Suction valve and endoscope

Abstract

The application discloses an attraction valve and an endoscope, and belongs to the technical field of medical devices. The structure of the attraction valve comprises a valve body, a valve core, an elastic element and a valve rod. The valve core is movably arranged in the valve body, and the elastic element is connected with the valve body and the valve core. When the valve rod is pressed to switch the valve rod from a closed position to a suction position, the valve core moves along with the valve rod under the elastic force of the elastic element, so that the valve core and the blocking end of the valve rod are kept relatively sealed before the valve core reaches a second valve position, the communication between a connecting channel and a sample channel is disconnected, and the defects that the sample in the sample channel is scattered and pollutes the environment from the atmosphere channel and the sample channel is polluted are avoided.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and in particular relates to a suction valve and an endoscope. Background Technology

[0002] In some endoscopic applications, a negative pressure device is used to aspirate pathological samples from the patient for examination. The structure on the endoscope that uses this negative pressure device is a suction valve. This suction valve has two operating states: In the first state, the negative pressure channel is connected to the atmospheric channel, and the sample channel inside the suction valve is closed, thus stopping the aspiration of pathological samples; in the second state, pressing the suction valve closes the atmospheric channel and opens the sample channel, connecting it to the negative pressure channel, thereby enabling the aspiration of pathological samples.

[0003] However, in practical applications, pathological samples often remain in the atmospheric passage of the suction valve. These residual pathological samples can easily escape into the air, posing a risk of infection to personnel and environmental pollution. Summary of the Invention

[0004] This application aims to at least partially solve the technical problem that, during the switching process between two states of current suction valves, samples in the sample channel can easily escape from the atmospheric channel and pollute the environment. To this end, this application provides a suction valve and an endoscope.

[0005] An embodiment of this application provides an aspiration valve, characterized in that it includes: The valve body has an atmospheric passage, a negative pressure passage, and a sample passage; The valve core has a connecting channel and is movably located within the valve body to switch between a first valve position and a second valve position. The valve core is dynamically sealed to the valve body. When the valve core is in the first valve position, the connecting channel connects to the atmospheric channel and the negative pressure channel. When the valve core is in the second valve position, the valve core blocks the atmospheric channel to disconnect the connecting channel from the atmospheric channel. The elastic element connects the valve body and the valve core. The valve stem is movably located within the valve body to switch between the closed and suction positions, and the valve stem has a sealing end; When the valve stem is in the closed position, the sealing end of the valve stem seals with the valve core to disconnect the connection between the connecting channel and the sample channel, and stops the valve core in the first valve position through the sealing end, and the elastic element deforms to store energy. During the process of switching the valve stem from the closed position to the suction position, the valve core moves with the sealing end of the valve stem via the energy release of the elastic element to maintain the seal between the sealing end of the valve stem and the valve core until the valve core switches to the second valve position. When the valve stem is in the suction position, the sealing end of the valve stem is released from the valve core, so that the negative pressure channel can be connected to the sample channel through the connecting channel.

[0006] Optionally, in order to better realize this application, a limiting part is provided in the valve body. The limiting part is located on the movement path of the valve core. The elastic element drives the valve core to abut against the limiting part and moves the valve core to the second valve position.

[0007] Optionally, to better realize this application, the valve core includes a core body and a sealing body fixed on the core body. The core body can abut against the limiting part. The first end of the connecting channel is disposed on the sealing body and forms a first pair of interfaces. The sealing end of the valve stem seals and cooperates with the sealing body to seal the first pair of interfaces. The distance between the core body and the limiting part is less than or equal to the distance between the sealing body and the limiting part.

[0008] Optionally, in order to better realize this application, both the atmospheric passage and the negative pressure passage are located on the side wall of the valve body, and the distance between the atmospheric passage and the limiting part is greater than the distance between the negative pressure passage and the limiting part. The second end of the connecting channel is set on the core and forms a second pair of interfaces. When the valve core is in the first valve position, the second pair of interfaces connects to the atmospheric channel and the negative pressure channel at the same time. When the valve core is in the second valve position, the valve core blocks the atmospheric channel to disconnect the second pair of interfaces from the atmospheric channel. Alternatively, the second end of the connecting channel is set on the core body to form a third pair of interfaces and a fourth pair of interfaces. When the valve core is in the first valve position, the third pair of interfaces is connected to the atmospheric channel, and the fourth pair of interfaces is connected to the negative pressure channel. When the valve core is in the second valve position, the valve body blocks the third pair of interfaces to disconnect the connection between the third pair of interfaces and the atmospheric channel.

[0009] Optionally, to better realize this application, a limiting component is provided between the valve body and the valve core, which limits the movement path of the valve core during the switching process between the first valve position and the second valve position.

[0010] Alternatively, to better realize this application, both the atmospheric channel and the negative pressure channel are arranged in the circumference of the valve body, and the atmospheric channel and the negative pressure channel are arranged correspondingly.

[0011] Alternatively, to better realize this application, the limiting component is disposed in the circumferential direction of the valve body, and the limiting component is disposed opposite to either the atmospheric passage or the negative pressure passage.

[0012] Optionally, to better realize this application, a valve cap is fixed on the valve body. The valve cap is elastic, and the connecting end of the valve core is fixedly connected to the valve cap. The elasticity of the valve cap is greater than that of the elastic element.

[0013] Alternatively, to better realize this application, the elastic element is a spring, the valve body is provided with a first connecting part, the valve core is provided with a second connecting part, at least one of the first connecting part and the second connecting part is provided with an annular groove for positioning the spring, and the end of the spring is inserted into the annular groove accordingly.

[0014] This application also provides an endoscope, which includes a handle and the aforementioned suction valve, the suction valve being connected to the handle.

[0015] Compared with the prior art, this application has the following advantages: The suction valve provided in this application, by incorporating a valve core that can switch between a first valve position and a second valve position within the valve body, and an elastic element connecting the valve core and the valve body, allows the valve core to move along with the valve stem under the elastic force of the elastic element when the valve stem is pressed to switch from the closed position to the suction position. Thus, before the valve core reaches the second valve position, the sealing end of the valve core and the valve stem remains relatively sealed, disconnecting the connection between the connecting channel and the sample channel. This avoids the situation where the sample channel and the atmospheric channel are simultaneously connected during the suction valve pressing process, thereby preventing pathological samples in the sample channel from directly entering the atmospheric channel and adhering to it, and then being squeezed out of the atmospheric channel by pressing the suction valve, which could lead to personnel infection and environmental pollution. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the external structure of the suction valve is shown; Figure 2 A schematic diagram of the internal structure of the suction valve is shown; Figure 3 A schematic diagram of an suction valve structure is shown when the valve stem is in the closed position and the valve core is in the first valve position. Figure 4 A schematic diagram of the suction valve structure is shown when the valve core is in the second valve position; Figure 5 A schematic diagram of the suction valve structure is shown when the valve stem is in the suction position; Figure 6 The structural diagrams of the third and fourth pairs of interfaces are shown; Figure 7 It shows Figure 2 A magnified view of a portion of point A in the middle.

[0018] Figure label: 10-Suction valve; 100-Valve body; 101-Atmospheric passage; 102-Negative pressure passage; 103-Sample passage; 110-Limiting part; 120-First connecting part; 200-Valve core; 201-Valve cavity; 210-Core body; 220-Sealing body; 230-Connecting channel; 231-First pair of interfaces; 232-Second pair of interfaces; 233-Third pair of interfaces; 234-Fourth pair of interfaces; 240-Second connecting part; 241-Annular groove; 300-Elastic element; 400-Valve stem; 410-Blocking end; 420-Pressing end; 430-Guide hole; 500-Valve cap; 600-Limiting assembly; 610-Limiting groove; 620-Limiting strip. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0021] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0023] This application is described below with reference to the accompanying drawings and specific embodiments: The applicant's research revealed that the reason why pathological sample residue easily remains in the atmospheric channel after the negative pressure valve is applied to endoscopy and extracts pathological samples is that during the process of switching the suction valve's working state from the first state to the second state, the atmospheric channel is in a state of communication with the sample channel. In this state, pathological samples in the sample channel can directly enter the atmospheric channel and accumulate there through adhesion, causing residue. In particular, the aspirated material in a gas-liquid mixture is more likely to escape and accumulate in the atmospheric channel. The pathological sample remaining in the atmospheric channel is not easily drawn in by the negative pressure generated by the negative pressure channel. Therefore, when the suction valve is pressed, the pathological sample is easily squeezed out of the atmospheric channel and escapes into the air, causing problems such as personnel infection and environmental pollution.

[0024] In view of this, embodiments of this application provide a suction valve 10, the structure of which is as follows: Figure 1 and Figure 2 As shown, the suction valve 10 includes a valve body 100, a valve core 200, an elastic element 300, and a valve stem 400. The valve body 100 serves as the mounting base for the suction valve 10. The valve body 100 contains a valve cavity 201. An atmospheric channel 101, a negative pressure channel 102, and a sample channel 103 are provided on the surface of the valve body 100, and all three channels are connected to the valve cavity 201. During pressing, the suction valve 10 prevents the atmospheric channel 101 and sample channel 103 from being simultaneously connected, thereby preventing pathological samples in the sample channel 103 from directly entering and being adsorbed into the atmospheric channel 101. The internal structure of the suction valve will be described in detail below.

[0025] Please combine Figures 2 to 5 The valve core 200 is disposed in the valve cavity 201 within the valve body 100, and the valve core 200 is movable within the valve cavity 201, allowing it to switch between a first valve position and a second valve position. Furthermore, the valve core 200 and the cavity wall of the valve cavity 201 are dynamically sealed, ensuring a relative airtight seal between the valve core 200 and the valve body 100 during the switching process between the first and second valve positions. The dynamic sealing structure between the valve body 100 and the valve core 200 includes, but is not limited to, sealing rings, packing seals, and oil seals; this embodiment does not impose specific limitations on these methods.

[0026] The valve core 200 is provided with a connection channel 230, which has a first end and a second end. The first end can be used to connect to the sample channel 103, and the second end can be used to connect to the negative pressure channel 102 and the atmospheric channel 101. Figure 3 and Figure 6As shown, when the valve core 200 is in the first valve position, the second end of the connecting channel 230 simultaneously connects the atmospheric channel 101 and the negative pressure channel 102, so that the atmospheric channel 101 and the negative pressure channel 102 are connected within the connecting channel 230; as Figure 4 and Figure 5 As shown, when the valve core 200 is in the second valve position, the position of the valve core 200 within the valve body 100 changes. At this time, the atmospheric passage 101 is blocked by the side wall of the valve core 200, thereby causing the valve core 200 to disconnect the connection between the connecting passage 230 and the atmospheric passage 101, and making the second end of the connecting passage 230 only connected to the negative pressure passage 102, so that the atmospheric passage 101 and the negative pressure passage 102 cannot be connected within the connecting passage 230.

[0027] The elastic element 300 is an elastic component. Its two ends are connected to the valve body 100 and the valve core 200, respectively. When the valve core 200 is in the first valve position, the elastic element 300 has already deformed and stored elastic potential energy. During the process of releasing this elastic potential energy, the elastic element 300 provides a force to the valve core 200, causing the valve core 200 to move from the first valve position to the second valve position. Figure 4 and Figure 5 The driving force for the movement of the valve core 200 (located in the middle valve core).

[0028] It should be noted that in this embodiment, the elastic element 300 is entirely disposed within the valve cavity 201 of the valve body 100, so that the valve body 100 provides a certain degree of protection for the elastic element 300. Of course, in some alternative embodiments, a portion of the elastic element 300 may be disposed within the valve cavity 201 for connecting the valve core 200, while another portion of the elastic element 300 may be disposed outside the valve cavity 201 for connecting the valve body 100.

[0029] The valve stem 400 is a rod-shaped component with a sealing end 410 and a pressing end 420 at its two ends. The sealing end 410 and part of the stem body are located inside the valve body 100, and the valve stem 400 can move within the valve body 100 so that the valve stem 400 can switch between the closed position and the suction position.

[0030] like Figure 3As shown, when the valve stem 400 is in the closed position, the sealing end 410 of the valve stem 400 and the valve core 200 are sealed together, thereby sealing the first end of the connecting channel 230 by the sealing end 410 of the valve stem 400, thereby disconnecting the connection between the connecting channel 230 and the sample channel 103. At the same time, the stopping force of the sealing end 410 on the valve core 200 is greater than the elastic potential energy generated after the elastic element 300 is deformed, so that the sealing end 410 of the valve stem 400 will also stop the valve core 200, and so that the valve core 200 can be stopped by the sealing end 410 in the first valve position. The second end of the connecting channel 230 on the valve core 200 is connected to the atmospheric channel 101 and the negative pressure channel 102, thereby forming a fluid circuit between the negative pressure channel 102 and the atmospheric channel 101.

[0031] It should be noted that the valve stem 400 can be kept in the closed position by fixing the valve stem 400 to the valve body 100 or by manually holding the valve stem 400.

[0032] like Figure 4 As shown, the process of valve stem 400 switching from the closed position to the suction position is also the process of valve stem 400 moving from the blocking position to the suction position. During this process, the entire valve stem 400 will move, and the blocking end 410 of valve stem 400 will move in the direction of releasing the blockage of the first end of the connecting channel 230. In this embodiment, the direction in which the blocking end 410 of valve stem 400 releases the blockage of the first end of the connecting channel 230 is also the direction in which valve core 200 switches from the first valve position to the second valve position. During this process, the sealing end 410 of the valve stem 400 no longer stops the valve core 200 in the first valve position, thereby allowing the elastic element 300 to release elastic potential energy and drive the valve core 200 to move with the sealing end 410, so that the valve core 200 can move synchronously with the sealing end 410 of the valve stem 400. The valve core 200 can maintain a sealing fit with the sealing end of the valve stem 400 until the valve core 200 switches from the first valve position to the second valve position. Thus, during the process of switching the valve core 200 from the first valve position to the second valve position, the sealing end 410 of the valve stem 400 can still maintain the state of sealing the first end of the connecting channel 230. After the valve core 200 switches to the second valve position, the valve core 200 stops moving. At this time, the second end of the connecting channel 230 of the valve core 200 has been disconnected from the atmospheric channel 101, while the valve stem 400 has not yet reached the suction position. Therefore, as the valve stem 400 continues to switch to the suction position, the sealing end 410 of the valve stem 400 gradually separates from the valve core 200 and releases the sealing fit with the valve core 200, thereby making the first end of the connecting channel 230 of the valve core 200 connected to the sample channel 103.

[0033] It should be noted that, in order to ensure that the valve stem 400 does not reach the suction position after the valve core 200 switches to the second valve position, the stroke of the valve stem 400 from the suction position to the blocking position can be set to be greater than the stroke of the valve core 200 from the first valve position to the second valve position.

[0034] like Figure 5 As shown, when the valve stem 400 is in the suction position, the connecting channel 230 connects the negative pressure channel 102 and the sample channel 103, and disconnects the connection with the atmospheric channel 101.

[0035] When the aforementioned suction valve 10 is applied to an endoscope, the sample channel 103 of the suction valve 10 is connected to the human body through the endoscope, while the negative pressure channel 102 is connected to the negative pressure pump, and the atmospheric channel 101 is directly connected to the ambient air. When the valve stem 400 is in the blocked position, the negative pressure channel 102 and the atmospheric channel 101 are connected through the connecting channel 230, while the connecting channel 230 is disconnected from the sample channel 103. Therefore, gaseous substances in the patient's sample cannot escape into the ambient air through the atmospheric channel 101. During the process of switching the valve stem 400 from the closed position to the suction position, the connecting channel 230 remains disconnected from the sample channel 103. Therefore, during this process, gaseous substances in the patient's sample still cannot escape into the ambient air through the atmospheric channel 101, thus solving the defect in the prior art where the suction valve 10 is contaminated with pathological samples and the pathological samples contaminate the ambient air during the switching between the two states. When the valve stem 400 is in the suction position, the connecting channel 230 connects the negative pressure channel 102 and the sample channel 103, while the atmospheric channel 101 is disconnected from the connecting channel 230. This allows the negative pressure channel 102 to aspirate the patient's sample into a designated collection container, such as a special sample collection bottle, under the action of the negative pressure pump.

[0036] like Figure 2 and Figure 3 As shown, in this embodiment, a limiting part 110 is provided inside the valve body 100. The limiting part 110 is fixed to the valve body 100 and is located on the movement path of the valve core 200 when switching from the first valve position to the second valve position. During the process of switching from the first valve position to the second valve position, the valve core 200 will contact the limiting part 110, and the limiting part 110 will prevent the valve core 200 from continuing to move. At this time, the valve core 200 moves to the second valve position. The limiting part 110 can not only ensure that the valve core 200 can accurately reach the second valve position and stop moving, but also ensure that when the valve stem 400 continues to move, the sealing end 410 of the valve stem 400 can separate from the valve core 200.

[0037] Preferably, when the valve core 200 moves to the second valve position, under the action of the elastic potential energy of the elastic element 300, the elastic element 300 drives the valve core 200 to abut against the limiting part 110, thereby creating a preload between the valve core 200 and the limiting part 110, preventing separation between the valve core 200 and the limiting part 110. Simultaneously, due to the presence of the preload, even if the distance between the negative pressure channel 102 and the atmospheric channel 101 is set small, it can be ensured that after the valve core 200 moves to the second valve position, it will not separate from the limiting part 110, thus preventing the atmospheric channel 101 from connecting to the connecting channel 230. In this embodiment, the preload between the valve core 200 and the limiting part 110 is provided by the elastic element 300.

[0038] In this embodiment, the limiting part 110 is disposed within the valve cavity 201 of the valve body 100, and the limiting part 110 is one end of the valve cavity 201. This arrangement reduces the machining difficulty of the valve cavity 201 within the valve body 100. Of course, in some alternative embodiments, the limiting part 110 can also be a protruding member specifically disposed on the inner wall of the valve cavity 201. In addition, in this embodiment, since the valve core 200 is dynamically sealed to the cavity wall of the valve cavity 201, the limiting part 110 can also be configured as an annular protrusion, thereby increasing the contact area between the valve core 200 and the limiting part 110, and making the force distributed between the valve core 200 and the limiting part 110 more uniform after contact, reducing deformation and damage to the valve core 200.

[0039] Furthermore, the aforementioned valve core 200 includes a core body 210 and a sealing body 220. The core body 210 is dynamically sealed to the valve body 100. The sealing body 220 is fixed on the core body 210 and has elasticity. The first end of the connecting channel 230 is disposed on the sealing body 220 and forms a first pair of interfaces 231. The sealing end 410 of the valve stem 400 seals the first pair of interfaces 231. The elasticity of the sealing body 220 is used to achieve a sealing fit between the sealing end 410 of the valve stem 400 and the sealing body 220. After sealing the first pair of interfaces 231, the connection between the connecting channel 230 and the sample channel 103 is disconnected.

[0040] In this embodiment, the valve core 200 and the sealing body 220 are fixed by snap-fit. A groove and a protrusion are respectively provided between the valve core 200 and the sealing body 220. The elasticity of the sealing body 220 allows the protrusion to be embedded in the groove for fixation, facilitating the assembly of the valve core 200. Of course, in some alternative embodiments, the valve core 200 and the sealing body 220 can also be fixed by other methods such as adhesive bonding.

[0041] In this embodiment, the vertical distance between the core 210 and the limiting part 110 is less than or equal to the vertical distance between the sealing body 220 and the limiting part 110, so that when the valve core 200 reaches the second valve position, the core 210 in the valve core 200 can abut against the limiting part 110, while the sealing body 220 in the valve core 200 will not abut against the abutting part. This arrangement ensures that the elasticity of the sealing body 220 is not restricted by the limiting part 110, thereby preventing the sealing body 220 from pressing against the limiting part 110 and causing changes in the shape and size of the first pair of interfaces 231 on the sealing body 220, thus avoiding the defect that the sealing end 410 of the valve stem 400 cannot seal the first pair of interfaces 231.

[0042] In the valve body 100 provided in this embodiment, both the atmospheric channel 101 and the negative pressure channel 102 are disposed on the side wall of the valve body 100, while the sample channel 103 is disposed at one end of the valve body 100. The pressing end 420 of the valve stem 400 is disposed at the other end of the valve body 100, and the sealing end 410 of the valve stem 400 is disposed at the end near the sample channel 103. When the valve stem 400 switches from the closed position to the suction position, the valve stem 400 moves toward the end of the valve body 100 where the sample channel 103 is located. The side wall of the valve body 100 can be either an arc-shaped surface or a flat surface; this embodiment does not impose any specific limitations on this. By setting both the atmospheric passage 101 and the negative pressure passage 102 on the side wall of the valve body 100, the distance between the atmospheric passage 101 and the negative pressure passage 102 can be reduced. At the same time, when the valve core 200 moves within the valve body 100, the valve core 200 body can block the atmospheric passage 101 when it moves to the second valve position.

[0043] Furthermore, the vertical distance between the atmospheric channel 101 and the limiting part 110 is greater than the vertical distance between the negative pressure channel 102 and the limiting part 110. Here, the vertical distance between the atmospheric channel 101 and the limiting part 110 refers to the vertical distance between the end of the atmospheric channel 101 connected to the valve body 100 and the plane where the limiting part 110 is located; the vertical distance between the negative pressure channel 102 and the limiting part 110 refers to the vertical distance between the end of the negative pressure channel 102 connected to the valve body 100 and the plane where the limiting part 110 is located. Limiting the distances between the atmospheric channel 101 and the negative pressure channel 102 and the limiting part 110 respectively ensures that the distance between the atmospheric channel 101 and the sample channel 103 is greater than the distance between the negative pressure channel 102 and the sample channel 103. Since when the valve stem 400 is in the blocked position, the airflow enters the negative pressure channel 102 from the atmospheric channel 101, denoted as the first channel path (the first channel path is as follows...). Figure 3 (As shown by the guide arrow in the image); when the valve stem 400 is in the suction position, the sample enters the negative pressure channel 102 from the sample channel 103, denoted as the second channel path (the second channel path is shown in the image). Figure 5As shown by the guide arrow in the diagram, the first and second channel paths have very few overlapping path segments. Therefore, it is possible to reduce the amount of residual sample in the second channel path that is sucked into the negative pressure channel 102 after the sample channel 103 is closed.

[0044] Furthermore, such as Figure 4 As shown, the second end of the connecting channel 230 is disposed on the core 210 and forms a second pair of interfaces 232. When the valve core 200 is in the first valve position, the second pair of interfaces 232 simultaneously connects the atmospheric channel 101 and the negative pressure channel 102. When the valve core 200 is in the second valve position, the solid part of the valve core 200 blocks the atmospheric channel 101, thereby disconnecting the first pair of interfaces 231 from the atmospheric channel 101. With this configuration, only one second pair of interfaces 232 is needed to achieve simultaneous connection of the connecting channel 230 to the atmospheric channel 101 and the negative pressure channel 102, or to achieve connection of the connecting channel 230 only to the negative pressure channel 102. Accordingly, the shape of the second pair of interfaces 232 needs to be set according to the movement mode of the valve core 200 and the distance between the negative pressure channel 102 and the atmospheric channel 101.

[0045] Of course, in some alternative implementations, such as Figure 6 As shown, the second end of the connecting channel 230 is disposed on the core 210 and forms a third pair of interfaces 233 and a fourth pair of interfaces 234, which are connected inside the valve core 200. When the valve core 200 is in the first valve position, the third pair of interfaces 233 corresponds to the atmospheric channel 101 and is connected to the atmospheric channel 101, and the fourth pair of interfaces 234 corresponds to the negative pressure channel 102 and is connected to the negative pressure channel 102, thereby allowing the atmospheric channel 101 and the negative pressure channel 102 to be connected within the connecting channel 230 through the third pair of interfaces 233 and the fourth pair of interfaces 234. When the valve core 200 is in the second valve position, the third pair of interfaces 233 corresponds to the inner wall of the valve body 100 and is blocked by the inner wall of the valve body 100, thereby disconnecting the connection between the third pair of interfaces 233 and the atmospheric channel 101. This configuration requires an additional interface on the valve core 200, adding a corresponding process. In some alternative embodiments, when the valve core 200 is in the second valve position, the third interface 233 can be moved to a position corresponding to the negative pressure channel 102, so that the third interface 233 is connected to the negative pressure channel 102, while the atmospheric channel 101 is blocked by the solid part of the valve body 100, and the fourth interface 234 is blocked by the inner wall of the valve body 100. This also ensures that the connecting channel 230 is only connected to the negative pressure channel 102.

[0046] It should be noted that in this embodiment, the atmospheric channel 101 and the negative pressure channel 102 are close to each other and have a small distance between them, so as to reduce the aperture shape and size of the second pair of interfaces 232 or the fourth pair of interfaces 234 by reducing the distance between the atmospheric channel 101 and the negative pressure channel 102.

[0047] Furthermore, in this embodiment, as Figure 6 As shown, a limiting component 600 is provided between the valve body 100 and the valve core 200. The limiting component 600 limits the movement path of the valve core 200 during the switching process between the first and second valve positions, so that the valve core 200 can move along a preset movement path under the restriction of the limiting component 600 during the switching process, and the movement path of the valve core 200 will not deviate. Therefore, when the valve core 200 is in the first valve position, the connecting channel 230 on the valve core 200 can accurately communicate with the atmospheric channel 101 and the negative pressure channel 102. And when the valve core 200 is in the second valve position, the valve core 200 can accurately block the atmospheric channel 101. Especially when the valve cavity 201 of the valve body 100 and the outer wall of the core 210 of the valve core 200 are both cylindrical, the limiting component 600 can better limit the displacement of the valve core 200 caused by rotation.

[0048] In this embodiment, the limiting component 600 includes a limiting groove 610 and a limiting strip 620, which are respectively disposed on the valve core 200 and the valve body 100, and the limiting strip 620 is slidably installed in the limiting groove 610. Thus, the shape and length of the limiting groove 610 limit the limiting strip 620 and restrict the movement path of the valve core 200. Of course, in some other optional embodiments, the limiting component 600 may also employ a baffle and stop block cooperation structure or a gear and rack cooperation structure to limit the movement path of the valve core 200.

[0049] Furthermore, in this embodiment, both the atmospheric channel 101 and the negative pressure channel 102 are disposed circumferentially around the valve body 100, and the atmospheric channel 101 and the negative pressure channel 102 are correspondingly disposed. It can be understood that the atmospheric channel 101 occupies a position circumferentially around the valve body 100, designated as the first circumferential position. Therefore, the corresponding disposal of the atmospheric channel 101 and the negative pressure channel 102 means that the negative pressure channel 102 is also located in the first circumferential position, on the same circumferential position as the atmospheric channel 101. For a detailed structural description, please refer to [reference needed]. Figure 1The positional relationship between the atmospheric channel 101 and the negative pressure channel 102 is as follows: the atmospheric channel 101 and the negative pressure channel 102 are located on the same circumferential position of the valve body 100, and are spaced apart along the radial direction of the valve body 100. The limiting component 600 is also a linear limiting component 600, so that the valve core 200 moves linearly under the action of the linear limiting component 600, realizing the cooperation with the atmospheric channel 101 and the negative pressure channel 102. Of course, in some optional embodiments, the atmospheric channel 101 and the negative pressure channel 102 can also be located on different sides of the side wall of the valve body 100. In this case, the movement path of the valve core 200 when switching between the first valve position and the second valve position can be either a linear path or a spiral path. This embodiment does not impose specific limitations on this. When the movement path of the valve core 200 is a spiral path, the limiting groove 610 and the limiting strip 620 in the limiting component 600 can be set as corresponding spiral limiting grooves 610 and spiral limiting strips 620.

[0050] In this embodiment, when both the atmospheric channel 101 and the negative pressure channel 102 are located at the same circumferential position of the valve body 100, the limiting component 600 is located circumferentially on the valve body 100, and is positioned opposite to either the atmospheric channel 101 or the negative pressure channel 102. It can be understood that the position of the limiting component 600 circumferentially on the valve body 100 is the second circumferential position, with the first and second circumferential positions positioned opposite each other. With this configuration, during the movement of the valve core 200, it is constrained by the limiting component 600, and simultaneously driven by the elastic element 300. Therefore, when the valve core 200 moves towards the second valve position, it can exert greater compressive force on the side of the valve body 100 where the atmospheric channel 101 and the negative pressure channel 102 are located, thereby making the seal of the atmospheric channel 101 by the valve core 200 more tight.

[0051] In the aforementioned suction valve 10, when the valve stem 400 switches between the closed and suction positions, it can be switched from the closed to the suction position by pressing the pressing end 420 of the valve stem 400, and from the suction to the closed position by pulling the pressing end 420 of the valve stem 400. However, this operation method is rather cumbersome.

[0052] In this embodiment, a valve cap 500 is fixed to the valve body 100. The valve cap 500 is elastic, and the connecting end of the valve core 200 is fixedly connected to the valve cap 500. The elasticity of the valve cap 500 is greater than that of the elastic element 300, so that when the valve cap 500 releases its elastic potential energy, it can overcome the elastic potential energy of the elastic element 300 and drive the valve stem 400 to move towards the closed position, so that the sealing end 410 of the valve stem 400 can stop the valve core 200 in the first valve position. After the valve cap 500 is set, when the pressing end 420 of the valve stem 400 is not pressed, the valve stem 400 can automatically return to the closed position under the action of the valve cap 500, without the need for the operator to pull the valve stem 400 out to the closed position, thus reducing the operator's workload.

[0053] For the aforementioned elastic element 300, this embodiment uses a spring as the elastic element 300. For example... Figures 2-5 As shown, during installation, the spring can have a first connecting portion 120 on the valve body 100 and a second connecting portion 240 on the valve core 200. At least one of the first connecting portion 120 and the second connecting portion 240 has an annular groove 241 for positioning the spring. The end of the spring is inserted into the annular groove 241, which limits and fixes the end of the spring, thereby reducing the possibility of spring displacement during compression. Furthermore, the presence of the annular groove 241 also allows the spring to be connected to the first connecting portion 120 and the second connecting portion 240 by abutment. In some alternative embodiments, the elastic element 300 can also be a spring sheet, rubber strip, or similar material.

[0054] In this embodiment, an annular groove 241 is disposed on the second connecting portion 240 of the valve core 200. The second connecting portion 240 and the sealing body 220 on the valve core 200 are disposed opposite to each other at opposite ends of the valve core 200. The first connecting portion 120 is the end of the valve cavity 201, and the first connecting portion 120 and the limiting portion 110 are disposed opposite to each other at opposite ends of the valve cavity 201. The spring is axially sleeved on the valve stem 400, which also reduces the force on the valve core 200 when the spring is used as the elastic element 300, making the force more even.

[0055] In the valve stem 400 provided in this embodiment, a through hole 430 is provided on the stem body between the pressing end 420 and the sealing end 410 of the valve stem 400. The through hole 430 is set as an oblong hole along the length direction of the valve stem 400. When the valve stem 400 is in the suction position, part of the through hole 430 is located outside the valve core 200 and part is located inside the valve core 200. The through hole 430 realizes the communication between the inside and outside of the valve core 200 and the communication between the connecting channel 230 and the sample channel 103. Of course, in some optional embodiments, the diameter of the valve stem 400 can be reduced so that there is a gap between the valve stem 400 and the sealing body 220. When the valve stem 400 is in the suction position, the communication between the inside and outside of the valve core 200 can be realized by the gap alone or by the gap in combination with the oblong hole.

[0056] Based on the aforementioned suction valve 10, this embodiment also provides an endoscope, which includes a handle connected to the aforementioned suction valve 10, so as to connect the sample channel 103 of the suction valve 10 to the insertion tube of the endoscope via the handle. The handle is a component for the operator to hold, and the operator can press the valve stem 400 with their fingers while holding the handle. The endoscope in this embodiment can be a bronchoscope, pyeloscope, esophagoscope, gastroscope, colonoscope, nasal scope, oral scope, laryngoscope, colposcope, laparoscope, etc., and this embodiment does not specifically limit the type of endoscope.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

Claims

1. A suction valve for use in an endoscope, characterized in that, include: The valve body (100) has an atmospheric passage (101), a negative pressure passage (102) and a sample passage (103). A valve core (200) is provided with a connecting channel (230). The valve core (200) is movably disposed within the valve body (100) to switch between a first valve position and a second valve position. When the valve core (200) is in the first valve position, the connecting channel (230) connects the atmospheric channel (101) and the negative pressure channel (102). When the valve core (200) is in the second valve position, the valve core (200) blocks the atmospheric channel (101). An elastic element (300) connects the valve body (100) and the valve core (200). A valve stem (400) is movably disposed within the valve body (100) to switch between a closed position and a suction position; When the valve stem (400) is in the closed position, the sealing end (410) of the valve stem (400) is sealed to the valve core (200) to disconnect the connection between the connecting channel (230) and the sample channel (103), and the valve core (200) is stopped in the first valve position by the sealing end (410), and the elastic element (300) deforms to store energy. During the process of the valve stem (400) switching from the closed position to the suction position, the valve core (200) is driven by the release of energy of the elastic element (300) to move with the sealing end (410) of the valve stem (400) to maintain the seal between the sealing end (410) of the valve stem (400) and the valve core (200) until the valve core (200) switches to the second valve position; When the valve stem (400) is in the suction position, the sealing end (410) of the valve stem (400) is released from the seal with the valve core (200).

2. The suction valve according to claim 1, characterized in that, The valve body (100) is provided with a limiting part (110), which is located on the moving path of the valve core (200). The elastic element (300) drives the valve core (200) to abut against the limiting part (110) and moves the valve core (200) to the second valve position.

3. The suction valve according to claim 2, characterized in that, The valve core (200) includes a core body (210) and a sealing body (220) fixed on the core body (210). The core body (210) can abut against the limiting part (110). The first end of the connecting channel (230) is disposed on the sealing body (220) and forms a first pair of interfaces (231). The sealing end (410) of the valve stem (400) seals and cooperates with the sealing body (220) to seal the first pair of interfaces (231). The distance between the core body (210) and the limiting part (110) is less than or equal to the distance between the sealing body (220) and the limiting part (110).

4. A suction valve according to claim 3, characterized in that, The atmospheric channel (101) and the negative pressure channel (102) are both located on the side wall of the valve body (100), and the distance between the atmospheric channel (101) and the limiting part (110) is greater than the distance between the negative pressure channel (102) and the limiting part (110). The second end of the connecting channel (230) is disposed on the core (210) and forms a second pair of interfaces (232). When the valve core (200) is in the first valve position, the second pair of interfaces (232) simultaneously connects the atmospheric channel (101) and the negative pressure channel (102). When the valve core (200) is in the second valve position, the valve core (200) blocks the atmospheric channel (101). Alternatively, the second end of the connecting channel (230) is disposed on the core (210) and forms a third pair of interfaces (233) and a fourth pair of interfaces (234). When the valve core (200) is in the first valve position, the third pair of interfaces (233) is connected to the atmospheric channel (101), and the fourth pair of interfaces (234) is connected to the negative pressure channel (102). When the valve core (200) is in the second valve position, the valve body (100) blocks the third pair of interfaces (233).

5. A suction valve according to claim 1, characterized in that, A limiting component (600) is provided between the valve body (100) and the valve core (200), and the limiting component (600) limits the movement path of the valve core (200) during the switching process between the first valve position and the second valve position.

6. A suction valve according to claim 5, characterized in that, The atmospheric passage (101) and the negative pressure passage (102) are respectively arranged in the circumferential direction of the valve body (100).

7. A suction valve according to claim 6, characterized in that, In the circumferential direction of the valve body (100), the limiting component (600) is disposed opposite to either the atmospheric passage (101) or the negative pressure passage (102).

8. A suction valve according to claim 1, characterized in that, A valve cap (500) is fixed on the valve body (100). The valve cap (500) is elastic. The connecting end of the valve core (200) is fixedly connected to the valve cap (500). The elasticity of the valve cap (500) is greater than that of the elastic element (300). And / or, the valve core (200) is dynamically sealed to the valve body (100).

9. A suction valve according to claim 1, characterized in that, The elastic element (300) is a spring, the valve body (100) is provided with a first connecting part (120), the valve core (200) is provided with a second connecting part (240), at least one of the first connecting part (120) and the second connecting part (240) is provided with an annular groove (241) for positioning the spring, and the end of the spring is inserted into the annular groove (241).

10. An endoscope, characterized in that, Includes a handle and a suction valve (10) as described in any one of claims 1-9, wherein the suction valve (10) is connected to the handle.

Images