Application

Abstract

The application comprises a bottom layer, a liquid absorption layer and an isolation layer which are sequentially arranged in a stacked mode, the bottom layer is provided with an inner surface facing the liquid absorption layer, an outer surface opposite to the inner surface and a plurality of through holes penetrating through the inner surface and the outer surface, and a plurality of micron-sized protrusions are arranged on the outer surface at intervals. The liquid absorption layer is a hydrophilic layer with super hydrophilicity, and the bottom layer and the isolation layer are hydrophobic layers. According to the application, a good healing environment can be provided, and the application is easy to strip from a wound surface.

Description

Technical Field

[0001] This utility model relates to a dressing. Background Technology

[0002] With the development of modern medical technology, people have gradually realized in recent years that wound healing is closely related to the environment in which the wound is located. Keeping the wound in a moist environment with an appropriate amount of exudate secreted by the wound is conducive to wound healing.

[0003] Existing medical dressings are typically composed of hydrophilic materials such as traditional gauze, bandages, and cotton, and are applied to the wound for drainage and other purposes. To maintain wound cleanliness or for dressing changes, dressings usually need to be replaced periodically. However, traditional medical dressings are highly absorbent and relatively dry, generally failing to provide a suitable moist environment for the wound, thus affecting the healing speed. They also tend to adhere to the wound, potentially causing repeated tissue damage (secondary injury) when removed. Furthermore, dressing fibers can easily detach and remain on the wound during removal, potentially causing a foreign body reaction and hindering wound healing. Therefore, a dressing that can keep the wound surface moist is needed. However, since exudate also contains inflammatory mediators and bacteria, excessive exudate accumulating on the wound surface for extended periods can lead to dead space (cavities primarily composed of necrotic tissue), wound infection, and other complications, hindering wound healing.

[0004] Therefore, there is a need for a dressing that can provide a good healing environment and is easy to peel off from the wound surface. Summary of the Invention

[0005] In view of the above-mentioned existing conditions, the present invention aims to provide a dressing that can provide a good healing environment and is easy to peel off from the wound.

[0006] Therefore, this utility model provides a dressing comprising a bottom layer, an absorbent layer, and a release layer stacked sequentially. The bottom layer has an inner surface facing the absorbent layer, an outer surface opposite to the inner surface, and a plurality of through holes penetrating the inner surface and the outer surface. The outer surface has a plurality of micron-sized protrusions arranged at intervals. The absorbent layer is a hydrophilic layer with superhydrophilicity, and the bottom layer and the release layer are hydrophobic layers.

[0007] In this invention, the bottom layer and the isolation layer are hydrophobic layers, and the absorbent layer is a superhydrophilic hydrophilic layer. The bottom layer has multiple through-holes penetrating its inner and outer surfaces, and micron-sized protrusions on its outer surface. By providing multiple micron-sized protrusions on the outer surface of the bottom layer, the outer surface becomes superhydrophobic. When the dressing is applied to the wound, the area of ​​the wound corresponding to the through-holes is called the first area, and the area of ​​the wound corresponding to the non-perforated area on the outer surface of the bottom layer (i.e., the area with micron-sized protrusions) is called the second area. Through the absorption of excess exudate from the wound by the absorbent layer, the through-holes and the first area remain dry. The superhydrophobic outer surface of the bottom layer allows at least part of the exudate secreted by the wound to be retained between the outer surface and the second area, thus ensuring the second area remains dry. The two areas are in a moist tissue contact environment. Together, they can effectively avoid the adverse effects of dead space on wound healing and provide a good healing environment for the wound. When it is necessary to remove the dressing from the wound, because the second area is in a moist environment, the superhydrophobic properties of the bottom layer surface in contact with the wound (i.e., the outer surface) can prevent adhesion to wound secretions and granulation tissue on the wound surface. This reduces the adhesion between the outer surface and the newly formed granulation tissue, making it easier to remove from the wound and thus avoiding secondary damage to the wound. Moreover, the dressing fibers are not easy to fall off, which can effectively reduce the foreign body reaction of the wound. In addition, the isolation layer can effectively resist the entry of contaminants from the external environment into the dressing, acting as a barrier and reducing the risk of wound infection.

[0008] Furthermore, in the dressings involved in this invention, the micron-sized protrusions may optionally be papillary, conical, or columnar, and the height of the micron-sized protrusions may be between 20 μm and 150 μm. In this case, it is beneficial to improve the hydrophobic properties of the outer surface, thereby helping to maintain the second region in a moist environment and facilitating peeling.

[0009] Furthermore, in the dressing of this invention, optionally, the plurality of micron-sized protrusions are arranged in an array, and the distance between two adjacent micron-sized protrusions is 20 μm to 200 μm. In this case, the hydrophobic properties are relatively uniform throughout the outer surface. When the dressing is applied to the wound, the thickness of the liquid layer formed by the exudate held between the second region and the outer surface is generally consistent, thereby ensuring that the healing speed of the second region is basically uniform, which is beneficial to wound healing.

[0010] Additionally, in the dressing according to this invention, optionally, the diameter of the through-hole is 0.5 mm to 3 mm, and the distance between two adjacent through-holes is 1 mm to 5 mm. In this case, it is convenient for the absorbent layer to absorb the exudate from the wound through the through-hole.

[0011] Furthermore, in the dressing according to this invention, optionally, nanoparticles in the form of spherical, conical, columnar, or irregular three-dimensional shapes are provided on the surface of the micron-sized protrusions. This can help improve the hydrophobic properties of the outer surface, thereby facilitating the maintenance of a moist environment and making it easy to peel off.

[0012] In addition, in the dressing of this invention, optionally, a plurality of micron-sized protrusions are provided at intervals on the surface of the isolation layer facing the absorbent layer and on the surface opposite to the isolation layer. In this case, both sides of the isolation layer are superhydrophobic, which can further inhibit the evaporation of exudate located in the absorbent layer, thus providing a suitable moist environment. Furthermore, it can further resist contaminants in the external environment, especially substances (especially liquids) carrying bacteria / pathogens, from entering the dressing and moving to the wound, reducing the risk of wound infection.

[0013] Alternatively, in the dressing according to this invention, the plurality of through holes may be arranged in an array. In this case, the unperforated areas on the outer surface are also evenly distributed, thereby facilitating peeling.

[0014] In addition, in the dressings involved in this utility model, optionally, the materials of the bottom layer and the release layer are silicone. In this case, the bottom layer and the release layer are soft and have good biocompatibility and breathability, are non-irritating to human tissue, and can promote wound healing.

[0015] Additionally, the dressing according to this invention may optionally include a protective film that can be peeled off to cover the outer surface. In this case, by providing the protective film, the outer surface can be kept clean before use, and when the dressing needs to be applied to the wound surface, the protective film can be peeled off from the outer surface.

[0016] Furthermore, in the dressings involved in this invention, optionally, the bottom layer, the absorbent layer, and the release layer are sheet-like. This facilitates the coverage of the wound.

[0017] According to the present invention, a dressing that provides a good healing environment and is easy to peel off from the wound can be provided. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating a first embodiment of the dressing according to an example of the present invention.

[0019] Figure 2 It shows Figure 1 The diagram shows a cross-sectional view of the dressing.

[0020] Figure 3 It showsFigure 1 The diagram shows a split view of the dressing from a first-person perspective.

[0021] Figure 4 It shows Figure 1 The diagram shows a split view of the dressing from a second perspective.

[0022] Figure 5 This is a schematic diagram illustrating the micron-scale protrusions and nanoparticles involved in an example of this utility model.

[0023] Figure 6 This is a schematic diagram illustrating a second embodiment of the dressing according to an example of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1… dressing, 10… bottom layer, 11… inner surface, 12… outer surface, 13… through hole, 121… micron-sized protrusion, 122… nanoparticle, 20… absorbent layer, 30… isolation layer, 40… protective film, 50… second protective film, 9… wound surface, 90… exudate layer, S1… first region, S2… second region. Detailed Implementation

[0026] All references cited in this invention are incorporated herein by reference in their entirety, as fully explained herein. Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0027] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, the same reference numerals are used for the same parts, and repeated descriptions are omitted. Furthermore, the drawings are merely schematic diagrams, and the proportions of the parts or the shapes of the parts may differ from the actual figures.

[0028] This utility model relates to a dressing for protecting wounds. The dressing of this utility model can also be called a medical dressing, medical dressing, etc. In this utility model, a wound is damage caused by injury to normal skin (tissue), such as burns, abrasions, cuts, sprains, ulcers, frostbite, etc. A wound can also be called a sore or trauma. When the dressing of this utility model is applied to a wound, it can absorb excess exudate, provide a suitable moist environment for the wound, and is easy to peel off, reducing secondary damage to the wound during removal.

[0029] In this invention, providing a suitable moist environment / healing environment for the wound means that the dressing of this invention can keep the wound moist but not soaked in liquid.

[0030] The following description, in conjunction with the accompanying drawings, will explain the dressing material involved in this utility model.

[0031] Figure 1 This is a schematic diagram illustrating a first embodiment of the dressing 1 according to an example of the present invention. Figure 2 It shows Figure 1 A schematic cross-sectional view of the dressing 1 shown. Figure 3 It shows Figure 1 The diagram shows a split view of the dressing 1 from a first-person perspective. Figure 4 It shows Figure 1 A second-view schematic diagram of the split structure of the dressing 1 is shown. Figure 2 In the diagram, the arrows schematically indicate the direction of exudate movement. Additionally, it should be noted that the first perspective is a downward-sloping view, and the second perspective is an upward-sloping view.

[0032] In some examples, the dressing 1 may include a bottom layer 10, an absorbent layer 20, and an isolation layer 30 stacked sequentially (see [reference]). Figure 1 The bottom layer 10 and the isolation layer 30 can be hydrophobic layers, and the absorbent layer 20 can be a hydrophilic layer with superhydrophilicity. When the dressing 1 is applied to the wound 9, the bottom layer 10 can come into contact with the wound 9, and the absorbent layer 20 can be used to absorb the exudate secreted by the wound 9.

[0033] In some examples, the bottom layer 10 may have an inner surface 11 facing the absorbent layer 20, an outer surface 12 opposite to the inner surface 11, and a plurality of through holes 13 penetrating the inner surface 11 and the outer surface 12 (see [reference]). Figure 2 The absorbent layer 20 can absorb the exudate secreted by the wound 9 through the through-hole 13.

[0034] In some examples, the outer surface 12 may have a plurality of spaced-apart micron-sized protrusions 121 (described later). This enables the outer surface 12 to possess superhydrophobicity. In this invention, superhydrophobicity refers to a surface with a micro-droplet contact angle greater than 150° and a roll-off angle less than 10°. That is, by providing micron-sized protrusions 121 on the outer surface 12, the micro-droplet contact angle of the outer surface 12 can be made greater than 150° and the roll-off angle less than 10°.

[0035] In some examples, when the dressing 1 is applied to the wound 9, the area of ​​the wound 9 corresponding to the through-hole 13 is referred to as the first region S1, and the area of ​​the wound 9 corresponding to the non-perforated area on the outer surface 12 (and the area with micron-sized protrusions 121) is referred to as the second region S2. See [reference needed]. Figure 2 The first region S1 and the second region S2 are schematically marked.

[0036] In some examples, when the dressing 1 is applied to the wound 9, the absorbent layer 20 can absorb the exudate on the first region S1 through the through-hole 13, keeping the first region S1 and the through-hole 13 dry. Through the superhydrophobic outer surface 12 of the bottom layer 10, some exudate can be retained between the outer surface 12 and the second region S2, keeping the second region S2 in a moist tissue contact environment. This can effectively avoid the adverse effects of dead space on wound healing and provide a good healing environment for the wound 9. When it is necessary to remove the dressing 1 from the wound 9, since the second region S2 is in a moist environment, the superhydrophobic properties of the surface of the bottom layer 10 in contact with the wound (i.e., the outer surface 12) can make it exhibit anti-adhesion properties against wound secretions and granulation tissue on the wound surface. This can reduce the adhesion between the outer surface 12 and the newly formed granulation tissue of the wound, making it easy to remove from the wound 9, thereby avoiding secondary damage to the wound. Moreover, the dressing fibers are not easy to fall off, which can effectively reduce the foreign body reaction of the wound.

[0037] In some examples, the through-hole 13 can be cylindrical. That is, the diameter of the through-hole 13 is the same on the inner surface 11 and the outer surface 12. In this case, the liquid-absorbing layer 20 can easily absorb liquid from the target surface through the through-hole 13.

[0038] In some examples, the diameter of the through-hole 13 can be from 0.5 mm to 3 mm. In this case, the absorbent layer 20 can easily absorb the exudate through the through-hole 13 (see...). Figure 2 The arrows schematically indicate the direction of exudate movement.

[0039] In some examples, the spacing between two adjacent through holes 13 can be from 1 mm to 5 mm. In some examples, multiple through holes 13 can be arranged in an array (see...). Figure 4 In this case, the unperforated areas on the outer surface 12 are also evenly distributed, which facilitates peeling.

[0040] Figure 5 This is a schematic diagram showing the micron-sized protrusions 121 and nanoparticles 122 involved in an example of this utility model. It should be noted that... Figure 5 yes Figure 1 An enlarged view of region A in the image.

[0041] In some examples, as described above, a plurality of micron-sized protrusions 121 are provided on the outer surface 12 (see Figure 5Understandably, the micron-sized protrusions 121 are located in non-perforated areas on the outer surface 12. In this case, by providing multiple micron-sized protrusions 121 on the outer surface 12 of the base layer 10, the outer surface 12 can be made superhydrophobic, and when the dressing 1 is applied to the wound 9, a liquid layer 90 composed of exudate secreted by the wound 9 is formed between the outer surface 12 of the base layer 10 and the wound 9 (see...). Figure 2 This keeps the wound 9 in a moist tissue contact environment, which is conducive to promoting the healing of the wound 9. When it is necessary to remove the dressing 1 from the wound 9, the presence of the liquid layer 90 can reduce the adhesion between the outer surface 12 and the newly formed granulation tissue of the wound, thus making it easier to remove the dressing 1 from the wound 9.

[0042] In some examples, the micron-sized protrusions 121 can be papillary, conical, or columnar.

[0043] In some examples, the height of the micron-sized protrusions 121 ranges from 20 μm to 150 μm. In this case, it is beneficial to improve the hydrophobicity of the outer surface 12, thereby helping to maintain a moist environment and facilitating peeling.

[0044] In some examples, the micron-sized protrusions 121 can be arranged in an array (see...). Figure 5 ).

[0045] In some examples, the spacing between two adjacent micron-sized protrusions 121 can be from 20 μm to 200 μm. In this case, the hydrophobic properties are relatively uniform throughout the outer surface 12, which allows the thickness of the liquid layer 90 formed by the liquid held between the second region S2 and the outer surface 12 to be approximately consistent, thereby making the healing speed of the second region S2 basically consistent and conducive to the healing of the wound 9.

[0046] In some examples, nanoparticles 122 may be provided on the surface of the micron-scale protrusion 121 (see Figure 5 In some examples, the nanoparticles 122 can be spherical, conical, columnar, or irregularly shaped. This can help to further improve the hydrophobic properties of the outer surface 12, thereby facilitating the maintenance of a moist environment and making it easy to peel off.

[0047] In some examples, the particle size of nanoparticles 122 can range from 50 nm to 1000 nm. It should be noted that the particle size range refers to the diameter when nanoparticles 122 are spherical, and to the equivalent diameter in their three-dimensional structure when the shape is not spherical.

[0048] In some examples, the number of nanoparticles 122 can be multiple, and the particle sizes of the multiple nanoparticles 122 can be the same or different (see [reference]). Figure 5 ).

[0049] In this invention, the multiple micron-sized protrusions 121, arranged at intervals and having nanoparticles 122 on their surface, can be referred to as micro / nano structures or superhydrophobic structures. That is, micro / nano structures can be provided on the outer surface 12. The contact angle of the micro-water droplets on the outer surface 12 with micro / nano structures can be greater than 150°, and the roll-off angle less than 10°. In this case, by providing micro / nano structures on the outer surface 12, the outer surface 12 can be made superhydrophobic, thereby helping to maintain a moist environment between the outer surface 12 and the wound 9, and facilitating the removal of the dressing 1 from the wound 9.

[0050] It should be noted that, due to the limitations of existing processing methods, when “carving” micron-sized protrusions 121 and / or nanoparticles 122 on the outer surface 12 using methods such as laser processing, the resulting micron-sized protrusions 121 and / or nanoparticles 122 may not be able to form completely regular shapes at the microscopic level. As long as they form a papillary structure with a certain height and a relatively regular outline, they can play a hydrophobic role.

[0051] In some examples, the micro / nanostructure can be integrally formed with the outer surface 12. In some examples, the material of the micro / nanostructure can be the same as the material of the bottom layer 10. That is, the micro / nanostructure can be directly etched onto the outer surface 12 by means of, for example, laser processing. In this case, it is convenient to fabricate the bottom layer 10 with the micro / nanostructure.

[0052] In some examples, the thickness of the bottom layer 10 can be from 0.1 mm to 2 mm. It should be noted that the thickness of the bottom layer 10 includes the thickness of the micron-sized protrusions 121 and the nanoparticles 122. In this case, the bottom layer 10 is of moderate thickness, maintaining good breathability while also facilitating the absorption layer 20 to absorb exudate from the wound surface 9 through the through-holes 13. In some examples, preferably, the thickness of the bottom layer 10 can be from 0.1 mm to 1 mm.

[0053] In some examples, the bottom layer 10 can be made of a hydrophobic material. In other words, the bottom layer 10 can be hydrophobic. That is, the contact angle on the inner surface 11 and the through-hole 13 of the bottom layer 10 can be greater than 90°. In this case, it is easy to maintain a moist environment between the outer surface 12 and the wound 9.

[0054] For example, in some cases, the material of the bottom layer 10 can be silicone. That is, the bottom layer 10 can be a silicone rubber film, also known as a PDMS (polydimethylsiloxane) film. In this case, the bottom layer 10 is soft and has good biocompatibility and breathability, is non-irritating to human tissue, and can promote wound healing.

[0055] In some examples, the absorbent layer 20 can absorb liquid. In some examples, the liquid absorbed by the absorbent layer 20 can adhere to the absorbent layer 20, that is, the liquid absorbed by the absorbent layer 20 can remain in the absorbent layer 20 without spreading outward.

[0056] In this situation, the liquid on the first region S1 corresponding to the through-hole 13 on the target surface can be absorbed by the absorbent layer 20 through the through-hole 13, and the liquid in the through-hole 13 can also be absorbed by the absorbent layer 20, thereby keeping the first region S1 and the through-hole 13 dry. This can suppress adverse effects on wound healing, such as dead space, and provide a good healing environment for wound healing 9. Those skilled in the art will understand that keeping the first region S1 and the through-hole 13 dry can refer to a relatively dry environment; specifically, under normal circumstances, the absorbent layer 20 can absorb exudate to keep the first region S1 and the through-hole 13 dry. It should be noted that in some cases, due to the spacing of the bottom layer 10, the first region S1 does not contact the absorbent layer 20, and some liquid on the surface of the first region S1 (e.g., some liquid on the first region S1 not within the through-hole 13) may not be absorbed by the absorbent layer 20 in time. As this portion of liquid increases and flows towards the vicinity of the through-hole 13, it will still be absorbed by the absorbent layer 20. This situation also falls within the scope of "keeping the first region S1 and the through hole 13 dry" mentioned in this utility model. In other words, the adsorption of the liquid absorption layer 20 can at least maintain the dry environment inside the through hole 13.

[0057] In other words, in this invention, the absorbent layer 20 can maintain the wetness of the wound surface and effectively avoid the adverse effects of dead space on wound healing. Furthermore, in this invention, the absorbent layer 20 can absorb excess exudate, keeping the wound 9 moist but not soaked in liquid, thus providing a good healing environment for the wound 9.

[0058] In some examples, the absorbent layer 20 may comprise a hydrophilic material. This makes the absorbent layer 20 hydrophilic. In some examples, the absorbent layer 20 may also comprise highly hydrophilic fibers. For example, in some examples, the material of the absorbent layer 20 may comprise sodium carboxymethyl cellulose. In this case, both the hydrophilicity of the absorbent layer 20 and its water retention effect can be improved.

[0059] In some examples, the absorbent layer 20 may also include cotton wool. In some examples, the absorbent layer 20 may be a sponge sheet, a mesh nonwoven fabric, or a medical cotton pad containing cotton wool. In this case, the absorbent layer 20 has high hydrophilicity and a soft texture, which can absorb excess exudate, thereby providing a good healing environment for the wound 9.

[0060] In some examples, the absorbent layer 20 can be superhydrophilic. That is, the contact angle between the water droplet and the absorbent layer 20 is close to 0°, and the absorbent layer 20 is easily wetted. In this case, the absorbent layer 20 can easily absorb excess exudate on the wound 9, and the exudate can easily diffuse inside the absorbent layer 20 after entering it, which is beneficial to improving the absorbency of the absorbent layer 20.

[0061] In some examples, the thickness of the absorbent layer 20 can be from 0.5 mm to 5 mm. In this case, the absorbent layer 20 has good breathability and absorbency, which is conducive to providing a good healing environment, and by setting the thickness of each functional layer, the dressing 1 as a whole can have good mechanical strength. In some examples, preferably, the thickness of the absorbent layer 20 can be from 1 mm to 1.5 mm. In this case, the overall breathability of the dressing 1 can be further optimized while maintaining good absorbency.

[0062] In some examples, the interior of the absorbent layer 20 may have different absorbencies.

[0063] For example, in some examples, the absorbency of the absorbent layer 20 can gradually increase from the lower surface relatively close to the bottom layer 10 to the upper surface relatively close to the insulating layer 30. For ease of description, the portion of the absorbent layer 20 relatively close to the insulating layer 30 is referred to as the upper layer, and the portion relatively close to the bottom layer 10 is referred to as the lower layer (this does not mean that the absorbent layer 20 of this invention only includes two distinct layers). In the early stages of wound formation, wound 9 secretes a significant amount of exudate. In this case, when dressing 1 is applied to wound 9 in its early stages, the exudate from wound 9 moves through the through-hole 13 to the lower layer of absorbent layer 20 and is absorbed by the lower layer. Compared to absorbent layer 20, which has the same absorbency in both the upper and lower layers, in this example, the upper layer of absorbent layer 20 has a higher absorbency than the lower layer. Most of the exudate located in the lower layer tends to diffuse towards the upper layer, with only a small portion spreading laterally within the lower layer. At this time, the unsaturated lower layer continues to rapidly absorb the exudate in the first region S1 and through-hole 13. Thus, excess exudate on wound 9 can be rapidly absorbed by absorbent layer 20, and the relatively low hydrophilicity of the lower layer helps to form an air cavity that separates the liquid from the wound, providing a good healing environment for wound 9 in its early stages.

[0064] In other examples, the absorbency of the absorbent layer 20 may gradually increase from the upper surface relatively close to the isolation layer 30 to the lower surface relatively close to the bottom layer 10. In the middle and late stages of wound formation, the wound 9 secretes less exudate, and some areas of the wound 9 may have already formed scabs. In this case, the lower layer of the absorbent layer 20 has stronger absorbency than the upper layer. When the dressing 1 is applied to the wound 9 in the middle and late stages, the exudate on the wound 9 is absorbed by the lower layer of the absorbent layer 20 through the pores 13. Most of the exudate in the lower layer tends to diffuse laterally within the lower layer, thus keeping most of the exudate in the lower layer of the absorbent layer 20. This allows the first area S1 on the wound 9 to be in a moist ambient air state, thereby providing a good healing environment for the wound 9 in the middle and late stages.

[0065] In some examples, the early stage of wound appearance may refer to the first three days after wound appearance, while the middle and late stages may refer to the period after three days after wound appearance. Of course, it should be noted that due to the different physical conditions of each patient, even after the same amount of time, the degree of healing of wound 9 may vary, and different configurations of the absorbent layer 20 may be selected based on the amount of exudate secreted from the wound.

[0066] In some examples, the portions of the absorbent layer 20 with different absorbency can be made of different materials or have different structures. This allows for different absorbency levels within the absorbent layer 20.

[0067] In some examples, the isolation layer 30 may include a hydrophobic material. This makes the isolation layer 30 hydrophobic. In this case, the isolation layer effectively prevents contaminants from the external environment from entering the dressing 1, acting as a barrier and reducing the risk of infection of the wound 9.

[0068] In some examples, the surface of the isolation layer 30 facing the absorbent layer 20 and the surface opposite to it are provided with a plurality of spaced-apart micron-sized protrusions 121. In this case, the hydrophobicity of the two surfaces of the isolation layer 30 can be enhanced, thereby inhibiting the evaporation of exudate located in the absorbent layer 20 and helping to provide a suitable moist environment for the wound 9; in addition, it can effectively resist contaminants in the external environment, especially substances (especially liquids) that may carry bacteria, from entering the dressing 1 and moving to the wound 9, reducing the risk of infection of the wound 9.

[0069] In some examples, the thickness of the isolation layer 30 can be from 0.2 mm to 1 mm. In this case, the isolation layer 30 can have good breathability, providing a good healing environment for the wound 9. In some examples, preferably, the thickness of the isolation layer 30 can be from 0.2 mm to 0.5 mm. In this case, the breathability of the isolation layer 30 can be further improved while still acting as a barrier.

[0070] In some examples, the material of the isolation layer 30 can be silicone. In this case, the isolation layer 30 is soft and has good breathability, providing a good healing environment for the wound 9.

[0071] In some examples, the base layer 10, the absorbent layer 20, and the isolation layer 30 can be sheet-like. That is, the dressing 1 can be sheet-like. In this case, it is convenient to cover the wound 9.

[0072] In some examples, the dressing 1 can be in the form of a long roll. When using it, the dressing 1 can be cut to the desired size (e.g., a shape that can cover the wound 9) before use.

[0073] In some examples, the length and width of the dressing 1 can be 20mm to 120mm. In this case, it can be adapted to small wounds 9 and is easy to carry. The present invention is not limited thereto, and the size of the dressing 1 can also be adjusted according to actual needs. For example, when the area of ​​the wound 9 is large, a dressing 1 that can cover the size of the wound 9 can be used to protect it.

[0074] In some examples, the dressing 1 can be applied to the wound 9 using medical tape. Alternatively, both ends of the isolation layer 30 can be extended outward (not shown), and the inner walls of the outward-extending ends of the isolation layer 30 can be provided with adhesive, thus forming a band-aid, thereby enabling the dressing 1 to be applied to the wound 9.

[0075] Figure 6 This is a schematic diagram illustrating a second embodiment of the dressing 1 according to an example of the present invention.

[0076] In some examples, the dressing 1 also includes a protective film 40 that peels off the outer surface 12 (see [link]). Figure 6 In this case, by setting the protective film 40, the outer surface 12 can be kept clean before use. When it is necessary to apply the dressing 1 to the wound 9, the protective film 40 can be peeled off from the outer surface 12.

[0077] In some examples, the shape of the protective film 40 may be consistent with the shape of the underlying layer 10. For example, in embodiments where the underlying layer 10 is sheet-like, the protective film 40 may also be sheet-like, and the area of ​​the sheet-like protective film 40 is not less than the area of ​​the outer surface 12 of the underlying layer 10.

[0078] In some examples, the dressing 1 also includes a second protective film 50 that peelably covers the surface of the release layer 30 that is relatively distant from the absorbent layer 20 (see [link]). Figure 6 In this case, by setting the second protective film 50, the surface of the isolation layer 30 that is relatively far from the absorbent layer 20 can be kept clean before use. When the dressing 1 needs to be applied to the wound 9, the second protective film 50 can be peeled off from the surface without affecting the breathability of the isolation layer 30.

[0079] In some examples, the protective film 40 and / or the second protective film 50 can be release paper. This allows for effective protection.

[0080] According to the present invention, a dressing 1 can be provided that can be used to protect a wound 9, provide a moist tissue contact environment for the wound 9, and is easy to peel off from the wound 9.

[0081] Although the present invention has been specifically described above in conjunction with the accompanying drawings and embodiments, it is to be understood that the above description does not limit the present invention in any way. Those skilled in the art can make modifications and variations to the present invention as needed without departing from the essential spirit and scope of the present invention, and all such modifications and variations fall within the scope of the present invention.

Claims

1. A dressing, characterized in that: The device comprises a bottom layer, an absorbent layer, and an isolation layer stacked sequentially. The bottom layer has an inner surface facing the absorbent layer, an outer surface opposite the inner surface, and multiple through-holes penetrating the inner and outer surfaces. A micro / nano structure is provided on the outer surface to make it superhydrophobic. The micro / nano structure includes multiple micron-sized protrusions spaced apart on the outer surface. Nanoparticles are provided on the surface of the micron-sized protrusions, and the micro / nano structure is integrally formed with the outer surface. The absorbent layer is a hydrophilic layer with superhydrophilic properties, and the bottom layer and the isolation layer are hydrophobic layers. The bottom layer is made of PDMS. The height of the micron-sized protrusions is 20 μm to 150 μm, the spacing between two adjacent micron-sized protrusions is 20 μm to 200 μm, and the particle size range of the nanoparticles is 50 nm to 1000 nm.

2. The dressing as described in claim 1, characterized in that: The diameter of the through hole is 0.5 mm to 3 mm, and the distance between two adjacent through holes is 1 mm to 5 mm.

3. The dressing as described in claim 1, characterized in that: The multiple through holes are arranged in an array.

4. The dressing as described in claim 1, characterized in that: The material of the isolation layer is silicone.

5. The dressing as described in claim 1, characterized in that: It also includes a protective film that can be peeled off and covers the outer surface.

6. The dressing as described in claim 1, characterized in that: The bottom layer, the liquid-absorbing layer, and the isolation layer are sheet-like.

Images