A sealed structure, negative pressure suction sheath and endoscope assembly

Abstract

The application discloses a sealing structure, a negative pressure suction sheath and an endoscope assembly, and belongs to the technical field of medical devices. The sealing structure is used for the negative pressure suction sheath and comprises a first cover body, which is detachably connected to the proximal end of a sheath base of the negative pressure suction sheath, a middle part of the first cover body is provided with a first through hole, and a first air hole is arranged on the radial outer side of the first through hole; a second cover body is arranged on the outer side of the first cover body and is detachably connected to the sheath base of the negative pressure suction sheath, a middle part of the second cover body is provided with a second through hole, and a second air hole is arranged on the radial outer side of the second through hole; the second cover body and the first cover body are in sliding fit, the overlapping opening degree of the first air hole and the second air hole is adjusted through relative sliding; the second cover body axially limits the first cover body and provides support when the endoscope is inserted, so that the first cover body is prevented from collapsing. The sealing structure in the application is used for the negative pressure suction sheath, avoids the additional occupation of a branch switch to a surgical space, and improves the safety of surgery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a sealing structure, a negative pressure suction sheath and an endoscope assembly. BACKGROUND

[0002] In minimally invasive surgery of urology (such as ureteral flexible mirror lithotripsy), the negative pressure suction sheath is a key auxiliary instrument for ensuring the operation field of the endoscope and controlling the pressure of the renal pelvis, and it needs to be controlled by negative pressure to achieve stone suction and operation field cleaning, which is of great significance to the smooth development of the operation.

[0003] At present, the negative pressure adjusting structure of the existing negative pressure suction sheath is designed on the suction branch (such as the connecting branch of the negative pressure connecting pipe and the outer sheath pipe) of the proximal end of the sheath body, and the size of the negative pressure is adjusted by setting a rotary control switch on the branch, which is a common negative pressure adjusting method in the industry.

[0004] However, the existing negative pressure adjusting structure has obvious defects. On the one hand, the operation space is usually very narrow due to the patient's position, the operator's operating posture and the occupation of other instruments, and the setting of the branch switch makes the negative pressure adjusting part deviate from the main operation axis of the sheath body. The operator needs to extend his hand or adjust his hand posture to rotate the branch switch while holding the sheath handle, which has the problem of insufficient operation space adaptability. On the other hand, the rotary angle and force of the branch switch need to be accurately controlled, and the design of the position deviating from the main operation axis of the sheath body makes the hand force of the operator not coordinated during operation, and then the switch adjustment lag or misoperation occurs. More seriously, misoperation may also cause the sheath position to deviate, increasing the risk of mucosal damage, which is difficult to meet the clinical demand for instrument operation convenience and space adaptability. SUMMARY

[0005] The present application discloses a sealing structure, a negative pressure suction sheath and an endoscope assembly to solve the above technical problems in the related art.

[0006] In order to solve the above problems, the present application adopts the following technical scheme:

[0007] In a first aspect, the present application provides a sealing structure for a negative pressure suction sheath, comprising:

[0008] A first cover body is detachably connected to the proximal end of the sheath seat of the negative pressure suction sheath, the middle part of the first cover body is provided with a first through hole for the insertion of an endoscope insertion part, and a first air hole is provided on the radial outer side of the first through hole, and the first air hole is in communication with the internal passage of the sheath seat;

[0009] A second cover is sleeved outside the first cover and detachably connected with the sheath base of the negative pressure suction sheath, a second through hole is arranged in the middle of the second cover for the endoscope insertion part to pass through, and a second air hole is arranged outside the radial direction of the second through hole;

[0010] The second cover and the first cover form a sliding fit, and the overlapping opening degree of the first air hole and the second air hole is adjusted by relative sliding to control the negative pressure suction strength.

[0011] The second cover axially limits the first cover and provides support when the endoscope is inserted, preventing the first cover from collapsing.

[0012] In a second aspect, the application provides a negative pressure suction sheath comprising the sealing structure described above, and the sealing structure is arranged at the proximal end of the sheath base.

[0013] In a third aspect, the application provides an endoscope assembly, comprising:

[0014] An endoscope having an insertion part;

[0015] The negative pressure suction sheath described above, wherein the outer sheath tube is coaxially sleeved outside the insertion part to form an axially slidable fit;

[0016] The annular gap between the outer sheath tube and the insertion part constitutes a negative pressure suction channel, which is communicated with the external suction device through the sealing structure.

[0017] The technical solution adopted by the application can achieve the following beneficial effects:

[0018] The sealing structure in the application is used for a negative pressure suction sheath, and has the following advantages:

[0019] (1) The sealing structure in the application realizes negative pressure regulation through the relative sliding of the first cover and the second cover and the adjustment of the overlapping opening degree of the air holes, and the first cover and the second cover are arranged around the proximal end of the sheath base and the endoscope insertion part, forming a "coaxial sleeve" structure, without adding suction branches and switch components outside the main operation axis of the sheath body. This design integrates the negative pressure regulation structure and the main operation area of the sheath body (such as the sheath base and the endoscope insertion channel) to a high degree, avoids the additional occupation of operation space by the branch switch, and allows the surgeon to complete negative pressure regulation while holding the sheath body without "additional stretching or adjusting posture", perfectly adapts to narrow operation space, and solves the technical problem of "insufficient operation space adaptability".

[0020] (2) The sealing structure in the application adopts the operation mode of "cover body relative sliding" for negative pressure adjustment: the first cover body is sleeved with the second cover body and surrounds the endoscope insertion part, when the operator holds the sheath seat or the second cover body, the fingers can directly act on the edge of the second cover body to realize sliding adjustment, the operation action is highly coordinated with the holding posture, and there is no need for additional "switching force application position"; at the same time, the change of the overlapping opening degree of the first air hole and the second air hole is linearly related to the sliding stroke (for example, the arc-shaped long hole design can realize progressive adjustment of negative pressure), the operator can accurately control the negative pressure intensity through the sliding amplitude, avoiding the problem of "angle and intensity difficult to control" of the traditional rotary control type switch, effectively reducing adjustment lag and misoperation, and improving the convenience and accuracy of negative pressure adjustment.

[0021] (3) The sealing structure in the application reduces safety hazards from two aspects: on the one hand, the negative pressure adjustment structure is integrated with the sheath seat and the endoscope insertion channel, and the adjustment operation does not need to touch the sheath body, avoiding the sheath body being pulled or deviated due to "adjusting branch switch"; on the other hand, the second cover body forms "axial limiting" to the first cover body, and can provide support for the first cover body when the endoscope is inserted, preventing it from collapsing; both ensure the structural stability of the second cover body during sliding adjustment, and avoid the endoscope insertion being blocked or the internal channel of the sheath seat being deformed due to the collapse of the first cover body, indirectly ensuring the position stability of the sheath in the operation, reducing the risk of mucosal damage from the source, and improving the safety of the operation.

[0022] (4) The sealing structure in the application directly discards the traditional branch switch structure through the design of "double cover body + double air hole cooperation", integrates the negative pressure adjustment function and the sealing structure (the sealing effect of the first cover body and the second cover body on the proximal end of the sheath seat) into one, the first cover body is connected with the sheath seat to realize basic sealing, the second cover body is connected with the sheath seat to further strengthen the sealing, and the sliding cooperation of the double cover bodies realizes negative pressure adjustment, which not only meets the core requirement of "sealing performance" of the negative pressure suction sheath, but also realizes the "non-branch switch" negative pressure adjustment through structural integration, achieving the technical goal of optimizing the negative pressure control structure and avoiding the branch switch. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any inventive labor.

[0024] Figure 1 is a structural schematic diagram of embodiment 1 of the present application;

[0025] Figure 2 isFigure 1 Cross-sectional view of A-A

[0026] Figure 3 Figure 2 Enlarged view of B

[0027] Figure 4 Structure diagram of the first cover body in Embodiment 1 of the present application

[0028] Figure 5 Top view of the first cover body in Embodiment 1 of the present application

[0029] Figure 6 Figure 5 Cross-sectional view of C-C

[0030] Figure 7 Structure diagram of the second cover body in Embodiment 1 of the present application

[0031] Figure 8 Structure diagram of the second cover body in Embodiment 1 of the present application from another angle

[0032] Figure 9 Structure diagram of another embodiment in Embodiment 1 of the present application

[0033] Figure 10 Structure diagram of the second cover body in another embodiment in Embodiment 1 of the present application

[0034] Figure 11 Structure diagram of the second cover body in another embodiment in Embodiment 1 of the present application from another angle

[0035] Figure 12 Top view of the first cover body in another embodiment in Embodiment 1 of the present application

[0036] Figure 13 Figure 12 Cross-sectional view of D-D

[0037] Figure 14 Structure diagram of the first cover body in yet another embodiment in Embodiment 1 of the present application

[0038] In the figure: 1, first cover body; 2, second cover body; 3, sheath seat; 4, first through hole; 5, first air hole; 6, second through hole; 7, second air hole; 8, annular protrusion; 9, first annular sliding slot; 10, annular support body; 11, annular support slot; 12, second annular sliding slot; 13, first annular protrusion; 14, second annular protrusion; 15, clamping sliding block; 16, clamping sliding slot; 17, first protruding part; 18, second protruding part; 19, elastic sealing lip structure; 20, outer sheath tube; 21, finger ring; 22, negative pressure branch pipe. DETAILED DESCRIPTION​​​

[0039] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present application.

[0040] The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second" and the like are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in a "or" relationship.

[0041] In the minimally invasive surgery of ureteroscopy lithotripsy and other urological surgeries, the negative pressure suction sheath plays an important role in maintaining a clear endoscopic view and controlling the pressure of the renal pelvis. Through negative pressure suction, it can timely remove the stones and effusion during the operation to ensure the smooth progress of the operation. At present, the negative pressure adjustment function of the negative pressure suction sheath on the market depends on the rotary control switch set on the suction branch near the sheath body. This branch is usually the connecting branch of the negative pressure connecting pipe and the outer sheath pipe 20, and the rotation of the switch directly determines the negative pressure.

[0042] However, in clinical surgery, the operation space is often limited by the patient's position, the surgeon's operating posture, and the occupation of endoscopes, laser fibers and other instruments, and is extremely cramped. Since the branch switch deviates from the main operation axis of the sheath body, when the surgeon holds the sheath handle, he needs to extend his hand or adjust his holding posture to reach the switch, resulting in poor adaptability of operation and space. Moreover, the rotary control switch has strict requirements for the rotation angle and the force, and the design deviating from the main operation axis of the sheath body can easily cause imbalance of the force exerted by the hand, which may not only cause delay in negative pressure adjustment and misoperation, but also may cause the sheath body to deviate due to the hand movement, thereby increasing the risk of ureteral mucosa injury, and cannot meet the core needs of instrument operation convenience and space adaptability. Therefore, it is urgent to optimize the negative pressure control structure of the negative pressure suction sheath and abandon the branch switch design to adapt to the narrow surgical space and improve the operation adaptability. Therefore, the present application provides a sealing structure, a negative pressure suction sheath and an endoscope assembly, which are described below in conjunction with Figures 1-14 The sealing structure, negative pressure suction sheath and endoscope assembly in the present application will be described in detail.

[0043] Embodiment 1:

[0044] Referring to Figures 1-8 The application provides a sealing structure for a negative pressure suction sheath, comprising:

[0045] A first cover body 1 is detachably connected to a proximal end of a sheath base 3 of the negative pressure suction sheath, a middle part of the first cover body 1 is provided with a first through hole 4 for an endoscope insertion part to pass through, and a first air hole 5 is arranged on a radial outer side of the first through hole 4, and the first air hole 5 is in communication with an internal passage of the sheath base 3;

[0046] A second cover body 2 is sleeved on an outer side of the first cover body 1 and is detachably connected to the sheath base 3 of the negative pressure suction sheath, a middle part of the second cover body 2 is provided with a second through hole 6 for the endoscope insertion part to pass through, and a second air hole 7 is arranged on a radial outer side of the second through hole 6;

[0047] The second cover body 2 and the first cover body 1 are in sliding fit, and the overlapping opening degree of the first air hole 5 and the second air hole 7 is adjusted by relative sliding to control the negative pressure suction strength;

[0048] The second cover body 2 axially limits the first cover body 1 and provides support when the endoscope is inserted to prevent the first cover body 1 from collapsing.

[0049] In some embodiments, the sliding fit mode of the second cover body 2 and the first cover body 1 is rotary sliding. It can be understood that, by the rotary sliding fit mode, the negative pressure adjustment operation is more in line with the natural action habit of the operator's hand. When holding the sheath body, the operator can adjust the overlapping opening degree of the first air hole 5 and the second air hole 7 by rotating the second cover body 2 with a single finger, without the need to greatly adjust the hand posture, the operation is more coherent, further improving the operation convenience in a narrow surgical space, and the rotary sliding mode can realize continuous and smooth adjustment of the negative pressure strength, avoiding the feeling of stagnation during the adjustment process and reducing the risk of misadjustment due to excessive operation amplitude.

[0050] In some embodiments, the first cover 1 is provided with a ring-shaped protrusion 8, and a first annular sliding groove 9 is formed on one side of the ring-shaped protrusion 8 facing the side wall of the second through hole 6, and the side wall of the second through hole 6 and the annular sliding groove form a sliding fit. It can be understood that, on the one hand, this structure provides accurate guidance and limiting for the relative sliding of the second cover 2 and the first cover 1, ensures that the two always maintain coaxial during sliding, effectively avoids mispositioning of the first air hole 5 and the second air hole 7 due to cover deviation, reduces the interference of cover shaking on the accuracy of negative pressure adjustment, and the close fit of the sliding groove and the side wall of the through hole can further improve the overall sealing performance of the sealing structure to prevent negative pressure leakage. On the other hand, the cooperation of the ring-shaped protrusion 8 and the first annular sliding groove 9 can assist the second cover 2 to form axial limiting for the first cover 1, provide stable support for the first cover 1 when the endoscope is inserted, avoid its collapse due to insertion force, and thus prevent the endoscope from being blocked or the internal passage of the sheath seat 3 from being deformed, indirectly ensure the positional stability of the sheath in the operation, reduce the risk of mucosa damage caused by sheath deviation from the source, and ultimately improve the reliability of negative pressure adjustment and sealing performance while enhancing the safety of surgical operation.

[0051] In some embodiments, the sealing structure further comprises an annular support 10, and the ring-shaped protrusion 8 is provided with an annular support groove 11 on the side away from the side wall of the second through hole 6, which is adapted to the annular support 10.

[0052] On the one hand, the annular support 10 can provide additional rigid support for the ring-shaped protrusion 8 of the first cover 1, significantly enhance the structural stability of the ring-shaped protrusion 8 during sliding adjustment, avoid its deformation due to stress, and further increase the overall anti-collapse ability of the first cover 1. Especially when the endoscope insertion part is inserted, it can effectively resist the extrusion of the insertion force on the first cover 1, prevent the first cover 1 from being blocked due to collapse, or cause problems such as narrowing and blocking of the internal passage of the sheath seat 3 due to cover deformation. On the other hand, the cooperation of the annular support 10 and the annular support groove 11 can assist the second cover 2 to strengthen the supporting and limiting effect of the first cover 1, so that the first cover 1 always maintains stable structure during negative pressure adjustment and instrument operation, avoids the influence of cover collapse on sealing performance, indirectly ensures the positional stability of the sheath in the operation, reduces the operation deviation caused by structural deformation, and thus reduces the risk of mucosa damage, while ensuring the smoothness of the negative pressure suction passage and the accuracy of negative pressure control, providing protection for safe and efficient operation.

[0053] Please refer to Figures 9-13 In some embodiments, the first cover 1 is provided with a ring-shaped protrusion 8, and the ring-shaped protrusion 8 is provided with:

[0054] a first annular sliding groove 9 facing the side wall of the second through hole 6;

[0055] The second annular sliding groove 12 is located on the side wall of the second through hole 6;

[0056] The second cover 2 is provided with:

[0057] The first annular protrusion 13 is in sliding fit with the first annular sliding groove 9;

[0058] The second annular protrusion 14 is in sliding fit with the second annular sliding groove 12. It can be understood that, first, the fit structure can guide and limit the relative sliding of the first cover 1 and the second cover 2 in both directions, ensure that the two always maintain a stable coaxial relationship during sliding, completely avoid the deviation or shaking problem that easily occurs in unilateral fit, significantly enhance the stability and precision of sliding adjustment, and at the same time, disperse the contact force between the covers, reduce local wear, and effectively prolong the service life of the sealing structure; second, the sliding fit of the double sliding grooves and the double protrusions can strengthen the axial limiting effect of the second cover 2 on the first cover 1, provide uniform and stable support force for the first cover 1 when the endoscope is inserted, prevent it from collapsing due to extrusion by the insertion force, and thus avoid the endoscope insertion being blocked or the internal passage of the sheath seat 3 being deformed, indirectly ensure the position stability of the sheath in the operation, and reduce the risk of mucosa damage caused by the sheath deviation from the source; third, the fit of the double sliding grooves and the double protrusions can also reduce the sliding gap between the covers, further improve the overall sealing performance of the sealing structure, prevent negative pressure from leaking from the gap, ensure the stability and reliability of the negative pressure suction, and ultimately optimize the operation performance and prolong the service life of the instrument while taking into account the safety of the operation and the control effect of the negative pressure.

[0059] In some embodiments, the sheath seat 3 is provided with a clamping sliding block 15 on the outer wall of the proximal end, and the second cover 2 is provided with a circumferentially extending clamping sliding groove 16 on the inner wall, and the clamping sliding block 15 and the clamping sliding groove 16 form a slidable clamping fit structure. It can be understood that the slidable clamping fit structure can realize the clamping fixation and relative sliding adjustment between the second cover 2 and the sheath seat 3. Through the cooperation of the clamping sliding block 15 and the clamping sliding groove 16, the relative sliding function of the two is realized while ensuring the stable connection of the second cover 2 and the sheath seat 3, without the need for additional complex connecting components, simplifying the structure design. This integrated clamping-sliding structure ensures that the second cover 2 is always reliably connected with the sheath seat 3 during the sliding adjustment process, avoiding loosening or falling off during adjustment, and at the same time, the circumferentially extending sliding groove design provides sufficient sliding stroke for negative pressure adjustment, ensuring that the overlapping opening degree of the first air hole 5 and the second air hole 7 can be adjusted in a large range, meeting the negative pressure demand of different operation scenes.

[0060] In some embodiments, the first air hole 5 and the second air hole 7 are both arc-shaped long holes, the arc lengths of which are matched, and the extension directions of the arc-shaped long holes are consistent with the relative sliding direction of the first cover body 1 and the second cover body 2. It can be understood that, through the design of the arc-shaped long holes, the matching with the relative sliding direction of the cover bodies is formed, so that the overlapping area of the first air hole 5 and the second air hole 7 changes linearly during the sliding process, thereby realizing the continuous and smooth adjustment of the negative pressure strength. The design of the matched arc lengths ensures the integrity of the adjustment range, that is, both the complete closure of the air hole and the maximum opening can be realized, so as to meet the fine control requirement of the negative pressure in the operation. At the same time, the arc-shaped structure is naturally matched with the rotating and sliding action of the cover bodies, so as to reduce the structural interference during the adjustment process and improve the smoothness of the operation.

[0061] Please refer to Figure 14 In some embodiments, the edge of the first air hole 5 has a first protruding portion 17 on the side facing the second cover body 2. It can be understood that, through the design of the first protruding portion 17, the close-fitting tightness of the first cover body 1 and the second cover body 2 in the air hole area is enhanced, and the negative pressure leakage caused by the gap between the two cover bodies is reduced. The first protruding portion 17 can always be in contact with the corresponding surface of the second cover body 2 during the relative sliding of the cover bodies, forming a local sealing strengthening structure. Especially when the first air hole 5 and the second air hole 7 partially overlap, the first protruding portion 17 can effectively block the overflow of air flow from the gap of the non-overlapping area, improve the accuracy of negative pressure control, reduce the energy loss caused by negative pressure leakage, and ensure the stability of the suction efficiency.

[0062] Please refer to Figure 14 In some embodiments, the edge of the first cover body 1 has a second protruding portion 18 on the side facing the second cover body 2. It can be understood that, through the second protruding portion 18 at the edge, the overall sealing between the first cover body 1 and the second cover body 2 is strengthened, forming a surrounding sealing barrier to prevent external air from entering from the gap between the edges of the two cover bodies or internal air from leaking. The second protruding portion 18 can also play a guiding role during the relative sliding of the second cover body 2 and the first cover body 1, reduce the friction jam at the edge, make the sliding adjustment smoother, and enhance the structural stability of the cooperation between the two cover bodies, thereby avoiding the sealing failure caused by the misalignment of the edge.

[0063] In some embodiments, the second cover body 2 adopts a two-half split structure, and the two half cover bodies are hinged. It can be understood that, through the two-half split structure with the hinge, the assembly process of the second cover body 2, the first cover body 1 and the sheath seat 3 is significantly simplified.

[0064] In some embodiments, the first through hole 4 is provided with an elastic sealing lip structure 19. Through the pre-bending design of the pre-bending sealing lip, it can closely fit the outer wall of the endoscope insertion part to form a tight dynamic seal. When the endoscope insertion part is inserted or slightly moves in the first through hole 4, the elastic sealing lip can deform to adapt to the shape change of the insertion part, always maintain contact sealing, effectively prevent negative pressure from leaking from the gap between the first through hole 4 and the insertion part, and ensure the stability of the negative pressure suction. At the same time, the characteristics of the elastic material reduce the friction damage to the surface of the insertion part, and the pre-bending structure can disperse the contact pressure to avoid affecting the operation flexibility of the endoscope due to excessive extrusion, ensuring the sealing performance while considering the smoothness of the instrument operation.

[0065] Embodiment 2:

[0066] The application provides a negative pressure suction sheath, which comprises the sealing structure described in Embodiment 1, and the sealing structure is arranged at the proximal end of a sheath base 3. The sheath base 3 is further provided with a negative pressure branch pipe 22 and a finger ring 21.

[0067] Embodiment 3:

[0068] The application provides an endoscope assembly, comprising:

[0069] an endoscope having an insertion part;

[0070] the outer sheath tube 20 of the negative pressure suction sheath in Embodiment 2 is coaxially sleeved outside the insertion part to form an axially slidable cooperation relationship;

[0071] the annular gap between the outer sheath tube 20 and the insertion part constitutes a negative pressure suction channel, and the negative pressure suction channel is in communication with an external suction device through the sealing structure.

[0072] In addition, it should be noted that the scope of the methods and devices in the embodiments of the application is not limited to performing functions in the order shown or discussed, and can also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved, for example, the described method can be performed in an order different from the described order, and various steps can also be added, omitted or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0073] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered within the protection scope of the application.

Claims

1. A sealing structure for a negative pressure suction sheath, characterized in that, include: The first cover is detachably connected to the proximal end of the sheath seat of the negative pressure suction sheath. The middle part of the first cover is provided with a first through hole for the endoscope insertion part to pass through, and a first air hole is provided on the radially outer side of the first through hole. The first air hole communicates with the internal channel of the sheath seat. The second cover is fitted on the outside of the first cover and is detachably connected to the sheath seat of the negative pressure suction sheath. The middle part of the second cover is provided with a second through hole for the endoscope insertion part to pass through, and a second air hole is provided on the radially outer side of the second through hole. The second cover and the first cover form a sliding fit, and the sliding fit between the second cover and the first cover is a rotational sliding. The overlap opening of the first air hole and the second air hole is adjusted by relative sliding to control the negative pressure suction intensity. The second cover axially limits the first cover and provides support when the endoscope is inserted, preventing the first cover from collapsing. The first cover has an annular protrusion in the middle, and the annular protrusion has: The first annular groove facing the sidewall of the second through hole; The second annular groove facing away from the sidewall of the second through hole; The second cover is provided with: The first annular protrusion that slides in conjunction with the first annular groove; The second annular protrusion slides in conjunction with the second annular groove.

2. The sealing structure according to claim 1, characterized in that, The outer wall near the proximal end of the sheath seat is provided with a snap-fit ​​slider, and the inner wall of the second cover is provided with a circumferentially extending snap-fit ​​groove. The snap-fit ​​slider and the snap-fit ​​groove form a slidable snap-fit ​​engagement structure.

3. The sealing structure according to claim 1, characterized in that, Both the first and second air holes are arc-shaped elongated holes with matching arc lengths, and the extension direction of the arc-shaped elongated holes is consistent with the relative sliding direction of the first and second covers.

4. The sealing structure according to claim 1, characterized in that, The edge of the first vent has a first protrusion on the side facing the second cover; And / or, the edge of the first cover has a second protrusion on the side facing the second cover; And / or, the second cover adopts a two-part split structure, with the two half-covers hinged together; And / or, the edge of the first through hole is provided with a pre-bent elastic sealing lip structure.

5. A negative pressure suction sheath, characterized in that, The sealing structure includes any one of claims 1-4, wherein the sealing structure is disposed at the proximal end of the sheath seat.

6. An endoscope assembly, characterized in that, include: An endoscope, which has an insertion part; As described in claim 5, the negative pressure suction sheath has its outer sheath coaxially sleeved on the outside of the insertion part, forming an axially sliding fit. The annular gap between the outer sheath and the insertion part forms a negative pressure suction channel, which is connected to the external suction device through the sealing structure.

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