Suction valve, suction assembly and endoscope

Abstract

The invention provides a suction valve, a suction assembly and an endoscope, relates to the technical field of endoscopes, and solves the problem of hidden danger of sealing stability of a sealing ring in the prior art. A valve rod of the suction valve can be controlled to be repeatedly switched in the axial direction relative to a valve cavity so as to switch the suction state; an abutting surface is arranged at the bottom end of the valve cavity in the axial direction; a sealing ring which axially supports the deformation groove and is in radial sealing contact with the inner circumferential wall of the valve cavity is mounted in the deformation groove which is formed in the outer circumferential wall of the valve rod and can be axially compressed; the valve rod can axially compress the deformation groove to axially extrude the sealing ring in the deformation groove when being axially extruded, so that the sealing ring is radially outwards elastically deformed to be in pressurized contact with the inner circumferential wall of the valve cavity; at the first position, the bottom end of the valve rod is separated from the abutting surface, axially extends and is in a pause state; in the second position, the bottom end of the valve rod axially extrudes the abutting face and axially compresses the deformation groove, and the valve rod is in an attraction state. The contradiction between easy installation and sealing stability of the sealing ring can be adjusted to a certain degree, and the hidden danger of sealing stability of the sealing ring is eliminated.

Description

Technical Field

[0001] This invention relates to the field of endoscopy technology, specifically to a suction valve, a suction assembly, and an endoscope. Background Technology

[0002] Endoscopes are generally used to insert their inserts into body cavities through natural or artificial openings for observation, treatment, or sampling. Some endoscopes are equipped with suction valves to controllably remove body fluids, stones, tissues, etc. from body cavities. For example, a suction endoscope uses a suction valve to controllably suction sputum from the trachea and bronchi at appropriate times.

[0003] Currently, some suction valves utilize a high-precision shaft hole fit between the valve stem and valve body to achieve sealing, facilitating smooth valve state switching. These valves require high manufacturing and assembly precision for their stems and bodies, resulting in high costs and are primarily used in reusable endoscopes. To reduce costs and make them more suitable for disposable endoscopes, some suction valves have reduced the manufacturing precision of the valve stem and valve body, decreasing the valve stem diameter and adding multiple sealing rings. Sealing is achieved through these sealing rings and the valve body. For example, in the JP2025523259A endoscope suction endoscope, the manufacturing precision requirements for the valve stem and valve body are reduced, and sealing is achieved through three sealing rings arranged sequentially along the axial direction on the valve stem. While this significantly reduces manufacturing costs to some extent, it creates an irreconcilable conflict between the ease of installation of the sealing rings and the stability of the seal, potentially compromising the sealing stability of the suction valve. Summary of the Invention

[0004] The purpose of this invention is to design a suction valve, a suction assembly, and an endoscope to solve the problem of potential sealing instability of the sealing ring.

[0005] This invention is achieved through the following technical solution: On one hand, the present invention provides a suction valve, including a valve body, a valve stem installed in its valve cavity, and a sealing ring. The valve stem can be controllably switched between a first position and a second position in the axial direction relative to the valve cavity to switch suction states. An abutment surface is provided at the bottom end of the valve cavity in the axial direction. An axially compressible deformation groove provided on the outer peripheral wall of the valve stem contains a sealing ring that axially supports the deformation groove and radially seals against the inner peripheral wall of the valve cavity. When the valve stem is subjected to axial compression, it can axially compress the deformation groove to axially compress the sealing ring therein, causing it to elastically deform radially outward and pressurize against the inner peripheral wall of the valve cavity. In the first position, the bottom end of the valve stem is disengaged from the abutment surface and is in a paused state. In the second position, the bottom end of the valve stem axially compresses the abutment surface and axially compresses the deformation groove, and is in a suction state.

[0006] When the above-described structure is adopted, the valve stem is configured as a member that can be axially compressed by axial force to create a deformation groove on its outer peripheral wall. This allows the sealing ring located within the deformation groove to deform radially outward under the axial pressure of the groove, thereby enhancing the sealing effect of the sealing ring on the valve cavity within the valve body. During the engagement of the valve stem with the valve cavity having a contact surface at its bottom, when the valve stem is controlled to move from a first position to a second position relative to the valve cavity, the suction state switches from a paused state to an attraction state. At this time, the bottom end of the valve stem abuts against the contact surface and is subjected to axial force, allowing the valve stem to axially compress the deformation groove to enhance the sealing effect on the valve cavity through the radial deformation of the sealing ring. Therefore, this type of suction valve has the characteristic of compensating for the sealing performance of the sealing ring, enabling it to reconcile the contradiction between the ease of installation of the sealing ring and the sealing stability to a certain extent. While ensuring stable sealing performance, the assembly precision requirements between the sealing ring, valve stem, and valve cavity can be further appropriately reduced.

[0007] In a second aspect, the present invention provides a suction assembly, the suction assembly including a suction nozzle, a suction tube and a suction valve, one end of the suction nozzle being connected to a discharge port provided inside the suction valve, and one end of the suction tube being connected to a suction port provided inside the suction valve.

[0008] Thirdly, the present invention provides an endoscope comprising a handle housing and a suction assembly mounted on the handle housing.

[0009] The present invention has the following advantages and beneficial effects: In this invention, the valve stem of the suction valve used in an endoscope is configured to be axially compressed by a deformation groove on its outer peripheral wall under axial force. This allows the sealing ring located within the deformation groove to deform radially outward under the axial pressure of the groove, thereby enhancing the sealing effect of the sealing ring on the valve cavity within the valve housing. During the engagement of the valve stem with the valve cavity having a contact surface at its bottom, when the valve stem is controlled to move from a first position to a second position relative to the valve cavity, the suction state switches from a paused state to a suction state. At this time, the bottom end of the valve stem abuts against the contact surface and is subjected to axial force, allowing the valve stem to axially compress the deformation groove to enhance the sealing effect on the valve cavity through the radial deformation of the sealing ring. Therefore, this suction valve has the characteristic of compensating for the sealing performance of the sealing ring, allowing it to reconcile the contradiction between the ease of installation of the sealing ring and the sealing stability to a certain extent. While ensuring stable sealing performance, the assembly precision requirements between the sealing ring, valve stem, and valve cavity can be further appropriately reduced. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the appearance of the endoscope of the present invention; Figure 2 The structure of the suction assembly installed inside the endoscope handle is shown; Figure 3 This is a partial cross-sectional view of the suction component, with the suction valve in the paused state. Figure 4 This is a schematic diagram of the suction valve, which is in the suction state. Figure 5 yes Figure 4 A cross-sectional view of the suction valve shown. Figure 6 This is a schematic diagram of the valve stem structure; Figure 7 The structure shown is in Figure 6 Based on this, a sealing ring in the deformation groove located on the top side of the collar and a sealing ring in the mounting groove were removed; Figure 8 The structure shown is in Figure 6 The sleeve was removed from the original design. Figure 9 The structure shown is in Figure 8 The sealing ring was removed from the original design. Figure 10 This is a schematic diagram of the sealing ring structure; Figure 11 The structure shown is in Figure 4 The sleeve with the cap was removed from the basic design; Figure 12 The structure shown is in Figure 11 The casing and return spring were removed from the basic design. Figure 13 This is a schematic diagram of the shell structure.

[0012] The diagram is marked as follows: 100. Suction valve; 10. Valve housing; 101. Core housing; 102. Outer housing; 11. Valve cavity; 12. Abutment surface; 13. Suction port; 14. Discharge port; 15. Atmospheric port; 151. Turning section; 16. Annular groove; 17. Flange; 20. Valve stem; 201. Deformation groove; 202. Mounting groove; 21. Center rod; 211. Collar; 212. Slot; 213. Insertion hole; 214. Adapter channel; 22. Sleeve; 23. Cap; 231. Guide wall; 232. Column; 25. Return spring; 30. Sealing ring; 31. Skirt; 200, Suction nozzle; 300, Suction tube; 400, T-joint; 500, Traction wheel; 600, Insertion part; 800, Suction assembly; 900, Handle housing; 1000. Endoscope; a. Installation gap; b. First gap; c. Second gap. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0014] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0015] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0016] In the description of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0017] In the various embodiments of this application, "near end" and "far end" refer to the distance of each component from the user in the usage environment. The end closer to the user is designated as the "near end", and the end farther from the user is designated as the "far end".

[0018] This application relates to the field of endoscopic technology, specifically to a suction valve. The distal end of the suction valve is connected to the suction tube for communication with the instrument tube, and the proximal end is connected to the suction nozzle for communication with various negative pressure sources, including a negative pressure pump. The suction valve switches between suction and pause states by manually controlling the position of the valve stem. In the pause state, the valve stem closes the proximal end of the suction tube, and the suction valve connects the negative pressure source, suction nozzle, and vent to the atmosphere. This prevents the negative pressure generated by the negative pressure source from acting on the suction tube, thus preventing the negative pressure from acting on the instrument tube and eliminating the suction effect on tissues, fluids, stones, etc., distal to the instrument tube. In the suction state, the valve stem opens the proximal end of the suction tube and closes the vent to the atmosphere. The suction valve connects the negative pressure source, suction nozzle, and suction tube, allowing the negative pressure generated by the negative pressure source to act on the instrument tube. This allows tissues, fluids, stones, etc., distal to the instrument tube to be drawn into the instrument tube and sequentially discharged through the instrument tube, suction tube, suction valve, and suction nozzle into a collection container located proximal to the instrument tube.

[0019] The valve stem of the suction valve involved in this application can use axial compressive force to cause the sealing ring installed on it to be axially compressed and deformed and extended radially outward, thereby compensating for the sealing pressure of the sealing ring in the valve cavity of the suction valve to a certain extent and ensuring the stability of the seal.

[0020] The following is in conjunction with the appendix Figures 1 to 13 This application will be described in detail through specific embodiments and application scenarios.

[0021] On the one hand, this application provides a suction valve 100 for an endoscope 1000, such as Figure 2 - Figure 5 As shown, it is specifically configured with the following structure: like Figure 5As shown, the suction valve 100 includes a valve housing 10, a valve stem 20, and a sealing ring 30. The valve housing 10 contains a valve chamber 11, and also includes a suction port 13, a discharge port 14, and an vent 15 communicating with the valve chamber 11. When the suction valve 100 is installed on an endoscope 1000, the suction port 13 of the valve housing 10 is connected to the proximal port of the suction tube 300, the discharge port 14 is connected to the distal port of the suction nozzle 200, and the vent 15 communicates with the external environment. Figure 5 In the valve housing 10, the intake port 13, the exhaust port 14, and the vent 15 are respectively connected to the valve chamber 11 at three different locations. The vent 15, intake port 13, and exhaust port 14 are arranged sequentially from top to bottom along the axial direction of the valve chamber 11. Of course, the specific location and orientation of each channel in the valve housing 10 are not limited to... Figure 5 The form shown can also be other forms already existing in the prior art.

[0022] Of course, in some feasible embodiments, the atmospheric port can also be removed from the valve housing 10 and an atmospheric port communicating with the transition channel 214 can be formed on the valve stem 20. This type of valve stem 20 is quite common in the prior art.

[0023] like Figure 5 As shown, the valve stem 20 is provided with a transition channel 214 for always communicating with the discharge port 14 in the valve housing 10 and for selectively communicating with the atmospheric port 15 and the suction port 13 in the valve housing 10.

[0024] The valve stem 20 is installed in the valve cavity 11 of the valve housing 10. At the same time, a certain number of sealing rings 30 located in the valve cavity 11 are fitted on the valve stem 20, so that after the valve stem 20 and the valve cavity 11 are engaged, the suction valve 100 can switch the suction state by manually adjusting the position of the valve stem 20 relative to the valve cavity 11.

[0025] The valve stem 20 can be controlled to repeatedly switch between a first position and a second position in the axial direction relative to the valve chamber 11 to switch the suction state. Figure 3 In the structure of the suction valve 100 shown, the valve stem 20 is in the first position relative to the valve cavity 11, and the suction valve 100 is in a paused state. At this time, one end of the transition flow channel 214 provided in the valve stem 20 is connected to the atmospheric port 15 provided in the valve housing 10, and the other end is connected to the discharge port 14 provided in the valve housing 10. The suction port 13 provided in the valve housing 10 is blocked by the outer peripheral wall of the valve stem 20 and the port is sealed by the sealing ring 30. Figure 5In the structure of the suction valve 100 shown, the valve stem 20 is in the second position relative to the valve cavity 11, and the suction valve 100 is in the suction state. At this time, one end of the transfer flow channel 214 provided in the valve stem 20 is connected to the suction port 13 provided in the valve housing 10, and the other end is connected to the discharge port 14 provided in the valve housing 10. The suction port 13 is sealed by the sealing ring 30 at the same time, and the vent 15 is blocked by the outer peripheral wall of the valve stem 20 so that the vent 15 is disconnected from the transfer flow channel 214.

[0026] In some feasible embodiments, the atmospheric port 15 can also be removed from the valve housing 10 and instead formed on the valve stem 20 to create an atmospheric vent that communicates with the transition channel 214. During the axial movement of the valve stem 20 relative to the valve housing 10, when the valve stem 20 is in its initial position, similar to the first position in some embodiments where the atmospheric port 15 is formed on the valve housing 10, the atmospheric vent on the valve stem 20 extends out of the valve housing 10 or is not blocked by the valve housing 10. The transition channel 214 can establish communication with the external environment through the atmospheric vent, and the suction state of the suction valve 100 is in a suspended state. When the valve stem 20 is pressed down to a certain position, the atmospheric vent on the valve stem 20 will penetrate into the valve housing 10 and be blocked and closed by a structure on the valve housing 10, such as the peripheral wall of the valve cavity 11 or other structures, so that the transition channel 214 can no longer communicate with the external environment through the atmospheric vent. At this time, the transition channel 214 will communicate with the suction port 13, and the suction state of the suction valve 100 will be in a suction state.

[0027] In this embodiment, as Figure 3 As shown, the valve housing 10 has a step at the bottom of its valve cavity 11 in the axial direction, and one end of the step forms an abutment surface 12. This abutment surface 12 is located in the direction of movement of the valve stem 20. The valve stem 20 moves to the position shown in the figure. Figure 5 In the second position shown, it can axially abut against the contact surface 12 to cause it to deform when subjected to axial compressive force.

[0028] like Figure 7 As shown, a deformation groove 201 is provided on the outer peripheral wall of the valve stem 20. This deformation groove 201 can be axially compressed and deformed to reduce its width when subjected to axial compressive force. A sealing ring 30 is installed inside the deformation groove 201 and sleeved on the valve stem 20. The sealing ring 30 provides axial support to the deformation groove 201 to maintain its width, and its outer peripheral surface radially seals against the inner peripheral wall of the valve cavity 11.

[0029] While the two ends of the sealing ring 30 axially support the deformation groove 201, they can also make sealing contact with the corresponding side wall of the deformation groove 201.

[0030] When the valve stem 20 is subjected to axial compression, it can axially compress the deformation groove 201, allowing the axially compressed deformation groove 201 to axially compress the sealing ring 30 within it. This causes the sealing ring 30 to elastically deform radially outward, further pressurizing the inner circumferential wall of the valve cavity 11, increasing both the tightness and the contact area. The valve stem 20 is positioned relative to the valve cavity 11 as follows: Figure 3 In the first position, the bottom end of the valve stem 20 disengages from the abutment surface 12 and extends axially, pausing the suction state of the suction valve 100. The valve stem 20 is positioned relative to the valve chamber 11 as follows: Figure 5 When in the second position, the bottom end of the valve stem 20 contacts the abutment surface 12 and axially presses the abutment surface 12, thereby axially compressing the deformation groove 201. At this time, the suction state of the suction valve 100 is in the suction state.

[0031] The valve stem 20 in the suction valve 100 can be a push-type rod that moves axially or a rotary rod that moves axially.

[0032] In this embodiment, the valve stem 20 of the suction valve 100 is configured to be axially compressed by a deformation groove 201 provided on its outer peripheral wall under axial force. This allows the sealing ring 30 provided in the deformation groove 201 to deform radially outward under the axial pressure of the deformation groove 201, thereby enhancing the sealing effect of the sealing ring 30 on the valve cavity 11 provided in the valve housing 10. During the engagement of the valve stem 20 with the valve cavity 11, which has an abutment surface 12 at its bottom end, when the valve stem 20 is controlled to move from a first position to a second position relative to the valve cavity 11, the suction state switches from a paused state to a suction state. At this time, the bottom end of the valve stem 20 abuts against the abutment surface 12 and is subjected to axial force, allowing the valve stem 20 to axially compress the deformation groove 201 to enhance the sealing effect on the valve cavity 11 through the radial deformation of the sealing ring 30. Therefore, this type of suction valve has the characteristic of compensating for the sealing performance of the sealing ring 30, allowing the suction valve 100 to reconcile the contradiction between the ease of installation of the sealing ring and the sealing stability to a certain extent. While ensuring stable sealing performance, the assembly precision requirements between the sealing ring 30, valve stem 20, and valve cavity 11 can be further appropriately reduced. For example, the required tightness of the assembly between the sealing ring 30 and valve stem 20 can be appropriately reduced, allowing the inner diameter of the sealing ring 30 to be made larger for easier installation onto the valve stem 20 during production. Alternatively, the required tightness of the fit between the sealing ring 30 and valve cavity 11 can be appropriately reduced, allowing for a reduction in the outer diameter of the sealing ring 30 to decrease the pressure on the valve cavity 11, making the axial movement of the assembly of the valve stem 20 and sealing ring 30 easier and smoother. Furthermore, the fit clearance between the valve stem 20 and valve cavity 11 can be increased, or the machining precision can be further reduced.

[0033] According to some optional embodiments, the inner circumferential surface of the sealing ring 30 disposed at the deformation groove 201 seals against the peripheral wall of the center rod 21.

[0034] According to some optional embodiments, the valve stem 20 is configured as a rod that cannot be axially compressed as a whole. Simultaneously, this type of valve stem 20 is also an assembled rod composed of two types of parts. When axially compressed, one type of part can abut against the abutment surface 12 at the bottom of the valve cavity 11 and move relative to the other type of part. The other type of part can then pass over the abutment surface 12, thus compressing the sealing ring 30 through the two types of parts without reducing the axial dimension of the valve stem 20. For example, the valve stem 20 includes a central rod and a movable ring movably sleeved on the central rod. A collar is provided in the middle section of the central rod, and the end face of the collar serves as a portion for restricting the sealing ring. Simultaneously, the central rod is provided with multiple axially extending grooves arranged sequentially in the circumferential direction. One end of the movable ring is provided with multiple axially extending fingers arranged sequentially in the axial direction, and the fingers of the movable ring slide in a corresponding manner with the grooves. A deformation groove is formed between the end of the movable ring and the collar. When the valve stem 20 is in such a state... Figure 3 In the first position shown, the bottom end of the finger-shaped part of the moving ring is flush with the bottom end of the center rod, and the valve stem 20 is in the position shown. Figure 5 In the second position shown, the fingers of the movable ring abut against the multiple axial protrusions provided on the abutment surface of the valve housing 10, and the axial protrusions extend into the slide groove one by one and abut against the bottom end of the fingers one by one, so that the movable ring moves axially relative to the central rod, thereby allowing the end of the movable ring to axially press and position the sealing ring installed on the central rod.

[0035] According to some alternative embodiments, the valve stem 20 is configured as a rod that can be axially compressed, such that when the valve stem 20 is in the second position relative to the valve cavity 11 of the valve housing 10, the valve stem 20 can be axially compressed, resulting in axial compression of the deformation groove 201. Exemplarily, the valve stem 20 is a one-piece molded rubber rod. Exemplarily, the valve stem 20 is an assembled rod composed of two types of parts. When axially compressed, one type of part can abut against the abutment surface 12 at the bottom of the valve cavity 11 and move relative to the other type of part to reduce the axial dimension of the valve stem 20, thereby achieving axial compression.

[0036] In some alternative embodiments, the valve stem 20 is configured as a rod that can be axially compressed, and the valve stem 20 is an assembled rod composed of two types of parts, such as... Figure 5 - Figure 9 As shown, the valve stem 20 includes a central stem 21 and a sleeve 22 fitted thereon. The sleeve 22 can reciprocate along the axial direction of the central stem 21 to adjust the width of the deformation groove 201. Figure 9 and Figure 8 As shown, a collar 211 is provided in the middle section of the central rod 21, and at least one end face of the collar 211 is used as a part for restricting the sealing ring 30.

[0037] Depending on the requirements, one or two sleeves 22 can be provided, so that a sleeve 22 that can be axially moved and sleeved on one or both ends of the collar 211 is provided on the central rod 21. Figure 5 - Figure 8 Specifically, the case where two sleeves 22 are provided on the central rod 21 is shown. The end of the sleeve 22 facing the collar 211 forms a deformation groove 201 between it and the collar 211, so that two deformation grooves 201 are formed on the valve stem 20. By driving the sleeve 22, it can be moved relative to the central rod 21. Since the sealing ring 30 provided in the deformation groove 201 provides axial support for the deformation groove 201, the sleeve 22 will axially press the sealing ring 30 between them with the corresponding end face of the collar 211, causing it to elastically deform radially outward.

[0038] To further prevent the sealing ring 30 from twisting due to contact with the inner wall of the valve cavity 11 when the valve stem 20 moves axially relative to the valve cavity 11, or from being directly pulled out of the deformation groove 201 by the large frictional force between the sealing ring 30 and the valve cavity 11, such as Figure 9 and Figure 10 As shown, a circumferentially extending annular groove 212 is provided on the end face of the collar 211, and an axially extending annular skirt 31 is provided on one end of the sealing ring 30, so that the cross-sectional shape of the sealing ring 30 is approximately L-shaped. After the sealing ring 30 is installed into the deformation groove 201, refer to... Figures 9 to 8 Changes and combinations Figure 5 As can be easily seen from the structure shown, the skirt 31 is inserted into the groove 212 along the axial direction, which can effectively maintain the shape of the sealing ring 30 and help prevent it from falling out of the deformation groove 201.

[0039] According to some alternative embodiments, the valve stem 20 is configured as a rod that can be axially compressed, and the valve stem 20 is an assembled rod composed of two types of parts, with the end of the sleeve 22 facing away from the collar 211 extending beyond the end of the central rod 21.

[0040] In some embodiments where two sleeves 22 are provided on the central rod 21, or in some embodiments where only one sleeve 22 is provided on the central rod 21 located at the top end of the collar 211, the top end of the sleeve 22 located on the central rod 21 at the top end of the collar 211 extends beyond the top end of the central rod 21. This allows for easier connection to a component for receiving a human finger or easier pressing by a human finger to controllably move axially relative to the valve cavity 11. To facilitate pressing the top end of the sleeve 22 by hand, the portion of the top end of the sleeve 22 outside the valve cavity 11 is provided with a cap 23 for pressing by hand. The diameter of the pressing surface of the cap 23 is larger than the diameter of the valve rod 20.

[0041] In some embodiments where sleeves 22 are provided on both ends of the central rod 21 at the collar 211, such as... Figure 3As shown, the bottom end of the sleeve 22 near the abutment surface 12 extends beyond the bottom end of the center rod 21, and the top end of the sleeve 22 away from the abutment surface 12 extends beyond the top end of the center rod 21.

[0042] according to Figure 3 and Figure 5 It can be seen that when the sleeve 22 located near the top of the valve stem 20 is pressed down by a person's finger, the sleeve 22 causes the deformation groove 201 formed by the sleeve 22 to be axially compressed and drives the central rod 21 to move downward. The sleeve 22 located near the bottom of the valve stem 20... Figure 5 In the illustrated scenario, the sleeve 22, which abuts against the contact surface 12 at the bottom of the valve cavity 11, stops moving downwards. This causes the sleeve 22 to move upwards relative to the central rod 21, thereby axially compressing the deformation groove 201 formed by the sleeve 22. Simultaneously, the deformation groove 201 formed by the sleeve 22 near the top also undergoes axial compression. This causes the sealing ring 30 located in these two deformation grooves 201 to be axially compressed and radially deformed outwards, creating a stronger compressive force on the inner wall of the valve cavity 11.

[0043] According to some alternative embodiments, the sleeve 22 is fitted onto the center rod 21 for frictional braking via a shaft-hole engagement, such that the sleeve 22 can move the center rod 21 in some cases, such as during at least a portion of the time when the valve stem 20 returns from the second position to the first position.

[0044] In some embodiments, the valve stem 20 can be reset by providing a return spring 25. For example... Figure 3 , Figure 5 and Figure 11 As shown, the return spring 25 is sleeved on the valve stem 20, and the two ends of the return spring 25 are respectively connected to the valve body 10 and the valve stem 20. Specifically, it can be... Figure 5 The cap 23 is provided at the top of the center rod 21 shown in the figure.

[0045] In other embodiments, the return spring 25 may also be disposed on the abutment surface 12 at the bottom of the valve cavity 11, and the valve stem 20 is reset by pushing the end of the center rod 21 with its top end.

[0046] According to some optional embodiments, the sleeve 22 and the sealing ring 30 are integrally formed, specifically by integral injection molding, melt connection, welding, or adhesive bonding. After the corresponding ends of the sealing ring 30 and the sleeve 22 are integrally formed, the sealing ring 30 and the sleeve 22 can be installed onto the center rod 21 in one step. In addition, the suction valve 100 allows for a slightly reduced requirement for tightness in the fit between the sealing ring 30 and the valve stem 20, making the installation process of the sealing ring 30 and the sleeve 22 easy and quick.

[0047] According to some optional embodiments, such as Figure 3 and Figure 5 As shown, a cap 23 is provided at the top of the sleeve 22 located on the top side of the collar 211 on the central rod 21. A guide wall 231 extending toward the bottom of the valve stem 20 is provided around the cap 23. The guide wall 231 is inserted into the atmospheric port 15 provided inside the valve body 10 and forms a gap between it and the atmospheric port 15 to allow air to flow.

[0048] In some embodiments, the guide wall 231 is configured as a cylindrical member extending along the periphery of the cap 23, while one end of the vent 15 is configured as an annular groove surrounding the valve stem 20 to accommodate the cylindrical guide wall 231.

[0049] Some alternative embodiments, such as Figure 3 and Figure 5 As shown, the middle section of the atmospheric port 15 has an L-shaped bend 151. When the valve stem 20 is in the first position relative to the valve cavity 11, the bottom end of the guide wall 231 of the cap 23 provided at the top of the sleeve 22 moves away from the bend 151. When the valve stem 20 is in the second position relative to the valve cavity 11, the bottom end of the guide wall 231 of the cap 23 provided at the top of the sleeve 22 abuts against the inner wall of the bend 151, closing the atmospheric port 15 at the bend 151.

[0050] In some embodiments, the top center of the central rod 21 is provided with an insertion hole 213, and the center of the cap 23 provided at the top of the sleeve 22 is provided with a post 232 that extends axially toward the bottom end of the valve stem 20 into the insertion hole 213, and the post 232 is tightly fitted with the insertion hole 213.

[0051] In some embodiments, a first gap b exists between the bottom end of the post 232 and the bottom of the socket 213, while a second gap c exists between the top end of the center rod 21 and the bottom of the cap 23. When the valve stem 20 is in a first position relative to the valve cavity 11, the first gap b and the second gap c exist. When the valve stem 20 is in a second position relative to the valve cavity 11, the bottom end of the post 232 abuts against the bottom of the socket 213 to eliminate the first gap b, and the top end of the center rod 21 abuts against the bottom of the cap 23 to eliminate the second gap c. During the process of the valve stem 20 moving from the second position to the first position relative to the valve cavity 11, the first gap b and the second gap c reappear because the sealing ring 30 disposed in the deformation groove 201 formed by the sleeve 22 located on the top side of the collar 211 pushes the sleeve 22 upward when it returns. The above arrangement allows the sealing ring 30 to have a greater degree of axial deformation when the sleeve 22 located on the top side of the collar 211 is pressed, thereby obtaining a greater degree of radial outward deformation.

[0052] According to some optional embodiments, such as Figure 3 , Figure 5 and Figure 6As shown, three sealing rings 30 are provided. To install the three sealing rings 30, the valve stem 20 includes two deformation grooves 201 arranged sequentially along the axial direction, as well as an installation groove 202. The installation groove 202 is located on the outer peripheral wall of the sleeve 22 near the abutment surface 12, that is, on the bottom end side of the sleeve 22 of the collar 211. The sealing rings 30 that make radial sealing contact with the inner peripheral wall of the valve cavity 11 are installed in the installation groove 202. The sealing rings 30 installed in the installation groove 202 and the sealing rings 30 installed in the two deformation grooves 201 are arranged sequentially along the axial direction of the valve stem 20, and the sealing rings 30 installed in the installation groove 202 are closest to the abutment surface 12.

[0053] like Figure 2 and Figure 3 As shown, in the first position, the top of the valve stem 20 protrudes from the top of the valve housing 10. The inlet of the transition channel 214 provided inside the valve stem 20 connects to the vent 15 of the valve housing 10, and the outlet of the transition channel 214 connects to the discharge port 14 of the valve housing 10. The sealing ring 30 in the mounting groove 202 and the sealing ring 30 in an adjacent deformation groove 201 seal the periphery of the suction port 13 of the valve housing 10, and the sealing rings 30 in the two deformation grooves 201 seal the periphery of the vent 15. In the second position, as... Figure 4 and Figure 5 As shown, the top of the valve stem 20 moves downward to a position roughly the same as the top of the valve body 10. The inlet of the transition channel 214 provided inside the valve stem 20 is connected to the suction port 13, and the outlet of the transition channel 214 is connected to the discharge port 14. The sealing rings 30 in the two deformation grooves 201 seal the periphery of the suction port 13.

[0054] On the one hand, this application also provides an attraction component 800, such as Figure 2 and Figure 3 As shown, the suction assembly 800 includes a suction nozzle 200, a suction tube 300, and a suction valve 100 as described in any of the above embodiments. The distal end of the suction nozzle 200 is connected to the discharge port 14 provided within the suction valve 100, and the proximal end is used to connect to a negative pressure source. The proximal end of the suction tube 300 is connected to the suction port 13 provided within the suction valve 100, and the distal end is used to connect to a three-way tube 400 with an instrument nozzle.

[0055] On the one hand, this application also provides an endoscope 1000, such as Figure 1 and Figure 2 As shown, the endoscope 1000 includes a handle housing 900, a suction assembly 800 mounted on the handle housing 900, a traction wheel 500, and an insertion portion 600. The proximal end of an instrument tube (not shown) within the insertion portion 600 is connected to the distal end of a three-way connector 400, and the proximal end of the three-way connector 400 is connected to the distal end of the suction tube 300. Figure 3As shown, the traction wheel 500 is located at the distal end of the attraction assembly 800 and is used to connect the traction rope to control the bending of the insertion part 600.

[0056] According to some optional embodiments, such as Figure 2 - Figure 5 As shown, the valve housing 10 of the suction assembly 800 includes a core housing 101 and a sleeve housing 102 sleeved outside the core housing 101.

[0057] The core housing 101 is provided with a valve chamber 11, an abutment surface 12, an intake port 13, and an exhaust port 14, such as Figure 12 As shown, the core shell 101 also includes a portion of an atmospheric vent 15. (As shown...) Figure 3 As shown, another part of the vent 15 is provided inside the casing 102, and this other part of the vent 15 is used to accommodate the guide wall 231 provided on the cap 23 provided at the top of the sleeve 22. Figure 13 As shown, the outer peripheral surface of the housing 102 is also provided with an annular groove 16, and the top wall of the annular groove 16 is a radially protruding flange 17. Figure 3 As shown, when the suction valve 100 is installed on the handle housing 900, the annular groove 16 of the sleeve 102 is radially limited in the snap-fit ​​groove of the handle housing 900, and the top end of the sleeve 102 extends out of the handle housing 900. The top side groove wall of the annular groove 16 of the sleeve 102, i.e., the flange portion 17, forms an axial installation gap a with the outer wall of the handle housing 900. When the valve stem 20 is not pressed, a person's finger is generally placed on the surface of the handle housing 900. Since the flange portion 17 of the sleeve 102 has an installation gap a from the outer wall of the handle housing 900, the finger can be fixed by the annular groove 16, and the position of the finger is limited by the bottom of the annular groove 16 and the flange portion 17, preventing the finger from moving upwards past the sleeve 102 and touching the cap 23 of the valve stem 20. Therefore, the housing 102 of this structure can be used to effectively prevent fingers from touching the cap 23 provided on the valve stem 20, and prevent fingers from accidentally pressing the cap 23 when moving along the surface of the handle housing 900, thus accidentally adjusting the suction state of the suction valve 100.

[0058] The endoscopes involved in the embodiments of this application may be bronchoscopes, pyeloscopes, esophagoscopes, gastroscopes, colonoscopes, otoscopes, rhinoscopes, oral endoscopes, laryngoscopes, colposcopes, laparoscopes, arthroscopes, etc. The embodiments of this application do not specifically limit the types of endoscopes.

[0059] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0060] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A suction valve comprising a valve housing (10), a valve stem (20) mounted in its valve cavity (11), and a sealing ring (30), said valve stem (20) being controllably switchable between a first position and a second position in the axial direction relative to said valve cavity (11) to switch suction states, characterized in that: The bottom end of the valve cavity (11) in the axial direction is provided with an abutment surface (12). The valve stem (20) has an axially compressible deformation groove (201) on its outer peripheral wall. The sealing ring (30) is installed in the groove, which supports the deformation groove (201) axially and seals the inner peripheral wall of the valve cavity (11) radially. When the valve stem (20) is subjected to axial compression, it can axially compress the deformation groove (201) to axially compress the sealing ring (30) therein, so that it elastically deforms radially outward and presses against the inner peripheral wall of the valve cavity (11). In the first position, the bottom end of the valve stem (20) is disengaged from the contact surface (12) and is in a paused state; In the second position, the bottom end of the valve stem (20) axially presses against the abutment surface (12) and axially compresses the deformation groove (201), thus being in an attractive state.

2. The suction valve according to claim 1, characterized in that: The valve stem (20) is configured as a rod that can be axially compressed. In the second position, the axial compression of the valve stem (20) causes the deformation groove (201) to be axially compressed.

3. The suction valve according to claim 2, characterized in that: The valve stem (20) includes a central rod (21) with a collar (211) in the middle section. A sleeve (22) is provided on one or both ends of the collar (211) and is axially movable and sleeved on the central rod (21). The deformation groove (201) is formed between the end of the sleeve (22) facing the collar (211) and the collar (211).

4. A suction valve according to claim 3, characterized in that: The end face of the collar (211) is provided with a circumferentially extending groove (212), and the axially extending annular skirt (31) provided at the end of the sealing ring (30) is inserted into the groove (212) to maintain its shape and prevent it from falling off. And / or, one end of the sleeve (22) facing away from the collar (211) extends beyond the end of the central rod (21); And / or, the inner circumferential surface of the sealing ring (30) seals against the peripheral wall of the central rod (21); And / or, the sealing ring (30) is integrally disposed on the sleeve (22); And / or, the sleeve (22) is fitted onto the central rod (21) for friction braking through the shaft hole engagement; And / or, the two ends of the sealing ring (30) respectively seal against the corresponding sidewalls of the deformation groove (201).

5. A suction valve according to claim 3, characterized in that: The sleeve (22) includes a sleeve (22) disposed on the central rod (21) at the top end of the collar (211). The top end of the sleeve (22) is located outside the valve cavity (11) and is provided with a cap (23) for pressing by hand. The diameter of the pressing surface of the cap (23) is larger than the diameter of the valve rod (20).

6. A suction valve according to claim 5, characterized in that: The cap (23) is provided with a guide wall (231) extending toward the bottom end of the valve stem (20) around its periphery. The guide wall (231) is inserted into the air vent (15) provided inside the valve housing (10) and forms a gap between the air vent (15) and the air vent (15) to allow air to flow. The middle section of the atmospheric vent (15) forms a turning section (151). In the first position, the bottom end of the guide wall (231) is away from the turning segment (151). In the second position, the bottom end of the guide wall (231) abuts against the inner wall of the turning section (151) to close the air vent (15) at the turning section (151); And / or, the center of the cap (23) is provided with a post (232) extending axially toward the bottom end of the valve stem (20), and the post (232) is inserted into the insertion hole (213) provided at the top center of the central rod (21) for tight fitting.

7. A suction valve according to claim 1, characterized in that: The valve stem (20) includes two deformation grooves (201) arranged sequentially along the axial direction and a mounting groove (202). The mounting groove (202) is equipped with a sealing ring (30) that makes radial sealing contact with the inner peripheral wall of the valve cavity (11). In the first position, the inlet of the transition channel (214) provided in the valve stem (20) is connected to the atmospheric port (15) of the valve housing (10), and the outlet of the transition channel (214) is connected to the discharge port (14) of the valve housing (10). The sealing ring (30) in the mounting groove (202) and the sealing ring (30) in an adjacent deformation groove (201) seal the periphery of the suction port (13) of the valve housing (10). In the second position, the inlet of the transfer channel (214) is connected to the suction port (13), the outlet of the transfer channel (214) is connected to the discharge port (14), and the sealing rings (30) in the two deformation grooves (201) seal the periphery of the suction port (13).

8. An attraction component, characterized in that: It includes a suction nozzle (200), a suction tube (300), and a suction valve (100) as described in any one of claims 1-7, wherein one end of the suction nozzle (200) is connected to a discharge port (14) provided inside the suction valve (100), and one end of the suction tube (300) is connected to a suction port (13) provided inside the suction valve (100).

9. An endoscope, characterized in that: Includes a handle housing (900) and an attraction component (800) as described in claim 8, mounted on the handle housing (900).

10. An endoscope according to claim 9, characterized in that: The valve housing (10) of the suction assembly (800) includes a core housing (101) and a sleeve housing (102) sleeved outside the core housing (101). The top end of the sleeve housing (102) extends out of the handle housing (900) and forms an axial installation gap (A) with the outer wall of the handle housing (900) to prevent fingers from touching the valve stem (20).

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