A drainage bag with anti-suction structure

Abstract

A drainage bag with anti-suction structure, including anti-suction valve, gravity trigger unit and drainage bag, characterized in that the anti-suction valve, gravity trigger unit and duckbill valve constitute a triple anti-suction structure, the anti-suction valve includes valve body, guide column and elastic diaphragm, the gravity trigger unit includes gravity ball, annular guide groove and shell, when an accident occurs, the duckbill valve is automatically closed, the elastic diaphragm slides under the pressure of the liquid and forms a seal with the circular truncated cone cavity, the gravity ball is pressed under the action of buoyancy to enhance the sealing of the elastic diaphragm, the exhaust passage and the negative pressure balance passage constitute a double protection structure, which maintains the balance of the air pressure in the bag, the exhaust passage is provided with a hydrophobic and breathable membrane I and a polypropylene melt-blown antibacterial layer, the negative pressure balance passage includes a negative pressure regulating valve, a one-way air valve and a hydrophobic and breathable membrane II, the drainage tube is quickly connected or unlocked with the drainage device through a push-pull buckle joint, effectively solving the problems of not being able to use the triple anti-suction structure and not being able to use the double protection structure.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a drainage bag with an anti-backflow structure. Background Technology

[0002] Anti-backflow drainage bags utilize fluid dynamics control principles, employing filters and valves to direct the flow of patient fluids, preventing backflow and the associated risk of infection. This effectively protects patient safety and reduces the difficulty and risk for medical staff during surgery. Currently, anti-backflow drainage bags are widely used in various surgical fields and for various fluid drainage and collection procedures. However, existing anti-backflow drainage bags cannot achieve a triple anti-backflow structure using an anti-backflow valve, gravity trigger unit, and duckbill valve. This makes it impossible to more stably, reliably, and safely enhance the anti-backflow performance of the drainage bag, minimize the risk of infection during drainage, or utilize a dual protection structure with an exhaust channel and negative pressure balance channel. Furthermore, they cannot simultaneously maintain normal air pressure balance within the drainage bag and cope with unexpected extreme air pressure fluctuations during drainage, nor can they prevent tissue damage or collapse of the drainage device.

[0003] Patent No. ZL202420182590.3 discloses a "backflow-proof disposable negative pressure drainage bottle." This utility model includes a bottle body and a backflow prevention mechanism. A top plate is fixedly installed on the top of the bottle body, and the top plate has a suction hole and a discharge hole. The suction hole has a suction tube. The backflow prevention mechanism includes a backflow prevention tube, a fixing tube, and a backflow prevention float. One end of the backflow prevention tube is a connecting part, and the other end is a mesh part. The backflow prevention tube passes through the discharge hole, and the connecting part is connected to the top plate. A discharge outlet is provided on one side of the connecting part, and the discharge outlet has a discharge tube. The fixing tube is located inside the backflow prevention tube, and the backflow prevention float is installed inside the fixing tube and slidably connected to the fixing tube. This utility model automatically closes when the drainage fluid in the negative pressure drainage bottle is too full, preventing the drainage fluid from being sucked into the central negative pressure suction system and ensuring the safe operation of the central negative pressure suction system.

[0004] The invention patent with patent number ZL202420473828.8 discloses an "anti-backflow drainage bag". This utility model includes a drainage bag with an insertion interface at the top and a drainage port at the bottom; a drainage tube with one end connected to the insertion interface and the other end connected to a silicone branch tube; a flow-blocking device with a tube hole, which is detachably connected to the outer wall of the drainage tube through the tube hole; the flow-blocking device includes a housing with a clamping block and a motor inside, one side of the clamping block being located inside the tube hole and in contact with the outer wall of the drainage tube, the clamping block being slidably connected to the housing via a slide rail, and a screw hole on the side of the clamping block away from the tube hole, which is connected to the motor via a screw; and a tilt sensor inside the housing, which is electrically connected to the motor. Summary of the Invention

[0005] To address the aforementioned technical problems, this utility model provides a drainage bag with an anti-backflow structure. It includes an anti-backflow valve, a gravity triggering unit, a duckbill valve, an exhaust channel, a negative pressure balance channel, and the drainage bag itself. This triple anti-backflow structure, utilizing the anti-backflow valve, gravity triggering unit, and duckbill valve simultaneously, significantly enhances the anti-backflow performance of the drainage bag, minimizing the patient's infection risk during drainage. The dual protection structure, with the exhaust channel and negative pressure balance channel working together, maintains normal air pressure balance within the drainage bag and handles unexpected extreme air pressure fluctuations during drainage, preventing tissue damage or collapse of the drainage device. This effectively solves the aforementioned technical problems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problem is as follows: The aforementioned drainage bag with an anti-backflow structure includes an anti-backflow valve, a gravity triggering unit, and a drainage bag, characterized in that, The anti-backflow valve includes a valve body, a guide post, and an elastic diaphragm. The valve body has a frustum-shaped cavity inside, with its central axis aligned with the valve body's central axis. The upper opening of the frustum-shaped cavity is the inlet, and the lower opening is the outlet. The diameter of the inlet is smaller than the diameter of the outlet. A guide post is positioned along the entire length of the frustum-shaped cavity's central axis. Both ends of the guide post are fixedly connected to the valve body via support frames. An elastic diaphragm is slidably fitted onto the guide post, with its central axis aligned with the guide post's central axis. The diameter of the elastic diaphragm matches the inner diameter of the outlet. The gravity triggering unit includes a gravity ball, an annular guide groove, and a housing. The annular guide groove is located at the center of the housing, and its two ends are symmetrically fixed to the two sides of the upper end of the housing by support frames. The annular guide groove is configured as an upward-opening groove, and the gravity ball is rolled around in the groove. The shape of the groove matches the shape of the gravity ball. The height of the groove is less than the diameter of the gravity ball, and the height of the groove is greater than the radius of the gravity ball. The gravity ball is configured as a hollow structure, and a sealing layer is provided on the surface of the gravity ball. The density of the gravity ball is less than the density of the drainage liquid. A through groove is opened at the lower end of the annular guide groove, and the length of the through groove is greater than the diameter of the gravity ball. The drainage bag is rectangular, with an inlet channel at the center of the top of the bag. The top of the inlet channel is connected to a drainage tube. Both sides of the drainage bag have a capacity scale. An exhaust channel is located on one side of the top of the drainage bag. A double-layer filter is installed at the upper end of the exhaust channel. The inner layer of the double-layer filter is a hydrophobic and breathable membrane I, and the outer layer is a polypropylene meltblown antibacterial layer. A drainage channel is located at the center of the bottom of the drainage bag, and a control valve is installed at the lower end of the drainage channel.

[0007] It also includes a negative pressure balance channel, which includes a negative pressure regulating valve, a one-way vent valve, and a hydrophobic and breathable membrane II. The negative pressure balance channel is located on the side wall of the drainage tube. A one-way vent valve is located at the other end of the negative pressure balance channel. A hydrophobic and breathable membrane II is located inside the one-way vent valve. A negative pressure regulating valve is located on the side of the negative pressure balance channel.

[0008] The anti-backflow valve and gravity triggering unit are disposed in the liquid inlet channel. The outer diameter of the valve body and the housing is equal to the inner diameter of the liquid inlet channel. The lower end of the anti-backflow valve is fixedly connected to the upper end of the gravity triggering unit. The liquid inlet channel, anti-backflow valve, gravity triggering unit, exhaust channel, drainage channel, drainage bag, drainage tube and negative pressure balance channel are configured as an integral molded structure.

[0009] It also includes a duckbill valve, the inlet of which is connected to the lower port of the gravity triggering unit.

[0010] The anti-backflow valve, gravity trigger unit, and duckbill valve together form a triple anti-backflow structure, which can enhance the stability, reliability, and safety of anti-backflow performance when the patient's position changes or when there are unexpected fluctuations in external pressure.

[0011] The exhaust channel and the negative pressure balance channel together form a dual protection structure, which can simultaneously maintain the normal air pressure balance in the drainage bag and cope with unexpected situations of extreme air pressure fluctuations, thus achieving the purpose of dual protection for drainage safety.

[0012] It also includes a push-pull snap-fit ​​connector, which includes a male and a female connector. The male connector is sealed and connected to the drainage device, and the female connector is sealed and connected to the other end of the drainage tube. The male and female connectors achieve quick connection and unlocking through a sliding sleeve, a snap ring, and a groove.

[0013] The drainage bag is made of soft, transparent medical-grade PVC material; The elastic diaphragm is made of medical-grade silicone rubber. The gravity ball is made of polypropylene, and the sealing layer is made of silicone. The annular guide groove is made of medical-grade stainless steel.

[0014] The beneficial effects of this utility model are: This invention incorporates an anti-backflow valve, a gravity triggering unit, and a duckbill valve, along with corresponding inlet channels, drainage tubes, and drainage bags. It achieves a triple anti-backflow structure using the anti-backflow valve, gravity triggering unit, and duckbill valve simultaneously, thus more stably, reliably, and safely enhancing the anti-backflow performance of the drainage bag. This minimizes the patient's infection risk during drainage, effectively solving the problem that the inability to use the anti-backflow valve, gravity triggering unit, and duckbill valve together to form a triple anti-backflow structure prevents a more stable, reliable, and safe enhancement of the drainage bag's anti-backflow performance and minimizes the patient's infection risk during drainage.

[0015] This invention features an exhaust channel and a negative pressure balance channel, along with corresponding drainage bags. This dual-protection structure, where the exhaust channel and negative pressure balance channel work together, maintains normal air pressure balance within the drainage bag during drainage and addresses unexpected extreme pressure fluctuations. This prevents tissue damage or collapse of the drainage device, effectively solving the problem that without a dual-protection structure using both exhaust and negative pressure balance channels, it is impossible to maintain normal air pressure balance within the drainage bag and address unexpected extreme pressure fluctuations during drainage, thus failing to prevent tissue damage or collapse of the drainage device. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the structure of this utility model; Appendix Figure 2 This is a cross-sectional structural diagram of the anti-backflow valve and gravity triggering unit of this utility model; Appendix Figure 3 This is a top view of the anti-backflow valve of this utility model. Appendix Figure 4 This is a bottom view of the anti-backflow valve of this utility model. Appendix Figure 5 This is a top view of the gravity triggering unit of this utility model. Appendix Figure 6 This is a cross-sectional structural diagram of the negative pressure balance channel of this utility model; Appendix Figure 7 This is a cross-sectional structural diagram of the exhaust channel of this utility model.

[0017] Legend: 1. Anti-backflow valve, 2. Gravity trigger unit, 3. Drainage bag, 4. Valve body, 5. Guide column, 6. Elastic diaphragm, 7. Frustum-shaped cavity, 8. Inlet, 9. Outlet, 10. Support frame, 11. Gravity ball, 12. Annular guide groove, 13. Shell, 14. Groove, 15. Sealing layer, 16. Through groove, 17. Inlet channel, 18. Drainage tube, 19. Capacity scale, 20. Exhaust channel, 21. Double-layer filter device, 22. Hydrophobic and breathable membrane I, 23. Polypropylene melt-blown antibacterial layer, 24. Drainage channel, 25. Control valve, 26. Negative pressure balance channel, 27. Negative pressure regulating valve, 28. One-way vent valve, 29. Hydrophobic and breathable membrane II, 30. Duckbill valve, 31. Push-pull snap-on connector, 32. Male connector, 33. Female connector. Detailed Implementation

[0018] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The present invention will be further described in detail with reference to the embodiments, so that the public can better understand the implementation method of the present invention. The specific implementation method of the present invention is as follows: The aforementioned drainage bag with an anti-backflow structure includes an anti-backflow valve 1, a gravity triggering unit 2, and a drainage bag 3, characterized in that... The anti-backflow valve 1 includes a valve body 4, a guide post 5, and an elastic diaphragm 6. The valve body 4 has a frustum-shaped cavity 7 inside, and the central axis of the frustum-shaped cavity 7 is set on the central axis of the valve body 4. The opening at the upper end of the frustum-shaped cavity 7 is set as a liquid inlet 8, and the opening at the lower end of the frustum-shaped cavity 7 is set as a liquid outlet 9. The diameter of the liquid inlet 8 is smaller than the diameter of the liquid outlet 9. The guide post 5 is set along the entire length of the central axis of the frustum-shaped cavity 7. The two ends of the guide post 5 are fixedly connected to the two ends of the valve body 4 by support frames 10 respectively. The elastic diaphragm 6 is slidably sleeved on the guide post 5. The central axis of the elastic diaphragm 6 is set on the central axis of the guide post 5, and the diameter of the elastic diaphragm 6 matches the inner diameter of the liquid outlet 9. The gravity triggering unit 2 includes a gravity ball 11, an annular guide groove 12, and a housing 13. The annular guide groove 12 is located at the center of the housing 13. The two ends of the annular guide groove 12 are symmetrically fixed to the two sides of the upper end of the housing 13 by a support frame 10. The annular guide groove 12 is configured as an upward-opening groove body 14. The gravity ball 11 is rolled and fitted on the groove body 14. The shape of the groove body 14 matches the shape of the gravity ball 11. The height of the groove body 14 is less than the diameter of the gravity ball 11, and the height of the groove body 14 is greater than the radius of the gravity ball 11. The gravity ball 11 is configured as an internal hollow structure. A sealing layer 15 is provided on the surface of the gravity ball 11. The density of the gravity ball 11 is less than the density of the drainage liquid. A through groove 16 is opened at the lower end of the annular guide groove 12. The length of the through groove 16 is greater than the diameter of the gravity ball 11. The drainage bag 3 is a rectangular bag structure. A liquid inlet channel 17 is provided at the middle of the top of the drainage bag 3. The top of the liquid inlet channel 17 is connected to a drainage tube 18. Both sides of the drainage bag 3 are provided with a capacity scale 19. An exhaust channel 20 is provided on one side of the top of the drainage bag 3. A double-layer filter device 21 is provided at the upper port of the exhaust channel 20. The inner layer of the double-layer filter device 21 is a hydrophobic and breathable membrane I 22. The outer layer of the double-layer filter device 21 is a polypropylene meltblown antibacterial layer 23. A drainage channel 24 is provided at the center of the bottom of the drainage bag 3. A control valve 25 is provided at the lower port of the drainage channel 24.

[0019] It also includes a negative pressure balancing channel 26, which includes a negative pressure regulating valve 27, a one-way vent valve 28, and a hydrophobic and breathable membrane II 29. The negative pressure balancing channel 26 is disposed on the side wall of the drainage tube 18, and a one-way vent valve 28 is disposed at the other end of the negative pressure balancing channel 26. A hydrophobic and breathable membrane II 29 is disposed inside the one-way vent valve 28, and a negative pressure regulating valve 27 is disposed on the side of the negative pressure balancing channel 26.

[0020] The anti-backflow valve 1 and the gravity triggering unit 2 are disposed in the liquid inlet channel 17. The outer diameter of the valve body 4 and the housing 13 is equal to the inner diameter of the liquid inlet channel 17. The lower end of the anti-backflow valve 1 is fixedly connected to the upper end of the gravity triggering unit 2. The liquid inlet channel 17, the anti-backflow valve 1, the gravity triggering unit 2, the exhaust channel 20, the drainage channel 24, the drainage bag 3, the drainage tube 18, and the negative pressure balance channel 26 are configured as an integrally formed structure.

[0021] It also includes a duckbill valve 30, the inlet of which is connected to the lower port of the gravity triggering unit 2.

[0022] The anti-backflow valve 1, gravity triggering unit 2, and duckbill valve 30 together constitute a triple anti-backflow structure, which can enhance the stability, reliability, and safety of anti-backflow performance when the patient's position changes or external pressure fluctuates unexpectedly. When the internal pressure of the drainage bag 3 increases, the duckbill valve 30 automatically closes. Under the action of buoyancy, the gravity ball 11 rolls up along the annular guide groove 12 to compress the elastic diaphragm 6 to enhance the seal. The elastic diaphragm 6 is subjected to the upward pressure of the gravity ball 11 and the liquid, and moves upward along the guide column 5 to form a seal with the frustum-shaped cavity 7. The upward inner diameter of the frustum-shaped cavity 7 gradually decreases. The greater the pressure on the elastic diaphragm 6, the better the anti-backflow performance of the elastic diaphragm 6 and the frustum-shaped cavity 7.

[0023] The exhaust channel 20 and the negative pressure balance channel 26 together form a dual protection structure, which can simultaneously maintain the normal air pressure balance in the drainage bag 3 and cope with unexpected situations of extreme air pressure fluctuations, achieving the purpose of dual protection for drainage safety. When the pressure inside the drainage bag 3 is high, the exhaust channel 20 discharges gas through the double-layer filter device 21 in real time to maintain the internal and external pressure balance. When extreme air pressure fluctuations occur and the negative pressure inside the drainage bag 3 exceeds the set value, the negative pressure regulating valve 27 automatically opens, and outside air enters the drainage bag 3 through the hydrophobic and breathable membrane II 29, the one-way ventilation valve 28, and the drainage tube 18 to balance the negative pressure inside the bag, effectively preventing the risk of backflow or damage to the patient.

[0024] It also includes a push-pull snap-fit ​​connector 31, which includes a male connector 32 and a female connector 33. The male connector 32 is sealed to the drainage device, and the female connector 33 is sealed to the other end of the drainage tube 18. The male connector 32 and the female connector 33 achieve quick connection and unlocking through a sliding sleeve, a snap ring and a groove.

[0025] The drainage bag 3 is made of soft, transparent medical-grade PVC material; The elastic diaphragm 6 is made of medical-grade silicone rubber. The gravity ball 11 is made of polypropylene, and the sealing layer 15 is made of silicone. The annular guide groove 12 is made of medical-grade stainless steel. Specific implementation example:

[0026] After abdominal surgery, the drainage bag with the anti-backflow structure is used on the patient. Medical staff clean and disinfect their hands, check whether the packaging is intact, undamaged, and expired. After opening the packaging, check again whether there are any abnormalities in the various devices and whether the connections are tight. The drainage bag with the anti-backflow structure is hung vertically and upright. When hanging, ensure that the position of the drainage bag 3 is lower than the patient's drainage site. Seal the male connector 32 of the drainage device and insert the male connector 32 into the female connector 33. The groove of the male connector 32 is engaged with the buckle ring to achieve a quick and sealed connection with the drainage tube 18. Connect the negative pressure interface of the drainage device to the hospital's central negative pressure through a hose. The other end of the drainage device is inserted into the abdominal cavity through the abdominal incision. Medical staff open the negative pressure switch to perform drainage. During normal drainage, as the fluid in the abdominal cavity enters the inlet channel 17 through the drainage tube 18, the elastic diaphragm 6 slides downward along the guide post 5 due to the gravity of the drainage fluid. The gravity ball 11 rolls to the lowest end of the annular guide groove 12, and the duckbill valve 30 automatically opens, forming a passage in the inlet channel 17. The fluid in the patient's abdominal cavity is slowly drained into the drainage bag 3. The amount of drainage fluid can be recorded and displayed according to the capacity scale 19 on both sides of the drainage bag 3. After reaching the preset capacity, the control valve 25 of the drainage channel 24 is opened to discharge the fluid in the drainage bag 3 into the waste fluid collection container. The control valve 25 is closed, and the drainage bag 3 can continue to be used, or the drainage can be paused. Then, push the sliding sleeve to compress the buckle ring. The buckle ring separates from the groove, and the male head 32 and female head 33 are unlocked. Pull out the male head 32, replace with a new drainage bag, and continue drainage. During drainage, if the patient's position changes, coughs, the drainage bag 3 tilts, or external pressure fluctuates, the internal pressure of the drainage bag 3 increases. The drainage bag with an anti-backflow structure then activates its triple anti-backflow function: the duckbill valve 30 automatically closes; the gravity ball 11, due to its lower density than the liquid, rolls upward through the annular guide groove 12 under buoyancy, compressing the elastic diaphragm 6 to enhance the seal; simultaneously, the elastic diaphragm 6, under the upward pressure of the gravity ball 11 and the liquid, moves upward along the guide post 5. The elastic diaphragm 6 and the frustum-shaped cavity 7 form a seal. The inner diameter of the frustum-shaped cavity 7 decreases towards the top, and the upward pressure on the elastic diaphragm 6 increases. The better the sealing performance of the cavity 7, the more stable, reliable and safe the anti-backflow structure is formed by the anti-backflow valve 1, gravity triggering unit 2 and duckbill valve 30, which enhances the anti-backflow performance of the drainage bag 3. During the drainage process, the risk of infection for the patient is minimized. When the pressure inside the drainage bag 3 decreases to a normal level, the elastic diaphragm 6 slides down along the guide column 5 under the action of the gravity of the drainage liquid itself. The gravity ball 11 rolls to the lower end of the annular guide groove 12, the duckbill valve 30 opens automatically, the inlet channel 17 forms a passage, and continues to drain into the drainage bag 3. The through groove 16 releases the liquid in the annular guide groove 12 to prevent the liquid in the annular guide groove 12 from hindering the normal operation of the gravity ball 11. The exhaust channel 20 and the negative pressure balance channel 26 together form a dual protection structure. During the drainage process, they simultaneously maintain the normal air pressure balance inside the drainage bag 3 and cope with unexpected extreme air pressure fluctuations, achieving the purpose of dual protection for drainage safety. When the pressure inside the drainage bag 3 is high, the exhaust channel 20 maintains the pressure balance between the inside and outside of the drainage bag 3, and discharges the gas inside the drainage bag 3 through the double-layer filter device 21 in real time, ensuring smooth drainage. The hydrophobic and breathable membrane I 22 of the double-layer filter device 21 has selective filtration characteristics, which can prevent liquid from passing through while maintaining unobstructed gas flow. Polypropylene meltblown antibacterial... Layer 23 sterilizes the discharged gas to reduce the risk of contamination. The negative pressure regulating valve 27 has a suitable negative pressure preset threshold. When an extreme air pressure fluctuation occurs and the negative pressure in the drainage bag 3 exceeds the set value, the negative pressure regulating valve 27 automatically opens. Outside air enters the drainage bag 3 through the hydrophobic and breathable membrane II 29, the one-way ventilation valve 28, and the drainage tube 18 to balance the negative pressure inside the bag, effectively preventing the risk of backflow or damage to the patient. The hydrophobic and breathable membrane II 29 and the one-way ventilation valve 28 ensure unobstructed outside airflow while preventing liquid backflow when the negative pressure regulating valve 27 is open.

Claims

1. A drainage bag with an anti-backflow structure, comprising an anti-backflow valve (1), a gravity triggering unit (2), and a drainage bag (3), characterized in that, The anti-backflow valve (1) includes a valve body (4), a guide post (5), and an elastic diaphragm (6). The valve body (4) has a frustum-shaped cavity (7) inside. The central axis of the frustum-shaped cavity (7) is located on the central axis of the valve body (4). The opening at the upper end of the frustum-shaped cavity (7) is set as an inlet (8), and the opening at the lower end of the frustum-shaped cavity (7) is set as an outlet (9). The diameter of the inlet (8) is smaller than the diameter of the outlet (9). The guide post (5) is located along the entire length of the central axis of the frustum-shaped cavity (7). The two ends of the guide post (5) are fixedly connected to the two ends of the valve body (4) by support frames (10) respectively. The guide post (5) is slidably fitted with an elastic diaphragm (6). The central axis of the elastic diaphragm (6) is located on the central axis of the guide post (5). The diameter of the elastic diaphragm (6) matches the inner diameter of the outlet (9). The gravity triggering unit (2) includes a gravity ball (11), an annular guide groove (12), and a housing (13). The annular guide groove (12) is located at the center of the housing (13). The two ends of the annular guide groove (12) are symmetrically fixed to the two sides of the upper end of the housing (13) by a support frame (10). The annular guide groove (12) is configured as an upward-opening groove (14). The gravity ball (11) is rolled around in the groove (14). The shape of the groove (14) is similar to that of the gravity ball (11). The shape of the groove (14) is matched, the height of the groove (14) is less than the diameter of the gravity ball (11), the height of the groove (14) is greater than the radius of the gravity ball (11), the gravity ball (11) is set as an internal hollow structure, the surface of the gravity ball (11) is provided with a sealing layer (15), the density of the gravity ball (11) is less than the density of the drainage liquid, and a through groove (16) is opened at the lower end of the annular guide groove (12), the length of the through groove (16) is greater than the diameter of the gravity ball (11); The drainage bag (3) is configured as a rectangular bag structure. An inlet channel (17) is provided at the middle position of the top of the drainage bag (3). The top of the inlet channel (17) is connected to a drainage tube (18). A capacity scale (19) is provided on both sides of the drainage bag (3). An exhaust channel (20) is provided on one side of the top of the drainage bag (3). A double-layer filter device (21) is provided at the upper port of the exhaust channel (20). The inner layer of the double-layer filter device (21) is configured as a hydrophobic and breathable membrane I (22). The outer layer of the double-layer filter device (21) is configured as a polypropylene meltblown antibacterial layer (23). A drain channel (24) is provided at the center of the bottom of the drainage bag (3). A control valve (25) is provided at the lower port of the drain channel (24).

2. A drainage bag with an anti-backflow structure as described in claim 1, characterized in that, It also includes a negative pressure balance channel (26), which includes a negative pressure regulating valve (27), a one-way vent valve (28) and a hydrophobic and breathable membrane II (29). The negative pressure balance channel (26) is located on the side wall of the drainage tube (18). A one-way vent valve (28) is provided at the other end of the negative pressure balance channel (26). A hydrophobic and breathable membrane II (29) is provided inside the one-way vent valve (28). A negative pressure regulating valve (27) is provided on the side of the negative pressure balance channel (26).

3. A drainage bag with an anti-backflow structure as described in claim 1, characterized in that, The anti-backflow valve (1) and gravity triggering unit (2) are located in the liquid inlet channel (17). The outer diameter of the valve body (4) and the housing (13) is equal to the inner diameter of the liquid inlet channel (17). The lower end of the anti-backflow valve (1) is fixedly connected to the upper end of the gravity triggering unit (2). The liquid inlet channel (17), anti-backflow valve (1), gravity triggering unit (2), exhaust channel (20), drainage channel (24), drainage bag (3), drainage pipe (18) and negative pressure balance channel (26) are set as an integral molding structure.

4. A drainage bag with an anti-backflow structure as described in claim 3, characterized in that, It also includes a duckbill valve (30), the inlet of which is connected to the lower port of the gravity triggering unit (2).

5. A drainage bag with an anti-backflow structure as described in claim 1, characterized in that, It also includes a push-pull snap-fit ​​connector (31), which includes a male head (32) and a female head (33). The male head (32) is sealed to the drainage device, and the female head (33) is sealed to the other end of the drainage tube. The male head (32) and the female head (33) achieve quick connection and unlocking through a sliding sleeve, a snap ring and a groove.

6. A drainage bag with an anti-backflow structure as described in claim 1, characterized in that, The drainage bag (3) is made of soft, transparent medical-grade PVC material; The elastic diaphragm (6) is made of medical-grade silicone rubber. The gravity ball (11) is made of polypropylene, and the sealing layer (15) is made of silicone. The annular guide groove (12) is made of medical-grade stainless steel.

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