A sheath and endoscope assembly

Abstract

The application relates to the technical field of endoscopes, in particular to a sheath pipe and an endoscope assembly. The sheath pipe comprises a pipe body, a inner pipe arranged at the distal end of the pipe body, and a capsule arranged on the inner wall of the pipe body. The inner pipe is connected with the pipe body through the capsule. The capsule has an axial expansion deformation stroke and a radial expansion deformation stroke. The deformation resistance of the axial expansion deformation stroke is greater than that of the radial expansion deformation stroke. The capsule, the inner pipe, the pipe body and the insertion part are cooperated with each other. The bending radius of the distal end of the insertion part is reduced, the rubbing between the distal end of the insertion part and the inner wall of the body cavity in the bending process is reduced, the operation safety is improved, and the efficiency and effect of the lithotripsy are improved. The capsule forms a neck in the pipe body, limits the outflow of the fluid and the gravel, inhibits the flying of the broken stones from the sheath pipe, guides and promotes the gravel into the suction channel to be quickly discharged, so that the cleaning effect and efficiency of the stones in the lithotripsy process are further improved.

Description

Technical Field

[0001] This invention relates to the field of endoscopy technology, and more particularly to a sheath and endoscopy assembly. Background Technology

[0002] A sheath is a tubular interventional device used in endoscopic surgery to establish, maintain, and protect the operative channel. It acts as an "intermediary channel" between the endoscope and human tissue—providing a reusable access route for both the endoscope and instruments, while also providing physical isolation and protection for the cavity walls (mucosa, blood vessel walls, meninges, nerve roots, etc.). After establishing the access, the frequency of sheath movement should be minimized to reduce damage to the cavity walls. On the other hand, when the sheath is used in conjunction with the endoscope within a limited cavity, such as in renal lithotomy, the bending radius of the endoscope limits its rapid entry into the renal calyces, making it difficult to handle stones within the calyces, especially those in the lower calyces. This often results in lower-than-expected stone removal results and efficiency. Summary of the Invention

[0003] The purpose of this application is to provide a sheath and endoscope assembly, which at least solves the technical problem of poor stone retrieval effect and efficiency.

[0004] This application is implemented as follows: In a first aspect, this application provides a sheath tube, including a tube body, an inner tube disposed at the distal end of the tube body, the inner tube being axially slidably connected to the tube body, a bladder disposed on the inner wall of the tube body, the inner tube being connected to the tube body through the bladder, the bladder having an axial expansion deformation stroke and a radial expansion deformation stroke, the deformation resistance of the axial expansion deformation stroke being greater than the deformation resistance of the radial expansion deformation stroke, and a fluid channel disposed on the tube body, the fluid channel being in communication with the bladder.

[0005] Secondly, this application provides an endoscope assembly, including an endoscope and the aforementioned sheath, with the insertion portion of the endoscope passing through the sheath.

[0006] The technical solution provided in this application can achieve the following beneficial effects: This application utilizes the coordinated operation of the capsule, inner tube, tube body, and insertion part to reduce the bending radius of the distal end of the insertion part, thereby reducing friction between the distal end of the insertion part and the inner wall of the body cavity during bending, improving surgical safety, and enhancing lithotripsy efficiency and effect. The capsule forms a neck in the tube body, restricting the outflow of fluid and lithotripsy fragments, inhibiting the fragmented stones from flying out of the sheath, and guiding and promoting the rapid discharge of the fragments into the suction channel, thus further improving the stone removal effect and efficiency during lithotripsy. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the structure of the endoscope assembly disclosed in the embodiments of this application; Figure 2 This is a schematic diagram of the internal structure of the sheath body disclosed in the embodiments of this application (the insertion part passes through the sheath body); Figure 3 yes Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the bending change of the insertion part when the bending radius of the insertion part is changed, as disclosed in the embodiments of this application; Figure 5 This is a schematic diagram of the internal structure of the sheath disclosed in the embodiments of this application (stone crushing is carried out inside the sheath); Figure 6 yes Figure 5 A magnified view of a section at point B in the middle; Figure 7 This is a schematic diagram of the working process of the sheath in the sheath for stone crushing, as disclosed in the embodiments of this application.

[0009] In the picture: 100, Handle; 200, Insertion section; 210, Active bending section; 220, Instrument channel; 310, Tube body; 311, Inner tube; 312, Capsule body; 3121, First connecting part; 3122, First deformable part; 3123, Second connecting part; 3124, Second deformable part; 313, Second flow channel; 320, Sheath seat; 321, First fluid interface; 400, Laser fiber. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0011] In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0012] In various embodiments of this application, "proximal end" and "distal end" refer to the position of the endoscope and its accessories relative to the user in the usage environment. 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".

[0013] Example 1

[0014] This embodiment provides an endoscope assembly, such as Figures 1-3 As shown, the device includes an endoscope and a sheath. The endoscope includes a handle 100 and an insertion part 200. The proximal end of the insertion part 200 is connected to the distal end of the housing of the handle 100. An instrument channel 220 is provided axially on the insertion part 200. The proximal port of the instrument channel 220 can be located on the handle 100. There can be one or more proximal ports of the instrument channel 220. The distal port of the instrument channel 220 is located at the distal end of the insertion part 200. The instrument channel 220 is used to allow surgical instruments, perfusion fluid, or negative pressure aspiration fluid to pass through. The surgical instruments are existing technologies and can be injection needles, dilators, stents, stone retrieval baskets, optical fibers, biopsy forceps, hemostatic clips, etc., without specific limitations. The perfusion fluid can be physiological saline, a drug, or a gas, without specific limitations.

[0015] The handle 100 is equipped with a lever structure, which controls the directional bending of the active bending section 210 at the distal end of the insertion part 200. The lever structure and the active bending section 210 are existing technologies, exemplarily described. The lever structure includes a lever, a traction wheel, and a traction rope. The distal end of the traction rope is connected to the distal end of the insertion part, and the proximal end of the traction rope is connected to the traction wheel. The lever is connected to the traction wheel. By manipulating the lever, the traction wheel rotates, pulling the traction rope on one side of the insertion part 200 towards the proximal end, while simultaneously releasing the traction rope on the other side of the insertion part 200 towards the distal end. The traction ropes on both sides of the active bending section 210 of the insertion part 200 move in opposite directions, thereby causing the active bending section 210 at the distal end of the insertion part 200 to bend further. In some examples, the insertion part 200 can be bent in one direction using a single-sided traction rope to control the active bending section 210 of the insertion part 200. Alternatively, multiple traction ropes can be used to achieve four-way bending of the active bending section 210 of the insertion part 200. All examples of lever structures that achieve the directional bending function of the insertion part 200 can directly adopt existing designs. The active bending section 210 can also adopt existing snake-bone unit structure designs, which will not be elaborated upon here. An illumination unit and a camera module can be installed on the distal end face of the insertion part 200. The illumination unit provides illumination light, and the camera module acquires image information of the interior of the distal cavity of the insertion part. The illumination unit and camera module are existing technologies and will not be elaborated upon here.

[0016] Specifically, such as Figures 2-7As shown, the sheath includes a tube body 310, and an inner tube 311 is provided at the distal end of the tube body 310. The inner tube 311 is axially slidably connected to the tube body 310. A bladder 312 is provided on the inner wall of the tube body 310. The inner tube 311 is connected to the tube body 310 through the bladder 312. The bladder 312 has an axial expansion deformation stroke and a radial expansion deformation stroke. The deformation resistance of the axial expansion deformation stroke of the bladder 312 is greater than the deformation resistance of the radial expansion deformation stroke. A fluid channel is provided on the tube body 310, and the fluid channel communicates with the bladder 312.

[0017] Specifically, the insertion part 200 of the endoscope passes through the body 310 of the sheath. The instrument channel 220 on the insertion part 200 can serve as a first flow channel, or an additional channel can be provided on the insertion part 200 as a first flow channel. The gap between the insertion part 200 and the body 310 is a second flow channel 313. One of the first flow channel and the second flow channel 313 is used to introduce perfusion fluid into the body cavity, and the other of the first flow channel and the second flow channel 313 is used to aspirate samples and / or perfusion fluid from the body cavity.

[0018] Based on the above structural design, the endoscope assembly can enhance the flexibility and ease of use of the endoscope in a limited space. For example, when using the endoscope assembly to clear stones in the kidney, a passage is established through the ureter via the sheath body 310, a natural body cavity. The distal end of the sheath body 310 is positioned at the ureteral orifice, allowing the endoscope insertion part 200 to quickly penetrate into the kidney. A laser fiber 400 is inserted through the instrument channel 220, and the laser fiber 400 generates a lithotripsy laser to pulverize the stones. During this process, one of the first and second flow channels 313 is used to introduce perfusion fluid into the kidney. The other of the first and second flow channels 313 is used for negative pressure aspiration of the renal perfusion fluid. This provides a clear field of view for the camera module and quickly removes the heat generated during the operation of the laser fiber 400, ensuring a safe and stable temperature and pressure balance within the kidney. In this example, the second flow channel 313 is preferably used as the perfusion channel for introducing the perfusion fluid into the kidney, while the first flow channel serves as the aspiration channel for negative pressure aspiration of the renal perfusion fluid. When it is necessary to control the distal end of the endoscope insertion part 200 to enter the renal calyx, or to control the distal end of the endoscope insertion part 200 to bend at a small radius, such as... Figures 2-4As shown, gas or liquid can be introduced into the capsule 312, causing it to expand and deform. Since the insertion part 200 passes through the tube, it restricts the radial expansion deformation of the capsule 312. This forces the capsule 312 to undergo axial expansion deformation primarily after it has expanded radially to abut against the circumferential wall of the insertion part 200. When the capsule 312 undergoes axial expansion deformation, it pushes the inner tube 311 to slide axially out of the distal end of the tube 310. On one hand, the inner tube 311 axially wraps around part of the active bending section 210 of the insertion part 200. By constraining and limiting the active bending section 210 with the inner tube 311, the directional bending resistance of the inner tube 311 increases sharply, thus... When controlling the active bending segment 210 of the insertion section 200 to bend in a directional manner, the unbound portion of the distal end of the active bending segment 210 is made easier to bend in a directional manner. This effectively reduces the bending radius of the distal end of the insertion section 200, reduces the friction between the distal end of the insertion section 200 and the inner wall of the body cavity during bending, improves surgical safety, and facilitates rapid switching of the endoscope's working point in the kidney for lithotripsy, improving lithotripsy efficiency and effect. On the other hand, since the outer wall of the tube 310 does not move relative to the adjacent inner wall of the body cavity (ureter) during the extension of the inner tube 311, there is no damage to the inner wall of the body cavity, effectively improving the safety of the endoscope assembly. In addition, to improve the lithotripsy and stone removal effect, such as Figures 5-7 As shown, the stone can be introduced into the tube 310 when the capsule 312 is in a collapsed state using the instrument channel 220, with the stone positioned proximal to the capsule 312. Then, liquid or gas is introduced into the capsule 312, causing it to expand and deform. Because the deformation resistance of the axial expansion deformation stroke of the capsule 312 is greater than that of the radial expansion deformation stroke, the capsule 312 preferentially undergoes radial expansion deformation without the restriction of the insertion part 200, forming a neck within the tube 310 to restrict the outflow of fluid and stone fragments. This works in conjunction with the second flow channel 313. As an infusion channel, the first flow channel also serves as an aspiration channel, allowing the infusion fluid to flow in the reverse direction after being guided by the capsule 312, pushing it towards the proximal end of the tube 310. Thus, when the laser fiber 400 is performing laser lithotripsy inside the sheath, the reverse-flowing infusion fluid, in conjunction with the aspiration channel, can not only effectively inhibit the fragmented stones from flying out of the sheath, but also guide and promote the stones to enter the aspiration channel for rapid discharge. This further improves the stone removal effect and efficiency during the lithotripsy process, and the sheath tube 310 physically isolates the laser from damaging the inner wall of the body cavity, improving the safety of the surgery.

[0019] In some embodiments, to achieve safe control of the bending radius of the insertion part 200 and efficient intrathecal lithotripsy, the tube body 310 can be configured to include a first state and a second state. In the first state, the inner tube 311 is at least partially located inside the tube body 310. When the insertion part 200 is located on the proximal side of the capsule 312, the introduction of liquid or gas into the capsule 312 can cause the capsule 312 to undergo radial expansion deformation, forming a neck in the sheath, which is beneficial for efficient and safe lithotripsy. In the second state, the distal end of the inner tube 311 is located outside the tube body 310. Based on the cooperation between the insertion part 200 and the capsule 312, the insertion part 200 restricts the radial expansion deformation of the capsule 312, allowing the capsule 312 to undergo expansion deformation of a preset axial length when a preset amount of liquid is introduced, thereby causing the inner tube 311 to extend out of the preset axial length, which is beneficial for achieving controllable and safe control of the bending radius of the insertion part 200.

[0020] In some embodiments, to achieve stable and safe control of the bending radius of the insertion part 200 and the purpose of efficient intrathecal lithotripsy, the axial sliding stroke of the inner tube 311 and the tube body 310 can be configured such that the first state corresponds to the upper limit of the sliding stroke, and the second state corresponds to the lower limit of the sliding stroke. In the first state, the sliding resistance of the inner tube 311 is greater than that in the second state. Alternatively, the sliding resistance of the inner tube 311 gradually decreases from the upper limit to the lower limit of the sliding stroke. The sliding resistance of the inner tube 311 and the tube body 310 is greatest in the first state, when the inner tube 311 is contracted within the tube body 310. This is combined with the fact that the deformation resistance of the axial expansion deformation stroke of the bladder 312 is greater than that of the radial expansion deformation stroke. The deformation resistance of the deformation stroke allows the bladder 312 to stably and preferentially undergo radial expansion deformation without the restriction of the insertion part 200, making it easy to form a neck in the tube 310 for safe and efficient stone removal. When the insertion part 200 passes through the bladder 312, the constraint of the insertion part 200 on the radial expansion deformation of the bladder 312 increases the infusion pressure on the bladder 312, which can cause the bladder 312 to undergo axial expansion deformation, pushing the inner tube 311 to extend from the distal end of the tube 310. This allows for controllable adjustment of the bending radius of the insertion part 200, making it easier for the insertion part 200 to perform more flexible and safe bending movements in a limited space, thereby improving the stone removal efficiency and effect.

[0021] Specifically, to facilitate the automatic return of the inner tube 311 to its first state after extension, the capsule 312 can be made of an elastic material. After the capsule 312 loses fluid pressure, its own elastic recoil force drives the inner tube 311 back into the tube body 310, thereby achieving automatic restoration of the sheath structure. This facilitates repeated operations or reduces interference with tissues when withdrawing from the body cavity. Simultaneously, this elastic characteristic helps maintain the structural stability of the capsule 312 during multiple expansion and contraction cycles, extending the instrument's service life and ensuring the consistency and reliability of each deformation response.

[0022] In some embodiments, to improve the passage of the insertion part 200 through the tube body 310, the distal end of the tube body 310 may be provided with a mounting groove, and the inner tube 311 and the bladder 312 may be disposed within the groove, thereby reducing the influence of the inner tube on the passage of the insertion part 200 through the tube body 310. The inner wall of the inner tube 311 may be provided as a smooth curved surface or coated with a lubricating material to further reduce mechanical resistance during sliding and avoid affecting the operation response speed due to jamming.

[0023] In some embodiments, to achieve efficient and safe lithotripsy, the sheath may include a sheath seat 320, with the proximal end of the tube body 310 connected to the sheath seat 320. The sheath seat 320 is provided with a first fluid interface 321, which communicates with the tube body to perform infusion or aspiration into the body cavity. The sheath seat 320 is also provided with a second fluid interface, which communicates with a fluid channel to control the expansion and deformation of the bladder 312, thereby regulating the position of the inner tube and the deformation state of the bladder. The first fluid interface 321 is used to connect to an external negative or positive pressure source to precisely adjust the fluid flow direction and pressure within the second flow channel 313, thus collaboratively completing infusion, aspiration, and directional guidance of the lithotripsy products.

[0024] In some embodiments, to more stably form a neck within the tube body 310 for efficient stone fragmentation, a damping element can be provided between the inner tube 311 and the tube body 310. This damping element increases the sliding resistance of the inner tube 311 in a first state. Preferably, the damping element is a unidirectional damping element. This element increases the sliding resistance of the inner tube 311 when it extends out of the tube body 310, effectively maintaining the stability of the inner tube 311's position during the radial expansion of the bladder 312, preventing accidental slippage due to fluid pressure fluctuations, and ensuring reliable neck formation. Simultaneously, when the inner tube 311 needs to extend, sufficient driving force can be applied to overcome this damping resistance, achieving controllable axial displacement. Furthermore, the unidirectional characteristic of the damping element allows the inner tube to smoothly reset when the bladder 312 depressurizes and retracts, avoiding return stroke jamming and improving operational smoothness and reusability. The damping element can be a unidirectional inclined groove microstructure provided on the outer peripheral wall of the inner tube 311 and / or the inner peripheral wall of the tube body 310. When unidirectional inclined groove microstructures are provided on both the outer peripheral wall of the inner tube 311 and the inner peripheral wall of the tube body 310, the inclination directions of the groove microstructures on the outer peripheral wall of the inner tube 311 and the inner peripheral wall of the tube body 310 are opposite, so as to achieve a unidirectional damping function. Based on this structural design, when the inner tube 311 slides outward, the groove microstructures interlock to generate a large frictional resistance, limiting its unintended movement; while when the inner tube 311 returns to its original position inward, the groove microstructures slide relatively smoothly, and the resistance is significantly reduced. This design not only improves the structural stability of the sheath during the stone crushing process, but also ensures the precise controllability of the inner tube's movement during operation. In addition, the damping element can also adopt alternative forms such as elastic clips, magnetic adsorption elements, or viscous fluid layers, as long as a unidirectional sliding resistance difference can be achieved. The specific selection can be flexibly adjusted according to the actual process conditions and usage requirements.

[0025] In some embodiments, to ensure that the deformation resistance of the axial expansion deformation stroke of the capsule 312 is greater than the deformation resistance of the radial expansion deformation stroke, the capsule 312 may include a first connecting portion 3121, a first deformation portion 3122, a second connecting portion 3123, and a second deformation portion 3124 connected sequentially end to end. The first connecting portion 3121 is connected to the tube body 310, the second connecting portion 3123 is connected to the inner tube 311, and the second deformation portion 3124 is located relative to the first deformation portion 3122. On the inner side, the deformation resistance of the first deformation part 3122 is greater than that of the second deformation part 3124. Therefore, when the bladder 312 is compressed and expands, the second deformation part 3124 on the inner side is preferentially caused to expand radially. When the second deformation part 3124 on the outer side is restricted radially, the two will work together to generate axial expansion deformation under a greater driving force, pushing the inner tube 311 to extend out of the distal end of the tube body 310, thereby adjusting the bending radius of the insertion part 200. This differentiated deformation characteristic allows the bladder 312 to respond as needed under different working conditions: when there is no restriction from the insertion part 200, the bladder 312 mainly expands radially, forming an effective neck; when the insertion part 200 passes through it and restricts radial expansion, the bladder 312 switches to axial expansion, pushing the inner tube 311 out, thereby achieving local rigidity control of the active bending section 210. This structural design, through the synergistic optimization of material distribution and geometric layout, enables function switching without the need for an additional drive mechanism, thereby improving the integration and operational reliability of the sheath system.

[0026] Specifically, the deformation resistance of the first deformation part 3122 can be made greater than that of the second deformation part 3124 by using different materials for the first deformation part 3122 and the second deformation part 3124. Alternatively, the thickness of the first deformation part 3122 can be made greater than that of the second deformation part 3124. Microstructures can also be provided on the first deformation part 3122 and / or the second deformation part 3124 to make the deformation resistance of the first deformation part 3122 greater than that of the second deformation part 3124. For example, axially arranged pleats or corrugated structures can be provided on the surface of the first deformation part 3122 to enhance its rigidity under radial pressure, thereby increasing the driving force threshold required for axial deformation. The second deformation part 3124 can be made of a smooth thin-walled structure or a microporous material with stronger radial ductility to reduce its radial expansion resistance. Furthermore, by adjusting the compartmentalization of the internal chambers of the capsule 312, the first deformation section 3122 and the second deformation section 3124 can produce differentiated responses under fluid pressure, further enhancing the controllable separation of axial and radial deformation behaviors. This multi-dimensional collaborative design not only improves the functional adaptability of the capsule 312 under complex working conditions, but also provides reliable support for the dynamic adjustment of the sheath at different surgical stages.

[0027] The endoscope provided in this application embodiment can be a nephroscope, or a bronchoscope, esophagoscope, gastroscope, colonoscope, otoscope, rhinoscope, oral endoscope, laryngoscope, colposcope, laparoscope, arthroscope, etc. This application embodiment does not specifically limit the type of endoscope.

[0028] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0029] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A sheath, characterized in that, The device includes a tube body, with an inner tube at the distal end of the tube body. The inner tube is axially slidably connected to the tube body. A bladder is provided on the inner wall of the tube body, and the inner tube is connected to the tube body through the bladder. The bladder has an axial expansion deformation stroke and a radial expansion deformation stroke. The deformation resistance of the axial expansion deformation stroke is greater than the deformation resistance of the radial expansion deformation stroke. A fluid channel is provided on the tube body, and the fluid channel communicates with the bladder.

2. The sheath according to claim 1, characterized in that, The tube body includes a first state and a second state. In the first state, the inner tube is at least partially located inside the tube body, and in the second state, the distal end of the inner tube is located outside the tube body.

3. A sheath according to claim 2, characterized in that, During the axial sliding stroke of the inner tube and the tube body, the first state corresponds to the upper limit of the sliding stroke, and the second state corresponds to the lower limit of the sliding stroke. In the first state, the sliding resistance of the inner tube is greater than that in the second state, or the sliding resistance of the inner tube gradually decreases from the upper limit of the sliding stroke to the lower limit of the sliding stroke.

4. A sheath according to any one of claims 1 to 3, characterized in that, The capsule is made of an elastic material; And / or, the distal end of the tube is provided with an installation groove, and the inner tube and the bladder are disposed in the groove.

5. A sheath according to claim 4, characterized in that, The sheath includes a sheath seat, and the proximal end of the tube body is connected to the sheath seat; The sheath seat is provided with a first fluid interface, which is connected to the tube body; and / or, the sheath seat is provided with a second fluid interface, which is connected to the fluid channel.

6. A sheath according to any one of claims 1 to 3, characterized in that, A damping element is provided between the inner tube and the tube body, and the damping element is used to increase the sliding resistance of the inner tube in the first state.

7. A sheath according to claim 6, characterized in that, The damping component is a damping component with unidirectional damping function, which is used to increase the sliding resistance when the inner tube extends out of the tube body.

8. A sheath according to any one of claims 1 to 3, characterized in that, The capsule includes a first connecting part, a first deformable part, a second connecting part, and a second deformable part that are connected in sequence around each other. The first connecting part is connected to the tube body, and the second connecting part is connected to the inner tube. The second deformable part is located on the inner side compared to the first deformable part, and the deformation resistance of the first deformable part is greater than that of the second deformable part.

9. An endoscope assembly, characterized in that, It includes an endoscope and a sheath as described in any one of claims 1 to 8, wherein the insertion portion of the endoscope passes through the sheath.

10. An endoscope assembly according to claim 9, characterized in that, The insertion part is provided with a first flow channel, and the gap between the insertion part and the tube body is a second flow channel.

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