Portable negative pressure device

Abstract

The utility model relates to the technical field of medical instruments, in particular to a portable negative pressure device. The device comprises a sealing layer, a liquid absorption layer and a manual air exhaust mechanism, a liquid absorption layer is arranged below the sealing layer, and a through hole is formed in the sealing layer; one end of the manual air exhaust mechanism is fixed to the sealing layer, an air exhaust cavity is formed in the manual air exhaust mechanism, and the air exhaust cavity communicates with the through hole; a one-way structure enabling gas to sequentially pass through the liquid absorption layer and the air exhaust cavity to flow to the outside is further arranged in the manual air exhaust mechanism. Continuous negative pressure is provided through the manual air exhaust mechanism, the negative pressure device has the advantages of being convenient to operate, low in cost, small in size, light in weight, safe to use and the like, the requirement for the technical level of an operator can be lowered, carrying of the negative pressure device and movement of a patient are facilitated, and the comfort of the patient is improved; wound exudate is absorbed through the liquid absorption layer, structures such as a drainage tube, a liquid storage bag or a liquid storage bottle are omitted, and the cost is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a portable negative pressure device. Background Art

[0002] Negative pressure drainage therapy is a treatment method that uses a negative pressure device to extract exudate from the wound to promote wound healing. In negative pressure drainage therapy, the doctor will place a negative pressure closed system around the wound, connected to a negative pressure pump through a pipe. Through continuous negative pressure suction, the exudate in the wound can be effectively removed, the risk of infection can be reduced, and wound healing can be promoted.

[0003] At present, the operation of negative pressure drainage relies on a large negative pressure closed system, which in turn requires professionals to operate and manage. Therefore, the current negative pressure drainage therapy has the following disadvantages: the cost of negative pressure drainage equipment and related consumables is relatively high; negative pressure drainage therapy requires professionals to operate and manage, and has high technical requirements for medical staff; the negative pressure source of existing negative pressure drainage therapy is often a large active product, which is not only heavy, but also restricts the patient's movement during treatment.

[0004] Therefore, there is still a need for a portable negative pressure device suitable for a negative pressure wound therapy system. Utility Model Content

[0005] The utility model aims to provide a portable negative pressure device which is low in cost, small in size, light in weight and easy to operate.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A portable negative pressure device comprises a sealing layer, a liquid absorbing layer and a manual air pumping mechanism;

[0008] A liquid absorption layer is arranged below the sealing layer, and a through hole is arranged on the sealing layer; one end of the manual air pumping mechanism is fixed on the sealing layer, and an air pumping cavity is arranged inside the manual air pumping mechanism, and the air pumping cavity is connected with the through hole; a one-way structure is also arranged inside the manual air pumping mechanism, which allows the gas to flow to the outside through the liquid absorption layer and the air pumping cavity in sequence.

[0009] The utility model provides a liquid absorption layer in the dressing, so that the exudate that should be absorbed in the liquid storage bag or the liquid storage bottle is absorbed in the liquid absorption layer, thereby saving an additional liquid storage device and reducing the size of the device; and, compared with the negative pressure source type negative pressure sealing drainage device with a large volume, by integrating a manual air pumping mechanism on the dressing, the size and weight of the negative pressure sealing drainage device are further reduced, which can facilitate the movement of patients during the negative pressure sealing drainage treatment, improve the portability of the product, and effectively reduce the cost of the device; by setting a one-way mechanism in the manual air pumping mechanism, the gas of the device can flow from the liquid absorption layer to the manual air pumping mechanism after manual air pumping, and it is impossible for external gas to flow into the liquid absorption layer in the reverse direction, thereby achieving effective negative pressure sealing, and at the same time, external gas cannot enter the air pumping cavity, so that the device has a continuous negative pressure drainage effect.

[0010] Further, the manual air pumping mechanism comprises a fixing portion and an air pumping portion which are interconnected, and the air pumping cavity is arranged in the air pumping portion;

[0011] The one-way structure includes a one-way valve 1, and the one-way valve 1 is arranged in the fixing part.

[0012] The one-way valve has a simple structure and ingenious design. On the one hand, it enables the manual vacuum mechanism to make the gas flow from the liquid absorption layer to the manual vacuum mechanism when extracting gas, and prevents the external gas from flowing into the liquid absorption layer in the opposite direction. On the other hand, it acts as a sealing plug. After the vacuum is completed, when there is a negative pressure inside the sealing layer, it continues to block the external gas, ensuring a continuous negative pressure state in the device.

[0013] Furthermore, the air pumping portion is configured as an airbag, and the air pumping cavity is formed in the airbag; the air pumping port of the air pumping cavity is connected to the through hole, and the exhaust port of the air pumping cavity is connected to the outside.

[0014] The airbag is easy to use and operate, and is highly convenient to operate.

[0015] Furthermore, the airbag is a squeeze-type airbag or a push-pull airbag.

[0016] The airbag can be an existing extrusion type or push-pull type airbag, as long as the airbag can achieve deformation of the air pump cavity to form a gas change.

[0017] Furthermore, the fixing portion is configured as a suction cup, and the suction cup is fixedly connected to the sealing layer; the through hole, the suction cup and the air suction port of the air suction cavity are in communication.

[0018] The sealing layer is connected by a suction cup to increase the contact area between the two and make the connection more stable.

[0019] Furthermore, the one-way structure also includes a second one-way valve, and the second one-way valve is arranged at the exhaust port of the air pumping cavity.

[0020] After the vacuum is completed, the one-way valve 2 can continue to block the external gas when the vacuum chamber is under negative pressure, thereby ensuring that the device is in a continuous negative pressure state.

[0021] Furthermore, it also includes a supporting conductive layer, which is arranged between the sealing layer and the lower part of the liquid absorbing layer.

[0022] The supporting conductive layer can increase the deformation space of the device when negative pressure is drawn, and improve the conductivity of wound tissue fluid; at the same time, the supporting conductive layer can also absorb a certain amount of liquid, and increase the overall liquid storage capacity of the device.

[0023] Furthermore, the liquid absorbing layer is provided with a transmission hole, and the transmission hole corresponds to the position of the through hole.

[0024] Providing the transmission hole can prevent the liquid absorption layer 2 from blocking the through hole 111, thereby improving the conductivity of the wound tissue fluid, reducing the resistance of manual negative pressure extraction, and improving the convenience of operation.

[0025] Furthermore, it also includes a contact layer, the sealing layer and the contact layer are adhesively and fixedly connected; the liquid absorption layer is arranged between the sealing layer and the contact layer; the contact layer is a breathable and liquid-permeable medical silicone gel layer.

[0026] The contact layer is provided to facilitate forming the sealing layer and the liquid absorbing layer or the sealing layer, the liquid absorbing layer and the supporting transmission layer of the device into a whole when forming the product, which is convenient for operation and use; the contact layer is a breathable and liquid-permeable medical silicone gel layer, which can prevent the formation of hypertrophic scars and is conducive to the recovery of the wound surface.

[0027] Furthermore, the suction cup is clamped and fixed on the sealing layer.

[0028] The suction cup is fixed on the sealing layer in a detachable manner, which is convenient for replacement and saves device space.

[0029] Beneficial effects of the utility model:

[0030] The utility model provides a portable negative pressure device, which comprises a sealing layer, a liquid absorbing layer and a manual air pumping mechanism;

[0031] A liquid absorption layer is arranged below the sealing layer, and a through hole is arranged on the sealing layer; one end of the manual air pumping mechanism is fixed on the sealing layer, and an air pumping cavity is arranged inside the manual air pumping mechanism, and the air pumping cavity is connected with the through hole; a one-way structure is also arranged inside the manual air pumping mechanism, which allows the gas to flow to the outside through the liquid absorption layer and the air pumping cavity in sequence.

[0032] Compared with the existing negative pressure drainage devices, the present application provides continuous negative pressure through a manual vacuum mechanism, and has the advantages of easy operation, low cost, small size, light weight and safe use. It can reduce the requirements on the technical level of the operator, facilitate the carrying of the negative pressure device and the movement of the patient, and improve the comfort of the patient; the wound exudate is absorbed by the liquid absorption layer, eliminating the drainage tube, liquid storage bag or liquid storage bottle and other structures, thereby further reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 This is a schematic structural diagram of the portable negative pressure device provided in the first embodiment of the utility model when the airbag is of the extrusion type;

[0035] Figure 2 This is a schematic diagram of the structure of the portable negative pressure device provided in the first embodiment of the utility model when the airbag is a push-pull type;

[0036] Figure 3 A schematic diagram of the structure of a portable negative pressure device provided in Embodiment 2 of the present utility model;

[0037] Figure 4 This is a schematic structural diagram of a portable negative pressure device provided in Embodiment 3 of the present utility model.

[0038] icon:

[0039] 1-sealing layer; 111-through hole; 2-liquid absorption layer; 21-transmission hole; 3-manual air pumping mechanism; 31-fixing part; 32-air pumping part; 321-air pumping cavity; 4-one-way valve 1; 5-one-way valve 2; 6-supporting conductive layer; 7-contact layer. DETAILED DESCRIPTION

[0040] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] It should be noted that in the description of the present invention, the terms "connection" and "installation" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or connected through an intermediate medium; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Currently, negative pressure drainage devices have defects such as high cost, large size and high technical requirements for medical staff, which brings a lot of inconvenience to patients' treatment.

[0044] Embodiment 1

[0045] Based on the problems existing in the prior art, the first embodiment of the present invention provides a portable negative pressure device, referring to Figure 1 , the device comprises a sealing layer 1, a liquid absorbing layer 2 and a manual air pumping mechanism 3;

[0046] A liquid absorption layer 2 is arranged below the sealing layer 1, and a through hole 111 is arranged on the sealing layer 1; one end of the manual air pumping mechanism 3 is fixed on the sealing layer 1, and an air pumping cavity 321 is arranged inside the manual air pumping mechanism 3, and the air pumping cavity 321 is connected with the through hole 111; a one-way structure is also arranged inside the manual air pumping mechanism 3, which allows the gas to flow to the outside through the liquid absorption layer 2 and the air pumping cavity 321 in sequence.

[0047] When in use, first, align the absorbent layer 2 with the wound surface, stick or press the sealing layer 1 on the skin at the wound surface, so that the sealing layer 1 covers the top of the absorbent layer 2; then, at least part of the gas in the suction chamber 321 is discharged to the outside through the manual vacuum mechanism 3, so that the suction chamber 321 is in a negative pressure state; at this time, the gas between the sealing layer 1 and the skin continuously enters the suction chamber 321 through the through hole 111 under the suction force of the suction chamber 321, and the space between the sealing layer 1 and the skin is in a negative pressure state, which prompts the absorbent layer 2 located between the sealing layer 1 and the skin to absorb the liquid exuded from the wound surface.

[0048] In the above device, the manual air extraction mechanism 3 is provided with a one-way structure that allows the gas to flow to the outside through the liquid absorption layer 2 and the air extraction cavity 321 in sequence; when part or all of the gas in the air extraction cavity 321 is manually extracted, since the external gas cannot enter the air extraction cavity 321, the gas in the air extraction cavity 321 cannot be replenished, and the inside of the device will continue to have a slight negative pressure. When the above device is in use, it only needs to pump air out of the air extraction cavity 321 once to continuously absorb wound exudates without frequent operation, which is conducive to promoting the healing of the tissue at the bottom of the wound.

[0049] The utility model provides a liquid absorption layer 2 in the dressing, and absorbs the exudate that should be absorbed in the liquid storage bag or the liquid storage bottle in the liquid absorption layer 2, thereby saving an additional liquid storage device and reducing the size of the device; and, compared with the negative pressure source type negative pressure sealing drainage device with a large volume, by integrating a manual air pumping mechanism 3 on the dressing, the size and weight of the negative pressure sealing drainage device are further reduced, which can facilitate the movement of patients during the negative pressure sealing drainage treatment, improve the portability of the product, and effectively reduce the cost of the device; by setting a one-way mechanism in the manual air pumping mechanism 3, the gas of the device can flow from the liquid absorption layer 2 to the manual air pumping mechanism 3 after manual air pumping, and it is impossible for external gas to flow into the liquid absorption layer 2 in the reverse direction, thereby achieving effective negative pressure sealing, and at the same time, external gas cannot enter the air pumping cavity 321, so that the device has a continuous negative pressure drainage effect.

[0050] Compared with the existing negative pressure drainage devices, the present application provides continuous negative pressure through a manual suction mechanism 3, and has the advantages of easy operation, low cost, small size, light weight and safe use. It can reduce the requirements on the technical level of the operator, facilitate the carrying of the negative pressure device and the movement of the patient, and improve the comfort of the patient; the wound exudate is absorbed by the liquid absorption layer 2, eliminating structures such as drainage tubes, liquid storage bags or liquid storage bottles, thereby further reducing costs.

[0051] In this embodiment, the manual air extraction mechanism 3 includes a fixing portion 31 and an air extraction portion 32 which are interconnected, and an air extraction cavity 321 is provided in the air extraction portion 32; wherein:

[0052] The fixing portion 31 is configured as a suction cup, which is fixedly connected to the sealing layer 1; the through hole 111, the suction cup and the air extraction port of the air extraction cavity 321 are connected;

[0053] The air pumping portion 32 is configured as an air bag, and an air pumping cavity 321 is formed in the air bag; the air pumping port of the air pumping cavity 321 is communicated with the through hole 111, and the exhaust port of the air pumping cavity 321 is communicated with the outside.

[0054] In the above structure, the sealing layer 1 is connected by the suction cup to increase the contact area between the two, making the connection more stable. The airbag degassing method is adopted, which is easy to use and operate, and has strong convenience in operation.

[0055] As an optional embodiment, the suction cup is detachably connected or glued to the sealing layer. Exemplarily, the suction cup is clamped on the sealing layer to achieve the purpose of easy replacement and saving device space.

[0056] In other embodiments, the suction cup can also be adsorbed on the sealing layer 1 by magnetic attraction; specifically, a first magnetic component in a ring shape is provided on the sealing layer 1, and the first magnetic component is located at the peripheral position of the through hole 111; a second magnetic component with the same shape and opposite magnetic pole to the first magnetic component is provided on the suction cup, and the second magnetic component is arranged around the air suction port, and a detachable connection between the sealing layer 1 and the airbag is realized by the first magnetic component and the second magnetic component, so that the airbag can be reused.

[0057] As an optional embodiment, the airbag is an extrusion type airbag or a push-pull type airbag, as long as the air suction cavity 321 can be deformed to form a gas change. Figure 1 In the illustrated embodiment, the airbag is a squeeze-type airbag; Figure 2 In the embodiment shown, the airbag is a push-pull airbag. The force application methods of the squeeze airbag and the push-pull airbag are different, but both can achieve changes in internal pressure; among them, the volume of the push-pull airbag can be folded smaller, so the effect of providing negative pressure is better, thereby achieving a better drainage effect.

[0058] In other embodiments, the vacuum portion 32 may also be a hard shell structure, that is, the vacuum chamber 321 does not form gas changes by deformation, but at least part of the gas in the vacuum chamber 321 is manually extracted through tools such as a vacuum pump. This method can also make the vacuum chamber 321 have a continuous negative pressure.

[0059] On the basis of the above structure, the liquid absorbent layer 2 can be connected to the sealing layer 1 by gluing, so that the liquid absorbent layer 2 and the sealing layer 1 become a whole; the liquid absorbent layer 2 may also not be connected to the sealing layer 1. When the sealing layer 1 is adhered to the skin at the patient's wound surface, the sealing layer 1 covers the top of the liquid absorbent layer 2 and the periphery of the sealing layer 1 is adhered to the skin, and the liquid absorbent layer 2 is fixed between the sealing layer 1 and the skin.

[0060] As an optional embodiment, the sealing layer 1 is made of PU film; the sealing layer 1 is a medical film or a transparent film, and the wound surface is sealed by the medical film or the transparent film, which is not easy to leak and improves the drainage effect. The PU film material has the characteristics of light weight and softness, and can better fit the patient's skin, further improving the patient's comfort.

[0061] Optionally, the liquid-absorbing layer 2 is made of foam dressing material, sponge dressing material, or other materials with liquid-absorbing and breathable properties.

[0062] In this embodiment, the one-way structure includes a one-way valve 4, which is arranged in the fixing portion 31. The one-way valve has a simple structure and an ingenious design. On the one hand, it enables the manual air pumping mechanism 3 to make the gas flow from the liquid absorbing layer 2 to the manual air pumping mechanism 3 when the gas is extracted, but cannot flow from the manual air pumping mechanism 3 to the liquid absorbing layer 2 in the reverse direction. On the other hand, it plays the role of a sealing plug. After the air is pumped out, the external gas is continuously blocked when the inside of the sealing layer 1 is under negative pressure, thereby ensuring that the sealing layer 1 is under a continuous negative pressure state.

[0063] In this embodiment, the one-way structure further includes a one-way valve 2 5, which is arranged at the exhaust port of the air extraction chamber 321. The one-way valve 2 5 can continuously block external gas when the air extraction chamber 321 is under negative pressure, thereby ensuring that the device is under continuous negative pressure and improving the service life and adsorption effect of the device.

[0064] Embodiment 2

[0065] Embodiment 2 of the present application provides a portable negative pressure device, which is different from Embodiment 1 in the following aspects:

[0066] Reference Figure 3 In this embodiment, the sealing layer 1 and the contact layer 7 are adhesively fixedly connected; the liquid absorbing layer 2 is arranged between the sealing layer 1 and the contact layer 7; and the contact layer 7 is a gas-permeable and liquid-permeable medical silicone gel layer.

[0067] The device can be adhered to the skin surface through the contact layer 7, which is more convenient to use; the use of the air-permeable and liquid-permeable medical silicone gel layer can prevent the formation of hypertrophic scars and is conducive to the recovery of the wound surface.

[0068] Furthermore, it also includes a supporting conductive layer 6, which is arranged below the liquid absorbing layer 2. The supporting conductive layer 6 can increase the deformation space of the device when the negative pressure is pumped, thereby improving the conductivity of the wound tissue fluid; and the supporting conductive layer 6 plays a supporting role for the device as a whole, avoiding the problem of poor liquid absorption caused by excessive deformation of the sealing layer 1, the liquid absorbing layer 2 and the contact layer 7 under the action of negative pressure, thereby improving the liquid absorption effect of the device; in addition, the supporting conductive layer 6 can absorb a certain amount of liquid, thereby increasing the overall liquid storage capacity of the device.

[0069] In this embodiment, the sealing layer 1 and the contact layer 7 are adhered and fixed, and a space is formed between the two for accommodating the supporting conductive layer 6 and the liquid absorbing layer 2. With the above structure, when forming a product, the sealing layer 1 and the liquid absorbing layer 2 or the sealing layer 1, the liquid absorbing layer 2 and the supporting conductive layer 6 of the device are formed into a whole, which is convenient for operation and use.

[0070] Optionally, a plurality of through holes are provided on the supporting conductive layer 6 or the supporting conductive layer 6 is a hollow structure, which can facilitate the passage of liquid and enable the liquid absorbing layer 2 to smoothly absorb the exudate.

[0071] Optionally, the supporting conductive layer 6 is made of foam, plastic, rubber, metal, etc. Preferably, the supporting conductive layer 6 is made of foam or plastic to minimize the weight of the supporting conductive layer 6. The supporting conductive layer 6 can be manufactured using 3D printing technology to further reduce processing costs.

[0072] The rest of the structure of this embodiment is the same as that of the first embodiment and will not be described again.

[0073] Embodiment 3

[0074] Embodiment 3 of the present application provides a portable negative pressure device, which is different from Embodiment 1 or Embodiment 2 in the following aspects:

[0075] Reference Figure 4 The position of the liquid-absorbing layer 2 corresponding to the through hole 111 is provided with a transmission hole 21. The above arrangement can avoid the phenomenon that the liquid-absorbing layer 2 blocks the through hole 111 under the action of negative pressure, improve the flowability of the gas in the device, and the conductivity of the wound tissue fluid; at the same time, it can also avoid excessive deformation of the liquid-absorbing layer 2 to affect the liquid-absorbing effect, reduce the resistance of manual negative pressure extraction, and improve the convenience of operation.

[0076] In this embodiment, the contact layer 7, the supporting conductive layer 6, the absorbent layer 2 and the sealing layer 1 are stacked in sequence; wherein the periphery of the sealing layer 1 is adhesively connected to the contact layer 7, and the supporting conductive layer 6 and the absorbent layer 2 are arranged between the sealing layer 1 and the contact layer 7; the airbag is connected to the sealing layer 1 through a suction cup, and after squeezing the airbag, there is a continuous mild negative pressure inside the device, so that the absorbent layer 2 can continuously absorb wound exudates.

[0077] The rest of the structure of this embodiment is the same as that of the first or second embodiment, and will not be described again here.

[0078] Embodiment 4

[0079] Embodiment 4 of the present application provides a portable negative pressure device, which is different from Embodiment 2 or Embodiment 3 in the following aspects:

[0080] In this embodiment, the negative pressure device is not provided with a contact layer 7; a supporting conductive layer 6, a liquid absorbing layer 2 and a sealing layer 1 are provided in sequence. When in use, the periphery of the sealing layer 1 is adhered to the skin around the wound, and the sealing layer 1 covers the liquid absorbing layer 2 and the supporting conductive layer 6.

[0081] The remaining structures of this embodiment are the same as those of the second or third embodiment and will not be described again.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A portable negative pressure device, characterized in that: It comprises a sealing layer (1), a liquid absorbing layer (2) and a manual air extraction mechanism (3); A liquid absorption layer (2) is arranged below the sealing layer (1), and a through hole (111) is arranged on the sealing layer (1); one end of the manual air pumping mechanism (3) is fixed on the sealing layer (1), and an air pumping cavity (321) is arranged inside the manual air pumping mechanism (3), and the air pumping cavity (321) is connected to the through hole (111); a one-way structure is also arranged inside the manual air pumping mechanism (3) so that gas can flow to the outside through the liquid absorption layer (2) and the air pumping cavity (321) in sequence.

2. The portable negative pressure device according to claim 1, characterized in that: The manual air extraction mechanism (3) comprises a fixing portion (31) and an air extraction portion (32) which are interconnected, and the air extraction cavity (321) is provided in the air extraction portion (32); The one-way structure comprises a one-way valve (4), and the one-way valve (4) is arranged in the fixing portion (31).

3. The portable negative pressure device according to claim 2, characterized in that: The air pumping portion (32) is configured as an air bag, and the air pumping cavity (321) is formed in the air bag; the air pumping port of the air pumping cavity (321) is connected to the through hole (111), and the exhaust port of the air pumping cavity (321) is connected to the outside.

4. The portable negative pressure device according to claim 3, characterized in that: The airbag is a squeeze type airbag or a push-pull type airbag.

5. The portable negative pressure device according to claim 3, characterized in that: The fixing portion (31) is configured as a suction cup, and the suction cup is fixedly connected to the sealing layer (1); the through hole (111), the suction cup and the suction port of the suction cavity (321) are in communication.

6. The portable negative pressure device according to claim 3, characterized in that: The one-way structure further comprises a second one-way valve (5), and the second one-way valve (5) is arranged at the exhaust port of the air pumping cavity (321).

7. The portable negative pressure device according to claim 1, characterized in that: It also comprises a supporting conductive layer (6), wherein the supporting conductive layer (6) is arranged below the liquid absorbing layer (2).

8. The portable negative pressure device according to claim 7, characterized in that: The liquid absorbing layer (2) is provided with a transmission hole (21), and the position of the transmission hole (21) corresponds to that of the through hole (111).

9. The portable negative pressure device according to any one of claims 1 to 8, characterized in that: It also comprises a contact layer (7), the sealing layer (1) and the contact layer (7) being adhesively fixedly connected; the liquid absorbing layer (2) is arranged between the sealing layer (1) and the contact layer (7); and the contact layer (7) is a gas-permeable and liquid-permeable medical silicone gel layer.

10. The portable negative pressure device according to claim 5, characterized in that: The suction cup is clamped and fixed on the sealing layer (1).

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