Precision drainage bag

Abstract

The present application provides a precision drainage bag, comprising a drainage connecting pipe, a precision metering drainage box and a liquid gathering drainage bag which are sequentially communicated; the precision metering drainage box and the liquid gathering drainage bag are detachably fixed on the upper part of the adjacent side walls; the lower end of the precision metering drainage box is provided with a box liquid outlet, and the upper side wall is provided with an air inlet; the liquid inlet of the liquid gathering drainage bag is arranged close to the upper side, the liquid inlet is lower than the outlet of the drainage connecting pipe, and a connecting hose is arranged to connect the box liquid outlet and the liquid inlet; the precision metering drainage box is used for accurately judging the instantaneous drainage speed and the total drainage amount during general surgery drainage; the upper side wall of the precision metering drainage box is provided with an air inlet and a water seal exhaust pipe, which are used for accurately judging the instantaneous drainage speed and the total drainage amount during thoracic cavity gas-liquid drainage, accurately judging the gas drainage condition, and facilitating early ambulation of the patient, rapid recovery, simple structure, low cost and easy popularization.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to precision drainage bags. Background Technology

[0002] Drainage is extremely important in medicine, used to remove abnormal fluids or gases from cavities, avoid pressure on surrounding tissues, reduce the risk of infection, and promote recovery.

[0003] Currently, drainage devices make it difficult to accurately determine the real-time drainage rate, especially in thoracic surgery. The water-seal bottles used for drainage are large in size and weight, which is not conducive to patients getting out of bed early after surgery and is not in line with the concept of rapid recovery.

[0004] There is an urgent clinical need for a drainage bag that is inexpensive, lightweight, and can accurately measure the instantaneous drainage rate, so as to facilitate the immediate assessment and treatment of changes in the drainage condition; it also benefits patients by allowing them to get out of bed early after surgery and recover quickly. Summary of the Invention

[0005] To address the aforementioned deficiencies in the prior art, the present invention provides a precision drainage bag comprising a drainage connecting tube, a rigid precision metering drainage box, a connecting hose, and a liquid-aggregating drainage bag connected in sequence; the volume of the precision metering drainage box is smaller than that of the liquid-aggregating drainage bag, and the upper part of the adjacent sidewalls of the precision metering drainage box and the liquid-aggregating drainage bag are detachably fixed.

[0006] The precision metering drainage box has a liquid outlet at the lower end and an air inlet at the upper end; the liquid collection drainage bag has a liquid inlet near the upper side, and the liquid outlet of the box is lower than the liquid inlet of the bag and lower than the connection port of the drainage connecting pipe in the precision metering drainage box; the connecting hose connects the liquid outlet of the box and the liquid inlet of the bag.

[0007] Furthermore, the precision metering drainage box is an elastic box body, and the drainage connecting pipe is provided with a one-way membrane at the communication port of the precision metering drainage box; the air inlet is provided with a matching cap, and the liquid outlet of the box or the connecting hose is provided with a one-way membrane.

[0008] Furthermore, the precision metering drainage box and the liquid drainage bag are respectively provided with matching Velcro velvet or bristle surfaces, or matching snap fasteners, at their detachable fixing positions.

[0009] Furthermore, at least one elastic clamp matching the outer diameter of the connecting hose is provided on the outer wall of the polymer drainage bag corresponding to the connecting hose portion.

[0010] Furthermore, the volume of the precision metering drainage box is less than 200ml, the volume of the liquid-aggregating drainage bag is 1000-3000ml, and a switch drain port is provided at the bottom of the liquid-aggregating drainage bag.

[0011] Furthermore, the inner diameter of the drainage tube is 5-12mm; the air inlet is equipped with a matching cap, and the upper end of the precision metering drainage box is connected to the inner cavity with a water-sealed exhaust pipe and a negative pressure change observer; the lower opening of the water-sealed exhaust pipe is equipped with a water-blocking and air-permeable membrane, and an appropriate amount of water-sealing liquid is placed inside the water-sealed exhaust pipe; the negative pressure change observer includes an elastic bladder or electronic pressure gauge with a deformation threshold of 3-8cmH2O, and the elastic bladder includes a corrugated cylinder closed on one side.

[0012] Furthermore, a water-resistant and breathable membrane is provided to fully cover the air inlet.

[0013] Furthermore, a matching cap is installed on the upper opening of the water seal exhaust pipe, and a water-resistant and breathable membrane is installed inside the cap.

[0014] Furthermore, an infrared detector and a timer are installed below the bag inlet adjacent to the connecting hose. The infrared detector has an infrared emitting device on one side of the connecting hose and an infrared receiving device on the other side of the corresponding connecting hose. The timer starts timing when the connecting hose is empty and stops timing when the connecting hose is full of liquid.

[0015] The beneficial effects of this invention are:

[0016] 1. The precision metering drainage box and the liquid-collecting drainage bag work together to accurately observe the real-time drainage speed, detect abnormal drainage conditions and treat them in a timely manner. When not in use, they do not affect the drainage process. They are safe, portable and conducive to the patient's rapid recovery.

[0017] 2. In thoracic surgery drainage, a water-seal exhaust tube is used to expel air from the pleural cavity and allows for direct observation of the gas drainage status. A negative pressure observer can be used to monitor the drainage patency. This replaces the bulky water-seal bottle, eliminates the need for water addition, and is risk-free when pouring, making it safe and convenient.

[0018] 3. The infrared detector and timer work together to record changes in drainage speed during the drainage process, comprehensively assess the progression of the disease, and take appropriate measures. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention (where a is an overall structural diagram, b is a schematic diagram of a rigid precision metering and diversion box, and c is a partial enlarged view of the air inlet).

[0020] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present invention (where a is an overall structural diagram, b is a schematic diagram of the elastic precision metering drainage box, c is a partial enlarged view of the air inlet, and d is a partial enlarged view of the one-way exhaust port).

[0021] Figure 3This is a schematic diagram of the structure of the third embodiment of the present invention (where a is an overall structural diagram, b is a schematic diagram of a rigid precision metering and diversion box, c is a partially enlarged view of the air inlet, and d is a partially enlarged view of the one-way exhaust port).

[0022] Figure 4 This is a schematic diagram of the structure of the fourth embodiment of the present invention. Figure 1 (Infrared detectors and timers are installed in the middle);

[0023] Figure 5 This is a schematic diagram of the structure of the elastic tube clamp of the present invention;

[0024] Figure 6 This is a schematic diagram of the connecting fitting structure at the liquid inlet of the bag according to the present invention (where a is a front view, b is a back view, c is a front view of the air inlet, and d is a cross-sectional view of c).

[0025] Figure 7 For the present invention Figure 4 A structural diagram of the top cover of the precision metering drainage box in the embodiment;

[0026] Figure 8 For the present invention Figure 1 A schematic diagram of the structure in the embodiment, showing the drainage liquid in the precision metering drainage box being discharged into the polymer drainage bag;

[0027] Figure 9 For the present invention Figure 3 A schematic diagram of the structure in the embodiment, showing the drainage liquid in the precision metering drainage box being discharged into the polymer drainage bag;

[0028] Figure 10 For the present invention Figure 4 A schematic diagram of the drainage process in the embodiment;

[0029] Figure 11 For the present invention Figure 4 Example: Quantitative time-division flow velocity curve generated by the drainage process;

[0030] In the picture,

[0031] 1. Drainage connecting pipe; 2. Precision metering drainage box; 20. Box tube drainage plane; 21. Box outlet; 22. Connecting port; 23. Water seal exhaust pipe; 24. Negative pressure change observer; 25. Air inlet; 3. Connecting hose; 4. Liquid collection drainage bag; 41. Bag inlet; 42. Switch drain port; 43. Flexible tube clamp. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions of the present invention and to make the above-mentioned features, objectives, and advantages of the present invention clearer and easier to understand, the present invention will be further described below with reference to embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0033] like Figure 1 The diagram shown is a structural schematic of the first embodiment of the present invention, which is mainly used for drainage in non-thoracic surgeries. The precision drainage bag includes a drainage connecting tube 1, a rigid precision metering drainage box 2, a connecting hose 3, and a liquid-aggregating drainage bag 4 connected in sequence. The volume of the precision metering drainage box 2 is smaller than that of the liquid-aggregating drainage bag 4. The upper part of the adjacent side walls of the precision metering drainage box 2 and the liquid-aggregating drainage bag 4 can be detachably fixed.

[0034] The drainage tube 1 is used to connect with the drainage tube inserted into the body cavity. The fluid in the body cavity enters the precision metering drainage box 2 through the drainage tube 1. The fluid entering the precision metering drainage box 2 is temporarily stored in the precision metering drainage box 2. When the fluid accumulates to a certain volume, the fluid enters the liquid collection drainage bag 4 through the connecting tube 3 and accumulates in the liquid collection drainage bag 4. The outer wall of the precision metering drainage box 2 is printed with relatively fine volume scales (e.g., with 5ml as the smallest unit), which can read the amount of fluid in the precision metering drainage box 2. The outer wall of the liquid collection drainage bag 4 is printed with relatively coarse volume scales (e.g., with 50ml as the smallest unit), which can read the amount of fluid in the liquid collection drainage bag 4. The sum of the fluid volumes in the precision metering drainage box 2 and the liquid collection drainage bag 4 is the total amount of drainage fluid.

[0035] The upper part of the adjacent sidewalls of the precision metering drainage box 2 and the liquid-gathering drainage bag 4 are detachably fixed; the precision metering drainage box 2 is provided with a box outlet 21 at the lower end and an air inlet 25 at the upper end. The liquid-gathering drainage bag 4 is provided with a bag inlet 41 near the upper side, and the box outlet 21 is lower than the bag inlet 41 and lower than the connection port 22 of the drainage connecting pipe 1 in the precision metering drainage box 2; the connecting hose 3 connects the box outlet 21 and the bag inlet 41.

[0036] As the body cavity drainage fluid flows through the drainage tube and drainage connecting tube 1 into the precision metering drainage box 2, the gas inside the precision metering drainage box 2 is discharged through the air inlet 25. The inner cavity of the precision metering drainage box 2 is connected to the connecting hose 3 through the box outlet 21. A small amount of liquid entering the precision metering drainage box 2 enters the connecting hose 3, and the liquid levels in the precision metering drainage box 2 and the connecting hose 3 are at the same level, which is referred to as the box-tube drainage plane 20. As the amount of liquid entering the precision metering drainage box 2 gradually increases, the liquid levels in the connecting hose 3 and the precision metering drainage box 2 rise synchronously, gradually approaching the bag inlet 41. Because the inlet 41 of the bag is lower than the level of the connecting port 22 of the precision metering drainage box 2 in the drainage tube 1, the drainage plane 20 of the box tube reaches the inlet 41 of the bag before rising to the height of the connecting port 22. Afterward, the liquid entering the precision metering drainage box 2 cannot cause the drainage plane 20 of the box tube to continue rising, and the liquid volume in the precision metering drainage box 2 cannot continue to increase. Excess liquid entering the precision metering drainage box 2 is directly discharged into the liquid-aggregating drainage bag 4 through the outlet 21 of the box, the connecting hose 3, and the inlet 41 of the bag. The liquid-aggregating drainage bag 4 has a very large volume and will not obstruct the drainage process before it is full.

[0037] like Figure 8 The diagram illustrates the implementation of draining the liquid from the precision metering drainage box 2 into the polymer drainage bag 4. The precision metering drainage box 2 is detached from the top of the polymer drainage bag 4. The box 2 is then raised so that its outlet 21 is higher than the inlet 41 of the polymer drainage bag 4. External air can enter the box 2 through the air inlet 25. Under gravity, the liquid in the box 2 flows into the polymer drainage bag 4 through the outlet 21, the connecting hose 3, and the inlet 41, thus completing the operation. After the liquid in the precision metering drainage box 2 is drained, it is reattached to the detachable fixing point on the top of the polymer drainage bag 4 to continue drainage treatment.

[0038] When testing the instantaneous drainage rate, first empty all the liquid in the precision metering drainage box 2 into the liquid-aggregating drainage bag 4, thus emptying the liquid in the precision metering drainage box 2. Then, read the volume of drainage fluid entering the precision metering drainage box 2 over a certain period of time to calculate the instantaneous drainage rate. For example: if the volume of liquid in the precision metering drainage box 2 is A ml after 5 minutes, the instantaneous drainage rate during these 5 minutes is 0.2A ml / min. If the volume of liquid in the precision metering drainage box 2 is B ml after 10 minutes, the instantaneous drainage rate during these 10 minutes is 0.1B ml / min.

[0039] To accurately measure the immediate drainage rate, the precision-measured drainage box 2 should have a relatively long vertical height, a relatively narrow horizontal width, and a relatively thin front and rear wall. This allows for a clear change in the liquid level within the box, even with small volume variations, facilitating accurate readings of its internal volume. It is important to note that when printing the volume scale on the outer surface of the precision-measured drainage box 2, the volume of liquid entering the connecting tubing 3 should be taken into account. The liquid in the connecting tubing 3 should be included in the internal volume of the precision-measured drainage box 2, and the external volume scale should be printed according to the sum of these two liquid volumes corresponding to the change in the liquid level within the box. The precision-measured drainage box 2 is preferably set to 70-150ml, which meets the clinical need to assess the drainage rate within 5-30 minutes, enabling timely detection and intervention of abnormalities, and even surgical hemostasis.

[0040] Furthermore, such as Figure 2 As shown in the second embodiment of the present invention, the precision metering drainage box 2 is an elastic box body, and the drainage connecting pipe 1 is provided with a one-way membrane at the communication port 22 of the precision metering drainage box 2; the air inlet 25 is provided with a matching cap, and the liquid outlet 21 or the connecting hose 3 is provided with a one-way membrane.

[0041] This structure is mainly used for negative pressure drainage of fluids outside the pleural cavity. The precision metering drainage box 2, with its elastic body, allows the gas inside to be quickly discharged through the air inlet 25 connected to the upper side of the precision metering drainage box 2. The air inlet 25 is then sealed with a cap. After connecting the drainage tube 1 to the drainage tube, negative pressure is generated under the elastic recoil of the precision metering drainage box 2. This negative pressure is conducted to the drainage tube, thus creating a negative pressure drainage effect on the drainage cavity.

[0042] The drainage connecting tube 1 is provided with a one-way membrane at the communication port 22 of the precision metering drainage box 2. Its function is as follows: after the liquid in the drainage cavity flows out through the drainage tube and the drainage connecting tube 1 into the precision metering drainage box 2, when the precision metering drainage box 2 is squeezed to generate positive pressure, it prevents the liquid in the precision metering drainage box 2 from flowing back and entering the drainage cavity through the drainage connecting tube 1 and the drainage tube. At the same time, the one-way membrane can also prevent the liquid that has entered the drainage connecting tube 1 and the drainage tube from flowing back into the drainage cavity.

[0043] When the precision metering drainage box 2 is set as a flexible box, its precision metering function will inevitably be affected. To observe the liquid volume, the matching cap of the air inlet 25 on the precision metering drainage box 2 must be opened to allow external gas to enter the flexible box. After the box returns to its original shape, the drainage volume data can be read. After reading the data, the gas inside the box should be expelled by squeezing again, the matching cap of the air inlet 25 should be closed, and the box should be released to continue negative pressure drainage.

[0044] It is important to note that whenever the elastic precision metering drainage box 2 is full, if drainage data is not read, simply squeeze the precision metering drainage box 2 to drain the liquid into the polymer drainage bag 4 to continue negative pressure drainage treatment. To prevent the liquid in the polymer drainage bag 4 from flowing back into the precision metering drainage box 2, a one-way diaphragm pointing from the precision metering drainage box 2 to the polymer drainage bag 4 needs to be installed in the box outlet 21 or the connecting tubing 3.

[0045] Furthermore, the precision metering drainage box 2 and the liquid drainage bag 4 are respectively provided with matching Velcro velvet or bristle surfaces, or matching snap fasteners, at their detachable fixing positions. Specifically, there is no fixed matching requirement between the Velcro velvet and bristle surfaces at the detachable fixing positions of the precision metering drainage box 2 and the liquid drainage bag 4; the Velcro velvet and bristle surfaces can be interchanged. However, the contact area and adhesive force of the velvet and bristle surfaces should be large enough to provide a weight greater than that of the precision metering drainage box 2 when filled with drainage fluid, ensuring that the precision metering drainage box 2 will not detach from the liquid drainage bag 4 after being filled with fluid. The precision metering drainage box 2 has a small volume and light weight, and Velcro on the general market can easily meet this requirement. Of course, the detachable fixing positions of the precision metering drainage box 2 and the polymer drainage bag 4 can also be equipped with matching retaining recesses or retaining protrusions. Specifically, common snap fasteners on the market can be selected. Snap fasteners include male and female fasteners. The protrusion of the male fastener can temporarily engage with the recess of the female fastener, providing sufficient fixing force for the detachable fixing of the precision metering drainage box 2 and the polymer drainage bag 4. Of course, it is preferable to set two sets of snap fasteners, with their positions matching each other. One set is set on the left side of the detachable fixing position of the precision metering drainage box 2 and the polymer drainage bag 4, and the other set is set on the right side, both at the same horizontal position.

[0046] Furthermore, such as Figure 1 , Figure 5 and Figure 8 As shown, at least one elastic clamp 43 matching the outer diameter of the connecting hose 3 is provided on the outer wall of the polymer drainage bag 4 at the location corresponding to the connecting hose 3. Preferably, at least one elastic clamp 43 is located at the lower end of the connecting hose 3. After the connecting hose 3 is engaged in the elastic clamp 43, it can exert a certain fixing force on the lower part of the connecting hose 3, preventing the connecting hose 3 from folding or collapsing. Simultaneously, it can also provide a certain supporting and fixing force for the precision metering drainage box 2, strengthening the detachable fixing function of the precision metering drainage box 2 and the polymer drainage bag 4.

[0047] Furthermore, the volume of the precision metering drainage box 2 is less than 200ml. Under normal conditions, when the liquid volume inside the precision metering drainage box 2 after normal suspension is less than 200ml, the liquid will not flow into the liquid collection drainage bag 4. In actual practice, in order to ensure this effect, the volume of the precision metering drainage box 2 from the bottom to the horizontal height of the bag inlet 41 is the effective volume of the precision metering drainage box 2, which is less than 200ml. When the liquid entering the precision metering drainage box 2 exceeds this effective volume, the subsequent drainage liquid enters the precision metering drainage box 2 from the connecting port 22, and then enters the liquid collection drainage bag 4 through the box outlet 21, the connecting hose 3 and the bag inlet 41.

[0048] The volume of the fluid-collecting drainage bag 4 is 1000-3000ml, and a switchable drainage port 42 is provided at the bottom of the fluid-collecting drainage bag 4. When the fluid-collecting drainage bag 4 is nearly full, opening the switchable drainage port 42 can empty the fluid inside the fluid-collecting drainage bag 4, and closing the switchable drainage port 42 allows drainage treatment to continue. The volume of the fluid-collecting drainage bag 4 is preferably set to 1500-2000ml, which can meet the total drainage volume changes of 8-24 hours in clinical practice, avoids too frequent emptying operations, and also avoids the fluid inside the fluid-collecting drainage bag 4 being too heavy, which would hinder the patient's ability to get out of bed.

[0049] Furthermore, such as Figure 3 As shown in the third embodiment of the present invention, the inner diameter of the drainage connecting tube 1 is 5-12mm; the air inlet 25 is provided with a matching cap, and the upper end of the precision metering drainage box 2 is connected to the inner cavity with a water seal exhaust pipe 23 and a negative pressure change observer 24; the lower opening of the water seal exhaust pipe 23 is provided with a water-resistant and breathable membrane, and an appropriate amount of water seal liquid is provided inside the water seal exhaust pipe 23; the negative pressure change observer 24 includes an elastic bladder or electronic pressure gauge with a deformation threshold of 3-8cmH2O, and the elastic bladder includes a corrugated cylinder closed on one side.

[0050] This structure is designed for postoperative drainage of the thoracic cavity. In such cases, air from the lungs may leak into the thoracic cavity through alveolar ruptures. The drainage tube 1 has a sufficiently large inner diameter of 5-12 mm to ensure smooth drainage of air from the thoracic cavity. A matching cap seals the air inlet 25, keeping it closed. When the patient inhales, the thoracic cavity is under negative pressure. The water seal fluid in the water-seal exhaust tube 23 blocks the lower part of the tube, preventing external air from entering the thoracic cavity through the tube and the precision metering drainage box 2, thus avoiding pneumothorax. When the patient exhales, the thoracic cavity is under positive pressure. Air from the thoracic cavity is expelled into the precision metering drainage box 2. The increased pressure in the box pushes the water seal fluid in the tube 23, allowing it to exit to the outside. In this way, air from the thoracic cavity is expelled during exhalation, while air cannot enter the thoracic cavity during inhalation. As the patient breathes alternately, air is continuously expelled from the thoracic cavity, maintaining normal lung function. When the gas is discharged, bubbles can be clearly seen escaping from the water seal fluid in the water seal exhaust pipe 23, allowing for direct observation of the gas drainage status and assessment of the gas drainage condition. The drainage treatment continues until the alveolar rupture heals, the chest drainage tube is removed, and the drainage incision is closed.

[0051] The negative pressure change observer 24 is used to monitor the airtightness of chest drainage treatment and the patency of the chest drainage tube. Under normal conditions, when the patient exhales, the chest cavity pressure increases, and the gas pressure in the connected precision metering drainage box 2 increases synchronously, causing the pressure in the negative pressure change observer 24 to rise. When the patient inhales, the chest cavity pressure decreases, and the gas pressure in the connected precision metering drainage box 2 decreases synchronously, causing the pressure in the negative pressure change observer 24 to fall. The fluctuations in pressure on the negative pressure change observer 24 indicate the normal progress of chest drainage. When the drainage tube is blocked or open, the gas pressure in the precision metering drainage box 2 stops changing, and the pressure in the negative pressure change observer 24 stops fluctuating. In such cases, it is urgent to investigate and address the underlying cause of the abnormality.

[0052] The negative pressure change observer 24 includes an elastic bladder with a deformation threshold of 3-8 cmH2O. During normal breathing, the intrathoracic negative pressure changes by 8 to 15 cmH2O. The elastic bladder with a deformation threshold of 3-8 cmH2O can undergo significant expansion and contraction under this pressure, allowing for accurate detection of intrathoracic negative pressure changes. Figure 3 , Figure 9 and Figure 10 As shown, the elastic pleural sac is configured as a corrugated cylinder with one side closed. The open end of the corrugated cylinder communicates with the inner cavity of the precision metering drainage box 2, while the closed end of the corrugated cylinder is either inside or outside the cavity of the precision metering drainage box 2. When the negative pressure in the pleural cavity changes, the extended axis of the corrugated cylinder contracts and relaxes, allowing medical staff to more clearly observe the changes. The corrugated cylinder has a relatively thin wall, with an inner diameter of 5-20 mm and a length of 5-20 mm being optimal.

[0053] Furthermore, such as Figure 1and Figure 9 As shown, a water-resistant and breathable membrane is installed to fully cover the air inlet 25. Its function is to prevent liquid inside the precision metering drainage box 2 from leaking out through the air inlet 25 and contaminating the patient's clothing or the medical environment after the box is squeezed during drainage. The water-resistant and breathable membrane maintains gas flow while blocking liquid flow, without affecting the aforementioned exhaust function.

[0054] Furthermore, such as Figure 3 and Figure 7 As shown, a matching cap is provided at the upper opening of the water seal vent pipe 23, and a water-blocking and breathable membrane is installed inside the cap. The function of this water-blocking and breathable membrane is to prevent the top of the water seal liquid column from exceeding the upper opening of the water seal vent pipe 23 when the precision metering drainage box 2 is tilted, thus preventing leakage and improving product safety. Furthermore, to reduce water seal liquid evaporation during storage before product use, the water seal vent pipe 23 is not filled with water seal liquid during transportation; water seal liquid is injected into the water seal vent pipe 23 before product use. To facilitate the addition of water seal liquid to the water seal vent pipe 23, a matching cap is provided at the upper opening of the water seal vent pipe 23, with a hollow area in the center of the cap, covered by the water-injection and breathable membrane. During use, the cap is opened to add water seal liquid to the water seal vent pipe 23, and after the water seal liquid is added, the cap is sealed and fixed to the upper opening of the water seal vent pipe 23.

[0055] Furthermore, such as Figure 4 The image shows the fourth embodiment of the present invention. An infrared detector and a timer are installed below the bag inlet 41, adjacent to the ring-shaped connecting hose 3. The infrared detector has an infrared emitting device on one side of the connecting hose 3 and an infrared receiving device on the other side of the corresponding connecting hose 3. The timer starts timing when the connecting hose 3 is empty and stops timing when the connecting hose 3 is filled with liquid.

[0056] The infrared detector and timer are set to remind and record the full state of the precision-measured drainage box 2: When drainage treatment begins, the power is turned on, and the infrared detector and timer start working; as drainage progresses, the amount of fluid in the precision-measured drainage box 2 gradually increases, and the fluid level in the connecting tube 3 also gradually rises; when the precision-measured drainage box 2 is full, the fluid level in the connecting tube 3 also reaches the position of the infrared detector. The fluid absorbs some of the infrared rays emitted by the infrared emitter, significantly weakening the infrared rays received by the infrared receiver. At this time, the timer stops working and alarms; the drainage rate during this period can be accurately obtained based on the amount of fluid in the precision-measured drainage box 2 and the drainage time. At this point, medical staff or family members empty the fluid in the precision-measured drainage box 2 into the liquid-collecting drainage bag 4, and the next stage of drainage can begin and the timer is reset.

[0057] This cyclical recording allows for segmented monitoring of the drainage rate throughout the entire drainage process, enabling observation of the disease's progression. A gradual decrease in drainage rate indicates improvement, and treatment can be terminated once the rate decreases to a certain level. An abnormal increase in drainage rate warrants attention as the condition worsens, requiring timely intervention to prevent serious complications. For example: If the volume of the precision-measured drainage box 2 is V, and the time from the start of drainage to the first full filling of the box is t1, then the average drainage rate during this time is (V / t1). After emptying, the time for the precision-measured drainage box 2 to refill is t2, and the average drainage rate for the second segment is (V / t2), with a total drainage volume of 2V. After emptying again, the time for the precision-measured drainage box 2 to refill is t3, and the average drainage rate for the third segment is (V / t3), with a total drainage volume of 3V. This process continues, and so on. Figure 11 As shown, a drainage curve with volume increasing by V is formed. The slope of the drainage curve can be used to clearly determine the change in drainage speed.

[0058] and Figure 8 Similarly, such as Figure 9 As shown, if you need to Figure 3 The procedure for emptying the drainage fluid from the precision-metered drainage box 2 into the liquid-aggregating drainage bag 4 is as follows: Temporarily clamp the drainage tube or drainage connecting tube 1 to block the chest cavity drainage pathway. Temporarily remove the cap sealing the air inlet 25, allowing the precision-metered drainage box 2 to communicate with the outside air. Remove the precision-metered drainage box 2 from the liquid-aggregating drainage bag 4, raising the height of the box so that the outlet 21 at the bottom of the box 2 is higher than the inlet 41 of the liquid-aggregating drainage bag 4. Under gravity, the fluid in the precision-metered drainage box 2 flows into the liquid-aggregating drainage bag 4 through the outlet 21, connecting tube 3, and inlet 41, thus completing the procedure. After emptying the fluid from the precision-metered drainage box 2, reseal the air inlet 25, restoring the patency of the drainage tube and drainage connecting tube 1. Re-fix the precision-metered drainage box 2 onto the liquid-aggregating drainage bag 4, and drainage treatment can continue.

[0059] It should be added that: such as Figure 6 , Figure 8 and Figure 9 As shown, the bag inlet 41 is composed of an opening and connecting fittings provided on the upper part of the liquid diversion bag 4. Figure 4 The connecting fitting is a structure with an L-shaped channel, used to connect the opening on the liquid drainage bag 4 and the connecting hose 3. One end of the L-shaped channel of the connecting fitting is a flat structure with a central opening, which surrounds the opening on the liquid drainage bag 4 and is sealed and bonded to the liquid drainage bag 4; the other end of the L-shaped channel of the connecting fitting is a round tube structure, which matches and seals and connects with the connecting hose 3.

[0060] The above embodiments are merely illustrative of the principles and effects of this patent application and are not intended to limit this patent application. Any person skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this patent application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this patent application shall still be covered by the claims of this patent application.

Claims

1. A precision drainage bag, characterized in that: It includes a drainage tube (1) connected in sequence, a rigid precision metering drainage box (2), a connecting hose (3) and a liquid-aggregating drainage bag (4); the volume of the precision metering drainage box (2) is smaller than that of the liquid-aggregating drainage bag (4), and the upper part of the adjacent side walls of the precision metering drainage box (2) and the liquid-aggregating drainage bag (4) can be detachably fixed. The precision metering drainage box (2) has a box outlet (21) at the lower end and an air inlet (25) at the upper end; the liquid collection drainage bag (4) has a bag inlet (41) near the upper side, and the box outlet (21) is lower than the bag inlet (41) and lower than the drainage connecting pipe (1) at the connection port (22) of the precision metering drainage box (2); the connecting hose (3) connects the box outlet (21) and the bag inlet (41).

2. The precision drainage bag according to claim 1, characterized in that: The precision metering drainage box (2) is an elastic box body. The drainage connecting pipe (1) is provided with a one-way membrane at the communication port (22) of the precision metering drainage box (2). The air inlet (25) is provided with a matching cap, and the liquid outlet (21) or connecting hose (3) is provided with a one-way membrane.

3. The precision drainage bag according to claim 1 or 2, characterized in that: The precision metering drainage box (2) and the liquid drainage bag (4) are respectively provided with matching Velcro velvet or bristle surface, or matching snap fasteners at the detachable fixing positions.

4. The precision drainage bag according to claim 1 or 2, characterized in that: At least one elastic clamp (43) matching the outer diameter of the connecting hose (3) is provided on the outer wall of the liquid drainage bag (4) at the location corresponding to the connecting hose (3).

5. The precision drainage bag according to claim 1 or 2, characterized in that: The precision metering drainage box (2) has a volume of less than 200ml, the liquid-gathering drainage bag (4) has a volume of 1000-3000ml, and a switch drain port (42) is provided below the liquid-gathering drainage bag (4).

6. The precision drainage bag according to claim 1, characterized in that: The inner diameter of the drainage tube (1) is 5-12mm; the air inlet (25) is equipped with a matching cap, and the upper end of the precision metering drainage box (2) is connected to the inner cavity and equipped with a water seal exhaust pipe (23) and a negative pressure change observer (24); the lower opening of the water seal exhaust pipe (23) is equipped with a water-resistant and breathable membrane, and an appropriate amount of water seal liquid is placed inside the water seal exhaust pipe (23); the negative pressure change observer (24) includes an elastic bladder or electronic pressure gauge with a deformation limit of 3-8cmH2O, and the elastic bladder includes a corrugated cylinder closed on one side.

7. The precision drainage bag according to claim 1, 2, or 6, characterized in that: A water-resistant and breathable membrane is provided to fully cover the air inlet (25).

8. The precision drainage bag according to claim 6, characterized in that: A matching cap is provided on the upper opening of the water seal exhaust pipe (23), and a water-resistant and breathable membrane is provided inside the cap.

9. The precision drainage bag according to claim 1, 2, or 6, characterized in that: An infrared detector and a timer are installed below the bag inlet (41) adjacent to the ring connecting hose (3). The infrared detector has an infrared emitting device on one side of the connecting hose (3) and an infrared receiving device on the other side of the corresponding connecting hose (3). The timer starts timing when the connecting hose (3) is empty and stops timing when the connecting hose (3) is full of liquid.

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