Insertion part and endoscope

Abstract

The invention discloses an insertion part and an endoscope, and relates to the field of medical instruments.The insertion part comprises a first section and a second section, the far end of the first section is provided with a front end assembly, the first section is provided with a first channel, the second section is connected with the near end of the first section, the second section is provided with a second channel, and an opening of the second channel is formed in the side face of the second section; the first channel penetrates from the distal end of the first section to the proximal end of the second section. The insertion part is provided with a first channel and a second channel which are relatively independent, and the first channel and the second channel are matched with each other, so that more complex work is realized. The opening of the second channel is formed in the side face of the second section, so that the front end assembly of the first section can be avoided, the size of the opening of the second channel is larger, the situation that the second channel occupies the far-end space of the insertion part is avoided, the size of the end of the insertion part is reduced, and the insertion part can be inserted into a sheathing canal or a human body cavity more smoothly.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to an insertion portion and an endoscope. Background Art

[0002] Guide sheaths and endoscopes are high-precision medical devices specially designed and widely used in the field of urinary system inspection and treatment. As an auxiliary tool, the guide sheath is usually used to guide the endoscope or other medical devices into the urinary system to ensure the accuracy and safety of the operation. Its design fully considers the physiological structure of the human urinary system, can effectively reduce trauma and complications during surgery, and improve the success rate of surgery and the speed of patient recovery.

[0003] During stone surgery, the insertion part of the endoscope is inserted into the renal pelvis. In addition, in order to promote the discharge of stones and prevent infection, it is necessary to inject media such as physiological saline and distilled water into the human body. The stones are observed and broken by lasers, etc. After the stones are broken, the sheath can be used to provide a negative pressure environment to suck the stones into the gap between the sheath and the insertion part, thereby expelling the stones. However, it is necessary to insert the sheath and the endoscope in turn, which is cumbersome to use. In addition, the position of the insertion part in the sheath is uncertain, and the insertion part will hinder the stones from passing through the gap, which may cause problems with smooth stone discharge. Summary of the invention

[0004] In view of the above shortcomings of the related technologies, the present application provides an insertion portion and an endoscope to solve the above technical problems.

[0005] The present application provides an insertion portion of an endoscope, the insertion portion comprising a first section and a second section, the distal end of the first section being provided with a front end assembly, the first section having a first channel, the second section being connected to the proximal end of the first section, the second section having a second channel, the opening of the second channel being provided on the side of the second section, and the first channel penetrating from the distal end of the first section to the proximal end of the second section.

[0006] In one embodiment of the present application, the front end component and the second channel are located on the same side of the first channel, and the second channel and the front end component are arranged in sequence along the axis of the insertion portion.

[0007] In one embodiment of the present application, the end surface surrounding the opening is configured as a first inclined surface, and in the direction from the first section to the second section, the first inclined surface is inclined outward along the radial direction of the insertion portion.

[0008] In one embodiment of the present application, the front-end component and the second channel are spaced apart.

[0009] In one embodiment of the present application, one end of the first section close to the second channel is configured as a second inclined surface, and in the direction from the first section to the second section, the second inclined surface is inclined inwardly along the radial direction of the insertion portion.

[0010] In one embodiment of the present application, the first section is configured as a curved section, and at least one curved direction of the first section intersects with an arrangement direction of the first channel and the second channel.

[0011] In one embodiment of the present application, the insertion portion includes an instrument tube, the first channel is formed in the instrument tube, and the tube wall of the instrument tube surrounding the second channel is recessed.

[0012] In one embodiment of the present application, in the axial direction of the insertion portion, the projection of the first section is located within the projection of the second section.

[0013] In one embodiment of the present application, along the axial direction of the insertion portion, the projection of the second channel is at least partially located outside the projection of the first section.

[0014] In one embodiment of the present application, a projection area of ​​the front end component in the axial direction of the insertion portion is smaller than the second channel.

[0015] In one embodiment of the present application, the direction of the opening is from the proximal end to the distal end of the insertion portion.

[0016] To achieve the above-mentioned purpose and other related purposes, the present application provides an endoscope, including the aforementioned insertion portion.

[0017] The technical solution adopted by the present invention can achieve the following beneficial effects: the insertion part has a relatively independent first channel and a second channel, and the first channel and the second channel cooperate with each other to achieve more complex work. In addition, the insertion part can also complete the work of extracting and injecting the medium without the cooperation of the sheath, thereby improving the use efficiency of the insertion part. For example, in stone surgery, medical staff can directly insert the insertion part into the cavity of the human body, and insert treatment instruments such as lasers and / or inject media such as saline through the first channel to crush the stones. Medical staff can synchronously control the second channel to generate negative pressure, and the second channel can suck the broken stone particles and the medium out of the body together. In addition, the opening of the second channel is formed on the side of the second section, and the setting can avoid the front end component of the first section, so that the size of the opening of the second channel is larger, avoiding the second channel occupying the distal space of the insertion part, and reducing the end volume of the insertion part, so that the insertion part can be more smoothly in the human body cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0019] Figure 1is a schematic structural diagram of an insertion portion shown in an exemplary embodiment of the present application; Figure 2 is a schematic structural diagram of an insertion portion from another perspective shown in an exemplary embodiment of the present application; Figure 3 is a schematic structural diagram of another insertion portion shown in an exemplary embodiment of the present application; Figure 4 is a structural schematic diagram of another insertion portion shown in an exemplary embodiment of the present application; Figure 5 is a structural schematic diagram of yet another insertion portion shown in an exemplary embodiment of the present application; Figure 6 is a structural schematic diagram of an insertion portion shown in another exemplary embodiment of the present application; Figure 7 is a schematic diagram of the structure of the second section shown in an exemplary embodiment of the present application; Figure 8 is a schematic structural diagram of an insertion portion at another viewing angle shown in an exemplary embodiment of the present application; Fig. 9 It is a schematic diagram of the structure of an endoscope shown in an exemplary embodiment of the present application.

[0020] In the figure: 1, endoscope; 100, insertion part; 110, first section; 111, front end assembly; 112, first channel; 113, second slope; 120, second section; 121, second channel; 122, opening; 123, first slope; 130, instrument tube. DETAILED DESCRIPTION

[0021] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0022] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one 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 specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0023] In each embodiment of the present application, "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".

[0024] Guide sheaths and endoscopes are high-precision medical devices specially designed and widely used in the field of urinary system inspection and treatment. As an auxiliary tool, the guide sheath is usually used to guide the endoscope or other medical devices into the urinary system to ensure the accuracy and safety of the operation. Its design fully considers the physiological structure of the human urinary system, can effectively reduce trauma and complications during surgery, and improve the success rate of surgery and the speed of patient recovery.

[0025] During stone surgery, the insertion part of the endoscope is inserted into the renal pelvis. In addition, in order to promote the discharge of stones and prevent infection, it is necessary to inject media such as physiological saline and distilled water into the human body. The stones are observed and broken by lasers, etc. After the stones are broken, the sheath can be used to provide a negative pressure environment to suck the stones into the gap between the sheath and the insertion part, thereby expelling the stones. However, it is necessary to insert the sheath and the endoscope in turn, which is cumbersome to use. In addition, the position of the insertion part in the sheath is uncertain, and the insertion part will hinder the stones from passing through the gap, which may cause problems with smooth stone discharge.

[0026] In the prior art, the insertion part is provided with two different channels, but the front end of the insertion part is provided with a front end component, such as a camera module, a lighting module, etc. This arrangement causes the front end of the insertion part to be too large, making it difficult to insert into the sheath or the human body cavity, thus affecting the use of the endoscope.

[0027] The present application provides an insertion portion 100 of an endoscope 1, which is referred to as the insertion portion 100 hereinafter. Figure 1 The insertion part 100 is used to be inserted into various lumens and body cavities of the human body, such as the digestive tract, respiratory tract, etc. The insertion part 100 can be rotated to a specified direction to facilitate observation and treatment by medical staff.

[0028] It is understandable that the insertion part 100 is directly inserted into various tube cavities and body cavities of the human body, or a sheath is first inserted to establish a channel in the human body using the sheath, and then the insertion part 100 is inserted into the sheath. The use of the insertion part 100 is not limited here.

[0029] See also Figure 1 as well as Figure 2 The insertion portion 100 may include a first section 110 and a second section 120, and the second section 120 is connected to the proximal end of the first section 110. For example, the first section 110 may be an active bending section, and the second section 120 may be a passive bending section, etc., which is not limited in this embodiment. The medical staff may operate the operating end of the endoscope 1 to control the first section 110 to bend in a designated direction around.

[0030] Among them, the far end of the first section 110 is configured with a front-end component 111, and the front-end component 111 of the first section 110 may include a camera module. Under the control of medical staff, the first section 110 can be rotated to a specified direction, and then the camera module can obtain the image signal of the specified position, so that the medical staff can observe and control the equipment to perform treatment operations.

[0031] Please review Figure 1 The first section 110 has a first channel 112, and the first channel 112 runs from the distal end of the first section 110 to the proximal end of the second section 120. The first channel 112 is used to insert a treatment instrument, such as a biopsy forceps, a laser, etc., and / or, the first channel 112 is used to inject a medium, such as saline, distilled water, etc. Exemplarily, the first channel 112 can guide the biopsy forceps into the body while injecting saline into the body. In this embodiment, the shape and use of the first channel 112 are not limited.

[0032] Please continue reading Figure 1 , the second section 120 may have a second channel 121, and the second channel 121 and the first channel 112 are independent of each other, and the functions of the two may be the same or different, so that medical staff can operate the insertion part 100 more flexibly. For example, in stone surgery, the insertion part 100 is inserted into the cavity of the human body, and the medical staff can insert a laser or other treatment instrument through the first channel 112 to break the stone, and use the first channel 112 to inject a medium such as saline into the human body to promote the discharge of the stone and prevent infection. The medical staff can synchronously control the second channel 121 to generate negative pressure, and the second channel 121 can suck the broken stone particles and the medium out of the body together.

[0033] It is understandable that in some other cases, medical staff operate the insertion part 100, inject the medium into the human body through the second channel 121, and insert a treatment instrument such as a laser through the second channel 121. The stone particles and the medium are then sucked out of the body together through the first channel 112, and the specific use of the first channel 112 and the second channel 121 is not limited here. In addition, because the insertion part 100 has an independent first channel 112 and a second channel 121, the insertion part 100 can be directly inserted into the human body, reducing the operation steps to improve the efficiency of the operation. The insertion part 100 can still be used in the sheath. According to the specific implementation purpose and implementation scenario of the endoscope 1, the specific implementation method of the insertion part 100 is selected and designed, which is not repeated here.

[0034] like Figure 1 as well as Figure 2 As shown, the opening 122 of the second channel 121 is opened on the side of the second section 120, that is, the opening 122 of the second channel 121 is formed on the side of the insertion part 100. This arrangement can prevent the second channel 121 from occupying the distal end space of the insertion part 100, reduce the volume of the end of the insertion part 100, so that the insertion part 100 can be inserted into the sheath or other human body catheter more smoothly. At the same time, the insertion part 100 can also have a larger space to arrange the camera module and the first channel 112.

[0035] Preferably, the direction of the opening 122 is from the proximal end to the distal end of the insertion portion 100, that is, the direction of the opening 122 is the same as the extension direction of the insertion portion 100 at the opening 122. When the insertion portion 100 is bent, the direction of the opening 122 is not the line between the proximal end and the distal end of the insertion portion 100, but the extension direction of the insertion portion 100 at the opening 122. For example, the specific direction of the opening 122 is as follows: Figure 2 This arrangement can minimize the obstruction of the material during the discharge process and enable the discharged material to pass through the opening 122 more smoothly, thereby improving the discharge efficiency.

[0036] When the second channel 121 and the front end assembly 111 are arranged on opposite sides, the volume of the insertion part 100 will increase accordingly. In this embodiment, the cross section of the first section 110 is larger than that of the second section 120, that is, the volume of the first section 110 is larger than that of the second section 120, and the first section 110 with a larger volume can accommodate the front end assembly 111 to ensure the safety of the use of the front end assembly 111. The front end assembly 111 and the second channel 121 are located on the same side of the first channel 112, and the second channel 121 and the front end assembly 111 are arranged along the axis of the insertion part 100, and the opening 122 faces the front end assembly 111. This setting can reduce the volume of the insertion part 100, and can also ensure that the first channel 112 is distributed straight, avoiding the bending of the first channel 112 to affect the discharge efficiency of the medium and hinder the entry of medical devices into the first channel 112.

[0037] See also Figure 3 , the end surface surrounding the opening 122 can be configured as a first bevel 123, and in the direction from the first section 110 to the second section 120, the first bevel 123 is inclined outward along the radial direction of the insertion portion 100. The first bevel 123 has a guiding function, which can gradually and smoothly contact and adapt to the surface of the inserted human body part or sheath. Compared with right angles or sharp edges, the first bevel 123 can significantly reduce the friction and resistance during the insertion of the insertion portion 100, thereby reducing the risk of damage to the patient's tissue. Due to the reduced insertion resistance, medical staff can more easily control the endoscope 1 during operation, reducing the difficulty and time of operation. At the same time, patients can also feel less pain and discomfort, thereby improving the overall treatment experience.

[0038] In one embodiment, please refer to Figure 2 , one end of the first section 110 close to the second channel 121 is configured as a second inclined surface 113, and in the direction from the first section 110 to the second section 120, the second inclined surface 113 is inclined inwardly along the radial direction of the insertion portion 100. The second inclined surface 113 has a guiding function, and the second inclined surface 113 is inclined inwardly in the radial direction from the first section 110 to the second section 120, and the thickness of the proximal end of the front end component 111 of the first section 110 gradually changes. The gradually changing space can guide the medium and the material to be discharged to the opening 122 more smoothly, so as to improve the discharge effect of the second channel 121.

[0039] In another embodiment, see Figure 4 , the front end component 111 is spaced apart from the second channel 121. In other words, there is a certain gap between the opening 122 of the second channel 121 and the front end component 111 of the first section 110. The front end component 111 and the second channel 121 can be located on the same side of the first channel 112, with a sufficient gap between the two for passing the substances to be removed, such as stone particles, etc. Among them, the distance between the front end component 111 and the second channel 121 can be selected and designed according to the specific implementation objectives and suction effects, etc., and this implementation does not limit it. This setting can improve the suction effect of the second channel 121 and prevent the front end component 111 from blocking the opening 122.

[0040] Understandably, in some other cases, such as Figure 5 As shown, one end of the first section 110 close to the second channel 121 is configured as the second inclined surface 113, and the front end component 111 is spaced apart from the second channel 121. This arrangement can increase the distance between the front end component 111 and the second channel 121, and can further improve the discharge effect of the second channel 121, which will not be described in detail here.

[0041] In this example, see Figure 6 , the first section 110 is configured as a bending section. Among them, the bending section can be an active bending section or a passive bending section. Exemplarily, when the first section 110 is an active bending section, the medical staff can operate the operating end of the endoscope 1 to control the first section 110 to bend in the specified directions around. Alternatively, when the first section 110 is a passive bending section, the first section 110 is constrained by the human body cavity and the like to perform bending operations to adapt to the curved cavity. At least part of the first channel 112 and the camera module of the front end assembly 111 are arranged in the first section 110, and the first section 110 can drive the camera module and the distal end of the instrument tube 130 to bend, so that the medical staff can observe more images and operate the insertion part 100 to enter more places for treatment.

[0042] When the inserting portion 100 is bent, the bent inserting portion 100 may block the opening 122, thereby causing a poor suction effect of the second channel 121. Figure 6 , at least one bending direction of the first section 110 intersects with the arrangement direction of the first channel 112 and the second channel 121. Exemplarily, the first section 110 can be bent along at least a first direction (such as Figure 6 The distribution direction of the first channel 112 and the second channel 121 is the second direction (as shown in L2 in FIG. Figure 6 The first section 110 is bent along the first direction and does not completely squeeze or cover the opening 122, ensuring that the bent insertion portion 100 can still absorb the material to be discharged, thereby improving the use effect of the insertion portion 100.

[0043] Preferably, see Figure 7 The insertion portion 100 may include an instrument tube 130, the first channel 112 is formed in the instrument tube 130, and the tube wall of the instrument tube 130 that surrounds the second channel 121 is recessed. In other words, the first channel 112 and the second channel 121 are adjacently arranged, and a portion of the tube wall of the instrument tube 130 located in the second section 120 surrounds the second channel 121, and the tube wall faces a direction away from the second channel 121 (the direction is as shown in FIG. 1 ). Figure 7 The second channel 121 is provided with a concave shape (as shown in L4 in the figure), which can give way to the second channel 121, so that at least part of the cross-sectional shape of the second channel 121 is roughly circular. The second channel 121 with a circular configuration has no dead corners, which prevents the material to be discharged from accumulating or clogging in the second channel 121. In contrast, channels of other shapes (such as rectangles) may have four smaller angles, where the material to be discharged may be blocked, thereby affecting the use effect of the second channel 121. In addition, this configuration can also ensure that the cross-sectional area of ​​the first channel 112 can be larger, so as to increase the flow rate of the first channel 112.

[0044] In this example, see Figure 8 , in the axial direction of the insertion part 100, the projection of the first section 110 is located within the projection of the second section 120. When the projection of the first section 110 is located outside the second section 120, when the insertion part 100 is inserted into the sheath, the first section 110 can abut against the inner wall of the sheath and push the second section 120 away from the inner wall of the sheath, which causes a gap to be formed between the second section 120 and the inner wall of the sheath, and the material to be discharged enters the gap, but is not sucked out of the body by the second channel 121, which will hinder the movement of the insertion part 100 in the sheath. This setting can prevent the front end component 111 of the first section 110 from affecting the relative position of the second channel 121 and the inner wall of the sheath, ensure the position and shape of the second channel 121, and ensure that the second channel 121 has a smooth suction path.

[0045] In a more specific implementation, please continue to refer to Figure 8 , the projection area of ​​the front-end component 111 in the axial direction of the insertion part 100 is smaller than the second channel 121. Exemplarily, the front-end component 111 can be a camera module, and the camera module is arranged on one side of the distal end of the first channel 112 so that the camera module can obtain a clearer image. At the same time, the front-end component 111 and the second channel 121 are in the axial direction of the insertion part 100, and at least part of the second channel 121 is not blocked by the front-end component 111, and the material to be discharged can be directly sucked into the second channel 121 from the distal end of the insertion part 100. In addition, the tube wall forming the second channel 121 can abut the inner wall of the sheath tube so that the first section 110 is offset relative to the sheath tube, which is conducive to the material to be discharged entering the second channel 121 and being discharged.

[0046] Furthermore, if Figure 8 As shown, along the axial direction of the insertion portion 100, the projection of the second channel 121 is at least partially located outside the projection of the first section 110. At least part of the second channel 121 is not blocked by the first section 110, and the material to be discharged can be directly sucked into the second channel 121 from the distal end of the insertion portion 100, thereby improving the discharge effect of the second channel 121.

[0047] In addition, when the insertion part 100 is inserted into the sheath, the distal end of the first section 110 can also be configured with a guide structure (not shown), and the guide structure cooperates with the limiting structure of the sheath. The limiting structure can constrain the insertion part 100, and relative to the sheath, the insertion part 100 is biased toward one side, so that the space on the other side of the insertion part 100 is larger. The larger space can accommodate a larger second channel 121. Along the axial direction of the insertion part 100, the projection area of ​​the second channel 121 outside the projection of the first section 110 can be configured larger, thereby improving the discharge effect of the second channel 121.

[0048] To achieve the above-mentioned and other related purposes, the present application provides an endoscope 1, see Fig. 9 , the endoscope 1 may include the aforementioned insertion portion 100. In this way, the endoscope 1 has the beneficial effects of any of the aforementioned solutions, which will not be repeated here. The endoscope 1 may be a bronchoscope, a pyeloscope, an esophagoscope, a gastroscope, a colonoscope, an otoscope, a rhinoscope, a stomatoscope, a laryngoscope, a colposcope, a laparoscope, an arthroscope, etc. The embodiment of the present application does not specifically limit the type of the endoscope 1.

[0049] The technical solution adopted by the present invention can achieve the following beneficial effects: the insertion part 100 has a relatively independent first channel 112 and a second channel 121, and the first channel 112 and the second channel 121 cooperate with each other to achieve more complex work. In addition, the insertion part 100 can also complete the work of extracting and injecting the medium without the need for the cooperation of the sheath, thereby improving the use efficiency of the insertion part 100. For example, in stone surgery, medical staff can directly insert the insertion part 100 into the cavity of the human body, and insert treatment instruments such as lasers and / or inject media such as saline through the first channel 112 to break the stones. Medical staff can synchronously control the second channel 121 to generate negative pressure, and the second channel 121 can suck the broken stone particles and the medium out of the body together. In addition, the opening 122 of the second channel 121 is formed on the side of the second section 120. This setting can avoid the front end component 111 of the first section 110 to make the size of the opening 122 of the second channel 121 larger, avoid the second channel 121 occupying the distal space of the insertion part 100, and reduce the end volume of the insertion part 100, so that the insertion part 100 can be inserted into the sheath or human body cavity more smoothly.

[0050] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0051] In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0052] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An insertion portion of an endoscope, characterized in that: include: A first section, a front end assembly is disposed at a distal end of the first section, and the first section has a first channel; A second section, the second section is connected to the proximal end of the first section, the second section has a second channel, the second channel has an opening, and the opening is opened on the side of the second section; The first channel runs from the distal end of the first section to the proximal end of the second section.

2. The insertion portion according to claim 1, characterized in that: The front end component and the second channel are located on the same side of the first channel, and the second channel and the front end component are arranged in sequence along the axis of the insertion portion.

3. The insertion portion according to claim 2, characterized in that: The end surface surrounding the opening is configured as a first inclined surface, and in a direction from the first section to the second section, the first inclined surface is inclined outward in a radial direction of the insertion portion.

4. The insertion portion according to claim 2, characterized in that: The front end component is spaced apart from the second channel.

5. The insertion portion according to claim 2, characterized in that: One end of the first section close to the second channel is configured as a second inclined surface, and in a direction from the first section to the second section, the second inclined surface is inclined inwardly along the radial direction of the insertion portion.

6. The insertion portion according to claim 2, characterized in that: The first section is configured as a curved section, and at least one curved direction of the first section intersects with an arrangement direction between the first channel and the second channel; And / or, the insertion portion includes an instrument tube, the first channel is formed in the instrument tube, and a tube wall of the instrument tube surrounding the second channel is recessed.

7. The insertion portion according to claim 2, characterized in that: In the axial direction of the insertion portion, the projection of the first section is located within the projection of the second section; And / or, along the axial direction of the insertion portion, the projection of the second channel is at least partially located outside the projection of the first section.

8. The insertion portion according to claim 7, characterized in that: A projection area of ​​the front end assembly in the axial direction of the insertion portion is smaller than the second channel.

9. The insertion portion according to any one of claims 1 to 8, characterized in that: The opening is oriented from the proximal end to the distal end of the insertion portion.

10. An endoscope, characterized in that: Comprising the insertion portion according to any one of claims 1-9.

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