponding limiting members and limiting grooves. Multiple limiting members can also achieve a good limiting effect by being symmetrically arranged relative to the lowest point.

[0012] Preferably, the connecting assembly has two sets; the ring arm and the limiting groove are formed on one end face of the connecting section, and the arc-shaped buckle and the limiting member are formed on the other end face of the connecting section; the angle between the straight line from the center of the ring arm to the axis of the pipe body and the straight line from the center of the limiting groove to the axis of the pipe body is 90°, and the angle between the straight line from the center of the arc-shaped buckle to the axis of the pipe body and the straight line from the center of the limiting member to the axis of the pipe body is 90°. In this technical solution, the connecting assembly has two sets, and the limiting member is set at the lowest point of the contact surface on both sides of the connecting assembly. Therefore, on the same end face, the ring arm and the limiting groove are at opposite 90°, and the arc-shaped buckle and the limiting member are at opposite 90°. Figure 3 As can be seen, when the row of arc-shaped buckles at point A rotates, the limiting piece at point B, which is at 90° to it, abuts against the limiting groove, resulting in the best limiting effect.

[0013] Preferably, the second curved portion includes multiple first connecting segments, second connecting segments, and third connecting segments. One end face of the first connecting segment is formed with a first ring arm and a first limiting groove, and the other end face is formed with a first arc-shaped buckle and a first limiting member. One end face of the second connecting segment is formed with a second ring arm and a second limiting groove, and the other end face is formed with a second arc-shaped buckle and a second limiting member. One end face of the third connecting segment is formed with a third ring arm and a third limiting groove, and the other end face is formed with a third arc-shaped buckle and a third limiting member. The first limiting member engages with the second limiting groove, and the first arc-shaped buckle rotats into the second ring arm. The second limiting member engages with the third limiting groove, and the second arc-shaped buckle rotats into the third ring arm. The included angle between the adjacent straight lines from the centers of the first, second, and third arc-shaped buckles to the center of the tube body is 60°. In this technical solution, the second curved section comprises a rotating group consisting of a first connecting segment, a second connecting segment, and a third connecting segment connected sequentially. When the second curved section bends in one direction, this group rotates relative to the other, effectively maintaining the overall structural stability of the second curved section and preventing loosening due to the mutual rotation of two small connecting segments. The arc-shaped buckles of the first, second, and third connecting segments are at a relative angle of 60°, allowing for smooth assembly and bending in multiple directions. Figure 3As shown, at point A, it can rotate in two directions along the pivot end. After rotating 60°, it can rotate in two directions along the pivot end again. In addition, this structure allows the pivot connections within a group to be staggered. When bending, the three connecting segments maintain a certain connection strength, resulting in better overall integrity.

[0014] Preferably, the second bending section further includes a head connecting section and an end connecting section; one end of the head connecting section is screwed to the first bending section, and the other end is formed with a head limiting groove and a head ring arm; one end of the end connecting section is screwed to a metal pipe, and the other end is formed with an end arc buckle and an end limiting member; the head limiting groove and the third limiting member form a snap-fit ​​connection, and the head ring arm and the third arc buckle form a rotatable snap-fit ​​connection; the end arc buckle and the first ring arm form a rotatable snap-fit ​​connection, and the end limiting member and the first limiting groove form a snap-fit ​​connection. In this technical solution, the head connecting section is fixedly connected to the first bending section (snake-bone part) and connected to the third connecting section, and the end connecting section is fixedly connected to the front detection metal pipe and connected to the first connecting section. Thus, the middle section consists of three rotating groups, which is a reasonable structural design and can maximize the bending range of the second bending section.

[0015] An endoscope comprising any of the aforementioned curved structures. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the planar structure of the tube body of a curved endoscope.

[0017] Figure 2 This is a three-dimensional structural diagram of the tube body of a curved endoscope.

[0018] Figure 3 for Figure 2 Enlarged view of point M in the image.

[0019] Figure 4 This is a schematic diagram of the connection between the connecting segments.

[0020] Figure 5 This is a schematic diagram showing the connections between the first connecting segment, the second connecting segment, and the third connecting segment.

[0021] Figure 6 This is a three-dimensional structural diagram of the first connecting section.

[0022] Figure 7 This is a schematic diagram of the three-dimensional structure of the end connection segment. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] Example 1:

[0029] likeFigures 1 to 7 The diagram illustrates a curved structure for an endoscope, comprising a tube body, wiring passing through the tube body, and a rubber sleeve covering the outside of the tube body. The tube body includes a first curved portion 1 and a second curved portion 2 connected together. The second curved portion 2 includes multiple interconnected connecting segments 3, with adjacent connecting segments 3 pivotally connected by at least one set of connecting components. Each connecting segment 3 has an abutment surface 4 formed on its end face and on both sides of the connecting component. The abutment surface 4 is concave, creating a rotational space 5 between adjacent connecting segments 3 on both sides of the connecting component. When the multiple connecting segments 3 rotate along the connecting component, causing the second curved portion 2 to bend, one abutment surface 4 rotates through the rotational space 5 and presses against the other abutment surface 4.

[0030] In the above technical solution, the second curved portion 2 can be passively bent when compressed by the intestinal wall. The second curved portion 2 includes multiple connecting segments 3, and adjacent connecting segments 3 are pivotally connected by connecting components, meaning that the two connecting segments can rotate relative to each other. The connecting segments 3 are small tubular sections. To enable effective rotation between the connecting segments 3, a rotation space 5 is cut out on the two opposite end faces as the rotation stroke, so that adjacent connecting segments 3 can rotate at a certain angle until the two abutting surfaces 4 abut against each other. This allows the second curved portion 2 to bend under pressure and smoothly enter the tortuous intestine when it is inserted into the intestine, facilitating the examination of intestinal lesions and improving examination efficiency.

[0031] Furthermore, the connecting components are in multiple sets, regularly distributed between the two connecting segments. In this technical solution, having multiple sets of connecting components allows the second bending portion 2 to bend in multiple directions, facilitating the handling of complex intestinal structures. In addition, the symmetrical arrangement minimizes interference between the connecting components when the connecting segments 3 rotate relative to each other, while also making the structure more stable.

[0032] Furthermore, the connecting assembly includes a ring arm 6 formed on the end face of the connecting segment 3 and extending outward along the axial direction, and an arc-shaped buckle 7 formed on the end face of the adjacent connecting segment 3 and extending opposite to the ring arm 6; the arc-shaped buckle 7 forms annular grooves 8 on both sides, and the ring arm 6 can be snapped into the arc-shaped buckle 7 and rotate along the annular grooves 8. In this technical solution, the ring arm 6 can tightly hold the arc-shaped buckle 7, making it difficult for the two to separate when rotating; when the tube is vertical, a gap is formed between the front end of the ring arm 6 and the annular groove 8, and this gap is the rotation stroke of the ring arm 6; moreover, the ring arm and the arc-shaped buckle are laser-cut into shape on the tube, resulting in a stable structure, convenient production, cost savings, reduced rivet connections, and greater environmental friendliness.

[0033] Furthermore, the two sides of the rotation space 5 form an angle at the side wall of the ring arm 6, the angle being 4-8°. In this technical solution, existing bending structures typically form a large rotation space between two segments to achieve the maximum bending amplitude. However, such structures are often prone to loosening and are easily bent when encountering the intestinal wall, making it difficult to enter the intestine. In this case, the distance of the rotation space 5 between the two segments is greatly reduced (the rotation angle is reduced). Although the rotation amplitude is small, it also makes the passively bent structure more stable, making it easier to slide into the intestine when encountering the intestinal wall, less prone to loosening, and with a longer service life. It should be noted that when the above angle is set to 6°, the rotation distance and structural stability are optimal.

[0034] Furthermore, a limiting member 9 extends outward along the axial direction on one side of the mutually pressing contact surfaces 4, and a corresponding limiting groove 10 is provided on the other side. The limiting member 9 is engaged with the limiting groove 10, and a limiting space 11 is formed between its end and the bottom of the limiting groove 10. In this technical solution, since the two connecting segments 3 can rotate, to prevent the ring arm 6 from detaching under excessive compression and to maintain structural stability, limiting members 9 and limiting grooves 10 are respectively provided on the opposing contact surfaces 4 to prevent the ring arm 6 from falling off the annular groove after the adjacent connecting segments 3 continue to rotate after contact. Similarly, during the contact process of the two contact surfaces 4, the limiting space acts as a limiting stroke, allowing the limiting member to move relative to the limiting groove.

[0035] It should be noted that when the tube is vertical, the limiting component is already partially engaged in the limiting groove, resulting in good tube stability and more precise movement when bending and engaging.

[0036] Furthermore, the contact surface 4 is a regular arc surface that gradually concaves towards the center from both sides, and the limiting member 9 and the limiting groove 10 are respectively disposed at the lowest point in the middle of the two contact surfaces 4. In this technical solution, the limiting groove 9 and the limiting member 10 are correspondingly disposed at the lowest point in the middle of the contact surface 4, so that when the limiting groove 9 and the limiting member 10 abut, the force between the two connecting segments 3 is more uniform, and for a single set of corresponding limiting members 9 and limiting grooves 10, the limiting area is maximized, making the structure more stable. It should be noted that there can be multiple sets of limiting members and limiting grooves, and multiple limiting members can be symmetrically arranged relative to the lowest point to achieve a good limiting effect.

[0037] Furthermore, the connecting components are in two sets; the ring arm 6 and the limiting groove 10 are formed on one end face of the connecting section 3, and the arc-shaped buckle 7 and the limiting member 9 are formed on the other end face of the connecting section 3; the angle between the straight line from the center of the ring arm 6 to the axis of the pipe body and the straight line from the center of the limiting groove 10 to the axis of the pipe body is 90°, and the angle between the straight line from the center of the arc-shaped buckle 7 to the axis of the pipe body and the straight line from the center of the limiting member 9 to the axis of the pipe body is 90°. In this technical solution, the connecting components are in two sets, and the limiting member 9 is located at the lowest point of the abutment surface 4 on both sides of the connecting components. Therefore, on the same end face, the ring arm 6 and the limiting groove 10 are at opposite 90°, and the arc-shaped buckle and the limiting member are at opposite 90°. Figure 3 As can be seen, when the row of arc-shaped buckles at point A rotates, the limiting piece at point B, which is at 90° to it, abuts against the limiting groove, resulting in the best limiting effect.

[0038] Further, the second curved portion 2 includes multiple segments: a first connecting segment 100, a second connecting segment 200, and a third connecting segment 300. One end face of the first connecting segment 100 is formed with a first ring arm 101 and a first limiting groove 102, and the other end face is formed with a first arc-shaped buckle 103 and a first limiting member 104. One end face of the second connecting segment 200 is formed with a second ring arm 201 and a second limiting groove 202, and the other end face is formed with a second arc-shaped buckle 203 and a second limiting member 204. One end face of the third connecting segment 300 is formed with a third ring arm 301 and a third limiting groove 302, and the other end face is formed with a third arc-shaped buckle 303 and a third limiting member 304.

[0039] The first limiting member 104 and the second limiting groove 202 are engaged, and the first arc-shaped buckle 103 and the second ring arm 201 are connected in a rotatable buckle connection.

[0040] The second limiting member 204 and the third limiting groove 302 are engaged, and the second arc-shaped buckle 203 and the third ring arm 301 are connected in a rotatable buckle connection.

[0041] The included angle between the straight lines from the centers of the first arc-shaped buckle 103, the second arc-shaped buckle 203, and the third arc-shaped buckle 303 to the center of the tube body is 60°.

[0042] In the above technical solution, the second curved section comprises a rotating group consisting of a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence. When the second curved section bends in one direction, one group rotates relative to another, effectively maintaining the overall structural stability of the second curved section and preventing loosening due to the mutual rotation of two small connecting segments. The arc-shaped buckles of the first, second, and third connecting segments are at a relative angle of 60°, meaning the arc-shaped buckle on one segment and its ring arm are at a relative angle of 60°. This allows for smooth assembly of the three segments and enables bending in multiple directions. Figure 3As shown, at point A, it can rotate in two directions along the pivot end. After rotating 60°, it can rotate in two directions along the pivot end again. In addition, this structure allows the pivot connections within a group to be staggered. When bending, the three connecting segments maintain a certain connection strength, resulting in better overall integrity.

[0043] Furthermore, the second curved portion 2 also includes a head connecting section 400 and an end connecting section 500; one end of the head connecting section 400 is screwed to the first curved portion 1, and the other end is formed with a head limiting groove 401 and a head ring arm 402; one end of the end connecting section 500 is screwed to a metal pipe fitting, and the other end is formed with an end arc buckle 501 and an end limiting member 502; the head limiting groove 401 and the third limiting member 304 are engaged, and the head ring arm 402 and the third arc buckle 303 are rotatably engaged; the end arc buckle 501 and the first ring arm 101 are rotatably engaged, and the end limiting member 502 and the first limiting groove 102 are engaged. In this technical solution, the first end connecting section is fixedly connected to the first curved section (snake bone part) and connected to the third connecting section. The end connecting section is fixedly connected to the front detection metal pipe and connected to the first connecting section. Thus, the middle section consists of three rotating groups. The structure is reasonably designed and can achieve the bending of the second curved section to the maximum extent.

[0044] In this specific embodiment, the existing colonoscope's curved structure suffers from problems such as limited flexibility and inability to bend in multiple directions, poor structural stability, and the tendency for rivets to fall off during bending, as well as poor environmental performance. The above solution addresses these issues by cutting a tube into multiple segments, allowing two segments to rotate relative to each other at a certain angle under pressure. This angle is adjusted to a specific value by reducing the rotation space between the segments, thus improving the overall stability of the tube structure. Furthermore, the design redesigns allow rotation in two directions between every three segments, further ensuring overall stability and increasing the bending angle, making it easier to insert into the complex intestinal tract and improving detection efficiency.

[0045] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

[0047] Example 2:

[0048] An endoscope including the curved structure of Embodiment 1.

Claims

1. A curved structure for an endoscope, comprising a tube body, wiring passing through the tube body, and a rubber sleeve covering the outside of the tube body, wherein the tube body includes a first curved portion (1) and a second curved portion (2) connected together; characterized in that: The second curved portion (2) includes multiple interconnected connecting segments (3). Adjacent connecting segments (3) are pivotally connected by at least one set of connecting components. Each connecting segment (3) has an abutment surface (4) on its end face and on both sides of the connecting component. The abutment surface (4) is concave so that a rotation space (5) is formed between adjacent connecting segments (3) on both sides of the connecting component. When the multiple connecting segments (3) rotate along the connecting component to bend the second curved portion (2), one abutment surface (4) rotates through the rotation space (5) and presses against the other abutment surface (4). The connecting components are in multiple sets, and the multiple sets of connecting components are regularly distributed between the two connecting segments; the connecting components include a ring arm (6) formed on the end face of the connecting segment (3) and extending outward along the axial direction, and an arc-shaped buckle (7) formed on the end face of the adjacent connecting segment (3) and extending relative to the ring arm (6); the arc-shaped buckle (7) forms an annular groove (8) on both sides, and the ring arm (6) can be snapped into the arc-shaped buckle (7) and rotate along the annular groove (8); the two sides of the rotation space (5) form an angle at the side wall of the ring arm (6), and the angle of the angle is 4 to 8°.

2. The curved structure of an endoscope according to claim 1, characterized in that: One side of the mutually pressing contact surface (4) is provided with a limiting member (9) extending outward along the axial direction, and the other side is provided with a corresponding limiting groove (10). The limiting member (9) is engaged with the limiting groove (10) and a limiting space (11) is formed between its end and the bottom of the limiting groove (10).

3. The curved structure of an endoscope according to claim 2, characterized in that: The contact surface (4) is a regular arc surface that gradually concaves from both sides to the middle, and the limiting member (9) and the limiting groove (10) are respectively set at the lowest point in the middle of the contact surface (4) on both sides.

4. The curved structure of an endoscope according to claim 3, characterized in that: The connecting components are in two sets; the ring arm (6) and the limiting groove (10) are formed on one side end face of the connecting section (3), and the arc buckle (7) and the limiting member (9) are formed on the other side end face of the connecting section (3); the angle between the straight line from the center of the ring arm (6) to the axis of the pipe body and the straight line from the center of the limiting groove (10) to the axis of the pipe body is 90°, and the angle between the straight line from the center of the arc buckle (7) to the axis of the pipe body and the straight line from the center of the limiting member (9) to the axis of the pipe body is 90°.

5. The curved structure of an endoscope according to claim 4, characterized in that: The second curved portion (2) includes multiple first connecting segments (100), second connecting segments (200), and third connecting segments (300). One end face of the first connecting segment (100) is formed with a first ring arm (101) and a first limiting groove (102), while the other end face is formed with a first arc-shaped buckle (103) and a first limiting member (104). One end face of the second connecting segment (200) is formed with a second ring arm (201) and a second limiting groove (202), while the other end face is formed with a second arc-shaped buckle (203) and a second limiting member (204). One end face of the third connecting segment (300) is formed with a third ring arm (301) and a third limiting groove (302), while the other end face is formed with a third arc-shaped buckle (303) and a third limiting member (304). The first limiting member (104) and the second limiting groove (202) are engaged, and the first arc-shaped buckle (103) and the second ring arm (201) are connected in a rotatable buckle connection. The second limiting member (204) and the third limiting groove (302) are engaged, and the second arc-shaped buckle (203) and the third ring arm (301) are connected in a rotatable buckle connection; The included angle between the straight lines from the center of the first arc-shaped buckle (103), the second arc-shaped buckle (203) and the third arc-shaped buckle (303) to the center of the tube body is 60°.

6. The curved structure of an endoscope according to claim 5, characterized in that: The second curved portion (2) further includes a head connecting section (400) and an end connecting section (500); one end of the head connecting section (400) is screwed to the first curved portion (1), and the other end is formed with a head limiting groove (401) and a head ring arm (402); one end of the end connecting section (500) is screwed to a metal pipe fitting, and the other end is formed with an end arc buckle (501) and an end limiting member (502); the head limiting groove (401) and the third limiting member (304) form a snap-fit ​​connection, and the head ring arm (402) and the third arc buckle (303) form a rotatable snap-fit ​​connection; the end arc buckle (501) and the first ring arm (101) form a rotatable snap-fit ​​connection, and the end limiting member (502) and the first limiting groove (102) form a snap-fit ​​connection.

7. An endoscope, characterized in that: Including the curved structure of the endoscope as described in any one of claims 1 to 6.

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