An abdominal drainage device with infection early warning function

Abstract

This invention discloses an abdominal drainage device with infection early warning function, comprising: a drainage tube for draining postoperative drainage fluid; a drainage bag having a fluid-containing cavity connected to the drainage tube and used to store the drainage fluid drained by the drainage tube; the drainage bag having a first opening connected to the fluid-containing cavity and used to allow drainage fluid to overflow from the fluid-containing cavity; a puncture-resistant cap connected to the drainage bag and used to seal the first opening; a detection chamber detachably connected to the drainage bag; the detection chamber having a protrusion and an internal cavity, the protrusion having a flow channel, the protrusion being used to puncture the puncture-resistant cap and extend into the fluid-containing cavity, so that the fluid-containing cavity, the flow channel, and the internal cavity are sequentially connected; and a pH-responsive detector connected to the detection chamber and located within the internal cavity; the pH-responsive detector is used to react chemically with the drainage fluid. It allows for the replacement of test strips during drainage, improving ease of use.

Description

Technical Field

[0001] This invention relates to the field of medical supplies technology, and in particular to an abdominal drainage device with an infection early warning function. Background Technology

[0002] Abdominal drainage devices are commonly used medical instruments primarily used to drain fluids such as blood, pus, and exudate accumulated in internal or external cavities of the body, thereby reducing pressure, preventing infection, and promoting wound healing. Typical drainage devices include drainage tubes and drainage bags (or negative pressure drainage bottles). Based on the drainage principle, they can be classified into gravity drainage, siphon drainage, and negative pressure drainage, and are widely used in clinical scenarios such as postoperative surgery, wound care, and drainage of infected foci.

[0003] Postoperative infection is a common and serious complication after abdominal drainage. Traditional drainage relies solely on visual observation of the drainage fluid and patient symptoms to diagnose infection, which is often delayed. By the time typical symptoms appear, the infection may have progressed to a more severe stage, increasing the difficulty of anti-infection treatment, the risk of secondary surgery, and even mortality. Existing abdominal drainage devices use pH test strips or urine analysis strips to react with the drainage fluid, enabling the device to monitor for infection and detect it early, guiding medical staff to promptly culture the drainage fluid, adjust antibiotics, or undergo interventional treatment. However, existing abdominal drainage devices with infection warning functions cannot replace the test strips during continuous drainage, resulting in only a single test during the drainage process, which is inconvenient. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide an abdominal drainage device with an infection early warning function, which can replace the test strip during the drainage process, thereby improving ease of use.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] An abdominal drainage device with infection early warning function includes: a drainage tube, a drainage bag, a puncturable cap, a detection chamber, and a pH response detection element;

[0007] The drainage tube is used to drain the drainage fluid generated by the patient after surgery;

[0008] The drainage bag has a liquid-containing cavity, which is connected to the drainage tube and is used to store the drainage fluid drawn out by the drainage tube; the drainage bag has a first opening, which is connected to the liquid-containing cavity and is used to allow the drainage fluid to overflow from the liquid-containing cavity.

[0009] The puncturable cap is connected to the drainage bag and is used to seal the first opening;

[0010] The detection chamber is detachably connected to the drainage bag; the detection chamber has a protrusion and an internal cavity, the protrusion has a flow channel, and the protrusion is used to pierce the puncture cap and extend into the liquid-containing cavity so that the liquid-containing cavity, the flow channel and the internal cavity are connected in sequence;

[0011] The pH response detection device is connected to the detection chamber and located inside the internal cavity; the pH response detection device is used to react chemically with the drainage fluid.

[0012] Furthermore, the abdominal drainage device with infection early warning function also includes a first pumping device, which is connected to the drainage bag and located in the fluid-containing cavity; the first pumping device is connected to the first opening, and a first one-way valve is provided between the first pumping device and the protrusion, wherein the flow direction of the first one-way valve is from the first pumping device to the protrusion, so that the first pumping device pumps the drainage fluid into the internal cavity.

[0013] Furthermore, the drainage bag has a second opening, which is distributed vertically at intervals with the first opening; the abdominal drainage device with infection early warning function also includes a second pumping device, which is connected to the drainage bag and located in the fluid-containing cavity. The second pumping device is connected to the second opening, and a second one-way valve is provided between the first pumping device and the protrusion. The flow direction of the second one-way valve is from the protrusion to the second pumping device, so that the first pumping device pumps the drainage fluid in the internal cavity into the fluid-containing cavity.

[0014] Furthermore, the drainage bag has a support base, and both the first opening and the second opening are located on the support base; the support base is a component made of rigid plastic.

[0015] Furthermore, the first pumping device and the second pumping device are arranged sequentially at intervals along the direction of gravity; the drainage bag is connected to a support pad, which is located inside the liquid-containing cavity and is used to support the first pumping device.

[0016] Furthermore, the inlet pipe of the first pumping device is connected to a float to allow the first pumping device to pump in the drainage liquid located in the upper layer.

[0017] Furthermore, the pH response detection device is a pH test strip, which is located at the bottom of the detection chamber, and the detection chamber is a component made of transparent material.

[0018] Furthermore, the detection chamber is provided with a guide rail, which extends along the length of the detection chamber; the guide rail is located outside the detection chamber; the abdominal drainage device with infection early warning function also includes a colorimetric card, which is slidably connected to the guide rail via a slider.

[0019] Furthermore, the drainage bag is a component made of an elastic material.

[0020] Furthermore, both the first pumping device and the second pumping device are negative pressure elastic bladders.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. This drainage tube is used to drain postoperative drainage fluid from patients. It can be made of medical-grade polyvinyl chloride (PVC) material, with multiple side holes at the front end to prevent blockage, and a connector at the rear end that seals with the inlet of a drainage bag. The drainage tube operates based on the principles of siphon or gravity drainage. Postoperatively, drainage fluid accumulates in the interstitial spaces or body cavities of the patient. Under the pressure difference between the body and the external environment or the influence of gravity, the fluid flows unidirectionally along the drainage tube and is eventually guided into the drainage bag. The side holes at the front end of the tube increase the drainage area, prevent blockage of the tube opening, allow continuous drainage, and improve the reliability of the drainage tube.

[0023] 2. The drainage bag has a fluid-containing cavity that communicates with the drainage tube and is used to store the drainage fluid drawn out by the drainage tube. The drainage bag has a first opening that communicates with the fluid-containing cavity and is used for the drainage fluid to overflow from the fluid-containing cavity. A puncturable cap is connected to the drainage bag and is used to seal the first opening. The puncturable cap can be made of an elastic material, such as rubber or medical silicone. Utilizing the compression sealing principle of the elastomeric material, under normal conditions, it relies on its own elasticity and interference fit with the first opening to tightly seal the opening, preventing drainage fluid leakage or external bacteria from entering the drainage bag. When squeezed by the protrusion, the puncturable cap undergoes elastic deformation, is punctured to form a hole, and allows the protrusion to extend into the fluid-containing cavity. When the protrusion is removed, the puncturable cap relies on its elasticity to return to the closed state of the first opening, achieving resealing, reducing the risk of leakage, and improving safety.

[0024] 3. Based on the detachable connection between the detection chamber and the drainage bag; the detection chamber has a protrusion and an internal cavity. The protrusion has a flow channel and is used to pierce the puncture cap and extend into the liquid-containing cavity, so that the liquid-containing cavity, the flow channel and the internal cavity are connected in sequence; the protrusion, as a puncture element, should have a tapered outer contour to reduce puncture resistance and facilitate puncturing the puncture cap; the hollow flow channel in the protrusion provides a liquid passage for the drainage fluid to enter the detection chamber. After the protrusion pierces the puncture cap and enters the liquid-containing cavity of the drainage bag, the elasticity of the puncture cap is used to wrap and fix the protrusion, so that the detection chamber and the drainage bag are connected; under the action of gravity, or with the addition of a liquid suction device, the drainage fluid flows from the drainage bag through the flow channel into the internal cavity of the detection chamber to react with the pH response detection element. When the test is completed or the test chamber needs to be replaced, simply apply manual force to separate the protrusion from the puncture cap, and then replace it with a different test chamber and reinsert the puncture cap for retesting, thus improving ease of use.

[0025] 4. The pH-responsive detector is connected to the detection chamber and located within the internal cavity. The pH-responsive detector reacts chemically with the drainage fluid. Based on the principle of chemical colorimetry, the detector contains specific chemical reagents, such as o-toluidine, glucose oxidase, and pH indicators. When target analytes in the drainage fluid, such as hemoglobin, glucose, and free hemoglobin from red blood cells, flow through the test strip, they undergo a specific chemical reaction, generating a colored product. The intensity of the color change is positively correlated with the concentration of the target analyte. Color development typically occurs within seconds to minutes, requiring no additional instruments. Medical personnel can interpret the color visually or using a colorimetric card, quickly determining whether a patient is infected, thus improving the device's ease of use. Attached Figure Description

[0026] Figure 1 A schematic diagram of an abdominal drainage device with infection early warning function;

[0027] Figure 2 for Figure 1 A sectional view;

[0028] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0029] In the diagram: 1. Drainage tube; 2. Drainage bag; 201. Liquid-containing cavity; 202. First opening; 203. Second opening; 204. Support body; 3. Punctureable cap; 4. Detection chamber; 401. Protrusion; 402. Internal cavity; 403. Guide rail; 5. pH response detection element; 6. First pump device; 7. First check valve; 8. Second pump device; 9. Second check valve; 10. Support pad; 11. Float; 12. Colorimetric card. Detailed Implementation

[0030] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0031] It should be noted that when an element is described as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is described as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] See Figures 1-3 An abdominal drainage device with infection early warning function according to a preferred embodiment of the present invention is characterized in that it includes: a drainage tube 1, a drainage bag 2, a puncturable cap 3, a detection chamber 4, and a pH response detection element 5;

[0034] Drainage tube 1 is used to drain postoperative drainage fluid. Drainage tube 1 can be made of medical-grade polyvinyl chloride (PVC) material, with multiple side holes at its front end to prevent blockage, and its rear end connected to the inlet of drainage bag 2 via a connector. Drainage tube 1 operates based on the siphon or gravity drainage principle. Postoperatively, drainage fluid accumulated in the patient's interstitial spaces or body cavities flows unidirectionally along drainage tube 1 under the pressure difference between the body and the external environment or the influence of gravity, eventually being guided into drainage bag 2. The side holes at the front end of drainage tube 1 increase the drainage area, prevent drainage fluid from clogging the tube opening, allow continuous drainage, and improve the reliability of drainage tube 1.

[0035] The drainage bag 2 has a liquid-containing cavity 201, which is connected to the drainage tube 1 and is used to store the drainage fluid drawn out by the drainage tube 1. The drainage bag 2 has a first opening 202, which is connected to the liquid-containing cavity 201 and is used to allow the drainage fluid to overflow from the liquid-containing cavity 201. The first opening 202 can be located at the bottom of the drainage bag 2. After the drainage fluid enters the liquid-containing cavity 201 of the drainage bag 2, it can fall to the bottom of the liquid-containing cavity 201 under its own gravity and overflow from the liquid-containing cavity 201 through the first opening 202, making it convenient for staff to remove the drainage fluid for testing. The first opening 202 can also be located at other positions on the drainage bag 2. By adding a liquid suction device, the drainage fluid can be extracted from the liquid-containing cavity 201 for testing. The drainage bag 2 can be made of an elastic material, and staff can squeeze the drainage bag 2 to accelerate the overflow of the drainage fluid from the first opening 202.

[0036] The puncturable cap 3 is connected to the drainage bag 2 and is used to seal the first opening 202. The puncturable cap 3 can be made of an elastic material, such as rubber or medical silicone. Utilizing the compression sealing principle of the elastomeric material, under normal conditions, it relies on its own elasticity and interference fit with the first opening 202 to tightly seal the opening, preventing drainage fluid leakage or external bacteria from entering the drainage bag 2. When squeezed by the protrusion 401, the puncturable cap 3 undergoes elastic deformation, is punctured to form a hole, and allows the protrusion 401 to extend into the fluid-containing cavity 201. When the protrusion 401 is removed, the puncturable cap 3 relies on its elasticity to return to the closed state of the first opening 202, achieving resealing and reducing the risk of leakage. The puncturable cap 3 can also be made of a puncturable thin-film sealing cap, which is low in cost, but its sealing performance after puncture is not as good as that made of elastic material.

[0037] The detection chamber 4 is detachably connected to the drainage bag 2; the detection chamber 4 has a protrusion 401 and an internal cavity 402. The protrusion 401 has a flow channel and is used to pierce the puncture cap 3 and extend into the liquid-containing cavity 201, so that the liquid-containing cavity 201, the flow channel and the internal cavity 402 are connected in sequence; the protrusion 401, as a puncture element, should have a tapered outer contour to reduce puncture resistance and facilitate puncturing the puncture cap 3; the protrusion 401 contains The empty flow channel provides a liquid passage for the drainage fluid to enter the detection chamber 4. When the protrusion 401 pierces the puncture cover 3 and enters the liquid-containing cavity 201 of the drainage bag 2, the elasticity of the puncture cover 3 wraps and fixes the protrusion 401, thus connecting the detection chamber 4 and the drainage bag 2. Under the action of gravity, or with the addition of a suction device, the drainage fluid flows from the drainage bag 2 through the flow channel into the internal cavity 402 of the detection chamber 4 under the external force provided by the suction device. When the test is completed or the detection chamber 4 needs to be replaced, simply apply manual force to separate the protrusion 401 from the puncture cover 3, and a different detection chamber 4 can be replaced and reinserted into the puncture cover 3 for testing, improving ease of use. The detachable connection between the detection chamber 4 and the drainage bag 2 can also be achieved by adding a structure such as a buckle or magnetic attraction between the detection chamber 4 and the drainage bag 2, thus facilitating the replacement of the detection chamber 4.

[0038] The pH-responsive detector 5 is connected to the detection chamber 4 and located within the internal cavity 402. The pH-responsive detector 5 reacts chemically with the drainage fluid. It responds based on changes in the pH concentration of the drainage fluid. Specific chemical reagents, such as o-toluidine, glucose oxidase, and pH indicators, can be fixed onto the pH-responsive detector 5. When target analytes in the drainage fluid, such as hemoglobin, glucose, or free hemoglobin from red blood cells, flow through the test strip, they undergo a specific chemical reaction, generating a colored product. The intensity of the color change is positively correlated with the concentration of the target analyte. Color development typically occurs within seconds to minutes, requiring no additional instruments. Medical personnel can interpret the color visually or using a colorimetric card 12, quickly determining whether a patient is infected, thus improving the ease of use of the device. The detection chamber 4 can be made of transparent material or have an observation window to facilitate observation of the color change of the pH-responsive detector 5 by medical personnel.

[0039] In operation, one end of the drainage tube 1 is placed inside the patient's postoperative body cavity. Gravity or pressure difference is used to draw out the drainage fluid, which is then stored in the fluid-containing cavity 201 of the drainage bag 2. When it is necessary to test the composition of the drainage fluid, the detection chamber 4, with its protrusion 401, punctures the puncturable cap 3 located at the first opening 202 of the drainage bag 2 and extends into the fluid-containing cavity 201. The elasticity of the puncturable cap 3 secures the inserted protrusion 401, connecting the detection chamber 4 to the drainage bag 2. Under the action of active force or gravity, the drainage fluid flows through the channel inside the protrusion 401 into the internal cavity 402 of the detection chamber 4 and is soaked and fixed within the cavity. The pH response detection element 5; the chemical reagents on the test strip immediately undergo a specific color reaction with the target analytes in the drainage fluid. Medical staff can quickly determine whether the drainage fluid contains key components such as occult blood and infection markers by observing the color change of the test strip, thereby quickly determining whether the patient is infected and realizing infection early warning; when medical staff want to test the drainage fluid again, or analyze other components of the drainage fluid, they can manually separate the protrusion 401 from the puncture cap 3. The puncture cap 3 restores the seal to the first opening 202 under its own elasticity. At the same time, the medical staff can replace the new test chamber 4 and reinsert the protrusion 401 into the puncture cap 3.

[0040] Drainage tube 1 is used to drain postoperative drainage fluid from the patient. Drainage tube 1 can be made of medical-grade polyvinyl chloride (PVC) material, with multiple side holes at its front end to prevent blockage, and its rear end connected to the inlet of drainage bag 2 via a connector. Drainage tube 1 operates based on the principles of siphon or gravity drainage. Postoperatively, drainage fluid accumulated in the patient's interstitial spaces or body cavities flows unidirectionally along drainage tube 1 under the pressure difference between the body and the external environment or the influence of gravity, ultimately being guided into drainage bag 2. The side holes at the front end of drainage tube 1 increase the drainage area, prevent drainage fluid from clogging the tube opening, allow continuous seepage of drainage fluid, and improve the reliability of drainage tube 1. The drainage bag 2 has a fluid-containing cavity 201, which is connected to the drainage tube 1 and is used to store the drainage fluid drawn out by the drainage tube 1. The drainage bag 2 has a first opening 202, which is connected to the fluid-containing cavity 201 and is used to allow the drainage fluid to overflow from the fluid-containing cavity 201. A puncturable cap 3 is connected to the drainage bag 2 and is used to seal the first opening 202. The puncturable cap 3 can be made of an elastic material, such as rubber or medical silicone, and uses the compression sealing of the elastic material. In principle, under normal conditions, the opening is tightly sealed by its own elasticity and interference fit with the first opening 202 to prevent leakage of drainage fluid or entry of external bacteria into the drainage bag 2. When squeezed by the protrusion 401, the puncture cap 3 undergoes elastic deformation and is punctured to form a hole, allowing the protrusion 401 to extend into the liquid-containing cavity 201. When the protrusion 401 is removed, the puncture cap 3 returns to the closed state of the first opening 202 by relying on its elasticity, achieving resealing, reducing the risk of leakage, and improving safety in use. The detection chamber 4 and the drainage bag 2 are detachably connected. The detection chamber 4 has a protrusion 401 and an internal cavity 402. The protrusion 401 has a flow channel and is used to pierce the punctureable cover 3 and extend into the liquid-containing cavity 201, so that the liquid-containing cavity 201, the flow channel and the internal cavity 402 are connected in sequence. The protrusion 401 serves as a piercing element, and its overall outer contour should be tapered to reduce piercing resistance and facilitate piercing the punctureable cover 3. The hollow flow channel in the protrusion 401 serves as a drainage channel. The liquid enters the detection chamber 4, providing a liquid passage. When the protrusion 401 pierces the puncture cap 3 and enters the liquid-containing cavity 201 of the drainage bag 2, the elasticity of the puncture cap 3 wraps and fixes the protrusion 401, connecting the detection chamber 4 to the drainage bag 2. Under the action of gravity, or with the addition of a liquid suction device, the drainage liquid flows from the drainage bag 2 through the flow channel into the internal cavity 402 of the detection chamber 4 to react with the pH response detection element 5. After the test is completed or the detection chamber 4 needs to be replaced, simply apply manual force to separate the protrusion 401 from the puncture cap 3, and a different detection chamber 4 can be replaced and reinserted into the puncture cap 3 for testing, thus improving ease of use. The pH response detection element 5 is connected to the detection chamber 4 and located within the internal cavity 402; the pH response detection element 5 is used to chemically react with the drainage liquid.The pH response detection element 5 is based on the principle of chemical colorimetry. Specific chemical reagents, such as o-toluidine, glucose oxidase, and pH indicators, are fixed on the element. When target analytes in the drainage fluid, such as hemoglobin, glucose, and free hemoglobin from red blood cells, flow through the test strip, they undergo a specific chemical reaction to generate a colored product. The intensity of the color change is positively correlated with the concentration of the target analyte. Color development typically occurs within seconds to minutes. No additional instruments are required; medical personnel can interpret the color visually or using a colorimetric card 12, thus quickly determining whether a patient is infected, improving the ease of use of the device.

[0041] Preferably, an abdominal drainage device with infection early warning function further includes a first pumping device 6, which is connected to the drainage bag 2 and located within the liquid-containing cavity 201. The first pumping device 6 is connected to the first opening 202, and a first one-way valve 7 is provided between the first pumping device 6 and the protrusion 401. The flow direction of the first one-way valve 7 is from the first pumping device 6 to the protrusion 401, so that the first pumping device 6 pumps the drainage fluid into the internal cavity 402. The first pumping device 6 can be an electric or mechanical pump, or a manually controlled elastic airbag. Utilizing volume change, piezoelectric effect, or peristaltic squeezing principle, positive pressure is generated inside the pump chamber, actively drawing liquid from the liquid-containing cavity 201 of the drainage bag 2 and pushing it into the internal cavity 402 of the detection chamber 4. It can actively transport the drainage fluid without relying on the liquid level difference within the drainage bag 2, overcoming gravity, pipeline resistance, and the opening pressure of the one-way valve. The first check valve 7 can be, for example, a ball type, spring type, or duckbill type check valve. Utilizing the structure of the valve core, valve seat, and elastic element or diaphragm, it only allows fluid to pass through the protrusion 401 in a set direction from the first pumping device 6. When the first pumping device 6 is working, the pressure before the valve of the first check valve 7 rises above the valve's opening pressure, the valve core is pushed open, and the liquid flows. When the first pumping device 6 stops or a reverse pressure difference occurs, the valve core of the first check valve 7 closes rapidly under the spring force or its own elasticity, blocking the reverse flow of the drainage fluid. This setup allows medical staff to quickly draw drainage fluid into the testing chamber 4 by operating the first pump device 6 when needed for testing. Once the required volume is reached, the operation of the first pump device 6 is stopped, and the first one-way valve 7 prevents drainage fluid from continuing to enter the testing chamber 4. This avoids backflow of drainage fluid already in the testing chamber 4 after the pump stops or due to changes in negative pressure within the drainage bag 2. It ensures that the pH response detection strip 5 only comes into contact with the drainage fluid of a fresh sample, preventing cross-contamination and thus improving the accuracy of the test results.

[0042] Preferably, the drainage bag 2 has a second opening 203, and the second opening 203 and the first opening 202 are distributed sequentially and alternately in the vertical direction; an abdominal drainage device with infection early warning function also includes a second pumping device 8, which is connected to the drainage bag 2 and located in the fluid-containing cavity 201. The second pumping device 8 is connected to the second opening 203, and a second one-way valve 9 is provided between the first pumping device 6 and the protrusion 401. The flow direction of the second one-way valve 9 is from the protrusion 401 to the second pumping device 8, so that the first pumping device 6 pumps the drainage fluid in the internal cavity 402 into the fluid-containing cavity 201. The second opening 203 serves as the inlet for the return of drainage fluid, sending the tested drainage fluid back to a specific height within the drainage bag 2 to avoid direct mixing with the fresh drainage fluid near the first opening 202, facilitating subsequent resampling. The second pumping device 8 is structurally similar to the first pumping device 6, and can be an electric or mechanical pump, or a manually controlled elastic airbag, but its working direction is opposite. It draws liquid from the internal cavity 402 of the testing chamber 4 and pushes it back into the liquid-containing cavity 201 of the drainage bag 2. During postoperative drainage, doctors need to assess the patient's postoperative condition by monitoring the overall flow rate of the drainage fluid. The second pumping device 8 draws the tested drainage fluid back into the drainage bag 2, facilitating accurate assessment and improving ease of use. The second one-way valve 9 is installed in the opposite direction to the first one-way valve 7, allowing liquid to flow only from the testing chamber 4 or its internal cavity 402 through the flow channel of the protrusion 401 to the liquid-containing cavity 201, and then shuts off the flow in the reverse direction. When the second pumping device 8 is working, the pressure before the valve increases, and the valve opens; when the pump stops or the pressure inside the drainage bag 2 is higher than that in the detection chamber 4, the valve automatically closes to prevent the liquid in the drainage bag 2 from flowing back into the detection chamber 4. The check valve can be, for example, a ball type, spring type, or duckbill type check valve.

[0043] Preferably, the drainage bag 2 has a support body 204, and both the first opening 202 and the second opening 203 are located on the support body 204; the support body 204 is a component made of rigid plastic. The main body of the drainage bag 2 is usually made of soft materials such as polyvinyl chloride (PVC) or ethylene-vinyl acetate copolymer (EVA). When openings are made directly on it and components such as the puncture cap 3 are installed, the protrusion 401 of the detection chamber 4 may not be able to pierce the puncture cap 3 properly due to pulling or folding. The support body 204 is made of rigid plastic such as polycarbonate, and its rigid structure can provide stable mechanical support for the first opening 202 and the second opening 203. When the user pierces the puncture cap 3 with the protrusion 401 of the detection chamber 4, the support body 204 can provide reaction support, resist the piercing force and prevent denting deformation, thus preventing the drainage bag 2 from being pushed in and unable to pierce the puncture cap 3, thereby improving piercing stability.

[0044] Preferably, the first pumping device 6 and the second pumping device 8 are arranged alternately along the direction of gravity. A support pad 10 is connected to the drainage bag 2, located within the liquid-containing cavity 201, and used to support the first pumping device 6. The first pumping device 6 and the second pumping device 8 are arranged vertically along the direction of gravity, maintaining a certain distance between them. This spacing prevents interference between the two pumping devices during operation; it also ensures that the inlets of the two pumping devices are at different liquid levels, facilitating the first pumping device 6 to draw the upper liquid into the detection chamber 4, and facilitating the second pumping device 8 to draw the drainage liquid back from the detection chamber 4 and discharge it into the lower liquid layer. The support pad 10 is typically made of soft foam or elastic plastic sheet, fixed to the inner wall of the drainage bag 2, and placed below the first pumping device 6 for support. This prevents the first pumping device 6 from sinking to the bottom of the bag due to gravity, thus preventing collisions between the two pumping devices and improving the service life of both the first and second pumping devices 6.

[0045] Preferably, the inlet pipe of the first pumping device 6 is connected to a float 11 to allow the first pumping device 6 to pump in the drainage fluid located in the upper layer. The float 11 can be made of a material with a density less than that of the drainage fluid, such as a hollow plastic float, a closed-cell foam block, or a low-density capsule. According to the principle of buoyancy, the float 11 will float on the surface of the drainage fluid. By connecting the end of the inlet hose of the first pumping device 6 to the float 11, the inlet will always move up and down with the surface of the drainage fluid. The upper layer of the drainage fluid is relatively clear and closer to the fresh components currently seeping from the body cavity. The first pumping device 6 draws in the newly entered drainage fluid from the upper layer and sends it to the detection chamber 4 for testing. Compared with the old fluid, this makes the test results more accurate and improves the judgment efficiency of medical staff.

[0046] Preferably, the pH response detection element 5 is a pH test strip, located at the bottom of the detection chamber 4, which is a component made of transparent material. The pH test strip contains a mixture of indicators such as methyl red, bromothymol blue, and phenolphthalein. These indicators undergo molecular structural changes at different hydrogen ion concentrations, i.e., different pH values, thus displaying different colors. The pH value of the drainage fluid reflects the infection status. The operator can directly observe the color of the test strip through the detection chamber 4 to determine the patient's infection status without opening it. If the pH deviates from the normal range, it indicates possible infection, anastomotic leakage, or digestive fluid leakage, thus achieving early warning.

[0047] Preferably, the detection chamber 4 is provided with a guide rail 403, which extends along the length of the detection chamber 4; the guide rail 403 is located outside the detection chamber 4; an abdominal drainage device with infection early warning function also includes a colorimetric card 12, which is slidably connected to the guide rail 403 via a slider. A straight guide rail 403 is integrally formed or pasted onto the outer wall of the detection chamber 4, and a slider with a colorimetric card 12 is fitted onto the guide rail 403 and can be slid manually. The colorimetric card 12 is printed with a standard pH color gradient bar, for example, from pH 1 to pH 14, with each integer corresponding to a color patch; after the pH test strip develops color, there is no need to find another colorimetric card 12, simply slide the slider to align the corresponding color area on the colorimetric card 12 with the color development area of ​​the test strip, allowing the user to compare under the same lighting conditions, thereby reducing subjective errors and improving interpretation accuracy.

[0048] Preferably, the drainage bag 2 is a component made of an elastic material. The elastic material can be, for example, thermoplastic elastomer (TPE) or medical-grade silicone rubber. When the drainage fluid enters the drainage bag 2, the bag expands elastically, increasing its internal volume and absorbing the pressure generated by the inflow of fluid. When the first pumping device 6 discharges the fluid from the bag, the elastic recoil helps maintain a certain internal positive pressure, preventing the bag wall from collapsing and blocking the first opening 202 or the second opening 203, thus ensuring that the drainage fluid smoothly enters or exits the detection chamber 4. Furthermore, the elastic bag can automatically adjust its shape according to changes in fluid volume, avoiding wrinkles that could affect the drainage effect when the fluid volume is low.

[0049] Preferably, both the first pumping device 6 and the second pumping device 8 are negative pressure elastic bladders. A negative pressure elastic bladder is a manually operated or pre-loaded elastic energy storage element, typically structured as a compressible spherical or corrugated bladder containing a spring or possessing its own elasticity. When pumping is needed, the user first squeezes the bladder to expel air, then releases it. The bladder expands due to its elastic restoring force, generating negative pressure within its cavity, thereby drawing the drainage fluid into the bladder, which serves as the pump's suction side. The user then squeezes again to expel the liquid from the bladder. Using a negative pressure elastic bladder instead of an electric pump eliminates the need for electricity or other energy sources; liquid delivery is achieved simply by manual pressing, thus improving ease of use.

[0050] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An abdominal drainage device with infection early warning function, characterized in that, include: Drainage tube (1), the drainage tube (1) is used to drain the drainage fluid generated by the patient after surgery; The drainage bag (2) has a liquid-containing cavity (201) which is connected to the drainage tube (1) and is used to store the drainage fluid drawn out by the drainage tube (1); the drainage bag (2) has a first opening (202) which is connected to the liquid-containing cavity (201) and is used to allow the drainage fluid to overflow from the liquid-containing cavity (201). A puncturable cap (3) is connected to the drainage bag (2) and is used to seal the first opening (202). The detection chamber (4) is detachably connected to the drainage bag (2); the detection chamber (4) has a protrusion (401) and an internal cavity (402), the protrusion (401) has a flow channel, and the protrusion (401) is used to pierce the puncture cap (3) and extend into the liquid-containing cavity (201) so that the liquid-containing cavity (201), the flow channel and the internal cavity (402) are connected in sequence; pH response detection device (5), the pH response detection device (5) is connected to the detection chamber (4) and located in the internal cavity (402); the pH response detection device (5) is used to react chemically with the drainage fluid.

2. The abdominal drainage device with infection early warning function according to claim 1, characterized in that, The abdominal drainage device with infection early warning function further includes a first pumping device (6), which is connected to the drainage bag (2) and located in the liquid-containing cavity (201); the first pumping device (6) is connected to the first opening (202), and a first one-way valve (7) is provided between the first pumping device (6) and the protrusion (401). The flow direction of the first one-way valve (7) is from the first pumping device (6) to the protrusion (401), so that the first pumping device (6) pumps the drainage fluid into the internal cavity (402).

3. The abdominal drainage device with infection early warning function according to claim 2, characterized in that, The drainage bag (2) has a second opening (203), and the second opening (203) and the first opening (202) are distributed sequentially at intervals in the vertical direction; the abdominal drainage device with infection early warning function also includes a second pumping device (8), which is connected to the drainage bag (2) and located in the fluid-containing cavity (201). The second pumping device (8) is connected to the second opening (203), and a second one-way valve (9) is provided between the first pumping device (6) and the protrusion (401). The flow direction of the second one-way valve (9) is from the protrusion (401) to the second pumping device (8), so that the first pumping device (6) pumps the drainage fluid in the internal cavity (402) into the fluid-containing cavity (201).

4. An abdominal drainage device with infection early warning function according to claim 3, characterized in that, The drainage bag (2) has a support body (204), and the first opening (202) and the second opening (203) are both provided on the support body (204); the support body (204) is a component made of hard plastic.

5. An abdominal drainage device with infection early warning function according to claim 3, characterized in that, The first pumping device (6) and the second pumping device (8) are arranged sequentially at intervals along the direction of gravity; the drainage bag (2) is connected to a support pad (10), the support pad (10) is located in the liquid-containing cavity (201) and is used to support the first pumping device (6).

6. An abdominal drainage device with infection early warning function according to claim 2, characterized in that, The inlet pipe of the first pumping device (6) is connected to a float (11) so that the first pumping device (6) pumps in the drainage liquid located in the upper layer.

7. An abdominal drainage device with infection early warning function according to claim 1, characterized in that, The pH response detection device (5) is a pH test paper, which is located at the bottom of the detection chamber (4), which is a component made of transparent material.

8. An abdominal drainage device with infection early warning function according to claim 1, characterized in that, The detection chamber (4) is provided with a guide rail (403), which extends along the length of the detection chamber (4); the guide rail (403) is located outside the detection chamber (4); the abdominal drainage device with infection early warning function also includes a colorimetric card (12), which is slidably connected to the guide rail (403) by a slider.

9. An abdominal drainage device with infection early warning function according to claim 1, characterized in that, The drainage bag (2) is a component made of elastic material.

10. An abdominal drainage device with infection early warning function according to claim 3, characterized in that, Both the first pumping device (6) and the second pumping device (8) are negative pressure elastic bladders.

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