Negative pressure connecting assembly and endoscope

Abstract

The invention discloses a negative pressure connecting assembly and an endoscope, and relates to the technical field of endoscopes. The negative pressure connecting assembly comprises a first structural part, a second structural part and a sealing ring. A sealing ring is arranged between a first abutting surface in a first connecting end of a first structural part and a second abutting surface in a second connecting end of a second structural part, the outer diameter of the sealing ring is smaller than the inner diameter of the second connecting end, and the inner diameter of the sealing ring is larger than the outer diameter of the first connecting end. After the sealing ring is extruded from the first abutting face and the second abutting face in the axial direction, deformation occurs in the axial direction, and meanwhile, radial deformation occurs in at least part of the area, so that a gap between the first connecting end and the sealing ring in the radial direction and a gap between the second connecting end and the sealing ring in the radial direction are sealed. And only large force needs to be applied when the sealing ring is compressed, so that the first structural part, the second structural part and the sealing part are more convenient to assemble.

Description

Technical Field

[0001] The present invention relates to the field of endoscopes, and in particular to a negative pressure connection assembly and an endoscope. Background Art

[0002] In an endoscope, especially in an endoscope for sputum aspiration, it is necessary to connect a sputum suction bottle, external negative pressure, a control switch, and a pipeline for extending into a patient's body to aspirate sputum. In the prior art, the above-mentioned components are usually bonded with glue. However, it is difficult to disassemble and reuse the components after gluing, and after disassembly, due to the influence of the original glue, the difficulty of reassembly is relatively large, and there is also a situation where it is difficult to reuse.

[0003] To solve the above problems, a method of interference connection instead of gluing has emerged to combine the above components, which can achieve the reuse of the above components. For example, the technical solution mentioned in the patent document US20240423449A1. However, although such a solution can solve the problem of component reuse, it has the problem that since the components are connected by interference connection and the stability of the connection needs to be ensured, a relatively large force needs to be continuously applied at the beginning of the interference connection between two components (such as a negative pressure suction nozzle and a Y-shaped connector) to assemble them in place. This is a very time-consuming and laborious thing for the operator. At the same time, there is also a situation where if the force is insufficient during the assembly process, the negative pressure suction nozzle and the Y-shaped connector cannot be assembled in place, which will cause a gap between the negative pressure suction nozzle and the Y-shaped connector. During the process of aspirating sputum from the patient, the aspirated sputum may get stuck in the gap and cause blockage. Summary of the Invention

[0004] The present invention discloses a negative pressure connection assembly and an endoscope to at least partially improve the above technical problems.

[0005] To solve the above problems, the present invention adopts the following technical solutions: On the one hand, an embodiment of the present application provides a negative pressure connection assembly, including: a first structural member, a second structural member, and a sealing ring. The first structural member has a first connection end, and a first abutting surface is formed inside the first connection end. The second structural member has a second connection end that cooperates with the first connection end, and a second abutting surface is formed on the outer surface of the first connection end; the first connection end is nested inside the second connection end, and one of the first structural member and the second structural member is a negative pressure connection nozzle, and the other is a connector. The sealing ring is disposed inside the second connection end and sleeved on the outer surface of the first connection end, and is located between the first abutting surface and the second abutting surface. The outer diameter of the sealing ring is less than or equal to the inner diameter of the second connection end, and the inner diameter of the sealing ring is greater than or equal to the outer diameter of the second connection end; the sealing ring is configured such that after being axially squeezed by the first abutting surface and the second abutting surface, at least a partial region undergoes a radial deformation to seal the gap between the first connection end and the sealing ring in the radial direction and seal the gap between the second connection end and the sealing ring in the radial direction.

[0006] On the other hand, an embodiment of the present application further provides an endoscope, including the negative pressure connection assembly as described above.

[0007] The technical solution adopted by the present invention can achieve the following beneficial effects: For the negative pressure connection assembly provided by the embodiment of the present application, by arranging a sealing ring between the first abutting surface inside the first connection end of the first structural member and the second abutting surface inside the second connection end of the second structural member, and setting the outer diameter of the sealing ring to be less than the inner diameter of the second connection end and the inner diameter to be greater than the outer diameter of the first connection end, and when the sealing ring is axially squeezed by the first abutting surface and the second abutting surface, while undergoing a deformation in the axial direction, at least a partial region undergoes a radial deformation to seal the gap between the first connection end and the sealing ring in the radial direction and seal the gap between the second connection end and the sealing ring in the radial direction. When assembling the first structural member, the second structural member, and the sealing member of the negative pressure connection assembly provided by the embodiment of the present application, only a relatively large force needs to be applied when compressing the sealing ring, thereby making it more convenient to assemble the first structural member, the second structural member, and the sealing member, and solving the problem in the prior art that it is time-consuming and laborious to assemble the negative pressure connection assembly. When applying the above negative pressure connection assembly to an endoscope, the above problem can also be solved. Description of the Drawings

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0009] Figure 1 Shows a schematic structural diagram of an endoscope in an embodiment of the present application.

[0010] Figure 2 Shows a partial schematic structural diagram of an endoscope in an embodiment of the present application.

[0011] Figure 3 Shows a cross-sectional view of an endoscope in an embodiment of the present application.

[0012] Figure 4 Shows a schematic structural diagram of a negative pressure connection assembly in an embodiment of the present application.

[0013] Figure 5 Shows an exploded view of a first structural member, a second structural member, and a sealing ring before assembly in a negative pressure connection assembly in an embodiment of the present application.

[0014] Figure 6 Shows an exploded view of a first structural member, a second structural member, and a sealing ring during assembly in a negative pressure connection assembly in an embodiment of the present application.

[0015] Figure 7 Shows an exploded view of a first structural member, a second structural member, and a sealing ring after assembly is completed in a negative pressure connection assembly in an embodiment of the present application.

[0016] Figure 8 Shows a schematic diagram of a sealing ring in a negative pressure connection assembly in an embodiment of the present application.

[0017] In the figure: 1, endoscope; 10, negative pressure connection assembly; 110, first structural member; 111, first connection end; 112, first abutting surface; 120, second structural member; 121, second connection end; 122, second abutting surface; 130, sealing ring; 131, concave portion; 132, avoidance structure; 140, limiting structure; 141, first locking structure; 142, second locking structure; 143, avoidance groove; 20, housing. Detailed implementation manners

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0019] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than 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 this application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0020] In the embodiments of this application, "proximal" and "distal" refer to the relative positions of each component to the user in the usage environment. Among them, the end closer to the user is designated as "proximal", and the end farther from the user is designated as "distal".

[0021] Hereinafter describes the inventive concept of this application: In an endoscope, especially an endoscope for sputum aspiration, it is necessary to connect a sputum aspiration bottle, an external negative pressure, a control switch, and a pipeline for extending into the patient's body for sputum aspiration. In the prior art, the above-mentioned components are usually glued. However, this makes it difficult to disassemble and reuse the components after gluing. And after disassembly, due to the influence of the original glue, it is difficult to reassemble, and there is also a situation where it is difficult to reuse.

[0022] To solve the above problems, a method of interference connection instead of gluing has emerged to combine the above-mentioned components, which can achieve the reuse of the above-mentioned components. For example, the technical solution mentioned in the patent document US20240423449A1. However, although such a solution can solve the problem of component reuse, it has the problem that since the components are connected by interference connection and the connection stability needs to be ensured, a relatively large force needs to be continuously applied at the beginning of the interference connection of two components (such as a negative pressure suction nozzle and a Y-shaped connector) to assemble them in place. This is a very time-consuming and laborious thing for the operator. At the same time, there is also a situation where if the force is insufficient during the assembly process, the negative pressure suction nozzle and the Y-shaped connector cannot be assembled in place, which will cause a gap between the negative pressure suction nozzle and the Y-shaped connector. During the process of sputum aspiration for the patient, the aspirated sputum may get stuck in the gap and cause blockage.

[0023] The inventor found that the reason for the above problem is that in order to ensure the tightness of the interference connection, multiple interference regions need to be set between the negative pressure suction nozzle and the Y-shaped connector. That is to say, multiple protruding parts need to be set on the inner surface of the negative pressure suction nozzle and the outer surface of the Y-shaped connector to ensure the tightness of the interference connection. This causes the operator to apply a great deal of force when pushing the first interference region for interference connection, and continuous application of a great deal of force is required until the last interference region is pushed for interference connection to complete the assembly between the entire negative pressure suction nozzle and the Y-shaped connector.

[0024] Based on this, the inventor provides a negative pressure connection assembly and an endoscope. The negative pressure connection assembly is more labor-saving in the early stage of the assembly process of the negative pressure suction nozzle and the Y-shaped connector, and only a certain amount of force is required in the final stage of the assembly to complete the assembly.

[0025] The following combines the attached Figures 1 to 8 drawings to provide a detailed description of a negative pressure connection assembly 10 and an endoscope 1 provided by the present application through specific embodiments and their application scenarios.

[0026] Please also refer to Figures 1 - 3 In the embodiment of the present application, an endoscope 1 is provided, including: a housing 20 and a negative pressure connection assembly 10, wherein the negative pressure connection assembly 10 is disposed inside the housing 20. The specific form and structure of the housing 20 are not limited in the embodiment of the present application, and specific reference can be made to relevant prior art.

[0027] Please refer to Figure 4 drawings. The negative pressure connection assembly 10 can have multiple interfaces, and the interfaces can be used for connecting with the external negative pressure, connecting with the pipeline extending into the patient's body, and connecting with the lesion sucked out from the patient's body, etc., which can be specifically set according to the actual situation, and the interfaces can be connected by a detachable connection method.

[0028] In this embodiment, the negative pressure connection assembly 10 can include: a first structural member 110, a second structural member 120, and a sealing ring 130. It can be understood that the first structural member 110 and the second structural member 120 can correspond to the interfaces described above, and a negative pressure suction channel can be formed inside the first structural member 110 and the second structural member 120.

[0029] Please also refer to Figures 5 - 7, wherein, the first structural member 110 may have a first connection end 111, a negative pressure suction channel inside the first connection end 111 may be formed with a first abutting surface 112, the second structural member 120 may have a second connection end 121, wherein the second connection end 121 may be arranged in cooperation with the first connection end 111, and a negative pressure suction channel inside the second connection end 121 may have a second abutting surface 122 that cooperates with the first connection end 111.

[0030] The embodiments of the present application do not limit the specific structures of the first structural member 110 and the second structural member 120. For example, in one implementation, one of the first structural member 110 and the second structural member 120 is a negative pressure connection nozzle, and the other is a connector. For ease of description, hereinafter, the first structural member 110 is taken as the negative pressure connection nozzle and the second structural member 120 is taken as the connector, and the example where the first structural member 110 is nested inside the second structural member 120 is used for illustration.

[0031] Please refer to Figures 5 - 8 , the sealing ring 130 may be arranged inside the second connection end 121, sleeved on the outer surface of the first connection end 111, and located between the first abutting surface 112 and the second abutting surface 122. That is to say, in this embodiment, the first connection end 111, the sealing ring 130, and the second connection end 121 may be arranged in a nested relationship layer by layer.

[0032] In a specific implementation, the outer diameter of the sealing ring 130 is less than or equal to the inner diameter of the second connection end 121, and the inner diameter of the sealing ring 130 is greater than or equal to the outer diameter of the first connection end 111. This can make there be almost no resistance during the nesting process of the first connection end 111, the sealing ring 130, and the second connection end 121. This nesting and assembling process with almost zero resistance enables the operator to easily push each component into place during the assembling process without spending too much effort to overcome possible jamming situations. Furthermore, it can reduce the operation difficulty of the operator during the assembling process, facilitating the assembling of the first connection end 111, the sealing ring 130, and the second connection end 121. Both in terms of time cost and operation difficulty, it has achieved great optimization, strongly ensuring that the assembling work can be completed efficiently and smoothly, laying a good foundation for the subsequent smooth development of surgical operations.

[0033] In this embodiment, the sealing ring 130 may be arranged such that after being axially extruded by the first abutting surface 112 and the second abutting surface 122, at least part of the area undergoes radial deformation to seal the gap between the first connection end 111 and the sealing ring 130 in the radial direction and seal the gap between the second connection end 121 in the radial direction of the sealing ring 130, thereby achieving the sealing effect of the entire negative pressure connection assembly 10.

[0034] As described above, during the installer's installation process of the entire negative pressure connection assembly 10, in the first half (before squeezing the sealing ring 130), the installer can assemble with almost no resistance. Only in the second half (starting from squeezing the sealing ring 130 to the end of assembly) is it necessary to use greater force to achieve sealing and complete the assembly. In the embodiment of the present application, since only one step requires the installer to use greater force, it can serve as a reminder to the installer when assembling the negative pressure connection assembly 10. That is to say, when the installer perceives that the resistance increases and greater force is needed, it means that the assembly is about to be completed. At this time, the installer only needs to use greater force to cause the sealing ring 130 to deform to complete the sealing, greatly improving the installer's fault tolerance during the assembly process.

[0035] It can be understood that in the traditional negative pressure connection assembly 10, since the assembly process requires continuous use of greater force to overcome the resistance between the first structural member 110 and the sealing ring 130 and the resistance between the second structural member 120 and the sealing ring 130, during the installer's assembly process of the negative pressure connection assembly 10, it is easy to have the situation of incomplete assembly. As a result, a gap is generated between the first structural member 110 and the sealing ring 130. This gap may not only cause blockage during the process of aspirating the lesion, but also cause the first structural member 110 and the second structural member 120 to become detached.

[0036] Therefore, in one implementation manner, the first abutting surface 112 and the end surface of the sealing ring 130 can be arranged to be in contact. For example, both the first abutting surface 112 and the end surface of the sealing ring 130 can be arranged as flat surfaces. This can help avoid or reduce the generation of a gap between the first abutting surface 112 and the end surface of the sealing ring 130, and thus facilitate the installer to more conveniently install the first structural member 110 and the sealing ring 130 in place, avoiding or reducing the possibility of blockage during the process of aspirating the lesion.

[0037] It can be understood that in some other implementation manners, the second abutting surface 122 can also be arranged to be in contact with the end surface of the sealing ring 130. For specific details, reference can be made to the foregoing content, and details will not be elaborated here.

[0038] Please continue to refer to Figure 8 , in a specific implementation manner, the sealing ring 130 can have an inner concave portion 131, where the inner concave portion 131 can be arranged to radially deform inward after being axially squeezed. That is to say, in this implementation manner, after the sealing ring 130 is axially squeezed, the inner concave portion 131 can be made to fit more tightly against the first connection end 111, thereby achieving sealing between the sealing ring 130 and the first connection end 111 in the radial direction.

[0039] Specifically, in this embodiment, the surface of the concave portion 131 close to the second structural member 120 is recessed towards the first structural member 110, and the surface of the concave portion 131 close to the first structural member 110 protrudes towards the first structural member 110. In this way, after the sealing ring 130 is extruded in the radial direction, it is easier to deform in the axial direction and easier to convert the axial deformation into radial deformation.

[0040] In addition, in some embodiments, a relief structure 132 may be provided on the surface of the concave portion 131 close to the second connection end 121. This can further promote the radial deformation of the concave portion 131 after being extruded in the axial direction. The specific form of the relief structure 132 is not limited in the embodiments of the present application. For example, in some embodiments, the relief structure 132 may be a slit. In another example, in some other embodiments, the relief structure 132 may also be a groove, etc., which can be specifically set according to the actual situation and is not limited here.

[0041] It can be understood that, in some other embodiments, a relief structure 132 may also be provided on the surface of the concave portion 131 close to the first connection end 111. For specific details, reference can be made to the foregoing description and will not be elaborated here.

[0042] Meanwhile, in some embodiments, the structural stiffness of the concave portion 131 is smaller than that of other regions on the sealing ring 130. In this way, it is also easier for the concave portion 131 to deform radially after being extruded in the axial direction.

[0043] Please refer to again Figures 4 - 7 Furthermore, in some embodiments, the negative pressure connection assembly 10 may further include: a limiting structure 140. The limiting structure 140 can be connected to at least one of the first structural member 110 and the second structural member 120, and when the first structural member 110 is inserted into the second structural member 120, the limiting structure 140 can be used to fix the first structural member 110 and the second structural member 120.

[0044] The embodiments of the present application also do not limit the specific form of the limitation. For example, in some embodiments, the limiting structure 140 may be a limiting member that can be clamped between the first connection end 111 and the second connection end 121, and the limiting member can be used to prevent the sealing ring 130 from recovering its deformation after being compressed.

[0045] In this embodiment, the limiting structure 140 may include: a first locking structure 141 and a second locking structure 142. The first locking structure 141 may be disposed on the outer wall of the first connection end 111, and the second locking structure 142 may be disposed inside the second connection end 121, and the second locking structure 142 may be matched with the first locking structure 141. For example, in some embodiments, the first locking structure 141 may be a protrusion, and the second locking structure 142 may be a groove. Also, for example, in other embodiments, the first locking structure 141 may also be a groove, and the second locking structure 142 may also be a protrusion, etc., which can be specifically set according to the actual situation. For the convenience of description, hereinafter, the case where the first locking structure 141 is a protrusion and the second locking structure 142 is a groove will be taken as an example for illustration.

[0046] It can be understood that since the first locking structure 141 needs to be embedded into the second locking structure 142 during the cooperation process between the first locking structure 141 and the second locking structure 142, in a preferred embodiment, the first locking structure 141 may be made of an elastic material, which can make it more convenient for the first locking structure 141 to be embedded into the second locking structure 142.

[0047] It should be noted that the embodiment of the present application does not set the forming method of the first locking structure 141 and the first connection end 111. For example, in this embodiment, the first locking structure 141 may be integrally formed with the outer wall of the first connection end 111, which can improve the overall structural strength of the first locking structure 141 and the first structural member 110, and avoid or reduce the possibility of damage to the first locking member structure.

[0048] Similarly, in other embodiments, the second locking structure 142 may also be integrally formed with the inner wall of the second connection end 121. For the specific reasons, reference can be made to the foregoing content, and details will not be elaborated here.

[0049] Please continue to refer to Figure 6 and Figure 7 , further, in an embodiment, the limiting structure 140 may further include: an avoidance groove 143. The avoidance groove 143 may be located on one side of the first locking structure 141 and is used to provide a deformation space required for the first locking structure 141 to deform, so that the first locking structure 141 can have a receiving space when deforming, and thus it is beneficial to embed the first locking structure 141 into the second locking structure 142.

[0050] It is understandable that the embodiments of the present application do not limit the specific positions of the first locking structure 141 and the second locking structure 142. In a feasible embodiment, the end face of the first locking structure 141 in the axial direction can be flush with the first abutting face 112, which can make the structure of the entire first structural member 110 more compact. That is to say, the embodiments of the present application do not limit the specific forms and structures of the first abutting face 112 and the second abutting face 122. In this embodiment, the first abutting face 112 can form a surface that is close to the second locking structure 142 of the first locking structure 141.

[0051] In addition, in some embodiments, the second locking structure 142 can be disposed at the port of the second connection end 121. In this way, when the user pushes the first structural member 110 to make the first abutting face 112 approach the second abutting face 122, the cooperation between the first locking structure and the second locking structure can be completed without applying force for a long time, and thus the operator can be more labor-saving during the assembly process of the negative pressure connection assembly 10.

[0052] It is understandable that in this embodiment, the length of the sealing ring 130 can be greater than the distance between the first locking structure 141 and the port of the first connection end 111. This can ensure that after the first locking structure 141 and the second locking structure 142 are cooperated, the sealing ring 130 can be axially compressed and undergo radial deformation, and it can also make the space between the first abutting face 112 and the second abutting face 122 in the axial direction be completely filled with the sealing ring 130. Furthermore, it can avoid or reduce the problem that during the process of the operator performing negative pressure aspiration on the patient, such as pathological changes like phlegm getting stuck between the first structural member 110 and the second structural member 120, resulting in blockage. It should be noted that the length of the above-mentioned sealing ring 130 refers to the length of the sealing ring 130 in the axial direction.

[0053] The negative-pressure connection assembly 10 provided by the embodiment of the present application is configured such that a sealing ring 130 is disposed between a first abutting surface 112 within a first connection end 111 of a first structural member 110 and a second abutting surface 122 within a second connection end 121 of a second structural member 120. The sealing ring 130 is set to have an outer diameter smaller than the inner diameter of the second connection end 121 and an inner diameter larger than the outer diameter of the first connection end 111. When the sealing ring 130 is axially squeezed by the first abutting surface 112 and the second abutting surface 122, while deforming axially, at least a partial area thereof undergoes radial deformation, so as to seal the gap between the first connection end 111 and the sealing ring 130 in the radial direction and the gap between the second connection end 121 and the sealing ring 130 in the radial direction. When assembling the first structural member 110, the second structural member 120, and the sealing member in the negative-pressure connection assembly 10 provided by the embodiment of the present application, only a relatively large force needs to be applied when compressing the sealing ring 130, which is thus more convenient for assembling the first structural member 110, the second structural member 120, and the sealing member, and solves the problem of time-consuming and laborious assembly of the negative-pressure connection assembly 10 in the prior art. When applying the above negative-pressure connection assembly 10 to an endoscope 1, the above problem can also be solved.

[0054] It should be noted that, in this document, the terms "include", "comprise" or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising such element.

[0055] In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed. It may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0056] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. A negative pressure connection component is applied to an endoscope, characterized in that, The negative pressure connection assembly includes: A first structural member having a first connection end, and a first abutting surface is formed inside the first connection end; A second structural member having a second connection end that mates with the first connection end. A second abutting surface is formed on the outer surface of the first connection end. The first connection end is nested inside the second connection end. One of the first structural member and the second structural member is a negative pressure connection nozzle, and the other is a connector; A sealing ring disposed inside the second connection end and sleeved on the outer surface of the first connection end, and located between the first abutting surface and the second abutting surface. The outer diameter of the sealing ring is less than or equal to the inner diameter of the second connection end, and the inner diameter of the sealing ring is greater than or equal to the outer diameter of the first connection end. The sealing ring is configured such that after being axially squeezed by the first abutting surface and the second abutting surface, at least a partial region undergoes a radial deformation to seal the gap between the first connection end and the sealing ring in the radial direction and to seal the gap between the second connection end and the sealing ring in the radial direction.

2. The negative pressure connection assembly according to claim 1, characterized in that, The sealing ring has a concave portion configured to radially deform inwardly when axially squeezed.

3. The negative pressure connection assembly according to claim 2, wherein, The surface of the concave portion close to the second structural member is recessed toward the first structural member, and the surface of the concave portion close to the first structural member protrudes toward the first structural member.

4. The negative pressure connection assembly according to claim 2, wherein, A relief structure is provided on the surface of the concave portion close to the second connection end; And / or, the structural stiffness of the concave portion is less than that of other regions on the sealing ring.

5. The negative pressure connection assembly according to any one of claims 1-4, characterized in that, The negative pressure connection assembly further includes: a limiting structure connected to the first structural member and / or the second structural member and configured to fix the first structural member and the second structural member when the first structural member is inserted into the second structural member.

6. The negative pressure connection assembly according to claim 5, characterized in that, The limiting structure includes: A first locking structure provided on the outer wall of the first connection end; and A second locking structure that mates with the first locking structure and is provided on the inner wall of the second connection end; Wherein, the first locking structure is integrally formed with the outer wall of the first connection end, and / or, the second locking structure is integrally formed with the inner wall of the second connection end.

7. The negative pressure connection assembly according to claim 6, characterized in that, One of the first locking structure and the second locking structure is a protrusion, and the other is a groove that mates with the protrusion. The limiting structure further includes: a relief groove located on one side of the protrusion and configured to provide a deformation space required for the protrusion to deform during the insertion of the first connection end and the second connection end.

8. The negative pressure connection assembly according to claim 7, characterized in that, The first locking structure is a protrusion, and the end face of the first locking structure in the axial direction is flush with the first abutting surface.

9. The negative pressure connection assembly according to claim 7, characterized in that, The first locking structure and the one of the second structures that is configured as a protrusion are made of an elastic material; And / or, the length of the sealing ring is greater than the distance between the first locking structure and the port of the first connection end.

10. An endoscope, characterized in that, Comprising a negative pressure connection assembly as described in any one of claims 1-9.

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