Urinary surgery closed drainage bag based on cycle shunt anti-reflux

Abstract

The application provides a urinary surgery closed drainage bag based on circulation shunt anti-reflux, and relates to the technical field of drainage bags, which comprises a drainage bag body and a drainage cannula, a primary retention cavity, a secondary retention cavity and a negative pressure cavity are arranged in the drainage bag body, a negative pressure ball is arranged in the negative pressure cavity, a drainage butt joint pipe, a first cannula module, a second cannula module, a third through pipe and a fourth through pipe are heat-sealedly connected to the outside of the drainage bag body, the primary retention cavity and the secondary retention cavity are connected through the fourth through pipe, and the secondary retention cavity and the negative pressure cavity are connected through the third through pipe. The technical scheme is characterized in that the liquid in the set drainage time period is separated in the primary retention cavity, and the liquid in the primary retention cavity can be circulated and drained into the secondary retention cavity, so that the liquid in the primary retention cavity is transferred in sections, and the drainage volume and state of the liquid in the primary retention cavity in the set period are conveniently observed and recorded.

Description

Technical Field

[0001] This invention relates to the field of drainage bag technology, and in particular to a urological closed drainage bag based on circulatory diversion to prevent reflux. Background Technology

[0002] In the field of medical surgery, the purpose of drainage is to remove harmful substances from the body in a timely manner, reduce pressure to eliminate dead space, change the biological environment of the infected site, and reduce inflammatory response. Drainage bags are used externally, and contaminated fluid is pumped into the drainage bag through the drainage channel by an external negative pressure source to promote wound healing.

[0003] Currently, existing closed drainage bags can isolate the internal and external environments of the drainage bag and prevent contamination. However, in order to make efficient use of resources, closed drainage bags are usually replaced after being filled or after 24 hours. The drainage fluid from multiple time periods is mixed in the bag, which is not conducive to calculating the drainage volume and drainage fluid status in a short period of time, and thus not conducive to the diagnosis of the disease. Therefore, this invention proposes a urological closed drainage bag based on circulation diversion to prevent reflux. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as closed drainage bags being typically filled or replaced after 24 hours, resulting in the mixing of drainage fluids from multiple time periods within the bag. This makes it difficult to observe and calculate the drainage volume and fluid status over short periods, which is detrimental to disease diagnosis.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a urological closed drainage bag based on circulatory shunt to prevent reflux, comprising a drainage bag body and a drainage cannula. The drainage bag body internally comprises a primary retention chamber, a secondary retention chamber, and a negative pressure chamber. The negative pressure chamber contains a negative pressure bulb. The external surface of the drainage bag body is thermally connected to a drainage connecting tube, a first cannula module, a second cannula module, a third cannula, and a fourth cannula. The primary and secondary retention chambers are connected via the fourth cannula, and the secondary retention chamber and the negative pressure chamber are connected via the third cannula. The drainage cannula... The top of the tube is sealed and inserted into the drainage connecting tube; the first insertion module includes: a first tube connecting the primary retention chamber and the secondary retention chamber; a flat tube connecting the bottom of the primary retention chamber; and a sample aspiration bottle connecting one end of the flat tube; the second insertion module includes: a second tube connecting the negative pressure chamber and the primary retention chamber; and an extension tube connecting the second tube; the top of the primary and secondary retention chambers are each provided with a fan-shaped air-storing shell, and the drainage bag body is provided with an air-sealing clamp on the outside, which is used to clamp and seal the first tube, the second tube, the extension tube, and the fourth tube.

[0006] In at least some embodiments, one-way valves are provided on the drainage cannula, the second cannula, the third cannula, and the fourth cannula. The one-way valve on the drainage cannula is used to restrict the unidirectional flow of liquid in the drainage cannula to the drainage connecting pipe. The one-way valve on the second cannula is used to restrict the unidirectional flow of gas in the negative pressure chamber to the primary retention chamber and the extension tube. The one-way valve on the third cannula is used to restrict the unidirectional flow of gas in the secondary retention chamber to the negative pressure chamber.

[0007] In at least some embodiments, the drainage cannula and the drainage connector are movably engaged by a connecting block, the connecting block comprising: a male snap fastener fixed to the bottom end of the drainage cannula; a female snap fastener fixed to the top end of the drainage connector, the male snap fastener being able to snap into the inside of the female snap fastener; and a sealing gasket installed on the inner bottom wall of the female snap fastener; the drainage cannula is able to be sealed and inserted into the drainage connector through the male and female snap fasteners.

[0008] In at least some embodiments, the top of the front side of the fan-shaped gas storage shell is provided with an opening opposite to the No. 4 passage pipe, and the fan-shaped gas storage shell located inside the secondary retention chamber is provided with a notch opposite to the No. 3 passage pipe.

[0009] In at least some embodiments, the flat tube has at least two movable seals inside, and a dotted line is provided on the outer wall of the flat tube between the two movable seals to guide the cutting of the flat tube for use.

[0010] In at least some embodiments, a rubber stopper is interference-fitted at the opening of the flat tube that connects to the primary retention cavity.

[0011] In at least some embodiments, an air-permeable water-blocking device is provided in the second conduit.

[0012] In at least some embodiments, the primary retention cavity and the secondary retention cavity are provided with heat-sealing limiting areas, which are formed by heat-sealing the two side walls of the drainage bag body at the heat-sealing limiting areas.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0014] 1. In this invention, the liquid within the set drainage time period is divided into a primary retention chamber, and the liquid in the primary retention chamber can be circulated and drained into a secondary retention chamber. The liquid in the primary retention chamber is transferred in segments, which facilitates observation and recording of the drainage volume and status of the liquid in the primary retention chamber within the set time period.

[0015] 2. In this invention, when transferring the liquid in the primary retention chamber, air can be added to the secondary retention chamber to assist in the discharge of the liquid in the primary retention chamber, ensuring thorough drainage and effective separation from the drainage liquid in the next time period.

[0016] 3. In this invention, negative pressure is generated in the negative pressure chamber to extract air from the secondary retention chamber, thereby expending excess gas as much as possible and effectively utilizing the capacity of the drainage bag.

[0017] 4. In this invention, the sample aspiration bottle can aspirate liquid samples from the primary retention chamber after the movable seals on both sides of the flat tube are opened by squeezing. After completion, the movable seals are fastened, and the flat tube is cut between the two movable seals to obtain the test sample, making sampling and testing convenient.

[0018] 5. In this invention, the drainage bag has a simple structure and low manufacturing cost. Attached Figure Description

[0019] Figure 1 This invention presents a schematic diagram of a closed drainage bag for urology based on circulatory diversion to prevent reflux.

[0020] Figure 2 An exploded view of the connecting block in a urological closed drainage bag based on circulatory diversion and anti-reflux is provided for this invention;

[0021] Figure 3 An exploded view of a fan-shaped air-storing shell in a urological closed drainage bag based on circulatory diversion and anti-reflux is presented for this invention.

[0022] Legend: 1. Drainage bag body; 11. Primary retention chamber; 12. Secondary retention chamber; 13. Negative pressure chamber; 14. Negative pressure bulb;

[0023] 2. Drainage cannula; 21. Drainage connector;

[0024] 22. Connecting block; 2201. Male thread; 2202. Female thread; 2203. Sealing gasket;

[0025] 3. No. 1 cannulation module; 31. No. 1 connecting tube; 32. Flat tube; 33. Movable seal;

[0026] 4. No. 2 insertion module; 41. No. 2 connecting pipe; 42. Extension pipe;

[0027] 5. Sample aspiration bottle;

[0028] 6. Pipe No. 3;

[0029] 7. Pipe No. 4;

[0030] 8. Fan-shaped gas storage shell;

[0031] 81. Heat-sealed limiting area;

[0032] 9. Breath-holding clamp. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0034] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0035] In the use of closed drainage bags in urology, these bags are typically used only once within 24 hours. During these 24 hours, the drainage fluid from the beginning, middle, and end of the drainage period mixes together in the bag. In the middle and end of the period, the drainage fluid is mixed together, making it difficult to observe and record the drainage volume and condition within each time period, which can easily interfere with the diagnosis. Furthermore, sampling and testing of the drainage fluid usually involves emptying the fluid after replacing the drainage bag, which is cumbersome, and the mixing of drainage fluid from multiple time periods negatively impacts the accuracy of the tests.

[0036] The drainage fluid within a set time period is divided into primary retention chamber 11. After observing and recording the drainage volume and status of the drainage fluid within the set time period, air from secondary retention chamber 12 is added to primary retention chamber 11. By controlling the first cannula module 3 to connect the bottom of primary retention chamber 11 to the top of secondary retention chamber 12, the drainage fluid is drained into secondary retention chamber 12 for accumulation, ensuring thorough drainage and facilitating the recording of the drainage fluid status and volume within the next set time period. When sampling and testing of drainage fluid within a certain set time period is required, the sample aspiration bottle 5 is squeezed to expel the gas through the flat tube 32, and the drainage fluid divided in primary retention chamber 11 is extracted. After sealing the flat tube 32, it is cut to obtain the drainage fluid sample for this period. The operation is simple and does not affect the subsequent use of the drainage bag body 1.

[0037] In this embodiment, a time period of six hours is defined during the negative pressure drainage process.

[0038] Implementation examples, based on Figure 1 - Figure 3 ,like Figure 1As shown in the figure, an embodiment of the present invention provides a urological closed drainage bag based on circulatory shunt to prevent reflux, comprising a drainage bag body 1 and a drainage cannula 2. The drainage bag body 1 is internally provided with a primary retention chamber 11, a secondary retention chamber 12 and a negative pressure chamber 13. The negative pressure chamber 13 is internally provided with a negative pressure bulb 14. The external of the drainage bag body 1 is thermally connected to a drainage connecting tube 21, a first cannula module 3, a second cannula module 4, a third cannula 6 and a fourth cannula 7. The primary retention chamber 11 and the secondary retention chamber 12 are connected through the fourth cannula 7. The secondary retention chamber 12 and the negative pressure chamber 13 are connected by a No. 3 connecting tube 6, and the top of the drainage cannula 2 is sealed and inserted into the drainage connecting tube 21; the first cannula module 3 includes: a No. 1 connecting tube 31 connecting the primary retention chamber 11 and the secondary retention chamber 12; a flat tube 32 connecting the bottom end of the primary retention chamber 11; and a sample aspiration bottle 5 connecting one end of the flat tube 32; the second cannula module 4 includes: a No. 2 connecting tube 41 connecting the negative pressure chamber 13 and the primary retention chamber 11; and an extension tube 42 connecting the No. 2 connecting tube 41; as Figure 1 and Figure 3 In this system, a fan-shaped air-storing shell 8 is provided at the top of the interior of both the primary retention chamber 11 and the secondary retention chamber 12. An air-sealing clamp 9 is provided on the exterior of the drainage bag body 1. The air-sealing clamp 9 is used to clamp and seal the first connecting tube 31, the second connecting tube 41, the extension tube 42, and the fourth connecting tube 7. After the drainage tube 2 is inserted into the drainage connecting tube 21, the end of the second connecting tube 41 near the primary retention chamber 11 is sealed, the extension tube 42 remains unobstructed, and the first connecting tube 31 is sealed. By squeezing the negative pressure ball 14, the primary retention chamber 11 and the secondary retention chamber 12 are connected through the fourth connecting tube 7, thereby drawing the air inside the primary retention chamber 11 and the secondary retention chamber 12 to the outside. The fan-shaped air-storing shell 8 undergoes slight external deformation under the influence of negative pressure in the primary retention chamber 11 and the secondary retention chamber 12, while remaining hollow inside. It can drain the liquid inside the drainage tube 2 under negative pressure and allow it to flow to the primary retention chamber. At the bottom of the primary retention chamber 11, the secondary retention chamber 12 is connected to the fan-shaped gas storage shell 8 in the primary retention chamber 11 via the No. 4 pipe 7. The hollow space formed inside allows the drainage liquid in the primary retention chamber 11 to preferentially accumulate at the bottom under the action of gravity, which can prevent the liquid in the primary retention chamber 11 from flowing into the secondary retention chamber 12 through the No. 4 pipe 7. This effectively separates the liquid in the primary retention chamber 11 and the secondary retention chamber 12, making it easier to observe and record the drainage liquid status within a set period. After the No. 1 pipe 31 is unobstructed, since the primary retention chamber 11 and the secondary retention chamber 12 are connected through the No. 4 pipe 7, the liquid at the bottom of the primary retention chamber 11 flows into the secondary retention chamber 12 through the No. 1 pipe 31, and replaces the air in the secondary retention chamber 12 in equal amount through the No. 4 pipe 7 to balance the air pressure in the primary retention chamber 11 and the secondary retention chamber 12.

[0039] If the primary retention chamber 11 is shriveled and contains a large amount of residual liquid, then close the No. 4 tube 7 and the No. 1 tube 31, close the extension tube 42, and keep the No. 2 tube 41 open. Press the negative pressure ball 14 to pump air from the secondary retention chamber 12 into the primary retention chamber 11, thus inflating the primary retention chamber 11 to eliminate the shriveled portion. This causes the residual liquid to collect at the bottom of the primary retention chamber 11, keeping the No. 1 tube 31 open. After first emptying the residual liquid collected at the bottom of the primary retention chamber 11, the primary retention chamber 11 is then opened through the No. 1 tube... Air is discharged from tube 31 to the secondary retention chamber 12 to balance the air pressure inside the primary retention chamber 11 and the secondary retention chamber 12. If the negative pressure drainage power is insufficient at this time, the fourth tube 7 can be opened, the end of the second tube 41 near the primary retention chamber 11 can be closed, the extension tube 42 can be opened, the negative pressure ball 14 can be pressed to extract the excess air inside the secondary retention chamber 12 and the primary retention chamber 11, and discharge it through the extension tube 42, thereby increasing the power of negative pressure drainage of the liquid in the drainage tube 2. The structure is simple, the manufacturing cost is low, and the internal capacity of the secondary retention chamber 12 is effectively utilized.

[0040] One-way valves are installed on the drainage cannula 2, the second connecting pipe 41, the third connecting pipe 6, and the fourth connecting pipe 7. The one-way valve on the drainage cannula 2 is used to restrict the unidirectional flow of liquid in the drainage cannula 2 to the drainage connecting pipe 21. The one-way valve on the second connecting pipe 41 is used to restrict the unidirectional flow of gas in the negative pressure chamber 13 to the primary retention chamber 11 and the extension pipe 42. The one-way valve on the third connecting pipe 6 is used to restrict the unidirectional flow of gas in the secondary retention chamber 12 to the negative pressure chamber 13. A gas-permeable water-blocking device is installed in the second connecting pipe 41 to prevent the liquid inside the secondary retention chamber 12 from leaking to the outside through the third connecting pipe 6, the negative pressure chamber 13, the second connecting pipe 41, and the extension pipe 42.

[0041] like Figure 2 In this connection, the drainage cannula 2 and the drainage connector 21 are movably connected by a docking block 22. The docking block 22 includes: a male buckle 2201 fixed to the bottom end of the drainage cannula 2; a female buckle 2202 fixed to the top end of the drainage connector 21, wherein the male buckle 2201 can be engaged inside the female buckle 2202; and a sealing gasket 2203 installed on the inner bottom wall of the female buckle 2202. The drainage cannula 2 can be sealed and inserted into the drainage connector 21 through the male buckle 2201 and the female buckle 2202, simplifying the docking and disassembly operations of the drainage cannula 2 and the drainage connector 21, and maintaining a certain sealing effect.

[0042] like Figure 3In this configuration, the top of the front of the fan-shaped gas storage shell 8 is provided with an opening opposite to the No. 4 connecting pipe 7. Inside the secondary retention chamber 12, the fan-shaped gas storage shell 8 has a notch opposite to the No. 3 connecting pipe 6, allowing both ends of the No. 4 connecting pipe 7 to communicate with the hollow portion inside the fan-shaped gas storage shell 8 through the opening. The negative pressure chamber 13 preferentially draws air from the hollow portion of the fan-shaped gas storage shell 8 through the No. 3 connecting pipe 6. The primary retention chamber 11 and the secondary retention chamber 12 are provided with heat-sealing limiting areas 81, formed by heat-sealing the two side walls of the drainage bag body 1 at the heat-sealing limiting areas 81. This limits the fan-shaped gas storage shell 8, keeping it in the upper part inside the primary retention chamber 11 and the secondary retention chamber 12, while the opening on the fan-shaped gas storage shell 8 remains aligned with the No. 4 connecting pipe 7. Figure 1 In this design, the flat tube 32 has at least two movable seals 33 inside. A dotted line is provided on the outer wall of the flat tube 32 between the two movable seals 33 to guide the cutting of the flat tube 32. The flat tube 32 is a flat pipe and is sealed by the movable seals 33. The at least two movable seals 33 are used to divide the flat tube 32 into multiple sealed sections. Squeezing both sides of the flat tube 32 opens the movable seals 33, allowing the sample aspiration bottle 5 to connect with the primary retention chamber 11 through the flat tube 32. Squeezing the sample aspiration bottle 5 expels air into the primary retention chamber 11 through the flat tube 32, and the sample aspiration bottle 5 is then restored to its original position to extract the primary retention fluid. After sampling, the liquid inside cavity 11 is resealed by pinching the movable seal 33 from the outside of the flat tube 32. Between the two movable seals 33, the flat tube 32 can be cut and the sample aspiration bottle 5 can be directly removed. The flat tube 32 is sealed by the movable seal 33, thus preventing leakage from both sections of the flat tube 32. The opening of the flat tube 32 connected to the primary retention cavity 11 is fitted with a rubber stopper to prevent the end of the flat tube 32 connected to the primary retention cavity 11 from being mixed with drainage liquid from other periods when no sample is taken. When the sample aspiration bottle 5 is squeezed to expel excess gas through the flat tube 32 into the primary retention cavity 11, the rubber stopper can be squeezed out.

[0043] When using the drainage bag body 1, the first tube 31 remains clamped and closed. The drainage insertion tube 2 is connected to the drainage connecting tube 21 via the docking block 22. The air-tight clamp 9 is used to clamp the end of the second tube 41 near the primary retention chamber 11. The fourth tube 7 is open. When the negative pressure bulb 14 is squeezed, most of the gas in the primary retention chamber 11 and the secondary retention chamber 12 is drawn out through the third tube 6 and the fourth tube 7 and discharged through the second tube 41 and the extension tube 42. Finally, the negative pressure bulb 14 is pressed into a flattened state to be restored. Then, the extension tube 42 is clamped by the air-tight clamp 9. The air-tight clamp 9 on the second tube 41 is removed, and the negative pressure bulb 14 is released. The secondary retention chamber 12 and the extension tube 42 are then closed. The primary retention chamber 11 is maintained under negative pressure. The contaminated fluid is drained into the primary retention chamber 11 through the drainage tube 2. Since the first tube 31 is closed, the fan-shaped air-storage shell 8 at the top of the primary retention chamber 11 and the secondary retention chamber 12 creates a small negative pressure space. The two ends of the fourth tube 7 are connected to the top of the negative pressure space. The drainage connecting tube 21 is inserted into the bottom of the primary retention chamber 11, so that the drainage fluid is preferentially accumulated at the bottom of the primary retention chamber 11. After a period of time, the doctor can read the drainage volume and color status of the drainage fluid by observing the fluid height in the primary retention chamber 11 and the external scale markings of the primary retention chamber 11, and record it for easy diagnosis.

[0044] After recording, remove the air-sealing clamp 9 from tube 31, connecting the primary retention chamber 11 to the secondary retention chamber 12 via tube 7 and tube 31. Liquid in the primary retention chamber 11 flows through tube 31 to the secondary retention chamber 12. Then, clamp and seal tube 7 and tube 31 with the air-sealing clamp 9, squeezing the negative pressure ball 14 to deform in the negative pressure chamber 13. Air drawn from the secondary retention chamber 12 via tube 6 is released into the primary retention chamber 11 through tube 41, opening the primary retention chamber 11. This prevents a large amount of drainage liquid from the previous period from remaining in the drainage bag body 1 when the negative pressure inside is flattened. After opening, liquid collects at the bottom of the primary retention chamber 11. Remove the air-sealing clamp 9 from tube 31 and wait... The residual liquid enters the secondary retention chamber 12. After the air pressure in the primary retention chamber 11 and the secondary retention chamber 12 is balanced, the first tube 31 is clamped and sealed again. The air-sealing clamp 9 on the fourth tube 7 is removed to connect the fourth tube 7. The air-sealing clamp 9 is clamped on the end of the second tube 41 near the primary retention chamber 11 and the air-sealing clamp 9 on the extension tube 42 is removed. After the negative pressure ball 14 is squeezed to discharge the gas through the extension tube 42, the air-sealing clamp 9 is clamped and sealed again. During the reduction stage of the negative pressure ball 14, the air inside the secondary retention chamber 12 is extracted through the third tube 6. The secondary retention chamber 12 is connected to the primary retention chamber 11 through the fourth tube 7. The air pressure is balanced and in a negative pressure state. Thus, the contaminated liquid is drained through the drainage connector 21 and the drainage insertion tube 2, and the second liquid drainage period begins.

[0045] During the later periods of the 24-hour period, the fluid in the primary retention chamber 11 can be circulated and drained into the secondary retention chamber 12. The fluid retained in the primary retention chamber 11 can be transferred in segments according to different time periods, effectively separating the drainage fluid in different time periods for easy observation and recording, which is beneficial for disease diagnosis.

[0046] In this embodiment, when it is necessary to obtain a test sample for one time period, the movable seals 33 inside the flat tube 32 are separated by squeezing both sides of the flat tube 32. After opening the two movable seals 33, the interior of the flat tube 32 is connected to the sample aspiration bottle 5. After squeezing the sample aspiration bottle 5 to expel air, the sample aspiration bottle 5 extracts the drainage liquid at the end of the flat tube 32 through the flat tube 32 during the restoration process. The drainage liquid separated by the primary retention chamber 11 during this time period is extracted. Then, along the closing direction of the movable seals 33, the movable seals 33 inside the flat tube 32 are pinched together, thereby keeping the flat tube 32 closed. After cutting the flat tube 32 along the dotted line mark between the two movable seals 33, the test sample can be obtained directly. The test sample is not mixed with the drainage liquid from other time periods, which improves the accuracy of the test.

[0047] In this embodiment, the second tube 41 is clamped and sealed near the first-stage retention chamber 11 by the air-sealing clamp 9. After opening the air-sealing clamp 9 on the extension tube 42 to make the extension tube 42 unobstructed, the excess gas in the second-stage retention chamber 12 is discharged by pressing the negative pressure ball 14. Most of the air in the second-stage retention chamber 12 can be discharged, so that the second-stage retention chamber 12 is filled with drainage liquid as much as possible, making reasonable use of the storage space of the second-stage retention chamber 12. When the second-stage retention chamber 12 is full or the drainage bag body 1 needs to be replaced after 24 hours of use, the bottom end of the drainage tube 2 is clamped and sealed by the air-sealing clamp 9. The docking block 22 is rotated to separate the male buckle 2201 and the female buckle 2202, and a new drainage bag body 1 can be replaced. The replaced drainage bag body 1 is then fastened with the male buckle 2201 and the female buckle 2202. Then the operation of using the drainage bag body 1 is repeated to complete the replacement of the drainage bag body 1.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A closed drainage bag for urology based on circulatory shunt to prevent reflux, comprising a drainage bag body (1) and a drainage cannula (2), characterized in that: The drainage bag body (1) is provided with a primary retention chamber (11), a secondary retention chamber (12) and a negative pressure chamber (13) inside. The negative pressure chamber (13) is provided with a negative pressure ball (14). The drainage bag body (1) is externally heat-sealed with a drainage connector (21), a first insertion module (3), a second insertion module (4), a third passage (6) and a fourth passage (7). The primary retention chamber (11) and the secondary retention chamber (12) are connected through the fourth passage (7). The secondary retention chamber (12) and the negative pressure chamber (13) are connected through the third passage (6). The top of the drainage tube (2) is sealed and inserted into the drainage connector (21). The first cannulation module (3) includes: A first conduit (31) connects the primary retention chamber (11) and the secondary retention chamber (12); A flat tube (32) connected to the bottom end of the primary retention chamber (11); A sample aspiration bottle (5) is connected to one end of a flat tube (32); The second cannulation module (4) includes: A second conduit (41) connects the negative pressure chamber (13) and the primary retention chamber (11); The extension pipe (42) is connected to the second conduit (41); The top of the primary retention chamber (11) and the secondary retention chamber (12) are both provided with a fan-shaped air storage shell (8), and the outside of the drainage bag body (1) is provided with an air-sealing clamp (9). The air-sealing clamp (9) is used to clamp and seal the No. 1 tube (31), the No. 2 tube (41), the extension tube (42) and the No. 4 tube (7).

2. A urological closed drainage bag based on circulatory shunt to prevent reflux as described in claim 1, characterized in that: One-way valves are provided on the drainage tube (2), the second connecting tube (41), the third connecting tube (6), and the fourth connecting tube (7). The one-way valve on the drainage tube (2) is used to restrict the liquid in the drainage tube (2) from flowing unidirectionally to the drainage connecting tube (21). The one-way valve on the second connecting tube (41) is used to restrict the gas in the negative pressure chamber (13) from flowing unidirectionally to the primary retention chamber (11) and the extension tube (42). The one-way valve on the third connecting tube (6) is used to restrict the gas in the secondary retention chamber (12) from flowing unidirectionally to the negative pressure chamber (13).

3. A urological closed drainage bag based on circulatory shunt to prevent reflux as described in claim 1, characterized in that: The drainage cannula (2) and the drainage connecting tube (21) are movably connected by a connecting block (22), the connecting block (22) comprising: The male thread (2201) is fixed to the bottom end of the drainage cannula (2); The female buckle (2202) is fixed to the top of the drain connector (21), and the male buckle (2201) can be snapped into the inside of the female buckle (2202); A sealing gasket (2203) is installed on the inner bottom wall of the female buckle (2202); The drainage cannula (2) can be sealed and inserted into the drainage connector (21) through the male thread (2201) and the female thread (2202).

4. A urological closed drainage bag based on circulatory shunt to prevent reflux as described in claim 1, characterized in that: The top of the front of the fan-shaped gas storage shell (8) is provided with an opening opposite to the No. 4 pipe (7), and the fan-shaped gas storage shell (8) located inside the secondary retention cavity (12) is provided with a notch opposite to the No. 3 pipe (6).

5. A urological closed drainage bag based on circulatory shunt to prevent reflux as described in claim 1, characterized in that: The flat tube (32) has at least two movable seals (33) inside. A dotted line is provided on the outer wall of the flat tube (32) between the two movable seals (33) to guide the cutting of the flat tube (32) for use.

6. A urological closed drainage bag based on circulatory shunt to prevent reflux as described in claim 5, characterized in that: A rubber stopper is fitted at the opening where the flat tube (32) connects to the primary retention chamber (11).

7. A urological closed drainage bag based on circulatory shunt to prevent reflux as described in claim 1, characterized in that: An air-permeable water-blocking device is installed in the second pipe (41).

8. A urological closed drainage bag based on circulatory shunt to prevent reflux as described in claim 1, characterized in that: The primary retention cavity (11) and the secondary retention cavity (12) are provided with heat-sealing limiting areas (81), which are made by heat-sealing the two side walls of the drainage bag body (1) at the heat-sealing limiting areas (81).

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