Sample collection rod for diagnostic device, and diagnostic device

Abstract

The utility model aims to provide a sample collecting rod of a diagnostic device and the diagnostic device, and the sample collecting rod comprises a head part for sampling; one end of the columnar part is connected with the head part, and the other end is connected with the tail part; the limiting part is arranged in the circumferential direction of the columnar part; the limiting stopper and the flexible sealing ring are sequentially arranged on the columnar part in a sleeving manner; wherein the limiting stopper is used for being in clamping connection with the circumferential direction of a containing channel in the diagnosis device under the extrusion effect of the limiting part after the head reaches a collection station in the diagnosis device to be inserted, so that when the head is pulled out, the flexible sealing ring is separated under the limiting effect of the limiting stopper and is reserved in the containing channel. Compared with the prior art, the sample collection rod of the diagnostic device and the diagnostic device provided by the utility model have the advantages that the diagnostic device can be conveniently assembled, and meanwhile, the detection operation can also be conveniently carried out.

Description

Technical Field

[0001] This utility model relates to a medical device, and more particularly to a sample collection rod and a diagnostic device for a diagnostic apparatus. Background Technology

[0002] Feces are commonly used samples in clinical testing. For example, fecal occult blood testing can be used to diagnose gastrointestinal bleeding and is also a major method for colorectal cancer screening. Helicobacter pylori antigen testing, norovirus antigen testing, and rotavirus testing are commonly used to diagnose infectious diseases. The routine procedure for fecal testing involves the patient collecting a stool sample into a sampling bottle or cup, which is then mixed with a diluent before being added to a test card.

[0003] To optimize automated fecal testing, patent application CN 213580137 U discloses a fecal collection device with detection function, mainly including a circular tube for mixing samples, a box for holding test strips, a base for fixing the two, and a conduit connecting the two. This device mixes the fecal sample mechanically and connects the sample mixing tube and the test strip through a one-way valve conduit. However, it has drawbacks such as a relatively complex overall design and poor sealing that affects the test results of the test strips. Another example is a tubular device for integrated fecal sampling and occult blood detection disclosed in patent application CN206523509 U. This device uses a piston-like sealing method to prevent liquid leakage, but it requires placing the test strips in a special test strip holder and then fixing them in the device by welding, making assembly difficult. Furthermore, during assembly, a sealing ring needs to be fitted onto the sampling rod to seal the liquid reaction chamber during sampling. However, if the sealing ring is not removed before sampling, the airflow between the liquid reaction chamber containing the liquid reagent and the detection chamber containing the test strip may be obstructed due to the sealing ring after insertion. This results in the reagent not flowing out of the liquid reaction chamber normally, or only a small amount of reagent, into the detection chamber containing the test strip. Consequently, the reaction result cannot be accurately displayed on the test strip, thus affecting the accuracy of the detection.

[0004] Therefore, it is necessary to provide a sample collection device and a diagnostic device that can facilitate the assembly of the diagnostic device and the testing operation. Utility Model Content

[0005] In view of the shortcomings or deficiencies of the prior art, the technical problem to be solved by this utility model is how to provide a sample collection rod and diagnostic device that can facilitate the assembly of the diagnostic device and the detection operation.

[0006] To solve the above-mentioned technical problems, this utility model provides a sample collection rod for a diagnostic device, comprising:

[0007] Header used for sampling;

[0008] A columnar portion connected at one end to the head and at the other end to the tail;

[0009] A limiting portion disposed in the circumferential direction of the columnar portion;

[0010] A limiter and a flexible sealing ring are sequentially fitted onto the columnar portion;

[0011] The limiter is used to circumferentially lock into the receiving channel in the diagnostic device after the head reaches the acquisition station in the diagnostic device to be inserted, under the squeezing action of the limiting part, so that when the head is removed, the flexible sealing ring is disengaged under the limiting action of the limiter and remains in the receiving channel.

[0012] Furthermore, preferably, the clamping connection is formed by any one or a combination of extrusion deformation, friction contact, or snap-fit ​​structure.

[0013] Furthermore, preferably, the diameter of the end of the columnar portion used to connect to the head is larger than the diameter of the through hole of the flexible sealing ring.

[0014] Furthermore, preferably, the diameter of the end of the columnar portion used to connect to the head is larger than the diameter of the head;

[0015] Furthermore, as a preferred embodiment, the head described above is provided with a threaded groove in the circumferential direction.

[0016] Further, preferably, after the flexible sealing ring detaches from the columnar portion and the head passes through the receiving channel again, touching the flexible sealing ring will cause the flexible sealing ring to tilt or fall into the liquid reaction chamber connected to the receiving channel within the diagnostic device.

[0017] Further, preferably, the limiter is a hollow plastic part or a hollow elastic part.

[0018] Furthermore, preferably, the flexible sealing ring is a rubber sealing ring or a silicone sealing ring.

[0019] Furthermore, preferably, the flexible sealing ring is a switch sealing ring.

[0020] Further, as a preferred embodiment, the hardness of the flexible sealing ring is 60-65.

[0021] This application also provides a diagnostic device, including: the above-mentioned sample collection rod.

[0022] Further, as a preferred embodiment, the diagnostic device includes: a housing, a cover detachably connected to the housing; wherein the housing contains the receiving channel and a liquid reaction chamber.

[0023] Further, preferably, the housing includes: a main housing having the liquid reaction chamber and the detection chamber, and a valve base detachably connected to the main housing, wherein the detection chamber is used to insert test strips and / or drying sheets; the liquid reaction chamber and the detection chamber are separated from each other by a first partition; and the valve base is provided with a valve switch for controlling the on / off connection between the liquid reaction chamber and the detection chamber.

[0024] Furthermore, as a preferred embodiment, the detection chamber is provided with grooves for inserting test strips and drying sheets, respectively.

[0025] Furthermore, as a preferred embodiment, the cover is provided with a protruding limiting structure for achieving the detachable connection with the housing;

[0026] Furthermore, preferably, the cover and the tail are connected by welding.

[0027] Further, as a preferred embodiment, the test strip includes: an insertion portion having a hollow area, and a covering portion perpendicularly connected to the insertion portion and used to cover the detection cavity; an observation window is provided on the side of the housing adjacent to the test strip;

[0028] And / or, the cover body is provided with a groove for inserting the tail.

[0029] Further, as a preferred embodiment, the valve base includes: a first cavity communicating with the liquid reaction chamber, a second cavity communicating with the detection chamber, a second partition for separating the first cavity and the second cavity, a connecting hole opened on the second partition, a guide component connected to the connecting hole and forming a flow channel, and a valve component for slidingly inserting into the flow channel;

[0030] The valve component has a first sealing element fitted on one end of its valve core. When the valve core slides to the closed position, the first sealing element closes the communication hole, thereby cutting off the communication between the first cavity and the second cavity. When the valve core is in the open position, the communication hole is opened.

[0031] The valve component is further fitted with a second sealing element on the other end of the valve core, so that when the valve core slides in the flow channel, it always isolates the fluid in the first cavity from the outside.

[0032] When the valve component slides to the closed position, it engages with the valve base, and the direction of engagement is perpendicular to the insertion direction of the rod.

[0033] And / or, the sliding direction of the valve switch is unidirectional and faces the first cavity side;

[0034] And / or, the opening at the upper end of the receiving channel is funnel-shaped.

[0035] Compared with the prior art, the sample collection rod and diagnostic device provided in this application can facilitate the assembly of the diagnostic device and the detection operation. Attached Figure Description

[0036] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0037] Figure 1 : A schematic diagram of the assembly structure of the sample collection rod in the first embodiment of this utility model;

[0038] Figure 2 : A schematic diagram of the internal cross-sectional structure of the diagnostic device in the first embodiment of this utility model;

[0039] Figure 3 : A schematic diagram of the main housing structure in the first embodiment of this utility model;

[0040] Figure 4 : A schematic diagram of the structure of the cover in the first embodiment of this utility model;

[0041] Figure 5 Schematic diagram of the valve component in the first embodiment of this utility model Figure 1 ;

[0042] Figure 6 Schematic diagram of the valve component in the first embodiment of this utility model Figure 2 ;

[0043] Figure 7 Schematic diagram of the valve base in the first embodiment of this utility model Figure 1 ;

[0044] Figure 8 : A schematic diagram of the structure of the test strip in the first embodiment of this utility model;

[0045] Figure 9 : A schematic diagram of the assembly structure of the sample collection rod in the second embodiment of this utility model;

[0046] Reference numerals: cover 11, groove 111, shell 12, sample collection rod 2, head 21, columnar part 22, columnar part 22', tail 23, limiter 25, flexible sealing ring 24, main shell 121, valve base 122, first partition 123, liquid reaction chamber 1201, detection chamber 1202, first chamber 12201, second chamber 12202, valve component 1221, second partition 1222, connecting hole 1223, first seal 1224, second seal 1225, observation window 1211, test strip 6, insertion part 61, hollow area 611, cover part 62, protruding limiting structure 112, concave part 1226, protruding part 1225. Detailed Implementation

[0047] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model.

[0048] Example 1

[0049] like Figures 1 to 8 As shown, the first embodiment of this utility model provides a sample collection rod 2, which mainly consists of a head 21 for sampling, a columnar part 22 connected to the head 21 at one end and to the tail 23 at the other end, a limiting part (not shown in the figure) provided in the circumferential direction of the columnar part 22, and a limiting device 25 and a flexible sealing ring 24 sequentially sleeved on the columnar part 22.

[0050] The aforementioned limiter 25 is used to clamp the head 21 to the circumferential accommodating channel in the diagnostic device after the head 21 reaches the acquisition station in the diagnostic device to be inserted, under the squeezing action of the limiting part, so that when the head 21 is removed, the flexible sealing ring 24 is disengaged under the limiting action of the limiter 25 due to friction or clamping connection, and remains in the accommodating channel.

[0051] Additionally, it should be noted that the samples collected by head 21 are only exemplified by feces and other excrement, to facilitate clinical testing of the collected excrement. Obviously, the samples collected by head 21 in this embodiment can also be other types, such as other test materials that can be used for clinical diagnosis; however, specific limitations and details will not be provided here.

[0052] As can be seen from the above structure, in this embodiment, by fitting a limiter 25 onto the cylindrical part 22 of the sample collection rod 2, the limiter 25 and the flexible sealing ring 24 can be sequentially fitted onto the cylindrical part 22 before assembly. After the sample collection rod 2 is inserted into the receiving channel of the diagnostic device, when the sample collection rod 2 reaches the collection position, the limiter 25 will be circumferentially locked into the receiving channel of the diagnostic device by the squeezing and friction of the limiting part, thus staying in the receiving channel. The sealing ring can achieve the sealing of the receiving channel, and with the help of air pressure, it can prevent the liquid located below the receiving channel from leaking from the liquid reaction chamber 1201 into the detection chamber where the test strip 6 is located.

[0053] Furthermore, when the sample collection rod 2 is removed, its head 21 and columnar part 22 are directly pulled out, while the flexible sealing ring 24 automatically remains in the receiving channel due to the obstruction of the limiter 25. Therefore, when the sample collection rod 2 has collected the sample, such as feces, before re-inserting it into the receiving channel, there is no need to remove the sealing ring. Simply inserting it into the receiving channel will cause the sealing ring to automatically detach, for example, by the head 21 of the sample collection rod 2 touching or squeezing the flexible sealing ring 24, causing the flexible sealing ring 24 to fall out of the receiving channel. The liquid reaction chamber 1201 of the diagnostic device is inclined within the accommodating channel, thereby maintaining communication between the liquid reaction chamber 1201 and the external air. Due to the effect of air pressure balance, the liquid can flow smoothly within the liquid reaction chamber 1201. By shaking the device, the sample can be fully dissolved in the diluent and flow into the connected detection chamber 1202. Therefore, the sample collection rod 2 provided in this embodiment can facilitate the assembly of the diagnostic device and the detection operation, making it more convenient to use.

[0054] Furthermore, as a preferred embodiment, the above-mentioned clamping connection can be formed by any one or a combination of extrusion deformation, friction contact, or snap-fit ​​structure. This embodiment only uses extrusion deformation as an example for illustration.

[0055] Furthermore, preferably, the diameter of the end of the columnar portion 22 used to connect to the head 21 is larger than the diameter of the through hole of the flexible sealing ring 24, so that the sealing ring needs to be manually operated or otherwise operated by external force to be put on the columnar portion 22 for fixing the limiter 25, and in subsequent processes, its end can be held by the head 21.

[0056] Furthermore, preferably, the diameter of the end of the columnar portion 22 used to connect to the head 21 is larger than the diameter of the head 21, so that the collected material attached to the head 21 can smoothly pass through the limiter 25 and the sealing ring along with the head 21.

[0057] Furthermore, preferably, the aforementioned limiter 25 is a plastic or elastic part with a hollow cavity, wherein the hollow cavity is used to pass through the columnar portion 22.

[0058] The diameter of the hollow cavity is larger than the maximum diameter of the columnar part 22 and the inner diameter of the through hole of the sealing ring, so as to ensure that the columnar part 22 can pass through the hollow cavity well and be locked on the sample collection rod 2 by the sealing ring. It can also better hold the end face of the sealing ring when the head 21 is removed after the sealing ring is trapped in the accommodating channel, thereby realizing the separation of the sealing ring from the head 21. When the head 21 is reinserted, the head 21 can hold the end of the sealing ring, thereby causing the sealing ring to tilt or fall out of the accommodating channel.

[0059] Furthermore, as a preferred embodiment, the head 21 is provided with a threaded groove in the circumference to facilitate sampling.

[0060] Further, preferably, after the flexible sealing ring 24 is detached from the columnar portion 22 and after the head 21 passes through the receiving channel again, it touches the flexible sealing ring 24 so that the flexible sealing ring 24 tilts or falls into the liquid reaction chamber 1201 connected to the receiving channel in the diagnostic device.

[0061] Furthermore, preferably, the main housing 121 is a transparent housing.

[0062] Further, as a preferred embodiment, the flexible sealing ring 24 is a rubber sealing ring or a silicone sealing ring.

[0063] Further, as a preferred embodiment, the hardness of the flexible sealing ring is 60-65, for example 60, to increase the probability of error tolerance.

[0064] In addition, it is worth mentioning that the flexible sealing ring in this embodiment is preferably a switch sealing ring.

[0065] Furthermore, preferably, the diagnostic device is an integrated excrement detection device, such as an integrated fecal detection device, wherein the diagnostic device includes: a liquid reaction chamber 1201 with liquid reagent, a detection chamber 1202 with test strip 6, and a flow channel for connecting the liquid reaction chamber 1201 and the detection chamber 1202 and whose on / off state can be controlled.

[0066] Furthermore, as a preferred embodiment, the tail 23 of the sample collection rod 2 is designed with a cross structure, which increases aesthetics and reduces the amount of raw materials used.

[0067] Further, as a preferred embodiment, the diagnostic device includes: a housing 12 and a cover 11 detachably connected to the housing 12. The housing 12 contains a receiving channel and a liquid reaction chamber 1201. The detachable connection between the cover 11 and the housing 12 forms a sealed connection to prevent internal liquid leakage.

[0068] Further, preferably, the housing 12 includes: a main housing 121 having a liquid reaction chamber and a detection chamber 1202, and a valve base 122 detachably connected to the main housing 121, wherein the detection chamber 1202 is used to insert test strips 6 and / or drying sheets (not shown in the figure); the liquid reaction chamber and the detection chamber 1202 are separated from each other by a first partition 123; the valve base 122 is provided with a valve switch for controlling the on / off connection between the liquid reaction chamber 1201 and the detection chamber 1202.

[0069] By placing the test strip 6 and the drying strip inside the detection chamber 1202, not only can the position of the test strip 6 be fixed, but an independent detection unit can also be formed, which facilitates the assembly efficiency of the test strip 6 and the strip insert and the reading of the detection results. At the same time, it ensures that the test strip 6 is in a suitable humidity environment to increase its shelf life.

[0070] The combination of the sealing ring limiting device and the drying strip ensures both the functional reliability of the integrated testing device and the performance stability of the test strip 6.

[0071] Further, as a preferred embodiment, the test strip 6 includes: an insertion part 61 with a hollow area 611, a covering part 62 perpendicularly connected to the insertion part 61 and used to cover the detection cavity 1202; and an observation window 1211 is provided on the side of the housing 12 adjacent to the test strip 6.

[0072] Furthermore, as a preferred embodiment, the cover 11 is provided with a protruding limiting structure 112 for detachably connecting with the housing 12.

[0073] Furthermore, as a preferred embodiment, the cover 11 and the tail 23 are connected by welding, such as ultrasonic welding, to enhance the stability of the structure.

[0074] Furthermore, as a preferred embodiment, the main housing 121 is a transparent housing 12 for easy observation. The test strip 6 is preferably a non-transparent structure.

[0075] Furthermore, as a preferred embodiment, the cover 11 is provided with a groove 111 for inserting the tail 23, wherein the groove 111 is formed by a welded cylindrical member or an integrally formed concave structure on the cover 11.

[0076] Further, as a preferred embodiment, the valve base 122 includes: a first cavity 12201 communicating with the liquid reaction chamber 1201, a second cavity 12202 communicating with the detection chamber 1202, a second partition 1222 for separating the first cavity 12201 and the second cavity 12202, a connecting hole 1223 formed on the second partition 1222, a guide member connected to the connecting hole 1223 and forming a flow channel, and a valve member 1221 for slidingly inserting into the flow channel;

[0077] The valve component 1221 is fitted with a first sealing element 1224 on one end of its valve core. When the valve core slides to the closed position, the first sealing element 1224 will close the communication hole 1223, thereby cutting off the communication between the first cavity 12201 and the second cavity 12202. When the valve core is in the open position, the communication hole 1223 will be opened.

[0078] The valve component 1221 is also fitted with a second sealing element 1225 on the other end of the valve core, so that when the valve core slides in the flow channel, the fluid in the first cavity 12201 is always isolated from the outside.

[0079] When the valve component 1221 slides to the closed position, it engages with the valve base 122, and the direction of engagement is perpendicular to the insertion direction of the rod.

[0080] When valve 1221 is in the closed position, the liquid is always sealed in the liquid reaction chamber by the cooperation of the two seals on valve 1221.

[0081] When the sliding valve 1221 is slid to the open position, liquid can flow from the liquid chamber into the detection chamber, thereby contacting the test strip 6 installed in the detection chamber. Due to the pressure balance principle, the height of the liquid to be tested flowing into the detection chamber will not exceed the MAX line of the test strip 6. The liquid to be tested migrates upward along the test strip 6 through capillary action, passing sequentially through the conjugate pad, T line, and C line, and is thus detected. The front sealing ring is pushed out, and at this time, liquid can flow from the liquid chamber into the detection chamber, thereby contacting the sample pad of the test strip 6 installed in the detection chamber. Utilizing the pressure balance principle, the height of the liquid to be tested flowing into the detection chamber will not exceed the MAX line of the test strip 6. As the liquid to be tested migrates upward along the test strip 6 through capillary action, passing sequentially through the conjugate pad, T line, and C line, it is thus detected.

[0082] Furthermore, preferably, the valve switch slides in a unidirectional direction toward the first cavity 12201, so that the valve switch can only slide inward to prevent accidental operation from causing liquid to leak to the outside.

[0083] Furthermore, as a preferred embodiment, the opening at the upper end of the aforementioned accommodating channel is funnel-shaped to prevent liquid backflow.

[0084] In addition, the aforementioned detection chamber is equipped with slots for inserting test strips and drying sheets, respectively.

[0085] Example 2

[0086] The second embodiment of this utility model provides a sample collection rod 2 for a diagnostic device. This embodiment is a further improvement on the first embodiment described above. Figure 9 As shown, the improvement is that the diameter of the columnar portion 22' of the sample collection rod 2 gradually decreases from the end used to connect the head 21 toward the tail 23.

[0087] This structure allows the larger end of the columnar part 22 to be manually fitted onto it. When the sealing ring falls off under the action of the limiter 25, the end of the sealing ring can be squeezed better after the head 21 of the sample sampling rod is reinserted into the receiving channel, causing the sealing ring to tilt or fall directly from the receiving channel into the liquid reaction chamber 1201.

[0088] Example 3

[0089] This application also provides a diagnostic device, including: the sample collection rod 2 in the above embodiment one or embodiment two.

[0090] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. The utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered by the claims of this utility model.

Claims

1. A sample collection rod for a diagnostic device, characterized in that, include: Header used for sampling; A columnar portion connected at one end to the head and at the other end to the tail; A limiting portion disposed in the circumferential direction of the columnar portion; A limiter and a flexible sealing ring are sequentially fitted onto the columnar portion; The limiter is used to circumferentially lock into the receiving channel in the diagnostic device after the head reaches the acquisition station in the diagnostic device to be inserted, under the squeezing action of the limiting part, so that when the head is removed, the flexible sealing ring is disengaged under the limiting action of the limiter and remains in the receiving channel.

2. The sample collection rod of the diagnostic device according to claim 1, characterized in that, The clamping connection is formed by any one or a combination of extrusion deformation, friction contact, or snap-fit ​​structure.

3. The sample collection rod of the diagnostic device according to claim 1, characterized in that, The diameter of the columnar portion gradually decreases from the end used to connect the head toward the tail; And / or, the diameter of the end of the columnar portion used to connect to the head is larger than the diameter of the through hole of the flexible sealing ring.

4. The sample collection rod of the diagnostic device according to claim 1, characterized in that, The diameter of the end of the columnar portion used to connect to the head is larger than the diameter of the head; And / or, the head is provided with a threaded groove in the circumferential direction.

5. The sample collection rod of the diagnostic device according to claim 1, characterized in that, When the flexible sealing ring detaches from the columnar portion and the head passes through the receiving channel again, touching the flexible sealing ring will cause the flexible sealing ring to tilt or fall into the liquid reaction chamber connected to the receiving channel in the diagnostic device. This allows the liquid reagent to flow from the liquid reaction chamber into the detection chamber when the liquid reaction chamber in the diagnostic device is connected to the detection chamber.

6. The sample collection rod of the diagnostic device according to claim 1, characterized in that, The limiter is a plastic or elastic part with a hollow cavity, wherein the hollow cavity is used to pass through the columnar part; The diameter of the hollow cavity is greater than the maximum diameter of the columnar portion and the inner diameter of the through hole of the sealing ring; And / or, the flexible sealing ring is a rubber sealing ring or a silicone sealing ring; And / or, the hardness of the flexible sealing ring is 60-65; And / or, the type of the flexible sealing ring is a switch sealing ring.

7. The sample collection rod of the diagnostic device according to claim 1, characterized in that, The diagnostic device is an integrated excrement detection device, comprising: a liquid reaction chamber with liquid reagents, a detection chamber with test strips, and a flow channel for connecting the liquid reaction chamber and the detection chamber and whose on / off state can be controlled.

8. A diagnostic device, characterized in that, include: The sample collection rod of the diagnostic device according to any one of claims 1 to 7.

9. The diagnostic device according to claim 8, characterized in that, The diagnostic device includes: a housing and a cover detachably connected to the housing; wherein the housing is provided with the receiving channel and a liquid reaction chamber.

10. The diagnostic device according to claim 9, characterized in that, The housing includes: a main housing with a liquid reaction chamber and a detection chamber, and a valve base detachably connected to the main housing, wherein the detection chamber is used to insert a test strip and / or a drying sheet; the liquid reaction chamber and the detection chamber are separated from each other by a first partition; the valve base is provided with a valve switch for controlling the on / off connection between the liquid reaction chamber and the detection chamber; And / or, the cover is provided with a protruding limiting structure for achieving the detachable connection with the housing; And / or, the cover is connected to the tail by welding.

11. The diagnostic device according to claim 10, characterized in that, The test strip includes: an insertion part with a hollow area, and a covering part perpendicularly connected to the insertion part and used to cover the detection cavity; an observation window is provided on the side of the housing adjacent to the test strip; And / or, the cover body is provided with a groove for inserting the tail, wherein the groove is formed by a welded cylindrical member or an integrally formed concave structure on the cover body; And / or, the main housing is a transparent housing.

12. The sample collection rod according to claim 9, characterized in that, The valve base includes: a first cavity communicating with the liquid reaction chamber, a second cavity communicating with the detection chamber, a second partition for separating the first cavity and the second cavity, a connecting hole opened on the second partition, a guide component connected to the connecting hole and forming a flow channel, and a valve component for slidingly inserting into the flow channel; The valve component has a first sealing element fitted on one end of its valve core. When the valve core slides to the closed position, the first sealing element closes the communication hole, thereby cutting off the communication between the first cavity and the second cavity. When the valve core is in the open position, the communication hole is opened. The valve component is further fitted with a second sealing element on the other end of the valve core, so that when the valve core slides in the flow channel, it always isolates the fluid in the first cavity from the outside. When the valve component slides to the closed position, it engages with the valve base, and the direction of engagement is perpendicular to the insertion direction of the rod. And / or, the sliding direction of the valve switch is unidirectional and faces the first cavity side; And / or, the opening at the upper end of the receiving channel is funnel-shaped.

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