Bending section of endoscope insertion section, endoscope insertion section, and endoscope

Abstract

The present invention discloses a bending part of an endoscope insertion part, which includes a strip-shaped body extending along a first direction. The outer contour of the cross-section of the body in the first direction is a 6-12-sided polygon. A plurality of through holes extending along the first direction and penetrating the body are provided in the body. A plurality of V-shaped grooves arranged along the first direction and opening towards a second direction are provided on the body, and the second direction is perpendicular to the first direction. An endoscope insertion part and an endoscope are also disclosed, which have a simple structure and can be manufactured at low cost.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to a bending part of an endoscope insertion part, an endoscope insertion part, and an endoscope. Background Art

[0002] An endoscope is a common medical device, which is composed of an operating part and an insertion part. The insertion part is arranged at the distal end of the operating part and is used to enter the human body through the natural orifice of the human body or through an incision formed by surgery. The insertion part successively includes a front end part and a bending part from far to near, and an observation mirror is arranged on the front end part. The bending part can be bent according to the control of the operating part, so as to change the observation direction of the observation mirror or change the direction in which the surgical instrument extends from the surgical instrument channel or the so-called working channel.

[0003] Currently, the bending part generally adopts a split snake bone structure, that is, a plurality of pipe joints are connected in sequence and can rotate relative to each other at a certain angle. By passing a traction wire through each pipe joint, the bending of the bending part is controlled so that doctors can observe relevant parts. This structure is often too complex and has a high production cost.

[0004] Therefore, a monolithic or integral bending part has emerged.

[0005] Chinese Patent CN109963491A discloses a device and method for internal imaging. The device includes a handpiece and a connecting pipe extending from the proximal end of the handpiece. It is disclosed on page 7 of its specification that the connecting pipe may include a monolithic flexible or deformable support structure. The monolithic support structure has a series of offset annular segments of a first set of segments and a second set of segments offset approximately 90 degrees from the first set of segments. The first set of segments and the second set of segments are connected by paired flexure bridges, and the flexure bridges generally allow flexure in at least one direction, so that the support structure can be manipulated in two-dimensional directions by pulling and / or pushing appropriate pull wires to achieve the bending of the connecting pipe.

[0006] Chinese Patent CN205197941U discloses an endoscope bending part and a disposable endoscope, including a snake bone body; wherein the snake bone body includes a first side surface and a second side surface; the first side surface and the second side surface are opposite to each other, and a plurality of first grooves arranged in sequence along the axial direction are provided on both the first side surface and the second side surface. The snake bone body is internally provided with a plurality of first through holes and traction holes axially penetrating the snake bone body, as well as a first axial rigid support member and a first support member mounting hole. The first support member mounting hole axially penetrates the inside of the snake bone body, and the first axial rigid support member is arranged in the first support member mounting hole to prevent the snake bone body from deforming in the axial direction and facilitate use.

[0007] However, among the existing components for implementing the bending function, either the structure is complex and the production cost is high, or in actual use, it is found that there is always a certain deviation from the expected bending orientation. Summary of the Invention

[0008] The present invention provides a bending part of an endoscope insertion part, an endoscope insertion part and an endoscope, which can effectively control the bending orientation of the bending part at low cost.

[0009] The inventor found that in the prior art, the reason why the bending part deviates from the expected bending orientation in the working state is that the cross-section of the bending part body often adopts a circular or annular shape. In actual use, under the traction of the traction wire, the bending part bends, and actually there is also a rotation in the circumferential direction during bending, which is also called twisting or torsion, and this affects the bending part to reach the expected bending orientation. The split snake bone structure has less twisting phenomenon because the rotation angle between the pipe joints is restricted, but the split snake bone structure is complex and the production cost is high; the integral snake bone structure usually has the above-mentioned problem of inaccurate bending orientation significantly.

[0010] To solve the above technical problems, an embodiment of the present invention discloses a bending part of an endoscope insertion part, including a strip-shaped body extending along a first direction. The outer contour of the cross-section of the body in the first direction is a 6-12-sided polygon. A plurality of through holes extending along the first direction and passing through the body are provided in the body. A plurality of V-shaped grooves arranged along the first direction and opening towards a second direction are provided on the body, and the second direction is perpendicular to the first direction.

[0011] By adopting the above technical solution, through the setting that the outer contour of the cross-section of the body in the first direction is a 6-12-sided polygon, when the bending part of the endoscope insertion part provided by the present invention is controlled to bend, it is not easy to twist; through the setting of the V-shaped grooves, compared with other shapes, the beneficial effect of not being easy to twist is further strengthened.

[0012] Optionally, a plurality of V-shaped grooves arranged along the first direction and opening towards a third direction are provided on the body, and the third direction is perpendicular to both the second direction and the first direction at the same time.

[0013] Optionally, a plurality of V-shaped grooves arranged along the first direction and opening towards the opposite direction of the second direction and / or the opposite direction of the third direction are provided on the body.

[0014] Optionally, a V-shaped groove opening towards the second direction and a V-shaped groove opening towards the opposite direction of the second direction are arranged oppositely to form a first V-shaped groove group; a V-shaped groove opening towards the third direction and a V-shaped groove opening towards the opposite direction of the third direction are arranged oppositely to form a second V-shaped groove group.

[0015] Optionally, the distance between two V-grooves with opposite opening directions in the first V-groove group, and / or the distance between two V-grooves with opposite opening directions in the second V-groove group, is 0.3 - 0.9 millimeters.

[0016] Optionally, the first V-groove group and the second V-groove group are arranged at intervals along the first direction.

[0017] Optionally, the maximum opening angle degree of the V-groove is 3.75 times the diameter in millimeters of the circumscribed circle of the cross-section of the body.

[0018] Optionally, the through-hole includes a working channel through-hole, an auxiliary channel through-hole, and a wire harness channel through-hole.

[0019] Optionally, the wire harness channel through-hole provides a path for the towing wire, optical fiber, and electric wire; the working channel through-hole provides a path for the working channel pipeline.

[0020] Optionally, the auxiliary channel through-hole provides a path for the water pipe or air pipe.

[0021] Optionally, the bending part of the endoscope insertion part is integrally injection-molded.

[0022] Optionally, the material of the bending part of the endoscope insertion part is one of silicone rubber, TPE, TPU, PVC, and PP.

[0023] Optionally, from the proximal end to the distal end of the bending part, the opening angle of the V-groove increases in sequence.

[0024] Optionally, the minimum opening angle of the V-groove is 10 degrees.

[0025] The present invention also provides an endoscope insertion part, including the bending part of the endoscope insertion part described above.

[0026] Optionally, it further includes: a protective sleeve for sleeving outside the bending part; a working channel pipeline placed in the working channel through-hole, and the material of the working channel pipeline is one of PVC, TPE, PTFE, and TPU; a water pipe or air pipe placed in the auxiliary channel through-hole, and the material of the water pipe or the air pipe is one of PVC, TPE, PTFE, and TPU.

[0027] The present invention also provides an endoscope, including the above endoscope insertion part. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A perspective view showing the structure of the bending part of the endoscope insertion part provided by an embodiment of the present invention.

[0029] Figure 2 A front view showing the structure of the bending part of the endoscope insertion part provided by an embodiment of the present invention.

[0030] Figure 3 The top view showing the bending part structure provided by an embodiment of the present invention.

[0031] Figure 4 Showing along Figure 2 The cross-sectional view taken along A-A in

[0032] Figure 5 The left view showing the bending part structure provided by an embodiment of the present invention.

[0033] Figure 6 The schematic diagram of the force on the side wall edge of the notch or groove when the bending part of the prior art is bent.

[0034] Figure 7 The schematic diagram of the force on the side wall edge of the V-shaped groove when the bending part provided by an embodiment of the present invention is bent. Detailed implementation manners

[0035] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiments, this does not mean that the features of this invention are limited to this implementation manner. On the contrary, the purpose of introducing the invention in conjunction with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, many specific details will be included in the following description. The present invention can also be implemented without these details. In addition, in order to avoid confusing or obscuring the key points of the present invention, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0036] It should be noted that in this specification, similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by terms such as "upper" is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0038] In the description of this embodiment, it should be noted that the terms "proximal" and "distal" are relative positional relationships. When an operator operates an instrument to process a target object, along this instrument, the side closer to the operator is "proximal", and the side closer to the target object is "distal".

[0039] The terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0040] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific situations.

[0041] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] An electronic endoscope is a medical electronic optical instrument integrating technologies such as optics, mechanics, and electronics that can be inserted into the body cavities and internal organs of the human body for direct observation, diagnosis, and treatment. It uses an extremely small electronic imaging element to image the object in the cavity to be observed through a tiny objective optical system, then sends the received image signal to an image processing system, and finally outputs the processed image on a display for doctors to observe and diagnose. Electronic endoscopes are divided into electronic gastroscopes, electronic duodenoscopes, electronic colonoscopes, etc.

[0043] The electronic endoscope includes an operation part and a slender insertion part located on the distal side of the operation part. The operator operates the operation part to bend the bending part located at the distal end of the insertion part in different directions. The observation optical system located on the distal end face of the insertion part obtains an image of the desired observation site, and the operator can accordingly perform observation, diagnosis, shooting, treatment, etc. That is to say, when used as the bending part of the endoscope insertion part, the distal end of the bending part is provided with an observation optical system, and the proximal end is connected to other parts of the insertion part and is bent under the control of the operation part.

[0044] Figure 1 A perspective view showing the structure of the bending part of the endoscope insertion part provided by an embodiment of the present invention. As Figure 1 shown, the present invention provides a bending part 1 of an endoscope insertion part, including a strip-shaped body extending along the first direction X. The outer contour of the cross-section of the body in the first direction X is a 6-12-sided polygon (as an example, Figures 1 to 5As shown (it is a 12-sided polygon), the body is provided with a plurality of through holes extending along the first direction X and penetrating the body, and the body is provided with a plurality of V-shaped grooves 111a arranged along the first direction X and opening towards the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0045] The cross-section of the bending part of the existing endoscope insertion tube is generally designed to be circular or annular, that is, it presents as a cylinder in the relaxed state (not being pulled by the traction wire). When the insertion part enters the human body cavity or other positions to be observed, the bending part is bent by the traction wire. At this time, it often rotates in the circumferential direction while bending, that is, twists or torsions, which affects the bending part to reach the desired bending orientation and causes the observation angle to deviate. The reason is as Figure 6 shown, when the bending part of the existing technology, which is roughly cylindrical, bends, the two relatively arranged surfaces of the fan-shaped incision (as called in CN109963491A) or the groove (as called in CN205197941U) are in contact. At this time, the edges of the two mutually contacting surfaces are circular, which means that the forces on the edges of the relatively arranged surfaces are basically the same; in addition, in order to make the bending part easy to bend and be able to restore its initial shape when no longer being pulled by the traction wire, the bending part often uses an elastic material. This leads to the bending part provided by the existing technology being prone to rotate in the circumferential direction when bending, that is, twist. By adopting the above technical solution of the present invention, through the setting that the outer contour of the cross-section of the body in the first direction is a 6-12-sided polygon, when the bending part of the insertion part of the endoscope provided by the present invention bends towards the second direction, as Figure 7 shown, the edges of the relatively arranged side walls of the V-shaped groove are straight edges in a broken line form. When the relatively arranged side walls of the V-shaped groove provided by the embodiment of the present invention fit together with the bending of the bending part, the forces on the side wall edges are not uniform in the circumferential direction, that is, the force at the fold angle is different from that at the straight edge. In this way, it can prevent the bending part from rotating in the circumferential direction to a certain extent when bending. However, if the outer contour of the cross-section of the body in the first direction is set as a polygon with the number of sides less than 6, it will affect the bending flexibility of the bending part and reduce the number and size of the through holes that the body can accommodate; and the anti-twisting performance will also weaken with the increase in the number of sides. Therefore, after repeated tests, it is appropriate to set the number of sides of the polygon between 6 and 12.

[0046] Moreover, the V-shaped setting of the V-shaped groove, that is, the bottom of the groove is linear. In this way, when the bending part bends and the relatively arranged side walls of the groove fit together, the area where the two side walls fit together is larger. Such a setting is also helpful for the anti-twisting effect compared with the U-shaped groove or the setting where the bottom is not linear in the existing technology.

[0047] In addition, since the bending portion is part of the insertion portion, and the insertion portion needs to be inserted into the human body or a narrow environment, a protective sleeve is often required to be provided on the outer side of the bending portion. Setting the outer contour of the bending portion body as a polygon is also beneficial for inserting the protective sleeve along the axial direction of the bending portion compared to the circular shape in the prior art. Those skilled in the art can understand that this is because the contact area between the outer side of the bending portion and the inner side of the protective sleeve is reduced; there are gaps between the straight sides of the polygon and the inner wall of the generally circular protective sleeve, which is also beneficial for inserting the protective sleeve along the axial direction of the bending portion. The above effects are particularly obvious when both the protective sleeve and the bending portion are made of elastic materials. Most importantly, the above technical solution has a simple structure and can be manufactured at low cost.

[0048] Figure 2 The front view showing the structure of the bending portion of the insertion portion of the endoscope provided by an embodiment of the present invention. Figure 3 The top view showing the structure of the bending portion provided by an embodiment of the present invention. Figure 4 Showing along Figure 2 The cross-sectional view taken along A-A in Figure 5 The left view showing the structure of the bending portion provided by an embodiment of the present invention. As Figures 1 to 5 shown, a plurality of V-shaped grooves 112a arranged along the first direction X and opening towards the third direction Z are provided on the body, and the third direction Z is perpendicular to the second direction Y and the first direction X at the same time. A plurality of V-shaped grooves 111b arranged along the first direction X and opening towards the opposite direction Y' of the second direction Y, and / or V-shaped grooves 112b opening towards the opposite direction Z' of the third direction Z are also provided on the body.

[0049] Continuing to refer to Figures 1 to 5 , a V-shaped groove 111a opening towards the second direction Y and a V-shaped groove 111b opening towards the opposite direction Y' of the second direction Y are oppositely arranged to form a first V-shaped groove group 111; a V-shaped groove 112a opening towards the third direction Z and a V-shaped groove 112b opening towards the opposite direction Z' of the third direction Z are oppositely arranged to form a second V-shaped groove group 112. The opposite arrangement means that the V-shaped groove 111a and the V-shaped groove 111b are in the same position in the first direction X. In other words, the distances from the V-shaped groove 111a and the V-shaped groove 111b to one end or the other end of the bending portion are the same, so that during the bending process of the bending portion, when one of the V-shaped grooves in the V-shaped groove 111a and the V-shaped groove 111b is closed, the other V-shaped groove is further opened, which is beneficial to ensuring the stability of the bending portion during the bending process.

[0050] Continuing to refer to Figure 1 , the first V-shaped groove group 111 and the second V-shaped groove group 112 are arranged at intervals along the first direction X, which is beneficial to ensuring the normal bending and structural stability of the bending portion when bending along the second direction Y, the opposite direction Y' of the second direction, the third direction Z or the opposite direction Z' of the third direction. In another embodiment of the present invention, asFigure 2 or Figure 3 As shown, the distance d between two V-grooves with opposite opening directions in the first V-groove group 111 and / or the second V-groove group 112 is 0.3 - 0.9 mm to ensure the number of bending times of the bending part.

[0051] The diameter of the circumscribed circle of the cross-section of the main body of the bending part 1 is approximately 12 mm. Refer to Figure 2 , in the embodiment of the present invention, the maximum opening angle of the V-groove is 45 degrees. Through experimental comparison, it is found that based on the structures and materials of the components in the embodiment provided by the present invention, a larger opening angle is not conducive to the accurate control of the bending angle and also has an adverse effect on the anti-twisting performance; the minimum opening angle of the V-groove is 10 degrees. Based on the cooperation of the structures and materials of the components in the embodiment provided by the present invention, a smaller opening angle is difficult to provide the required degree of bending, that is, the angle at which the bending part is controlled to bend in the axial direction. Those skilled in the art can understand that the above-mentioned opening angle of the V-groove is directly related to the diameter of the circumscribed circle of the cross-section of the main body of the bending part 1, and the cooperation relationship between the two directly affects the bending performance and anti-twisting performance of the bending part 1. According to the experiment, to ensure the above-mentioned performance, the opening angle of the V-groove and the diameter of the circumscribed circle of the cross-section of the main body of the bending part 1 are approximately linearly related, that is, the numerical value of the maximum opening angle of the V-groove is 3.75 times the numerical value of the diameter of the circumscribed circle of the cross-section of the main body of the bending part 1.

[0052] As Figure 2 shown, the maximum opening angles α1, α2, α3 of the V-groove are 45 degrees at most and 10 degrees at least. Combining Figures 1 to 4 , in an embodiment of the present invention, from the proximal end 12 to the distal end 13 of the bending part 1, the opening angle of the V-groove gradually increases, that is, α1 < α2 < α3.

[0053] However, the above-mentioned maximum opening angle and minimum opening angle of the V-groove do not need to be satisfied simultaneously. In particular, the minimum opening angle can be adjusted as needed.

[0054] As Figure 5, the through holes may include a working channel through hole 14, an auxiliary channel through hole 15 or a wiring harness channel through hole 16. The wiring harness channel through hole 16 may include through holes 16a, 16b, and 16c, providing paths for the traction wire, optical fiber, and electric wire respectively. The function of the traction wire is to control the bending of the bending portion according to the operation of the operation portion. Specifically, one end of the traction wire is fixed to the operation portion, and the other end passes through the proximal end of the bending portion and is fixed to the distal end of the bending portion. By pulling and loosening the traction wire with the operation portion, the head end of the bending portion can be driven to pull and loosen, thereby realizing the bending control of the bending portion of the insertion portion; the optical fiber can transmit the light of an external light source to the required position to provide illumination for the process of inserting the endoscope into the human body cavity and observing; the electric wire can be a camera cable for transmitting electronic data or a cable for transmitting a relatively large current. The working channel through hole 14 provides a path for the working channel pipeline, and the material of the working channel pipeline can be one of PVC (Chinese name: polyvinyl chloride), TPE (Chinese name: thermoplastic elastomer), PTFE (Chinese name: polytetrafluoroethylene), and TPU (Chinese name: thermoplastic polyurethane elastomer). The auxiliary channel through hole 15 provides a path for the water pipe or air pipe, and the material of the water pipe or air pipe can be one of PVC (Chinese name: polyvinyl chloride), TPE (Chinese name: thermoplastic elastomer), PTFE (Chinese name: polytetrafluoroethylene), and TPU (Chinese name: thermoplastic polyurethane elastomer). The material of the water pipe or air pipe and the material of the working channel pipeline can have a cooperative effect with the material of the main body of the bending portion 1. By mutually adjusting the two materials, the required control force, bending angle, and bending stability can be further controlled. In the embodiment of the present invention, the material of the main body of the bending portion 1 can be one of silicone rubber, TPE (Chinese name: thermoplastic elastomer), TPU (Chinese name: thermoplastic polyurethane elastomer), PVC (Chinese name: polyvinyl chloride), and PP (Chinese name: polypropylene).

[0055] In the prior art, the bending portion of the insertion portion of the endoscope is of a split type, and multiple metal pipe joints are sequentially connected, or it is carved from a metal pipe. The assembly process is complex and the manufacturing cost is high. The bending portion of the insertion portion of the endoscope provided by the present invention is integrally injection-molded, reducing the assembly of parts and lowering the production cost.

[0056] The present invention also provides an endoscope insertion portion, including the bending portion of the endoscope insertion portion described in the above embodiment, and further including: a protective sleeve for sleeving outside the bending portion; a working channel pipeline placed in the working channel through hole, and the material of the working channel pipeline is one of PVC, TPE, PTFE, and TPU; a water pipe or air pipe placed in the auxiliary channel through hole, and the material of the water pipe or the air pipe is one of PVC, TPE, PTFE, and TPU.

[0057] The present invention also provides an endoscope, which includes the endoscope insertion part described above, and has a simple structure and can be manufactured at low cost.

[0058] Although the present invention has been illustrated and described by referring to some preferred embodiments of the present invention, those of ordinary skill in the art should understand that the above content is a further detailed description of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. Those skilled in the art can make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A bending section of an endoscope insertion section, comprising a strip-shaped body extending in a first direction, characterized in that, The outer contour of the cross-section of the body in the first direction is a 6- to 12-sided polygon. A plurality of through holes extending along the first direction and penetrating the body are provided in the body. A plurality of V-shaped grooves arranged along the first direction and opening towards the second direction are provided on the body, and the second direction is perpendicular to the first direction; A plurality of V-shaped grooves arranged along the first direction and opening towards the third direction are provided on the body, and the third direction is perpendicular to both the second direction and the first direction at the same time; A plurality of V-shaped grooves arranged along the first direction and opening towards the opposite direction of the second direction and / or the opposite direction of the third direction are provided on the body; A V-shaped groove facing the second direction and a V-shaped groove facing the opposite direction of the second direction are arranged opposite to each other to form a first V-shaped groove group; a V-shaped groove facing the third direction and a V-shaped groove facing the opposite direction of the third direction are arranged opposite to each other to form a second V-shaped groove group; The material of the bending part of the endoscope insertion part is one of silicone rubber, TPE, TPU, PVC, and PP.

2. The bending section of the endoscope insertion section according to claim 1, wherein The interval between two V-shaped grooves with opposite opening directions in the first V-shaped groove group is 0.3-0.9 mm; and / or, the interval between two V-shaped grooves with opposite opening directions in the second V-shaped groove group is 0.3-0.9 mm.

3. The bending portion of the endoscope insertion portion according to claim 2, characterized in that, The first V-shaped groove group and the second V-shaped groove group are arranged at intervals along the first direction.

4. The bending portion of the endoscope insertion portion according to any one of claims 1 to 3, characterized in that The maximum opening angle degree of the V-shaped groove is 3.75 times the diameter in millimeters of the circumscribed circle of the cross-section of the body.

5. The bending portion of the endoscope insertion portion according to claim 1, characterized in that, The through holes include a working channel through hole, an auxiliary channel through hole, and a wire harness channel through hole.

6. The bending portion of the endoscope insertion portion according to claim 5, wherein The wire harness channel through hole provides a path for the traction wire, optical fiber, and electric wire; the working channel through hole provides a path for the working channel pipeline.

7. The bending portion of the endoscope insertion portion according to claim 5, characterized in that, The auxiliary channel through hole provides a path for the water pipe or air pipe.

8. The bending portion of the endoscope insertion portion according to claim 1, characterized in that, The bending part of the endoscope insertion part is integrally injection molded.

9. The bending portion of the endoscope insertion portion according to claim 4, wherein From the proximal end to the distal end of the bending part, the opening angle of the V-shaped groove gradually increases.

10. The bending section of the endoscope insertion section according to claim 9, wherein The minimum opening angle of the V-shaped groove is 10 degrees.

11. An endoscope insertion portion, characterized in that, It includes the bending part of the endoscope insertion part according to any one of claims 1-10.

12. The endoscope insertion section according to claim 11, wherein, The through holes include a working channel through hole and an auxiliary channel through hole, and the endoscope insertion part further includes: A protective sleeve for sleeving outside the bending part; A working channel pipeline placed in the working channel through hole, and the material of the working channel pipeline is one of PVC, TPE, PTFE, and TPU; A water pipe or air pipe placed in the auxiliary channel through hole, and the material of the water pipe or the air pipe is one of PVC, TPE, PTFE, and TPU.

13. An endoscope, characterized in that, It includes the endoscope insertion part according to claim 11 or 12.

Images