Guide tube sheath for endoscope and endoscope assembly

Abstract

The application provides a guide tube sheath and an endoscope assembly. The guide tube sheath comprises a tube body assembly and an external water injection assembly. The external water injection assembly is directly and sealingly sleeved on the tube body assembly and covers a water inlet of the tube body assembly. The external water injection assembly has a through external water injection channel which is in communication with the water inlet and is used for introducing an external water source into the water inlet. The water injection structure is simple, easy to assemble and low in processing difficulty, and can greatly reduce the assembly cost.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to the structure of a guide tube sheath. Background Technology

[0002] In clinical medicine, endoscopic examination and treatment are currently the most commonly used minimally invasive diagnostic and treatment methods, causing minimal damage to patients. Endoscopes are widely used for exploring and treating natural cavities in the human body. Traditional endoscopes are typically reused after sterilization. Disposable endoscopes can solve the problems of cross-infection and repeated sterilization of reused endoscopes. However, disposable electronic endoscopes are relatively expensive, which is one of the important factors restricting their rapid development and widespread use.

[0003] To address the need for repeated sterilization and disinfection, reduce costs, and further minimize the outer diameter of endoscopes, a design is now being developed that uses a guide tube sheath instead of a disposable endoscope. The guide tube sheath has a closed design for insertion into the body. Once inserted into the guide tube sheath, the endoscope tube does not come into contact with the body. After the surgery, the guide tube sheath is discarded, while the endoscope can be reused. This reduces the need for repeated sterilization and disinfection of the endoscope, thus lowering costs.

[0004] Since endoscopes are often used for flushing and other purposes, some guide tube sheaths are equipped with water injection channels and connectors. However, the water injection connectors and guide tube sheath components are usually fixedly connected by welding or other methods, which is difficult to process and has high manufacturing costs. Utility Model Content

[0005] One of the purposes of this invention is to provide a guide tube sheath for endoscopes, which enables the assembly of an external water injection component and a tube body component within the guide tube sheath.

[0006] In addition, one of the objectives of this invention is to provide an endoscope assembly that uses the guide tube sheath.

[0007] To achieve one of the above objectives, some embodiments of this application provide a guide sheath for an endoscope, comprising:

[0008] A handle portion for the operator to grip, the handle portion having a cavity;

[0009] The tube assembly has at least an endoscope insertion channel and a water injection channel. The tube assembly is connected to the handle portion. The endoscope insertion channel communicates with the cavity for inserting the endoscope. The water inlet of the water injection channel is located on the side wall of the tube assembly, and the water outlet of the water injection channel is located at the front end of the tube assembly.

[0010] The external water injection component is sealed and fitted onto the pipe body assembly and covers the water inlet. The external water injection component has a through external water injection channel that is connected to the water inlet to introduce an external water source into the water inlet.

[0011] In some embodiments, the external water injection assembly includes a water injection connector and a water injection seal. The water injection seal is sealed and fitted onto the pipe assembly and covers the water inlet. The water injection connector is sealed and fitted onto the water injection seal. The external water injection channel includes an external channel provided on the water injection connector and a transfer water injection cavity formed by the water injection connector and the water injection seal. The external channel communicates with the transfer water injection cavity. The water injection seal has a transition hole, and the transfer water injection cavity communicates with the water inlet through the transition hole.

[0012] In some embodiments, the water injection seal has a first sealing portion, a recessed portion, and a second sealing portion arranged along its axial direction. The first sealing portion and the second sealing portion respectively form a seal with the water injection connector. The outer wall of the recessed portion is recessed inward relative to the first sealing portion and the second sealing portion to form an annular transfer water injection cavity arranged around the pipe body assembly. The transfer hole is provided on the recessed portion.

[0013] In some embodiments, there are at least two water injection channels, with the inlets of each channel distributed at different positions around the circumference of the pipe assembly. The recess has at least two connecting holes, each of which is connected to a corresponding inlet. Water from the external channel can flow into the corresponding water injection channel through different paths from different inlets.

[0014] In some embodiments, there are two water injection channels, with the inlets of the two water injection channels symmetrically distributed around the circumference of the pipe assembly; there are two adapter holes, which are symmetrically distributed around the circumference of the recess.

[0015] In some embodiments, the water injection connector further has a through-connected transition cavity, the pipe assembly passes through the transition cavity, the water injection seal is placed inside the transition cavity, and the first sealing part and the second sealing part are sealed and connected to the cavity wall of the transition cavity; the external channel communicates with the transition cavity.

[0016] In some embodiments, the tube assembly includes an outer tube and at least one inner tube, wherein the at least one inner tube has the endoscope insertion channel, the inner tube is disposed inside the outer tube, the space between the outer tube and the inner tube forms the water injection channel, and the water inlet is disposed on the outer tube.

[0017] In some embodiments, the water-filled seal is a deformable flexible material, wherein:

[0018] The water injection connector is tightly sealed with the first sealing part and the second sealing part;

[0019] And / or, the first sealing part and the second sealing part are tightly fitted and sealed with the tube body assembly.

[0020] In some embodiments, the handle portion has a first snap-fit ​​portion, and the water inlet connector has a second snap-fit ​​portion at the end opposite to the handle portion. After the water inlet connector is installed in the pipe body assembly, the first snap-fit ​​portion and the second snap-fit ​​portion are snapped together and fixed.

[0021] In some embodiments, the first snap-fit ​​portion is a first buckle, the second snap-fit ​​portion has a second buckle and a U-shaped groove surrounding the second buckle, the water inlet connector is sleeved on one end of the handle portion, the first buckle protrudes outward from the U-shaped groove and snaps into the second buckle.

[0022] In some embodiments, the guide tube sheath is a disposable guide tube sheath.

[0023] For one of the above objectives, some embodiments of this application provide an endoscope assembly including an endoscope and a sheath as described in any of the preceding claims, the endoscope being insertable into an endoscope insertion channel of the guide sheath.

[0024] According to the above embodiment, the guide tube sheath includes a tube body assembly and an external water injection assembly. The external water injection assembly can be directly and sealed onto the tube body assembly by a sleeve connection, covering the water inlet of the tube body assembly. The external water injection assembly has a through external water injection channel, which communicates with the water inlet to introduce an external water source into the water inlet. This water injection structure is simple, easy to assemble, and has low processing difficulty, which can greatly reduce assembly costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the guide tube sheath in one embodiment of this application;

[0026] Figure 2 This is an exploded view of the pipe assembly, water inlet connector, and water inlet seal in one embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the assembly of the water injection connector and the water injection seal on the pipe body assembly in one embodiment of this application. At this time, the water injection seal is installed on the pipe body assembly, but the water injection connector has not yet been installed in the set position.

[0028] Figure 4This is a cross-sectional view along the axial direction of the tube assembly in one embodiment of this application;

[0029] Figure 5 This is a cross-sectional view taken along the axis perpendicular to the tube assembly in one embodiment of this application. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0031] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0032] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0033] This application provides a guide tube sheath for an endoscope, which achieves the assembly of the external water injection component and the tube body component in the guide tube sheath with a simpler structure and assembly method.

[0034] Please refer to Figures 1-5 In some embodiments of this application, a guide sheath 1 for an endoscope is provided. This guide sheath 1 can be used for endoscope insertion, so as to protect the endoscope when it is inserted into the patient's body, avoiding cross-infection and other problems caused by repeated use of the endoscope. Figures 1-5 In the illustrated embodiment, the guide tube sheath 1 is typically a disposable guide tube sheath. Of course, in other embodiments, the guide tube sheath 1 can also be used in a reusable guide tube sheath structure.

[0035] Please refer to Figure 1 and 2 In some embodiments, the guide tube sheath 1 includes a handle portion 100, a tube body assembly 200, and an external water injection assembly 300. Of course, when other functions are required, the guide tube sheath 1 may also have other related components, as can be found in the prior art.

[0036] Please refer to Figure 4 The handle 100 is for the operator to grip. The tube assembly 200 and the handle 100 are connected, but not limited to, by snap-fit, adhesive, welding, threaded connection, etc. The tube assembly 200 has at least a water injection channel 201 (see...). Figure 5 ) and endoscope insertion channel 202 (see Figure 5 In some embodiments, the inlet 2011 of the water injection channel 201 is located on the side wall of the pipe assembly 200 (see...). Figure 2 and 4 The outlet 2012 of the water injection channel 201 is located at the front end of the pipe assembly 200 (see...). Figure 1 The handle portion 100 has a cavity, and the endoscope insertion channel 202 communicates with the cavity for inserting the endoscope from the rear end of the guide tube sheath 1 (the end away from the examinee, also known as the proximal end) and extending to the front end of the guide tube sheath 1 (the end inserted into the examinee, also known as the distal end).

[0037] Of course, in other embodiments, other functional channels may also be included, such as instrument channel 203, gas detection channel (not shown in the figure), etc. The tube assembly 200 may be composed of multiple tubes, each forming a channel, such as a multi-lumen composite tube (e.g., Figure 4 (As shown), in addition, each channel in the tube assembly 200 can also be integrally formed, for example, multiple channels can be formed simultaneously through a tube, and these channels can be used for different purposes.

[0038] Please refer to Figure 2 and 4 The external water injection component 300 is sealed and fitted onto the pipe body assembly 200, covering the water inlet 2011. The external water injection component 300 has a through external water injection channel 301, which communicates with the water inlet 2011 to introduce external water into the water inlet 2011. The seal between the external water injection component 300 and the pipe body assembly 200 can be achieved through compression deformation, adhesive bonding, or other methods.

[0039] The guide sheath 1 shown in the above embodiment has a simple water injection structure. The external water injection component 300 can be directly and sealed onto the pipe body component 200 by a sleeve connection, covering the water inlet 2011 of the pipe body component 200. External water can be delivered to the water inlet 2011 through the external water injection channel 301 on the external water injection component 300. This water injection structure is easy to assemble and has low processing difficulty, which can greatly reduce assembly costs.

[0040] Further, please refer to Figure 2 In some embodiments, the external water injection assembly 300 includes a water injection connector 310 and a water injection seal 320. Please refer to... Figure 4 and 5 The water injection seal 320 is fitted onto the pipe assembly 200 and covers the inlet 2011. The water injection connector 310 is fitted onto the water injection seal 320. Sealing between the water injection seal 320 and the pipe assembly 200, and between the water injection connector 310 and the water injection seal 320, can be achieved through a tight fit caused by material deformation. Alternatively, sealant or other methods can be used. The water injection connector 310 and the water injection seal 320 together form a transfer water injection cavity 330 (see...). Figure 5 The external water injection channel 301 includes an external channel 311 disposed on the water injection connector 310 and a transfer water injection chamber 330 surrounded by the water injection connector 310 and the water injection seal 320. The water injection seal 320 has a transition hole 321 that communicates with the water inlet 2011, for example, the two at least partially overlap to allow for conduction. An external water source can be guided into the external channel 311 through an external pipeline or other means. The external channel 311 communicates with the transfer water injection chamber 330, allowing the introduced water to flow from the transfer water injection chamber 330, through the transition hole 321 and the water inlet 2011 to the water injection channel 201, and out from the water outlet 2012. In this process, the transfer water injection chamber 330 also acts as a buffer to increase water pressure.

[0041] The guide tube sheath 1 shown in the above embodiment has a simple water injection structure. During installation, it can be first... Figure 3 As shown, the water injection seal 320 is fitted onto the pipe assembly 200, and then the water injection connector 310 is fitted onto the water injection seal 320. The entire assembly process is simple, the processing difficulty is low, and the assembly cost can be greatly reduced.

[0042] Of course, in some other embodiments, the external water injection component 300 may omit the water injection seal 320. That is, the external water injection component 300 includes a water injection connector 310, which is directly and sealed on the pipe body component 200, and the external channel 311 of the water injection connector 310 is used to seal and communicate with the water inlet 2011.

[0043] The intermediate water injection cavity 330 between the water injection connector 310 and the water injection seal 320 can have various shapes and structures, as long as it can serve as a transfer and flow guide. Please refer to... Figure 4 and 5 In some embodiments, the water injection seal 320 has a first sealing portion 322, a recessed portion 323, and a second sealing portion 324 arranged along its axial direction. The first sealing portion 322 and the second sealing portion 324 respectively form a seal with the water injection connector 310. The outer wall of the recessed portion 323 is recessed inward relative to the first sealing portion 322 and the second sealing portion 324 to form an annular transfer water injection cavity 330 surrounding the pipe body assembly 200. The transfer hole 321 is provided on the recessed portion 323. This annular transfer water injection cavity 330 can guide the water flow to the circumference of the water injection seal 320, thereby ensuring that the water flow can accurately flow into the transfer hole 321 regardless of where the transfer hole 321 is located in the recessed portion 323, reducing the problem of reduced water flow into the transfer hole 321 due to changes in the position of the transfer hole 321.

[0044] Furthermore, in some embodiments, please refer to Figure 5 The recess 323 has a generally annular outer wall, which facilitates water flow and makes it easier for the water to flow into the transition hole 321. Of course, in other embodiments, the outer wall of the recess 323 may also be other shapes and is not limited to annular.

[0045] Furthermore, in some embodiments, the water injection seal 320 is a deformable flexible material, such as silicone or other materials. Utilizing the elastic deformability of this flexible material, the water injection connector 310 is tightly sealed with the first sealing part 322 and the second sealing part 324; and / or, the first sealing part 322 and the second sealing part 324 are tightly sealed with the pipe assembly 200.

[0046] In addition, please refer to Figure 4 In some embodiments, to enhance the sealing effect between the water injection seal 320 and the water injection connector 310, and between the water injection seal 320 and the pipe assembly 200, more sealing portions can be added axially to the water injection seal 320. For example, a third sealing portion 325 can be provided on the front side of the second sealing portion 324, increasing the number of sealing connections. Of course, the third sealing portion 325 can also be located on the rear side of the first sealing portion 322. Furthermore, the number of third sealing portions 325 can be one or more.

[0047] To enhance the sealing effect between the water injection seal 320 and the pipe assembly 200, the inner walls of the first sealing portion 322, the recessed portion 323, and the second sealing portion 324 can also form an effect similar to the outer wall. That is, the inner wall of the recessed portion 323 is concave relative to the first sealing portion 322 and the second sealing portion 324, thereby making the first sealing portion 322 and the second sealing portion 324 form a raised structure that makes it easier to form a deformation seal with the pipe assembly 200.

[0048] Of course, in this application, "inside and outside" refers to the direction closer to the tube assembly 200 as inside and the direction farther away from the tube assembly 200 as outside.

[0049] In existing structures, a single water injection channel is typically used. However, this method results in a small water flow rate, which is insufficient for scenarios with high water flow requirements. To further increase the water injection capacity of the guide sheath 1, some embodiments are described below. Figure 5 The water injection channel 201 comprises at least two channels, with the inlet 2011 of each channel distributed at different positions circumferentially on the pipe assembly 200. At this time, the recess 323 has at least two connecting holes 321, each connecting hole 321 communicating with a corresponding inlet 2011, such as... Figure 5 As indicated by the arrows, water from the external channel 311 can flow into the corresponding water injection channel 201 through different inlets 2011 via different paths. Thanks to the design of the annular transfer water injection chamber 330, when there are two or more water injection channels 201, a diversion effect of the injected water can be achieved. This ensures that water can enter through the transfer holes 321 at various positions around the recess 323 and the inlets 2011 around the pipe assembly 200, guaranteeing sufficient water flow in each water injection channel 201 and thereby increasing the overall water flow rate. Furthermore, this mating structure allows for the introduction of more water simply by changing the outer wall shape of the water injection seal 320, achieving both sealing and a large water flow rate through a simple structure.

[0050] For a more specific embodiment, please refer to Figure 5 In some embodiments, there are two water injection channels 201, with the inlets 2011 of the two channels 201 symmetrically distributed circumferentially on the pipe assembly 200. Correspondingly, there are two connecting holes 321, symmetrically distributed circumferentially on the recess 323. One connecting hole 321 overlaps with one inlet 2011 to form a connection. This symmetrical water delivery structure allows for a more stable water flow. Of course, in other embodiments, there may be more than three water injection channels 201, inlets 2011, and connecting holes 321.

[0051] Further, please refer to Figure 4 and 5In some embodiments, the water injection connector 310 also has a through-type transition cavity 312, which allows the water injection connector 310 to be fitted onto the water injection seal 320 and the pipe assembly 200. The pipe assembly 200 passes through the transition cavity 312, and the water injection seal 320 is placed inside the transition cavity 312. The first sealing part 322 and the second sealing part 324 are sealed and connected to the cavity wall of the transition cavity 312, for example, by compression deformation or adhesive sealing. The external channel 311 of the water injection connector 310 communicates with the transition cavity 312, thereby forming a connected flow channel between the external channel 311, the transition cavity 312, and the intermediate water injection cavity 330.

[0052] The shape of the adapter cavity 312 is not limited, as long as it can be fitted onto the water injection seal 320 and the pipe assembly 200. Please refer to... Figure 5 In some embodiments, the transfer cavity 312 may have a cylindrical cavity that cooperates with the annular concave portion to form an annular intermediate water injection cavity 330, so as to more easily promote the flow of water in the intermediate water injection cavity 330.

[0053] For details regarding the structure of the water injection connector 310, please refer to [link / reference needed]. Figure 2 In some embodiments, the water injection connector 310 has a cylindrical seat 313 and a connecting connector 314. The seat 313 is used to fit over the water injection seal 320 and the pipe assembly 200; for example, an adapter cavity 312 may be provided on the seat 313. The connecting connector 314 may be integrally formed with the seat 313, or it may be manufactured separately and then fixedly connected. The external channel 311 may be provided separately on the connecting connector 314, or it may be formed by the connecting connector 314 and the seat 313 together. In some more specific embodiments, the connecting connector 314 can be used to connect with other pipes, for example, but not limited to, a Luer connector.

[0054] Furthermore, this connector 314 can be either a two-way connector or a three-way connector. Figure 2 In the embodiment shown, the connector is a tee connector, which can be connected to two other connectors in addition to the docking seat 313.

[0055] On the other hand, the external water injection component 300 can be fixed on the pipe body component 200, or on the handle part 100, or simultaneously on the pipe body component 200 and the handle part 100. The fixing method can be, but is not limited to, snap-fit, bonding, welding, threaded connection, etc.

[0056] In some embodiments, the handle portion 100 has a first snap-fit ​​portion, and the water inlet connector 310 has a second snap-fit ​​portion at the end opposite to the handle portion 100. After the water inlet connector 310 is installed in the pipe body assembly 200, the first snap-fit ​​portion and the second snap-fit ​​portion are snapped together and fixed.

[0057] In some embodiments, please refer to Figure 3 The first engaging portion is a first snap-fit ​​110, and the second engaging portion has a second snap-fit ​​315 and a U-shaped groove 316 surrounding the second snap-fit ​​315. The design of the U-shaped groove 316 allows the second snap-fit ​​315 to have elasticity that allows it to deform from the inside out. The water inlet connector 310 is sleeved on one end of the handle portion 100, and the first snap-fit ​​110 protrudes outward from the U-shaped groove 316 and engages with the second snap-fit ​​315. Of course, this embodiment is only an example of one engaging method; in other embodiments, the first and second engaging portions may also employ other methods.

[0058] For more specific details, please refer to Figure 3 In this embodiment, during installation, the water injection seal 320 can be first fitted onto the pipe assembly 200, and then the water injection connector 310 can be installed along... Figure 3 As indicated by the arrow, the clip is fitted onto the water-filling seal 320 and moves toward the handle 100. When the second clip 315 contacts the first clip 110, the first clip 110 can push the second clip 315 outward to deform until the first clip 110 moves into the U-shaped groove 316. At this time, the first clip 110 protrudes outward from the U-shaped groove 316, and the second clip 315 returns to its initial state under the elastic restoring force and forms a snap-fit ​​with the first clip 110 to achieve fixation.

[0059] In addition, please refer to Figure 4 and 5 In some embodiments, the tube assembly 200 includes an outer tube 210 and at least one inner tube 221, 222, wherein at least one inner tube 221 has an endoscope insertion channel 202. These inner tubes 221, 222 are disposed within the outer tube 210, and the space between the outer tube 210 and the inner tubes 221, 222 forms a water injection channel 201. A water inlet 2011 is disposed on the outer tube 210. This structure eliminates the need for an additional inner tube as the water injection channel 201, resulting in a simpler structure. Furthermore, by saving the inner tube used as the water injection channel 201, the space occupied by the inner tube body within the outer tube 210 can be reduced, thus allowing for a larger diameter water injection channel 201.

[0060] This application also provides an endoscope assembly, including an endoscope and a sheath as described above, wherein the endoscope is insertable into an endoscope insertion channel 202 of a guide sheath 1.

[0061] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A guide tube sheath for an endoscope, characterized in that, include: A handle portion for the operator to grip, the handle portion having a cavity; The tube assembly has at least an endoscope insertion channel and a water injection channel. The tube assembly is connected to the handle portion. The endoscope insertion channel communicates with the cavity for inserting the endoscope. The water inlet of the water injection channel is located on the side wall of the tube assembly, and the water outlet of the water injection channel is located at the front end of the tube assembly. The external water injection component is sealed and fitted onto the pipe body assembly and covers the water inlet. The external water injection component has a through external water injection channel that is connected to the water inlet to introduce an external water source into the water inlet.

2. The guide tube sheath according to claim 1, characterized in that, The external water injection assembly includes a water injection connector and a water injection seal. The water injection seal is sealed and fitted onto the pipe assembly and covers the water inlet. The water injection connector is sealed and fitted onto the water injection seal. The external water injection channel includes an external channel provided on the water injection connector and a transfer water injection cavity formed by the water injection connector and the water injection seal. The external channel communicates with the transfer water injection cavity. The water injection seal has a transition hole, and the transfer water injection cavity communicates with the water inlet through the transition hole.

3. The guide tube sheath according to claim 2, characterized in that, The water injection seal has a first sealing portion, a recessed portion, and a second sealing portion arranged along its axial direction. The first sealing portion and the second sealing portion respectively form a seal with the water injection connector. The outer wall of the recessed portion is recessed inward relative to the first sealing portion and the second sealing portion to form an annular transfer water injection cavity arranged around the pipe body assembly. The transfer hole is provided on the recessed portion.

4. The guide tube sheath according to claim 3, characterized in that, The water injection channel has at least two channels, and the inlet of each water injection channel is distributed at different positions on the circumference of the pipe assembly. The recess has at least two connecting holes, and each connecting hole is connected to the corresponding inlet. Water from the external channel can flow into the corresponding water injection channel through different paths from different inlets.

5. The guide tube sheath according to claim 4, characterized in that, There are two water injection channels, and the inlets of the two water injection channels are symmetrically distributed on the circumference of the pipe assembly; there are two adapter holes, which are symmetrically distributed on the circumference of the recess.

6. The guide tube sheath according to claim 3, characterized in that, The water injection connector also has a through-connected transition cavity, the pipe assembly passes through the transition cavity, the water injection seal is placed inside the transition cavity, and the first sealing part and the second sealing part are sealed and connected to the cavity wall of the transition cavity; The external channel is connected to the adapter cavity.

7. The guide tube sheath according to claim 2, characterized in that, The tube assembly includes an outer tube and at least one inner tube, wherein at least one inner tube has the endoscope insertion channel, the inner tube is disposed inside the outer tube, the space between the outer tube and the inner tube forms the water injection channel, and the water inlet is disposed on the outer tube.

8. The guide tube sheath according to claim 3, characterized in that, The guide tube sheath is a disposable guide tube sheath, and the water injection seal is made of a deformable flexible material, wherein: The water injection connector is tightly sealed with the first sealing part and the second sealing part; And / or, the first sealing part and the second sealing part are tightly fitted and sealed with the tube body assembly.

9. The guide tube sheath according to claim 2, characterized in that, The handle portion has a first buckle and a first engaging portion. The water inlet connector has a second buckle and a U-shaped groove surrounding the second buckle at one end opposite to the handle portion. The water inlet connector is sleeved on one end of the handle portion. The first buckle protrudes outward from the U-shaped groove and engages with the second buckle.

10. An endoscope assembly, characterized in that, Includes an endoscope and a sheath as described in any one of claims 1-9, wherein the endoscope is insertable into the endoscope insertion channel of the guide sheath.

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