An anti-reflux drainage bag with a series partition and a drainage and sampling method

Abstract

The present application provides an anti-reflux drainage bag with a series of compartments, as well as a drainage and sampling method, which relates to the technical field of medical devices and includes a drainage tube and a drainage bag; the drainage tube penetrates through the drainage bag, and a stop valve is provided in the section of the drainage tube located within the drainage bag; the drainage bag includes a plurality of compartments, and the stop valve can connect the drainage tube or connect the compartments or connect the drainage tube and the compartments simultaneously. By adjusting the stop valve, the drainage tube can be connected to a specific compartment without connecting to other compartments, overcoming the problem of mutual contamination between compartments in the existing drainage bag with a series of compartments when collecting drainage fluid; and the drainage fluid in a specific compartment can be discharged into the drainage tube by adjusting the stop valve, solving the defect that the conventional drainage bag with a series of compartments cannot freely collect the drainage fluid in a certain compartment; an anti-reflux device is also provided, which cooperates with the blocking effect of the stop valve between compartments to achieve anti-reflux of the drainage bag and each compartment.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an anti-reflux drainage bag with a series partition and a drainage and sampling method. Background Art

[0002] The statements herein only provide background information related to the present application and do not necessarily constitute prior art.

[0003] A drainage bag is a commonly used instrument for external drainage operations. The drainage bag is provided with a drainage tube communicating with the inside of the drainage bag; during use, the drainage tube is implanted into the patient's body to introduce the body fluid in the patient's body into the drainage bag through the drainage tube. The body fluid in the patient's body is called drainage fluid. Medical staff judge the patient's physical condition according to the nature of the drainage fluid in the drainage bag and can extract a sample of the drainage fluid in the drainage bag for testing. Common drainage bags only have a single bag body. Medical staff need to pour out the drainage fluid in the bag every day, which not only generates a large amount of work for pouring out the drainage fluid, but also is not conducive to the comparative analysis of the patient's daily drainage fluid;

[0004] Currently, some drainage bags with multiple partitions have emerged. By setting multiple partitions in series or in parallel, the drainage fluid can enter different partitions for independent storage, realizing the need not to pour out the drainage fluid every day; for the drainage bags with partitions in parallel, such as the Chinese utility model CN201621368689.4 - a multifunctional drainage bag, which is provided with a plurality of non - communicating storage cavities, and the injection of drainage fluid into different storage cavities can be controlled through the cooperation of the upper buffer cavity and the upper plug; due to the defects of large volume and many components of the drainage bags with partitions in parallel, there are difficulties in manufacturing, and problems such as tipping are likely to occur after injecting drainage fluid into one - side partition, so they have not been widely used;

[0005] The drainage bags with partitions in series have stronger utilization value due to advantages such as small volume and simple structure. For example, the Chinese utility model CN202021397285.4 - a precision quantitative drainage bag, which uses a sealing strip to divide multiple partitions in the same drainage bag, enabling the daily collected drainage fluid to be stored in different partitions and eliminating the need to pour out the drainage fluid every day; for such drainage bags with series partitions, the upper partition cannot maintain a sterile state because the drainage fluid must pass through the upper partition before entering the lower partition, interfering with the medical staff's judgment of the nature of the drainage fluid in the partition; moreover, medical staff can only release the drainage fluid in the order from bottom to top and cannot freely collect the drainage fluid in a certain partition, which is not conducive to the regular sampling of the drainage fluid; the conventional drainage bags with series partitions adopt quick - sealing measures such as sealing strips, which are difficult to ensure complete sealing between the partitions, and there is a risk of back - flow of the drainage fluid between the partitions. Summary of the Invention

[0006] The purpose of this application is to address the deficiencies in the prior art and propose an anti-reflux drainage bag with series compartments, as well as a drainage and sampling method. This can introduce the drainage fluid into the lower compartment without passing through the upper compartment, prevent cross-contamination of the drainage fluid, freely collect the drainage fluid in any compartment, and prevent the reverse flow of the drainage fluid between compartments.

[0007] The first objective of this application is to provide an anti-reflux drainage bag with series compartments. One or more embodiments of this application provide the following technical solutions:

[0008] An anti-reflux drainage bag with series compartments includes a drainage tube and a drainage bag. The drainage tube is a hollow pipe fitting that penetrates the drainage bag, and a stop valve is provided within the interval of the drainage bag where the drainage tube is located. The drainage bag includes multiple compartments that are arranged in parallel along the length direction of the drainage bag. A partition is provided at the bottom of the compartment, and the partition forms a space for installing the stop valve. The stop valve and the partition jointly form a blocking effect on the drainage fluid.

[0009] Further, the stop valve includes a valve body and a valve core. The valve core is disposed within the valve body and is rotatably connected to the valve body. The valve body includes a main flow channel, which consists of two sections, namely the upper main flow channel and the lower main flow channel. The upper main flow channel and the lower main flow channel are respectively in one-to-one correspondence and communication with the drainage tubes at the upper and lower parts of the valve body. The valve core is provided with a first passage that can connect the upper main flow channel and the lower main flow channel.

[0010] Further, the valve body further includes a branch channel that is arranged parallel to the main flow channel. The branch channel communicates with the adjacent compartment at the upper part of the valve body. The valve core is provided with a second passage that is perpendicular to the first passage. One end of the second passage communicates with the outside of the valve core, and the other end communicates with the first passage. The second passage can connect the branch channel and the main flow channel.

[0011] Further, the drainage tube includes an anti-reflux device, which is provided at the top of the drainage bag.

[0012] Further, the anti-reflux device is an S-shaped rigid sleeve that is sleeved outside the drainage tube.

[0013] Further, the drainage tube includes a liquid outlet, which is provided at the bottom of the drainage bag. The liquid outlet includes a liquid outlet switch.

[0014] Further, the drainage bag is a transparent drainage bag, and a scale is provided on one side of the drainage bag.

[0015] Further, independent scales are provided for each of the multiple compartments.

[0016] The second object of the present application is to provide a drainage method for the anti-reflux drainage bag with series compartments, including the following content:

[0017] 1) Insert the drainage tube into the affected area of the patient; adjust the stop valve at the bottom of the bottommost compartment of the drainage bag until the second passage of the valve core communicates with the branch channel and the first passage communicates with the upper main channel; adjust the stop valves at the bottoms of other compartments until the first passage of the valve core communicates with the two main channels and the second passage does not communicate with the branch channel, so that the bottommost compartment collects the drainage fluid;

[0018] 2) After the bottommost compartment has collected the daily drainage fluid, adjust the stop valve at the top of the bottommost compartment until the second passage of the valve core communicates with the upper main channel and the first passage communicates with the branch channel to complete the sealing of the bottommost compartment;

[0019] 3) Repeat steps 1) and 2) to collect the drainage fluid in the compartments of the drainage bag from bottom to top.

[0020] 4) After all compartments have completed the collection of the drainage fluid, adjust all stop valves until the first passage of the valve core communicates with the two main channels and the second passage communicates with the branch channel; open the liquid outlet switch to discharge the drainage fluid in the drainage bag from the liquid outlet.

[0021] The third object of the present application is to provide a sampling method for the anti-reflux drainage bag with series compartments, including the following content:

[0022] 1) Adjust the stop valves at the bottoms of all compartments below the compartment to be sampled until the first passage communicates with the two main channels and the second passage does not communicate with the branch channel;

[0023] 2) Adjust the stop valve at the bottom of the compartment to be sampled until the first passage communicates with the branch channel and the second passage communicates with the lower main channel, so that the drainage fluid in the compartment to be sampled flows down through the drainage tube;

[0024] 3) Open the liquid outlet switch to discharge the drainage fluid in the compartment to be sampled from the liquid outlet.

[0025] Advantages of the Invention

[0026] 1. The present application is provided with a stop valve. The valve body of the stop valve includes a main channel and a branch channel, and the valve core has a first passage and a second passage; by adjusting the cooperation between the valve core and the valve body, it is possible to introduce the drainage fluid from the drainage tube into the bottommost compartment without contaminating other compartments, overcoming the problem of mutual contamination between compartments in the existing drainage bag with series compartments during the collection of drainage fluid, enabling medical staff to conduct comparative analysis on the daily drainage fluid of patients.

[0027] 2. For sampling of drainage fluid in specific compartments, the present application only needs to adjust the stop valves of different compartments to form a channel directly connected to the liquid outlet at the bottom of the specific compartment, so that the drainage fluid in the specific compartment can enter the drainage tube and be discharged, which solves the defect that the conventional drainage bag with serial compartments cannot freely collect the drainage fluid in a certain compartment, and facilitates the medical staff to sample the drainage fluid.

[0028] 3. The present application can seal the drainage fluid in the compartment by adjusting the stop valve so that the valve core is not connected to the branch channel, and the sealing does not affect the collection of drainage fluid in other compartments, thereby achieving anti-backflow between compartments; and the present application is provided with an anti-backflow device on the top of the drainage bag, and the drainage tube is twisted by an S-shaped hard sleeve to prevent the liquid in the drainage bag from flowing back into the drainage tube, thereby achieving anti-backflow between the drainage bag and the drainage tube. That is, the present application solves the backflow problem between serial compartments on the premise of achieving rapid closure of the compartments, and further avoids mutual contamination of the drainage fluid in each compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0030] Figure 1 This is a schematic diagram of the overall structure of the anti-reflux drainage bag with series partitions in Example 1 of the present application;

[0031] Figure 2 This is a schematic diagram of the position of the stop valve when the current compartment of the anti-reflux drainage bag with serial compartments in Example 1 of the present application is closed;

[0032] Figure 3 This is a schematic diagram of the position of the stop valve when the drainage fluid of the anti-reflux drainage bag with series partitions in Example 1 of the present application enters the partition;

[0033] Figure 4 This is a schematic diagram of the position of the stop valve of the anti-reflux drainage bag with series partitions in Example 1 of the present application when a large amount of drainage fluid is drawn out;

[0034] Figure 5 This is a schematic diagram of the position of the stop valve when taking out the drainage fluid in a specific compartment of the anti-reflux drainage bag with serial compartments in Example 1 of the present application;

[0035] Among them, 1. drainage tube; 2. drainage bag; 3. stop valve; 4. anti-backflow device; 5. liquid outlet; 6. scale; 7. layer number label; 8. information label; 21. partition; 31. valve body; 32. valve core; 51. liquid outlet switch; 311. upper main channel; 312. lower main channel; 313. tributary channel; 321. first passage; 322. second passage. DETAILED DESCRIPTION

[0036] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the technical solution of the present application will be described in detail below in conjunction with specific embodiments.

[0039] As introduced in the background art, there are currently problems of mutual contamination between compartments during the collection of drainage fluid in drainage bags with series-connected compartments, and it is impossible to freely collect the drainage fluid in a certain compartment. There is also a risk of backflow of the drainage fluid between compartments. The present application proposes an anti-backflow drainage bag with series-connected compartments and a drainage and sampling method.

[0040] Embodiment 1

[0041] A typical embodiment of the present application, as Figures 1 - 5 shown, provides an anti-backflow drainage bag with series-connected compartments.

[0042] Referring to Figures 1 - 5 , this embodiment proposes an anti-backflow drainage bag with series-connected compartments, including a drainage tube 1 and a drainage bag 2; the drainage tube is a hollow pipe fitting that penetrates the drainage bag, and a stop valve 3 is provided in the interval of the drainage bag where the drainage tube is located; the drainage bag includes a plurality of compartments, and the plurality of compartments are arranged in parallel along the length direction of the drainage bag; a partition 21 is provided at the bottom of the compartment, and the partition is provided with a space for installing a stop valve, and the stop valve and the partition jointly form a blocking effect on the drainage fluid;

[0043] Specifically, the stop valve includes a valve body 31 and a valve core 32; the valve core is a cylinder provided in the valve body, and the valve body is provided with a space for accommodating the valve core; the valve core is made of rubber, and after the rubber valve core is deformed, it can be clamped inside the valve body and rotatably connected to the valve body, and the rubber valve core can block the gap between the valve core and the valve body to prevent the drainage fluid from leaking out;

[0044] The valve core protrudes from one side of the valve body through the drainage bag, enabling the user to rotate the valve core outside the drainage bag; in this embodiment, a groove is provided on the protruding part of the valve core, and the groove is in a straight shape. By providing the groove, it is convenient for the user to rotate the valve core to timely control the opening and closing of each compartment. Of course, to avoid accidentally touching the groove and causing accidental communication between compartments, the groove can also be in a cross shape.

[0045] The valve body includes a main flow channel, which consists of two sections, namely the upper main flow channel 311 and the lower main flow channel 312. The upper main flow channel and the lower main flow channel are respectively and correspondingly connected to the drainage pipes at the upper and lower parts of the valve body; the valve core is provided with a first passage 321, and the first passage can connect the upper main flow channel and the lower main flow channel; specifically, the first passage is a through hole opened in the valve core, and the opening direction of the first passage is perpendicular to the central axis of the cylindrical valve core and passes through the geometric center of the valve core.

[0046] It can be understood that in this embodiment, the downward direction refers to the direction in which the drainage fluid flows out of the drainage bag; the upward direction refers to the direction away from the drainage fluid flowing out of the drainage bag.

[0047] To introduce the drainage fluid in the drainage pipe into the compartment, the valve body further includes a branch channel 313; the branch channel is arranged parallel to the main flow channel, and the branch channel is connected to the adjacent compartment at the upper part of the valve body, and the adjacent compartment is the first compartment at the upper part of the valve body; the valve core is provided with a second passage 322, the second passage is arranged perpendicular to the first passage, and the plane where the first passage and the second passage are located is parallel to the circular surface of the valve core; one end of the second passage is connected to the outside of the valve core, and the other end is connected to the first passage, and the second passage can connect the branch channel and the main flow channel.

[0048] In this embodiment, the valve body is provided with a first passage and a second passage that are connected, that is, there are three openings connecting the valve body, and the three openings correspond to the upper main flow channel, the lower main flow channel and the branch channel of the valve body; refer to Figure 2 , when the valve core rotates to the position where the second passage faces away from the branch channel, the main flow channel is connected and the branch channel is not connected, that is, at this time, there is no liquid communication between the compartment at the upper part of the valve body and the drainage pipe, realizing the closure of the current compartment without affecting the introduction of the drainage fluid into other compartments;

[0049] Refer to Figure 3 , when the valve core rotates to the position where the first passage is connected to the branch channel and the second passage is connected to the upper main flow channel, the drainage fluid flowing in from the main flow channel enters the compartment at the upper part of the valve body through the valve core after passing through the valve core, that is, it realizes the control of the drainage fluid entering the compartment, and can avoid the backflow of the drainage fluid between compartments by blocking the lower main flow channel;

[0050] Refer to Figure 4, when the valve core rotates to make the first passage communicate with the upper main stream channel and the lower main stream channel, and the second passage communicate with the branch channel, the partition communicates with the drainage tube; at this time, the drainage fluid in the partition can flow out through the drainage tube, realizing the drainage of the drainage fluid, and it can also realize that when the drainage fluid in the lower partition is full, the drainage fluid automatically flows into the upper partition, that is, the isolation effect of the partition on the drainage fluid no longer takes effect. At this time, the drainage bag can be used as a conventional drainage bag to make the best use of the volume of the drainage bag content, which is suitable for the situation of draining a large amount of drainage fluid;

[0051] Reference Figure 5 , when the valve core rotates to make the second passage communicate with the lower main stream channel and the first passage communicate with the branch channel, the partition communicates with the drainage tube and the drainage tube no longer passes through new drainage fluid, that is, the drainage fluid in a specific partition is taken out.

[0052] To prevent the drainage fluid in the drainage bag from flowing back into the drainage tube, the drainage tube includes an anti-backflow device 4; the anti-backflow device is arranged at the top of the drainage bag; specifically, the anti-backflow device is an S-shaped rigid sleeve, which is sleeved outside the drainage tube; by setting the anti-backflow device, the drainage tube is twisted, and there is a height difference on both sides of the twisted drainage tube, so that the drainage fluid overflowing from the drainage bag is not easy to flow back into the drainage tube, realizing the anti-backflow between the drainage bag and the drainage tube. Combining with the blocking effect of the valve core on the backflow between the partitions, this embodiment solves the problem of backflow between the series-connected partitions on the premise of quickly closing the partition, effectively avoiding the mutual contamination of the drainage fluid in each partition.

[0053] To control the drainage of the drainage tube, the drainage tube includes a liquid outlet 5; the liquid outlet is a rigid pipe section arranged at the bottom of the drainage bag, and the liquid outlet includes a liquid outlet switch 51, and the liquid outlet switch can control the flow rate of the drainage fluid discharged from the drainage tube.

[0054] Furthermore, in this embodiment, a transparent drainage bag is adopted, and an independent scale 6 is provided for each partition of the drainage bag, so that medical staff can observe the nature of the patient's daily drainage fluid through the drainage bag and count the amount of the patient's daily drainage fluid, which is convenient for analyzing the patient's current condition.

[0055] Each partition is also provided with a layer number label 7 and an information label 8; the layer number label is marked with a number representing the position of the current partition, and the information label is used to fill in the patient information and the drainage information.

[0056] Embodiment 2

[0057] This embodiment provides a drainage method for the anti-backflow drainage bag with series-connected partitions described in Embodiment 1, including the following content:

[0058] 1) Insert the drainage tube into the affected area of the patient; adjust the stop valve located at the bottom of the bottommost compartment of the drainage bag until the second passage of the valve core communicates with the branch channel and the first passage communicates with the upper main channel; adjust the stop valves at the bottoms of other compartments until the first passage of the valve core communicates with the two main channels and the second passage does not communicate with the branch channel, so that the bottommost compartment collects the drainage fluid.

[0059] 2) After the bottommost compartment has collected the daily drainage fluid, adjust the stop valve at the top of the bottommost compartment until the second passage of the valve core communicates with the upper main channel and the first passage communicates with the branch channel to complete the sealing of the bottommost compartment.

[0060] 3) Repeat steps 1) and 2) to complete the collection of the drainage fluid in the compartments of the drainage bag from bottom to top.

[0061] 4) After all compartments have completed the collection of the drainage fluid, adjust all stop valves until the first passage of the valve core communicates with the two main channels and the second passage communicates with the branch channel; open the liquid outlet switch to discharge the drainage fluid in the drainage bag from the liquid outlet.

[0062] In this embodiment, through the cooperation of the main channel and the branch channel of the valve body with the first passage and the second passage of the valve core, when it is necessary to introduce the drainage fluid into the bottommost compartment, only need to adjust the corresponding stop valves of other compartments to make the main channels communicate and the branch channels closed, and adjust the stop valve of the bottommost compartment to make the main channel communicate with the branch channel, then it can be realized that the drainage fluid is introduced from the drainage tube into the bottommost compartment without contaminating other compartments, overcoming the problem of mutual contamination between compartments in the existing drainage bag with series compartments, enabling medical staff to conduct comparative analysis on the daily drainage fluid of patients.

[0063] Embodiment 3

[0064] This embodiment provides a sampling method for the anti-reflux drainage bag with series compartments described in Embodiment 1, including the following:

[0065] 1) Adjust the stop valves at the bottoms of all compartments below the compartment to be sampled until the first passage communicates with the two main channels and the second passage does not communicate with the branch channel.

[0066] 2) Adjust the stop valve at the bottom of the compartment to be sampled until the first passage communicates with the branch channel and the second passage communicates with the lower main channel, so that the drainage fluid in the compartment to be sampled flows down through the drainage tube.

[0067] 3) Open the liquid outlet switch to discharge the drainage fluid in the compartment to be sampled from the liquid outlet.

[0068] Considering that there may be a few days between two adjacent samplings for drainage fluid sampling and testing, and the sampling interval may not be at the bottom of the drainage bag, that is, there is a problem of how to sample the drainage fluid in a specific interval; in this embodiment, only by adjusting the stop valves at the bottoms of all intervals below the interval to be sampled so that the first passage communicates with the main flow channel and the second passage does not communicate with the branch channel, a channel directly communicating with the liquid outlet can be formed below the specific interval; at this time, adjusting the drainage valve at the bottom of the specific interval to make the branch channel communicate with the main flow channel can make the drainage fluid in the specific interval enter the drainage tube and be discharged, solving the defect that the conventional drainage bag with series intervals cannot freely collect the drainage fluid in a certain interval and facilitating medical staff to sample the drainage fluid.

[0069] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An anti-reflux drainage bag with series compartments, Characterized in that, It includes a drainage tube and a drainage bag; the drainage tube is a hollow pipe fitting that penetrates the drainage bag, and a stop valve is provided in the section of the drainage tube within the drainage bag; the drainage bag includes multiple compartments, and the multiple compartments are arranged in parallel along the length direction of the drainage bag; a partition is provided at the bottom of the compartment, and a space for installing the stop valve is opened in the partition, and the stop valve and the partition jointly form a blocking effect on the drainage fluid; The stop valve includes a valve body and a valve core, and the valve core is arranged in the valve body and rotatably connected to the valve body; the valve body includes a main flow channel, and the main flow channel includes two sections, namely an upper main flow channel and a lower main flow channel, and the upper main flow channel, the lower main flow channel are respectively in one-to-one correspondence and communication with the drainage tubes at the upper and lower parts of the valve body; the valve core is provided with a first passage, and the first passage can communicate the upper main flow channel and the lower main flow channel; The valve body further includes a branch channel, and the branch channel is arranged parallel to the main flow channel, and the branch channel communicates with the adjacent compartment at the upper part of the valve body; the valve core is provided with a second passage, and the second passage is arranged perpendicular to the first passage, one end of the second passage communicates with the outside of the valve core, and the other end communicates with the first passage, and the second passage can communicate the branch channel and the main flow channel; When the valve core rotates to the position where the second passage deviates from the branch channel, the main flow channel is communicated and the branch channel is not communicated; when the valve core rotates to the position where the first passage communicates with the branch channel and the second passage communicates with the upper main flow channel, the drainage fluid flowing in from the main flow channel passes through the valve core and then is sent into the compartment at the upper part of the valve body through the branch channel; when the valve core rotates to the position where the first passage communicates the upper main flow channel and the lower main flow channel, and the second passage communicates the branch channel, the compartment is communicated with the drainage tube; when the valve core rotates to the position where the second passage communicates the lower main flow channel and the first passage communicates the branch channel, the compartment is communicated with the drainage tube and no new drainage fluid passes through the drainage tube.

2. The anti-reflux drainage bag with series compartments according to claim 1, Characterized in that, The drainage tube includes an anti-reflux device; the anti-reflux device is arranged at the top of the drainage bag.

3. The anti-reflux drainage bag with series compartments according to claim 2, Characterized in that, The anti-reflux device is an S-shaped rigid sleeve, and the anti-reflux device is sleeved outside the drainage tube.

4. The anti-reflux drainage bag with series compartments according to claim 1, Characterized in that, The drainage tube includes a liquid outlet; the liquid outlet is arranged at the bottom of the drainage bag, and the liquid outlet includes a liquid outlet switch.

5. The anti-reflux drainage bag with series compartments according to claim 1, Characterized in that, The drainage bag is a transparent drainage bag, and a scale is provided on one side of the drainage bag.

6. The anti-reflux drainage bag with series compartments according to claim 5, Characterized in that, Multiple compartments are respectively provided with independent scales.

7. A sampling method, using the anti-reflux drainage bag with series compartments according to any one of claims 1-6, Characterized in that, It includes the following contents: 1) Adjust the stop valves at the bottoms of all the compartments below the compartment to be sampled, so that the first passage communicates the two sections of the main flow channel and the second passage does not communicate with the branch channel; 2) Adjust the stop valve at the bottom of the sampling area to be separated so that the first passage communicates with the branch channel and the second passage communicates with the lower main channel, allowing the drainage fluid in the sampling area to flow down through the drainage tube; 3) Open the liquid outlet switch to discharge the drainage fluid in the sampling area through the liquid outlet.

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