Portable medical drainage device with pressure monitoring function

Abstract

The application discloses a portable medical drainage device with pressure monitoring function and relates to the technical field of medical instruments, aiming to solve the problems of poor portability, inaccurate negative pressure control, high use cost, easy air leakage and tube disconnection and liquid reflux of the existing drainage device. The device adopts a split design and comprises a monitoring host capable of being repeatedly disinfected and used, a disposable drainage bag and a drainage pipeline. The monitoring host is a hinge opening and closing box body structure, is internally provided with a pipeline clamping groove with a sealing rubber strip, is internally provided with a built-in micro air pump, a pressure sensor and a closed-loop control unit, is externally provided with a digital display screen and a negative pressure adjusting knob, is provided at the top end with a reversible hanging ring capable of being detachably fixed with the drainage bag through a positioning convex column, is internally provided with an anti-reflux one-way valve, and is provided at the bottom of the drainage bag with a push-pull type liquid discharge switch. The device can be worn on the body, can realize real-time stable pressure monitoring, is reliable in sealing, can effectively reduce the infection risk and the cost of consumables, and is suitable for the needs of patients in bed activities and home rehabilitation.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a portable medical drainage device with pressure monitoring function. Background Technology

[0002] Negative pressure drainage is widely used in clinical settings such as post-surgical procedures and wound repair, and is a common treatment method for draining effusions in body cavities and promoting wound healing. Currently, the mainstream drainage equipment in clinical practice can be divided into several categories, including ward-centered negative pressure systems, water-seal drainage bottles, and simple negative pressure drainage bags. With the promotion of the concept of rapid rehabilitation, patients' needs for getting out of bed and rehabilitation at home continue to increase, and the compatibility shortcomings of existing equipment are becoming increasingly prominent.

[0003] Traditional central negative pressure devices are fixed in the ward, preventing patients from getting out of bed; water-seal bottles are prone to fluid reflux, causing infection; simple negative pressure bulbs lack pressure monitoring, resulting in continuous negative pressure decay, with excessive pressure damaging tissues and insufficient drainage due to excessively low pressure. The few drainage devices with negative pressure pumps are mostly one-piece disposable structures, resulting in high operating costs, simple tubing sealing, and a tendency for leaks and tubing detachment during movement.

[0004] Conventional drainage bags lack dedicated fixing and convenient drainage structures, requiring disconnection of the tubing for drainage, which can easily introduce bacteria. Existing portable drainage devices lack heat dissipation, suspension, and precise alignment and sealing structures, resulting in poor stability during long-term operation. They cannot simultaneously meet the comprehensive clinical needs of real-time pressure monitoring, portability, low-cost reusability, and prevention of backflow and leakage. Summary of the Invention

[0005] This invention aims to solve multiple technical defects of existing medical drainage devices, such as poor portability, inability to monitor and regulate negative pressure in real time, high cost of single use, poor sealing and fixation of pipelines leading to air leakage and tube detachment, easy occurrence of liquid backflow and easy damage to the sealed circuit during drainage operations, and insufficient stability of continuous operation of the equipment.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A portable medical drainage device with pressure monitoring function includes a drainage tube and a drainage bag for storing drainage fluid, and also includes a reusable monitoring host; the monitoring host includes a host upper cover and a host lower base, the host upper cover and the host lower base are rotatably connected on one side by a hinge shaft, and a locking buckle is correspondingly provided on the other side; the mating surface of the host lower base and the host upper cover is provided with a tube clamping groove extending along the length direction, and the inner wall of the tube clamping groove is embedded with an elastic sealing strip; the mating surface of the host lower base is also vertically provided with at least one positioning protrusion; a miniature air pump, a pressure sensor and a control unit are fixed in the internal cavity of the monitoring host. The unit comprises a micro air pump with an air inlet at the bottom of the tubing clamping groove, a built-in air inlet at the suction end of the micro air pump, and a pressure sensor at the detection end connected to the built-in air inlet. The outer surface of the monitoring unit is equipped with a digital display screen, a negative pressure adjustment knob, and function control buttons. The control unit is electrically connected to the micro air pump, pressure sensor, digital display screen, negative pressure adjustment knob, and function control buttons, and is used to adjust the output power of the micro air pump in a closed-loop manner according to a set negative pressure value. The drainage bag has a positioning hole at its upper part that matches the positioning protrusion. The drainage tubing is detachably clamped and fixed in the tubing clamping groove, and both ends of the drainage tubing are used to connect the patient's drainage end to the drainage bag.

[0007] Furthermore, a hanging ring mounting base is fixed to the top end face of the monitoring host, and a hanging ring is hinged on the hanging ring mounting base. The hanging ring can rotate around the hinge axis within the range of 0° to 90°.

[0008] Furthermore, multiple parallel heat dissipation and ventilation grilles are provided on both sides of the monitoring host, and the heat dissipation and ventilation grilles are connected to the internal cavity.

[0009] Furthermore, the cross-section of the pipe clamping groove is an arc shape adapted to the outer wall of the drainage pipe, and the inner walls on both sides of the pipe clamping groove are provided with sealing strip grooves extending along the length of the groove. The elastic sealing strip is embedded in the sealing strip groove, and the top surface of the strip naturally protrudes above the inner wall surface of the clamping groove.

[0010] Furthermore, a positioning groove is provided at the position corresponding to the positioning protrusion on the upper cover of the main unit. When the upper and lower covers are fastened together, the positioning protrusion is embedded in the positioning groove to achieve precise alignment between the upper cover of the main unit and the lower base of the main unit.

[0011] Furthermore, the pressure sensor is used to collect the negative pressure value in the drainage airway in real time and transmit it to the control unit. The control unit transmits the real-time negative pressure value to the digital display screen for digital display, and adjusts the output power of the micro air pump according to the difference between the set pressure and the real-time pressure to maintain the stability of the negative pressure in the drainage circuit.

[0012] Furthermore, the drainage bag is made of medical transparent soft plastic material, the inside of the bag is a drainage fluid storage chamber, the surface of the bag is printed with capacity scale lines, and the top of the bag is provided with a rigid drainage tube interface for sealing and insertion with the drainage tube.

[0013] Furthermore, a push-pull drain switch is provided at the bottom of the drainage bag. The push-pull drain switch is a horizontal push-pull valve core structure used to control the opening and closing of the drain port at the bottom of the drainage bag.

[0014] Furthermore, an anti-backflow check valve is provided inside the lumen of the drainage tube near the drainage bag. The anti-backflow check valve is directed from the patient end to the drainage bag end to prevent fluid backflow.

[0015] Furthermore, the hinge shaft is arranged along the entire length of the monitoring host, and the maximum opening and closing angle of the host upper cover around the hinge shaft is not less than 90°; the locking buckle's seat is fixed to the front side wall of the host's lower base, and the hook is correspondingly fixed to the front side wall of the host upper cover, so that mechanical locking is achieved when the upper and lower covers are fastened together.

[0016] Compared with existing technologies, the beneficial effects of this solution are as follows: This invention adopts a separate, detachable structure for the monitoring host, which can be repeatedly disinfected, and the drainage bag and tubing, which are disposable. Compared with existing integrated disposable negative pressure drainage devices, this significantly reduces the long-term clinical consumable costs. At the same time, the host is equipped with a flip-up hanging ring, which can be hung on a belt, bag strap, bed rail, etc., solving the drawbacks of traditional central negative pressure devices that are immovable, water seal bottles that need to be placed in a low position, and ordinary drainage devices that can only be held by hand. This fully meets the portable use needs of patients getting out of bed, in-hospital transfer, and home rehabilitation. This invention integrates a miniature air pump, a pressure sensor, and a closed-loop control unit. Combined with a digital display and an adjustable negative pressure knob, it can display the drainage negative pressure in real time and automatically stabilize and replenish the pressure. This avoids the problems of continuous negative pressure decay in traditional negative pressure bulbs and the inability to accurately control the pressure of water-sealed bottles. It can prevent excessive negative pressure from damaging the wound mucosa and causing bleeding, while also preventing insufficient negative pressure from causing poor drainage. The drainage tube has a built-in one-way anti-backflow valve, coupled with a bottom push-pull sealed drain switch, allowing drainage without disassembling the tube. It maintains a closed drainage circuit throughout, effectively preventing backflow of accumulated fluid and invasion of external bacteria, reducing the risk of retrograde infection. The monitoring unit adopts a hinged opening and closing, locking buckle structure, combined with a pipe clamping groove with sealing strip and a positioning protrusion double positioning structure. After locking, it can tightly wrap the pipe to achieve air circuit sealing and prevent negative pressure leakage or pipe slippage caused by movement and pulling. The main unit is equipped with a through-type heat dissipation and ventilation grille on both sides to continuously dissipate heat for the internal air pump and ensure stable operation of the equipment for a long time. The positioning protrusion also fixes the main unit and the drainage bag, preventing the main unit from shifting and pulling the pipe during use. The overall structure takes into account sealing performance, operational stability and ease of assembly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall assembly structure of a portable medical drainage device with pressure monitoring function according to the present invention.

[0018] Figure 2 This is a schematic diagram of the standalone three-dimensional structure of the monitoring host of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the main unit for monitoring the open / closed state of the present invention;

[0020] Figure 4 This is a schematic diagram showing the disassembled structure of the drainage bag and drainage pipeline of the present invention.

[0021] In the diagram: 1. Hanging ring; 2. Hanging ring mounting base; 3. Monitoring host; 4. Digital display screen; 5. Negative pressure adjustment knob; 6. Function control buttons; 7. Heat dissipation and ventilation grille; 8. Drainage pipe; 9. Positioning hole; 10. Drainage bag; 11. Drainage fluid storage chamber; 12. Push-pull drain switch; 13. Main unit upper cover; 14. Main unit lower base; 15. Hinge shaft; 16. Pipe clamping groove; 17. Positioning protrusion; 18. Locking buckle; 19. Sealing strip groove; 20. Elastic sealing strip. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be described in further detail below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the embodiments.

[0024] Example: As attached Figure 1-4 As shown, a portable medical drainage device with pressure monitoring function is presented in this embodiment. This device adopts a split, reusable design, representing a preferred implementation that balances portability, precise pressure control, and low cost. The device consists of three parts: a reusable, sterilizable monitoring unit 3, a disposable drainage bag 10, and a drainage tube 8. A clamping and locking structure allows for detachable assembly of the unit, tube, and bag, solving the problems of inconvenience in carrying traditional drainage devices, lack of pressure visibility, and high cost. The device is composed of three detachable and assembleable parts: the reusable monitoring unit 3, the disposable drainage bag 10, and the drainage tube 8. The monitoring unit 3 is detachably fixed to the tube and drainage bag 10 via a clamping structure. After being connected to the drainage air path, it provides negative pressure power, monitors pressure in real time, and displays the value. The drainage tube 8 connects the patient end to the drainage bag 10, enabling drainage fluid flow. The drainage bag 10 stores the drainage fluid and can be directly hung on the patient's clothing for easy portability. The monitoring host 3 has a rectangular box-shaped structure and its size is similar to that of a regular power bank, making it easy to hold and wear. The entire unit consists of the upper cover 13 and the lower base 14 of the host that fit together to form the housing of the monitoring host 3, with a closed component mounting cavity inside.

[0025] The upper surface of the main unit's cover 13 serves as the operation and display plane. A digital display screen 4 is embedded in the upper center of this plane. The screen is a rectangular digital display surface, completely embedded within the cover 13 and flush with its top surface. It displays the negative pressure value in the drainage circuit in real-time digital form. Below the display screen, along its length, are arranged a negative pressure adjustment knob 5 and a function control button 6. The negative pressure adjustment knob 5 is a circular rotary knob, partially protruding from the surface of the cover 13. It can rotate clockwise and counterclockwise to achieve stepless adjustment of the negative pressure, used to regulate the output negative pressure. The function control button 6 is a push-button button embedded in the surface of the cover 13, used to control the device's power-on, power-off, and operating status switching. Multiple parallel ventilation grilles 7 are formed on the left and right side walls of the monitoring main unit 3. These grilles are elongated slots, evenly distributed along the height, directly communicating with the internal mounting cavity to form air convection channels. This facilitates heat dissipation for the internal micro-pump during operation, ensuring stable long-term operation of the device. A hanging ring mounting base 2 is fixedly installed at the center of the top end face of the monitoring host 3. The hanging ring mounting base 2 is a columnar base with a hinge hole laterally opened inside the base. The hanging ring 1 is hinged to the hanging ring mounting base 2 through the hinge shaft. The hanging ring 1 is a closed circular ring structure that can be rotated within the range of 0° to 90° around the hinge shaft: when not in use, the hanging ring is close to the top surface of the monitoring host 3 to reduce the space occupied; when in use, the hanging ring is flipped up and can be hung on the patient's belt, trouser loop, bed rail, or bag strap to achieve portable and fixed device.

[0026] The rear long side of the main unit's upper cover 13 and the main unit's lower base 14 are rotatably connected by a hinge shaft 15. The hinge shaft 15 is arranged along the entire length direction, allowing the main unit's upper cover 13 to be flipped upwards around the shaft and opened, with a maximum opening angle of not less than 90°, facilitating the quick insertion and removal of the drainage pipe 8. Locking buckles 18 are correspondingly provided on the front long side of the main unit's upper cover 13 and the main unit's lower base 14. The buckle's seat is fixedly installed at the center of the front side wall of the main unit's lower base 14, and the buckle's hook is correspondingly fixed at the corresponding position on the front side wall of the main unit's upper cover 13. After the upper and lower covers are fastened, the hooks are engaged in the seat to achieve mechanical locking, which can prevent the upper cover from accidentally popping open during use and ensure the stability of clamping and sealing. A pipe clamping groove 16 extending along the entire length direction is provided at the center of the upper surface of the main unit's lower base 14 (the contact surface that mates with the upper cover). The clamping groove has a circular arc cross-section, and the arc radius matches the outer wall radius of the drainage pipe 8. It is used to support the drainage pipe 8 and limit the lateral displacement of the pipe.

[0027] On the inner walls of the left and right sides of the pipe clamping groove 16, there is a sealing strip groove 19 extending along the entire length of the groove. The sealing strip groove 19 is a rectangular groove, and an elastic sealing strip 20 is embedded in the groove. The top surface of the strip naturally protrudes above the inner wall of the clamping groove. When the main unit cover 13 is fastened and locked, the pressing surface of the corresponding position of the main unit covers presses the drainage pipe 8 downward. The sealing strip 20 undergoes elastic deformation under pressure, tightly wrapping the outer wall of the pipe and filling all the gaps between the pipe and the clamping groove, thereby achieving a sealed isolation of the air passage and preventing negative pressure leakage. On the upper surface of the main unit lower base 14, located on the left and right sides of the pipe clamping groove 16, there is at least one positioning protrusion 17 vertically arranged on each side. The positioning protrusion 17 is a cylindrical protrusion that extends upward perpendicularly to the surface of the lower base, and the diameter of the protrusion matches the inner diameter of the positioning hole 9 of the drainage bag 10. The upper cover 13 of the main unit has a corresponding positioning groove of matching size. When fastened, the positioning protrusion 17 is embedded in the positioning groove to achieve precise alignment of the upper and lower covers, avoiding misalignment of pipelines and failure of sealing due to fastening offset. At the same time, the positioning protrusion 17 can pass through the positioning hole 9 of the drainage bag 10 to fix the relative position of the monitoring main unit 3 and the drainage bag 10.

[0028] Inside the internal mounting cavity of the monitoring host 3, a miniature air pump, a pressure sensor, and a control unit are fixedly installed. The air extraction end of the miniature air pump is connected to the air interface in the middle of the bottom of the pipe clamping slot 16 through an internal air conduit. When the drainage pipe 8 is placed into the clamping slot and locked, the air interface is directly connected to the internal cavity of the drainage pipe 8. When the miniature air pump is working, it draws air from the drainage pipe 8, creating a negative pressure environment in the drainage circuit. The detection probe of the pressure sensor is connected to the internal air conduit and is directly connected to the drainage air path. It can collect the negative pressure value in the air path in real time and convert the pressure signal into an electrical signal and transmit it to the control unit. The control unit is electrically connected to the miniature air pump, the pressure sensor, the digital display screen 4, the negative pressure adjustment knob 5, and the function control button 6. The negative pressure adjustment knob 5 inputs the target pressure adjustment signal to the control unit, the function control button 6 inputs the start / stop and mode switching signals, and the pressure sensor feeds back the real-time pressure signal to the control unit. The control unit adjusts the output power of the micro air pump according to the difference between the set value and the real-time value to achieve closed-loop stable control of the negative pressure, and at the same time transmits the real-time pressure value to the digital display screen 4 for visual display.

[0029] The disposable drainage bag 10 is made of medical transparent soft plastic. The inside of the bag is a drainage fluid storage chamber for storing drainage fluid. The surface of the bag is printed with capacity scale lines and a "7-day use" label, which allows for direct observation of drainage volume and usage time. A rigid drainage tube interface is provided at the top of the bag, which is sealed and connected to the drainage fluid storage chamber of the bag to seal the end of the drainage tube 8 inserted into the bag. A push-pull drainage switch 12 is provided at the bottom of the bag. This switch has a horizontal push-pull valve core structure. Pushing the switch slider horizontally opens the bottom drainage port to quickly discharge the drainage fluid, and pushing it in the opposite direction closes the drainage port and maintains a seal. No additional tools are required for operation. On one side of the bag wall at the top of the bag, corresponding to the position of the positioning protrusion 17 of the main unit's lower base 14, there are two circular positioning holes 9. The diameter of the holes is clearance-fitted with the outer diameter of the positioning protrusion 17. During assembly, the positioning protrusion 17 passes through the positioning holes 9, so that the monitoring main unit 3 is fixed to the upper side wall of the drainage bag 10, preventing the main unit from shifting or the tube from being pulled off during use.

[0030] The drainage tube 8 is a transparent, soft medical catheter with a certain resistance to negative pressure, preventing it from collapsing and becoming blocked under negative pressure. One end of the tube is a patient-side connector for a sealed connection with the drainage tube extending from the patient's body; the other end is a bag-side connector for a sealed connection with the drainage tube interface at the top of the disposable drainage bag 10. Inside the lumen of the drainage tube 8, near the bag-side connector, is an anti-backflow one-way valve. The one-way valve operates from the patient end to the drainage bag 10 end, allowing drainage fluid and gas to flow unidirectionally from the patient side to the drainage bag 10 side, and shuts off in the reverse direction. This effectively prevents the fluid in the drainage bag 10 from flowing back into the patient's body, avoiding retrograde infection.

[0031] Working Principle: The miniature air pump, pressure sensor, and control unit are fixedly installed in the mounting cavity of the lower base of the main unit, completing the connection of the built-in air duct and electrical connection wire; the sealing strip is embedded in the sealing strip groove; the hanging ring is fixed to the top of the monitoring main unit through the hanging ring mounting seat; the upper cover of the main unit and the lower base of the main unit are assembled into an openable whole through the hinge shaft, completing the assembly of the reusable monitoring main unit. This part can be reused after disinfection. Open the locking buckle of the monitoring main unit and flip it upward to open the upper cover of the main unit; place the middle section of the drainage tube of the disposable drainage bag straight into the tube clamping groove of the lower base of the main unit, and adjust the position of the tube so that the tube body is aligned with the air interface at the bottom of the groove; align the positioning hole on the upper part of the drainage bag with the positioning protrusion of the lower base of the main unit and fit it in to initially position the drainage bag and the main unit; then fasten the upper cover of the main unit downward and press the locking buckle to lock it. At this time, the drainage tube is clamped and fixed in the clamping groove. The sealing strip is deformed by pressure and wraps around the tube to achieve air circuit sealing. The internal air circuit of the main unit is connected to the internal cavity of the drainage tube. The main unit is fixed to the side wall of the drainage bag to form an integrated unit.

[0032] The patient-side connector of the drainage tube is sealed to the drainage tube on the patient's skin to form a complete closed drainage circuit. Press the function control button to turn on the device, rotate the negative pressure adjustment knob to set the target negative pressure value, and the miniature air pump will start to extract air from the circuit. The pressure sensor monitors the circuit pressure in real time and displays the value on the digital display screen. When the circuit pressure reaches the set value, the miniature air pump automatically reduces its power to maintain the negative pressure; when the pressure is lower than the set value, it automatically replenishes the pressure, always keeping the negative pressure stable within the set range. This ensures effective drainage while preventing excessive pressure from damaging the patient's mucosa and causing bleeding, and also prevents insufficient drainage from being caused by excessively low pressure. When the patient gets out of bed or goes out, the hanging ring is flipped up to attach the bag to a belt, trouser loop, or bag strap. The drainage bag hangs naturally; its small size and light weight do not affect normal activities. When drainage fluid needs to be drained, there is no need to disassemble the monitoring unit; simply push the push-pull drainage switch at the bottom of the drainage bag horizontally for quick drainage. After the operation is complete, push the switch back to close the seal. After the drainage bag has been used for 7 days, open the locking buckle, remove the used drainage tube and drainage bag, and replace them with new disposable drainage bags and tubes; the monitoring unit can be reused after disinfection, which greatly reduces long-term usage costs.

[0033] The above specific embodiments are merely explanations of the present invention and are not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A portable medical drainage device with pressure monitoring function, comprising a drainage tube (8) and a drainage bag (10) for storing drainage fluid, characterized in that, It also includes a reusable monitoring host (3); the monitoring host (3) includes a host upper cover (13) and a host lower base (14), one side of the host upper cover (13) and the host lower base (14) are rotatably connected by a hinge shaft (15), and the other side is provided with a locking buckle (18); the mating surface of the host lower base (14) and the host upper cover (13) is provided with a pipe clamping groove (16) extending along the length direction, and the inner wall of the pipe clamping groove (16) is fitted with an elastic sealing strip (20); the mating surface of the host lower base (14) is also vertically provided with at least one positioning protrusion (17); a miniature air pump, a pressure sensor and a control unit are fixed in the internal cavity of the monitoring host (3), and an air interface is provided at the bottom of the pipe clamping groove (16). The suction end of the micro air pump is connected to the air path interface through the built-in air path conduit, and the detection end of the pressure sensor is connected to the built-in air path conduit; the outer surface of the monitoring host (3) is provided with a digital display screen (4), a negative pressure adjustment knob (5) and a function control button (6); the control unit is electrically connected to the micro air pump, the pressure sensor, the digital display screen (4), the negative pressure adjustment knob (5) and the function control button (6) respectively, and is used to adjust the output power of the micro air pump in a closed loop according to the set negative pressure value; the upper part of the drainage bag (10) is provided with a positioning hole (9) that matches the positioning protrusion (17), and the drainage tube (8) is detachably clamped and fixed in the tube clamping groove (16). The two ends of the drainage tube (8) are respectively used to connect the patient's drainage end and the drainage bag (10).

2. The portable medical drainage device with pressure monitoring function according to claim 1, characterized in that, The top end face of the monitoring host (3) is fixed with a hanging ring mounting base (2), and a hanging ring (1) is hinged on the hanging ring mounting base (2). The hanging ring (1) can rotate around the hinge axis within the range of 0° to 90°.

3. The portable medical drainage device with pressure monitoring function according to claim 1, characterized in that, The monitoring host (3) has multiple parallel heat dissipation and ventilation grilles (7) on both sides of its sidewalls, and the heat dissipation and ventilation grilles (7) are connected to the internal cavity.

4. The portable medical drainage device with pressure monitoring function according to claim 1, characterized in that, The cross-section of the pipe clamping groove (16) is an arc shape that fits the outer wall of the drainage pipe (8). The inner walls on both sides of the pipe clamping groove (16) are provided with sealing strip grooves (19) extending along the length of the groove. The elastic sealing strip (20) is embedded in the sealing strip groove (19), and the top surface of the strip is naturally higher than the inner wall surface of the clamping groove.

5. The portable medical drainage device with pressure monitoring function according to claim 1, characterized in that, The upper cover (13) of the main unit has a positioning groove at the position corresponding to the positioning protrusion (17). When the upper and lower covers are fastened together, the positioning protrusion (17) is embedded in the positioning groove, so as to achieve precise alignment between the upper cover (13) of the main unit and the lower base (14) of the main unit.

6. The portable medical drainage device with pressure monitoring function according to claim 1, characterized in that, The pressure sensor is used to collect the negative pressure value in the drainage air path in real time and transmit it to the control unit. The control unit transmits the real-time negative pressure value to the digital display screen (4) for digital display and adjusts the output power of the micro air pump according to the difference between the set pressure and the real-time pressure to maintain the stability of the negative pressure in the drainage circuit.

7. The portable medical drainage device with pressure monitoring function according to claim 1, characterized in that, The drainage bag (10) is made of medical transparent soft plastic material. The inside of the bag is a drainage fluid storage chamber (11). The surface of the bag is printed with capacity scale lines. The top of the bag is provided with a rigid drainage tube interface that is sealed and inserted into the drainage tube (8).

8. The portable medical drainage device with pressure monitoring function according to claim 7, characterized in that, The bottom end of the drainage bag (10) is provided with a push-pull drain switch (12), which is a horizontal push-pull valve core structure used to control the opening and closing of the drain port at the bottom of the drainage bag (10).

9. The portable medical drainage device with pressure monitoring function according to claim 1, characterized in that, The drainage tube (8) has an anti-backflow check valve at one end near the drainage bag (10). The anti-backflow check valve is directed from the patient end to the drainage bag (10) end to block the backflow of liquid.

10. The portable medical drainage device with pressure monitoring function according to claim 1, characterized in that, The hinge shaft (15) is arranged along the entire length of the monitoring host (3), and the maximum opening and closing angle of the host upper cover (13) around the hinge shaft (15) is not less than 90°; the locking buckle (18) has its seat fixed to the front side wall of the host lower base (14), and its hook is fixed to the front side wall of the host upper cover (13), so that mechanical locking is achieved when the upper and lower covers are fastened.

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