Anti-seepage peritoneal drainage tube
By designing a leak-proof abdominal drainage tube and using a sealed airbag for fixation and a pressure sensor for monitoring, the problems of unstable fixation and pressure monitoring of the drainage tube were solved, achieving secure fixation and real-time monitoring of abdominal pressure, thus reducing the risk of infection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHENGDU MILITARY GENERAL HOSPITAL OF PLA
- Filing Date
- 2026-03-30
- Publication Date
- 2026-05-12
AI Technical Summary
Existing abdominal drainage tubes are not securely fixed, are prone to leakage, and cannot effectively monitor intra-abdominal pressure, increasing the risk of infection and causing inconvenience to patients.
A leak-proof abdominal drainage tube was designed, which consists of an internal suction tube, an internal pressure measuring tube, a pressure measuring balloon, a connector, a pressing head, an external suction tube, an external pressure measuring tube, a sealing balloon, and a syringe assembly. The pressure inside the abdominal cavity is monitored by the inflation and fixation of the sealing balloon and the pressure sensor.
It achieves secure fixation of the drainage tube, prevents leakage, reduces the risk of infection, and enables real-time monitoring of intra-abdominal pressure, reducing patient inconvenience.
Smart Images
Figure CN122005976A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical device technology for delivering media to the human body, and particularly to a leak-proof abdominal drainage tube. Background Technology
[0002] In existing technologies, abdominal drainage tubes, as commonly used medical devices in surgical procedures, are typically made of biocompatible materials such as silicone or polyurethane. Their main body is a soft and flexible hollow tube, with a smooth, rounded tip to reduce irritation and damage to surrounding tissues. The core functional structure of the drainage tube mainly includes side holes, an internal support structure, and standardized interfaces. Side holes refer to multiple small holes spirally distributed along the distal end of the tube or along its body, typically with a diameter between 1 and 3 millimeters. This design effectively expands the drainage area, improves drainage efficiency, and significantly reduces the risk of blockage caused by tissue debris or blood clots. The support structure refers to the metal spring coil or rigid plastic core embedded inside some high-end models of drainage tubes. Its function is to enhance the rigidity of the tube and prevent collapse of the lumen under negative pressure suction, making it particularly suitable for draining viscous fluids such as pus, accumulated blood, or necrotic tissue. The standardized connector is located at the end of the drainage tube and is used to connect to a negative pressure suction device or a disposable drainage bag to ensure a smooth and controllable drainage process.
[0003] In clinical practice, the closure between drainage tubes and surgical wounds on the abdominal wall typically relies on medical tape or sterile gauze applied to the skin surface. However, this traditional method of fixation is insufficient to securely hold the drainage tube in place. Fluid or exudate within the abdominal cavity may leak along the tube wall, weakening the adhesive effect of the tape or gauze and increasing the risk of tube displacement or dislodgement. It can also cause maceration, contamination, or even infection of the surrounding skin, creating additional hygiene and care problems. Furthermore, conventional drainage tubes cannot monitor intra-abdominal pressure, and adding pressure sensors increases costs and inconveniences the patient's movement. Summary of the Invention
[0004] The main objective of this invention is to provide a leak-proof abdominal drainage tube, which aims to solve the problems of inconvenient fixation of the drainage tube, easy leakage along the tube wall, and difficulty in pressure testing.
[0005] To achieve the above objectives, the present invention provides a leak-proof abdominal drainage tube, comprising: The inner suction tube has a circular channel eccentrically arranged in the middle of its cross-section, thus forming a crescent shape. The outer wall of the front end of the inner suction tube is provided with multiple liquid inlet holes. An internal pressure testing tube is secured within the channel. A pressure-measuring airbag is connected to the front end of the inner pressure-measuring tube; The connector is cylindrical, with a liquid receiving pipe and a gas receiving pipe at the front end of the connector leading to the rear end of the connector. The front ends of the liquid receiving pipe and the gas receiving pipe are respectively connected to the inner suction pipe and the inner pressure measuring pipe. The connector extends from the middle to the groove at the rear end, and the outer periphery of the rear end of the connector is provided with a threaded structure. The pressing head is threaded to the rear end of the connector, and a buffer layer is provided at the end of the pressing head near the inner suction tube; An external suction tube is connected to the rear end of the liquid receiving tube, wherein both the internal suction tube and the external suction tube are flexible tubes; An external pressure measuring tube is connected to the rear end of the air inlet tube and has a first end cap detachably provided at its free end. The materials of the internal pressure measuring tube and the external pressure measuring tube are selected from soft plastic, aluminum and copper. A sealing airbag, which is annular and sleeved around the outer periphery of the connector, has an inflation tube that passes through the groove. The free end of the inflation tube is detachably provided with a second end cap. Both the sealing airbag and the pressure measuring airbag are made of elastic material. The syringe assembly includes a syringe barrel and a piston that are configured to cooperate with each other. The syringe barrel is detachably connected to the outer end of the external pressure measuring tube, and a plate-shaped pressure sensor is provided at the end of the piston that is away from the syringe barrel.
[0006] Furthermore, the rear end of the air inlet tube has the same shape as the free end of the inflation tube.
[0007] Furthermore, the pressure sensor includes a sensing unit, a processing unit, a power supply, and a display unit. The sensing unit is piezoelectric, the power supply powers the processing unit and the display unit, and the processing unit processes the signal from the sensing unit and displays it on the display unit.
[0008] Furthermore, the outer diameter of the inner suction tube is 1.5 to 3 times the diameter of the channel.
[0009] Furthermore, the pressure-measuring airbag is cylindrical.
[0010] Furthermore, the pressure-measuring airbag and the sealing airbag are made of elastic silicone or polyurethane.
[0011] Furthermore, the syringe is provided with graduations.
[0012] Furthermore, the buffer layer is made of foam material.
[0013] Furthermore, the free end of the external suction tube is detachably connected to a negative pressure bag.
[0014] Furthermore, the front end of the inner suction tube is closed and has a rounded head.
[0015] The leak-proof abdominal drainage tube provided by this invention has a crescent-shaped cross-section for the inner suction tube, which provides a basis for securing the inner pressure measuring tube. The pressure measuring balloon is connected to the front end of the inner pressure measuring tube. The sealing balloon is annular and sleeved around the outer periphery of the connector. The inflation tube of the sealing balloon passes through the groove, so as not to interfere with the fixation of the pressing head. At this time, the sealing balloon and the pressing head together achieve the fixation and closure of the leak-proof abdominal drainage tube at the surgical opening. When the syringe assembly is operated, the pressure measuring balloon is inflated, and the pressure sensor can obtain the pressure signal, which is then converted into a pressure value, and the intra-abdominal pressure can be calculated. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the internal suction tube in the anti-leakage abdominal drainage tube of the first embodiment of the present invention; Figure 2 yes Figure 1 A magnified view of a portion of the image; Figure 3 This is a schematic diagram (first perspective) of the connector in the anti-leakage abdominal drainage tube according to the first embodiment of the present invention. Figure 4 This is a schematic diagram (second perspective) of the connector in the anti-leakage abdominal drainage tube according to the first embodiment of the present invention. Figure 5 This is a schematic diagram (first perspective) of the installation of the connector in the anti-leakage abdominal drainage tube according to the first embodiment of the present invention. Figure 6 yes Figure 5 A partial magnification; Figure 7 This is a schematic diagram (second perspective) of the installation of the connector in the anti-leakage abdominal drainage tube according to the first embodiment of the present invention. Figure 8 This is a schematic diagram of the use of the leak-proof abdominal drainage tube in the first embodiment of the present invention (the pressure measuring balloon is empty). Figure 9 This is a schematic diagram of the use of the anti-leakage abdominal drainage tube in the first embodiment of the present invention (pressure measuring balloon inflation).
[0017] Reference numerals: 100-Inner suction tube, 110-Channel, 200-Inner pressure measuring tube, 300-Pressure measuring airbag, 400-Connector, 410-Liquid receiving tube, 420-Air receiving tube, 430-Groove, 500-Pressing head, 510-Buffer layer, 600-Outer suction tube, 700-Outer pressure measuring tube, 800-Sealing airbag, 810-Inflation tube, 900-Injector assembly, 910-Syringe, 920-Piston section, 930-Pressure sensor. Detailed Implementation
[0018] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
[0019] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, units, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connection or wireless coupling. The term “and / or” as used herein includes all or any of the units and all combinations of one or more associated listed items.
[0020] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.
[0021] Reference Figures 1 to 9 In one embodiment of the present invention, a leak-proof abdominal drainage tube includes: The inner suction tube 100 has a circular channel 110 eccentrically arranged in the middle of its cross-section, thus forming a crescent shape. The outer wall of the front end of the inner suction tube 100 is provided with multiple liquid inlet holes. The internal pressure testing tube 200 is secured in the channel 110; A pressure-measuring airbag 300 is connected to the front end of the inner pressure-measuring tube 200; The connector 400 is cylindrical. The front end of the connector 400 is provided with a liquid receiving pipe 410 and a gas receiving pipe 420 that lead to the rear end of the connector 400. The front ends of the liquid receiving pipe 410 and the gas receiving pipe 420 are respectively connected to the inner suction pipe 100 and the inner pressure measuring pipe 200. The connector 400 extends from the middle to the rear end of the groove 430. The outer periphery of the rear end of the connector 400 is provided with a threaded structure. The pressing head 500 is threaded to the rear end of the connector 400, and a buffer layer 510 is provided at one end of the pressing head 500 near the inner suction tube 100. An external suction tube 600 is connected to the rear end of the liquid receiving tube 410, wherein both the internal suction tube 100 and the external suction tube 600 are flexible tubes; An external pressure measuring tube 700 is connected to the rear end of the air inlet tube 420 and has a first end cap detachably provided at its free end. The materials of the internal pressure measuring tube 200 and the external pressure measuring tube 700 are selected from soft plastic, aluminum and copper. The sealing airbag 800 is annular and sleeved on the outer periphery of the connector 400. The sealing airbag 800 has an inflation tube 810 that passes through the groove 430. The free end of the inflation tube 810 is detachably provided with a second end cap. Both the sealing airbag 800 and the pressure measuring airbag 300 are made of elastic material. The syringe assembly 900 includes a syringe 910 and a piston 920 that are configured to cooperate with each other. The syringe 910 is detachably connected to the outer end of the external pressure measuring tube 700. A sheet-shaped pressure sensor 930 is provided at the end of the piston 920 away from the syringe 910.
[0022] In existing technologies, traditional fixation methods are difficult to securely fix drainage tubes. Fluid or exudate in the abdominal cavity may seep out along the tube wall, which not only weakens the adhesion of adhesive tape or gauze, increasing the risk of drainage tube displacement or dislodgement, but may also cause maceration, contamination or even infection of the surrounding skin, resulting in additional hygiene and care problems. At the same time, conventional drainage tubes cannot monitor intra-abdominal pressure, and adding pressure sensors increases costs and also inconveniences the patient's movement.
[0023] The leak-proof abdominal drainage tube provided by the present invention includes an inner suction tube 100, an inner pressure measuring tube 200, a pressure measuring airbag 300, a connector 400, a pressing head 500, an outer suction tube 600, an outer pressure measuring tube 700, a sealing airbag 800, and a syringe assembly 900.
[0024] The inner suction tube 100 has a crescent-shaped circular channel 110 eccentrically positioned at the center of its cross-section. Multiple liquid inlet holes are provided on the outer wall of the front end of the inner suction tube 100, allowing fluid to be drawn in through these holes. The diameter of the inner suction tube 100 is typically 0.2 to 3 cm. The inner pressure measuring tube 200 is secured within the channel 110. A pressure measuring bladder 300 is connected to the front end of the inner pressure measuring tube 200. The pressure measuring bladder 300 can be made of elastic silicone or polyurethane to avoid affecting the internal and external pressure. The pressure measuring bladder 300 has a capacity of approximately 50 ml when uninflated, expanding to 200 to 300 ml during testing.
[0025] The connector 400 is cylindrical, with a liquid receiving tube 410 and a gas receiving tube 420 extending from its front end to its rear end. The front ends of the liquid receiving tube 410 and the gas receiving tube 420 correspond to the inner suction tube 100 and the inner pressure measuring tube 200, respectively. A groove 430 extends from the middle of the connector 400 to its rear end. A threaded structure is provided on the outer periphery of the rear end of the connector 400.
[0026] The press head 500 is threaded to the rear end of the connector 400. A buffer layer 510 is provided at one end of the press head 500 near the inner suction tube 100. When the cylindrical press head 500 is connected to the connector 400, it can be tightened and loosened. The presence of the buffer layer 510 allows for more thorough contact between the press head 500 and the skin. The material of the buffer layer 510 can be various types of polymers.
[0027] The external suction tube 600 is connected to the rear end of the receiving tube 410. The free end of the external suction tube 600 is connected to an external negative pressure device, such as a negative pressure bottle, negative pressure bag, or negative pressure pump. Both the internal suction tube 100 and the external suction tube 600 are flexible tubes, thus reducing interference with the patient. The specific material can be rubber or silicone, etc.
[0028] The external pressure measuring tube 700 is connected to the rear end of the air inlet tube 420, and its free end is detachably equipped with a first end cap. The materials of the internal pressure measuring tube 200 and the external pressure measuring tube 700 are selected from soft plastic, aluminum and copper, which have a certain structural strength and will not deform under air pressure, while also providing a certain degree of deformation in length.
[0029] The sealing airbag 800 is annular and sleeved around the outer periphery of the connector 400. An inflation tube 810 extends from the sealing airbag 800, passing through a groove 430. The inflation tube 810 passes through the groove 430 to avoid interfering with the fixation of the pressing head 500. Both the sealing airbag 800 and the pressure-measuring airbag 300 are made of elastic material, allowing for some deformation. When the sealing airbag 800 is inflated through the inflation tube 810, the sealing airbag 800 expands, creating a seal. A second sealing head is detachably provided at the free end of the inflation tube 810.
[0030] The syringe assembly 900 includes a syringe barrel 910 and a piston 920 that are configured to cooperate with each other. The syringe barrel 910 is detachably connected to the outer end of the external pressure measuring tube 700, and a plate-shaped pressure sensor 930 is provided at the end of the piston 920 away from the syringe barrel 910. When the syringe assembly 900 is operated, the pressure measuring air bag 300 is inflated by pushing the piston 920. At this time, the pressure sensor 930 on the piston 920 can obtain a pressure signal. The force on the outer end of the piston 920 is the same as the force on the inner end. The force on the inner end of the piston 920 is equal to the product of the area of the piston 920 and the pressure inside the syringe barrel 910. Therefore, the pressure signal on the pressure sensor 930 can be converted into a pressure value inside the syringe barrel 910.
[0031] During operation, the lengths of the inner suction tube 100 and the inner pressure measuring tube 200 are trimmed according to the location requirements. The inner pressure measuring tube 200 is then secured to the inner suction tube 100. The pressure measuring airbag 300 is connected to the front end of the inner pressure measuring tube 200. The front ends of the air connecting tube 420 and the liquid connecting tube 410 on the connector 400 are connected to the inner suction tube 100 and the inner pressure measuring tube 200, respectively. The sealing airbag 800 is fitted onto the connector 400. After the inflation tube 810 is installed into the groove 430, the operating pressing head 500 is threaded onto the connector 400. The outer suction tube 600 and the outer pressure measuring tube 700 are connected to the rear ends of the air connecting tube 420 and the liquid connecting tube 410 on the connector 400, respectively. Insert the leak-proof abdominal drainage tube into the surgical opening, and extend the internal aspiration tube 100 to the appropriate position. At this time, the sealing balloon 800 is also inserted to the appropriate position (precisely under the skin). Inflate the sealing balloon 800 through the inflation tube 810 to achieve the effect of sealing the surgical opening. The position of the sealing balloon 800 can be judged by the resistance during the inflation process. Adjust the pressure head 500 to contact the skin base. At this time, the sealing balloon 800 and the pressure head 500 together fix and seal the leak-proof abdominal drainage tube at the surgical opening. Connect the external aspiration tube 600 to the external negative pressure working part (such as a negative pressure bag) to perform the aspiration action. Connect the syringe assembly 900 to the external pressure measuring tube 700, and inflate the pressure measuring balloon 300 through the syringe assembly 900. The pressure sensor 930 can obtain the pressure value. The pressure sensor 930 receives a pressure signal, which, when input to the area of the piston section 920, allows for the calculation of the pressure inside the syringe 910. The air pressure inside the pressure-measuring balloon 300 is consistent with the pressure inside the syringe 910, while the pressure inside the pressure-measuring balloon 300 is consistent with the abdominal pressure outside the pressure-measuring balloon 300. However, the expansion of the pressure-measuring balloon 300 increases the abdominal pressure to a certain extent, and the increase in abdominal pressure is proportional to the amount of air inflated. Under normal use, the syringe assembly 900 injects a fixed amount of air into the pressure-measuring balloon 300. The pressure value inside the syringe 910 obtained by calculating the pressure signal from the pressure sensor 930 at this time is the calculated abdominal pressure. When the inflation volume is too large, the pressure value can be corrected downwards. The ratio for correcting the intra-abdominal pressure value based on the inflation volume is obtained from actual measurements. For example, during the use of a leak-proof intra-abdominal drainage tube, a pressure gauge is directly inserted, and the pressure-measuring balloon 300 is inflated to different volumes using the syringe assembly 900. Different calculated intra-abdominal pressures are obtained, and a correction factor is calculated based on the measured values of the pressure gauge. In subsequent use, the intra-abdominal pressure can be corrected under different air injection volume test conditions without the need for a pressure gauge, simply by using the correction factor.
[0032] In summary, the internal suction tube 100 has a crescent-shaped cross-section, providing a basis for securing the internal pressure measuring tube 200. The pressure measuring balloon 300 is connected to the front end of the internal pressure measuring tube 200. The sealing balloon 800 is annular and sleeved around the outer periphery of the connector 400. The inflation tube 810 of the sealing balloon 800 passes through the groove 430, thus not interfering with the fixation of the pressing head 500. At this time, the sealing balloon 800 and the pressing head 500 together achieve the fixation and closure of the leakage-proof abdominal drainage tube at the surgical opening. When the syringe assembly 900 is operated, the pressure measuring balloon 300 is inflated, and the pressure sensor 930 can obtain the pressure signal, which is then converted into a pressure value, and the intra-abdominal pressure can be calculated.
[0033] Reference Figure 5 In one embodiment, the rear end of the air inlet pipe 420 has the same shape as the free end of the air inlet pipe 810.
[0034] In this embodiment, the end shapes of the air inlet tube 420 and the inflation tube 810 are made consistent, so that the pressure measuring airbag 300 or the sealing airbag 800 can be inflated and inhaled as needed using the syringe assembly 900.
[0035] In one embodiment, the pressure sensor 930 includes a sensing unit, a processing unit, a power supply, and a display unit. The sensing unit is piezoelectric, the power supply powers the processing unit and the display unit, and the processing unit processes the signal from the sensing unit and displays it on the display unit.
[0036] In this embodiment, when the syringe assembly 900 is operated, the sensing part is compressed and generates a piezoelectric signal. The processing part converts the piezoelectric signal of the sensing part and displays it on the display part.
[0037] In one embodiment, the outer diameter of the inner suction tube 100 is 1.5 to 3 times the diameter of the channel 110.
[0038] In this embodiment, the diameter ratio between the inner suction tube 100 and the channel 110 is limited to ensure both liquid aspiration and pressure measurement effects.
[0039] Reference Figure 9 In one embodiment, the pressure-measuring airbag 300 is cylindrical.
[0040] In this embodiment, the pressure measuring airbag 300 is set as a columnar shape to avoid the problem of excessive deformation of a spherical airbag.
[0041] In one embodiment, the pressure-measuring airbag 300 and the sealing airbag 800 are made of elastic silicone or polyurethane.
[0042] In this embodiment, the materials of the pressure-measuring airbag 300 and the sealing airbag 800 are limited to commonly used medical materials, while providing a superior elastic deformation effect.
[0043] In one embodiment, the syringe 910 is provided with a scale.
[0044] In this embodiment, the amount of air injected into the pressure-measuring airbag 300 can be calculated using the scale on the syringe 910.
[0045] In one embodiment, the buffer layer 510 is a foam material.
[0046] In this embodiment, the material form of the buffer layer 510 is limited, thereby allowing the pressure head 500 to make more sufficient contact with the skin. Specifically, the material of the buffer layer 510 can be various types of polymers.
[0047] In one embodiment, the free end of the external suction tube 600 is detachably connected to a negative pressure bag.
[0048] In this embodiment, a negative pressure bag is added so that it can be used directly without matching the negative pressure unit.
[0049] In one embodiment, the front end of the inner suction tube 100 is closed and has a rounded head.
[0050] In this embodiment, the front end of the internal suction tube 100 is shaped to reduce the discomfort caused by the front end of the internal suction tube 100 to the abdominal tissues.
[0051] In summary, the leak-proof abdominal drainage tube provided by this invention has a crescent-shaped cross-section for the inner suction tube 100, which provides a basis for securing the inner pressure measuring tube 200. The pressure measuring balloon 300 is connected to the front end of the inner pressure measuring tube 200. The sealing balloon 800 is annular and sleeved around the outer periphery of the connector 400. The inflation tube 810 of the sealing balloon 800 passes through the groove 430, so as not to interfere with the fixation of the pressing head 500. At this time, the sealing balloon 800 and the pressing head 500 together achieve the fixation and closure of the leak-proof abdominal drainage tube at the surgical opening. When the syringe assembly 900 is operated, the pressure measuring balloon 300 is inflated, and the pressure sensor 930 can obtain the pressure signal, which is then converted into a pressure value, and the intra-abdominal pressure can be calculated.
[0052] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.
Claims
1. A leak-proof abdominal drainage tube, characterized in that, include: The inner suction tube has a circular channel eccentrically arranged in the middle of its cross-section, thus forming a crescent shape. The outer wall of the front end of the inner suction tube is provided with multiple liquid inlet holes. An internal pressure testing tube is secured within the channel. A pressure-measuring airbag is connected to the front end of the inner pressure-measuring tube; The connector is cylindrical, with a liquid receiving pipe and a gas receiving pipe at the front end of the connector leading to the rear end of the connector. The front ends of the liquid receiving pipe and the gas receiving pipe are respectively connected to the inner suction pipe and the inner pressure measuring pipe. The connector extends from the middle to the groove at the rear end, and the outer periphery of the rear end of the connector is provided with a threaded structure. The pressing head is threaded to the rear end of the connector, and a buffer layer is provided at the end of the pressing head near the inner suction tube; An external suction tube is connected to the rear end of the liquid receiving tube, wherein both the internal suction tube and the external suction tube are flexible tubes; An external pressure measuring tube is connected to the rear end of the air inlet tube and has a first end cap detachably provided at its free end. The materials of the internal pressure measuring tube and the external pressure measuring tube are selected from soft plastic, aluminum, and copper. A sealing airbag, which is annular and sleeved around the outer periphery of the connector, has an inflation tube that passes through the groove. The free end of the inflation tube is detachably provided with a second end cap. Both the sealing airbag and the pressure measuring airbag are made of elastic material. The syringe assembly includes a syringe barrel and a piston that are configured to cooperate with each other. The syringe barrel is detachably connected to the outer end of the external pressure measuring tube, and a plate-shaped pressure sensor is provided at the end of the piston that is away from the syringe barrel.
2. The leak-proof abdominal drainage tube according to claim 1, characterized in that, The rear end of the air inlet pipe has the same shape as the free end of the air inlet pipe.
3. The leak-proof abdominal drainage tube according to claim 1, characterized in that, The pressure sensor includes a sensing unit, a processing unit, a power supply, and a display unit. The sensing unit is piezoelectric. The power supply provides power to the processing unit and the display unit. The processing unit processes the signal from the sensing unit and displays it on the display unit.
4. The leak-proof abdominal drainage tube according to any one of claims 1 to 3, characterized in that, The outer diameter of the inner suction tube is 1.5 to 3 times the diameter of the channel.
5. The leak-proof abdominal drainage tube according to any one of claims 1 to 3, characterized in that, The pressure-measuring airbag is cylindrical.
6. The leak-proof abdominal drainage tube according to any one of claims 1 to 3, characterized in that, The pressure-measuring airbag and the sealing airbag are made of elastic silicone or polyurethane.
7. The leak-proof abdominal drainage tube according to any one of claims 1 to 3, characterized in that, The syringe is equipped with graduations.
8. The leak-proof abdominal drainage tube according to any one of claims 1 to 3, characterized in that, The buffer layer is made of foam material.
9. The leak-proof abdominal drainage tube according to any one of claims 1 to 3, characterized in that, The free end of the external suction tube is detachably connected to a negative pressure bag.
10. The leak-proof abdominal drainage tube according to any one of claims 1 to 3, characterized in that, The front end of the inner suction tube is closed and has a rounded head.