Connection control switch of closed sputum suction tube and closed sputum suction tube

Abstract

The utility model discloses a connection control switch of a closed sputum suction tube and the closed sputum suction tube, and relates to the technical field of medical instruments. The connection control switch comprises a valve element, the valve element comprises a housing and a core body, the core body is slidably connected into the housing in the first direction, a first sealing ring and a second sealing ring are fixedly arranged on the outer side of the core body so as to be in sealing fit with the housing, an air guide channel is formed in the core body, and a first side hole and a second side hole are formed in the housing. The close ports of the first side hole and the second side hole are completely staggered in the first direction. When the core body moves to a preset blocking position, the close end openings of the air guide channel and the second side hole are completely staggered in the first direction, and in the first direction, the first sealing ring, the end opening, close to the core body, of the first side hole, the second sealing ring and the end opening, close to the core body, of the second side hole are completely staggered and sequentially arranged. And the sealing ring directly faces the suction pressure of the negative pressure device, so that the sealing pressure around the sealing ring is uniform, and the sealing reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a connection control switch for a closed sputum suction tube and the closed sputum suction tube. Background Art

[0002] In medical institutions, due to illness, a large amount of sputum will be secreted in the respiratory tract and lungs. If the sputum is not cleared in time, it will cause sputum crusting, respiratory tract obstruction, and inflammation. Excessive sputum can even cause respiratory arrest. Medical staff must clean it up in time to maintain smooth breathing and reduce the occurrence of respiratory inflammation.

[0003] Suctioning is a treatment method that uses mechanical suction to suck out secretions from the respiratory tract through the mouth, nose or artificial airway to keep the respiratory tract open. During the process of placing a tube in the respiratory tract, the tube will come into contact with the respiratory mucosa when passing through the respiratory tract. Therefore, during the process of placing the tube, it is necessary to disconnect the negative pressure device to avoid damaging the respiratory mucosa. When the suction tube is placed in the designated suction position, it is necessary to connect the negative pressure device to suction. Since there are a large number of bacteria and viruses in sputum, a closed suction tube is generally used for suction to avoid medical infection.

[0004] The negative pressure switch of the closed suction tube is connected to the negative pressure device at one end and the suction tube at the other end. It is a key component for controlling the opening and closing of the negative pressure passage. In the traditional negative pressure switch, when the negative pressure passage is cut off, the sealing ring in the valve core directly covers the corresponding side hole to cut off the passage. However, since the negative pressure may directly act on the sealing ring through the corresponding side hole, it may affect the uniformity of the sealing pressure of the sealing ring around the side hole and affect the resilience of the sealing ring. Long-term use may affect the sealing effect.

[0005] Therefore, how to improve the reliability of sealing is a technical problem that technicians in this field currently need to solve. Utility Model Content

[0006] In view of this, an object of the utility model is to provide a connection control switch for a closed sputum suction tube and a closed sputum suction tube including the connection control switch, which can improve the reliability of sealing.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A connection control switch for a closed sputum suction tube comprises a valve core, the valve core comprises a cover shell and a core body, the core body is slidably connected to the cover shell in a first direction, a first sealing ring and a second sealing ring are fixedly arranged on the outer side of the core body to respectively seal with the cover shell, an air guide channel is arranged on the core body, a first side hole and a second side hole are arranged on the cover shell, and the ports of the first side hole and the second side hole close to each other are completely staggered in the first direction; when the core body moves to a preset open position along the first direction relative to the cover shell, the first side hole is connected to the second side hole through the air guide channel; when the core body moves to a preset blocking position along the first direction relative to the cover shell, the ports of the air guide channel and the second side hole close to each other are completely staggered in the first direction, and in the first direction, the first sealing ring, the port of the first side hole close to the core body, the second sealing ring, and the port of the second side hole close to the core body are completely staggered and arranged in sequence.

[0009] Preferably, the air guide channel is a through hole structure having a single channel which is arranged through the core body along the second direction, and the first side holes and the second side holes are arranged in sequence along the second direction.

[0010] Preferably, the cross-section of each location on the air guiding channel in a direction perpendicular to the second direction is an oblong shape.

[0011] Preferably, on the outer surface of the core body, a first annular groove and a second annular groove are respectively arranged on both sides of the air guide channel in the first direction, the first sealing ring is limited between the two groove side surfaces of the first annular groove in the first direction, and the second sealing ring is limited between the two groove side surfaces of the second annular groove in the first direction.

[0012] Preferably, the core body includes a core body and a pressing boss in sequence in the first direction; the first sealing ring, the air guide channel and the second sealing ring are all arranged on the core body; the pressing boss is fixed to the middle part of the first end face of the core body in the first direction, the pressing boss is slidably connected to the pressing through hole on the cover shell, and the first end face can be abutted against the part of the cover shell located outside the pressing through hole to prevent the core body from escaping from the cover shell through the pressing through hole.

[0013] Preferably, the pressing boss has a plurality of boss side surfaces facing different directions and connected to the first end surface, and a rotation limiting edge is formed between adjacent boss side surfaces, and the rotation limiting edge cooperates with the pressing through hole to prevent the core body from rotating relative to the cover shell.

[0014] Preferably, it also includes a shell, in which a fixing ring is arranged; the valve core also includes an elastic member built into the cover shell, and an opening is arranged at one end of the cover shell in the first direction, and the opening is plug-fitted with the fixing ring and closed by the shell; the elastic member is against between the core body and the shell in the first direction.

[0015] Preferably, it also includes an operating pressure plate hinged to the shell. During the resetting movement of the elastic member, the negative pressure of suction can be overcome and the core body can be pushed to lift the operating pressure plate until the core body moves to the preset blocking position. After being pressed, the operating pressure plate can overcome the elastic force of the elastic member and rotate in the opposite direction, and push the core body to move to the preset opening position.

[0016] Preferably, it also includes a shell, a first connecting pipe and a second connecting pipe; the first connecting pipe passes through the first connecting hole of the shell and docks with the first side hole, and the second connecting pipe passes through the second connecting hole of the shell and docks with the second side hole.

[0017] A closed sputum suction tube comprises the above-mentioned connection control switch, and also comprises a sputum suction catheter and a negative pressure device, wherein one of the sputum suction catheter and the negative pressure device is connected to the first side hole, and the other is connected to the second side hole.

[0018] The utility model provides a connection control switch for a closed sputum suction tube, comprising a valve core, the valve core comprising a cover shell and a core body, the core body being slidably connected to the cover shell in a first direction, a first sealing ring and a second sealing ring being fixedly arranged on the outer side of the core body to respectively seal with the cover shell, an air guide channel being arranged on the core body, a first side hole and a second side hole being arranged on the cover shell, and ports adjacent to the first side hole and the second side hole are completely staggered in the first direction; when the core body moves to a preset open position along the first direction relative to the cover shell, the first side hole is connected to the second side hole via the air guide channel; when the core body moves to a preset blocking position along the first direction relative to the cover shell, ports adjacent to the air guide channel and the second side hole are completely staggered in the first direction, and in the first direction, the first sealing ring, a port of the first side hole close to the core body, the second sealing ring, and a port of the second side hole close to the core body are completely staggered and arranged in sequence.

[0019] When applied to a closed sputum suction tube, one of the sputum suction tube and the negative pressure device is connected to the first side hole, and the other is connected to the second side hole. After the core moves to the preset blocking position, the first sealing ring and the second sealing ring are staggered with the first side hole and the second side hole, and the sealing positions of the first sealing ring and the second sealing ring are both outside the coverage of the first side hole and the second side hole. The first sealing ring and the second sealing ring will not directly face the suction pressure of the negative pressure device, which can reduce the influence of the suction pressure of the negative pressure device on the first sealing ring and the second sealing ring, which is conducive to ensuring uniform sealing pressure around the first sealing ring and the second sealing ring, and can effectively maintain the sealing ability after repeated use, improve the reliability of the seal, and ensure the safety and effectiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] FIG1 is an overall cross-sectional view of a switch of a specific embodiment 1 of a connection control switch provided by the present invention;

[0022] FIG2 is an exploded view of a specific embodiment 1 of the connection control switch provided by the present utility model;

[0023] FIG3 is an overall cross-sectional view of the sputum suction passage in the open state of the first specific embodiment of the connection control switch provided by the utility model, wherein the solid arrow indicates the direction of negative pressure sputum suction, and the hollow arrow indicates the direction of pressing the operation panel to open the sputum suction passage;

[0024] FIG4 is an overall cross-sectional view of the first embodiment of the connection control switch provided by the utility model in a sputum suction passage blocking state, wherein the solid arrow indicates the direction of negative pressure sputum suction, and the hollow arrow indicates the direction in which the operation panel is released and the elastic member pops up to block the sputum suction passage;

[0025] FIG5 is a perspective view of a valve core of a specific embodiment 1 of a connection control switch provided by the present invention;

[0026] FIG6 is a top view of the housing of the first specific embodiment of the connection control switch provided by the present invention;

[0027] FIG7 is a cross-sectional view along the AA position of FIG6;

[0028] FIG8 is an overall view of a specific embodiment 1 of the closed sputum suction tube provided by the present invention.

[0029] Reference numerals:

[0030] 1-Operate the pressure plate;

[0031] 2-housing, 21-side housing, 22-bottom plate, 221-fixing ring;

[0032] 3-valve core, 31-cover, 311-first side hole, 312-second side hole, 313-pressing through hole, 314-opening, 32-core body, 321-first ring groove, 322-second ring groove, 323-air guide channel, 324-core body, 3241-first end face, 3242-second end face, 325-pressing boss, 3251-rotation limiting edge, 3252-boss side, 33-first sealing ring, 34-second sealing ring, 35-elastic member;

[0033] 4-First takeover;

[0034] 5-Second takeover;

[0035] 6-Suction catheter;

[0036] 7-Connection joint;

[0037] 8-Protective soft film;

[0038] X-first direction, Y-second direction. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] The core of the utility model is to provide a connection control switch of a closed sputum suction tube and a closed sputum suction tube including the connection control switch, which can improve the reliability of sealing.

[0041] The first specific embodiment of the connection control switch for a closed sputum suction tube provided by the utility model, please refer to FIGS. 1 to 8 , includes a valve core 3 .

[0042] The valve core 3 includes a housing 31 and a core 32. The core 32 is slidably connected to the housing 31 in a first direction X. A first sealing ring 33 and a second sealing ring 34 are fixedly arranged on the outer side of the core 32, so as to realize a sealing fit between the core 32 and the housing 31 through the first sealing ring 33 and the second sealing ring 34 respectively.

[0043] The core 32 is provided with an air guide channel 323, the cover 31 is provided with a first side hole 311 and a second side hole 312, and the adjacent ports of the first side hole 311 and the second side hole 312 are completely staggered in the first direction X. Wherein, unless otherwise specified, the complete staggering between structures in a certain direction means that the overlapping area of ​​the cross section perpendicular to the direction is 0.

[0044] When the core 32 moves to a preset open position relative to the housing 31 along the first direction X, the first side hole 311 is connected to the second side hole 312 via the air guide channel 323. When the core 32 moves to a preset blocking position relative to the housing 31 along the first direction X, the ports of the air guide channel 323 and the second side hole 312 that are close to each other (i.e., the right port of the air guide channel 323 and the left port of the second side hole 312 in the orientation of FIG. 1) are completely staggered in the first direction X, and in the first direction X, the first sealing ring 33, the port of the first side hole 311 close to the core 32 (i.e., the right port of the first side hole 311 in the orientation of FIG. 1), the second sealing ring 34, and the port of the second side hole 312 close to the core 1, the left port of the second side hole 312 is completely staggered and arranged in sequence. At this time, the ports close to the air guide channel 323 and the second side hole 312 are blocked by the second sealing ring 34, that is, in the orientation of FIG. 1, the right port of the air guide channel 323 and the left port of the second side hole 312 are blocked by the second sealing ring 34 and are respectively located on the upper and lower sides of the second sealing ring 34, so that the second side hole 312 and the air guide channel 323 as well as the second side hole 312 and the first side hole 311 cannot be ventilated.

[0045] When applied to a closed sputum suction tube, one of the sputum suction tube 6 and the negative pressure device is connected to the first side hole 311, and the other is connected to the second side hole 312. After the core 32 moves to the preset blocking position, the first sealing ring 33 and the second sealing ring 34 are staggered with the first side hole 311 and the second side hole 312, and the sealing positions of the first sealing ring 33 and the second sealing ring 34 are both located outside the coverage of the first side hole 311 and the second side hole 312. The first sealing ring 33 and the second sealing ring 34 will not directly face the suction pressure of the negative pressure device, which can reduce the influence of the suction pressure of the negative pressure device on the first sealing ring 33 and the second sealing ring 34, which is conducive to ensuring uniform sealing pressure around the first sealing ring 33 and the second sealing ring 34, and can effectively maintain the sealing ability after repeated use, improve the reliability of sealing, and ensure the safety and effectiveness of product use.

[0046] To improve the smoothness of ventilation of the air guide channel 323, as shown in FIG5, the air guide channel 323 is a through hole structure having a single channel that is arranged along the second direction Y on the core body 32, and the first side hole 311 and the second side hole 312 are arranged in sequence along the second direction Y. The first direction X and the second direction Y are perpendicular straight line directions. In other embodiments, the first direction X and the second direction Y may also have other angles, or the second direction Y may also be an arc direction.

[0047] Specifically, each location on the air guiding channel 323 has a cross section perpendicular to the second direction Y in an oblong shape, and each location on the air guiding channel 323 may specifically refer to each location in the second direction Y. In addition, in other embodiments, the oblong shape may be replaced by a rectangle, a circle, or other shapes.

[0048] In the present embodiment, since the air guide channel 323 has only a single channel without branches and is empty inside, it can ensure the smoothness of ventilation. In particular, compared with the common implementation method in the prior art of setting a middle column in the middle of the core body 32 and forming a ring-shaped airway around the middle column as the air guide channel, in the present embodiment, since there is no obstruction of the middle column, the negative pressure channel will not be affected by the internal structure of the air guide channel 323, making sputum suction smoother.

[0049] In order to improve the installation stability of the sealing ring, as shown in FIG4 and FIG5, a first annular groove 321 and a second annular groove 322 are respectively provided on the outer surface of the core body 32 on both sides of the air guide channel 323 in the first direction X. Among them, the first sealing ring 33 is limited between the two groove sides of the first annular groove 321 in the first direction X, and the second sealing ring 34 is limited between the two groove sides of the second annular groove 322 in the first direction X. Since the annular groove can fully limit the inner sealing ring in the first direction X, the installation stability of the first sealing ring 33 and the second sealing ring 34 can be improved, thereby ensuring that the sealing ring can move with the core body 32 in the first direction X and ensure reliable sealing at the set position.

[0050] To facilitate the adjustment of the position of the core 32, as shown in Figures 4 to 7, the core 32 includes a core body 324 and a pressing boss 325 in the first direction X. The first sealing ring 33, the air guide channel 323 and the second sealing ring 34 are all arranged on the core body 324. The pressing boss 325 is fixed to the middle of the first end face 3241 of the core body 324 in the first direction X, and the first end face 3241 and the pressing boss 325 form a stepped structure. The pressing boss 325 is slidably connected to the pressing through hole 313 on the cover 31, and the first end face 3241 can be abutted against the part of the cover 31 located outside the pressing through hole 313 to prevent the core 32 from escaping from the cover 31 through the pressing through hole 313. By adding a pressing boss 325 extending out of the cover 31 through the pressing through hole 313, the pressing boss 325 can be easily pressed to switch the position of the core 32.

[0051] Specifically, as shown in Fig. 5 and Fig. 6, the pressing boss 325 has a plurality of boss side surfaces 3252 facing different directions and docking with the first end surface 3241, and a rotation-limiting edge 3251 is formed between adjacent boss side surfaces 3252, and the rotation-limiting edge 3251 cooperates with the pressing through hole 313 to prevent the core 32 from rotating relative to the housing 31. The cross section of the pressing boss 325 in the direction perpendicular to the first direction X is the same as the shape of the pressing through hole 313, and optionally, the pressing through hole 313 is a rectangular hole, and the pressing boss 325 is a flat boss with a dimension in one direction larger than that in another direction, and in addition, one end of the flat boss away from the first end surface 3241 is an arc surface.

[0052] By setting the rotation limit between the pressing boss 325 and the pressing through hole 313, the core body can be effectively prevented from rotating in the cover shell 31, ensuring that when the valve core is opened, the air guide channel 323 can connect the first side hole 311 and the second side hole 312, avoiding the air guide channel 323 from being misaligned with the first side hole 311 and the second side hole 312 due to rotation.

[0053] To facilitate the assembly of the valve core 3, as shown in FIG. 2 and FIG. 7, the connection control switch includes a housing 2, and a fixing ring 221 is arranged inside the housing 2. Specifically, the housing 2 includes an annular side shell 21 and a bottom plate 22 fixed to a port of the side shell 21 in the first direction X, and the fixing ring 221 is fixed to the bottom plate 22. As shown in FIG. 1, the valve core 3 also includes an elastic member 35 built into the cover 31, and an opening 314 is arranged at one end of the cover 31 in the first direction X. Specifically, the pressing through hole 313 and the opening 314 are located at both ends of the cover 31 in the first direction X. The opening 314 is plugged with the fixing ring 221 and the opening 314 is closed by the housing 2. Specifically, the cover 31 is plugged into the fixing ring 221. The elastic member 35 is pressed between the core 32 and the housing 2 in the first direction X, and the elastic member 35 is specifically a compression spring. The plug-in sealing cooperation between the cover 31 and the fixing ring 221 facilitates installation.

[0054] In addition, specifically, the two end faces of the core body 324 in the first direction X are respectively the first end face 3241 and the second end face 3242, the second end face 3242 is arranged on the side close to the fixing ring 221, and in the first direction X, the first sealing ring 33 and the second sealing ring 34 are arranged in sequence along the direction close to the fixing ring 221, and the housing 31 has an installation cavity for installing the elastic member 35 on one side of the second sealing ring 34 in the first direction X, and the first sealing ring 33 is located on the other side of the first sealing ring 33. When the core body 32 is in the preset open position, the installation cavity is a sealed cavity, and when the core body 32 is in the preset blocking position, the installation cavity is connected to the external space only through the second side hole 312.

[0055] To facilitate the reset movement of the core 32 in the first direction X, as shown in FIG3 and FIG4, the connection control switch also includes an operating plate 1 hinged to the housing 2. During the reset movement of the elastic member 35, the negative pressure of suction can be overcome and the core 32 can be pushed to lift the operating plate 1 until the core 32 moves to the preset blocking position. After the operating plate 1 is pressed, it can overcome the elastic force of the elastic member 35 and rotate in the opposite direction, and push the core 32 to the preset open position. By adding the operating plate 1, the operating area can be increased compared to directly pressing the pressing boss 325.

[0056] To facilitate external connection with other devices, the connection control switch further includes a first pipe 4 and a second pipe 5. The first pipe 4 passes through the first connection hole of the housing 2 and docks with the first side hole 311, and the second pipe 5 passes through the second connection hole of the housing 2 and docks with the second side hole 312.

[0057] Among them, optionally, as shown in FIG8 , one end of the first connecting pipe 4 extending out of the shell 2 can be connected to the sputum suction catheter 6 at the patient end, and the other end of the sputum suction catheter 6 is connected to the connecting joint 7 connected to the patient, and the sputum suction catheter 6 can be covered with a protective soft cover 8, and the end of the second connecting pipe 5 extending out of the shell 2 can be connected to a suction device such as a negative pressure device. Of course, in other embodiments, the end of the first connecting pipe 4 extending out of the shell 2 can also be connected to a suction device such as a negative pressure device, and the end of the second connecting pipe 5 extending out of the shell 2 can be connected to the sputum suction catheter 6 at the patient end.

[0058] The connection control switch in this embodiment is applied to a closed suction tube, and its working principle includes: connecting the closed suction tube to the patient's respiratory system, and checking whether the operating pressure plate 1 is in the pop-up position, wherein due to the elastic force of the elastic member 35, in the initial state, the core body 32 of the valve core 3 pops up, and the operating pressure plate 1 is in the pop-up position shown in Figure 4, and the second sealing ring 34 is located between the first side hole 311 connected to the suction tube 6 and the second side hole 312 connected to the suction device, blocking the suction channel, that is, the connection control switch is in a closed blocking state, and the port of the second connecting pipe 5 is connected to the negative pressure device. When in use, insert the suction catheter 6 into the corresponding position of the patient's respiratory tract, press the operating pressure plate 1 to make the core body 32 move downward, and the second sealing ring 34 leaves the position between the first side hole 311 and the second side hole 312. At this time, as shown in Figure 3, the suction passage between the first side hole 311, the air guide channel 323 and the second side hole 312 is opened, and suction is started. After the suction is completed, as shown in Figure 4, release the operating pressure plate 1 to block the suction passage again, pull out the suction catheter 6, disconnect the closed suction tube from the patient, and suction is completed.

[0059] By continuously switching between the two operations of pressing down the core body 32 by operating the pressing plate 1 and bouncing up the core body 32 by the elastic member 35, the second sealing ring 34 can reach a designated sealing position according to treatment needs, open or block the corresponding suction channel, and achieve the purpose of suctioning sputum.

[0060] The connection control switch in this embodiment includes the following beneficial effects: the first side hole 311 and the second side hole 312 have a height difference in the first direction X, and the movement of the core 32 drives the first sealing ring 33 and the second sealing ring 34 to move synchronously in the first direction X, thereby realizing the channel for connecting the closed sputum suction tube and the suction equipment, which is convenient for medical staff to perform sputum suction operations, wherein, the sealing ring is shifted and sealed relative to the first side hole 311 and the second side hole 312, and the sealing position is staggered and deviated from the first side hole 311 and the second side hole 312, which can ensure that the pressure around the sealing position is uniform, thereby ensuring The sealing performance can be ensured, and the patient's respiratory mucosa can be effectively protected from the influence of negative pressure during the suction tube placement process, and the risk of leakage caused by the elastic first sealing ring 33 and the second sealing ring 34 failing to rebound in time due to multiple suctions when the first sealing ring 33 and the second sealing ring 34 are directly aimed at the side hole; by setting a single-channel air guide channel 323 in the core body 32, the resistance structure inside the air guide channel 323 is reduced, the resistance of the suction passage is reduced, and the suction is smoother; the structure of the connection control switch is simple, and each component can be produced separately, and the product assembly is simple.

[0061] In addition to the above-mentioned connection control switch, the utility model also provides a closed sputum suction tube, which includes a connection control switch. The connection control switch can be specifically a connection control switch provided in any of the above embodiments, and the beneficial effects can be referred to the above embodiments accordingly. The connection control switch is a negative pressure switch in the closed sputum suction tube. As shown in Figure 8, it also includes a sputum suction catheter 6 and a negative pressure device, one of which is connected to the first side hole 311, and the other is connected to the second side hole 312.

[0062] It should be noted that when an element is referred to as "fixed" to another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an element in the middle at the same time. In addition, in the description of the present utility model, unless otherwise specified, "multiple", "multiple roots", and "multiple groups" mean two or more.

[0063] The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0065] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0066] The above is a detailed introduction to the closed sputum suction tube and its connection control switch provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A connection control switch for a closed sputum suction tube, characterized in that: The valve core (3) comprises a cover shell (31) and a core body (32); the core body (32) is slidably connected to the cover shell (31) in a first direction (X); a first sealing ring (33) and a second sealing ring (34) are fixedly arranged on the outer side of the core body (32) to respectively cooperate with the cover shell (31) in a sealing manner; an air guide channel (323) is arranged on the core body (32); the cover shell (31) is provided with a first side hole (311) and a second side hole (312); and adjacent ports of the first side hole (311) and the second side hole (312) are completely staggered in the first direction (X); When the core (32) moves relative to the cover shell (31) along the first direction (X) to a preset open position, the first side hole (311) is connected to the second side hole (312) via the air guide channel (323); When the core body (32) moves relative to the cover shell (31) along the first direction (X) to a preset blocking position, the ports of the air guide channel (323) and the second side hole (312) close to each other are completely staggered in the first direction (X), and in the first direction (X), the first sealing ring (33), the port of the first side hole (311) close to the core body (32), the second sealing ring (34), and the port of the second side hole (312) close to the core body (32) are completely staggered and arranged in sequence.

2. The connection control switch according to claim 1, characterized in that: The air guide channel (323) is a through hole structure having a single channel and is arranged on the core body (32) along the second direction (Y), and the first side hole (311) and the second side hole (312) are arranged in sequence along the second direction (Y).

3. The connection control switch according to claim 2, characterized in that: The cross-sections of all locations on the air guide channel (323) in a direction perpendicular to the second direction (Y) are oblong.

4. The connection control switch according to claim 1, characterized in that: A first annular groove (321) and a second annular groove (322) are respectively provided on the outer surface of the core body (32) on both sides of the air guide channel (323) in the first direction (X); the first sealing ring (33) is limited between two groove side surfaces of the first annular groove (321) in the first direction (X); and the second sealing ring (34) is limited between two groove side surfaces of the second annular groove (322) in the first direction (X).

5. The connection control switch according to claim 1, characterized in that: The core body (32) comprises a core body (324) and a pressing boss (325) in sequence in the first direction (X); the first sealing ring (33), the air guide channel (323) and the second sealing ring (34) are all arranged on the core body (324); the pressing boss (325) is fixed to the middle part of the first end surface (3241) of the core body (324) in the first direction (X); the pressing boss (325) is slidably connected to the pressing through hole (313) on the cover shell (31), and the first end surface (3241) can abut against a portion of the cover shell (31) located outside the pressing through hole (313) to prevent the core body (32) from escaping from the cover shell (31) through the pressing through hole (313).

6. The connection control switch according to claim 5, characterized in that: The pressing boss (325) has a plurality of boss side surfaces (3252) facing different directions and docking with the first end surface (3241), and rotation limiting edges (3251) are formed between adjacent boss side surfaces (3252), and the rotation limiting edges (3251) cooperate with the pressing through hole (313) to prevent the core (32) from rotating relative to the cover shell (31).

7. The connection control switch according to any one of claims 1 to 6, characterized in that: It also comprises a shell (2), wherein a fixing ring (221) is arranged inside the shell (2); the valve core (3) further comprises an elastic member (35) built into the cover shell (31); an opening (314) is arranged at one end of the cover shell (31) in the first direction (X), the opening (314) is plug-fitted with the fixing ring (221) and is closed by the shell (2); the elastic member (35) abuts between the core body (32) and the shell (2) in the first direction (X).

8. The connection control switch according to claim 7, characterized in that: It also includes an operating pressure plate (1) hinged to the shell (2); during the resetting movement of the elastic member (35), the negative suction pressure can be overcome and the core (32) can be pushed to lift the operating pressure plate (1) until the core (32) moves to the preset blocking position; after being pressed, the operating pressure plate (1) can overcome the elastic force of the elastic member (35) and rotate in the opposite direction, thereby pushing the core (32) to move to the preset opening position.

9. The connection control switch according to any one of claims 1 to 6, characterized in that: It also comprises a shell (2), a first connecting pipe (4) and a second connecting pipe (5); the first connecting pipe (4) passes through the first connecting hole of the shell (2) and is connected to the first side hole (311), and the second connecting pipe (5) passes through the second connecting hole of the shell (2) and is connected to the second side hole (312).

10. A closed sputum suction tube, characterized in that: The connection control switch comprises the connection control switch according to any one of claims 1 to 9, and further comprises a sputum suction catheter (6) and a negative pressure device, wherein one of the sputum suction catheter (6) and the negative pressure device is connected to the first side hole (311), and the other is connected to the second side hole (312).

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