Active bending section, insertion part and endoscope

Abstract

The utility model discloses an active bending section, an insertion part and an endoscope, and relates to the technical field of medical instruments. The active bending section comprises a first bending section and a second bending section, the first bending section comprises a plurality of snake joints, and every two adjacent snake joints are movably connected so as to achieve the bending action of the first bending section; the far end of the second bent section is connected with the near end of the first bent section, the second bent section is an injection molding pipe, and the bending resistance of the second bent section is larger than that of the first bent section. The active bending section and the first bending section at the far end are formed by movably connecting the multiple snake joints, the second bending section at the near end is an injection molding pipe, when the active bending section is bent, the active bending section can achieve the mode that the far end is bent first and then the near end is bent, the area swept by the far end in the bending process of the active bending section is reduced, and the bending efficiency is improved. When a doctor uses the device in an operation, the operation difficulty can be reduced, and tissue damage can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to an active bending section, an insertion part and an endoscope. Background Art

[0002] The insertion portion of the endoscope includes an active bending section and a passive bending section, with the active bending section located at the distal end of the insertion portion. In related art, a traction rope is provided within the handle, the distal end of which is fixedly connected to the snake-bone unit at the distal end of the active bending section, and the proximal end of which is fixedly connected to a dial or knob on the handle. By operating the dial or knob, the traction ropes can be moved synchronously in opposite directions, thereby bending the active bending section of the insertion portion. A camera module is provided at the distal end of the active bending section. By bending the active bending section, the direction of the camera module can be adjusted, allowing the camera module to be aimed at the lesion site to provide diagnostic information to the doctor.

[0003] However, the inventors discovered that when the active bending segment bends, its proximal end bends before the distal end. This bending method causes the distal end of the active bending segment to sweep a larger area during the bending process. When the doctor uses it during surgery, if it is necessary to bend the active bending segment to the infrarenal calyx end, the operation is more difficult. Utility Model Content

[0004] The utility model discloses an active bending section, an insertion portion and an endoscope, so as to solve the technical problem in the related art that when the active bending section of the endoscope is bent, its distal end sweeps a large area, making it difficult for doctors to operate during surgery.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] A first aspect of the present invention provides an active bending segment.

[0007] The active bending section of the utility model is used for an endoscope, and the active bending section includes a first bending section and a second bending section, wherein the first bending section includes a plurality of snake bone segments, and two adjacent snake bone segments are movably connected to realize the bending action of the first bending section; the distal end of the second bending section is connected to the proximal end of the first bending section, the second bending section is an injection molded tube, and the bending resistance of the second bending section is greater than the bending resistance of the first bending section.

[0008] According to an optional embodiment, the snake bone segment has a first through hole, which passes through the snake bone segment in the axial direction. The inner wall of the snake bone segment is also formed with at least two slots, which are evenly distributed along the circumferential direction of the snake bone segment.

[0009] According to an optional embodiment, the injection molding tube is a multi-lumen tube, and the injection molding tube has a first channel and at least two second channels, the first channel and the second channel both pass through the axial direction of the injection molding tube, and when the second curved section is connected to the first curved section, the first channel remains coaxial with the first through hole, and the second channel remains coaxial with the slot hole.

[0010] According to an optional embodiment, the active bending section further includes a connecting piece, the proximal end of the connecting piece is embedded in the distal end of the injection molded tube, and the distal end of the connecting piece is fixedly connected to the snake bone segment.

[0011] According to an optional embodiment, the thickness of the connecting piece is smaller than the thickness of the injection molded tube, and a step surface is formed between the distal end face of the injection molded tube and the connecting piece, and the step surface is located on the inner side or outer side of the second curved section. The step surface is used to position the snake bone segment and keep the wall surface of the snake bone segment flush with the wall surface of the injection molded tube.

[0012] According to an optional embodiment, the connecting member includes a plurality of connecting pieces, and the connecting pieces are evenly distributed in the circumferential direction of the distal end of the injection-molded tube; or the connecting member is a ring-shaped structure.

[0013] According to an optional embodiment, two adjacent serpentine segments are riveted together by a rivet, and the frictional resistance generated between the rivet and the serpentine segment gradually increases from the distal end to the proximal end.

[0014] According to an optional embodiment, the hardness of the injection-molded tube gradually increases from the distal end to the proximal end.

[0015] A second aspect of the present invention provides an insertion portion.

[0016] The insertion portion of the present invention comprises an active bending section and a passive bending section. The active bending section is the active bending section described in any technical solution of the present invention, and the proximal end of the active bending section is connected to the distal end of the passive bending section.

[0017] A third aspect of the present invention provides an endoscope.

[0018] The endoscope of the present invention comprises an insertion portion and a handle. The insertion portion is the insertion portion described in any one of the technical solutions of the present invention, and the proximal end of the insertion portion is connected to the handle.

[0019] The technical solution adopted by the utility model can achieve the following beneficial effects:

[0020] The active bending section of the present invention has a first bending section at the distal end formed by a movably connected plurality of serpentine segments, and a second bending section at the proximal end formed by an injection-molded tube. When the active bending section is controlled to bend by a traction rope, a gap is created between adjacent serpentine segments, providing greater flexibility and reducing the bending resistance of the first bending section. The second bending section at the proximal end is an injection-molded tube, and its integral structure increases the bending resistance of the second bending section. That is, when the active bending section of the present invention bends, the first bending section at the distal end can bend before the second bending section at the proximal end. As the tension of the traction rope increases, the second bending section at the proximal end can also bend, thereby enabling the active bending section to achieve a distal bend first and a proximal bend last.

[0021] The active bending segment's distal end bends before its proximal end, thus reducing the area swept by the distal end during bending. This reduces the difficulty of the procedure during surgery, for example, when bending the active bending segment from the superior to the inferior calyx. It also prevents kidney damage caused by excessive sweeping of the active bending segment during bending. The active bending segment of the present invention addresses the technical issue in related art where the distal end of the active bending segment sweeps a large area during bending, making it difficult for the surgeon to perform the procedure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 is a schematic diagram of an endoscope according to an embodiment of the present utility model;

[0024] Figure 2 This is a first schematic diagram of active curvature according to an embodiment of the present utility model;

[0025] Figure 3 This is a second schematic diagram of active curvature according to an embodiment of the present invention;

[0026] Figure 4 yes Figure 3 Enlarged view of part A;

[0027] Figure 5 It is a schematic diagram of the first curved section of an embodiment of the present utility model;

[0028] Figure 6 It is a schematic diagram of the snake bone joint of the embodiment of the utility model;

[0029] Figure 7This is a schematic diagram of the cooperation between the connecting piece and the second curved section in an embodiment of the present utility model;

[0030] Figure 8 yes Figure 7 Enlarged view of part B;

[0031] Figure 9 This is a schematic diagram of an injection molded tube according to an embodiment of the present invention;

[0032] Figure 10 It is a schematic diagram of the bending path of the active bending section in an embodiment of the present utility model.

[0033] In the figure: 100, active bending section; 110, first bending section; 111, snake bone joint; 111a, first through hole; 111b, slot; 112, rivet; 120, second bending section; 121, injection-molded tube; 121a, first channel; 121b, second channel; 130, connecting part; 131, step surface; 140, traction rope; 200, passive bending section; 300, insertion part; 400, handle. DETAILED DESCRIPTION

[0034] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0035] The terms "first," "second," and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present invention can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, the term "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0036] In each embodiment of the present invention, "proximal end" and "distal end" refer to the position of each component relative to the user in the use environment, wherein the end closer to the user is designated as the "proximal end" and the end farther from the user is designated as the "distal end".

[0037] In related art, the active bending section consists of multiple snake-bone units. Each unit has a traction rope channel on its wall for passage of a traction rope. The traction rope channel is recessed toward the center of the active bending section, and this recessed area is used to install the traction rope. The traction rope passes through each snake-bone unit, with the distal end of the traction rope fixed to the distal end of the active bending section. Furthermore, adjacent snake-bone units are connected by rivets. When the traction rope is used to control the bending of the active bending section, the applied force must overcome the friction between the rivet and the snake-bone unit to bend the active bending section.

[0038] However, the inventors discovered that when the active bending segment is controlled to bend by a traction rope, the force exerted by the traction rope causes the proximal end of the active bending segment to bend first and the distal end to bend later. This bending method results in a larger area swept by the distal end of the active bending segment during the bending process. When the doctor uses it during surgery, if it is necessary to bend the active bending segment to the infrarenal calyx end, the operation is more difficult.

[0039] To this end, the present invention provides an active bending section, the proximal end of which is formed by an injection-molded tube. This integral structure offers greater bending resistance than the section formed by the flexible connection of the serpentine joints. This allows the distal end of the active bending section to bend more easily than the proximal end. This allows the active bending section to bend distally first, followed by the proximal end. This bending configuration helps reduce the area swept by the distal end of the active bending section during bending, making it easier for doctors to operate during surgery.

[0040] The following is combined with Figures 1 to 10 , the active bending section, insertion portion and endoscope provided by the present invention are described in detail through specific embodiments and their application scenarios.

[0041] The first aspect of this embodiment provides a detailed description of the active bending segment.

[0042] The active bending section 100 of this embodiment is used for endoscopes. Figure 1 As shown, the endoscope includes an insertion portion 300 and a handle 400. The insertion portion 300 is used to be inserted into the cavity, and the handle 400 is provided with an operating member for the convenience of the doctor's operation. The insertion portion 300 has an active bending section 100 and a passive bending section 200. The active bending section 100 is located at the distal end, and the passive bending section 200 is located at the proximal end. Figure 1 As shown. The insertion portion 300 is also provided with an instrument channel for inserting instruments. The distal end surface of the active bending section 100 is provided with a camera module and other structures. The active bending section 100 can be in a straight state or a bent state under the action of the traction rope 140. Figure 2 and Figure 3 FIG. 1 is a schematic diagram showing the active bending section 100 in a straightened state.

[0043] The active bending section of this embodiment includes a first bending section 110, such as Figure 2 and Figure 3 As shown. The first bending section 110 is located at the distal end of the active bending section. The first bending section 110 includes a plurality of snake bone segments 111, and two adjacent snake bone segments 111 are movably connected to achieve the bending action of the first bending section 110, as shown. Figure 2 、 Figure 3 and Figure 5 As shown. For example, two adjacent snake bone segments 111 are riveted together by rivets 112, so that under the tension of the traction rope 140, the snake bone segments 111 can rotate and bend to achieve the bending action of the first bending segment 110. Not limited to this, the first bending segment 110 can also be formed by integral cutting.

[0044] The active bending section of this embodiment further includes a second bending section 120, such as Figure 2 and Figure 3 As shown. The second bending segment 120 is located at the proximal portion of the active bending segment. The distal end of the second bending segment 120 is connected to the proximal end of the first bending segment 110. In some embodiments, the second bending segment 120 is an injection molded tube 121, and the bending resistance of the second bending segment 120 is greater than the bending resistance of the first bending segment 110. Exemplarily, the injection molded tube 121 is formed by extrusion of a single layer of polymer material, or the injection molded tube 121 is formed by extrusion of multiple layers of polymer material. The polymer material is, for example, Pebax material or FEP material. Exemplarily, the bending resistance of the second bending segment 120 can be made greater than the bending resistance of the first bending segment 110 by selecting the material and thickness of the injection molded tube 121. Exemplarily, the bending resistance of the second bending segment 120 is less than the bending resistance of the passive bending segment 200.

[0045] For example, the distal end and proximal end of the active bending segment 100 mentioned herein are defined by the middle of the active bending segment 100 as the dividing line, with the portion distal to the dividing line being the distal end of the active bending segment 100 and the portion proximal to the dividing line being the proximal end of the active bending segment 100. Without limitation, the distal end and proximal end of the active bending segment 100 may also be defined in other ways.

[0046] The first bending section 110 at the distal end is formed by a plurality of serpentine joints 111 being movably connected, and the second bending section 120 at the proximal end is an injection molded tube 121. When the active bending section is bent by controlling the traction rope 140, there is a gap between two adjacent serpentine joints 111, which is more flexible, so that the bending resistance of the first bending section 110 is smaller, and the second bending section 120 at the proximal end is an injection molded tube 121, and the injection molded tube 121 is an integrated structure, so that the bending resistance of the second bending section 120 is larger.

[0047] When the active bending section of the above embodiment bends, the first bending section 110 at the distal end can bend before the second bending section 120 at the proximal end. As the tension of the traction rope 140 increases, the second bending section 120 on the proximal side can also bend, thereby enabling the active bending section to bend first at the distal end and then at the proximal end. Figure 10 Schematic diagram showing that the distal end of the active bending segment bends before the proximal end.

[0048] On the other hand, the use of the injection-molded tube 121 to form the second curved section 120 can also make the second curved section 120 easy to manufacture and have low cost.

[0049] The active bending segment bends its distal end before its proximal end, thus reducing the area swept by the distal end during bending. This reduces the difficulty of the procedure during surgery, for example, when bending the active bending segment from the superior to the inferior calyx. It also prevents kidney damage caused by excessive sweeping of the active bending segment during bending. This solves the technical problem in related art where the distal end of the active bending segment sweeps a large area during bending, making it difficult for the surgeon to perform the procedure.

[0050] In some embodiments, the snake bone segment 111 has a first through hole 111a, and the first through hole 111a passes through the axial direction of the snake bone segment 111. Figure 6 When multiple snake bone segments 111 are connected to each other, the first through holes 111a of each snake bone segment 111 are connected to each other to allow instruments to pass through. Preferably, the first through holes 111a of each snake bone segment 111 are coaxially arranged to facilitate the insertion and removal of instruments.

[0051] In some embodiments, the inner wall of the snake bone segment 111 is further formed with at least two slots 111b, and the slots 111b are evenly distributed along the circumferential direction of the snake bone segment 111, such as Figure 6 The slot 111b is used to install the traction rope 140. The slot 111b can limit the movement of the traction rope 140 to prevent the traction rope 140 from interfering with the instrument passing through the instrument channel. For example, the slot 111b is formed by a recessed portion of the wall of the snake bone segment 111.

[0052] In some embodiments, the injection molded tube 121 is a multi-lumen tube, such as Figure 9 As shown. A multi-lumen tube is a tube having at least two lumens. For example, the injection tube 121 has a first channel 121a and at least two second channels 121b, as shown. Figure 9 The first channel 121a and the second channel 121b are both connected along the axial direction of the injection tube 121. The number of the second channels 121b is consistent with the number of the slots 111b on the snake bone segment 111.

[0053] When the second curved section 120 is connected to the first curved section 110, the first channel 121a and the first through-hole 111a remain coaxial. This allows the first channel 121a and the multiple first through-holes 111a to collectively form an instrument channel on the active curved section for the passage of instruments. When the second curved section 120 is connected to the first curved section 110, the second channel 121b and the slotted holes 111b remain coaxial. This allows the second channel 121b and the multiple slotted holes 111b to collectively form a traction rope installation channel on the active curved section for installing the traction rope 140, preventing interference between the traction rope 140 and instruments passing through the instrument channel.

[0054] In some embodiments, the active bending section further includes a connecting member 130, such as Figure 3 and Figure 4 As shown. The connector 130 is used to connect the first curved section 110 and the second curved section 120. Exemplarily, the connector 130 includes a plurality of connecting pieces, which are evenly distributed in the circumferential direction of the distal end of the injection tube 121. That is, the distal end of the injection tube 121 has a plurality of spaced connecting pieces in the circumferential direction, and the first curved section 110 and the second curved section 120 are connected by the plurality of connecting pieces. Without being limited thereto, the connector 130 may also be a ring-shaped structure, such as Figure 7 and Figure 8 shown.

[0055] For example, the proximal end of the connector 130 is embedded in the distal end of the injection tube 121, and the distal end of the connector 130 is fixedly connected to the snake bone segment 111, as shown in FIG. Figure 3 and Figure 4 For example, when the injection tube 121 is formed by injection molding or extrusion, the connector 130 is embedded in the distal end of the injection tube 121. Then, when the first curved segment 110 and the second curved segment 120 are connected, the connector 130 can be welded to the proximal distal serpentine segment 111 by laser welding. For example, the connector 130 is made of metal, which facilitates welding of the connector 130 and the serpentine segment 111.

[0056] In some embodiments, the thickness of the connector 130 is smaller than that of the injection tube 121, and a step surface 131 is formed between the distal end surface of the injection tube 121 and the connector 130, such as Figure 7 and Figure 8 shown.

[0057] For example, the connector 130 is embedded close to the inner wall of the injection tube 121, and the inner wall of the connector 130 is flush with the inner wall of the injection tube 121, and the formed step surface 131 is located outside the second curved section 120, as shown in FIG. Figure 8 As shown. Figure 3 and Figure 4As shown, the serpentine joint 111 is placed on the step surface 131, which can position the serpentine joint 111. At the same time, the outer wall surface of the serpentine joint 111 can be kept flush with the outer wall surface of the injection tube 121, avoiding the formation of a step structure on the outer wall surface of the active bending section, which can easily pinch the skin when the active bending section bends.

[0058] Exemplarily, the connector 130 is embedded close to the outer wall of the injection tube 121, and the outer wall of the connector 130 is flush with the outer wall of the injection tube 121. The formed step surface 131 is located on the inner side of the second curved section 120. The snake bone segment 111 is placed on the step surface 131 to position the snake bone segment 111. At the same time, the inner wall surface of the snake bone segment 111 can be kept flush with the inner wall surface of the injection tube 121 to ensure smooth insertion and removal of the instrument.

[0059] In some embodiments, two adjacent serpentine joints 111 are riveted together by rivets 112, and the frictional resistance generated between the rivets 112 and the serpentine joints 111 gradually increases from the distal end to the proximal end. For example, the frictional resistance generated between the rivets 112 and the serpentine joints 111 can be controlled by the tightening degree of the rivets 112. Specifically, in the first curved segment 110, the tightening degree of the rivets 112 gradually increases from the distal end to the proximal end, thereby gradually increasing the frictional resistance generated between the rivets 112 and the serpentine joints 111.

[0060] From the distal end to the proximal end, the friction resistance generated between the rivet 112 and the serpentine joint 111 gradually increases, so that the first bending section 110 forms a bending mode that gradually bends from the distal serpentine joint 111 to the proximal serpentine joint 111, which can further reduce the area swept by the active bending section when bending.

[0061] In some embodiments, the hardness of the injection molded tube 121 gradually increases from the distal end to the proximal end. In the second curved section 120, the hardness of the injection molded tube 121 gradually increases, so that the bending resistance of the injection molded tube 121 gradually increases from the distal end to the proximal end.

[0062] Exemplarily, the thickness of the injection-molded tube 121 gradually increases from the distal end to the proximal end, thereby achieving a gradually increasing hardness of the injection-molded tube 121 from the distal end to the proximal end.

[0063] Exemplarily, a groove is formed on the surface of the injection molded tube 121. The groove is located on the outer surface of the injection molded tube 121, and the groove does not penetrate the wall of the injection molded tube 121. By setting the groove, the risk of collapse of the injection molded tube 121 can be reduced when the active bending section bends. At the same time, the groove does not penetrate the wall of the injection molded tube 121, and there is still a certain bending resistance at the groove. From the distal end to the proximal end, the size of the groove gradually decreases. The size of the groove is, for example, at least one of the width, length and depth of the groove. From the distal end to the proximal end, the size of the groove gradually decreases, so that the hardness of the injection molded tube 121 gradually increases from the distal end to the proximal end.

[0064] In the above scheme, the bending resistance of the second bending segment 120 gradually increases from the distal end to the proximal end, so that the second bending segment 120 can form a bending mode that gradually bends from the distal end to the proximal end, which can further reduce the area swept by the active bending segment when bending.

[0065] In some embodiments, the active bending section 100 further includes a skin that covers at least the first bending section 110. The covering effect of the skin protects the serpentine joint 111 and also forms a smooth surface structure on the surface of the first bending section 110.

[0066] The second aspect of this embodiment describes the insertion portion in detail.

[0067] The inserting portion 300 of this embodiment includes an active bending section 100, such as Figure 1 The active bending section 100 is the active bending section of any technical solution in this embodiment. The insertion portion 300 of this embodiment also includes a passive bending section 200, the distal end of the passive bending section 200 is connected to the proximal end of the active bending section 100, as shown. Figure 1 The structure of the passive bending section 200 may be the same as that in the prior art, and will not be described in detail here.

[0068] The insertion portion 300 of this embodiment has an active bending segment 100 according to any one of the technical solutions in this embodiment. When the active bending segment 100 is controlled to bend by a traction rope, the distal end of the active bending segment 100 can be bent first and the proximal end can bend later. This bending method is beneficial for reducing the area swept by the distal end of the active bending segment 100 during the bending process. When used by doctors during surgery, it can reduce the difficulty of operation and the probability of tissue damage.

[0069] The third aspect of this embodiment provides a detailed description of the endoscope.

[0070] The endoscope of this embodiment includes an insertion portion 300, such as Figure 1The insertion portion 300 is the insertion portion of any technical solution in this embodiment. The endoscope of this embodiment also includes a handle 400, which is connected to the proximal end of the insertion portion 300. Figure 1 The handle 400 may be a structure of the prior art, and will not be described in detail here.

[0071] The endoscope system of this embodiment can be a digestive endoscope, bronchoscope, pyeloscope, esophagoscope, gastroscope, colonoscope, otoscope, rhinoscope, oral mirror, laryngoscope, colposcope, laparoscope, arthroscope, etc. This embodiment does not impose any specific restrictions on the type of endoscope system.

[0072] The endoscope of this embodiment has an insertion portion according to any one of the technical solutions of this embodiment, which can reduce the difficulty of operation when used by doctors during surgery and can also reduce the probability of tissue damage.

[0073] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0074] Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of the present invention is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in reverse order, depending on the functions involved. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to certain examples may be combined in other examples.

[0075] The above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An active bending section for an endoscope, characterized in that: The active bending section comprises a first bending section (110) and a second bending section (120), wherein: The first bending section (110) comprises a plurality of snake bone joints (111), and two adjacent snake bone joints (111) are movably connected to achieve a bending action of the first bending section (110); The distal end of the second curved section (120) is connected to the proximal end of the first curved section (110), the second curved section (120) is an injection-molded tube (121), and the bending resistance of the second curved section (120) is greater than the bending resistance of the first curved section (110).

2. The active bending section according to claim 1, characterized in that: The snake bone segment (111) has a first through hole (111a), and the first through hole (111a) passes through the snake bone segment (111) in the axial direction. The inner wall of the snake bone segment (111) is further formed with at least two slots (111b), and the slots (111b) are evenly distributed along the circumferential direction of the snake bone segment (111).

3. The active bending section according to claim 2, characterized in that: The injection molding tube (121) is a multi-lumen tube, and the injection molding tube (121) has a first channel (121a) and at least two second channels (121b), the first channel (121a) and the second channel (121b) are both connected along the axial direction of the injection molding tube (121), and when the second curved section (120) is connected to the first curved section (110), The first channel (121a) and the first through hole (111a) remain coaxial, and the second channel (121b) and the slot hole (111b) remain coaxial.

4. The active bending section according to claim 1, characterized in that: It also includes a connecting piece (130), the proximal end of the connecting piece (130) is embedded in the distal end of the injection tube (121), and the distal end of the connecting piece (130) is fixedly connected to the snake bone segment (111).

5. The active bending section according to claim 4, characterized in that: The thickness of the connecting piece (130) is smaller than the thickness of the injection molding tube (121), and a step surface (131) is formed between the distal end surface of the injection molding tube (121) and the connecting piece (130). The step surface (131) is located inside or outside the second curved section (120), and the step surface (131) is used to position the snake bone segment (111) and keep the wall surface of the snake bone segment (111) flush with the wall surface of the injection tube (121).

6. The active bending section according to claim 4, characterized in that: The connecting piece (130) comprises a plurality of connecting pieces, and the connecting pieces are evenly distributed in the circumferential direction of the distal end of the injection molded tube (121); Alternatively, the connecting member (130) is a ring-shaped structure.

7. The active bending segment according to any one of claims 1 to 6, characterized in that: Two adjacent snake bone segments (111) are riveted together by a rivet (112), and the frictional resistance generated between the rivet (112) and the snake bone segments (111) gradually increases from the distal end to the proximal end.

8. The active bending segment according to any one of claims 1 to 6, characterized in that: The hardness of the injection molded tube (121) gradually increases from the distal end to the proximal end.

9. An insertion portion, characterized in that: The invention comprises an active bending segment (100) and a passive bending segment (200), wherein the active bending segment (100) is the active bending segment according to any one of claims 1 to 8, and the proximal end of the active bending segment (100) is connected to the distal end of the passive bending segment (200).

10. An endoscope, characterized in that: The invention comprises an insertion part (300) and a handle (400), wherein the insertion part (300) is the insertion part according to claim 9, and the proximal end of the insertion part (300) is connected to the handle (400).

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