Bent tube, passive bending section, insertion part and endoscope

Abstract

The utility model provides a bent pipe, a passive bent section, an insertion part and an endoscope, and relates to the technical field of endoscopes, the bent pipe is used for the passive bent section of the endoscope, the far end of the bent pipe is used for being connected with an active bent section of the endoscope, the bent pipe comprises a gap, the gap penetrates into the bent pipe, and the passive bent section is arranged in the gap. The gaps are at least formed in the portion, close to one side of the far end, of the bent pipe, and the multiple gaps are distributed in the axial direction of the bent pipe. The radial depths of the gaps are gradually reduced in the direction from the far end to the near end of the bent pipe. The scheme at least can be used for solving the problem of low controllability of the insertion part in the related technology.

Description

Technical Field

[0001] The present application relates to the technical field of endoscopes, and particularly to a bending tube, a passive bending section, an insertion portion and an endoscope. Background Art

[0002] An endoscope is a medical device widely used in the medical field. It can directly enter the natural ducts of the human body for examination, providing sufficient diagnostic information for doctors to effectively treat diseases. The insertion portion includes a passive bending section and an active bending section connected to the distal end of the passive bending section. During the insertion process, the passive bending section can cooperate with the movement of the active bending section to help the endoscope smoothly pass through complex human body cavities.

[0003] In the related art, the operator can circumferentially rotate the insertion portion outside the patient's body to adjust the bendable direction of the insertion portion inside the patient. However, in actual operation, it is often found that this circumferential rotation is difficult to effectively transmit to the insertion portion, resulting in the insertion portion being unable to achieve the expected bending action and the operation effect being unsatisfactory. Summary of the Utility Model

[0004] The present application discloses a bending tube, a passive bending section, an insertion portion and an endoscope to solve the technical problem of low controllability of the insertion portion in the related art.

[0005] In a first aspect, the present application provides a bending tube for the passive bending section of an endoscope. The distal end of the bending tube is used to connect the active bending section of the endoscope. The bending tube includes slits that penetrate into the interior of the bending tube. The slits are at least provided in a part of the bending tube near its distal end side, and multiple slits are arranged along the axial direction of the bending tube; along the direction from the distal end to the proximal end of the bending tube, the radial depth of each slit gradually decreases.

[0006] In some embodiments, the multiple slits include multiple slit groups distributed along the axial direction of the bending tube. Among them, the radial depth of the slits in the slit group closer to the distal end of the bending tube is greater than the radial depth of the slits in the slit group closer to the proximal end of the bending tube.

[0007] In some embodiments, along the direction from the distal end to the proximal end of the bending tube, among the adjacent slits on the same circumferential side of the bending tube, the radial depth of one slit is greater than the radial depth of the adjacent other slit.

[0008] In some embodiments, the curved tube has a traction rope mounting portion combination that is distributed along the axial direction of the curved tube; the traction rope mounting portion combination includes traction rope mounting portions that are disposed opposite each other in the radial direction of the curved tube, and the traction rope mounting portions within the traction rope mounting portion combination are disposed adjacent to each other; adjacent traction rope mounting portion combinations are spaced apart in the axial direction of the curved tube, and a plurality of the gaps are distributed on the spaced path of the adjacent traction rope mounting portion combinations.

[0009] In some embodiments, in the axial direction of the curved tube, each of the traction rope mounting portions is correspondingly disposed with one of the gaps on the radially opposite side.

[0010] In some embodiments, the curved tube has a plurality of axially connected bending units, and adjacent bending units are connected by a joint portion, and the traction rope mounting portions are correspondingly disposed at the adjacent joint portions.

[0011] In some embodiments, the distribution path of the gaps is opposite to the extension path of the traction rope.

[0012] In some embodiments, the distribution path of the gaps and the extension path of the traction rope are staggeredly distributed in the axial direction of the curved tube.

[0013] In a second aspect, the present application provides a passive bending section, including the curved tube described in the first aspect of the present application.

[0014] In some embodiments, the passive bending section further includes a main hose connected to the proximal end of the curved tube, and the stiffness of the main hose is greater than the stiffness of the proximal end of the curved tube.

[0015] In some embodiments, the proximal end of the curved tube has a plug-in portion, the plug-in portion is provided with a joint seam, the distal end of the main hose has a docking section, and the docking section is in interference fit with the portion of the plug-in portion provided with the joint seam; one end of the joint seam away from the docking section and the end of the gap are staggeredly distributed in the axial direction of the passive bending section.

[0016] In a third aspect, the present application provides an insertion portion, including the passive bending section described in the second aspect of the present application.

[0017] In a fourth aspect, the present application provides an endoscope, including the insertion portion described in the third aspect of the present application.

[0018] The present application has the following advantages and beneficial effects:

[0019] In the bending tube disclosed in the embodiments of the present application, the gap existing in the bending tube can improve the bending performance of the bending tube, so that during the operation of the endoscope by the operator, the bending tube and the passive bending section can be effectively driven by manipulating the traction rope to follow the active bending section for follow-up bending and adaptively cooperate with the actions of the active bending section.

[0020] At the same time, since the radial depth of the gap gradually decreases along the direction from the distal end to the proximal end of the bending tube, it indicates that the stiffness of a part of the bending tube near the proximal end is greater than that of a part of the bending tube near the distal end. Then, there is a gradual change effect in the stiffness of the passive bending section, and the coaxiality of the bending tube near the operation handle side will be better. When the operator needs to rotate the insertion part, the expected bending action can be effectively achieved.

[0021] Compared with the related art, based on the gradual change setting of the gap, the bending tube of the embodiments of the present application can take into account both the bending performance of the bending tube and the situation that the operator avoids being unable to achieve the expected bending action due to poor coaxiality during circumferential rotation. Furthermore, on the premise that the bending tube has bending performance, it is beneficial to improve the operability of the insertion part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 is a schematic diagram of the connection structure between the bending tube and the active bending section of the embodiment of the present application;

[0024] Figure 2 is a partial schematic view of the connection between the bending tube and the active bending section of the embodiment of the present application Figure 1 ;

[0025] Figure 3 is a partial schematic view of the connection between the bending tube and the active bending section of the embodiment of the present application Figure 2 ;

[0026] Figure 4 is a partial schematic view of the bending tube of the embodiment of the present application Figure 1 ;

[0027] Figure 5 is a partial schematic view of the bending tube of the embodiment of the present application Figure 2 ;

[0028] Figure 6 is a partial schematic view of the bending tube of the embodiment of the present application Figure 3;

[0029] Figure 7 is an exploded view of the passive bending section of the embodiment of the present application;

[0030] Figure 8 is a structural view of the passive bending section of the embodiment of the present application;

[0031] Figure 9 is a partial exploded view of the connection between the insertion part and the main hose of the embodiment of the present application;

[0032] Figure 10 is a partial schematic view of the connection between the insertion part and the main hose of the embodiment of the present application Figure 1 ;

[0033] Figure 11 is a partial schematic view of the connection between the insertion part and the main hose of the embodiment of the present application Figure 2 ;

[0034] Figure 12 is an exploded structural view of the insertion part of the embodiment of the present application;

[0035] Figure 13 is a structural view of the endoscope of the embodiment of the present application.

[0036] In the figure, the markings are:

[0037] 100, bending tube; 110, insertion part; 1110, joint seam;

[0038] 200, gap group; 210, gap;

[0039] 300, traction rope installation part combination; 310, traction rope installation part;

[0040] 400, bending unit; 410, joint part;

[0041] 500, main hose; 510, docking section;

[0042] 600, active bending section;

[0043] 700, insertion part. Detailed implementation manners

[0044] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope protected by the present application.

[0045] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0046] In the related art, since the insertion part needs to consider the bending performance, the active bending section and the passive bending section have different bending degrees. And the active bending section needs to have good bending ability to achieve the purpose of manipulation. Therefore, generally, the active bending section is made by the way of hinging multiple snake bone units. However, the passive bending section has relatively low requirements for bending performance. In most cases, the passive bending section mainly follows the active bending section to help the endoscope smoothly pass through complex human body cavities. Therefore, generally, the surface of the passive bending section is provided with gaps to achieve the bending of the passive bending section.

[0047] After research, the applicant found that, generally, the passive bending section also has requirements for the radial depth of the gap. If the radial depth is too small, the bending performance of the passive bending section is relatively poor, and the purpose of following the active bending section cannot be achieved.

[0048] If the radial depth is too large, the bending performance of the passive bending section is too good, which will cause the stiffness of the passive bending section to become smaller and the coaxiality to become worse. At this time, during the specific operation of the insertion part, since the bending direction of the active bending section is only limited to two opposite directions, in some surgical scenarios, the bending range of the active bending section cannot meet the needs of the operator during the operation. When the insertion part cannot observe the lesion or observes the lesion unclearly after being inserted into the human body cavity, at this time, it is necessary to rotate the insertion part to meet the need of adjusting the observation orientation. Due to the poor coaxiality of the passive bending section, the passive bending section is prone to self-twist, so it is difficult for the operator to manipulate the insertion part to achieve the expected bending action in the human body cavity, which is not conducive to the operator's manipulation of the insertion part.

[0049] In view of this, in a first aspect, some embodiments of this application provide a bending tube. Among them, the bending tube is applied to the passive bending section of the endoscope, and the distal end of the bending tube is used to connect the active bending section of the endoscope. Of course, it is not limited to the field of endoscope technology.

[0050] Please refer to Figures 1 to 13, in some embodiments, the curved tube 100 includes slits 210 that penetrate into the interior of the curved tube 100. The slits 210 are provided at least in a portion of the curved tube 100 near its distal end, and multiple slits 210 are arranged along the axial direction of the curved tube 100. After the curved tube 100 has the slits 210, the bending performance of the curved tube 100 itself is improved, so that the requirement of following the active bending section 600 can be met. Exemplarily, in order to improve the processing efficiency of the slits 210, the slits 210 can be formed by cutting. At the same time, the multiple slits 210 formed by cutting can be relatively more regular.

[0051] Meanwhile, along the direction from the distal end to the proximal end of the curved tube 100, the radial depth of each slit 210 gradually decreases. Exemplarily, the radial depth of the slit 210 can be in the radial direction of the curved tube 100, or it can be the dimensional component of the depth of the slit 210 in the radial direction, that is, the slit 210 can also be recognized as the radial depth of the slit 210 when it is slightly deviated from the radial direction. In the gradual decrease of the radial depth of the slit 210, "gradually" can have at least two meanings. Exemplarily, the first meaning refers to the radial depth of the slit 210 decreasing according to a gradient, and the radial depths of the slits 210 in the same gradient can be the same; the second meaning refers to the radial depth of the slit 210 decreasing in sequence according to the arrangement order of the slits 210. Other meanings of "gradually" will not be elaborated in this application.

[0052] On this basis, the stiffness of a part of the curved tube 100 near the proximal end is greater than that of a part of the curved tube 100 near the distal end. Then, the proximal end of the passive bending section has a greater stiffness, so that during the process of the passive bending section being rotated by the operator, the deformation amplitude of the proximal end of the passive bending section will be smaller, that is, the coaxiality is better. Thus, it is more conducive to driving the distal end by the proximal end of the passive bending section to realize the circumferential rotation of the whole passive bending section, so as to rotate the insertion part to the expected circumferential position. Thus, the operator can control the insertion part to perform a bending action at this position to achieve the expected bending effect.

[0053] For example, after the operator operates the insertion part to enter the human body cavity and finds that neither the current position of the insertion part nor its position after adjusting the bending angle can well observe the lesion, then it is necessary to adjust the circumferential position of the insertion part to change the bending direction of the insertion part. At this time, if the insertion part is in a straight human body cavity, the insertion part can be directly rotated, and if the insertion part is in a tortuous human body cavity, the insertion part needs to be adjusted to a straight human body cavity for rotation. During rotation, the proximal end of the passive bending section has a greater stiffness and its deformation amplitude will be smaller, so that the operator can effectively rotate the passive bending section and adjust the insertion part to the expected circumferential orientation. At this time, the operator can better observe the lesion after adjusting the circumferential position of the insertion part.

[0054] In summary, when the operator needs to rotate the insertion portion 700, the expected bending action can be effectively achieved, so as to improve the operability of the insertion portion 700 on the premise that the bending tube 100 has bending performance.

[0055] In some embodiments, in combination with Figure 2 , a plurality of slits 210 include a plurality of slit groups 200 distributed along the axial direction of the bending tube 100. Among them, the radial depth of the slits 210 in the slit group 200 closer to the distal end of the bending tube 100 is greater than the radial depth of the slits 210 in the slit group 200 closer to the proximal end of the bending tube 100. Exemplarily, in the same slit group 200, the radial depths of the respective slits 210 are the same. The advantage of such a setting is that in the bending tube 100, the stiffness of the pipe section provided with the slit group 200 can be kept consistent, so that the structural stability of the bending tube 100 is higher, and when the operator manipulates the insertion portion 700 to rotate, the bending tube 100 is not easily damaged. Moreover, when processing the slits 210 in the same slit group 200, the radial depth can be adjusted once to process each of the slits 210 in the same slit group 200, effectively improving the processing efficiency of the slits 210.

[0056] In some embodiments, along the direction from the distal end to the proximal end of the bending tube 100, among the adjacent slits 210 located on the same circumferential side of the bending tube 100, the radial depth of one slit 210 is greater than the radial depth of the adjacent other slit 210. Such a setting indicates that the radial depth of the slits 210 decreases sequentially from the distal end to the proximal end according to the arrangement order of the slits 210, so that the coaxiality change of the bending tube 100 from the distal end to the proximal end is smoother and more reliable.

[0057] In some embodiments, such as Figure 3 , Figure 4 , the bending tube 100 has a traction rope mounting portion combination 300, and the traction rope mounting portion combination 300 is distributed along the axial direction of the bending tube 100. Exemplarily, the adjacent traction rope mounting portion combinations 300 are spaced apart in the axial direction of the bending tube 100, and a plurality of slits 210 are distributed on the interval path between the adjacent traction rope mounting portion combinations 300. Such a setting makes the adjacent traction rope mounting portion combinations 300 on the bending tube 100 have a certain distance, and the number of the traction rope mounting portion combinations 300 on the bending tube 100 can also be set relatively less, which is beneficial to improving the structural stability of the bending tube 100 and avoiding the structural stability of the bending tube 100 from decreasing due to too many traction rope mounting portion combinations 300.

[0058] Exemplarily, in combination with Figure 5, the traction rope mounting portion assembly 300 includes traction rope mounting portions 310 disposed radially opposite to each other on the bending pipe 100. The traction rope mounting portions 310 are used for inserting the traction ropes. With the traction rope mounting portions 310 provided at radially opposite positions, two traction ropes can be respectively inserted into the opposite positions, so as to achieve the purpose of bending the active bending section 600 in two opposite directions. Exemplarily, the traction rope mounting portion 310 is an arc-shaped insertion structure formed by stamping the pipe wall of the bending pipe 100 into the interior of the bending pipe 100, which can more conveniently insert the traction rope along the axial direction of the bending pipe 100 and improve the installation efficiency. Of course, the traction rope mounting portion 310 can also be in other structural forms, such as an arc-shaped insertion structure formed by stamping the pipe wall of the bending pipe 100 outward.

[0059] In some embodiments, the traction rope mounting portions 310 within the traction rope mounting portion assembly 300 are disposed adjacent to each other. Exemplarily, there are two traction rope mounting portions 310 within the traction rope mounting portion assembly 300, and the two traction rope mounting portions 310 are radially opposite and close to each other. With such a setting, during the pulling process of the traction rope, the bending degrees of the portions of the bending pipe 100 provided with the opposite traction rope mounting portions 310 can be kept similar. Of course, there can also be other numbers of traction rope mounting portions 310 within a traction rope mounting portion assembly 300, such as three, four, or five, etc.

[0060] In some embodiments, in the axial direction of the bending pipe 100, the traction rope mounting portions 310 are respectively arranged corresponding to a gap 210 on the radially opposite side. With such a setting, the distribution positions of the traction rope mounting portions 310 and the gaps 210 can be made more reasonable. Since the cross-section of the bending pipe 100 is circular, the opening of the gap 210 will occupy the cross-sectional size of the bending pipe 100. In the circumferential direction of the bending pipe 100, the portion directly opposite the gap 210 is not occupied by the gap 210, so it can be used to arrange the traction rope mounting portions 310.

[0061] In some embodiments, as Figure 6 shown, the bending pipe 100 has a plurality of axially connected bending units 400, and adjacent bending units 400 are connected by a joint portion 410. The traction rope mounting portions 310 are correspondingly arranged at adjacent joint portions 410. On this basis, the traction rope mounting portions 310 are arranged on the adjacent joint portions 410, so that the distribution of the traction rope mounting portions 310 is closer. When the bending pipe 100 is bent in two opposite directions, the bending performance can be further kept similar.

[0062] In some embodiments, the distribution path of the gap 210 is opposite to the extension path of the traction rope. In this way, when the operator controls the traction rope to pull the active bending section 600, the bending tube 100 will bend following the active bending section 600. When bending, the force distribution path of the bending tube 100 is opposite to the distribution path of the gap 210, so that the bending tube 100 can bend more easily under the action of the gap 210.

[0063] Exemplarily, the distribution path of the gap 210 and the extension path of the traction rope are staggered in the axial direction of the bending tube 100. With this arrangement, when the operator manipulates the traction rope to pull the active bending section 600, the bending tube 100 will bend following the active bending section 600. When bending, the force distribution path of the bending tube 100 and the distribution path of the gap 210 are staggered, which can avoid damage to the gap 210 due to excessive force to a certain extent, and also allow the bending tube 100 to achieve normal bending.

[0064] See also Figures 1 to 13 In the second aspect, some embodiments of the present application further provide a passive bending section, which includes the bending tube 100 mentioned in any of the above schemes. Thus, the passive bending section of the embodiment of the present application has the beneficial effects of the above bending tube 100, which will not be described in detail here.

[0065] Exemplary, combined Figure 7 , Figure 8 The passive bending section also includes a main hose 500 connected to the proximal end of the bending tube 100, and the rigidity of the main hose 500 is greater than the rigidity of the proximal end of the bending tube 100. Exemplarily, the end of the main hose 500 away from the bending tube 100 is connected to the operating handle of the endoscope, so that when the operator pulls the pulling rope through the operating handle, the bending tube 100 can follow the movement of the active bending section 600, and the main hose 500 has a relatively large rigidity, so that the bending amplitude of the main hose 500 is not large, so that the main hose 500 close to the operating handle is more operable.

[0066] In some embodiments, in order to improve the bending degree of the insertion part 700, multiple slits 210 can also be arranged along the axis of the main hose 500, so that the insertion part 700 can adapt to a more tortuous human cavity. Of course, the arrangement of the slits 210 on the main hose 500 can also be arranged according to the arrangement of the slits 210 on the bending tube 100, and their functions are the same, so they will not be repeated here.

[0067] Exemplary, combined Figure 9 , Figure 10, the proximal end of the curved tube 100 has a plug-in portion 110, the plug-in portion 110 is provided with a joint seam 1110, the distal end of the main hose 500 has a docking section 510, and the docking section 510 is in interference fit with the portion of the plug-in portion 110 provided with the joint seam 1110. Exemplarily, the outer diameter of the docking section 510 is greater than or equal to the inner diameter of the plug-in portion 110.

[0068] On this basis, when connecting the curved tube 100 and the main hose 500, the docking section 510 can be directly inserted into the inner cavity of the plug-in portion 110. Since the plug-in portion 110 is provided with a joint seam 1110, the stiffness of the portion of the plug-in portion 110 with the joint seam 1110 is relatively small. During the insertion of the docking section 510, the outer wall of the docking section 510 can directly push the portion of the plug-in portion 110 with the joint seam 1110 to avoid in the direction away from the docking section 510, so that the docking section 510 can smoothly enter the inner cavity of the plug-in portion 110, and finally the docking portion and the docking section 510 achieve an interference fit. And, after the docking section 510 is inserted into the plug-in portion 110 in place, the inserted portion of the docking section 510 can also act on the portion of the plug-in portion 110 with the joint seam 1110 to increase the stiffness of the portion of the plug-in portion 110 with the joint seam 1110. Thus, when the operator manipulates the insertion portion 700 to rotate, due to the increased stiffness at the connection between the two, the coaxiality at the connection between the plug-in portion 110 and the docking section 510 is further improved, and the connection between the plug-in portion 110 and the docking section 510 can smoothly rotate synchronously.

[0069] In some embodiments, as Figure 11 shown, the end of the joint seam 1110 away from the docking section 510 is axially misaligned with the end of the gap 210 in the passive bending section. Since the end of the joint seam 1110 and the end of the gap 210 are both stress-bearing areas, the purpose of such a setting is to avoid the stress-bearing area around the end of the joint seam 1110 from the stress-bearing area around the end of the gap 210, which is beneficial to improving the anti-damage performance and stiffness of the curved tube 100 after the joint seam 1110 is provided, so that the curved tube 100 can maintain good coaxiality when the insertion portion 700 rotates.

[0070] Please refer to Figures 1 to 13 , Thirdly, some embodiments of the present application further provide an insertion portion 700, which includes the passive bending section mentioned in any of the foregoing solutions.

[0071] Please refer to Figures 1 to 13 , Fourthly, some embodiments of the present application further provide an endoscope, which includes the insertion portion 700 mentioned in any of the foregoing solutions.

[0072] In the embodiments of the present application, the endoscopes involved may be bronchoscopes, pyeloscopes, esophagoscopes, gastroscopes, colonoscopes, otoscopes, nasal endoscopes, oral endoscopes, laryngoscopes, vaginoscopes, laparoscopes, arthroscopes, etc. The embodiments of the present application do not specifically limit the types of endoscopes.

[0073] The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application.

Claims

1. A bending tube for a passive bending section of an endoscope, characterized in that: The distal end of the bending tube (100) is used to connect to the active bending section (600) of the endoscope, the bending tube (100) comprises a slit (210), the slit (210) penetrates the interior of the bending tube (100), the slit (210) is at least arranged at a portion of the bending tube (100) close to the distal end thereof, and a plurality of slits (210) are arranged along the axial direction of the bending tube (100); Along the direction from the distal end to the proximal end of the curved tube (100), the radial depth of each of the slits (210) gradually decreases.

2. The bending tube according to claim 1, characterized in that The plurality of slits (210) include a plurality of slit groups (200) distributed along the axial direction of the curved tube (100), wherein the radial depth of the slits (210) in the slit group (200) closer to the distal end of the curved tube (100) is greater than the radial depth of the slits (210) in the slit group (200) closer to the proximal end of the curved tube (100); Alternatively, along the direction from the distal end to the proximal end of the curved tube (100), of the adjacent slits (210) located on the same circumferential side of the curved tube (100), the radial depth of one of the slits (210) is greater than the radial depth of another adjacent slit (210).

3. The bending tube according to claim 2, characterized in that: The curved tube (100) has a traction rope installation part assembly (300), and the traction rope installation part assembly (300) is distributed along the axial direction of the curved tube (100); The traction rope installation part assembly (300) comprises traction rope installation parts (310) arranged radially opposite to the curved tube (100), and the traction rope installation parts (310) in the traction rope installation part assembly (300) are arranged adjacent to each other; Adjacent traction rope installation part assemblies (300) are arranged at intervals in the axial direction of the curved tube (100), and a plurality of the slits (210) are distributed on the interval paths between adjacent traction rope installation part assemblies (300).

4. The bending tube according to claim 3, characterized in that In the axial direction of the bending tube (100), the traction rope mounting portion (310) is arranged corresponding to one of the slits (210) on the radially opposite side; And / or, the bending tube (100) has a plurality of axially connected bending units (400), adjacent bending units (400) are connected via a coupling portion (410), and the traction rope mounting portion (310) is correspondingly arranged at the adjacent coupling portion (410).

5. The bending tube according to claim 3, characterized in that: The distribution path of the slits (210) is directly opposite to the extension path of the traction rope; Alternatively, the distribution path of the slit (210) and the extension path of the traction rope are staggered in the axial direction of the curved tube (100).

6. A passive bending section, characterized in that: The invention comprises the bent tube (100) as claimed in any one of claims 1 to 5.

7. The passive bending section according to claim 6, characterized in that: The passive bending section further comprises a main hose (500) connected to the proximal end of the bending tube (100), and the rigidity of the main hose (500) is greater than the rigidity of the proximal end of the bending tube (100).

8. The passive bending section according to claim 7, characterized in that: The proximal end of the curved tube (100) has a plug-in portion (110), the plug-in portion (110) is provided with a joint seam (1110), and the distal end of the main hose (500) has a docking section (510), the docking section (510) is interference-fitted with the portion of the plug-in portion (110) provided with the joint seam (1110); An end of the joint seam (1110) away from the docking section (510) and an end of the gap (210) are staggeredly distributed in the axial direction of the passive bending section.

9. An insertion portion, characterized in that: Comprising the passive bending section according to any one of claims 7 or 8.

10. An endoscope, characterized in that: It comprises the insertion part (700) as claimed in claim 9.

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