Negative pressure suction valve and endoscope

Abstract

The utility model is suitable for the technical field of medical instruments, and provides a negative pressure suction valve and an endoscope. The negative pressure suction valve comprises a valve body, a valve element and a sealing structure, the valve body is provided with a valve cavity, a liquid inlet flow channel and a gas-liquid outlet, the liquid inlet flow channel and the gas-liquid outlet are communicated with the valve cavity, and the valve element is arranged in the valve cavity and moves relative to the valve body; a gap between the pressing end of the valve element and the valve body forms an air inlet flow channel, the valve element is provided with an air-liquid flow channel communicated with the air-liquid outlet, and the sealing structure is arranged in the valve cavity and connected to the valve element. In an initial state, the gas-liquid flow channel and the liquid inlet flow channel are separated by the sealing structure, and the gas inlet flow channel is communicated with the gas-liquid flow channel; and in a suction state, the sealing structure separates the gas-liquid flow channel from the gas inlet flow channel, and the liquid inlet flow channel is communicated with the gas-liquid flow channel. The relative position of the sealing structure in the valve cavity can be changed by pressing the valve element, and the operation difficulty is low; the same sealing structure abuts against different positions in the valve body, so that airtightness in two states can be achieved, and the structure is simple.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a negative pressure suction valve and an endoscope. Background Art

[0002] A medical endoscope is a medical detection instrument that can enter the patient's body through natural orifices and / or surgical incisions to examine cavities that are connected to the outside world (such as the digestive tract, respiratory tract, urinary tract, etc.) and closed cavities (such as the chest cavity, abdominal cavity, joint cavity, etc.). The endoscope in the related art is equipped with a negative pressure suction valve to suck out the objects to be sucked out of the patient's body, such as saliva, sputum and other effusions, and / or pathological samples such as pericardial effusion and pleural effusion. The negative pressure suction valve has an initial state connected to the atmosphere and a suction state for sucking the objects to be sucked out. However, the structure of the negative pressure suction valve in the related technical means is relatively complicated, which makes it inconvenient for medical staff to operate the negative pressure suction valve to achieve state switching. Utility Model Content

[0003] In view of this, the present invention provides a negative pressure suction valve and an endoscope to solve the technical problem of simplifying the structure of the negative pressure suction valve for easy operation.

[0004] To solve the above problems, the technical solution provided by the embodiment of the present utility model is implemented as follows:

[0005] A negative pressure suction valve is used to extract the material to be sucked out of the patient's body, comprising: a valve body, provided with a valve cavity and a liquid inlet channel and a gas-liquid outlet connected to the valve cavity; a valve core, arranged in the valve cavity; the valve core has a pressing end, and the gap between the pressing end and the valve body forms an inlet channel, and the valve core is provided with an gas-liquid channel connected to the gas-liquid outlet; a sealing structure, arranged in the valve cavity and connected to the valve core; the valve core moves relative to the valve body to switch between an initial state and a suction state, in the initial state, the sealing structure separates the gas-liquid channel from the liquid inlet channel, and the inlet channel is connected to the gas-liquid channel; in the suction state, the sealing structure separates the gas-liquid channel from the inlet channel, and the liquid inlet channel is connected to the gas-liquid channel.

[0006] In some embodiments, the sealing structure includes a first seal and a second seal arranged at intervals along the pressing direction, and the inlet of the gas-liquid flow channel is located between the first seal and the second seal; wherein, in the initial state, the second seal separates the liquid inlet flow channel and the gas-liquid flow channel; in the suction state, the first seal separates the gas inlet flow channel and the gas-liquid flow channel.

[0007] In some embodiments, the inner wall of the valve body is provided with a large-diameter portion and a small-diameter portion arranged in sequence along the pressing direction, in the initial state, the first sealing member is located in the large-diameter portion and spaced from the large-diameter portion, the second sealing member is at least partially located between the outlet of the liquid inlet channel and the inlet of the gas-liquid channel and abuts against the small-diameter portion; in the suction state, the first sealing member and the second sealing member at least partially abut against the small-diameter portion, the outlet of the liquid inlet channel is located between the first sealing member and the second sealing member and communicates with the inlet of the gas-liquid channel.

[0008] In some embodiments, the second sealing member includes a first sealing ring and a second sealing ring arranged in sequence along the pressing direction, in the initial state, the outlet of the liquid inlet channel is located between the first sealing ring and the second sealing ring; in the suction state, the outlet of the liquid inlet channel is located between the first sealing member and the first sealing ring.

[0009] In some embodiments, the valve body further includes a stop step arranged on the inner wall, the stop step is located at one end of the small-diameter portion close to the gas-liquid outlet in the axial direction; the valve core is provided with a limiting step, in the initial state, the limiting step abuts against the stop step in the axial direction, and the second sealing ring abuts against the small-diameter portion in the radial direction.

[0010] In some embodiments, the negative pressure suction valve further includes an elastic member abutting between the valve body and the valve core, the elastic member is used to drive the limiting step to move towards the direction close to the stop step.

[0011] In some embodiments, the valve core is provided with a first limiting portion and a second limiting portion, the first sealing member is clamped on the first limiting portion, and the second sealing member is clamped on the second limiting portion.

[0012] In some embodiments, the second sealing member further includes a body clamped with the second limiting portion, and the first sealing ring and the second sealing ring are spaced and protrude on the body along the pressing direction.

[0013] In some embodiments, the valve core includes a through hole opened in the radial direction, and the through hole forms the inlet of the gas-liquid channel; wherein the valve core is provided with a plurality of through holes, and each through hole is arranged in sequence in the circumferential direction of the valve core.

[0014] The utility model embodiment further provides an endoscope, including above-mentioned negative pressure suction valve, still include: main part has insertion part and operating part, negative pressure suction valve sets up operating part, liquid inlet channel and insertion part communicate, gas-liquid outlet is used for with negative pressure equipment communication, and in the suction state, export insertion part at the thing of suction is taken.

[0015] The utility model embodiment provides a kind of negative pressure suction valve and endoscope, the negative pressure suction valve includes valve body, valve core and sealing structure, valve body is equipped with valve cavity and the liquid inlet channel and gas-liquid outlet of intercommunication valve cavity, valve core is arranged in valve cavity, the gap between the pressing end of valve core and valve body forms air inlet channel, and valve core is equipped with the gas-liquid channel of intercommunication with gas-liquid outlet, sealing structure is arranged in valve cavity, and is connected on valve core.Valve core is moved relative to valve body to switch between initial state and suction state, in initial state, sealing structure separates gas-liquid channel and liquid inlet channel, air inlet channel and gas-liquid channel are communicated;In suction state, sealing structure separates gas-liquid channel and air inlet channel, liquid inlet channel and gas-liquid channel are communicated.Such setting, so that medical staff press valve core can drive sealing structure movement, to change the relative position of sealing structure in valve cavity, same sealing structure and the different position of abutment in valve body realize airtightness in two states, structure is simple, and the difficulty of medical staff operation negative pressure suction valve and realizes state switching is lower, it is easy to implement, and good use convenience. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the perspective view of negative pressure suction valve provided by the utility model embodiment;

[0017] Figure 2 It is the assembly view of negative pressure suction valve provided by the utility model embodiment;

[0018] Figure 3 It is the cross section view of negative pressure suction valve in initial state in direction A-A in Figure 1 ;

[0019] Figure 4 It is the cross section view of negative pressure suction valve in suction state in direction A-A in Figure 1 ;

[0020] Figure 5 It is the enlarged view of B in Figure 3 ;

[0021] Figure 6 It is the cross section view of valve core in direction A-A in Figure 1 ;

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] 1. Valve body; 11. Valve cavity; 12. Liquid inlet channel; 121. Outlet; 13. Gas-liquid outlet; 14. Large diameter portion; 15. Small diameter portion; 151. Sealing slope; 16. Stop step; 2. Valve core; 21. Pressing end; 22. Liquid inlet channel; 23. Gas-liquid channel; 231. Inlet; 24. Limiting step; 25. First limiting portion; 26. Second limiting portion; 201. Valve bonnet; 202. Valve stem; 3. Sealing structure; 31. First sealing member; 32. Second sealing member; 321. First sealing ring; 322. Second sealing ring; 323. Body; 4. Valve seat; 5. Elastic member. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The various specific technical features described in the specific embodiments may be combined in any suitable manner, unless they are inconsistent. For example, different embodiments and technical solutions may be formed by combining different specific technical features. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this utility model will not be described separately.

[0026] In the following description, the terms "first, second, etc." are used solely to distinguish different objects and do not imply any similarities or connections between the objects. It should be understood that the directions "above," "below," "outside," and "inside" refer to directions during normal use. The directions "left" and "right" refer to the left-right directions shown in the corresponding schematic diagrams, which may or may not be the left-right directions during normal use.

[0027] It should be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. "A plurality" means greater than or equal to two.

[0028] The present invention provides a negative pressure suction valve and an endoscope. The endoscope includes a negative pressure suction valve, which is used to extract material from a patient's body. The material to be extracted can be saliva, sputum, or other effusions, or pathological specimens such as pericardial effusions and pleural effusions. The specific type of material to be extracted is related to the actual application scenario of the endoscope. It should be noted that the application scenario of the endoscope in the present invention does not limit the specific structure of the negative pressure suction valve in the present invention.

[0029] Reference Figure 1 and Figure 2 The negative pressure suction valve comprises a valve body 1, a valve core 2 and a sealing structure 3. The valve body 1 is provided with a valve cavity 11 and a liquid inlet channel 12 and a gas-liquid outlet 13 communicating with the valve cavity 11, wherein the liquid inlet channel 12 is used to communicate with the insertion portion of the endoscope, and the gas-liquid outlet 13 is used to communicate with the negative pressure device; the valve core 2 is arranged in the valve cavity 11 and can move relative to the valve body 1, so that the negative pressure suction valve is in the initial state (such as Figure 3 shown) and suction status (as Figure 4 In the suction state, refer to Figure 4 The object to be sucked enters the negative pressure suction valve from the liquid inlet channel 12 and is discharged out of the negative pressure suction valve through the gas-liquid outlet 13. The valve core 2 has a pressing end 21 for receiving user pressure, and the gap between the pressing end 21 and the valve body 1 forms an inlet flow channel 22, and the valve core 2 has a gas-liquid flow channel 23 connected to the gas-liquid outlet 13. In the initial state, refer to Figure 3 The outside air enters the gas-liquid flow channel 23 of the negative pressure suction valve through the inlet flow channel 22 and is then discharged out of the negative pressure suction valve through the gas-liquid outlet 13. This arrangement utilizes the assembly gap between the valve body 1 and the valve core 2 as the inlet flow channel 22. The valve body 1 and / or valve core 2 do not need to be additionally formed with a through hole or a channel of a certain depth to serve as the inlet flow channel 22, thus reducing the structural design and processing difficulty of the valve body 1 and valve core 2.

[0030] In some possible embodiments, reference Figure 2 The valve core 2 includes a valve bonnet 201 and a valve stem 202. The pressing end 21 is provided on the valve bonnet 201. The sealing structure 3 is connected to the valve stem 202. The assembly gap between the valve bonnet 201 and the valve body 1 in the radial direction forms an inlet flow channel 22. The valve core 2 is provided as two components that can be processed separately, which is easier to process and form, so as to further reduce the difficulty of processing the valve core 2. It should be noted that the above-mentioned "radial" refers to the direction extending horizontally outward with the central axis of the valve body 1 as the center. It can be understood that the central axes of the valve body 1 and the valve core 2 are on the same straight line. Therefore, the radial direction of the valve body 1 and the radial direction of the valve core 2 are the same.

[0031] Reference Figure 3 and Figure 4The sealing structure 3 is arranged in the valve cavity 11 and connected to the valve core 2. The valve body 1 and the valve core 2 can be sealed by the sealing structure 3, so that there is no need to set up other direct contact sealing structures between the valve body 1 and the valve core 2, which reduces the processing accuracy and material accuracy of the valve body 1 and / or the valve core 2. Figure 3 In the initial state, the sealing structure 3 separates the gas-liquid flow channel 23 from the liquid inlet flow channel 12, and the inlet flow channel 22 is connected to the gas-liquid flow channel 23. The sealing structure 3 airtightly blocks the liquid inlet path in the negative pressure suction valve and opens the gas inlet path in the negative pressure suction valve. The atmospheric flow path in the initial state is: the inlet flow channel 22, the gas-liquid flow channel 23, and the gas-liquid outlet 13. The liquid inlet flow channel 12 is not connected to the gas-liquid flow channel 23 and no suction force is generated. Figure 4 In the suction state, the sealing structure 3 separates the gas-liquid flow channel 23 from the inlet flow channel 22, while the liquid inlet flow channel 12 communicates with the gas-liquid flow channel 23. The sealing structure 3 hermetically blocks the gas inlet path in the negative pressure suction valve and opens the liquid inlet path in the negative pressure suction valve. Suction is generated at the liquid inlet flow channel 12, and the material to be sucked flows sequentially through the liquid inlet flow channel 12, the gas-liquid flow channel 23, and the gas-liquid outlet 13, achieving suction and discharge of the material to be sucked. The gas-liquid flow channel 23 is isolated from the outside atmosphere without interfering with the negative pressure state within the negative pressure suction valve, resulting in high airtightness and increasing the suction volume per unit time of the negative pressure suction valve in the suction state. This arrangement allows the valve core 2 to move, driving the sealing structure 3 to abut different positions of the valve body 1, thereby enabling the negative pressure suction valve to switch between the initial state and the suction state. The structure is simple, and medical personnel can press the valve core 2 to change the relative position of the sealing structure 3 within the valve chamber 11, thereby achieving state switching of the negative pressure suction valve. This operation is relatively easy and convenient.

[0032] It should be noted that the valve body 1 can be directly connected to the negative pressure device, or can be connected to the negative pressure device through other components. For example, in some possible implementations, refer to Figure 2 The negative pressure suction valve also includes a valve seat 4, which is connected to the valve body 1. The valve body 1 is connected to the negative pressure equipment via the valve seat 4. The connecting structure for connecting to the negative pressure equipment can be set on the valve seat 4 to simplify the structure of the gas-liquid outlet 13 of the valve body 1 and reduce the processing difficulty of the valve body 1.

[0033] The utility model embodiment provides a kind of negative pressure suction valve, the negative pressure suction valve includes valve body 1, valve core 2 and sealing structure 3, valve body 1 is equipped with valve cavity 11 and the liquid inlet channel 12 and gas-liquid outlet 13 of intercommunication valve cavity 11, valve core 2 is arranged in valve cavity 11, valve core 2 has pressing end 21, and the gap between pressing end 21 and valve body 1 forms air inlet channel 22, and valve core 2 is equipped with the gas-liquid channel 23 being intercommunicated with gas-liquid outlet 13, sealing structure 3 is arranged in valve cavity 11, and is connected on valve core 2.Valve core 2 moves relative to valve body 1 to switch between initial state and suction state, in initial state, sealing structure 3 separates gas-liquid channel 23 and liquid inlet channel 12, air inlet channel 22 is communicated with gas-liquid channel 23;In suction state, sealing structure 3 separates gas-liquid channel 23 and air inlet channel 22, and liquid inlet channel 12 is communicated with gas-liquid channel 23.The structure of this arrangement, so that medical staff presses valve core 2 can drive sealing structure 3 movement and realize the switching of two states, and medical staff is lower in the difficulty of operating negative pressure suction valve to realize state switching, it is convenient to implement;Change the relative position of sealing structure 3 in valve cavity 11, i. e. sealing structure 3 and the different position of valve body 1 abut, and the same sealing structure 3 is respectively in initial state, and liquid inlet path is blocked in airtightness, in suction state, air inlet path is blocked in airtightness, structure is simple, two states do not interfere with each other, so that negative pressure suction valve can be compatible with different scene use, and negative pressure suction valve keeps airtight in suction state, and the suction amount in unit time is improved, and suction efficiency is higher.

[0034] In some embodiments, referring to Figure 3 And Figure 4 Sealing structure 3 includes first seal 31 and second seal 32 spaced apart along pressing direction, "pressing direction" can be understood as the direction that valve body 1 and valve core 2 are pressed in axial direction by user external force, "axial direction" indicates the direction of the central axis of valve body 1 and valve core 2, such as Figure 3 And Figure 4As shown, N1 represents the pressing direction, i.e., the axial midpoint of the valve body 1 and valve core 2 pointing downward. It should be understood that pressing direction N1 represents a collection of parallel lines, rather than a single line. The inlet 231 of the gas-liquid flow channel 23 is located between the first seal 31 and the second seal 32. In the initial state, the second seal 32 separates the liquid inlet channel 12 from the gas-liquid flow channel 23; in the suction state, the first seal 31 separates the inlet channel 22 from the gas-liquid flow channel 23. This embodiment of the utility model utilizes two seals for sealing in two different states. The first seal 31 and the second seal 32 are positioned specifically to correspond to the locations requiring sealing in each state. This ensures that the operation of the negative pressure suction valve in either the initial or suction state is not affected by the path in the other state. For example, in the suction state, the negative pressure suction valve is isolated from the atmosphere, preventing the outside atmosphere from affecting the negative pressure state within the valve. This facilitates maintaining an airtight seal in the suction state, thereby increasing the suction volume per unit time.

[0035] In some embodiments, reference Figure 3 and Figure 4 The inner wall of the valve body 1 is provided with a large-diameter portion 14 and a small-diameter portion 15, arranged sequentially along the pressing direction N1. It is understood that the large-diameter portion 14 is connected to the small-diameter portion 15, and the large-diameter portion 14 is located at the end facing away from the direction of the arrow in the pressing direction N1, while the small-diameter portion 15 is located at the end facing the direction of the arrow in the pressing direction N1. The inner diameter of the large-diameter portion 14 is larger than the inner diameter of the small-diameter portion 15, and a step surface is formed at the connection between the large-diameter portion 14 and the small-diameter portion 15. It should be noted that the "inner diameters of the large-diameter portion 14 and the small-diameter portion 15" refers to the diameter of the space enclosed by the inner walls of the large-diameter portion 14 and the small-diameter portion 15.

[0036] In the initial state, refer to Figure 3 The first seal 31 is located inside the large diameter portion 14 and is spaced apart from the large diameter portion 14. The second seal 32 is at least partially located (such as the first sealing ring 321) between the outlet 121 of the liquid inlet channel and the inlet 231 of the gas-liquid channel, and abuts the small diameter portion 15. The second seal 32 can be a structure as shown in the figure, and abuts the small diameter portion 15 at both ends of the liquid inlet channel 12. In this embodiment, it is considered that the second seal 32 partially abuts the small diameter portion 15. The second seal 32 can also be a sealing sleeve with a certain thickness, and the outer peripheral surface of the sealing sleeve completely abuts the small diameter portion 15. In this embodiment, it is considered that the second seal 32 completely abuts the small diameter portion 15. However, regardless of which of the above embodiments is used, the second seal 32 can separate the liquid inlet channel 12 from the gas-liquid channel 23 in the initial state, and separate the liquid inlet channel 12 from the gas-liquid outlet 13. No negative pressure is generated in the liquid inlet channel 12, and the object to be sucked will not be sucked, reducing the possibility of the object to be sucked accidentally entering in the initial state.

[0037] In the suction state, refer to Figure 4 The first seal 31 and the second seal 32 at least partially abut the small-diameter portion 15. The outlet 121 of the liquid inlet channel is located between the first seal 31 and the second seal 32 and communicates with the inlet 231 of the gas-liquid channel. That is, the outlet 121 of the liquid inlet channel communicates with the gas-liquid channel 23 above the second seal 32. The first seal 31 can be considered "partially abutted" by abutting the stepped surface connecting the large-diameter portion 14 and the small-diameter portion 15, or the first seal 31 can be considered "fully abutted" by being entirely disposed within the small-diameter portion 15. The second seal 32 can be considered "partially abutted" by having only the first sealing ring 321 abut the small-diameter portion 15; the second seal 32 can also be considered "fully abutted" by the small-diameter portion 15 below the liquid inlet channel 12. Regardless of which of the aforementioned embodiments is used, the first sealing member 31 can block the inlet flow channel 22 and the gas-liquid flow channel 23 in the suction state, hermetically isolating the air intake path from the outside atmosphere and maintaining the negative pressure state of the negative pressure suction valve. The liquid inlet flow channel 12 connects to the gas-liquid outlet 13 via the gas-liquid flow channel 23, introducing negative pressure, thereby enabling suction of the material to be sucked. Pressing the valve core 2 causes the two sealing members to abut different positions within the valve body 1 (large diameter portion 14 or small diameter portion 15) in different states, allowing the negative pressure suction valve to switch between the suction state and the initial state. This structure is simple and easy to implement.

[0038] In some embodiments, reference Figure 2 The second sealing member 32 includes a first sealing ring 321 and a second sealing ring 322 spaced apart along the pressing direction N1. In the initial state, as shown in FIG. Figure 3 As shown, the first sealing member 31 is inside the large diameter portion 14 and is radially spaced from the large diameter portion 14. After the atmosphere enters from the inlet flow channel 22, it passes through the radial space between the first sealing member 31 and the large diameter portion 14 and flows to the inlet 231 of the gas-liquid flow channel. The outlet 121 of the liquid inlet flow channel is located between the first sealing ring 321 and the second sealing ring 322. The outlet 121 of the liquid inlet flow channel is sealed by the first sealing ring 321 and the second sealing ring 322. Because the inlet 231 of the gas-liquid flow channel is above the second sealing member 32, when the first sealing ring 321 is above the outlet 121 of the liquid inlet flow channel, the inlet 231 of the gas-liquid flow channel is located above the outlet 121 of the liquid inlet flow channel, the liquid inlet flow channel 12 is separated from the gas-liquid flow channel 23, and no negative pressure is generated in the liquid inlet flow channel 12, so that the insert can be smoothly inserted or removed. Figure 4 In the suction state, the first sealing member 31 abuts against the small diameter portion 15 , the air intake path from the intake air duct 22 to the intake air duct 22 is blocked by the first sealing member 31 , and the gas-liquid flow channel 23 is separated from the outside atmosphere.

[0039] Reference Figure 3 and Figure 4When the negative pressure suction valve moves from the initial state to the suction state, the valve body 1 is pressed, and the first sealing ring 321 moves from above the outlet 121 of the liquid inlet channel to below the outlet 121 of the liquid inlet channel. The outlet 121 of the liquid inlet channel is located between the first sealing member 31 and the first sealing ring 321, and the inlet 231 of the gas-liquid channel is also located between the first sealing member 31 and the first sealing ring 321. The liquid inlet channel 12 and the gas-liquid channel 23 are connected in the sealed cavity between the first sealing member 31 and the first sealing ring 321. The liquid inlet channel 12 generates negative pressure, and the object to be sucked guided out of the liquid inlet channel 12 flows between the first sealing member 31 and the first sealing ring 321 to the inlet 231 of the gas-liquid channel, and is finally guided out of the gas-liquid outlet 13. Compared with the implementation method in which the second sealing member 32 is set as a sealing sleeve with a certain depth and abuts the small-diameter portion 15 in the initial state, the embodiment of the utility model divides the second sealing member 32 into a first sealing ring 321 and a second sealing ring 322 and partially abuts the valve body 1. While ensuring the airtightness of the liquid inlet channel 12 in the initial state, the contact area between the second sealing member 32 and the small-diameter portion 15 is reduced, so that when the negative pressure suction valve switches from the initial state to the suction state, the second sealing member 32 can move smoothly with the valve core 2.

[0040] In some embodiments, reference Figure 3 and Figure 5 The valve body 1 further includes a stop step 16 disposed on the inner wall. This stop step 16 is located at the end of the small-diameter portion 15 axially adjacent to the gas-liquid outlet 13, i.e., the stop step 16 is the lower end surface of the small-diameter portion 15. The valve core 2 includes a limiting step 24 that cooperates with the stop step 16. In the initial state, the limiting step 24 axially abuts the stop step 16 to limit the initial position of the valve core 2 and reduce the possibility of the valve core 2 separating from the valve body 1. The second sealing ring 322 radially abuts the small-diameter portion 15. It can be understood that, in the initial state, the second sealing ring 322 does not seal in the axial gap between the stop step 16 and the limiting step 24, that is, the second sealing ring 322 does not abut the lower end face of the small diameter portion 15 in the axial direction, but abuts the small diameter portion 15 in the radial direction. The stop step 16 is in direct contact with the limiting step 24, so that the stop step 16 limits the position of the limiting step 24. The valve core 2 is precisely limited in the initial state, so that the sealing structure 3 moves precisely to the corresponding position, thereby improving the air tightness of the liquid inlet channel 12 in the initial state and reducing the possibility of the object to be absorbed accidentally entering in the initial state.

[0041] In some possible embodiments, reference Figure 3 and Figure 5The small-diameter portion 15 has a sealing slope 151 near the stop step 16, i.e., the sealing slope 151 is located at the bottom of the small-diameter portion 15. The cross-sectional area of ​​the flow channel enclosed by the sealing slope 151 increases along the pressing direction N1. In the initial state, the second sealing ring 322 abuts the sealing slope 151, airtightly blocking the bottom of the liquid inlet channel 12. The setting of the sealing bevel 151 facilitates the smooth movement of the second sealing ring 322 with the valve core 2. For example, when the negative pressure suction valve switches from the suction state to the initial state, that is, when the valve core 2 moves from bottom to top, the second sealing ring 322 first passes through the part of the sealing bevel 151 with a larger flow channel cross-sectional area (the lower part of the sealing bevel 151). This part (the lower part of the sealing bevel 151) has a smaller blocking effect on the second sealing ring 322, so that the second sealing ring 322 can move upward smoothly; then, the second sealing ring 322 abuts against the part of the sealing bevel 151 with a smaller flow channel cross-sectional area (the upper part of the sealing bevel 151). This part (the upper part of the sealing bevel 151) achieves airtight abutment with the second sealing ring 322 to block the liquid inlet path of the negative pressure suction valve.

[0042] In some embodiments, reference Figure 3 and Figure 4 The negative pressure suction valve further includes an elastic member 5 abutting between the valve body 1 and the valve core 2. The elastic member 5 is used to drive the limiting step 24 toward the stop step 16, so that the valve core 2 automatically resets after being pressed, thereby automatically switching the negative pressure suction valve from the suction state to the initial state. The elastic force of the elastic member 5 automatically rebounds and drives the valve core 2 to automatically reset, achieving the automatic switching of the negative pressure suction valve from the suction state to the initial state, simplifying the process of medical personnel operating the negative pressure suction valve from the suction state to the initial state and facilitating operation.

[0043] Specifically, the elastic member 5 can be a spring, a rubber sleeve, etc. In the embodiment shown in the schematic diagram of the present application, Figure 2 , the elastic member 5 is configured as a compression spring. In the suction state, refer to Figure 4 , the elastic member 5 is in a compressed state; after the external force at the pressing end 21 is released, the elastic member 5 automatically rebounds and drives the valve core 2 to move upward, and the first sealing member 31 and the second sealing member 32 move upward with the valve core 2 until the limit step 24 abuts against the stop step 16, and the valve core 2 stops moving; at this time, refer to Figure 3 The first sealing member 31 moves from the small diameter portion 15 to the large diameter portion 14, the first sealing ring 321 in the second sealing member 32 moves from below the outlet 121 of the liquid inlet channel to above the outlet 121 of the liquid inlet channel, the second sealing ring 322 moves into the small diameter portion 15 and abuts against the small diameter portion 15 below the outlet 121 of the liquid inlet channel, and the negative pressure suction valve smoothly switches back to the initial state.

[0044] In some embodiments, reference Figure 6 The valve core 2 is provided with a first limiting portion 25 and a second limiting portion 26 . The first sealing member 31 is clamped on the first limiting portion 25 , and the second sealing member 32 is clamped on the second limiting portion 26 . Specifically, the first limiting portion 25 and the second limiting portion 26 can be a tongue and / or a groove. In the embodiment shown in the schematic diagram of the present application, the first limiting portion 25 and the second limiting portion 26 are both groove structures. Another rubber sleeve can be arranged between the first sealing ring 321 and the second sealing ring 322 to separate the first sealing ring 321 and the second sealing ring 322. The first sealing ring 321, the rubber sleeve and the second sealing ring 322 are stacked in sequence along the pressing direction N1 in the second limiting portion 26, so that the first sealing ring 321 and the second sealing ring 322 are clamped on the second limiting portion 26. The first sealing ring 321 and the second sealing ring 322 share a second limiting portion 26. There is no need to set the structure for clamping the first sealing ring 321 and the second sealing ring 322 one by one on the valve core 2, which further reduces the processing difficulty of the valve core 2.

[0045] In some embodiments, reference Figure 4 and Figure 6 The second sealing member 32 further includes a body 323 that engages with the second limiting portion 26. Along the pressing direction N1, the first sealing ring 321 and the second sealing ring 322 are spaced apart and protrude from the body 323. In other words, the first sealing ring 321, the second sealing ring 322, and the body 323 are integrally formed, and together, they constitute the second sealing member 32. Therefore, when disassembling the second sealing member 32, the first sealing ring 321 and the second sealing ring 322 can be disassembled and assembled in a single operation, allowing the various components of the second sealing member 32 to be assembled as a whole. This helps to reduce the difficulty of assembling the second sealing member 32 on the valve core 2.

[0046] In some embodiments, reference Figure 6 The valve core 2 includes a through hole opened in the radial direction, and the through hole forms the inlet 231 of the gas-liquid flow channel. The valve core 2 is provided with a plurality of through holes, and the through holes are arranged at intervals in the circumferential direction of the valve core 2. "Circumferential direction" refers to the direction of rotation around the central axis of the valve core 2. In other words, the gas-liquid flow channel 23 has a plurality of inlets 231, so in the suction state, refer to Figure 4 The object to be sucked, which is guided out from the outlet 121 of the liquid inlet channel, can enter the gas-liquid channel 23 at multiple positions in the sealed cavity formed between the first sealing member 31 and the first sealing ring 321, which is beneficial to increasing the suction amount of the negative pressure suction valve per unit time, thereby improving the suction efficiency of the endoscope.

[0047] The embodiment of the present invention also provides an endoscope, including the above-mentioned negative pressure suction valve, and the endoscope also includes a main body (not shown in the figure), the main body has an insertion part and an operating part, the insertion part is used to be inserted into the patient's body; the negative pressure suction valve is arranged on the operating part and is connected to the negative pressure device (such as a vacuum negative pressure machine, Vacuum Negative Pressure Machine) for receiving pressure and switching from the initial state to the suction state, and then extracting the object to be sucked at the insertion part in the suction state. By configuring the above-mentioned negative pressure suction valve, the endoscope provided by the embodiment of the present invention can airtightly block the air inlet path in the suction state, maintain the negative pressure state of the endoscope and suck the object to be sucked, thereby increasing the suction volume per unit time; the endoscope airtightly blocks the liquid inlet path in the initial state, maintains communication with the atmosphere without generating suction force, so that the insertion part of the endoscope can be smoothly inserted into the patient's body or pulled out of the patient's body.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A negative pressure suction valve for extracting the material to be sucked from the patient's body, characterized in that: include: The valve body is provided with a valve cavity and a liquid inlet channel and a gas-liquid outlet communicating with the valve cavity; A valve core is disposed in the valve cavity; the valve core has a pressing end, a gap between the pressing end and the valve body forms an inlet flow channel, and the valve core is provided with a gas-liquid flow channel connected to the gas-liquid outlet; A sealing structure is arranged in the valve cavity and connected to the valve core; the valve core moves relative to the valve body to switch between an initial state and a suction state. In the initial state, the sealing structure separates the gas-liquid flow channel from the liquid inlet flow channel, and the liquid inlet flow channel is connected to the gas-liquid flow channel; in the suction state, the sealing structure separates the gas-liquid flow channel from the inlet flow channel, and the liquid inlet flow channel is connected to the gas-liquid flow channel.

2. The negative pressure suction valve according to claim 1, characterized in that: The sealing structure includes a first sealing member and a second sealing member spaced apart along the pressing direction, and the inlet of the gas-liquid flow channel is located between the first sealing member and the second sealing member; Wherein, in the initial state, the second sealing member separates the liquid inlet flow channel and the gas-liquid flow channel; in the suction state, the first sealing member separates the liquid inlet flow channel and the gas-liquid flow channel.

3. The negative pressure suction valve according to claim 2, characterized in that: The inner wall of the valve body is provided with a large diameter portion and a small diameter portion arranged in sequence along the pressing direction. In the initial state, the first seal is located in the large diameter portion and spaced from the large diameter portion, and the second seal is at least partially located between the outlet of the liquid inlet channel and the inlet of the gas-liquid channel, and abuts the small diameter portion; in the suction state, the first seal and the second seal at least partially abut the small diameter portion, the outlet of the liquid inlet channel is located between the first seal and the second seal, and is connected to the inlet of the gas-liquid channel.

4. The negative pressure suction valve according to claim 3, characterized in that: The second sealing member includes a first sealing ring and a second sealing ring arranged at intervals along the pressing direction. In the initial state, the outlet of the liquid inlet channel is located between the first sealing ring and the second sealing ring; in the suction state, the outlet of the liquid inlet channel is located between the first sealing member and the first sealing ring.

5. The negative pressure suction valve according to claim 4, characterized in that: The valve body also includes a stop step arranged on the inner wall, and the stop step is located at one end of the small diameter portion axially close to the gas-liquid outlet; the valve core is provided with a limiting step, and in the initial state, the limiting step abuts the stop step axially, and the second sealing ring abuts the small diameter portion radially.

6. The negative pressure suction valve according to claim 5, characterized in that: The negative pressure suction valve further includes an elastic member abutting between the valve body and the valve core, and the elastic member is used for driving the limiting step to move in a direction close to the stopping step.

7. The negative pressure suction valve according to claim 4, characterized in that: The valve core is provided with a first limiting portion and a second limiting portion. The first sealing member is clamped on the first limiting portion, and the second sealing member is clamped on the second limiting portion.

8. The negative pressure suction valve according to claim 7, characterized in that: The second sealing member further includes a body engaged with the second limiting portion. Along the pressing direction, the first sealing ring and the second sealing ring are spaced apart and protrude from the body.

9. The negative pressure suction valve according to any one of claims 1 to 8, characterized in that: The valve core includes a through hole opened in the radial direction, and the through hole forms the inlet of the gas-liquid flow channel; wherein the valve core is provided with a plurality of through holes, and the through holes are arranged at intervals in the circumferential direction of the valve core.

10. An endoscope, characterized in that: The negative pressure suction valve according to any one of claims 1 to 9, further comprising: The main body has an insertion part and an operating part. The negative pressure suction valve is arranged on the operating part. The liquid inlet channel is connected with the insertion part. The gas-liquid outlet is used to connect with the negative pressure equipment and guide the object to be sucked at the insertion part in the suction state.

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