A pollution-proof negative pressure drain and its adapter

Abstract

The present invention discloses an anti-pollution negative pressure drainer and an adapter device thereof, which belong to the technical field of medical devices, including a negative pressure drainer and an adapter device. The adapter device is provided with two groups, and the two groups of adapter devices are respectively arranged on the drainage inlet and the drainage outlet of the negative pressure drainer. The negative pressure drainer is provided with a docking port, and the docking port is communicated with the interior of the negative pressure drainer. The docking port is provided with an anti-pollution device, which replaces the use of fillers such as waterproof tape in clinical practice to fill the gap between the drainage tube and the drainage inlet and the drain tube and the drainage outlet to prevent body fluid from overflowing. At the same time, the anti-pollution device can be used to sterilize and disinfect the internal collector of the negative pressure drainer and solidify the body fluid. Then, the negative pressure drainer can be directly removed and treated as medical waste. It can play a role of multiple protection in the clinical work of medical staff, and bring safety guarantees to medical staff and the medical environment.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an anti-pollution negative pressure drain and a switching device thereof. Background Art

[0002] Endoscopic nasobiliary drainage is a routine clinical endoscopic technique that can be directly applied to the treatment of obstructive jaundice, acute suppurative cholangitis, bile leakage, and other conditions. Postoperative placement of a nasobiliary duct can fully drain bile, reduce bile duct pressure, and lower the risk of postoperative pancreatitis and cholangitis. It also allows for observation of bile properties and outflow. For acute suppurative cholangitis and delayed biliary bleeding, sensitive antibiotics or hemostatics can be injected through the nasobiliary duct, with significant clinical efficacy.

[0003] When using the negative pressure drainage device for nasobiliary duct in clinical practice, due to different user groups, some patients with severe infectious diseases such as pneumonia are undergoing treatment. Since the body fluids produced in the patient's body are infectious, when the negative pressure drainage device collects a certain volume of the patient's body fluids and needs to discharge the body fluids, medical staff need to pay special attention to the operation process. A slight carelessness may cause the body fluids in the negative pressure drainage device to overflow, thereby causing pollution to medical staff and the medical environment. At the same time, since the drainage tubes and drainage tubes used in clinical practice are not the same as those of the negative pressure drainage device, The drainage devices are produced in sets, so the specifications and sizes of the drainage tube and the drainage tube are different, which will easily cause gaps when the drainage tube and the drainage tube are connected to the drainage inlet and drainage outlet on the negative pressure drainage device. In order to prevent the body fluid collected in the negative pressure drainage device from overflowing, waterproof tape and other fillers are used to fill the gaps between the drainage tube and the drainage inlet and between the drainage tube and the drainage outlet. However, this filling method is not effective enough. If the drainage tube or the drainage tube moves slightly, the filler will loosen, causing liquid overflow, thereby causing bacterial contamination. Summary of the Invention

[0004] The embodiments of the present invention provide an anti-pollution negative pressure drain and an adapter device thereof to solve the above-mentioned technical problems.

[0005] The embodiment of the present invention adopts the following technical solution: it includes a negative pressure drainer and a adapter device, the adapter device is provided with two groups, the two groups of adapter devices are respectively arranged on the drainage inlet and drainage outlet of the negative pressure drainer, the negative pressure drainer is provided with a docking port, the bottom end of the docking port extends to the interior of the negative pressure drainer, and the docking port is connected to the interior of the negative pressure drainer, and the docking port is provided with an anti-fouling device.

[0006] Furthermore, each group of the adapter devices includes a gasket, a sleeve, an adjusting sleeve and a pipeline restraint. The gasket is located on the corresponding drainage inlet and drainage outlet on the negative pressure drainer, and the edge of the gasket is fixedly connected to the negative pressure drainer. A through hole is provided in the middle of the gasket. The sleeve is located at the through hole in the middle of the gasket, and the bottom end of the sleeve is fixedly connected to the gasket. The adjusting sleeve is sleeved on the outside of the gasket, and one end of the adjusting sleeve extends toward the outside of the front end of the sleeve. The adjusting sleeve can slide left and right on the gasket. The pipeline restraint is located inside the sleeve, and the two ends of the pipeline restraint are respectively connected to the inside of the sleeve and the adjusting sleeve.

[0007] Furthermore, each of the pipeline restraints is a silicone tube with toughness and elasticity. The silicone tube is arranged in a conical shape, and the diameter of the end of the silicone tube facing the negative pressure drainer is larger than the diameter of the other end. The end of the silicone tube with a larger diameter is fixedly connected to the inner wall of the ring, and the end of the silicone tube with a smaller diameter is fixedly connected to the inner wall of the adjusting sleeve.

[0008] Furthermore, the end with the smaller diameter on each silicone tube is provided with a flange, and the size of the flange changes with the movement of the adjustment sleeve.

[0009] Furthermore, each of the sleeve rings is provided with a spring, and both ends of the spring are in contact with the corresponding washer and the adjusting sleeve respectively.

[0010] Furthermore, a sliding groove is provided on the outer wall of each of the rings, and a slider adapted to the sliding groove is provided on the inner wall of the adjusting sleeve near the gasket ring. One end of the slider is fixedly connected to the inner wall of the adjusting sleeve and the other end of the slider extends into the sliding groove, and the slider can slide in the sliding groove.

[0011] Furthermore, the outside of each adjusting sleeve is provided with anti-slip lines.

[0012] Furthermore, the anti-pollution device includes an anti-pollution box, the interior of the anti-pollution box is provided with a cavity, and two partitions are provided in the cavity. The two partitions can divide the interior of the anti-pollution box into three storage spaces. The bottom of the anti-pollution box is provided with a connecting port adapted to the docking port, and the top of the connecting port extends to the storage space located in the middle part of the anti-pollution box. The remaining two storage spaces in the anti-pollution box can respectively accommodate disinfectants and liquid coagulants. Liquid inlet holes are provided on the two partitions, and a silicone pad is provided at each liquid inlet hole, and the silicone pad is stuck in the corresponding liquid inlet hole in a non-stressed state. Two buttons made of flexible material are provided on the top of the anti-pollution box, and the bottom ends of the two buttons extend to the two storage spaces for placing disinfectants and liquid coagulants respectively.

[0013] Furthermore, the outside of the docking port is provided with a thread, and the inner wall of the connecting port at the bottom of the anti-fouling box is provided with a thread groove adapted to the thread.

[0014] Furthermore, a sealing cap is sleeved on the docking port, and the inner wall of the sealing cap is also provided with a thread groove adapted to the thread on the docking port.

[0015] The at least one technical solution adopted in the embodiment of the present invention can achieve the following beneficial effects:

[0016] First, by setting a connecting device at the drainage inlet of the negative pressure drainage device, the gap between the drainage tube and the drainage inlet and between the drainage tube and the drainage outlet can be filled instead of using fillers such as waterproof tape in clinical practice. While filling the gap between the drainage inlet and the drainage tube, it can be adapted to drainage tubes of different sizes for use, so that the body fluids collected in the negative pressure drainage device will not overflow, avoiding pollution to medical staff and the medical environment due to liquid overflow.

[0017] Secondly, the present invention can be divided into two usage modes according to different user groups:

[0018] First, when a patient suffers from a severe infectious disease such as pneumonia, when the negative pressure drainage device collects a certain volume of the patient's body fluids, the sealing cap on the docking port can be removed, and then the anti-fouling device can be installed on the docking port. The anti-fouling device can be used to sterilize and disinfect the interior of the negative pressure drainage device and solidify the body fluids. The negative pressure drainage device can then be directly removed and treated as medical waste. In this way, the body fluids with infectious diseases can be independently processed in the negative pressure drainage device without worrying about contamination such as liquid overflow. This can provide multiple protections for medical staff in their clinical work, prevent bacterial infection, and provide safety for medical staff and the medical environment.

[0019] Second, when the patient does not suffer from severe infectious diseases such as pneumonia, there is no need to activate the anti-fouling device. When the negative pressure drainage device collects a certain volume of the patient's body fluids, the drainage tube can be inserted into the adapter on the drainage outlet to drain the body fluids inside the negative pressure drainage device, and the gap between the drainage tube and the drainage outlet can be filled through the adapter on the drainage outlet to adapt to drainage tubes of different sizes for use, so as to prevent the liquid inside the negative pressure drainage device from overflowing, and play a good protective role for the drainage inlet and drainage outlet, which can effectively avoid pollution to medical staff and the medical environment due to liquid overflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 Schematic diagram of the three-dimensional structure of the negative pressure drain device and the sealing cap in the present invention;

[0023] Figure 3 Schematic diagram of the three-dimensional structure of the switching device in the present invention Figure 1 ;

[0024] Figure 4 Schematic diagram of the three-dimensional structure of the switching device in the present invention Figure 2 ;

[0025] Figure 5 Schematic diagram of the three-dimensional structure of the switching device in the present invention Figure 3 ;

[0026] Figure 6 This is a schematic diagram of the disassembled structure of the adapter device of the present invention;

[0027] Figure 7 A side view of the internal structure of the transfer device of the present invention;

[0028] Figure 8 Schematic diagram of the three-dimensional structure of the anti-fouling device of the present invention;

[0029] Figure 9 Schematic diagram of the internal structure of the anti-fouling box of the present invention.

[0030] Reference numerals

[0031] Negative pressure drain device 1, docking port 11, thread 111, sealing cap 12, adapter 2, gasket 21, through hole 211, collar 22, slide groove 221, slider 222, adjusting sleeve 23, anti-slip pattern 231, pipeline restraint 24, silicone tube 25, spring 26, anti-fouling device 3, anti-fouling box 31, cavity 311, partition 32, liquid inlet 321, silicone pad 322, connecting port 33, button 34. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] The technical solutions provided by various embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] An embodiment of the present invention provides an anti-pollution negative pressure drain device and an adapter device thereof, comprising a negative pressure drain device 1 and an adapter device 2. The adapter device 2 is provided with two groups, and the two groups of adapter devices 2 are respectively arranged on the drainage inlet and drainage outlet of the negative pressure drain device 1. The negative pressure drain device 1 is provided with a docking port 11, the bottom end of the docking port 11 extends to the interior of the negative pressure drain device 1, and the docking port 11 is connected to the interior of the negative pressure drain device 1. The docking port 11 is provided with an anti-pollution device 3. When in use, the device can connect the drainage tube to the adapter device 2 on the drainage inlet to ensure that the negative pressure drain device 1 can normally collect the patient's body fluids. It can be used in two ways according to different user groups;

[0035] First, when a patient suffers from a severe infectious disease such as pneumonia, after the negative pressure drainage device 1 has collected a certain volume of the patient's body fluid, the anti-fouling device 3 can be used to sterilize and disinfect the interior of the negative pressure drainage device 1 and solidify the body fluid, and then the negative pressure drainage device 1 can be directly removed and treated as medical waste;

[0036] Secondly, when the patient does not suffer from severe infectious diseases such as pneumonia, there is no need to activate the anti-fouling device 3. When the negative pressure drainage device 1 collects a certain volume of the patient's body fluids, the drainage tube can be inserted into the adapter device 2 on the drainage outlet to drain the body fluids inside the negative pressure drainage device 1.

[0037] Preferably, each group of the adapter device 2 includes a gasket 21, a sleeve 22, an adjusting sleeve 23 and a pipeline restraint 24, the gasket 21 is located on the corresponding drainage inlet and drainage outlet on the negative pressure drainer 1, and the edge of the gasket 21 is fixedly connected to the negative pressure drainer 1, a through hole 211 is provided in the middle of the gasket 21, the sleeve 22 is located at the through hole 211 in the middle of the gasket 21, and the bottom end of the sleeve 22 is fixedly connected to the gasket 21, the adjusting sleeve 23 is sleeved on the outside of the gasket 21, and one end of the adjusting sleeve 23 extends toward the outside of the front end of the sleeve 22, the adjusting sleeve 23 can slide left and right on the gasket 21, the pipeline restraint 24 is located inside the sleeve 22, and the two ends of the pipeline restraint 24 are respectively connected to the inside of the sleeve 22 and the adjusting sleeve 23;

[0038] Each of the pipe restraints 24 is a tough and elastic silicone tube 25. The silicone tube 25 is conical, and the diameter of the end of the silicone tube 25 facing the negative pressure drain 1 is larger than the diameter of the other end. The end with the larger diameter of the silicone tube 25 is fixedly connected to the inner wall of the collar 22, and the end with the smaller diameter of the silicone tube 25 is fixedly connected to the inner wall of the adjustment sleeve 23.

[0039] The end with the smaller diameter on each of the silicone tubes 25 is provided with a flange, and the size of the flange will change with the movement of the adjusting sleeve 23. When in use, the end of the drainage tube can be pulled toward the drainage inlet. Since the specifications of the drainage tubes are different, in order to ensure that the drainage tube can be inserted into the negative pressure drain device 1 without liquid overflow, the medical staff needs to grasp the adjusting sleeve 23 at the drainage inlet and push the adjusting sleeve 23 toward the gasket 21. When the adjusting sleeve 23 moves on the ring 22, it will pull the end with the smaller diameter on the silicone tube 25 to move gradually backward. Since the end with the smaller diameter on the silicone tube 25 is itself in a flanged state, the flanged part of the silicone tube 25 will also keep synchronous displacement with the movement of the adjusting sleeve 23. At this time, the diameter of the flanged part on the silicone tube 25 will also increase until it can accommodate the drainage tube.

[0040] Then, the end of the drainage tube is inserted into the silicone tube 25 from the end with the smaller diameter on the silicone tube 25. When the end of the drainage tube extends to the interior of the negative pressure drainage device 1, the medical staff can pull the adjusting sleeve 23 in the opposite direction, so that the adjusting sleeve 23 moves in the opposite direction and pulls the end with the smaller diameter on the silicone tube 25 to gradually turn over to the surface of the drainage tube and cover the drainage tube, and the silicone tube 25 will form a wrapping state for the drainage tube. When the drainage tube cannot move in the wrapped state of the silicone tube 25, the pulling of the adjusting sleeve 23 can be stopped and the position of the adjusting sleeve 23 on the collar 22 can be limited to maintain the fixed state of the drainage tube by the silicone tube 25. At this time, the silicone tube 25 will cooperate with the gasket 21 to fill the gap between the drainage inlet of the negative pressure drainage device 1 and the drainage tube, and under the wrapping effect of the silicone tube 25 on the drainage tube, the end of the drainage tube can be controlled to be a fixed position inside the negative pressure drainage device 1;

[0041] When the patient does not suffer from severe infectious diseases such as pneumonia, when the negative pressure drainage device 1 collects the patient's body fluid to a certain capacity, the adjusting sleeve 23 on the drainage outlet can be pushed toward the corresponding gasket 21, so that the end with a smaller diameter on the silicone tube 25 at this part also gradually continues to be flanged toward the gasket 21, thereby increasing the diameter of the flanged part of the silicone tube 25, and then the end of the drainage tube is inserted into the silicone tube 25 at the drainage outlet again, and the corresponding adjusting sleeve 23 is pulled in the opposite direction again, so that the end with a smaller diameter on the silicone tube 25 at the drainage outlet also gradually covers the surface of the drainage tube until the drainage tube is also wrapped. The position of the adjusting sleeve 23 at this part is again limited on the sleeve 22, so as to prevent the liquid inside the negative pressure drainage device 1 from overflowing, and play a good protective role for the drainage inlet and drainage outlet, and can effectively avoid pollution to medical staff and the medical environment caused by liquid overflow.

[0042] Preferably, each of the sleeve rings 22 is provided with a spring 26, and the two ends of the spring 26 are in contact with the corresponding gasket 21 and the adjusting sleeve 23 respectively. When the medical staff pulls the corresponding adjusting sleeve 23 in the opposite direction, the provided spring 26 can generate a thrust between the corresponding gasket 21 and the adjusting sleeve 23, so that the smaller-diameter end of each silicone tube 25 remains in a fixed state after forming a wrapped state around the drainage tube and the discharge tube, thereby assisting the medical staff's operation to prevent the medical staff's hands from loosening and causing the adjusting sleeve 23 to move back and forth, causing the drainage tube or the discharge tube to be dislocated, thereby avoiding overflow of liquid inside the negative pressure drainer 1.

[0043] Preferably, a slide groove 221 is provided on the outer wall of each of the collars 22, and a slider 222 adapted to the slide groove 221 is provided on the inner wall of the adjusting sleeve 23 near the gasket 21. One end of the slider 222 is fixedly connected to the inner wall of the adjusting sleeve 23 and the other end of the slider 222 extends into the slide groove 221. The slider 222 can slide in the slide groove 221. When each adjusting sleeve 23 is moved, the slider 222 in the adjusting sleeve 23 will move in the corresponding slide groove 221, and the sliding of the outer wall of each collar 22 The groove 221 can control the corresponding slider 222 to move in a straight line, thereby preventing the adjusting sleeve 23 from rotating or angularly shifting, thereby preventing the adjusting sleeve 23 from excessively pulling the silicone tube 25 due to rotation, thereby preventing the silicone tube 25 from breaking due to excessive pulling. At the same time, the sliding groove 221 on each collar 22 also limits the movable range of the slider 222, thereby also limiting the movable range of each corresponding adjusting sleeve 23 to prevent the adjusting sleeve 23 from being dislocated on the collar 22.

[0044] Preferably, each of the adjusting sleeves 23 is provided with anti-slip grooves 231 on the outside. The anti-slip grooves 231 provided on the outside of each adjusting sleeve 23 can increase the friction when the medical staff's hand contacts the corresponding adjusting sleeve 23, and can prevent the medical staff from slipping when pushing and pulling the adjusting sleeve 23, thereby ensuring the stability of the medical staff when controlling the adjusting sleeve 23.

[0045] Preferably, the anti-pollution device 3 includes an anti-pollution box 31, the interior of the anti-pollution box 31 is provided with a cavity 311, and two partitions 32 are provided in the cavity 311. The two partitions 32 can divide the interior of the anti-pollution box 31 into three accommodating spaces. The bottom of the anti-pollution box 31 is provided with a connecting port 33 adapted to the docking port 11, and the top of the connecting port 33 extends to the accommodating space in the middle part of the anti-pollution box 31. The remaining two accommodating spaces in the anti-pollution box 31 can respectively accommodate disinfectant and liquid coagulant. Both partitions 32 are provided with liquid inlet holes 321. A silicone pad 322 is provided at each liquid inlet hole 321, and the silicone pad 322 is stuck in the corresponding liquid inlet hole 321 in a non-stressed state. Two buttons 34 made of flexible material are provided on the top of the anti-fouling box 31, and the bottom ends of the two buttons 34 extend to two receiving spaces for placing disinfectants and liquid coagulants respectively. The anti-fouling box 31 in the present invention and the disinfectants and liquid coagulants placed therein are all equipped during production and are disposable. There is no need for medical staff to add disinfectants and liquid coagulants in the anti-fouling box 31 for a second time.

[0046] Preferably, the outside of the docking port 11 is provided with a thread 111, and the inner wall of the connecting port 33 at the bottom of the anti-pollution box 31 is provided with a thread groove adapted to the thread 111. When the patient suffers from a severe infectious disease such as pneumonia, the connecting port 33 at the bottom of the anti-pollution box 31 can be connected to the docking port 11 on the negative pressure drain device 1, and the anti-pollution box 31 is gradually rotated to make the thread groove inside the connecting port 33 and the thread 111 on the docking port 11 produce a thread 111 match, so that the connecting port 33 and the docking port 11 can remain connected, thereby completing the installation of the anti-pollution box 31 and the negative pressure drain device 1;

[0047] When the negative pressure drainage device 1 collects a certain amount of body fluid from the patient, the button 34 on the anti-fouling box 31 where the disinfectant is placed can be pressed. As the button 34 at this location is gradually pressed downward, the disinfectant in the anti-fouling box 31 will, under pressure, apply pressure to the silicone pad 322 in the liquid inlet hole 321 on the corresponding partition 32. As the silicone pad 322 gradually separates from the liquid inlet hole 321, the disinfectant in the anti-fouling box 31 will also be transported from the connecting port 33 to the interior of the negative pressure drainage device 1 by the squeezing force generated by the corresponding button 34. At this time, the injected disinfectant will sterilize and disinfect the body fluid collected in the negative pressure drainage device 1.

[0048] Then, the button 34 on the anti-fouling box 31 where the liquid coagulant is placed is pressed. As the button 34 is squeezed, the liquid coagulant inside the anti-fouling box 31 will gradually separate the silicone pad 322 inside the liquid inlet 321 on the partition 32 at the corresponding position. As the liquid coagulant is injected into the interior of the negative pressure drain 1, the liquid coagulant will mix with the liquid inside the negative pressure drain 1 and gradually convert the liquid into a solid state. At this time, there is no liquid substance inside the negative pressure drain 1. After the drainage tube is removed, the entire negative pressure drain 1 together with the anti-fouling box 31 can be directly disposed of as medical waste.

[0049] By sterilizing and disinfecting the body fluids collected in the negative pressure drainage device 1 and then solidifying them, body fluids with infectious diseases can be independently treated in the negative pressure drainage device 1 without worrying about contamination such as liquid overflow. This can provide multiple protections for medical staff in their clinical work, prevent bacterial infection, and provide safety for medical staff and the medical environment.

[0050] Preferably, a sealing cap 12 is provided on the docking port 11, and the inner wall of the sealing cap 12 is also provided with a threaded groove that is compatible with the thread 111 on the docking port 11. When the negative pressure drainage device 1 in the present invention is not in use, the sealing cap 12 configured during production and preparation is used to seal the docking port 11 on the negative pressure drainage device 1. The threaded groove provided in the sealing cap 12 can be disassembled and assembled synchronously with the anti-fouling box 31, thereby facilitating medical staff to disassemble the sealing cap 12 and install the anti-fouling box 31. At the same time, according to different user groups, when the patient does not suffer from severe infectious diseases such as pneumonia, there is no need to remove the sealing cap 12, nor is there any need to use the anti-fouling device 3, thereby saving medical resources and avoiding waste.

[0051] The foregoing is merely an embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A pollution-proof negative pressure drain, characterized in that: The invention comprises a negative pressure drainer (1) and an adapter device (2), wherein the adapter device (2) is provided with two groups, and the two groups of adapter devices (2) are respectively arranged on the drainage inlet and the drainage outlet of the negative pressure drainer (1); the negative pressure drainer (1) is provided with a docking port (11); the bottom end of the docking port (11) extends to the interior of the negative pressure drainer (1), and the docking port (11) is connected to the interior of the negative pressure drainer (1); and the docking port (11) is provided with an anti-fouling device (3); Each set of the adapter device (2) includes a gasket (21), a sleeve (22), an adjustment sleeve (23) and a pipeline restraint (24), wherein the gasket (21) is located on the corresponding drainage inlet and drainage outlet of the negative pressure drainer (1), and the edge of the gasket (21) is fixedly connected to the negative pressure drainer (1), a through hole (211) is provided in the middle of the gasket (21), and the sleeve (22) is located at the through hole (211) in the middle of the gasket (21), and The bottom end of the collar (22) is fixedly connected to the gasket (21), the adjusting sleeve (23) is sleeved on the outside of the gasket (21), and one end of the adjusting sleeve (23) extends toward the outside of the front end of the collar (22), and the adjusting sleeve (23) can slide left and right on the gasket (21), and the pipeline restraining member (24) is located inside the collar (22), and the two ends of the pipeline restraining member (24) are respectively connected to the inside of the collar (22) and the adjusting sleeve (23); Each of the pipeline restraints (24) is a silicone tube (25) with toughness and elasticity. The silicone tube (25) is configured in a conical shape, and the diameter of one end of the silicone tube (25) facing the negative pressure drain device (1) is larger than the diameter of the other end. The end of the silicone tube (25) with a larger diameter is fixedly connected to the inner wall of the ring (22), and the end of the silicone tube (25) with a smaller diameter is fixedly connected to the inner wall of the adjustment sleeve (23); the end of each silicone tube (25) with a smaller diameter is configured as a flange, and the size of the flange changes with the movement of the adjustment sleeve (23).

2. The anti-pollution negative pressure drain according to claim 1, characterized in that: A spring (26) is sleeved on each of the sleeve rings (22), and two ends of the spring (26) are in contact with the corresponding backing ring (21) and the adjustment sleeve (23), respectively.

3. The anti-pollution negative pressure drain according to claim 1, characterized in that: A slide groove (221) is provided on the outer wall of each of the collars (22), and a slider (222) adapted to the slide groove (221) is provided on the inner wall of the adjusting sleeve (23) near the gasket ring (21). One end of the slider (222) is fixedly connected to the inner wall of the adjusting sleeve (23) and the other end of the slider (222) extends into the slide groove (221), and the slider (222) can slide in the slide groove (221).

4. The anti-pollution negative pressure drain according to claim 1, characterized in that: The exterior of each adjusting sleeve (23) is provided with anti-slip patterns (231).

5. The anti-pollution negative pressure drain according to claim 1, characterized in that: The anti-fouling device (3) includes an anti-fouling box (31), the interior of the anti-fouling box (31) is provided with a cavity (311), two partitions (32) are provided in the cavity (311), and the two partitions (32) can divide the interior of the anti-fouling box (31) into three accommodating spaces. The bottom of the anti-fouling box (31) is provided with a connecting port (33) adapted to the docking port (11), and the top end of the connecting port (33) extends to the accommodating space located in the middle portion of the anti-fouling box (31). The remaining two accommodating spaces can respectively accommodate a disinfectant and a liquid coagulant. Both partitions (32) are provided with a liquid inlet hole (321). A silicone pad (322) is provided at each liquid inlet hole (321), and the silicone pad (322) is just stuck in the corresponding liquid inlet hole (321) in a non-stressed state. Two buttons (34) made of a flexible material are provided above the anti-fouling box (31), and the bottom ends of the two buttons (34) extend to the two accommodating spaces for placing the disinfectant and the liquid coagulant, respectively.

6. The anti-pollution negative pressure drain according to claim 5, characterized in that: The outside of the docking port (11) is provided with a thread (111), and the inner wall of the connecting port (33) at the bottom of the anti-fouling box (31) is provided with a thread groove that matches the thread (111).

7. The anti-pollution negative pressure drain according to claim 1, characterized in that: A sealing cap (12) is sleeved on the docking port (11), and an inner wall of the sealing cap (12) is also provided with a thread groove that matches the thread (111) on the docking port (11).

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