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 cap and a valve rod. A buffer space is defined between the pressing part of the valve cap and the pressing end of the valve rod, and an atmospheric channel is arranged on the pressing part of the valve cap to communicate with the buffer space. During pressing of the end of the pressing part, the pressing part is elastically deformed, the height of the buffer space in the pressing direction is reduced, and the atmospheric channel is pressed and blocked. Therefore, the atmospheric channel is blocked before the pressing force of the valve cap on the pressing end of the valve rod is generated. In the process of switching of the valve rod from the blocking position to the suction position, the atmospheric channel and the sample channel are simultaneously communicated, so that the pathological sample in the sample channel is prevented from directly adhering and remaining in the atmospheric channel and being squeezed out of the atmospheric channel due to the pressing of the attraction valve, and personnel infection and environmental pollution caused by the squeezing 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] During the use of an endoscope, a sampling device is used to obtain pathological samples from the patient for examination. A suction valve is used during sampling. The endoscope's suction valve has two operating states: in the first state, the negative pressure orifice is connected to the atmospheric vent, and the sample channel inside the suction valve is closed; in the second state, the negative pressure orifice is closed, and the sample channel is open and connected to the negative pressure orifice, thus enabling sample aspiration.

[0003] Currently, during the switching between the two states of the suction valve, both the atmospheric vent and the sample channel are open. This can cause pathological samples obtained from the patient to escape to the outside through the atmospheric vent, resulting in contamination of both the pathological samples and the ambient air. 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 a suction valve, comprising: The valve body has a valve cavity, and the valve body is provided with a negative pressure channel and a sample channel communicating with the valve cavity; A valve cap is fixed to the valve body. The valve cap has a pressing part, the circumferential sidewall of the pressing part is elastic, and an atmospheric passage is provided on the circumferential sidewall of the pressing part. The valve stem has a pressing end and a blocking end, the blocking end of the valve stem is movably disposed in the valve cavity so that the blocking end of the valve stem can switch between a closed position and a suction position, and a buffer space is defined between the pressing end of the valve stem and the valve cap, the buffer space being in communication with the atmospheric passage; The buffer space is located in the pressing direction of the suction valve, so that during the pressing of the end of the pressing part, the pressing part deforms to compress the buffer space and block the atmospheric passage, and the pressing part is configured to press against the pressing end of the valve stem after the atmospheric passage is blocked.

[0006] Optionally, in order to better realize this application, an annular sealing groove is provided on the circumferential sidewall of the pressing part, and the opening of the sealing groove is in communication with the buffer space. The pressing part is provided with an annular sealing body, which is located in the buffer space. The sealing body is spaced apart from the sealing groove. During the pressing process, the sealing body abuts against the pressing end and is inserted and limited in the sealing groove.

[0007] Optionally, to better realize this application, the circumferential sidewall of the pressing part is provided with a first annular protrusion, the first annular protrusion and the sealing end define the sealing groove, the sealing body is provided with a second annular protrusion, the second annular protrusion can be inserted into the sealing groove, and at least one of the side of the second annular protrusion that cooperates with the first annular protrusion or the side of the second annular protrusion that cooperates with the first annular protrusion is an arc surface.

[0008] Optionally, in order to better realize this application, the end of the pressing end of the valve stem is provided with a protruding guide portion, and the protrusion height of the guide portion gradually decreases from the center of the end of the pressing end to the edge of the pressing end. And / or, the sealing body is conical, and the distance between the sealing body and the axis of the sealing body gradually increases from one end of the sealing body connected to the pressing part to the other end of the sealing body.

[0009] Alternatively, to better realize this application, the atmospheric channel is an elliptical hole, and the minor axis of the atmospheric channel is parallel to the pressing direction.

[0010] Alternatively, to better realize this application, the buffer space is connected to the atmospheric passage through a connecting channel, which is disposed on the valve stem, or the connecting channel is disposed on the valve cap.

[0011] Optionally, to better realize this application, the connecting channel is disposed on the valve stem, the first end of the connecting channel is disposed on the pressing end of the valve stem, the second end of the connecting channel is disposed on the stem body of the valve stem, and the first end of the connecting channel is disposed opposite to the end of the pressing part.

[0012] Optionally, to better realize this application, the end of the pressing part is provided with a pressing groove, and the opening or bottom of the pressing groove is disposed opposite to the first end of the connecting channel.

[0013] Optionally, to better realize this application, the valve cap further includes a connecting portion, the two ends of which are respectively connected to the valve body and the pressing portion, the elastic modulus of the connecting portion is greater than the elastic modulus of the pressing portion, and the pressing end of the valve stem is fixed to the connecting portion.

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

[0015] Compared with the prior art, this application has the following advantages: The suction valve provided in this application includes a valve body, a valve cap, and a valve stem. By defining a buffer space between the pressing part of the valve cap and the pressing end of the valve stem, and by setting an atmospheric passage on the pressing part of the valve cap and connecting it to the buffer space, the pressing part undergoes elastic deformation during the pressing process, causing the height of the buffer space in the pressing direction to decrease. Simultaneously, the atmospheric passage is compressed and blocked. Thus, the atmospheric passage is blocked before the valve cap exerts pressure on the pressing end of the valve stem. This avoids the atmospheric passage and sample passage from simultaneously connecting during the switching of the valve stem from the blocked position to the suction position. This prevents pathological samples in the sample passage from directly reaching the atmospheric passage, adhering to residues, and being squeezed out of the atmospheric passage with the pressing of 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 overall structure of the suction valve is shown; Figure 2 It shows Figure 1 A schematic diagram of the internal structure of the suction valve after it has been cut open; Figure 3 It shows Figure 2 A schematic diagram of the cross-sectional structure of the valve stem; Figure 4 A schematic diagram of the suction valve with the valve stem in the plug position is shown. Figure 5 It shows Figure 4 A schematic diagram of the structure of the valve cap and the pressing end of the valve stem; Figure 6 This shows a schematic diagram of the suction valve when the valve cap is initially pressed; Figure 7 It shows Figure 6 A schematic diagram of the structure of the valve cap and the pressing end of the valve stem; Figure 8 A schematic diagram of the suction valve with its stem in the suction position is shown. Figure 9 It shows Figure 8A schematic diagram of the structure of the valve cap and the pressing end of the valve stem.

[0018] Figure label: 10 - Suction valve; 100 - Valve body; 110 - Valve cavity; 120 - Negative pressure channel; 130 - Sample channel; 140 - Sealing body; 141 - Straight hole; 200 - Valve stem; 210 - Pressing end; 211 - Guide part; 220 - Sealing end; 230 - Stem body; 231 - Connecting hole; 240 - Connecting channel; 241 - First end; 242 - Second end; 300-Valve cap; 310-Pressing part; 311-Buffer space; 312-Sealing groove; 313-Sealing body; 314-First annular protrusion; 315-Second annular protrusion; 317-Pressing groove; 320-Connecting part; 330-Atmospheric passage. 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, this application provides a suction valve 10, which can be installed on the handle of an endoscope and used in conjunction with the endoscope to extract samples from the human body through negative pressure. Furthermore, during the pressing process, the suction valve 10 can prevent the atmospheric channel 330 and the sample channel 130 from being simultaneously connected, thereby preventing pathological samples from the sample channel 130 from directly entering and remaining in the atmospheric channel 330. The internal structure of the suction valve will be described in detail below.

[0025] The structure of the suction valve 10 is as follows Figure 1 and Figure 2As shown, the valve includes a valve body 100, a valve cap 300, and a valve stem 200. The valve body 100 is the housing component of the suction valve 10, and has a valve cavity 110 inside, with an opening at the top. A negative pressure channel 120 and a sample channel 130 are provided on the outer wall of the valve body 100, both communicating with the valve cavity 110. Typically, the sample channel 130 is located at the bottom of the valve body 100, and the negative pressure channel 120 is located circumferentially around the valve body 100. A sealing body 140 is fixed inside the valve cavity 110 of the valve body 100. The sealing body 140 divides the negative pressure channel 120 and the sample channel 130 on both sides of the sealing body 140. The sealing body 140 has straight holes 141 penetrating both sides of the sealing body 140 (see...). Figure 8 This allows the negative pressure channel 120 and the sample channel 130 to be connected through the straight hole 141.

[0026] The valve cap 300 is fixed to the valve body 100 and is located at the top of the valve body 100. In this embodiment, the valve cap 300 is fixed to the valve body 100 by snap-fit. Of course, in some alternative embodiments, adhesive bonding or other fixing methods can also be used. The valve cap 300 has a pressing part 310, one end of which faces the valve body 100 and the other end faces away from the valve body 100. The circumferential sidewall of the pressing part 310 is located between the two ends of the pressing part 310. The end of the pressing part 310 facing away from the valve body 100 is for the operator to press. An atmospheric channel 330 is provided on the circumferential sidewall of the pressing part 310. This atmospheric channel 330 can be achieved by opening a hole in the circumferential sidewall of the pressing part 310. The circumferential sidewall of the pressing part 310 is made of an elastic material, such as rubber or silicone, to make the circumferential sidewall of the pressing part 310 elastic. After being pressed, the pressing part 310 can undergo elastic deformation, and during the elastic deformation process, the atmospheric channel 330 is compressed until the atmospheric channel 330 is blocked due to the compression deformation. After the pressing part 310 is released, it can be restored to the shape before being pressed through elastic potential energy, and the atmospheric channel 330 is also restored to the connected state.

[0027] The valve stem 200 is a rod-shaped structure with a pressing end 210 and a blocking end 220 at opposite ends, and the stem body 230 between the pressing end 210 and the blocking end 220. The blocking end 220 of the valve stem 200 is placed inside the valve cavity 110 of the valve body 100, while the stem body 230 and the other end of the valve stem 200 extend outside the valve body 100 from the top opening of the valve cavity 110. The valve stem 200 can move relative to the valve body 100, allowing the blocking end 220 to move within the valve cavity 110, enabling the valve stem 200 to switch between the blocking and suction positions. When the valve stem 200 is in the blocking position, the sample channel 130 needs to be closed, and the negative pressure channel 120 needs to be connected to the atmospheric channel 330, so that the sample in the sample channel 130 cannot be suctioned into the negative pressure channel 120. When the valve stem 200 is in the suction position, the atmospheric passage 330 needs to be closed, and the negative pressure passage 120 needs to be connected to the sample passage 130 so that the sample in the sample passage 130 can be suctioned into the negative pressure passage 120. The sealing end 220 of the valve stem 200 can both seal and open the sample passage 130.

[0028] Specifically, the stem 230 of the valve stem 200 is placed in the straight hole 141 of the sealing body 140, so that the pressing end 210 and the sealing end 220 of the valve stem 200 are located on both sides of the sealing body 140, respectively. When the sealing end 220 of the valve stem 200 moves towards the direction of the pressing end 210, the sealing end 220 of the valve stem 200 cooperates with the sealing body 140 to seal the sample channel 130, thereby disconnecting the connection between the negative pressure channel 120 and the sample channel 130. When the sealing end 220 of the valve stem 200 moves away from the direction of the pressing end 210, the sealing end 220 of the valve stem 200 disengages from the sealing body 140, thereby preventing the sample channel 130 from being blocked by the valve stem 200, and allowing the negative pressure channel 120 and the sample channel 130 to connect. In this embodiment, the diameter of the valve stem 230 can be set to be smaller than the diameter of the straight hole 141, so that there is a gap between the valve stem 230 and the straight hole 141 to connect the sample channel 130 and the negative pressure channel 120. Alternatively, the valve stem 200 can be provided with... Figure 2 The connection hole 231 is used to connect the sample channel 130 and the negative pressure channel 120. This embodiment does not impose specific limitations on this.

[0029] A buffer space 311 is defined between the pressing end 210 of the valve stem 200 and the valve cap 300. This buffer space 311 is connected to the atmospheric passage 330 and is located in the pressing direction of the suction valve 10, which is also the pressing direction of the pressing part 310 of the valve cap 300. The pressing direction of the pressing part 310 is the direction of movement of the end of the pressing part 310 during the pressing process. During this pressing process, the circumferential sidewall of the pressing part 310 undergoes elastic deformation, and the height of the buffer space 311 in the pressing direction is compressed during the deformation. During the compression of the buffer space 311, the atmospheric passage 330 is also blocked due to the deformation of the circumferential sidewall of the pressing part 310. After the atmospheric passage 330 is blocked, the pressing part 310 abuts against the pressing end 210 of the valve stem 200 and pushes the pressing end 210 of the valve stem 200 to move in the direction of the blocking end 220 of the valve stem 200, that is, pushes the valve stem 200 to switch from the closed position to the suction position.

[0030] It should be noted that since the valve cap 300 is fixed to the valve body 100, the deformation process of the pressing part 310 of the valve cap 300 after being pressed will have two stages. The first stage is the initial deformation process, such as... Figure 6 and Figure 7 As shown, during this stage, the pressing force on the pressing part 310 is entirely used to deform the pressing part 310, and the shape of the atmospheric channel 330 also deforms accordingly and is compressed. During this stage, the atmospheric channel 330 on the pressing part 310 is blocked. After this stage, when entering the second stage, as... Figure 8 and Figure 9 As shown, the pressing part 310 contacts the valve stem 200, so that the pressing force on the pressing part 310 is applied to the valve stem 200, causing the valve stem 200 to move. Before the valve stem 200 switches from the closed position to the suction position, the atmospheric passage 330 has been blocked by the pressing part 310. Therefore, during the switching process of the valve stem 200 from the closed position to the suction position, the atmospheric passage 330 is also in a blocked state and is not connected to the valve chamber 110. Thus, it is possible to avoid both the atmospheric passage 330 and the sample passage 130 being in an open state.

[0031] Combination Figures 3 to 9When the suction valve 10 is applied to an endoscope, the sample channel 130 of the suction valve 10 is connected to the human body through the endoscope, while the negative pressure channel 120 is connected to the negative pressure pump, and the atmospheric channel 330 is directly connected to the ambient air. When the valve stem 200 is in the blocked position, the negative pressure channel 120 and the atmospheric channel 330 are connected through the valve cavity 110. The sealing fit between the blocking end 220 of the valve stem 200 and the blocking body 140 prevents the sample channel 130 from connecting with the atmospheric channel 330 and the negative pressure channel 120. This prevents gaseous substances in the patient's body sample from entering the atmospheric channel 330 through the sample channel 130 and escaping into the ambient air through the atmospheric channel 330. After applying pressure to the end of the pressing part 310 of the valve cap 300, during the process of switching the valve stem 200 from the closed position to the suction position, the pressing part 310 first undergoes elastic deformation, causing the atmospheric passage 330 to be compressed and blocked. Then, the pressing pressure received by the pressing part 310 will act on the pressing end 210 of the valve stem 200, causing the valve stem 200 to switch from the closed position to the suction position. Since the atmospheric passage 330 has been blocked before the valve stem 200 moves, the atmospheric passage 330 cannot be connected to the sample passage 130 during the switching process of the valve stem 200 from the closed position to the suction position. This solves 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 process between the two states. When the valve stem 200 is in the suction position, the atmospheric passage 330 is still compressed and blocked. However, the blocking end 220 of the valve stem 200 releases the blockage of the sample passage 130, allowing the sample passage 130 to connect with the valve chamber 110, and then connecting the sample passage 130 with the negative pressure passage 120. The negative pressure passage 120 can draw the sample from the patient's body into a designated collection container, such as a special sample collection bottle, under the action of the negative pressure pump.

[0032] In addition, it should be noted that in this embodiment, the atmospheric channel 330 is set on the valve cap 330, which is located at one end of the valve body 100, while the sample channel 130 is set at the other end of the valve body 110. This results in a larger distance between the atmospheric channel 330 and the sample channel 130, making it more difficult for pathological samples in the sample channel 330 to reach the atmospheric channel 330.

[0033] like Figure 5 , Figure 7 and Figure 9As shown, further, an annular sealing groove 312 is provided on the circumferential sidewall of the pressing part 310. The sealing groove 312 is disposed on the wall surface of the buffer space 311, and the opening of the sealing groove 312 communicates with the buffer space 311. An annular sealing body 313 is provided on the pressing part 310. The sealing body 313 is located in the buffer space 311 and is elastic. Before pressing the pressing part 310, the sealing body 313 and the sealing groove 312 are spaced apart. During the pressing process of the pressing part 310, the sealing body 313 abuts against the pressing end 210. After abutting against the pressing end 210, it moves along the end face of the pressing end 210 and inserts into the sealing groove 312, thus limiting and cooperating with the sealing groove 312. Therefore, after the pressure on the pressing part 310 is released and the valve stem 200 is switched from the suction position to the closed position, the frictional resistance generated by the limiting fit between the sealing body 313 and the sealing groove 312 will restrict the separation of the sealing body 313 and the sealing groove 312. After the sealing body 313 and the sealing groove 312 are separated, the pressing part 310 of the valve cap 300 can return to its state before deformation under the action of elastic potential energy. Therefore, the fit between the sealing body 313 and the sealing groove 312 can delay the time required for the valve cap 300 to return to its state before deformation, thus prolonging the time required for the atmospheric passage 330 to change from the blocked state to the open state. By adjusting the frictional resistance between the sealing body 313 and the sealing groove 312, so that the time for the sealing body 313 and the sealing groove 312 to extend is greater than the time required for the valve stem 200 to switch from the suction position to the blocking position, the atmospheric channel 330 can always remain in a blocked state during the process of the valve stem 200 switching from the suction position to the blocking position, thus avoiding the atmospheric channel 330 and the sample channel 130 being connected during this process.

[0034] It should be noted that the magnitude of the frictional resistance between the sealing body 313 and the sealing groove 312 can be achieved by adjusting one or more of the roughness, shape, and material of the sealing body 313 and the sealing groove.

[0035] Preferably, the opening direction of the sealing groove 312 is perpendicular to the pressing direction, so that the insertion direction of the sealing body 313 into the sealing groove 312 is also perpendicular to the pressing direction. As a result, during the process of the sealing body 313 disengaging from the sealing groove 312, there is greater friction between the sealing body 313 and the sealing groove 312, thereby providing a better delay effect.

[0036] Furthermore, the distance between the sealing groove 312 and the end of the pressing part 310 is greater than the distance between the atmospheric channel 330 and the end of the pressing part 310, so that the atmospheric channel 330 is located between the ends of the sealing groove 312 and the pressing part 310. After the sealing body 313 is inserted into the sealing groove 312, the sealing body 313 and the sealing groove 312 can also play a sealing role, separating the atmospheric channel 330 and the valve cavity 110, thereby further preventing the atmospheric channel 330 and the sample channel 130 from connecting when the valve stem 200 switches between the suction position and the blocking position.

[0037] Furthermore, a first annular protrusion 314 is provided on the circumferential sidewall of the pressing part 310. The first annular protrusion 314 and the pressing end 210 of the valve stem 200 define a sealing groove 312. A second annular protrusion 315 is provided on the sealing body 313, and the second annular protrusion 315 can be inserted into the sealing groove 312. When the second annular protrusion 315 moves under the elastic action of the restoring deformation of the pressing part 310 and the sealing body 313, the second annular protrusion 315 will abut against the sidewall of the sealing groove 312, thereby prolonging the time for the pressing part 310 to return to its pre-deformation state to a certain extent, and also prolonging the time for the atmospheric passage 330 to reconnect with the buffer space 311 due to the restoring deformation of the pressing part 310. If necessary, the elastic modulus of the sealing body 313 can be set to be less than that of the pressing part 310, so that the speed at which the sealing body 313 recovers its deformation is less than that of the pressing part 310, thereby increasing the frictional force generated by the contact between the second annular protrusion 315 and the sealing groove 312.

[0038] In addition, it should be noted that by defining the sealing groove 312 by the first annular protrusion 314 and the sealing end 220 of the valve stem 200, one side of the groove wall of the sealing groove 312 is the end face of the sealing end 220 of the valve stem 200, so that the sealing body 313 will not be blocked or interfered with during the process of being inserted into the sealing groove 312.

[0039] Furthermore, at least one of the sides of the second annular protrusion 315 that mates with the first annular protrusion 314 or the side of the second annular protrusion 315 that mates with the first annular protrusion 314 is an arc surface, so that the second annular protrusion 315 can both abut against the side wall of the sealing groove 312 to generate friction, and at the same time, the existence of the arc surface will not cause the second annular protrusion 315 to get stuck with the side wall of the sealing groove 312 and be unable to separate from the sealing groove 312.

[0040] Furthermore, in this embodiment, the end of the pressing end 210 of the valve stem 200 is provided with a protruding guide portion 211. The protrusion height of the guide portion 211 gradually decreases from the center of the end of the pressing end 210 to the edge of the pressing end 210. In addition, a sealing groove 312 is provided at the edge of the guide portion 211. This makes the surface of the end of the guide portion 211 form a slope that is high in the middle and low around the edges. When the sealing body 313 abuts against the surface of the guide portion 211, it can deform and slide towards the sealing groove 312 under the action of the slope, thereby fitting into the sealing groove 312.

[0041] Of course, in some alternative embodiments, the sealing body 313 can also be configured as a cone shape, and the end of the sealing body 313 with a smaller diameter can be fixed to the end of the pressing part 310, so that the distance between the sealing body 313 and the axis of the sealing body 313 gradually increases from the end of the sealing body 313 connected to the pressing part 310 to the other end of the sealing body 313. With this configuration, after the end of the sealing body 313 away from the pressing part 310 abuts against the end of the pressing end 210 of the valve stem 200, this end of the sealing body 313 can deform and slide towards the edge of the pressing end 210, thereby fitting into the sealing groove 312.

[0042] In some alternative embodiments, a protruding guide portion 211 may be provided at the end of the pressing end 210 of the valve stem 200, and the sealing body 313 may be configured as a cone shape. This achieves a better fit and makes it easier for the sealing body 313 to slide towards the edge of the pressing end 210.

[0043] In this embodiment, the end face shape of the atmospheric channel 330 is as follows: Figure 1 As shown, the entire atmospheric channel 330 is an elliptical opening. Within this ellipse, there are perpendicular semi-axes and a major semi-axe, with the length of the minor semi-axe being shorter than the length of the major semi-axe. In this embodiment, the minor semi-axe of the elliptical atmospheric channel 330 is parallel to the pressing direction. This arrangement ensures that when the pressing part 310 of the valve cap 300 undergoes elastic deformation, the pressing force is applied to the minor semi-axe of the atmospheric channel 330. This allows the atmospheric channel 330 to be sealed more quickly and effectively.

[0044] There are several ways to achieve the connection between the aforementioned buffer space 311 and the atmospheric channel 330, one of which is as follows: Figure 1 and Figure 2As shown, the buffer space 311 and the atmospheric passage 330 are connected via a connecting channel 240. This connecting channel 240 is located on the valve stem 200, with one end connected to the buffer space 311 and the other end connected to the atmospheric passage 330, thus achieving communication between the two. Since the valve stem 200 is a rigid structure, the connecting channel 240 will not be blocked due to deformation of the valve stem 200. In this embodiment, the connecting channel 240 is a through hole located inside the valve stem 200 to prevent the valve cap 300 from blocking it during deformation. Alternatively, the connecting channel 240 can also be a groove located on the side wall of the valve stem 200.

[0045] Of course, in some alternative embodiments, the connecting channel 240 that connects the buffer space 311 and the atmospheric channel 330 can also be set on the valve cap 300, and the connection channel 240 can also be used to connect the buffer space 311 and the atmospheric channel 330.

[0046] Preferably, the aforementioned connecting channel 240 is disposed on the valve stem 200, with the first end 241 of the connecting channel 240 disposed on the pressing end 210 of the valve stem 200, and the second end 242 of the connecting channel 240 disposed on the stem body 230 of the valve stem 200. The first end 241 of the connecting channel 240 is disposed opposite to the end of the pressing part 310. With this configuration, after applying pressure to the pressing part 310, during the elastic deformation process, the end of the pressing part 310 will move closer to the first end 241 of the connecting channel 240, and eventually abut against and seal the first end 241 of the connecting channel 240. This prevents the atmospheric channel 330 from communicating with the valve cavity 110 after the valve stem 200 is switched to the suction position, and further prevents the atmospheric channel 330 from communicating with the sample channel 130.

[0047] Based on this, this embodiment also provides a pressing groove 317 at the end of the pressing part 310. The pressing groove 317 can be provided on the buffer space 311 on the inner wall of the pressing part 310, with the opening of the pressing groove 317 facing the first end 241 of the connecting channel 240 and being opposite to the first end 241 of the connecting channel 240. Alternatively, the pressing groove 317 can be provided on the outer wall of the pressing part 310, with the bottom of the pressing groove 317 facing the first end 241 of the connecting channel 240 and being opposite to the first end 241 of the connecting channel 240. After the pressing groove 317 is provided, the thickness of the bottom of the pressing groove 317 (i.e., the thickness of the end portion of the pressing part 310 where the pressing groove 317 is located) is less than the thickness of the end portion of the pressing part 310 around the pressing groove 317. Furthermore, after the end portion of the entire pressing part 310 is also made to be elastic, the thinner portion of the pressing part 310 is more likely to undergo elastic deformation and fit against the edge of the first end 241 of the connecting channel 240, thereby achieving a better seal on the first end 241 of the connecting channel 240.

[0048] In addition, preferred, such as Figure 2 As shown, the pressing groove 317 is provided on the outer wall of the end of the pressing part 310 so that the pressing groove 317 can play a positioning role for the operator's fingers. When the operator presses the valve cap 300, the fingers can feel the position of the pressing groove 317, and the pressing part 310 can be accurately pressed by pressing the pressing groove 317. This ensures that the pressing part 310 can block the first end 241 of the connecting channel 240. The entire pressing process does not require special observation of the finger position, so that when the operator operates the suction valve 10, the eyes can be focused on the endoscope display screen to more accurately control the timing and time of sample aspiration.

[0049] Furthermore, such as Figure 2As shown, in this embodiment, the valve cap 300 further includes a connecting portion 320, with its two ends connected to the valve body 100 and the pressing portion 310, respectively. The connecting portion 320 is also elastic, and its elastic modulus is greater than that of the pressing portion 310, so that when the pressing portion 310 of the valve cap 300 is pressed, the pressing portion 310 will elastically deform before the connecting portion 320. Thus, before the connecting portion 320 undergoes elastic deformation, the atmospheric passage 330 will be blocked due to the deformation of the pressing portion 310. Furthermore, during the recovery of elastic deformation, since the elastic modulus of the connecting portion 320 is greater than that of the pressing portion 310, the speed at which the connecting portion 320 recovers its elastic deformation is also faster than that of the pressing portion 310. The pressing end 210 of the valve stem 200 is fixed to the connecting part 320. Thus, after the connecting part 320 undergoes elastic deformation, it drives the valve stem 200 to switch from the closed position to the suction position. During the process of the connecting part 320 returning to its original shape, it drives the valve stem 200 to switch from the suction position to the closed position. This allows the valve stem 200 to automatically and quickly switch from the suction position to the closed position under the elastic action of the connecting part 320 after the pressing force applied to the pressing part 310 is released.

[0050] Of course, it should be noted that when the valve stem 200 is not connected to the valve cap 300, the valve stem 200 can be manually pulled to switch from the suction position to the closed position. If necessary, a locking device can be used to lock the valve stem 200 in the closed position. Alternatively, a separate elastic element, such as a spring or sheet, can be provided on the valve body 100, with both ends connected to the valve body 100 and the valve stem 200. This allows the elastic element to undergo elastic deformation and store elastic potential energy during the switching process from the closed to the suction position. During the switching process, the elastic element releases this potential energy to automatically switch the valve stem 200 to the closed position. Furthermore, when setting the elastic element, its elastic modulus can be set to be greater than that of the pressing part 310 of the valve cap 300, so that when a pressing force is applied to the pressing part 310, the pressing part 310 undergoes elastic deformation before the elastic element.

[0051] It should be noted that in this embodiment, the connecting part 320 and the pressing part 310 of the valve cap 300 are integrally formed so that the connecting part 320 and the pressing part 310 are relatively sealed and have higher connection stability.

[0052] In addition, in this embodiment, the connecting end of the valve stem 200 and the connecting part 320 are sealed together, so that the gas exchange between the atmospheric passage 330 and the valve cavity 110 can only be achieved through the connecting passage 240. This allows the pressing end 210 to completely disconnect the connection between the atmospheric passage 330 and the valve cavity 110 after it is blocked at the first end 241 of the connecting passage 240.

[0053] In this embodiment, since the connecting part 320 is elastic, the connection between the connecting end of the valve stem 200 and the connecting part 320 can be achieved by snap-fitting. If necessary, adhesive bonding can also be used to enhance the connection stability and sealing of the valve stem 200 and the connecting part 320.

[0054] Based on the aforementioned suction valve 10, this application embodiment also provides an endoscope, which includes an endoscope handle and the aforementioned suction valve 10. The suction valve 10 is fixed to the endoscope handle so that the sample channel 130 of the suction valve 10 is connected to the insertion tube connected to the endoscope handle, so as to cooperate with the endoscope to complete the collection of pathological samples in the human body. The endoscope in this application embodiment can be a bronchoscope, pyeloscope, esophagoscope, gastroscope, colonoscope, otoscope, rhinoscope, oral endoscope, laryngoscope, colposcope, laparoscope, arthroscope, etc., which can be used in conjunction with the suction valve 10. This application embodiment does not specifically limit the type of endoscope.

[0055] 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, characterized in that, include: The valve body (100) has a valve cavity (110) inside, and a negative pressure channel (120) and a sample channel (130) communicating with the valve cavity (110) are provided on the valve body (100). A valve cap (300) is fixed to the valve body (100). The valve cap (300) has a pressing part (310). The circumferential sidewall of the pressing part (310) is elastic. An atmospheric passage (330) is provided on the circumferential sidewall of the pressing part (310). A valve stem (200) has a pressing end (210) and a blocking end (220) opposite to each other. The blocking end (220) of the valve stem (200) is movably disposed in the valve cavity (110) so that the blocking end (220) of the valve stem (200) can switch between a closed position and a suction position. A buffer space (311) is defined between the pressing end (210) of the valve stem (200) and the valve cap (300). The buffer space (311) is connected to the atmospheric passage (330). The buffer space (311) is located in the pressing direction of the suction valve (10) so that during the pressing of the end of the pressing part (310), the pressing part (310) deforms to compress the buffer space (311) and block the atmospheric passage (330), and the pressing part (310) is configured to press against the pressing end (210) of the valve stem (200) after blocking the atmospheric passage (330). The pressing part (310) has an annular sealing groove (312) on its circumferential sidewall, and the opening of the sealing groove (312) is connected to the buffer space (311). The pressing part (310) is provided with an annular sealing body (313), which is located in the buffer space (311). The sealing body (313) is spaced apart from the sealing groove (312). During the pressing of the pressing part (310), the sealing body (313) abuts against the pressing end (210) and is inserted and limited in the sealing groove (312).

2. The suction valve according to claim 1, characterized in that, The pressing part (310) has a first annular protrusion (314) on its circumferential sidewall. The first annular protrusion (314) and the sealing end (220) define the sealing groove (312). The sealing body (313) has a second annular protrusion (315) that can be inserted into the sealing groove (312). At least one of the sides of the second annular protrusion (315) that mates with the first annular protrusion (314) or the sides of the second annular protrusion (315) that mates with the first annular protrusion (314) is an arc surface (316).

3. The suction valve according to claim 1, characterized in that, The valve stem (200) has a protruding guide portion (211) at the end of the pressing end (210), and the protrusion height of the guide portion (211) gradually decreases from the center of the end of the pressing end (210) to the edge of the pressing end (210). And / or, the sealing body (313) is inclined relative to the pressing direction of the valve cap (300), and the distance between the sealing body (313) and the axis of the sealing body (313) gradually increases from one end of the sealing body (313) connected to the pressing part (310) to the other end of the sealing body (313).

4. The suction valve according to claim 1, characterized in that, The atmospheric channel (330) is an elliptical hole, and the short semi-axis of the atmospheric channel (330) is parallel to the pressing direction.

5. A suction valve according to claim 1, characterized in that, The buffer space (311) is connected to the atmospheric passage (330) through a connecting channel (240), which is located on the valve stem (200) or on the valve cap (300).

6. A suction valve according to claim 5, characterized in that, The connecting channel (240) is disposed on the valve stem (200). The first end (241) of the connecting channel (240) is disposed on the pressing end (210) of the valve stem (200), and the second end (242) of the connecting channel (240) is disposed on the stem body (230) of the valve stem (200). The first end (241) of the connecting channel (240) is disposed opposite to the end of the pressing part (310).

7. A suction valve according to claim 6, characterized in that, The end of the pressing part (310) is provided with a pressing groove (317), and the opening or bottom of the pressing groove (317) is disposed opposite to the first end (241) of the connecting channel (240).

8. A suction valve according to claim 1, characterized in that, The valve cap (300) also includes a connecting part (320), the two ends of which are connected to the valve body (100) and the pressing part (310) respectively. The elastic modulus of the connecting part (320) is greater than that of the pressing part (310), and the pressing end (210) of the valve stem (200) is fixed on the connecting part (320).

9. An endoscope, characterized in that, It includes an endoscope handle and a suction valve (10) as described in any one of claims 1-8, the suction valve (10) being fixed to the endoscope handle.

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