Drainage device

Abstract

The utility model discloses a drainage device, relates to the technical field of drainage, and aims to solve the technical problems that people need to pay attention to the volume condition of drainage liquid in a negative pressure bottle, and the drainage device is inconvenient to use. The drainage device comprises a negative pressure bottle drainage bag connected through a communicating device, the communicating device comprises a first pipe communicated with a negative pressure bottle, a base and a switch plate are arranged in the first pipe and connected through a telescopic device, the switch plate is in sliding connection with the first pipe, and the first pipe is connected with a second pipe communicated with the drainage bag. A plurality of through holes communicated with the second pipe are formed in the side wall of the first pipe, and the first pipe is communicated with the second pipe when the switch plate slides to the through holes. A communicating device and the like are adopted, drainage liquid is drained into the drainage bag by opening the switch plate through the gravity of the drainage liquid, after the drainage liquid in the negative pressure bottle is drained into the drainage bag, the switch plate can automatically return to the original position to conduct drainage on the next drainage bottle, the work content of medical workers is simplified, the use feeling is improved, and operation is easy, convenient and fast.

Description

Technical Field

[0001] This utility model belongs to the field of drainage technology, specifically relating to a drainage device. Background Technology

[0002] Drainage is a common surgical treatment method in clinical practice. It primarily involves using surgical techniques to remove pus, blood, and other fluids accumulated between body tissues, outside body cavities, and within internal visceral cavities. Clinically, the purpose of drainage is to prevent the accumulation of useless fluids in tissues or body cavities, to remove bacterial culture medium, to prevent the occurrence and spread of infection within the patient, and to relieve local pressure, preventing fluid accumulation from compressing or damaging adjacent organs. Furthermore, drainage can prevent premature closure of the skin, promoting the contraction of abscesses or exudates, the growth of granulation tissue from the base, and good wound healing.

[0003] Currently, postoperative drainage typically employs a negative pressure drainage system consisting of a drainage tube, a negative pressure bottle, and a storage drainage bag connected in sequence. During use, drainage is directly based on the pressure difference between the patient's surgical site and the negative pressure bottle, drawing blood, pus, and other drainage fluids into the bottle. When the bottle is nearly full, the valve between the bottle and the drainage bag is opened to store the drainage fluid in the bag. If there is a large amount of drainage fluid in the bag, medical staff will transfer it to a specialized device for further processing before discharging.

[0004] However, due to the small size of the negative pressure bottle, it is necessary to open the valve between the negative pressure bottle and the drainage bag after a period of drainage to temporarily store the drainage fluid in the drainage bag. Therefore, medical staff, family members accompanying patients, or patients themselves need to pay attention to the volume of drainage fluid in the negative pressure bottle to prevent the bottle from becoming full and the drainage fluid from becoming stagnant, which would affect the drainage process and thus the patient's recovery. This is slightly inconvenient when using the bottle. Utility Model Content

[0005] This utility model discloses a drainage device, which aims to solve the technical problem in the prior art that requires someone to pay attention to the volume of drainage fluid in the negative pressure bottle, making it inconvenient to use.

[0006] To solve the aforementioned technical problems, the present invention adopts the following technical solution:

[0007] A drainage device includes a negative pressure bottle and a drainage bag, which are connected by a connecting device. The connecting device includes a first tube communicating with the negative pressure bottle, a base and a switch plate disposed inside the first tube, which are connected by a telescopic device. The switch plate is slidably connected to the first tube, and the first tube is connected to a second tube communicating with the drainage bag. The side wall of the first tube is provided with several through holes communicating with the second tube. When the switch plate slides to the through holes, the first tube communicates with the second tube.

[0008] With this technology, once the drainage fluid in the negative pressure bottle reaches a certain volume, the switch plate is pushed into the first tube by gravity until it slides to the leakage hole, connecting the first and second tubes. The drainage fluid then flows from the connecting channel into the second tube and into the drainage bag for temporary storage. The leakage hole also helps to break up large structures in the drainage fluid (such as blood vessels in plasma or pus clots in pus), ensuring proper drainage and improving safety. After the drainage fluid enters the drainage bag, the switch plate returns to its original position via the telescopic mechanism, continuing drainage. Throughout the process, no manual monitoring of the drainage fluid in the negative pressure bottle is required. The drainage fluid automatically opens the switch plate and flows into the drainage bag when it reaches the appropriate volume. After drainage, simply squeeze the negative pressure bottle to expel air, and drainage can continue for the patient. This system is very convenient to use.

[0009] The switch board and the base are respectively provided with a magnetic ferrule and a magnetic female component.

[0010] By adopting this technical solution, the design of the magnetic suction component and the magnetic suction mother component allows the switch plate to be positioned in conjunction with the first tube and the base during the process of the switch plate opening the through hole due to the gravity of a certain amount of drainage fluid in the negative pressure bottle. When the drainage fluid begins to flow into the drainage bag, the magnetic attraction force is greater than the elastic force of the telescopic spring, causing the switch plate and the base to gradually approach and be attracted under the influence of the gravity of the drainage fluid. This prevents the switch plate from returning to the bottom of the negative pressure bottle if not all the drainage fluid in the negative pressure bottle is drained into the drainage bag, thus ensuring that all the drainage fluid in the negative pressure bottle enters the drainage bag. Once all the drainage fluid in the negative pressure bottle has entered the drainage bag, the elastic force of the telescopic spring is greater than the magnetic force of the magnetic suction, and the switch plate returns to its original position under the action of the telescopic spring, starting to accumulate and begin draining the next negative pressure bottle. This improves the drainage effect and simplifies the operation.

[0011] The telescopic device is a spiral telescopic spring, and the base is provided with a receiving groove to accommodate the telescopic spring.

[0012] With this technical solution, when not subjected to the gravitational pressure of the drainage fluid, the elastic force of the spiral-shaped telescopic spring is greater than the attraction between the magnetic chuck and the magnetic nut. This allows the switch plate to automatically return to the bottle opening position at the bottom of the negative pressure bottle under the action of the telescopic spring, bearing the weight of a new bottle of drainage fluid. When the corresponding weight is reached, the switch plate slides in the first tube and contacts the base, thereby opening the channel between the first and second tubes to drain the drainage fluid from the negative pressure bottle. The spiral-shaped telescopic spring and the receiving groove on the base allow the telescopic spring to be accommodated in the receiving groove when the switch plate contacts the base, increasing the magnetic attraction between the magnetic chuck and the magnetic nut on the switch plate and the base. This increases the stability of the attraction between the magnetic chuck and the magnetic nut, thus increasing the stability of the device during use. It also reduces the size of the device, allowing it to cleverly achieve the corresponding switching function within a limited pipe structure, enhancing the practicality of the device.

[0013] The base is threadedly connected to the first pipe.

[0014] With this technical solution, the threaded connection between the base and the first tube can change the position of the base in the first tube, thereby changing the position of the channel exposed after the switch plate is connected to the base, thus changing the flow rate of the drainage fluid before it enters the drainage bag. There is no need to set up a separate flow control device, which reduces the cost of using this device while still being able to control the flow rate.

[0015] The second tube has a gap between its wall and the through hole.

[0016] With this technical solution, a gap is provided at the part where the second tube connects to the through hole. During the process of the drainage fluid entering the second tube, the pressure of the drainage fluid can be buffered, so that the drainage fluid enters the drainage bag at a more gentle speed, thus ensuring the stability of the drainage.

[0017] The switch plate is provided with a side plate that can fit against the bottom of the negative pressure bottle, and the side plate is a flexible structure.

[0018] By adopting this technical solution, the side plate can protect the switch plate, preventing the drainage fluid from contacting the side wall of the switch plate during its entry into the drainage bag. This prevents the drainage fluid from adhering to the side wall of the switch plate and affecting its sliding within the first tube, thus making the device more stable during use. Simultaneously, the side plate also blocks the gap between the switch plate and the first tube, preventing the drainage fluid from overflowing into the second tube before reaching the required capacity from the negative pressure bottle to the drainage bag, resulting in better drainage efficiency.

[0019] The negative pressure bottle has two openings, one of which is connected to a drainage tube, and the other opening is threaded to a protective cap.

[0020] With this technology, air can be expelled from the negative pressure bottle through the protective cap. This allows for faster drainage of fluid from the patient's body via pressure differential.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0022] (1) By using a first tube, a second tube, and a connecting device, the switch plate can be opened by the gravity of the drainage fluid itself, so that the drainage fluid can be drained into the drainage bag. After the drainage fluid in the negative pressure bottle is drained into the drainage bag, the switch plate can automatically return to its original position to drain the next drainage bottle. This simplifies the work of medical staff, is easy and convenient to operate, and can improve the user experience.

[0023] (2) Using magnetic chucks, magnetic chucks, and spiral-shaped telescopic springs, after the drainage fluid from one negative pressure bottle is automatically opened and drained into the drainage bag, the switch can be directly returned to its initial position to drain the drainage fluid from the second negative pressure bottle. The operation is simple.

[0024] (3) By using the base to connect with the first tube by thread, the position of the base in the first tube can be adjusted according to the patient's condition, thereby adjusting the flow rate of the drainage fluid into the drainage bag, making the device more practical. At the same time, there is no need to set up a flow adjustment device, which can reduce costs.

[0025] (4) The second tube is equipped with a gap at the position corresponding to the through hole. During the process of the drainage fluid entering the second tube, the pressure of the drainage fluid can be buffered, so that the drainage fluid enters the drainage bag at a more gentle speed, thus ensuring the stability of the drainage.

[0026] (5) A protective cap is used instead of the traditional plug-in opening, which can effectively protect the negative pressure bottle and prevent the drainage liquid in the negative pressure bottle from overflowing from the plug-in opening and causing pollution to bed sheets, etc. Excess gas can also be discharged through the outlet to ensure a more stable drainage by maintaining a pressure difference. Attached Figure Description

[0027] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0028] Figure 1 A schematic diagram of the overall structure of a drainage device according to this utility model;

[0029] Figure 2 for Figure 1 Enlarged diagram of A in the middle;

[0030] Figure 3 A top view of the structure housing the groove and the telescopic spring.

[0031] Figure Labels

[0032] 1-Negative pressure bottle, 101-Drainage tube, 102-Protective cover, 103-Connecting tube, 2-Connecting device, 201-Side plate, 202-Switch plate, 203-Magnetic clasp, 204-Telescopic spring, 205-Through hole, 206-Base, 207-Receiving groove, 208-Magnetic clasp, 209-First tube, 3-Second tube, 301-Spherical structure, 4-Drainage bag, 401-Grade, 402-Sealing cover. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments and accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and marked in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0034] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] The following is combined with Figures 1-3 This utility model will be described in detail.

[0036] A drainage device, such as Figures 1-3As shown, the device includes a negative pressure bottle 1 and a drainage bag 4, which are connected by a connecting device 2. The connecting device 2 includes a first tube 209 that communicates with the negative pressure bottle 1. A base 206 and a switch plate 202 are provided inside the first tube 209. The base 206 and the switch plate 202 are connected by a telescopic device. The switch plate 202 is slidably connected to the first tube 209. The first tube 209 is connected to a second tube 3 that communicates with the drainage bag 4. Several through holes 205 that communicate with the second tube 3 are provided on the side wall of the first tube 209. When the switch plate 202 slides to the through hole 205, the first tube 209 communicates with the second tube 3.

[0037] In this embodiment, the negative pressure bottle 1 and the drainage bag 4 are made of medical-grade silicone, which are existing technologies and will not be described in detail here.

[0038] In this embodiment, both the base 206 and the switch plate 202 are made of PVC material, which is readily available, easy to mold, and has low processing costs.

[0039] In this embodiment, the first tube 209 is threadedly connected to the negative pressure bottle 1. The outer wall of the first tube 209 is provided with a first external thread. The bottom opening of the negative pressure bottle 1 is provided with a connecting tube. The inside of the connecting tube is provided with an internal thread that mates with the first external thread.

[0040] In this embodiment, the switch plate 202 is initially located at the top of the connection between the first tube 209 and the negative pressure bottle 1, and seals the bottle opening at the bottom of the negative pressure bottle 1.

[0041] In this embodiment, the side wall of the switch plate 202 is provided with a leak-proof ring that cooperates with the first tube 209. The leak-proof ring can prevent the drainage fluid from overflowing directly from the gap between the switch plate 202 and the first tube 209.

[0042] In this embodiment, the first pipe 209 is threadedly connected to the second pipe 3. The outer wall of the first pipe 209 is provided with a second external thread, and the outer wall of the second pipe 3 is provided with a second internal thread that mates with the second external thread.

[0043] In this embodiment, the second tube 3 and the drainage bag 4 are detachably connected. Specifically, they can be connected by any of the following detachable connection methods: threaded connection, plug-in connection, etc. Other detachable connections not mentioned in this embodiment are all within the protection scope of this embodiment, as they all fall within the scope of existing technology and will not be described in detail here.

[0044] In this embodiment, the drainage bag 4 is provided with a readable scale 401, and the bottom of the drainage bag 4 is also provided with an outlet for discharging drainage fluid, and the outlet is connected to a sealing cap 402.

[0045] In this embodiment, several through holes 205 are evenly arranged around the side wall of the first tube 209, and the third internal thread is also provided at the through hole 205.

[0046] When the drainage fluid in the negative pressure bottle 1 reaches a certain volume, the switch plate 202 is squeezed into the first tube 209 under the gravity of the drainage fluid until it slides to the leakage through hole 205, connecting the first tube 209 and the second tube 3. The drainage fluid then enters the second tube 3 through the channel connecting the first tube 209 and the second tube 3, and flows into the drainage bag 4 for temporary storage. The through hole 205 also helps to break up large structures in the drainage fluid (such as blood vessels in plasma or pus clots in pus), ensuring normal drainage and improving drainage safety. After the drainage fluid enters the drainage bag 4, the switch plate 202 returns to its original position under the extension and retraction of the telescopic device, continuing to drain the drainage fluid. Throughout the process, no manual monitoring of the drainage fluid in negative pressure bottle 1 is required. The drainage fluid will automatically flow into drainage bag 4 when the corresponding volume is reached by opening switch 202. After all the drainage fluid in this bottle has been drained into drainage bag 4, the air in negative pressure bottle 1 is discharged, and drainage from a new bottle of negative pressure bottle 1 can continue. Compared to the previous method that required someone to frequently monitor the volume of drainage fluid in negative pressure bottle 1 and open the corresponding switch to transfer the drainage fluid into drainage bag when it was almost full, and then discharge the air from negative pressure bottle 1, this device only requires discharging the air from negative pressure bottle 1 after the drainage fluid in this bottle has been drained into drainage bag 4, making it more convenient to use.

[0047] In this embodiment, the switch plate 202 and the base 206 are respectively provided with a magnetic ferrule 203 and a magnetic ferrule 208.

[0048] In this embodiment, the magnetic ferrule 203 and the magnetic ferrule 208 are respectively attached to the two adjacent sides of the switch plate 202 and the base 206. This adhesion ensures that the two connected points are relatively flat, resulting in greater stability during use.

[0049] The design of the magnetic chuck 203 and magnetic chuck 208 allows the switch plate 202 to cooperate with the first tube 209 and the base 206 to limit its position during the process of the switch plate 202 opening the through hole 205 due to the gravity of a certain amount of drainage fluid in the negative pressure bottle 1. When the drainage fluid begins to flow into the drainage bag 4, the magnetic attraction force is greater than the elastic force of the extension spring 204, causing the switch plate 202 and the base 206 to gradually approach and be attracted under the influence of the gravity of the drainage fluid, thus allowing the switch plate 202 to remain within the negative pressure bottle 1. If the drainage fluid is not completely drained into the drainage bag 4, it will not return to the bottom of the negative pressure bottle 1. This ensures that all the drainage fluid in the negative pressure bottle 1 enters the drainage bag 4. Once all the drainage fluid in the negative pressure bottle 1 has entered the drainage bag 4, the elastic force of the telescopic spring 204 is greater than the magnetic force of the magnet. Under the action of the elastic force of the telescopic spring 204, the switch plate 202 returns to its original position and begins to accumulate drainage for the next negative pressure bottle 1. This improves the drainage effect and simplifies the operation.

[0050] In this embodiment, the telescopic device is a spiral telescopic spring 204, and the base 206 is provided with a receiving groove 207 for accommodating the telescopic spring 204.

[0051] In this embodiment, the two ends of the telescopic spring 204 are respectively attached to the magnetic accumulator 203 and the magnetic accumulator 208.

[0052] In this embodiment, the receiving groove 207 is disposed on the magnetic female component 208.

[0053] In this embodiment, the spiral telescopic spring 204 is existing technology and is the same as the telescopic spring in the remote control where the battery is installed. The diameter of the telescopic spring 204 gradually increases from one end to the other. When the telescopic spring 204 is squeezed into the receiving groove 207, it is pressed into a flat state.

[0054] When not subjected to the gravitational pressure of the drainage fluid, the elastic force of the spiral telescopic spring 204 is greater than the attraction between the magnetic chuck 203 and the magnetic chuck 208, allowing the switch plate 202 to automatically return to the bottle mouth position at the bottom of the negative pressure bottle 1 under the elastic force of the telescopic spring 204, bearing the weight of the drainage fluid in the new bottle. When the corresponding weight is reached, the switch plate 202 slides in the first tube 209 and contacts the base 206, thereby opening the channel between the first tube 209 and the second tube 3 to drain the drainage fluid in the negative pressure bottle 1.

[0055] The spiral-shaped telescopic spring 204 and the receiving groove 207 on the base 206 allow the telescopic spring 204 to be accommodated in the receiving groove 207 when the switch plate 202 and the base 206 are in contact, thus increasing the magnetic attraction force of the magnetic attractor 203 and magnetic attractor 208 on the switch plate 202 and the base 206. This increases the stability of the attraction between the magnetic attractor 203 and the magnetic attractor 208, thereby increasing the stability of the device during use. It also reduces the size of the device, allowing it to cleverly achieve the corresponding switching function within a limited pipe structure, enhancing the practicality of the device.

[0056] In this embodiment, a gap is provided between the wall of the second tube 3 and the corresponding position of the through hole 205.

[0057] In this embodiment, as Figure 2 As shown, the gap is a spherical structure 301.

[0058] The part where the second tube 3 connects to the through hole 205 has a gap. During the process of the drainage fluid entering the second tube 3, the gap can buffer the pressure of the drainage fluid, so that the drainage fluid enters the drainage bag 4 at a more gentle speed, thus ensuring the stability of the drainage.

[0059] In this embodiment, the switch plate 202 is provided with a side plate 201 that can fit against the bottom of the negative pressure bottle 1, and the side plate 201 is a flexible structure.

[0060] In this embodiment, the side plate 201 is made of flexible silicone and is adhered to the top of the switch plate 202.

[0061] The side plate 201 protects the switch plate 202, preventing the drainage fluid from contacting the side wall of the switch plate 202 during its entry into the drainage bag 4. This prevents the drainage fluid from adhering to the side wall of the switch plate 202, which could affect its sliding within the first tube 209, thus making the device more stable during use. Simultaneously, the side plate 201 also blocks the gap between the switch plate 202 and the first tube 209, preventing the drainage fluid from overflowing into the second tube 3 before reaching the required capacity from the negative pressure bottle 1 to the drainage bag 4, resulting in better drainage efficiency.

[0062] In this embodiment, the negative pressure bottle 1 is provided with two openings, one of which is connected to a drainage tube 101, and the other opening is threadedly connected to a protective cap 102.

[0063] One of the openings of the negative pressure bottle 1 is provided with a fourth external thread, and the protective cover 102 is provided with an internal thread that mates with the fourth external thread.

[0064] With this technical solution, air can be expelled from the negative pressure bottle 1 through the protective cover 102. This allows for faster drainage of fluid from the patient's body via pressure difference.

[0065] In this embodiment, the first tube 209, the second tube 3, the connecting device 2, etc. are all in sterile packaging, and can be taken out directly from the sterile packaging when in use.

[0066] The specific method of using this utility model is as follows:

[0067] Reference Figures 1-3 In use, the first tube 209 and the connecting tube 103 are first connected via the first external thread and the first internal thread. Then, the first tube 209 and the second tube 3 are connected via the second external thread and the second internal thread. The drainage bag 4 and the second tube 3 also need to be connected. Then, the air in the negative pressure bottle 1 is discharged through the opening connected to the protective cap 102. After the air in the negative pressure bottle 1 is discharged, the protective cap 102 is tightened. The drainage tube 101 is then connected to the patient's body, and drainage begins based on the pressure difference between the part of the patient's body that needs drainage and the negative pressure bottle 1.

[0068] As drainage continues, the drainage fluid in the negative pressure bottle 1 gradually fills the bottle. The switch plate 202 at the bottom of the bottle 1 is subjected to increasing gravity from the drainage fluid. Under the influence of a certain amount of drainage fluid, the switch plate 202 gradually slides in the first tube 209 until the drainage fluid gradually enters the part connecting the first tube 209 and the second tube 3, i.e., the through hole 205. When the set weight is reached (i.e., when the drainage fluid is almost full of the negative pressure bottle 1), the switch plate 202 and the base 206 come into contact and are fixed under the influence of the weight of the drainage fluid and the magnetic force of the magnetic chuck 203 and the magnetic chuck 208. The first tube 209 and the second tube 3 are connected. At this time, the drainage fluid enters the spherical structure 301 of the second tube 3 from the through hole 205 and enters the drainage bag 4 from the spherical structure 301, where it is temporarily stored until all the drainage fluid in the negative pressure bottle 1 enters the drainage bag 4.

[0069] After the drainage fluid in the negative pressure bottle 1 enters the drainage bag 4, since there is no drainage fluid to squeeze the switch plate 202, the elastic force of the telescopic spring 204 is greater than the magnetic attraction force between the magnetic ferrule 203 and the magnetic ferrule 208. The telescopic spring 204 drives the switch plate 202 to return to the initial position (i.e., the bottle mouth position at the bottom of the negative pressure bottle 1), so that the drainage fluid of the next negative pressure bottle 1 can be drained.

[0070] Example 2

[0071] This embodiment is the same as embodiment 1, except that in this embodiment, the base 206 is threadedly connected to the first tube 209.

[0072] In this embodiment, the base 206 has a third external thread on its side wall, and the first tube 209 has a third internal thread that mates with the third external thread.

[0073] The base 206 is threadedly connected to the first tube 209, which can change the position of the base 206 in the first tube 209, thereby changing the position of the exposed channel size of the switch plate 202 after it is connected to the base 206, thus changing the flow rate of the drainage fluid entering the drainage bag 4. There is no need to set up a separate flow control device, which reduces the cost of using this device while being able to control the flow rate.

[0074] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drainage device, comprising a negative pressure bottle (1) and a drainage bag (4), characterized in that: The negative pressure bottle (1) and the drainage bag (4) are connected by a connecting device (2). The connecting device (2) includes a first tube (209) connected to the negative pressure bottle (1). A base (206) and a switch plate (202) are provided inside the first tube (209). The base (206) and the switch plate (202) are connected by a telescopic device. The switch plate (202) is slidably connected to the first tube (209). The first tube (209) is connected to a second tube (3) connected to the drainage bag (4). The side wall of the first tube (209) is provided with several through holes (205) connected to the second tube (3). When the switch plate (202) slides to the through hole (205), the first tube (209) is connected to the second tube (3).

2. The drainage device according to claim 1, characterized in that: The switch plate (202) and the base (206) are respectively provided with a magnetic ferrule (203) and a magnetic ferrule (208).

3. The drainage device according to claim 1, characterized in that: The telescopic device is a spiral telescopic spring (204), and the base (206) is provided with a receiving groove (207) for accommodating the telescopic spring (204).

4. The drainage device according to claim 1, characterized in that: The base (206) is threadedly connected to the first tube (209).

5. A drainage device according to claim 1, characterized in that: A gap is provided between the wall of the second tube (3) and the corresponding part of the through hole (205).

6. A drainage device according to any one of claims 1-5, characterized in that: The switch plate (202) is provided with a side plate (201) that can fit against the bottom of the negative pressure bottle (1), and the side plate (201) is a flexible structure.

7. A drainage device according to any one of claims 1-5, characterized in that: The negative pressure bottle (1) has two openings, one of which is connected to a drainage tube (101), and the other opening is threadedly connected to a protective cap (102).

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