Suction valve assembly and endoscope

Abstract

The utility model discloses a suction valve assembly and an endoscope. The suction valve assembly comprises a valve body, a pressing piece, a moving piece, a first sealing piece and a second sealing piece. The valve body comprises a containing channel and a liquid inlet channel which communicate with each other. The liquid inlet channel comprises a liquid inlet and further communicates with a liquid outlet channel. The pressing piece is connected with the moving piece and the valve body. The moving piece is inserted into the containing channel and the liquid inlet channel and comprises a blocking part. The first sealing piece is connected with at least one of the moving piece and the channel wall of the containing channel. The second sealing piece is connected with one of the valve body and the plugging part. When the pressing piece is pressed, the moving piece moves relative to the valve body so that the liquid inlet can be opened by the blocking part, and in the moving process, the first sealing piece seals the containing channel; the pressing piece is loosened, the pressing piece resets and drives the plugging part to reset, and the second sealing piece seals the liquid inlet. Therefore, the suction valve assembly can guarantee good sealing in the pressing process, and a good suction effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to medical equipment, in particular to a suction valve assembly and an endoscope. BACKGROUND

[0002] The suction valve assembly as a component of the endoscope is connected with a negative pressure device. In this way, by pressing the suction valve assembly, the sputum or exuded blood in the body cavity and other liquids are extracted to the container of the negative pressure device through the channel inside the suction valve assembly under the action of the negative pressure device.

[0003] However, the skilled person finds that some existing suction valve assemblies have poor sealing performance during pressing, and the liquid leaks, and the suction effect is poor. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to disclose a suction valve assembly and an endoscope. The suction valve assembly can ensure good sealing during the entire pressing process, which is beneficial to reduce the risk of liquid leakage and achieve better suction effect.

[0005] The present application discloses a suction valve assembly. The suction valve assembly comprises a valve body, a pressing piece, a moving piece, a first sealing piece and a second sealing piece. The valve body comprises a containing channel and a liquid inlet channel which are connected in communication; the liquid inlet channel comprises a liquid inlet and is further connected with a liquid outlet channel. The pressing piece is connected with the moving piece and the valve body. The moving piece is inserted into the containing channel and the liquid inlet channel and comprises a blocking part. The first sealing piece is connected with at least one of the moving piece and the channel wall of the containing channel. The second sealing piece is connected with one of the valve body and the blocking part. When the pressing piece is pressed, the moving piece moves relative to the valve body to open the liquid inlet by the blocking part, and in the moving process, the first sealing piece seals the containing channel; when the pressing piece is released, the pressing piece resets and drives the blocking part to reset, and the second sealing piece seals the liquid inlet.

[0006] In some embodiments, when the moving piece is reset, the first sealing piece is sealingly connected with the moving piece and the channel wall of the containing channel.

[0007] In some embodiments, the first sealing piece comprises a sealing part, the sealing part comprises a containing cavity, the cavity opening side wall of the containing cavity is sealingly butted with the valve body to seal the containing channel, and the moving piece is connected with the inside of the containing cavity.

[0008] In some embodiments, the first sealing piece is integrally formed with the pressing piece.

[0009] In some embodiments, the first seal is sealingly penetrated by the moving member, and further comprises a sealing portion; when the moving member is in an initial position, the sealing portion is in interference fit with a channel wall of the accommodating channel; when the moving member moves relative to the valve body, the sealing portion moves with the moving member and moves on the channel wall of the accommodating channel.

[0010] In some embodiments, the moving member moves in a first direction to cause the blocking portion to open the liquid inlet; a cross-sectional width of the sealing portion gradually decreases along the first direction.

[0011] In some embodiments, the first seal comprises a deformed portion, which is directly connected with the sealing portion.

[0012] In some embodiments, the deformed portion is an annular groove around the first seal, and the annular groove and the sealing portion comprise a common side wall to achieve the direct connection.

[0013] In some embodiments, the first seal is sealingly fixed to a channel opening of the accommodating channel; the moving member penetrates and seals the first seal, and moves relative to the first seal.

[0014] In some embodiments, the first seal comprises a seal body and a reverse folded portion, which forms a barbed groove around the seal body with the seal body; a channel opening side wall of the channel opening is inserted into the barbed groove and sealingly connected with the reverse folded portion and the seal body.

[0015] In some embodiments, the seal body comprises a through hole, which comprises a middle hole and a flared portion at both ends of the middle hole; the moving member is in interference fit with a hole wall of the middle hole.

[0016] In some embodiments, the moving member comprises a first segment inserted into the accommodating channel and a second segment inserted into the liquid inlet; a diameter of the second segment is smaller than a diameter of the first segment to form a step at the intersection.

[0017] In some embodiments, the pressing member, the first seal and the second seal are made of silica gel.

[0018] The present application also discloses an endoscope. The endoscope comprises a suction tube, a negative pressure device and the suction valve assembly of any one of the preceding embodiments, the suction tube is connected with the liquid inlet; the negative pressure device is connected with the liquid outlet channel.

[0019] For the suction valve assembly and the endoscope, although the containing passage is in communication with the liquid inlet passage and the liquid outlet passage, the first sealing member seals the containing passage during the movement of the moving member relative to the valve body by pressing the pressing member, so that the suction valve assembly can ensure good sealing during the entire pressing process, the liquid sucked by the suction valve assembly can only flow from the liquid inlet passage to the liquid outlet passage and then into the container of the negative pressure device, thereby reducing the risk of liquid leakage (even without leakage), without large flow loss, and achieving good suction effect. Moreover, because the first sealing member seals the containing passage, there is no gas leakage, so the moving member does not make noise during movement. In summary, the use experience of the suction valve assembly is good. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a sectional view of the first suction valve assembly of the present application, showing that the first sealing member and the pressing member of the first type are integrally configured;

[0021] Figure 2 is Figure 1 is an enlarged view of part A in FIG. 4;

[0022] Figure 3 is a sectional view of the second suction valve assembly of the present application;

[0023] Figure 4 is Figure 3 is an enlarged view of part B in FIG. 5;

[0024] Figure 5 is a schematic view of the first sealing member of the second type of the present application;

[0025] Figure 6 is a sectional view of the third suction valve assembly of the present application;

[0026] Figure 7 is Figure 6 is an enlarged view of part C in FIG. 6;

[0027] Figure 8 is a schematic view of the first sealing member of the third type of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments (or “modes of implementation”) of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0029] If the application embodiments involve terms of direction indication or positional relationship (for example, up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, motion condition, etc. between components in a certain specific posture (as shown in the drawings); if the specific posture changes, the direction indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. in the application embodiments are only used for convenience of description, and cannot be understood as indicating or implying relative importance.

[0030] Referring to Figure 1 , Figure 3 and Figure 6 , Figure 1 A first suction valve assembly is disclosed, Figure 3 A second suction valve assembly is disclosed, Figure 6 A third suction valve assembly is disclosed. The three suction valve assemblies all include a valve body 1, a pressing member 2, a moving member 3, a first sealing member 4 and a second sealing member 5. The valve body 1 includes a containing channel 11 and a liquid inlet channel 12 connected in communication. The liquid inlet channel 12 includes a liquid inlet 121. The liquid inlet 121 is located at one end of the valve body 1 relative to the pressing member 2, and a connector 6 is connected to the end. A suction tube is connected through the connector 6, and the suction tube extends into a body cavity. The liquid inlet channel 12 is also connected in communication with a liquid outlet channel 13. The liquid outlet channel 13 is used to connect a negative pressure device. In the embodiments of the application, the liquid outlet channel 13 is formed in a liquid outlet pipe which is integrally formed with the valve body. In other embodiments, the liquid outlet channel 13 is formed in a liquid outlet pipe which is a separate component from the valve body 1. The liquid outlet pipe is assembled to the valve body 1.

[0031] The pressing member 2 is connected with the moving member 3 and the valve body 1. One function of the pressing member 2 is to move the moving member 3 relative to the valve body 1 when pressed, and to reset the moving member 3 when released. Therefore, how the pressing member 2 is connected with the moving member 3 and the valve body 1 is not limited, as long as the above functions can be achieved. The structure is not limited, for example, it can be made of silica gel material, in which case the pressing member 2 is a valve cap. In the case where the pressing member 2 is made of silica gel material, the hardness of the silica gel can be adjusted to adjust the feel of pressing, the stroke of the moving member 3, etc. The moving member 3 is inserted into the containing channel 11 and the liquid inlet channel 12, and includes a plugging part 30. The first sealing member 4 is connected with at least one of the moving member 3 and the channel wall of the containing channel 11, although as Figure 1 , Figure 3 and Figure 6The first seal 4 is connected to the moving part 3 and the passage wall 111, but the skilled person can understand that the connection can include the case that the first seal 4 is not connected to one of the moving part 3 and the containing passage 11 when the liquid inlet 121 is in the closed state, and in any case, as long as the first seal 4 seals the containing passage 11 during the movement of the moving part 3 relative to the valve body 1 caused by pressing the pressing part 2. Figure 1 、 Figure 3 and Figure 6 The second seal 5 is connected to the valve body 1 and is passed through by the moving part 3, in which case, when the pressing part 2 is pressed, the blocking part 30 of the moving part 3 is separated from the second seal 5 to make the second seal 5 open the liquid inlet 121. In another embodiment, the second seal 5 is connected to the blocking part 30, in which case, when the pressing part 2 is pressed, the blocking part 30 of the moving part 3 takes the second seal 5 away from the liquid inlet 121 to open the liquid inlet 121. In this application, the first seal 4 and the second seal 5 are both made of silica gel, but are not limited thereto.

[0032] The working process of the suction valve assembly is described as follows in combination with Figure 1 、 Figure 3 and Figure 6 : When the pressing part 2 is pressed, the moving part 3 moves relative to the valve body 1 in the first direction (downward in Figure 1 、 Figure 2 and Figure 1 ), and in the process of movement, the first seal 4 seals the containing passage 11. The movement of the moving part 3 makes the liquid inlet 121 be opened by the blocking part 30, so that under the action of the negative pressure device, the liquid in the body cavity is sucked out along the path of the suction tube→the liquid inlet 121→the liquid passage 12→the liquid outlet passage 13→the container of the negative pressure device. When the pressing part 2 is released, the pressing part 2 is reset and drives the blocking part 30 to reset, and the second seal 5 seals the liquid inlet 121. How the second seal 5 seals the liquid inlet 121 is described in the foregoing part of the arrangement of the second seal 5. The reset part of the pressing part 2 can be realized by a spring, or the pressing part 2 can be made of silica gel to realize reset by the elasticity of silica gel.

[0033] As set forth above, although the accommodation channel 11 is in communication with the liquid inlet channel 12, and the liquid inlet channel 12 is in communication with the liquid outlet channel 13, since the first sealing member 4 seals the accommodation channel 11 during the movement of the moving member 3 relative to the valve body 1 by pressing the pressing member 2, the suction valve assembly can ensure good sealing during the entire pressing process, and the liquid sucked by the suction valve assembly can only flow from the liquid inlet channel 12 to the liquid outlet channel 13, thereby reducing the risk of liquid leakage (even no leakage), without large flow loss, and achieving good suction effect. Furthermore, because the first sealing member 4 seals the accommodation channel 11, there is no gas leakage, and thus the moving member 3 does not make noise during movement. In summary, the user experience of the suction valve assembly is good.

[0034] In some embodiments, in the case of resetting of the moving member 3, the first sealing member 4 is sealingly connected with the moving member 3 and the channel wall of the accommodation channel 11.

[0035] As set forth above, in the case of resetting of the moving member 3, the first sealing member 4 is sealingly connected with the moving member 3 and the channel wall of the accommodation channel 11, at this time, the liquid inlet 121 is sealed by the second sealing member 5. In combination with the case where the liquid inlet 121 is opened, the first sealing member 4 seals the accommodation channel 11, that is, in the case of opening or blocking of the liquid inlet channel 12, the accommodation channel 11 is in a sealed state, thereby ensuring that the suction valve assembly ensures good sealing throughout the process, and the user experience is good.

[0036] As follows, embodiments for realizing that the suction valve assembly ensures good sealing during the entire process of pressing the pressing member 2 are described:

[0037] Referring to Figure 2 and Figure 1 , the first sealing member 4 comprises a sealing portion 41. The sealing portion 41 comprises an accommodation cavity 411, and a cavity wall 412 of a cavity opening of the accommodation cavity 411 is sealingly butted against the valve body 1 to seal the accommodation channel 11. In Figure 2 and Figure 1 , the channel wall 111 of the accommodation channel 11 of the valve body 1 is butted against the cavity opening side wall 412 of the accommodation cavity 411 to realize the sealing connection (including sealing by using glue), of course, other embodiments can also be adopted as long as the accommodation channel 11 can be sealed. After sealing the accommodation channel 11, liquid can only flow from the liquid inlet channel 12 to the liquid outlet channel 13. The moving member 3 is connected with the inside of the accommodation cavity 411, as Figure 2 and Figure 3The inner wall of the accommodating cavity 411 is provided with a clamping groove, and the moving piece 3 comprises a clamping portion 301 relative to the blocking portion 30. The clamping portion 301 is clamped with the clamping groove, so that the moving piece 3 is connected with the inside of the accommodating cavity 411.

[0038] As arranged above, the accommodating cavity 411 is formed by the sealing portion 41 of the first sealing piece 4, and the cavity opening side wall 412 of the accommodating cavity 411 is sealingly butted with the valve body 1 to realize the sealing of the accommodating channel 11. Therefore, the sealing of the suction valve assembly is realized in a simple structure regardless of whether the liquid inlet 121 is opened or blocked by the blocking portion 30. In addition, the moving piece 3 is inserted to realize the internal connection of the moving piece 3 and the accommodating cavity 411, and the assembly is simple.

[0039] In Figure 4 and Figure 5 , the first sealing piece 4 is integrally formed with the pressing piece 2.

[0040] As arranged above, the suction valve assembly has fewer components and is easier to assemble by being integrally formed.

[0041] Referring to Figure 4 , Figure 5 and Figure 3 , the first sealing piece 4 is sealingly penetrated by the moving piece 3. More specifically, the first sealing piece 4 comprises a through hole 42. The moving piece 3 penetrates the through hole 42 and is sealingly connected with the hole wall of the through hole 42, such as by glue or tight fitting. The first sealing piece 4 comprises a sealing portion 41. When the moving piece 3 is in the initial position, the sealing portion 41 is interference-fitted with the channel wall 111 of the accommodating channel 11. Thus, the accommodating channel 11 is sealed by interference-fitting with the sealing portion 41 in the case that the liquid inlet 121 is not opened by the blocking portion 30. In the case that the moving piece 3 moves relative to the valve body 1, the sealing portion 41 moves on the channel wall 111 of the accommodating channel 11 with the moving piece 3. Therefore, because the sealing portion 41 is interference-fitted with the channel wall, the sealing portion 41 is still sealed with the channel wall during the movement of the sealing portion 41.

[0042] As set forth above, by virtue of the sealing portion 41 being in interference fit with the passage wall of the accommodation passage 11 when the moving member 3 is in the initial position, sealing is achieved, and in conjunction with the sealing portion 41 moving over the passage wall during movement of the moving member 3, the suction valve assembly has good sealing performance due to the interference, regardless of whether the liquid inlet 121 is open or blocked by the blocking portion 30. Moreover, by adjusting the amount of interference, the feel of pressing can also be adjusted. Furthermore, because the sealing portion 41 is in interference fit with the passage wall of the accommodation passage 11 and the first sealing member 4 is penetrated by the moving member 3, the sealing portion 41 plays a supporting and guiding role on the moving member 3, preventing the moving member 3 from being skewed in the direction of the liquid outlet passage 13 during movement, which would affect the flow of liquid to the liquid outlet passage 13 and be detrimental to liquid discharge.

[0043] Referring to Figure 1 , Figures 3 to 5 and Figure 6 , the moving member 3 moves in a first direction to cause the blocking portion 30 to open the liquid inlet 121. The first direction is a downward direction in Figure 5 , Figure 5 and Figure 4 , as indicated by arrow A in the drawings. The width of the cross section of the sealing portion 41 gradually decreases along the first direction. The gradually decreasing structure is not limited, such as shown in Figure 5 , because the cross section of the accommodation passage 11 is circular, the sealing portion 41 is in the shape of a circular truncated cone, or a circular cone, etc.

[0044] As set forth above, because the width of the cross section of the sealing portion 41 gradually decreases along the first direction, during movement of the sealing portion 41 over the passage wall 111 with the moving member 3, the sealing portion 41 is in contact with the passage wall 111 more, thereby ensuring that the first sealing member 4 and the moving member 3 move smoothly, and the suction valve assembly has good sealing performance due to the more contact.

[0045] Referring to Figure 6 and Figure 7 , the first sealing member 4 includes a deformed portion 43, and the deformed portion 43 is directly connected with the sealing portion 41.

[0046] As set forth above, by virtue of the deformed portion 43, the sealing portion 41 is more easily deformed during movement of the moving member 3, thereby ensuring that the first sealing member 4 and the moving member 3 move smoothly and the feel of pressing is better under the premise of ensuring sealing performance. Based on the role of the deformed portion 43, the structure of the deformed portion 43 is not limited and can be a groove or the like, as long as the aforementioned role can be achieved.

[0047] Referring to Figure 8The deformation part 43 is a ring groove around the first sealing part 4, and the ring groove and the sealing part 41 have a common side wall to realize the direct connection.

[0048] As set forth above, the ring groove can provide deformation space for the sealing part 41, so that the sealing part 41 is easier to deform under the condition of ensuring sealing performance, and the hand feeling of pressing the pressing part 2 is better.

[0049] Referring to Figure 8 , Figure 7 and Figure 8 , the first sealing part 4 is sealingly fixed to the channel opening 122 of the containing channel 11, and the moving part 3 is penetratingly and sealingly arranged with the first sealing part 4 and moves relative to the first sealing part 4. How to realize the penetrating and sealing and the relative movement to the first sealing part 4 is not limited, for example, by interference.

[0050] As set forth above, due to the sealing connection of the first sealing part 4 and the channel opening 122, a first sealing is formed, and the moving part 3 is penetratingly and interferingly arranged with the first sealing part 4, forming a second sealing. Thus, whether the moving part 3 moves or not, the containing channel 11 is sealed, that is, the liquid inlet opening 121 is opened or blocked, and it will be sealed. Thus, the suction valve assembly has good sealing performance during the whole process of pressing the pressing part 2. Moreover, by adjusting the interference amount, the hand feeling of pressing can also be adjusted. In addition, because the first sealing part 4 is fixed to the channel opening 112 of the containing channel 11, and the moving part 3 is penetratingly arranged with the first sealing part 4, the first sealing part 4 plays a supporting and guiding role on the moving part 3, preventing the moving part 3 from being skewed in the direction of the liquid outlet channel 13 during movement. Skewing will affect the flow of liquid to the liquid outlet channel 13, which is not conducive to the discharge of liquid.

[0051] How the first sealing part 4 is sealingly fixed to the channel opening 122 of the containing channel 11 is not limited, for example, by plug-in to realize sealing fixation. As follows, an embodiment of realizing sealing fixation by plug-in is described: referring to Figure 8 , the first sealing part 4 includes a sealing part body 44 and a reverse folding part 45. The reverse folding part 45 and the sealing part body 44 form a barb groove 46 around the sealing part body 44. Referring to Figure 7 and in combination with Figures 1 to 4 , the channel opening side wall 1221 of the channel opening 122 is inserted into the barb groove 46 and sealingly connected with the reverse folding part 45 and the sealing part body 44. How to sealingly connect is not limited, for example, by glue sealing connection.

[0052] As described above, the barb groove 46 is inserted through the channel port side wall 1221 of the channel port 122 and sealed to the reverse fold 45 and the sealing body 44. On the one hand, the insertion makes the sealing good, and on the other hand, it can reliably fix the first sealing member 4 to the valve body 1.

[0053] See Figure 6 and Figure 7 The sealing body 44 includes a through hole 42. The through hole 42 includes a central hole 421 and flared openings 422 located at both ends of the central hole 421. The flared openings 422 are larger than the central hole 421. The moving member 3 is interference-fitted with the wall of the central hole 421.

[0054] As described above, by interfering with the wall of the intermediate hole 421, the movable part 3 is sealed to the hole wall during movement. Adjusting the amount of interference can adjust the feel of pressing the pressing part 2, etc. In addition, the flared opening 422 can guide the movable part 3 during assembly, facilitating its assembly.

[0055] See ​ as well as ​ and ​ The movable component 3 includes a first segment 31 inserted into the receiving channel 11 and a second segment 32 inserted into the liquid inlet 121. The diameter of the second segment 32 is smaller than the diameter of the first segment 31 to form a step 33 at the intersection.

[0056] As described above, since the first segment 31 and the second segment 32 are of different sizes, adjusting the size (length and / or diameter) ratio between the first segment 31 and the second segment 32 can regulate the flow rate. For example, a larger flow rate towards the liquid outlet channel 13 helps prevent leakage.

[0057] On the other hand, this application discloses an endoscope. The endoscope includes a suction tube, a negative pressure device, and a suction valve assembly as described in any of the foregoing, wherein the suction tube is connected to the inlet; and the negative pressure device is connected to the outlet channel.

[0058] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A suction valve assembly, characterized in that, The suction valve assembly includes a valve body, a pressing element, a moving element, a first seal, and a second seal. The valve body includes a receiving channel and a liquid inlet channel that are connected to each other; the liquid inlet channel includes a liquid inlet and is also connected to a liquid outlet channel; The pressing element is connected to the moving element and the valve body; The movable component is inserted into the receiving channel and the liquid inlet channel, including a sealing part; The first seal is connected to at least one of the movable member and the channel wall of the receiving channel; The second seal is connected to one of the valve body and the plug. Pressing the pressing member causes the moving member to move relative to the valve body so that the liquid inlet is opened by the sealing part. During the movement, the first sealing member seals the receiving channel. Releasing the pressing member resets the pressing member and drives the sealing part to reset, and the second sealing member seals the liquid inlet.

2. The suction valve assembly according to claim 1, characterized in that, When the movable part is reset, the first seal is sealed to the movable part and the channel wall of the receiving channel.

3. The suction valve assembly according to claim 2, characterized in that, The first sealing element includes a sealing portion, the sealing portion including a receiving cavity, the cavity opening sidewall of the receiving cavity sealingly abutting the valve body to seal the receiving channel; the moving element is connected to the interior of the receiving cavity; And / or, the first seal is integrally formed with the pressing member.

4. The suction valve assembly according to claim 2, characterized in that, The first seal is sealed through the movable member and also includes a sealing portion; when the movable member is in the initial position, the sealing portion is interference-fitted with the channel wall of the receiving channel; when the movable member moves relative to the valve body, the sealing portion moves along the channel wall with the movable member.

5. The suction valve assembly according to claim 4, characterized in that, The movable component moves in a first direction to open the liquid inlet of the sealing part; the width of the cross-section of the sealing part gradually decreases along the first direction.

6. The suction valve assembly according to claim 4 or 5, characterized in that, The first sealing element includes a deformable portion, which is directly connected to the sealing portion.

7. The suction valve assembly according to claim 6, characterized in that, The deformable portion is an annular groove that surrounds the first seal, and the annular groove and the seal share a common sidewall to achieve the direct connection.

8. The suction valve assembly according to claim 2, characterized in that, The first seal is fixedly and sealingly to the opening of the receiving channel; the movable member passes through and is sealed with the first seal, and is also movable relative to the first seal.

9. The suction valve assembly according to claim 8, characterized in that, The first sealing element includes a sealing element body and a reverse fold portion, wherein the reverse fold portion and the sealing element body form a barbed groove around the sealing element body; the side wall of the channel opening is inserted into the barbed groove and is sealed and connected to the reverse fold portion and the sealing element body. And / or, the sealing body includes a through hole, the through hole including a central hole and flared openings at both ends of the central hole; the moving member is interference-fitted with the wall of the central hole.

10. The suction valve assembly according to claim 1, characterized in that, The movable component includes a first segment inserted into the receiving channel and a second segment inserted into the liquid inlet; the diameter of the second segment is smaller than the diameter of the first segment to form a step at the intersection; And / or, the pressing element, the first seal, and the second seal are made of silicone.

11. An endoscope, characterized in that, The endoscope includes a suction tube, a negative pressure device, and a suction valve assembly as described in any one of claims 1 to 10, wherein the suction tube is connected to the inlet and the negative pressure device is connected to the outlet.

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