Leakage detection joint and endoscope

Abstract

The leak detection connector comprises a valve body and a valve element, and the valve body is provided with an air inlet end, a closed end and a valve channel extending between the air inlet end and the closed end; the valve element is located in the valve channel, the valve element is arranged to move between a sealing position and an air guide position due to deformation, the valve element and the valve channel are sealed at the sealing position, and a flow guide channel is formed between the valve element and the valve channel at the air guide position. The valve element is kept at the sealing position and reset from the air guide position through the deformation capacity of the valve element, so that the leak hunting connector can be switched between the opening state and the closing state, and sealing testing can be conveniently conducted on the endoscope; the valve element can replace a hydrophobic film, a metal spring and a detachable rubber cover in the prior art, and therefore the problems that the sealing difficulty of circumferential attachment of the hydrophobic film is large, micropores are prone to being blocked, resetting of the metal spring is prone to losing, and the detachable rubber cover is prone to being lost can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and more particularly to a leak detection joint and an endoscope. Background Art

[0002] When an endoscope is being cleaned and disinfected, the entire endoscope needs to be immersed in a disinfectant solution. To prevent the disinfectant solution from entering the interior of the endoscope and damaging the electronic components, a leak test needs to be performed on the endoscope before cleaning to ensure that there are no air leaks before immersing the endoscope in the disinfectant solution for cleaning and disinfection. The leak detection interface of the endoscope needs to have the following functions: when connected to a leak detection device, the leak detection interface opens to ensure that the injected high-pressure gas can smoothly enter the interior of the endoscope to check for leak points; after the leak detection process is completed, the leak detection interface can automatically close to prevent the disinfectant solution from seeping into the endoscope during cleaning and disinfection.

[0003] For existing leak detection interfaces, some use a reset structure with a metal spring to achieve the switching between the two states of the interface by the thrust of the inserted leak detection device and the resilience of the spring. Some use a detachable rubber cover with slits that can be reliably closed under the action of water pressure, and the slits are forced to open when the plug is inserted during leak detection. Some are provided with a hydrophobic membrane that allows high-pressure gas to enter and can prevent water.

[0004] The disadvantages of these existing leak detection interfaces are as follows: the reset of the metal spring is prone to failure and is not resistant to corrosion by the disinfectant solution; the rubber cover is easily lost; the sealing of the circumferential attachment of the hydrophobic membrane is difficult, and its micropores are easily blocked. Summary of the Invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description section. The Summary of the Invention section is not intended to attempt to define the key features and essential technical features of the claimed technical solution, nor is it intended to determine the protection scope of the claimed technical solution.

[0006] To at least partially solve the above problems, the present application provides a leak detection joint for an endoscope, the leak detection joint comprising:

[0007] A valve body having an air inlet end, a closed end, and a valve passage extending between the air inlet end and the closed end; and

[0008] A valve core located in the valve passage, the valve core being configured to move due to deformation between a sealing position and a gas guiding position,

[0009] wherein the valve core forms a seal between the sealing position and the valve passage, and the valve core forms a gas guiding passage between the gas guiding position and the valve passage.

[0010] According to this solution, the valve core is maintained in the sealing position and resets to the self-conducting position through its own deformation ability, so that the leak detection joint can be switched between the open state and the closed state, which is convenient for sealing test of the endoscope. The valve core of the present application can replace the hydrophobic membrane, metal spring and detachable rubber cover in the prior art, thereby avoiding the problems of difficult sealing of the circumferential attachment of the hydrophobic membrane and easy clogging of the micropores, easy failure of the metal spring reset, and easy loss of the detachable rubber cover.

[0011] Optionally, the valve core is made of an elastomeric material.

[0012] According to this solution, the valve core has strong elastic deformation capability, longer service life, and is easy to be integrally injection molded.

[0013] Optionally, the valve core comprises a sealing portion for forming a seal with the valve channel and a deformable portion connected to the sealing portion, the deformable portion faces the closed end, and the deformable portion is provided with a deformable structure.

[0014] According to this solution, the columnar deformation part is structurally designed so that the deformation part has not only the deformation capacity of the material itself but also the deformation capacity brought by the structure. In this way, the deformation capacity of the valve core can be improved.

[0015] Optionally, the deformable structure includes a spring-like feature provided on an outer circumferential surface of the deformable portion and / or a blind hole extending from an end surface of the deformable portion along the axial direction of the valve channel.

[0016] According to this solution, by setting a spring-like feature, the valve core can have structural deformation ability and achieve reset sealing by relying on its own deformation; by setting a blind hole, the deformation part can have a thinner wall and be easily compressed and deformed.

[0017] Optionally, the valve channel has a limiting surface extending along the circumference of the valve channel, and the valve core has a sealing surface corresponding to the shape of the limiting surface, wherein when the valve core is located in the sealing position, the limiting surface is tightly fitted to the sealing surface.

[0018] According to this solution, the material of the valve core makes the valve core have sealing performance and can be directly sealed with the valve body in a face-to-face manner, which avoids the need for additional sealing rings, thereby simplifying the internal structure of the leak detection joint.

[0019] Optionally, at least a portion of the limiting surface forms an inclined surface or an arc surface facing the closed end, so that the limiting surface abuts against the sealing surface in the axial direction of the valve channel.

[0020] According to this solution, the limiting surface can be used to press against the valve core in the axial direction to limit the installation position of the valve core, so that the valve core can be kept in the valve body after installation.

[0021] Optionally, the valve core further includes a sealing portion for forming a seal with the valve passage and an access portion connected to the sealing portion. The access portion faces the intake end, and the size of the access portion in the cross-section is smaller than the size of the sealing portion in the cross-section.

[0022] According to this solution, a sufficient gap is formed between the small-sized access portion and the valve passage to facilitate access to the leak detection device.

[0023] Optionally, the valve body is provided with a mounting port at the closed end. The valve core is placed in the valve passage through the mounting port, and the mounting port is blocked by a valve cover. The valve core abuts against the valve cover.

[0024] According to this solution, the valve core is inserted from one side of the mounting port instead of from the side of the leak detection interface, which does not affect the seal between the valve core and the valve body.

[0025] Optionally, the valve cover is hermetically fixed at the mounting port by means of threading or gluing.

[0026] According to this solution, the installation process of the valve cover is simple, and the installation structure is easy to manufacture.

[0027] Optionally, the valve body is provided with a first valve passage extending in a first direction and a second valve passage extending in a second direction that forms an angle with the first direction. The first valve passage is formed between the intake end and the closed end, and the second valve passage is used to communicate with the inner cavity of the sleeve of the endoscope.

[0028] According to this solution, valve passages extending in different directions are provided to adapt to the structure of the endoscope itself, facilitating the assembly of the leak detection joint into the housing of the endoscope.

[0029] Optionally, the angle formed by the first direction and the second direction is 90°.

[0030] According to this solution, the two valve passages arranged at a right angle have a simple structure and are convenient for manufacturing.

[0031] Optionally, the valve body includes a hollow first valve body and a second valve body. The first valve body is provided with the intake end and the closed end on one side in the second direction, and an opening on the other side in the second direction. The second valve body extends into the interior of the first valve body from the side of the opening and covers the opening.

[0032] According to this solution, the valve body is split-type and can be manufactured more easily.

[0033] According to another aspect of the present application, an endoscope is provided. The endoscope includes the leak detection joint according to any one of the above aspects. Description of the Drawings

[0034] The following drawings of the present application are hereby incorporated as part of the present application for understanding the present application. The embodiments of the present application shown in the drawings and their descriptions are used to explain the principles of the present application.

[0035] In the drawings:

[0036] Figure 1 is a schematic structural diagram of a surgical robot according to the present application;

[0037] Figure 2 is a perspective view of an endoscope according to the present application;

[0038] Figure 3 is a perspective view of a leak detection joint according to the present application;

[0039] Figure 4 is Figure 3 another perspective view of the leak detection joint shown;

[0040] Figure 5 is Figure 3 a cross-sectional view of the leak detection joint shown;

[0041] Figure 6 is Figure 4 a front view of an example of a valve core shown in ;

[0042] Figure 7 is Figure 4 a front view of another example of a valve core shown in ;

[0043] Figure 8 is Figure 4 a front view of yet another example of a valve core shown in ;

[0044] Figure 9 is Figure 4 a front view of yet another example of a valve core shown in.

[0045] Explanation of reference numerals:

[0046] 1 Surgical robot 2 Control system

[0047] 3 Imaging system 4 Manipulator system

[0048] 5 Manipulator 6 Endoscope

[0049] 7 Connecting arm 8 Instrument support frame

[0050] 9 Leak detection joint 10 Valve body

[0051] 10a First valve body 10b Second valve body

[0052] 11 Intake end 12 Closed end

[0053] 13 Leak detection interface 14 Installation port

[0054] 15a First fixing part 15b Second fixing part

[0055] 16 Base part 17 Boss part

[0056] 18 Cylindrical part 21 Valve cover

[0057] 22 Sealing sleeve 30 Valve core

[0058] 31 Sealing part 32 Deformation part

[0059] 33 Access part 40 Deformable structure

[0060] 41 Spring-like feature 42 Blind hole

[0061] 50 Leak detection device 61 Housing

[0062] 62 Sleeve D1 First direction

[0063] D2 Second direction P1 Valve passage

[0064] P11 First valve passage P12 Second valve passage

[0065] F1 Limiting surface F2 Sealing surface Detailed implementation mode

[0066] In the following description, a large number of specific details are given to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0067] In order to thoroughly understand the present application, a detailed description will be presented in the following description. Obviously, the implementation of the embodiments of the present application is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application can also have other embodiments.

[0068] It should be noted that the terms used herein are only for describing specific implementation modes and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0069] Ordinal numbers such as "first" and "second" cited in this application are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" does not imply the existence of a "second component" by itself, and the term "second component" does not imply the existence of a "first component" by itself.

[0070] It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and similar expressions used herein are for illustrative purposes only and are not restrictive.

[0071] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concept of these exemplary embodiments is fully conveyed to those of ordinary skill in the art.

[0072] Existing medical devices may include, for example, Figure 1 the surgical robot 1 as shown, which is used to remotely manipulate and complete surgeries. The surgical robot 1 may include a control system 2, an imaging system 3, and a robotic arm system 4, and the three can communicate with each other.

[0073] The control system 2 is also called the doctor's console. The control system 2 has a display unit for displaying surgical instruments or the endoscopic environment, a control mechanism for the doctor to operate, armrests, etc. The display unit is provided with an observation window for the doctor to observe. The control mechanism is configured to perform various actions, and these actions correspond to the actions of surgical instruments or endoscopes. The armrests are used to place the doctor's arms. In addition, on the doctor's console, there are also other control switches that are convenient for the hands or feet to touch or press, used to perform various function operations and complete human-machine interaction.

[0074] The imaging system 3 has a display screen, an endoscope controller, system electronics, an image processor, etc. Thus, the patient's internal organs can be presented to the operator more clearly.

[0075] The robotic arm system 4 is arranged beside the patient, and a surgical instrument or an endoscope 6 is provided at its distal end, which is used to perform various surgical operations on the patient. The robotic arm system 4 may include at least one robotic arm 5, for example Figure 1Four robotic arms are schematically shown. The robotic arm 5 has a number of connecting arms 7. Two adjacent connecting arms 7 are pivotally connected and relatively movable with a specific degree of freedom, such that the end or distal end of the robotic arm 5 can achieve movement with multiple degrees of freedom, such as movement with seven degrees of freedom. An instrument support frame 8 is mounted at the end of the robotic arm 5, which can also be referred to as an instrument holding arm. A surgical instrument or an endoscope 6 is detachably mounted on the instrument support frame 8.

[0076] Figure 2 The external structure of the endoscope 6 is schematically shown. The endoscope 6 includes a housing 61 and a cannula 62. A part of the cannula 62 extends into the interior of the housing 61. A leak detection interface 13 of the endoscope 6 is exposed from the side of its housing 61. A leak detection device 50 can be docked to the leak detection interface 13 to perform a seal test on the endoscope 6.

[0077] Figures 3 to 5 The leak detection joint 9 of the present application is shown. The leak detection joint 9 is provided inside the housing 61 of the endoscope 6. The leak detection joint 9 includes a valve body 10, a valve core 30 and a valve cover 21. The valve body 10 is provided with an air inlet end 11, a closed end 12 and a valve passage P1 extending between the air inlet end 11 and the closed end 12. The air inlet end 11 forms the above-mentioned leak detection interface 13, and the closed end 12 is closed by the valve cover 21 to prevent the leakage of the medium. The valve core 30 is located in the valve passage P1 and is integrally deformable. Thus, the valve core 30 can be arranged to move due to deformation between a sealing position and a gas guiding position located in the valve passage P1. The valve core 30 forms a seal between the sealing position and the valve passage P1. At this time, the leak detection joint 9 is in a closed state, such that when the endoscope 6 is not subjected to a seal test, the valve core 30 located at the sealing position can prevent the medium inside the endoscope 6 from leaking from the leak detection interface 13. The valve core 30 forms a gas conduction path between the gas guiding position and the valve passage P1. At this time, the leak detection joint 9 is in an open state, such that when the endoscope 6 is subjected to a seal test, the test medium can enter the interior of the endoscope 6 from the leak detection interface 13.

[0078] In this article, the valve core 30 maintains itself at the sealing position and resets itself from the gas guiding position through its own deformation ability, such that the leak detection joint 9 can be switched between an open state and a closed state, facilitating the seal test of the endoscope 6. The valve core 30 in this article can replace the hydrophobic film, metal spring and detachable rubber cover in the prior art, thereby avoiding problems such as the large sealing difficulty of the circumferential attachment of the hydrophobic film, the easy blockage of micropores, the easy failure of the metal spring to reset, and the easy loss of the detachable rubber cover.

[0079] The valve core 30 is made of an elastomeric material, such that the valve core 30 has strong elastic deformation ability, longer service life, and is convenient for integral injection molding. The elastomeric material includes but is not limited to polyurethane and rubber, which can resist the corrosion of the disinfectant solution and realize the automatic closing of the leak detection interface 13. One example is that the valve core 30 is integrally injection molded through a silicone material.

[0080] In order to improve the deformation ability of the valve core 30, the deformable portion 32 is provided with a deformable structure 40. By designing the structure of the columnar deformable portion 32, the deformable portion 32 can have not only the deformation ability of the material itself but also the deformation ability brought by the structure. With such a setting, the deformation ability of the valve core 30 can be improved. The deformable structure 40 includes a spring-like feature 41 provided on the outer peripheral surface of the deformable portion 32. The spring-like feature 41 includes, for example, Figure 6 the spiral groove structure shown in Figure 7 the bellows-like groove structure shown in Figure 8 the concave arc structure shown in Figure 9 the trapezoidal groove structure shown in

[0081] Refer to Figure 5 , the deformable structure 40 further includes a blind hole 42 extending axially along the valve passage P1 from the end face of the deformable portion 32. The blind hole 42 extends to the connection of the deformable portion 32 with the sealing portion 31. Figure 5 Schematically shows that one blind hole 42 is provided, so that the deformable portion 32 forms a cylindrical shape. The purpose of providing the blind hole 42 is to make the deformable portion 32 have a thinner wall and be easily compressed and deformed.

[0082] The valve body 10 is provided with a first valve passage P11 extending along the first direction D1. In other words, the valve passage P1 includes the first valve passage P11. The first valve passage P11 is formed between the air inlet end 11 and the closed end 12. The valve core 30 is arranged in the first valve passage P11 along the first direction D1 and can move between a sealed position and a gas guiding position along the first direction D1. The valve core 30 includes a sealing portion 31 for forming a seal with the first valve passage P11, an access portion 33 connected to the sealing portion 31, and a deformation portion 32. A seal or a gas guiding passage is formed between the sealing portion 31 and the first valve passage P11. The access portion 33 is located on the side where the air inlet end 11 of the sealing portion 31 is located and faces the air inlet end 11. The joint of the leak detection device 50 can extend into and dock with the access portion 33 via the leak detection interface 13. The deformation portion 32 is located on the side where the closed end 12 of the sealing portion 31 is located and faces the closed end 12. Specifically, the end face of the deformation portion 32 faces the valve cover 21 located at the closed end 12. The deformation portion 32 has the ability to deform, enabling the valve core 30 to be held in the sealed position and reset from the gas guiding position.

[0083] When performing a seal test on the endoscope 6, the joint of the leak detection device 50 docks with the access portion 33 and pushes the valve core 30. The deformation portion 32 is deformed by the thrust force, and its dimension in the first direction D1 is reduced, causing the valve core 30 to move from the sealed position towards the gas guiding position. At this time, a gas guiding passage is formed between the sealing portion 31 and the valve passage P1. The test medium enters the leak detection joint 9 via the gas guiding passage and then enters the interior of the endoscope 6.

[0084] The access portion 33 can be configured in a columnar shape, such as a cylindrical shape, a square column shape, etc. The dimension of the access portion 33 in the cross-section is smaller than the dimension of the sealing portion 31 in the cross-section, so that a sufficient gap is formed between the small-sized access portion 33 and the valve passage P1 for accessing the leak detection device 50. With such a setting, the leak detection device 50 can be easily accessed to the leak detection interface 13. For the valve core 30 in a cylindrical shape, the diameter of the access portion 33 is smaller than the diameter of the sealing portion 31. At this time, the first direction D1 corresponds to the axial direction of the valve core 30. It should be noted that the "cross-section" refers to a section perpendicular to the first direction D1.

[0085] The valve passage P1 has a limiting surface F1 extending circumferentially along the valve passage P1, and the valve core 30 has a sealing surface F2 corresponding to the shape of the limiting surface F1. When the valve core 30 is in the sealing position, the limiting surface F1 is in close contact with the sealing surface F2. Specifically, when the valve core 30 is in the sealing position, the sealing surface F2 of the sealing portion 31 is in interference fit with the limiting surface F1 of the first valve passage P11 to achieve sealing. The material of the valve core 30 enables the valve core 30 to have a sealing performance and can be in direct surface-to-surface sealing with the valve body 10, which avoids the need to additionally provide a sealing ring, thereby simplifying the internal structure of the leak detection joint 9. The limiting surface F1 and the mating surface can be a cylindrical surface, an inclined surface or a conical surface, an arc surface or a partial spherical surface, a stepped surface extending along the first direction D1, or a combination of two or more of them.

[0086] In one example, at least a part of the limiting surface F1 forms an inclined surface or an arc surface facing the closed end 12, so that the limiting surface F1 abuts against the sealing surface F2 in the axial direction of the valve passage P1. Figure 5 The limiting surface F1 shown is an inclined surface facing the closed end 12. With such a setting, the limiting surface F1 can be used to abut against the valve core 30 in the axial direction, limit the installation position of the valve core 30, and enable the valve core 30 to be kept within the valve body 10 after installation.

[0087] The valve body 10 is provided with an installation port 14 at the closed end 12, and the valve core 30 is placed into the valve passage P1 through the installation port 14. The installation port 14 is blocked by the above-mentioned valve cover 21, and the deformation portion 32 of the valve core 30 abuts against the valve cover 21. Thus, the valve core 30 is clamped between the limiting surface F1 and the valve cover 21 when in the sealing position. In this article, the valve core 30 is inserted from one side of the installation port 14 instead of from one side of the leak detection interface 13, which does not affect the sealing between the valve core 30 and the valve body 10. The valve cover 21 is hermetically fixed at the installation port 14 by means of threads or bonding. The valve cover 21 can be integrally injection-molded from plastic.

[0088] The valve body 10 is further provided with a second valve passage P12 extending along a second direction D2 that forms an angle with the first direction D1. As described above, the first valve passage P11 is formed between the intake end 11 and the closed end 12. The second valve passage P12 is used to communicate with the inner cavity of the sleeve 62 of the endoscope 6. Different directions of extending valve passages P1 are provided herein to adapt to the structure of the endoscope 6 itself and facilitate the assembly of the leak detection joint 9 into the housing 61 of the endoscope 6. The included angle between the first direction D1 and the second direction D2 can be an acute angle, a right angle or an obtuse angle. Preferably, the included angle between the two is 90°. The two valve passages P1 arranged at a right angle have a simple structure and are convenient for production and manufacturing.

[0089] Specifically, the valve body 10 includes a hollow first valve body 10a and a second valve body 10b. The first valve body 10a forms a first valve passage P11 extending along a first direction D1. The first valve body 10a is provided with an air inlet end 11 and a closed end 12 on one side in a second direction D2, and forms a first valve passage P11 extending along the first direction D1. The first valve body 10a is provided with an opening on the other side in the second direction D2. The second valve body 10b extends into the interior of the first valve body 10a from the side of the opening and covers the opening. The valve body 10 in this text is a split type, which can be manufactured more easily. The valve body 10 is also provided with a sealing sleeve 22 (see Figure 5 ), so as to form a seal between the first valve body 10a and the second valve body 10b, so that the gap between the two valve bodies 10 can be sealed to avoid medium leakage. The sealing sleeve 22 is located inside the second valve body 10b.

[0090] As Figure 3 and Figure 4 shown, the first valve body 10a is provided with a first fixing portion 15a protruding outward, and the second valve body 10b is provided with a second fixing portion 15b corresponding to the position of the first fixing portion 15a in the second direction D2. The first fixing portion 15a can be fixedly connected to the second fixing portion 15b through fasteners such as screws.

[0091] Furthermore, the first valve body 10a includes a base portion 16, a boss portion 17, and a cylindrical portion 18. The base portion 16 is provided with the above-mentioned first fixing portion 15a and is sleeved outside the second valve body 10b. The boss portion 17 protrudes from the end face of the base portion 16 in the second direction D2, and the cylindrical portion 18 extends along the first direction D1 from the boss portion 17 and protrudes from the base portion 16. The cylindrical portion 18 has the above-mentioned air inlet end 11 and a leak detection interface 13, the boss portion 17 has a closed end 12, and the first valve passage P11 extends inside both the boss portion 17 and the cylindrical portion 18.

[0092] Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the technical field of this application. The terms used herein are only for the purpose of describing specific implementation purposes and are not intended to limit this application. The features described in one embodiment herein can be applied to another embodiment alone or in combination with other features, unless the feature is not applicable or otherwise stated in that other embodiment.

[0093] This application has been described through the above embodiments. However, it should be understood that the above embodiments are only for the purpose of illustration and example, and this application is not limited to the above embodiments. According to the teachings of this application, more variations and modifications can be made, and these variations and modifications all fall within the scope claimed by this application.

Claims

1. A leak detection joint for an endoscope, characterized in that, the leak detection joint comprises: a valve body having an air inlet end, a closed end, and a valve passage extending between the air inlet end and the closed end; and a valve core located in the valve passage, the valve core being configured to move due to deformation between a sealing position and a gas guiding position, wherein, the valve core forms a seal between the sealing position and the valve passage, and the valve core forms a gas guiding passage between the gas guiding position and the valve passage.

2. The leak detection joint according to claim 1, characterized in that, the valve core is made of an elastomeric material.

3. The leak detection joint according to claim 1, characterized in that, the valve core includes a sealing portion for forming a seal with the valve passage and a deformation portion connected to the sealing portion, the deformation portion faces the closed end, and the deformation portion is provided with a deformable structure.

4. The leak detection joint according to claim 3, characterized in that, the deformable structure includes a spring-like feature provided on the outer peripheral surface of the deformation portion and / or a blind hole extending axially along the valve passage from the end face of the deformation portion.

5. The leak detection joint according to claim 1, characterized in that, the valve passage has a limiting surface extending circumferentially along the valve passage, and the valve core has a sealing surface corresponding to the shape of the limiting surface, wherein when the valve core is in the sealing position, the limiting surface is in close contact with the sealing surface.

6. The leak detection joint according to claim 5, characterized in that, at least a part of the limiting surface forms an inclined surface or a curved surface facing the closed end, so that the limiting surface abuts against the sealing surface in the axial direction of the valve passage.

7. The leak detection joint according to any one of claims 1 to 6, characterized in that, the valve core further includes a sealing portion for forming a seal with the valve passage and an access portion connected to the sealing portion, the access portion faces the air inlet end, and the size of the access portion in the cross section is smaller than the size of the sealing portion in the cross section.

8. The leak detection joint according to any one of claims 1 to 6, characterized in that, the valve body is provided with an installation opening at the closed end, the valve core is placed in the valve passage through the installation opening, the installation opening is sealed with a valve cover, and the valve core abuts against the valve cover.

9. The leak detection joint according to claim 8, characterized in that, the valve cover is sealed and fixed at the installation opening by means of threading or gluing.

10. The leak detection joint according to any one of claims 1 to 6, characterized in that, the valve body is provided with a first valve passage extending in a first direction and a second valve passage extending in a second direction at an angle to the first direction, the first valve passage is formed between the air inlet end and the closed end, and the second valve passage is used for communicating with the inner cavity of the sleeve of the endoscope.

11. The leak detection joint according to claim 10, characterized in that, the included angle between the first direction and the second direction is 90°.

12. The leak detection joint according to any one of claims 1 to 6, characterized in that, The valve body includes a hollow first valve body and a second valve body. The first valve body is provided with the air inlet end and the closed end on one side in the second direction, and an opening on the other side in the second direction. The second valve body extends into the interior of the first valve body from one side of the opening and covers the opening.

13. An endoscope, characterized in that the endoscope includes a leak detection joint according to any one of claims 1 to 12.

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