Guide tube sheath and endoscope assembly

Abstract

The guiding tube sheath comprises a multi-cavity tube and a handle, the multi-cavity tube comprises an outer tube and a plurality of inner tubes parallelly arranged in the outer tube in a penetrating mode, the tube wall of the outer tube is provided with a first positioning structure, the handle is provided with an insertion channel used for allowing the multi-cavity tube to be inserted in, and a second positioning structure is arranged in the insertion channel; the second positioning structure and the first positioning structure are connected in a matched mode in the radial direction of the multi-cavity tube so as to fix the handle and the multi-cavity tube. Through the cooperation of the first positioning structure and the second positioning structure, accurate positioning and stable fixing between the handle and the multi-cavity tube can be achieved, and the situation that the clinical operation of a guide tube sheath or an endoscope is affected due to the fact that the multi-cavity tube moves or rotates relative to the handle can be prevented; the guide tube sheath can be used for guiding the multi-cavity tube and providing support for improving the structural sealing performance of the multi-cavity tube and the structural sealing performance between the multi-cavity tube and the handle, so that the risk that germs on an endoscope are transmitted to the guide tube sheath is effectively reduced when the guide tube sheath is matched with the endoscope by enhancing the structural stability and sealing performance of the guide tube sheath.

Description

Technical Field

[0001] This application relates to the field of medical device technology, specifically to a guide tube sheath and endoscope assembly. Background Technology

[0002] In clinical medicine, using endoscopes to explore, examine, and treat the body's natural cavities is currently the most commonly used minimally invasive diagnostic and treatment method, causing less damage to patients. Traditional endoscopes need to be reused after sterilization, while disposable endoscopes solve the problems of cross-infection and the need for repeated sterilization associated with traditional endoscopes. However, disposable endoscopes are more expensive, which is one of the important factors limiting their rapid development and widespread application.

[0003] In light of this, some alternative solutions exist that use disposable guide sheaths in conjunction with endoscopes to replace disposable endoscopes. For example, the portion of the disposable guide sheath inserted into the body is a closed design, with a lens sealed at the distal end, while the distal end of the endoscope tube has a viewing window that allows light to pass through. After the endoscope tube is inserted into the guide sheath, it does not come into contact with the body. After the surgery is completed, the guide sheath is discarded, while the endoscope can be reused. This reduces the requirements for endoscope sterilization and also lowers costs.

[0004] However, when using disposable guide tube sheaths with endoscopes, the endoscopes are reusable, making it easy for pathogens on the endoscopes to be transferred to the guide tube sheaths during operation, increasing the risk of infection for patients. Utility Model Content

[0005] The main technical problem addressed by this application is to provide a guide tube sheath and an endoscope assembly using the guide tube sheath, which can enhance the structural stability of the guide tube sheath.

[0006] According to a first aspect, one embodiment provides a guide tube sheath, comprising:

[0007] A multi-lumen tube includes an outer tube and multiple inner tubes, with the multiple inner tubes being inserted in parallel and fixed inside the outer tube, and the outer tube having a first positioning structure on its wall.

[0008] A handle having an insertion channel for inserting the multi-lumen tube, the insertion channel having a second positioning structure; the second positioning structure and the first positioning structure are radially engaged and connected to the multi-lumen tube to position and fix the handle and the multi-lumen tube; and

[0009] A seal is located on one or both sides of the second positioning structure along the axial direction of the multi-cavity tube, and the seal is clamped between the multi-cavity tube and the handle to provide a seal.

[0010] In one embodiment, the first positioning structure includes a positioning hole that penetrates the wall of the outer tube, and the second positioning structure includes a positioning boss that protrudes from the wall of the insertion channel; the positioning boss can be inserted into the positioning hole to position and fix the handle and the multi-cavity tube.

[0011] In one embodiment, an inter-pipe channel is formed between the outer tube and the inner tube, communicating with the positioning hole; the positioning boss extends from the positioning hole into the inter-pipe channel to form a sealant-accepting gap between the positioning boss, the outer tube, and the inner tube; the sealant-accepting gap is used to retain sealant so that the sealant seals and blocks the inter-pipe channel.

[0012] In one embodiment, the outer tube wall is further provided with a through-hole for injecting sealant at a portion outside the insertion channel; the through-hole communicates with the inter-tube channel to allow the sealant to enter the inter-tube channel, thereby sealing and blocking the inter-tube channel when the sealant is retained in the sealant gap.

[0013] In one embodiment, the positioning boss extends radially along the multi-cavity tube toward the gap between two adjacent inner tubes.

[0014] In one embodiment, the portion of the positioning boss located within the inter-tube channel is defined as a sealing portion; in the radial direction of the multi-cavity tube, the cross-sectional width of the sealing portion near the positioning hole is greater than the cross-sectional width away from the positioning hole.

[0015] In one embodiment, the sealing portion has a first profile line and a second profile line connected to both ends of the first profile line in the radial cross-section of the multi-cavity tube; wherein the first profile line is an arc segment or curve segment recessed toward the side where the positioning hole is located, and / or the second profile line is an arc segment or curve segment recessed toward the side where the inner tube is located.

[0016] In one embodiment, the positioning hole is located on the wall of the outer tube opposite to the gap between two adjacent inner tubes.

[0017] In one embodiment, the handle includes a left handle shell and a right handle shell; the left handle shell and the right handle shell are radially opposite and connected to the multi-cavity tube to form the insertion channel; wherein, the sealing element is sleeved on the outer tube and clamped between the outer tube and the left handle shell and the right handle shell; the left handle shell and / or the right handle shell are provided with the second positioning structure.

[0018] According to a second aspect, one embodiment provides an endoscope assembly including a cooperating endoscope and a guide tube sheath, the guide tube sheath being the guide tube sheath described in the first aspect.

[0019] The guide tube sheath according to the above embodiment includes a multi-lumen tube and a handle. The multi-lumen tube includes an outer tube and multiple inner tubes inserted in parallel within the outer tube. The wall of the outer tube is provided with a first positioning structure. The handle has an insertion channel for inserting the multi-lumen tube, and a second positioning structure is provided within the insertion channel. The second positioning structure and the first positioning structure are radially connected to each other along the multi-lumen tube to fix the handle and the multi-lumen tube. By utilizing the cooperation of the first positioning structure and the second positioning structure, precise positioning and stable fixation between the handle and the multi-lumen tube can be achieved. This not only prevents the clinical operation of the guide tube sheath or endoscope from being affected by the movement or rotation of the multi-lumen tube relative to the handle, but also provides support for improving the structural seal of the multi-lumen tube itself and its connection with the handle. By enhancing the structural stability and sealing of the guide tube sheath, the risk of pathogens on the endoscope being transferred to the guide tube sheath is effectively reduced when the guide tube sheath is used with the endoscope. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structural assembly of a guide tube sheath according to one embodiment.

[0021] Figure 2 This is an exploded view of the guide tube sheath in one embodiment.

[0022] Figure 3 This is a schematic diagram of the positioning structure of the multi-lumen tube and the handle in a guide tube sheath according to one embodiment.

[0023] Figure 4 This is a schematic diagram of the cross-sectional profile of a positioning protrusion in a guide tube sheath according to one embodiment.

[0024] Figure 5 This is a schematic diagram of the cross-sectional profile of a multi-lumen tube in a guide tube sheath according to one embodiment.

[0025] Figure 6 This is a schematic diagram of the flow path of the sealant in the guide tube sheath according to one embodiment.

[0026] In the picture:

[0027] 10. Multi-lumen tube; 10a. Inter-tube channel; 10b. Adhesive gap; 11. Outer tube; 12. Inner tube; 13. Positioning hole; 14. Adhesive injection hole; 20. Handle; 21. Left shell of the handle; 22. Right shell of the handle; 23. Positioning boss. Detailed Implementation

[0028] The present application 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.

[0029] 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.

[0030] 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. Unless otherwise specified, the terms "connection" and "linkage" used in this application include both direct and indirect connections (linkages).

[0031] In some existing disposable guide tube sheaths, the handle and the multi-lumen tube are typically sealed radially with a sealing ring, and anti-rotation positioning is achieved through the non-circular structural fit between the handle and the multi-lumen tube. During actual use, under excessive external force, the handle and the multi-lumen tube can easily rotate relative to each other or move axially back and forth. This can lead to problems such as leakage due to poor sealing of the guide tube sheath and interference with endoscopic clinical operations due to rotation of the multi-lumen tube. Since endoscopes are reusable, if the guide tube sheath leaks or the multi-lumen tube rotates during clinical operations, bacteria on the endoscope can easily be transferred to the guide tube sheath, significantly increasing the risk of patient infection.

[0032] The guide tube sheath provided in this application, through a first positioning structure set on the outer tube of the multi-lumen tube and a second positioning structure set inside the handle, can achieve precise positioning and fixation of the handle and the multi-lumen tube by means of the radial connection between the first positioning structure and the second positioning structure. This can effectively avoid problems such as axial relative movement and relative rotation between the handle and the multi-lumen tube, thereby improving the structural stability and reliability of the guide tube sheath.

[0033] Please see Figures 1 to 6 This application provides a guide tube sheath, such as a disposable guide tube sheath used in conjunction with an endoscope; the guide tube sheath includes a multi-lumen tube 10, a handle 20, a seal (not shown in the figure), and other functional components as needed, which are described in detail below.

[0034] Please see Figures 2 to 5 The multi-cavity tube 10 includes an outer tube 11 and an inner tube 12; the number of inner tubes 12 is set to multiple, such as two, three or more; multiple inner tubes 12 are inserted in parallel and fixed inside the outer tube 11; for example, the inner tubes 12 are fixed inside the outer tube 11 by means of thermal fusion such as laser welding or bonding to form the multi-cavity tube 10; or, for example, the multi-cavity tube 10 adopts an integral structure (such as integral injection molding).

[0035] Please see Figure 1 and Figure 2 The handle 20 is located at the proximal end of the multi-lumen tube 10 and has an insertion channel that allows the proximal end of the multi-lumen tube 10 to be inserted. A seal is disposed within the insertion channel and clamped between the multi-lumen tube 10 (specifically, the outer tube 11) and the handle 20. For example, the seal may include a sealing ring fitted around the outer tube 11. When the multi-lumen tube 10 is inserted into the insertion channel, the sealing ring is clamped and fixed between the outer surface of the outer tube 11 and the channel wall of the insertion channel. In this way, the handle 20 and the multi-lumen tube 10 are radially sealed by the seal, eliminating the structural gap between them.

[0036] In some embodiments, please refer to Figure 2 The outer tube 11 has a first positioning structure on its wall and the handle 20 has a second positioning structure inside (specifically, in the insertion channel). When the multi-cavity tube 10 is inserted into the insertion channel, the first positioning structure and the second positioning structure are aligned and connected along the radial direction of the multi-cavity tube 10 to achieve positioning and fixing of the multi-cavity tube 10 and the handle 20.

[0037] For example, please refer to Figures 2 to 5 The first positioning structure includes a positioning hole 13, and the second positioning structure includes a positioning boss 23. The positioning hole 13 penetrates the wall of the outer tube 11, and the positioning boss 23 protrudes from the wall of the insertion channel. Based on the parallel arrangement of multiple inner tubes 12 within the outer tube 11, a gap channel with a certain volume, communicating with the positioning hole 13, can be formed inside the multi-cavity tube 10 (i.e., between the outer tube 11 and the inner tubes 12). For ease of distinction and description, this gap channel is defined as the inter-tube channel 10a. When the multi-cavity tube 10 is inserted into the insertion channel, the positioning boss 23 passes radially through the positioning hole 13 and extends into the inter-tube channel 10a.

[0038] By utilizing the positioning boss 23, which is inserted into the outer tube 11 through the positioning hole 13, precise positioning and fixed connection between the multi-lumen tube 10 and the handle 20 are achieved. This prevents the multi-lumen tube 10 from moving relative to the handle 20 along its axis and also prevents the multi-lumen tube 10 from rotating relative to the handle 20. This effectively improves the stability and reliability of the guide tube sheath structure, avoids affecting the clinical operation of the endoscope (or guide tube sheath) due to the movement or rotation of the multi-lumen tube 10 relative to the handle 20, and provides support for ensuring or improving the sealing between the multi-lumen tube 10 and the handle 20.

[0039] Meanwhile, by utilizing the structure of the positioning boss 23 extending into the inter-pipe channel 10a, the size of the inter-pipe channel 10a corresponding to the positioning boss 23 can be reduced, or the shape of the inter-pipe channel 10a corresponding to the positioning boss 23 can be changed, thereby forming a sealant gap 10b between the positioning boss 23, the outer tube 11, and the inner tube 12. By injecting sealant into the inter-pipe channel 10a, when the sealant flows to the sealant gap 10b, it will be retained in the sealant gap 10b due to the liquid tension. After the sealant cures, the sealant gap 10b can be sealed, which is equivalent to sealing and blocking the inter-pipe channel 10a at the junction of the multi-cavity tube 10 and the handle 20 (i.e., the positioning boss 23), thus completing the sealing of the gap between the outer tube 11, the inner tube 12, and the positioning boss 23.

[0040] The cured sealant can form a stable anti-rotation sealing structure between the inner tube 12 and the outer tube 11, as well as between the multi-lumen tube 10 and the handle 20, further improving the overall sealing performance of the guide tube sheath. It can also be used as a water injection channel for the guide tube sheath (for example, water can be injected into the water injection channel from the part of the outer tube 11 near the handle 20, and the water injection channel can then guide the water to flow out of the multi-lumen tube 10 from the distal end of the outer tube 12). In this way, when the guide tube sheath is used with the endoscope, the endoscope and the water injection channel can be isolated, thereby effectively reducing the risk of pathogens on the endoscope being transmitted to the guide tube sheath.

[0041] In addition, the gap between the positioning boss 23, the outer tube 11 and the inner tube 12 is sealed and fixed by the sealant. This not only enhances the stability of the structural connection between the handle 20 and the multi-cavity tube 10, but also forms a seal between the structural gaps of the relevant components in conjunction with the sealing element. This reduces the requirements for the fitting accuracy between the relevant components and improves the sealing performance of the guide tube sheath.

[0042] In some embodiments, the first and second positioning structures can also employ other suitable mating structures; for example, the positioning boss 23 is inserted into the positioning hole 13, and the positioning boss 23 is sealed and fixed to the outer tube 11 by sealant or the like; another example is that the first positioning structure includes a groove structure provided on the wall of the outer tube 11, and the positioning boss 23 is aligned and inserted into the groove structure; yet another example is that the first positioning structure includes a protrusion structure protruding from the wall of the outer tube 11, and the second positioning structure is a groove or through hole structure provided on the handle 10, and the protrusion structure is aligned and inserted into the second positioning structure. All of these methods can achieve precise positioning and fixed connection between the multi-cavity tube 10 and the handle 20, thereby improving the structural stability and sealing of the guide tube sheath; therefore, further details are omitted here.

[0043] In some embodiments, please refer to Figure 2 and Figure 6 The outer tube 11 also has a through-hole 14 for connecting the inter-tube channel 10a. The through-hole 14 is located outside the insertion channel in the wall of the outer tube 11. Based on the cooperation between the positioning boss 23 and the positioning hole 13, after the assembly of the multi-cavity tube 10, handle 20 and seal is completed, sealant can be injected into the inter-tube channel 10a from the outside of the guide tube sheath through the through-hole 14. When the sealant flows into the inter-tube channel 10a to the sealant gap 10b, it is stuck due to the liquid tension. After the sealant in the sealant gap 10b is cured, it achieves the sealing and blocking of the inter-tube channel 10a (i.e., sealing and closing the gap between the outer tube 11, inner tube 12 and positioning boss 23). This can effectively reduce the difficulty of assembling and sealing the guide tube sheath and facilitate the precise control of the amount of sealant used.

[0044] It should be noted that, Figure 6 The bold solid line with an arrow indicates the approximate flow path of the sealant within the inter-pipe channel 10a.

[0045] In some embodiments, please refer to Figures 3 to 5 The positioning hole 13 is located on the wall of the outer tube 11, opposite to the gap between the two adjacent inner tubes 12; for details, please refer to... Figure 5 Since multiple inner tubes 12 are inserted in parallel inside the outer tube 11, when viewed from the axial direction of the multi-cavity tube 10, an approximately wedge-shaped gap is formed between the outer tube 11 and each of the two adjacent inner tubes 12. The multiple gaps are interconnected to form the cross-sectional shape of the inter-tube channel 10a. The positioning hole 13 is opposite to the gap formed between the two adjacent inner tubes 12 in the radial direction of the multi-cavity tube 10.

[0046] Please see Figure 3 and Figure 4After the positioning boss 23 passes through the positioning hole 13 and enters the inter-tube channel 10a, it will be in a corresponding blank gap. In this way, the positioning boss 23 can cooperate with the outer tube 11 and the inner tube 12 to form a sealant gap 10b in the blank gap. When the sealant flows in the inter-tube channel 10a, it can be retained at the sealant gap 10b due to the liquid tension. Thus, after the sealant cures, the gap between the positioning boss 23, the outer tube 11 and the inner tube 12 is sealed. At the same time, it can also prevent the positioning boss 23 from pressing against the inner tube 12, and prevent the structural deformation of the inner tube 12 from affecting the clinical operation of the endoscope or related instruments.

[0047] In some embodiments, please refer to Figure 3 and Figure 4 The positioning boss 23 extends radially along the multi-cavity tube 10 toward the gap between two adjacent inner tubes 12. Specifically, after the positioning boss 23 passes through the positioning hole 13 and extends into the inter-tube channel 10a (specifically as the wedge-shaped blank gap mentioned above), it extends a certain distance toward the gap between two adjacent inner tubes 12.

[0048] In this way, by extending the positioning boss 23 into the gap between two adjacent inner tubes 12, a smaller size or smaller volume of sealant gap 10b can be formed. This is beneficial for precise control of the amount of sealant used, and also for the sealant to be retained due to more significant liquid tension when it flows to the sealant gap 10a.

[0049] In some embodiments, please refer to Figure 3 and Figure 4 The portion of the positioning boss 23 located within the inter-pipe channel 10a is defined as the sealing portion. The cross-sectional dimensions of this sealing portion in the radial direction of the multi-cavity tube 10 are set such that the width of the cross-section near the positioning hole 13 is greater than the width of the cross-section away from the positioning hole 13. Based on the dimensional constraints of the sealing portion, the structural strength of the positioning boss 23 itself can be enhanced, and the shape of the structural gaps between the multiple inner tubes 12 and between the inner tube and the outer tube 11 can be accommodated, so that the sealant can be better retained in the sealant gap 10b.

[0050] For example, please refer to Figure 4 The sealing part has a first contour line 23a and a second contour line 23b connected to both ends of the first contour line 23a in the radial direction of the multi-cavity tube 10; wherein, the first contour line 23a is an arc segment or curve segment recessed toward the side where the positioning hole 13 is located, and the second contour line 23b is an arc segment or curve segment recessed toward the side where the corresponding inner tube 12 is located.

[0051] By restricting the contour shape of the sealing part, while ensuring that the cross-sectional dimensions of the sealing part gradually decrease smoothly from the end near the positioning hole 13 to the end away from the positioning hole 13, the contour surface of the sealing part can also be adapted to the circumferential curvature of the inner tube 12. This allows the sealant to be retained more and better in the sealant gap 10b under the action of liquid tension, enhancing the stability of the connection between the positioning boss 23, the inner tube 12, and the outer tube 11, as well as the blocking and sealing effect on the inter-tube channel 10a.

[0052] Of course, the outline shape (i.e. the cross-sectional shape) of the sealing part can also be set to other shapes, such as the first outline 23a or the second outline 23b being straight segments; as long as it can reduce the size of the inter-pipe channel 10a, facilitate the retention of sealant, and avoid pressing the inner tube 12, etc.

[0053] In some embodiments, the number of both the first positioning structure and the second positioning structure is set to be multiple, and the multiple first positioning structures correspond one-to-one with the multiple second positioning structures; wherein, the multiple first positioning structures are evenly spaced around the center line of the outer tube 11.

[0054] For example, please refer to Figure 3 and Figure 4 Two inner tubes 12 are inserted parallel to each other inside the outer tube 11. The outer peripheral surfaces of the two inner tubes 12, which are radially separated from each other in the multi-cavity tube 10, are respectively fitted and fixed to the inner peripheral surfaces of the corresponding outer tubes 11. The cross-sectional profile of the outer tube 11 or the multi-cavity tube 10 is approximately an ellipse that corresponds to the arrangement of the two inner tubes 12. The outer tube 11 has positioning holes 13 through the tube walls on both sides of the ellipse along the minor axis. Correspondingly, a positioning boss 23 is provided inside the handle 20 at the position corresponding to each positioning hole 13.

[0055] Thus, by utilizing the one-to-one correspondence between multiple first positioning structures and multiple second positioning structures, and the structural form of evenly arranged around the outer tube 11, the balance of force between the handle 20 and the multi-cavity tube 10 can be effectively enhanced. This not only allows the sealant to be firmly and evenly clamped between the handle 20 and the multi-cavity tube 10, but also improves the stability of the structural connection between the handle 20 and the multi-cavity tube 10. At the same time, by using multiple positioning bosses 23, smaller and more suitable sealant-retaining gaps 10b can be formed in the inter-tube channel 10a, enhancing the structural connection strength between the positioning bosses 23, the outer tube 11, and the inner tube 12, as well as the sealing effect of the structural gaps.

[0056] In some embodiments, please refer to Figures 2 to 4The handle 20 includes a left handle shell 21 and a right handle shell 22; wherein the left handle shell 21 and the right handle shell 22 are opposite to each other in the radial direction of the multi-cavity tube 10 and connected (e.g., snap-fit, fasten, adhesive, etc.) to form an insertion channel between the distal ends of the left handle shell 21 and the right handle shell 22; the sealing element is sleeved on the periphery of the outer tube 11 and clamped between the outer tube 11 and the left handle shell 21 and the right handle shell 22; and the second positioning structure is provided in one or both of the left handle shell 21 and the right handle shell 22.

[0057] For example, the cross-sectional profile of the multi-cavity tube 10 is approximately elliptical, and the positioning holes 13 are provided on both sides of the outer tube 11 in the direction of the minor axis of the ellipse. The left handle shell 21 and the right handle shell 22 are respectively provided with positioning bosses 23 that match the positioning holes 13.

[0058] Therefore, the combination of the left handle shell 21 and the right handle shell 22 to form the handle 22 provides support for the convenient and quick assembly of the guide tube sheath. For example, the proximal end of the multi-lumen tube 10 with the sealing element can be first inserted into the left handle shell 21, so that the positioning boss 23 of the left handle shell 21 is inserted into the positioning hole 13; then the positioning boss 23 of the right handle shell 22 is inserted into the corresponding positioning hole 13, thereby completing the combination of the handle 20 and the multi-lumen tube 10; subsequently, the left handle shell 21, the right handle shell 22, and the multi-lumen tube 10 are fixed by means of thermal fusion such as laser welding, physical bonding such as adhesive, or chemical bonding. Finally, sealant is injected into the inter-tube channel 10a, and after the sealant is retained and cured at the sealant gap 10b, the assembly of the guide tube sheath is completed.

[0059] In other embodiments, the handle 20 may also adopt other suitable structures, and the cross-sectional shape of the multi-cavity tube 20 may also adopt other shapes based on differences in the number and diameter of the inner tubes 12, such as a circle. As long as the positioning, fixing and sealing between the handle 20 and the multi-cavity tube 10 can be achieved through the cooperation of the first positioning structure and the second positioning structure, all other aspects will not be elaborated here.

[0060] Please combine Figures 1 to 5 This application also provides an endoscope assembly, including an endoscope for use and a guide tube sheath of any of the foregoing embodiments; wherein the endoscope includes an endoscope handle, a tube for inserting the guide tube sheath, a lens at the distal end of the tube, and other functional components as needed.

[0061] For example, please combine Figure 5The multi-lumen tube 10 in the guide tube sheath has two inner tubes 12, and the distal end of the outer tube 11 is provided with a lens mount assembly that restricts and fixes the distal end of the inner tube 12 within the outer tube 11. For ease of distinction and description, the two inner tubes 12 are defined as the first inner tube and the second inner tube, respectively. The distal end of the first inner tube is closed by the lens mount assembly, while the distal end of the second inner tube is connected to the outside through the lens mount assembly.

[0062] When the guide tube sheath is used, the endoscope tube can be inserted into the first inner tube, and the endoscope lens can be placed against the light-transmitting lens (such as a transparent glass plate) in the lens holder assembly. This allows the endoscope to image the area to be examined inside the body. Other auxiliary treatment instruments can extend from the distal end of the second inner tube from the lens holder assembly for diagnosis and treatment of the examined area. Simultaneously, the inter-tube channel 10a inside the multi-lumen tube 10 can be used as a separate water injection channel from the endoscope and other components. Since the endoscope assembly possesses the same technical effects as the guide tube sheath described above, further details are omitted here.

[0063] It should be noted that the proximal and distal ends in this application are based on their distance from the operator during use. For example, the distal end of the multi-lumen tube 10 is the end that is inserted into the human body and is away from the handle 20, while the proximal end is the end that is close to the handle 20. Similarly, the distal end of the endoscope is the end where the endoscope lens is located, while the proximal end is the end that is away from the endoscope lens and close to the endoscope handle. Here, "end" refers to the area at the end of a component, which can be understood as an area with a certain length at the end, and is not limited to the end face.

[0064] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. A guide tube sheath, characterized in that, include: A multi-lumen tube includes an outer tube and multiple inner tubes, with the multiple inner tubes being inserted in parallel and fixed inside the outer tube, and the outer tube having a first positioning structure on its wall. The handle has an insertion channel for inserting the multi-lumen tube, and the insertion channel is provided with a second positioning structure; the second positioning structure and the first positioning structure are radially connected to the multi-lumen tube to position and fix the handle and the multi-lumen tube. as well as A seal is located on one or both sides of the second positioning structure along the axial direction of the multi-cavity tube, and the seal is clamped between the multi-cavity tube and the handle to provide a seal.

2. The guide tube sheath as described in claim 1, characterized in that, The first positioning structure includes a positioning hole that penetrates the wall of the outer tube. The second positioning structure includes a positioning boss that protrudes from the wall of the insertion channel. The positioning boss can be inserted into the positioning hole to position and fix the handle and the multi-cavity tube.

3. The guide tube sheath as described in claim 2, characterized in that, An inter-pipe channel is formed between the outer tube and the inner tube, communicating with the positioning hole; the positioning boss extends from the positioning hole into the inter-pipe channel to form a sealant-accommodating gap between the positioning boss, the outer tube, and the inner tube; the sealant-accommodating gap is used to accommodate sealant so that the sealant seals and blocks the inter-pipe channel.

4. The guide tube sheath as described in claim 3, characterized in that, The outer tube has a through-hole for injecting sealant in the part of its wall outside the insertion channel; the through-hole communicates with the inter-tube channel to allow the sealant to enter the inter-tube channel, so as to seal and block the inter-tube channel when the sealant is retained in the sealant gap.

5. The guide tube sheath as described in claim 3, characterized in that, The positioning boss extends radially along the multi-cavity tube toward the gap between two adjacent inner tubes.

6. The guide tube sheath as described in claim 3, characterized in that, The portion of the positioning boss located within the inter-pipe channel is defined as the sealing portion; in the radial direction of the multi-cavity pipe, the cross-sectional width of the sealing portion near the positioning hole is greater than the cross-sectional width away from the positioning hole.

7. The guide tube sheath as described in claim 6, characterized in that, The sealing portion has a first contour line and a second contour line connected to both ends of the first contour line in the radial cross-section of the multi-cavity tube; wherein the first contour line is an arc segment or curve segment recessed toward the side where the positioning hole is located, and / or the second contour line is an arc segment or curve segment recessed toward the side where the inner tube is located.

8. The guide tube sheath as described in claim 2, characterized in that, The positioning hole is located on the wall of the outer tube, opposite to the gap between the two adjacent inner tubes.

9. The guide tube sheath as described in any one of claims 1-8, characterized in that, The handle includes a left handle shell and a right handle shell; the left handle shell and the right handle shell are opposite to and connected in the radial direction of the multi-cavity tube to form the insertion channel; wherein, the sealing element is sleeved on the outer tube and clamped between the outer tube and the left handle shell and the right handle shell; the left handle shell and / or the right handle shell are provided with the second positioning structure.

10. An endoscope assembly, characterized in that, It includes an endoscope and a guide tube sheath used in conjunction, wherein the guide tube sheath is the guide tube sheath according to any one of claims 1-9.

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