Passive portable negative pressure wound drainage device based on air chemical absorption reaction

Abstract

The invention relates to the technical field of medical instruments, and discloses a passive portable negative-pressure wound drainage device based on air chemical absorption reaction, which comprises a negative-pressure drainage wound protection assembly, a negative-pressure wound treatment device and a connecting assembly, the negative-pressure drainage wound protection assembly comprises a medical film, a negative-pressure drainage dressing, a sucker and a drainage tube, the negative pressure drainage dressing covers a wound, and the medical pasting film covers the negative pressure drainage dressing and the surface of skin around the wound. The passive portable negative-pressure wound drainage device based on the air chemical absorption reaction is composed of the negative-pressure drainage wound protection assembly, the negative-pressure wound treatment device and the connecting assembly, a motor and a battery of traditional electric equipment are not needed, a hanging belt in the connecting assembly can form a space for human limbs or clothes to penetrate through, a clamp can be fixed to the clothes, and the negative-pressure wound treatment device is convenient to use. The whole body gets rid of dependence on electric power, the weight is greatly reduced, a patient can carry the device flexibly and conveniently, activity constraint is reduced, and the device can adapt to the field.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a passive portable negative pressure wound drainage device based on air chemical absorption reaction. Background Technology

[0002] In the field of medical device technology, negative pressure wound therapy (NPWT) has been widely used in the clinical treatment of various wounds as an effective wound management method. At present, most of the mainstream negative pressure wound therapy devices on the market rely on electric vacuum pumps to generate and maintain negative pressure. However, these traditional devices have many insurmountable defects, which seriously limit their applicable scenarios and user experience.

[0003] In terms of portability, traditional electric negative pressure wound therapy devices require motors and batteries to drive the vacuum pump, resulting in an overall weight of over 500g and a relatively large size. For example, the negative pressure drainage device disclosed in the patent with publication number "CN207012362U" has poor portability due to the presence of motors and batteries in its structural design, making it difficult for patients to move flexibly during use and greatly restricting their daily activities. In terms of energy supply, traditional electric negative pressure wound therapy equipment is highly dependent on electricity and requires a continuous power supply to ensure normal operation. This characteristic makes it almost useless in special scenarios where there is no stable power supply, such as field exploration and geological disaster rescue. Its applicability is extremely low and it is difficult to meet the wound management needs in emergency situations. Meanwhile, traditional electric negative pressure wound therapy equipment also has significant noise and cost issues. When the equipment is running, the motor generates noise exceeding 40dB, which not only interferes with the patient's rest but may also have an adverse effect on the patient's psychological state. Moreover, from a manufacturing cost perspective, the production and assembly costs of core components such as motors and vacuum pumps are high, which makes the manufacturing cost of traditional electric negative pressure wound therapy equipment generally high. The high cost increases the equipment procurement burden of medical institutions and also limits the widespread application of such equipment in primary healthcare settings and economically underdeveloped areas. Therefore, a passive portable negative pressure wound drainage device based on air chemical absorption reaction is proposed to solve the above-mentioned problems. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a passive portable negative pressure wound drainage device based on air chemical absorption reaction. This portable drainage device is characterized by being power-free, lightweight, and capable of maintaining stable negative pressure for a long time, thus resolving the contradiction between the energy dependence of traditional equipment and the unstable performance of passive solutions.

[0005] (II) Technical Solution To achieve the aforementioned goal of eliminating the need for electricity, the present invention provides the following technical solution: a passive portable negative pressure wound drainage device based on air chemical absorption reaction, comprising a negative pressure wound drainage component, a negative pressure wound treatment device, and a connecting component. The negative pressure wound drainage component includes a medical film, a negative pressure drainage dressing, a suction cup, and a drainage tube. The negative pressure drainage dressing covers the wound, the medical film covers the negative pressure drainage dressing and the skin surface around the wound, the suction cup is attached to the wound area and adjacent to the negative pressure drainage dressing, and one end of the drainage tube is connected to the negative pressure drainage dressing. The negative pressure wound treatment device includes a negative pressure suction box, a negative pressure suction agent, and a sealing strip. The negative pressure suction agent is placed inside the negative pressure suction box, and the sealing strip is fitted at the opening of the negative pressure suction box. The end of the drainage tube away from the negative pressure drainage dressing is connected to the negative pressure suction box. The connecting assembly includes a strap and a clip, which are respectively connected to the outer wall of the negative pressure suction box.

[0006] Preferably, the edge of the medical film extends beyond the edge of the negative pressure drainage dressing, and the inner surface of the medical film is in contact with the outer surface of the negative pressure drainage dressing.

[0007] Preferably, the suction end of the suction cup faces the wound side, and the fixed end of the suction cup is connected to the negative pressure drainage dressing.

[0008] Preferably, one end of the drainage tube passes through the medical film and extends into the inside of the negative pressure drainage dressing, while the other end of the drainage tube is inserted into the side wall of the negative pressure suction box and communicates with the internal space of the negative pressure suction box.

[0009] Preferably, the negative pressure aspirant is in the form of blocks or granules and is filled inside the negative pressure aspirant box, with a gap between the negative pressure aspirant and the inner wall of the negative pressure aspirant box.

[0010] Preferably, the sealing strip is detachably connected to the opening of the negative pressure suction box, the edge of the sealing strip is in contact with the edge of the opening of the negative pressure suction box, and the sealing strip completely covers the opening of the negative pressure suction box.

[0011] Preferably, the two ends of the strap are respectively connected to the outer wall of the negative pressure suction box, and when the strap is in its natural state, a space is formed between the strap and the outer wall of the negative pressure suction box for human limbs or clothing to pass through.

[0012] Preferably, the negative pressure aspirant is evenly distributed inside the negative pressure aspirant box along the length of the box, and the filling height of the aspirant does not exceed two-thirds of the internal height of the box.

[0013] Preferably, the negative pressure drainage dressing is made of hydrophilic polyurethane foam material with a pore size between 0.5mm and 2mm and has an interwoven porous structure; the medical patch is made of a biological semi-permeable membrane of polyurethane material; and the negative pressure suction box is injection molded from polypropylene material.

[0014] Beneficial effects Compared with the prior art, the present invention provides a passive portable negative pressure wound drainage device based on air chemical absorption reaction, which has the following beneficial effects: 1. This passive portable negative pressure wound therapy device based on air chemical absorption reaction consists of a negative pressure wound therapy component, a negative pressure wound therapy device, and a connecting component. It does not require the motor and battery of traditional electric devices. The strap in the connecting component can form a space for human limbs or clothing to pass through, and the clip can be fixed to clothing. The whole device is free from dependence on electricity, and the weight is greatly reduced. It is convenient for patients to carry flexibly and reduce the restriction of movement. It can also be adapted to special scenarios where there is no power supply, such as in the field and after disasters. It solves the problems of poor portability and strong energy dependence of traditional electric negative pressure wound therapy devices.

[0015] 2. This passive portable negative pressure wound drainage device based on air chemical absorption reaction utilizes a negative pressure drainage dressing made of hydrophilic polyurethane foam with a pore size of 0.5mm-2mm and an interwoven porous structure. The edge of the medical film extends beyond the dressing and fits tightly to ensure airtightness. The negative pressure suction agent is uniformly filled in block / granular form into the negative pressure suction box with gaps, and the filling height does not exceed two-thirds of the box's internal height. The sealing strip completely covers the box opening and fits tightly, which can stably maintain a negative pressure environment and avoid the problem of large negative pressure fluctuations in traditional devices. At the same time, the negative pressure suction box is made of polypropylene, and all components are sealed, further ensuring the reliability of the device and reducing treatment risks. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural view of the passive portable negative pressure wound drainage device based on air chemical absorption reaction of the present invention; Figure 2 This is an exploded view of the passive portable negative pressure wound drainage device based on air chemical absorption reaction of the present invention; Figure 3 This is a schematic diagram of the oxygen-consuming reaction of the present invention; Figure 4 This is a schematic diagram of the passive portable negative pressure wound drainage device based on air chemical absorption reaction of the present invention.

[0017] In the diagram: 1. Negative pressure drainage wound care component; 101. Medical film; 102. Negative pressure drainage dressing; 103. Suction cup; 104. Drainage tube; 2. Negative pressure wound treatment device; 201. Negative pressure suction box; 202. Negative pressure suction agent; 203. Sealing strip; 3. Connecting component; 301. Hanging strap; 302. Clip. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 Please see Figure 1-4 A passive portable negative pressure wound drainage device based on air chemical absorption reaction includes a negative pressure wound drainage component 1, a negative pressure wound treatment device 2, and a connecting component 3. The negative pressure drainage wound care component 1 includes a medical film 101, a negative pressure drainage dressing 102, a suction cup 103, and a drainage tube 104. The negative pressure drainage dressing 102 covers the wound, the medical film 101 covers the negative pressure drainage dressing 102 and the skin surface around the wound, the suction cup 103 is attached to the wound area and adjacent to the negative pressure drainage dressing 102, and one end of the drainage tube 104 is connected to the negative pressure drainage dressing 102. The negative pressure wound treatment device 2 includes a negative pressure suction box 201, a negative pressure suction agent 202 and a sealing strip 203. The negative pressure suction agent 202 is placed inside the negative pressure suction box 201, and the sealing strip 203 is fitted at the opening of the negative pressure suction box 201. The end of the drainage tube 104 away from the negative pressure drainage dressing 102 is connected to the negative pressure suction box 201. The connecting component 3 includes a strap 301 and a clip 302, which are respectively connected to the outer wall of the negative pressure suction box 201.

[0020] In this embodiment, after the negative pressure suction agent 202 in the negative pressure suction box 201 is activated, the negative pressure suction agent 202 continuously consumes the oxygen in the negative pressure suction box 201 through an oxygen consumption reaction, causing the gas volume inside the sealed negative pressure suction box 201 to shrink, thereby forming a negative pressure of -60 to -150 mmHg; this negative pressure is conducted through the drainage tube 104 to the negative pressure drainage dressing 102 covering the wound. Under the action of the sealed space constructed by the medical film 101, the wound exudate is caused to enter the drainage tube 104 through the negative pressure drainage dressing 102 and finally flow into the negative pressure suction box 201 for storage; the entire device is fixed to the patient by the strap 301 or the clip 302, the suction cup 103 helps to maintain the relative position of the negative pressure drainage dressing 102 and the wound area, and the sealing strip 203 ensures the airtightness of the negative pressure suction box 201. After a single activation, it can work continuously for 7 days.

[0021] This drainage device requires no electricity or battery power, completely eliminating the energy dependence of traditional electric NPWT devices. It operates with zero noise and is lighter than traditional electric NPWT devices. Combined with the portable design of the strap 301 and clip 302, it can be carried flexibly by patients, significantly improving their freedom of movement and making it suitable for scenarios without power supply, such as in the wild or after disasters. On the other hand, the negative pressure fluctuation range generated by the negative pressure suction agent 202 is only ±8%, far lower than the ±25% fluctuation range of traditional manual suction devices. Moreover, the negative pressure is maintained for more than 7 days, far exceeding the duration of less than 24 hours of existing chemical foaming agent negative pressure devices. It can provide a stable and long-lasting treatment environment for the wound. At the same time, the material cost is only one-fifth of that of traditional electric NPWT devices, and the cost per treatment is reduced to 1 / 15 of that of electric devices, greatly reducing the threshold for use.

[0022] It should be noted that the negative pressure suction agent 202 of this device is composed of iron powder, activated carbon, sodium chloride, and a water molecule slow-release agent. These components work together to generate negative pressure through an oxygen-consuming reaction, providing impetus for wound drainage. Specifically, iron powder consumes oxygen when it reacts chemically with oxygen, reducing the oxygen content in the enclosed space and thus lowering the air pressure to create a negative pressure environment. Activated carbon has adsorption properties, which can optimize the reaction environment and ensure the stability of the reaction. Sodium chloride can accelerate the oxidation reaction rate of iron powder, making the negative pressure generation process more efficient. The water molecule slow-release agent can slowly release water molecules to maintain the humidity conditions required for the reaction, ensuring that the entire air chemical absorption reaction can proceed continuously and stably, ultimately achieving long-term and stable generation of negative pressure by the device.

[0023] In this embodiment, the oxygen-consuming reaction occurring in the negative pressure suction agent 202 (composed of iron powder, activated carbon, sodium chloride, and water molecule slow-release agent) is the core mechanism for the device to achieve passive negative pressure generation. The specific process is as follows: From the perspective of reaction initiation and basic conditions, the negative pressure attractant 202 in the negative pressure attraction box 201 needs to be activated before the device is used. After activation, the water molecule slow release agent slowly releases water molecules to provide the necessary humidity environment for the reaction, so that the iron powder, activated carbon, sodium chloride and the air in the box can be in full contact, and the basic conditions for oxygen-consuming reaction are met.

[0024] From the perspective of the core reaction process, under the synergistic effect of water molecules and sodium chloride, iron powder, as the main reactant, undergoes an oxidation reaction (i.e., an oxygen-consuming reaction) with oxygen in the air inside the negative pressure suction box 201: Sodium chloride dissolves in the water released by the water molecule slow-release agent to form an electrolyte solution, which can accelerate the electrochemical corrosion process on the surface of iron powder, and promote iron powder to combine with oxygen more efficiently to generate iron oxides (such as iron oxide, iron hydroxide, etc.); At the same time, activated carbon, due to its porous structure, can adsorb some of the intermediate products generated during the reaction process, avoiding product accumulation that affects the continuous progress of the reaction, and can increase the contact area between the reactants and oxygen, further optimizing the reaction efficiency and ensuring that oxygen is continuously and stably consumed.

[0025] From the perspective of the relationship between the reaction and the generation of negative pressure, as oxygen is continuously consumed in the negative pressure suction box 201, the total amount of gas in the box decreases and the volume shrinks, causing the gas pressure inside the box to gradually fall below the external atmospheric pressure, eventually forming a target negative pressure of -60 to -150 mmHg. Moreover, with the continuous provision of humidity by the water molecule slow-release agent and the role of activated carbon in maintaining a stable reaction environment, this oxygen-consuming reaction can continue, thereby achieving a long-term negative pressure maintenance effect of the device being able to work continuously for 7 days at a time, providing a stable power source for wound drainage.

[0026] Example 2 The passive portable negative pressure wound drainage device based on air chemical absorption reaction in this embodiment mainly consists of three parts: negative pressure drainage and wound care component 1, negative pressure wound treatment device 2, and connecting component 3. The structure, material, and manufacturing requirements of each component are as follows: Negative pressure wound dressing component 1 includes the following: Medical film 101: Made of polyurethane material to form a biological semi-permeable membrane. During its preparation, the integrity and uniformity of the membrane are ensured by controlling the film-forming process. When in use, the edge of the medical film 101 must extend at least 3cm beyond the edge of the negative pressure drainage dressing 102, and the inner surface of the medical film 101 must be completely adhered to the outer surface of the negative pressure drainage dressing 102 to ensure the airtightness of the wound area.

[0027] Negative pressure drainage dressing 102: Hydrophilic polyurethane foam material is selected, and its pore size is controlled between 0.5mm and 2mm through foaming process, forming an interlocking and interconnected porous structure; during preparation, it is necessary to ensure that the pore distribution of the foam material is uniform and there is no obvious pore blockage or breakage. When using, it is directly covered to the wound, and the coverage area must completely cover the area 2cm outside the edge of the wound.

[0028] Suction cup 103: Made of medical-grade elastic material, its suction end is designed with an arc-shaped concave structure to fit the skin contour of the wound area; the fixed end of suction cup 103 is connected to the edge area of ​​negative pressure drainage dressing 102 by medical adhesive, and the suction end faces the wound side. After assembly, suction cup 103 and negative pressure drainage dressing 102 are adjacent to each other without obvious gap.

[0029] Drainage tube 104: Made of medical-grade transparent soft tubing, with a wall thickness controlled between 0.8mm and 1.2mm to ensure toughness and resistance to kinking; one end of the drainage tube 104 needs to penetrate through the medical dressing 101 and extend into the negative pressure drainage dressing 102, with an insertion depth of 1 / 2 to 2 / 3 of the thickness of the negative pressure drainage dressing 102; the other end needs to be inserted into the side wall of the negative pressure suction box 201. After insertion, the connection between the tube and the box wall is sealed with sealant to ensure that the drainage tube 104 is connected to the internal space of the negative pressure suction box 201 without leakage.

[0030] The negative pressure wound therapy device 2 includes the following: Negative pressure suction box 201: Made of polypropylene material by injection molding process; the side wall of negative pressure suction box 201 has a reserved opening with a diameter matching the outer diameter of drainage tube 104 for connecting drainage tube 104.

[0031] Negative pressure suction agent 202: It is made by mixing iron powder, activated carbon, sodium chloride and water molecule slow release agent in a certain proportion, and processed into block or granular form (block size is 1cm×1cm×0.5cm, and granular particle size is 2mm-3mm). When filling, the negative pressure suction agent 202 is evenly distributed along the length of the negative pressure suction box 201, and the filling height does not exceed two-thirds of the internal height of the negative pressure suction box 201. At the same time, it is ensured that there is a gap of at least 5mm between the negative pressure suction agent 202 and the inner side wall of the negative pressure suction box 201 to ensure the airflow in the box.

[0032] Sealing strip 203: Made of medical-grade sealing material, its size is perfectly matched with the opening size of the negative pressure suction box 201. The edge of the sealing strip 203 is provided with a raised sealing edge, which forms a detachable snap connection with the groove on the edge of the opening of the negative pressure suction box 201. During assembly, the edge of the sealing strip 203 must be completely fitted with the edge of the opening of the negative pressure suction box 201, and the sealing strip 203 must completely cover the opening of the negative pressure suction box 201 to achieve the sealing of the box.

[0033] Connection component 3 includes the following: The lanyard 301 is made of medical-grade elastic webbing with a width of 1.5cm-2cm and a length of 60cm-80cm designed according to the size of an adult limb. The lanyard 301 is connected to the surface of the negative pressure suction box 201. When the lanyard 301 is in its natural state, it forms a space with a diameter of 10cm-15cm between itself and the outer wall of the negative pressure suction box 201, allowing human limbs or clothing to pass through.

[0034] Clip 302: Made of medical-grade plastic, the clip 302 is used to fix the negative pressure suction box 201 to the user's clothing.

[0035] II. Assembly Steps First, assemble the negative pressure drainage wound dressing component 1: Lay the negative pressure drainage dressing 102 flat on a flat surface, and attach the fixed end of the suction cup 103 to the four corner edges of the negative pressure drainage dressing 102 with medical adhesive, ensuring that the suction end of the suction cup 103 faces upward; then, insert one end of the drainage tube 104 through the preset opening of the medical film 101, and then insert the end into the negative pressure drainage dressing 102 to a preset depth; finally, cover the outer surface of the negative pressure drainage dressing 102 with the medical film 101, so that the edge of the medical film 101 extends at least 3cm beyond the edge of the negative pressure drainage dressing 102, thus completing the assembly of the negative pressure drainage wound dressing component 1.

[0036] Assemble the negative pressure wound therapy device 2: Open the opening of the negative pressure suction box 201, and evenly fill the prepared block or granular negative pressure suction agent 202 along the length of the negative pressure suction box 201, with the filling height not exceeding two-thirds of the height inside the box; then insert the end of the drainage tube 104 away from the negative pressure drainage dressing 102 into the reserved opening on the side wall of the negative pressure suction box 201, and seal the connection with sealant; finally, align the raised sealing edge of the sealing strip 203 with the groove on the edge of the opening of the negative pressure suction box 201, press the sealing strip 203 to achieve a snap-fit ​​connection, ensure the box is sealed, and complete the assembly of the negative pressure wound therapy device 2.

[0037] Assemble the connecting component 3 with the negative pressure wound therapy device 2: Connect the lanyard 301 to the negative pressure suction box 201 to complete the assembly of the entire device.

[0038] III. Device Usage Process Wound pretreatment: Perform routine disinfection and debridement on the patient's wound and surrounding skin to remove necrotic tissue and secretions from the wound surface and ensure that the wound area is clean and dry.

[0039] Fixing the negative pressure drainage wound dressing component 1: Cover the treated wound with the negative pressure drainage dressing 102 from the assembled negative pressure drainage wound dressing component 1, and adjust its position so that the dressing completely covers the wound and the area 2cm outside the edge; then press the suction cup 103 so that the suction end of the suction cup 103 fits tightly with the skin around the wound, which helps to fix the negative pressure drainage dressing 102; finally, extend the edge of the medical film 101 to the skin around the wound to ensure that the film fits the skin completely without wrinkles or air bubbles, creating a sealed wound space.

[0040] Negative pressure wound therapy device 2 fixation: The negative pressure wound therapy device 2 is suspended on the patient's waist, shoulders or other limbs by the strap 301, or it is clipped to a suitable position on the patient's clothing by the clip 302 to ensure that the device is fixed firmly and without shaking.

[0041] Negative pressure activation and drainage: Remove the sealing strip 203 from the negative pressure suction box 201, activate the negative pressure suction agent 202 (the activation method is to start the oxygen consumption reaction when exposed to air), then reinstall the sealing strip 203 and ensure the box is sealed; the negative pressure suction agent 202 continuously consumes the oxygen in the negative pressure suction box 201 through the oxygen consumption reaction, causing the air pressure in the box to gradually decrease, forming a negative pressure of -60 to -150 mmHg; this negative pressure is conducted to the negative pressure drainage dressing 102 through the drainage tube 104, causing the wound exudate to be absorbed by the negative pressure drainage dressing 102 in the sealed wound space, and then flowing into the negative pressure suction box 201 for storage along the drainage tube 104.

[0042] Device maintenance and replacement: The device can work continuously for 7 days after a single activation. During the operation, the amount of exudate stored in the negative pressure suction box 201 should be observed regularly. If the amount of exudate reaches 2 / 3 of the internal volume of the negative pressure suction box 201, the negative pressure wound treatment device 2 should be replaced in time. After the 7-day working cycle, the negative pressure drainage wound care component 1 and the negative pressure wound treatment device 2 should be replaced as a whole to ensure the continuity and safety of treatment.

[0043] In summary, this passive portable negative pressure wound therapy device based on air chemical absorption reaction generates a negative pressure of -60 to -150 mmHg through the oxygen-consuming reaction of the negative pressure suction agent 202 (composed of iron powder, activated carbon, sodium chloride, and water molecule slow-release agent). It requires no electricity or batteries, completely eliminating the energy dependence of traditional electric NPWT devices, and operates with zero noise. The negative pressure fluctuation range is only ±8%, far lower than the ±25% of traditional manual suction devices, and a single activation can sustain operation for 7 days, far exceeding the less than 24-hour duration of existing chemical foaming agent negative pressure devices. It can provide a stable and long-lasting treatment environment for wounds. At the same time, the weight is reduced compared to traditional electric NPWT devices. Combined with the portable design of the strap 301 (which can form a space for human limbs or clothing to pass through) and clip 302 (which can be fixed to clothing) in the connecting component 3, patients can carry it flexibly, significantly improving their freedom of movement, and making it suitable for special scenarios without power supply, such as in the wild and after disasters.

[0044] Furthermore, in the negative pressure drainage wound care component 1, the medical dressing 101 is a polyurethane bio-semi-permeable membrane (the edge extends at least 3cm beyond the negative pressure drainage dressing 102 for sealing), the negative pressure drainage dressing 102 is a 0.5mm-2mm pore size hydrophilic polyurethane foam (with an interwoven porous structure), and the negative pressure wound treatment device 2 has a negative pressure suction box 201 made of polypropylene (with a pre-drilled opening on the side wall to accommodate the drainage tube 104), and a sealing strip 203 with a raised sealing edge (connected to the groove of the box opening for sealing). The material and structural design of each component ensure the device's airtightness, exudate absorption, and structural stability. At the same time, the material cost is only one-fifth of that of traditional electric NPWT devices, and the cost per treatment is reduced to 1 / 15 of that of electric devices, significantly lowering the barrier to use. This not only reduces the procurement burden on medical institutions and the treatment burden on patients, but also facilitates its widespread adoption in primary healthcare settings and economically underdeveloped areas.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A passive portable negative pressure wound therapy device based on air chemical absorption reaction, comprising a negative pressure wound therapy component (1), a negative pressure wound therapy device (2), and a connecting component (3), characterized in that: The negative pressure drainage wound care component (1) includes a medical film (101), a negative pressure drainage dressing (102), a suction cup (103), and a drainage tube (104). The negative pressure drainage dressing (102) covers the wound, the medical film (101) covers the negative pressure drainage dressing (102) and the skin surface around the wound, the suction cup (103) is attached to the wound area and adjacent to the negative pressure drainage dressing (102), and one end of the drainage tube (104) is connected to the negative pressure drainage dressing (102). The negative pressure wound treatment device (2) includes a negative pressure suction box (201), a negative pressure suction agent (202), and a sealing strip (203). The negative pressure suction agent (202) is placed inside the negative pressure suction box (201), and the sealing strip (203) is fitted at the opening of the negative pressure suction box (201). The end of the drainage tube (104) away from the negative pressure drainage dressing (102) is connected to the negative pressure suction box (201). The connecting component (3) includes a strap (301) and a clip (302), which are respectively connected to the outer wall of the negative pressure suction box (201).

2. The passive portable negative pressure wound drainage device based on air chemical absorption reaction according to claim 1, characterized in that: The edge of the medical patch (101) extends beyond the edge of the negative pressure drainage dressing (102), and the inner surface of the medical patch (101) is attached to the outer surface of the negative pressure drainage dressing (102).

3. The passive portable negative pressure wound drainage device based on air chemical absorption reaction according to claim 1, characterized in that: The suction end of the suction cup (103) faces the wound side, and the fixed end of the suction cup (103) is connected to the negative pressure drainage dressing (102).

4. The passive portable negative pressure wound drainage device based on air chemical absorption reaction according to claim 1, characterized in that: One end of the drainage tube (104) passes through the medical film (101) and extends into the negative pressure drainage dressing (102). The other end of the drainage tube (104) is inserted into the side wall of the negative pressure suction box (201) and communicates with the internal space of the negative pressure suction box (201).

5. The passive portable negative pressure wound drainage device based on air chemical absorption reaction according to claim 1, characterized in that: The negative pressure suction agent (202) is filled in the inside of the negative pressure suction box (201) in the form of blocks or granules, and there is a gap between the negative pressure suction agent (202) and the inner wall of the negative pressure suction box (201).

6. The passive portable negative pressure wound drainage device based on air chemical absorption reaction according to claim 1, characterized in that: The sealing strip (203) is detachably connected to the opening of the negative pressure suction box (201). The edge of the sealing strip (203) fits against the edge of the opening of the negative pressure suction box (201), and the sealing strip (203) completely covers the opening of the negative pressure suction box (201).

7. The passive portable negative pressure wound drainage device based on air chemical absorption reaction according to claim 1, characterized in that: The two ends of the strap (301) are respectively connected to the outer wall of the negative pressure suction box (201), and when the strap (301) is in its natural state, a space is formed between the strap (301) and the outer wall of the negative pressure suction box (201) for human limbs or clothing to pass through.

8. The passive portable negative pressure wound drainage device based on air chemical absorption reaction according to claim 1, characterized in that: The negative pressure aspirant (202) is evenly distributed inside the negative pressure aspirant box (201) along the length of the negative pressure aspirant box (201), and the filling height of the negative pressure aspirant (202) does not exceed two-thirds of the internal height of the negative pressure aspirant box (201).

9. A passive portable negative pressure wound drainage device based on air chemical absorption reaction according to claim 1, characterized in that: The negative pressure drainage dressing (102) is made of hydrophilic polyurethane foam material with a pore size between 0.5mm and 2mm and has an interlocking porous structure; the medical patch (101) is made of a biological semi-permeable membrane of polyurethane material; and the negative pressure suction box (201) is injection molded from polypropylene material.

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