An antibacterial superabsorbent wound dressing

Abstract

The present application relates to the technical field of wound dressings, and particularly relates to an antibacterial super-absorption wound dressing, comprising a polyurethane waterproof and breathable bacteria-resistant film, a second non-woven fabric, a super-absorption core layer, a first non-woven fabric, an antibacterial modified fiber non-woven fabric and a silicone gel paste fixing layer which are sequentially stacked. The super-absorption core layer is sealed and wrapped by the first and second non-woven fabrics on all sides to form an envelope structure, so as to prevent leakage of the core material, and the first non-woven fabric is a hydrophilic layer. The antibacterial modified fiber non-woven fabric is made of gel antibacterial fibers loaded with antibacterial agents and reinforcing fibers. The present application avoids reverse osmosis by means of the hydrophilic layer for flow guiding and the core layer for strong liquid locking; the antibacterial layer forms a gel to prevent adhesion and uniformly guide liquid when meeting liquid, thereby avoiding local compression; a specific degree of substitution ensures long-acting antibacterial and avoids gel blocking, and the antibacterial super-absorption wound dressing has the properties of safe leakage prevention, liquid absorption and water locking, adhesion prevention and air permeability, and promotes wound healing.

Description

Technical Field

[0001] This invention relates to the technical field of wound dressings, and more particularly to an antibacterial superabsorbent wound dressing. Background Technology

[0002] Wound dressings are core medical materials in clinical wound care, primarily used to cover wounds, absorb wound exudate, prevent bacterial infection, and provide favorable conditions for wound healing by maintaining a stable wound microenvironment. With increasing clinical demands, ideal wound dressings not only need excellent exudate absorption and retention capabilities, but also require long-lasting antibacterial properties, anti-adhesion properties, high breathability, and good structural stability to meet the diverse nursing needs of complex wounds (such as chronic ulcers, burns, and postoperative incisions).

[0003] Currently available wound dressings can be mainly divided into the following categories: First, ordinary absorbent dressings, which are mainly made of ordinary cotton fibers or single-layer non-woven fabrics, rely on physical absorption to handle exudate; second, antibacterial silicone gel foam dressings, represented by companies such as Mepilex BorderAg (Sweden), Allevyn Gentle Border Ag (UK), and Biatain Ag (Denmark), which add antibacterial components to the foam layer and use a silicone gel contact layer to achieve anti-adhesion; and third, superabsorbent dressings that use superabsorbent polymer (SAP) or superabsorbent fiber (SAF) as the core, which are used to treat wounds with medium to high exudate volumes.

[0004] However, existing wound dressings generally suffer from insufficient absorbency and retention, easy adhesion to the wound surface, easy shedding and leakage of the superabsorbent core material, and difficulty in simultaneously achieving both breathability and adhesive stability. Summary of the Invention

[0005] The purpose of this invention is to provide an antibacterial superabsorbent wound dressing to solve the technical problems of existing wound dressings, such as insufficient liquid absorption and retention capacity, easy adhesion to the wound surface, easy scattering and leakage of the superabsorbent core material, and difficulty in simultaneously achieving air permeability and adhesive fixation stability.

[0006] In a first aspect, the present invention provides an antibacterial superabsorbent wound dressing, comprising a polyurethane waterproof and breathable antibacterial film layer, a second non-woven fabric layer, a superabsorbent core layer, a first non-woven fabric layer, an antibacterial modified fiber non-woven fabric layer, and a silicone gel adhesive fixing layer, which are stacked sequentially. The superabsorbent core layer is wrapped by the first nonwoven fabric layer and the second nonwoven fabric layer, and the four edges of the first nonwoven fabric layer and the second nonwoven fabric layer are sealed together to form a cover structure that wraps the superabsorbent core layer. The first non-woven fabric layer is a hydrophilic non-woven fabric layer, and the second non-woven fabric layer is a hydrophilic non-woven fabric layer or a hydrophobic non-woven fabric layer. The antibacterial modified fiber nonwoven layer is made of gel antibacterial fiber, which is loaded with antibacterial active ingredients.

[0007] Furthermore, the gel antibacterial fiber is selected from at least one of sodium carboxymethyl cellulose fiber, sodium sulfonate cellulose fiber, and sodium ethyl sulfonate cellulose fiber.

[0008] Furthermore, the reinforcing fiber is selected from at least one of Tencel cellulose fiber, alginate fiber, and ES fiber. The reinforcing fiber is used to improve the tensile strength and permeation conduction and diffusion efficiency of the antibacterial modified fiber nonwoven fabric layer, and to maintain the integrity of the nonwoven fabric after liquid absorption.

[0009] Furthermore, the antibacterial active ingredient is selected from at least one of silver ions, copper ions, PHMB biguanide, and quaternary ammonium salt molecules.

[0010] Furthermore, the basis weight of the antibacterial modified fiber nonwoven fabric layer is 30 gsm to 200 gsm.

[0011] Furthermore, the mass ratio of the gel antibacterial fiber to the reinforcing fiber is 1:9 to 9:1.

[0012] Furthermore, the degree of substitution of the gel antibacterial fiber is 0.1 to 0.5.

[0013] Furthermore, the silicone gel adhesive layer is provided with a mesh or hollow structure; The mesh or perforated structure is one of the following: The silicone gel bonding and fixing layer has mesh holes of the same diameter distributed throughout its entire surface. The silicone gel adhesive layer has a first mesh corresponding to the core area of ​​the superabsorbent core layer, and the silicone gel adhesive layer has a second mesh corresponding to the adhesive edge area around the dressing. The aperture of the first mesh is larger than the aperture of the second mesh. The silicone gel adhesive layer has a hollowed-out opening in the core area corresponding to the superabsorbent core layer, and the silicone gel adhesive layer has ventilation holes or a continuous closed surface in the adhesive edge area around the dressing.

[0014] Furthermore, the aperture of the first mesh is 1 mm to 10 mm, and the aperture of the second mesh is 0.1 mm to 4 mm.

[0015] Furthermore, the superabsorbent core layer is a superabsorbent resin or a superabsorbent fiber; The edges of the first nonwoven fabric layer and the second nonwoven fabric layer are sealed together by adhesive bonding or thermal bonding.

[0016] Compared with existing technologies, the antibacterial superabsorbent wound dressing provided by this invention integrates multiple functions such as waterproofing, breathability, antibacterial properties, liquid absorption, antibacterial properties, anti-adhesion, and fixation. Its superabsorbent core layer is sealed and wrapped around the edges of the first and second non-woven fabric layers to form a cover structure. This not only eliminates the safety hazard of superabsorbent material scattering and leakage from the structure, but also effectively avoids skin maceration around the wound caused by backflow of exudate through the rapid diversion of the hydrophilic first non-woven fabric layer and the strong liquid-locking of the superabsorbent core layer. At the same time, the antibacterial modified fiber non-woven fabric layer, which is made of a mixture of gel antibacterial fibers and reinforcing fibers, forms a flexible gel layer after encountering exudate, effectively avoiding tearing damage to newly formed granulation tissue. The reinforcing fibers ensure the uniform diffusion of exudate and prevent local swelling and pressure on the wound surface. This achieves a comprehensive improvement in performance, including long-lasting antibacterial effect, rapid liquid diversion, safe liquid-locking, non-adhesion to the wound surface, and promotion of healing. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the antibacterial superabsorbent wound dressing silicone gel adhesive fixing layer with a full-surface distributed mesh, as provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of the antibacterial superabsorbent wound dressing provided in this embodiment of the invention, where the silicone gel adhesive layer corresponding to the superabsorbent core layer has a first mesh in the core area and the silicone gel adhesive layer corresponding to the adhesive edge area around the dressing has a second mesh. Figure 3 This is a schematic diagram of the structure of the antibacterial superabsorbent wound dressing provided in this embodiment of the invention, where the silicone gel adhesive layer of the dressing has a hollowed-out opening in the core area corresponding to the superabsorbent core layer, and the adhesive edge area around the dressing is a continuous closed surface. Figure 4 This is a schematic diagram of the structure of the antibacterial superabsorbent wound dressing provided in this embodiment of the invention, where the silicone gel adhesive layer has a hollowed-out opening in the dressing core area corresponding to the superabsorbent core layer, and the silicone gel adhesive layer has a venting hole in the adhesive edge area around the dressing.

[0019] Figure label: 100. Polyurethane waterproof, breathable, and antibacterial film layer; 200. Second non-woven fabric layer; 300. Super absorbent core layer; 400. First non-woven fabric layer; 500. Antibacterial modified fiber non-woven fabric layer; 600. Silicone gel adhesive fixing layer. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] like Figures 1 to 4 As shown, the present invention provides an antibacterial superabsorbent wound dressing with a multi-layer composite integrated structure. From the upper surface (i.e., the side away from the wound) to the lower surface (i.e., the side in contact with the wound), the dressing is sequentially stacked with a polyurethane waterproof, breathable, and antibacterial film layer 100, a second non-woven fabric layer 200, a superabsorbent core layer 300, a first non-woven fabric layer 400, an antibacterial modified fiber non-woven fabric layer 500, and a silicone gel adhesive fixing layer 600.

[0028] The top layer of polyurethane waterproof, breathable and antibacterial film 100 (PU film layer) has the triple functions of waterproof, breathable and antibacterial. It can effectively block bacteria and sewage from the external environment from entering the wound, while allowing water vapor generated by the wound to flow outward, avoiding the wound from being stuffy and humid, and creating a dry and clean external environment for wound healing.

[0029] The superabsorbent core layer 300 is completely enclosed by the first nonwoven fabric layer 400 and the second nonwoven fabric layer 200. The four edges of the first nonwoven fabric layer 400 and the second nonwoven fabric layer 200 are sealed together by adhesive bonding, thermal bonding, or ultrasonic heat sealing to form a cover structure enclosing the superabsorbent core layer 300. This cover structure can completely eliminate the risk of superabsorbent core layer material (whether granular or fibrous) scattering or leaking onto the wound surface, significantly improving the safety of the dressing. The first nonwoven fabric layer 400 is preferably a hydrophilic nonwoven fabric, and its material can be selected from polyester, polypropylene, polyamide, etc.; it is closely attached to the antibacterial modified fiber nonwoven fabric layer 500, which can quickly conduct and diffuse wound exudate, and evenly guide the exudate into the superabsorbent core layer 300 above; the second nonwoven fabric layer 200 can be a hydrophilic nonwoven fabric or a hydrophobic nonwoven fabric, and its material can be selected from polyester, polypropylene, polyamide, thermoplastic polyurethane, etc. The superabsorbent core layer 300 is preferably made of superabsorbent polymer (SAP), superabsorbent fiber (SAF), or a combination of SAP and SAF. Alternatively, the superabsorbent core layer 300 can be a mixed core layer obtained by hot pressing a mixture of SAP and / or SAF with at least one of wood pulp fiber, spunbond fiber, ES fiber, and cotton fiber. This core layer has a superior absorption and retention capacity for exudate, and due to the guiding effect of the first nonwoven fabric layer 400, the exudate is evenly absorbed into the superabsorbent core layer 300, avoiding localized pressure on the wound caused by concentrated exudate absorption and swelling in the core layer.

[0030] An antibacterial modified fiber nonwoven layer 500 is laminated to the lower surface of the first nonwoven layer 400. This layer is made of a mixture of gel antibacterial fibers and reinforcing fibers. The gel antibacterial fibers are preferably at least one of sodium carboxymethyl cellulose fibers, sodium sulfonate cellulose fibers, and sodium ethyl sulfonate cellulose fibers; the reinforcing fibers are preferably at least one of Tencel / lyocell cellulose fibers, alginate fibers, and ES fibers. The gel antibacterial fibers are loaded with antibacterial active ingredients, which are selected from at least one of silver ions, copper ions, PHMB biguanide, and quaternary ammonium salt molecules. The reinforcing fibers act as a skeleton in the nonwoven fabric, maintaining good mechanical strength after liquid absorption, ensuring that the fiber gel layer remains intact and does not break after liquid absorption.

[0031] Furthermore, to improve the overall performance of the dressing, the basis weight of the antibacterial modified fiber nonwoven layer 500 is preferably 30 gsm to 200 gsm (more preferably 50-150 gsm, most preferably 80-120 gsm); the mass ratio of gel antibacterial fiber to reinforcing fiber is 1:9 to 9:1 (preferably 3:7 to 7:3, more preferably 4:6 to 6:4). This ratio can balance the antibacterial properties, mechanical strength, and exudate conduction and diffusion efficiency of the dressing.

[0032] The silicone gel adhesive layer 600 is located at the bottom of the dressing and is used to gently fix the dressing to the skin around the wound. It features gentle adhesion, leaves no residue after removal, and does not damage the skin. To address the challenge of balancing breathability and adhesive stability in traditional dressings, this invention employs diverse structural designs for the silicone gel adhesive layer 600. Specifically, the silicone gel adhesive layer 600 has mesh or perforated structures, forming the following four specific implementation structures (corresponding to different application scenarios): Example 1 like Figure 1 As shown, in this embodiment, the silicone gel adhesive fixing layer 600 has a structure with meshes of the same aperture distributed across its entire surface.

[0033] Specifically, the material selection and parameters for each layer are as follows: the polyurethane waterproof, breathable, and antibacterial film layer 100 uses conventional PU film; the second nonwoven fabric layer 200 uses hydrophobic nonwoven fabric; the superabsorbent core layer 300 uses 250gsm SAF superabsorbent fiber, which is wrapped by the first nonwoven fabric layer 400 (hydrophilic nonwoven fabric) and the second nonwoven fabric layer 200, and the four edges are sealed by thermal bonding to form a completely leak-proof cover; the antibacterial modified fiber nonwoven fabric layer 500 has a basis weight of 80gsm, in which the gel antibacterial fiber is carboxymethyl cellulose sodium silver fiber (silver loading 2% w / w), the degree of substitution is 0.2, and the mass ratio of gel antibacterial fiber to reinforcing fiber (cellulose reinforcing fiber) is 4:6; the silicone gel bonding and fixing layer 600 adopts a full-surface mesh design with a mesh diameter of 2mm.

[0034] This embodiment adopts a full-surface mesh structure, which has a simple manufacturing process and low cost. It can simultaneously achieve all-round air permeability, fluid permeability and fixation functions, and is suitable for general wound scenarios such as routine superficial wounds, minor abrasions and postoperative superficial wounds.

[0035] Example 2 like Figure 2 As shown, in this embodiment, the silicone gel adhesive fixing layer 600 has a partitioned perforated structure, that is, the core area corresponding to the superabsorbent core layer 300 is provided with a first mesh, and the adhesive edge area corresponding to the dressing is provided with a second mesh, and the aperture of the first mesh is larger than the aperture of the second mesh.

[0036] Specifically, the material selection and parameters for each layer are as follows: the polyurethane waterproof, breathable, and antibacterial film layer 100 uses PU film; the second non-woven fabric layer 200 uses hydrophilic non-woven fabric; the super-absorbent core layer 300 uses 400gsm SAP super absorbent resin, which is wrapped by the first non-woven fabric layer 400 (hydrophilic non-woven fabric) and the second non-woven fabric layer 200, and the four edges are sealed by ultrasonic heat sealing; the antibacterial modified fiber non-woven fabric layer 500 has a basis weight of 100gsm, in which the gel antibacterial fiber is sodium ethyl sulfonate cellulose PHMB fiber (PHMB content 2% w / w), the degree of substitution is 0.3, and the mass ratio of gel antibacterial fiber to reinforcing fiber (alginate fiber and ES fiber mixture) is 5:5; in the silicone gel adhesive fixation layer 600, the first mesh opening diameter in the core area (corresponding to the wound exudate area) is 3mm, and the second mesh opening diameter in the adhesive edge area (corresponding to the surrounding healthy skin) is 1mm.

[0037] In this embodiment, the large-pore design of the dressing core area can quickly drain large amounts of exudate from the wound, preventing the exudate, especially viscous liquid, from accumulating on the wound surface; the small-pore design of the adhesive edge area ensures the breathability of the surrounding skin, preventing local skin from becoming stuffy and red due to long-term adhesion. This embodiment is suitable for wounds with large amounts of exudate, such as abrasions, cuts, and superficial second-degree burns, with fast fluid absorption and long-lasting antibacterial effect.

[0038] Example 3 like Figure 3 As shown, in this embodiment, the silicone gel adhesive layer 600 has a structure with a hollowed-out opening in the core-coating area and a continuous closed surface in the adhesive edge area. In this case, the antibacterial modified fiber nonwoven fabric layer 500 is directly exposed in the core-coating area.

[0039] Specifically, the material selection and parameters for each layer are as follows: the polyurethane waterproof, breathable, and antibacterial film layer 100 uses PU film; the second non-woven fabric layer 200 uses hydrophilic non-woven fabric; the super-absorbent core layer 300 uses 400gsm SAP super absorbent resin, and its perimeter is sealed by ultrasonic thermal bonding; the antibacterial modified fiber non-woven fabric layer 500 has a basis weight of 120gsm, in which the gel antibacterial fiber is quaternary ammonium gluconate chlorhexidine modified cellulose fiber (chlorhexidine gluconate loading 2% w / w), the degree of substitution is 0.4, and the mass ratio of gel antibacterial fiber to reinforcing fiber (cellulose reinforcing fiber) is 3:7; the core area of ​​the silicone gel adhesive fixing layer 600 is completely hollowed out, while the adhesive edge area is a continuous closed non-porous silicone surface.

[0040] In this embodiment, the dressing core area is completely unblocked by silicone, allowing exudate to directly enter the antibacterial modified fiber nonwoven fabric layer 500 with zero resistance. This antibacterial layer directly and fully contacts the wound surface, resulting in superior antibacterial effect. The non-porous, continuous, closed-off design of the adhesive edge area provides the strongest adhesion, preventing dressing displacement and detachment. This embodiment is suitable for wounds with high exudate volume and severe infection, focusing on efficient absorption, effective antibacterial action, and secure fixation.

[0041] Example 4 like Figure 4 As shown, in this embodiment, the silicone gel adhesive fixing layer 600 has a structure with a hollow opening in the core area and a breathable hole in the adhesive edge area.

[0042] Specifically, the material selection and parameters for each layer are as follows: the polyurethane waterproof, breathable, and antibacterial film layer 100 uses PU film; the second non-woven fabric layer 200 uses hydrophilic non-woven fabric; the super-absorbent core layer 300 uses 250g SAF super absorbent fiber, which is sealed around its perimeter by adhesive-thermal bonding; the antibacterial modified fiber non-woven fabric layer 500 has a basis weight of 150gsm, in which the gel antibacterial fiber is carboxymethyl cellulose sodium silver fiber (silver loading 2% w / w), with a degree of substitution of 0.35, and the mass ratio of gel antibacterial fiber to reinforcing fiber (Tencel cellulose and ES reinforcing fiber) is 6:4; the core area of ​​the silicone gel adhesive fixation layer 600 is completely hollowed out, the antibacterial modified fiber non-woven fabric layer 500 directly contacts the wound, and the adhesive edge area is uniformly opened with breathable pores with a diameter of 0.5mm.

[0043] This embodiment combines the advantages of silicone-free wound contact with Embodiment 3 with excellent breathability. The extremely small pores in the adhesive area further alleviate the pressure of the silicone gel adhesive layer on the skin, preventing skin irritation or allergies, while ensuring the stability of the dressing fixation. This embodiment is particularly suitable for wounds of patients with sensitive skin, pressure sores caused by prolonged bed rest, and chronic ulcers, meeting the needs of long-term, long-lasting care. It is safe, non-irritating, has long-lasting antibacterial properties, and excellent breathability.

[0044] Example 5 like Figure 4 As shown, in this embodiment, the silicone gel adhesive fixing layer 600 has a structure with a hollow opening in the core area and a breathable hole in the adhesive edge area.

[0045] Specifically, the material selection and parameters for each layer are as follows: the polyurethane waterproof, breathable, and antibacterial film layer 100 uses PU film; the second non-woven fabric layer 200 uses hydrophilic non-woven fabric; the super-absorbent core layer 300 uses 400g SAP super absorbent fiber, which is sealed around its perimeter by adhesive-thermal bonding; the antibacterial modified fiber non-woven fabric layer 500 has a basis weight of 150gsm, in which the gel antibacterial fiber is carboxymethyl cellulose sodium silver fiber (silver loading 2% w / w), with a degree of substitution of 0.35, and the mass ratio of gel antibacterial fiber to reinforcing fiber (Tencel cellulose and ES reinforcing fiber) is 6:4; the core area of ​​the silicone gel adhesive fixation layer 600 is completely hollowed out, the antibacterial modified fiber non-woven fabric layer 500 directly contacts the wound, and the adhesive edge area has evenly opened breathable pores with a diameter of 1mm.

[0046] Due to the higher liquid absorption capacity of the SAP material, this embodiment exhibits a higher liquid retention capacity compared to Embodiments 3 and 4, combining the high absorption speed and diffusion of Embodiment 3 with the good adhesion and breathability of the adhesive edge in Embodiment 4. It can meet the needs of long-term, long-lasting care, is safe and non-irritating, has long-lasting antibacterial properties, and excellent breathability.

[0047] Experimental Example 1: Screening and Optimization of Parameters for Antibacterial Modified Fiber Nonwoven Fabric Layers This invention conducted comparative tests on antibacterial fiber nonwoven fabrics using 100gsm to verify the effects of substitution degree and fiber ratio on dressing performance. The test results are shown in Table 1.

[0048] Table 1. Comparison of performance of antibacterial fiber nonwoven fabrics with different degrees of substitution and ratios.

[0049] Table 1 shows that, by comparing groups 1, 2, 4, 5, and 6, when the ratio of antibacterial gel fiber to reinforcing fiber is the same, the higher the degree of substitution of the antibacterial gel fiber, the better the gelation effect, but the slower the liquid absorption speed and the smaller the diffusion area (when the degree of substitution reaches 0.8, the liquid absorption speed is as high as 15s, and the diffusion area is only 2.1cm). By comparing groups 3 and 4, it is shown that when the degree of substitution of the antibacterial gel fiber is the same, the addition of reinforcing fiber significantly improves the wet tensile strength, liquid absorption speed, and diffusion area of ​​the nonwoven fabric. Therefore, the present invention preferably limits the degree of substitution of the gel antibacterial fiber to between 0.1 and 0.5 (more preferably 0.2 to 0.4). When the degree of substitution is below 0.1, the gelation effect is poor, easily adhering to the wound, and the liquid-locking effect is poor, easily causing backflow and soaking of the wound; when the degree of substitution is above 0.5, the fiber nonwoven fabric is prone to gel blocking effect after absorbing liquid, resulting in poor liquid conduction and diffusion ability, and at the same time, the wet tensile strength is also poor, and it cannot maintain its integrity after absorbing liquid.

[0050] Test Example 2: Comparison Test of Finished Product Performance The dressings prepared in Examples 1 to 4 were compared with commercially available products (Mepilex border Ag, AllyvenAg gentle border) in performance testing. Absorption capacity, retention capacity, and MVTR were tested according to EN3726-2023 standards; antibacterial rate was tested according to ATCC100-2019 standards. Test data are shown in Table 2. Table 2. Performance Comparison of Examples and Commercially Available Products

[0051] (Note: SA represents Staphylococcus aureus, EC represents Escherichia coli, and MVTR represents water vapor transmission rate.) As shown in Table 2, the embodiments of the present invention are significantly superior to commercially available products in terms of liquid absorption (0.95-2.13 g / cm²), liquid retention (0.78-1.73 g / cm²), liquid absorption speed (5-8 s), and diffusion diameter (5.6-7.1 cm). Embodiment 3 (core-hole design + non-porous adhesive edge design) has the highest liquid absorption (2.13 g / cm²) and liquid retention (1.73 g / cm²), while also possessing the fastest liquid absorption speed (5 s). However, due to the non-porous adhesive edge design, the MVTR (0.06 g / cm².24 h) is relatively low. Embodiment 4 maintains both adhesion and a certain degree of air permeability, but its liquid absorption and retention are slightly inferior to Embodiment 3. Compared with Embodiments 3 and 4, Embodiment 5 combines the advantages of both, achieving an excellent balance between high liquid absorption, high liquid retention, fast flow, and air permeability. Furthermore, all embodiments demonstrated antibacterial efficacy superior to or equivalent to commercially available products (>99.99%).

[0052] In the above embodiments, the thickness of the superabsorbent core layer 300 and the coordination between the functional layers can be adjusted according to the actual wound exudate volume and wound condition, all of which fall within the protection scope of this invention. When preparing the above dressing, the materials can be assembled using conventional processes such as lamination, coating, die-cutting, perforation, and hot-press sealing to obtain the final product. In practical use, the dressing of this invention is applied by removing the anti-adhesive film and attaching the silicone gel adhesive layer 600 to the healthy skin surrounding the wound. The antibacterial modified fiber nonwoven fabric layer 500 can then directly contact the wound area, rapidly exerting its drainage, antibacterial, and anti-adhesion effects upon contact with exudate.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An antibacterial superabsorbent wound dressing, characterized in that, It includes a polyurethane waterproof, breathable, and antibacterial film layer, a second non-woven fabric layer, a super-absorbent core layer, a first non-woven fabric layer, an antibacterial modified fiber non-woven fabric layer, and a silicone gel adhesive fixing layer, which are stacked in sequence. The superabsorbent core layer is wrapped by the first nonwoven fabric layer and the second nonwoven fabric layer, and the four edges of the first nonwoven fabric layer and the second nonwoven fabric layer are sealed together to form a cover structure that wraps the superabsorbent core layer. The first nonwoven fabric layer is a hydrophilic nonwoven fabric layer, and the second nonwoven fabric layer is either a hydrophilic nonwoven fabric layer or a hydrophobic nonwoven fabric layer. The antibacterial modified fiber nonwoven layer is made of gel antibacterial fiber, which is loaded with antibacterial active ingredients.

2. The antibacterial superabsorbent wound dressing according to claim 1, characterized in that, The gel antibacterial fiber is selected from at least one of sodium carboxymethyl cellulose fiber, sodium sulfonate cellulose fiber, and sodium ethyl sulfonate cellulose fiber.

3. The antibacterial superabsorbent wound dressing according to claim 1, characterized in that, The antibacterial modified fiber nonwoven fabric layer also includes reinforcing fibers, which are selected from at least one of Tencel cellulose fiber, alginate fiber, and ES fiber. The reinforcing fibers are used to improve the tensile strength and permeation conduction and diffusion efficiency of the antibacterial modified fiber nonwoven fabric layer, and to maintain the integrity of the nonwoven fabric after liquid absorption.

4. The antibacterial superabsorbent wound dressing according to claim 1, characterized in that, The antibacterial active ingredient is selected from at least one of silver ions, copper ions, PHMB biguanide, and quaternary ammonium salt molecules.

5. The antibacterial superabsorbent wound dressing according to claim 1, characterized in that, The basis weight of the antibacterial modified fiber nonwoven fabric layer is 30 gsm to 200 gsm.

6. The antibacterial superabsorbent wound dressing according to claim 3, characterized in that, The mass ratio of the gel antibacterial fiber to the reinforcing fiber is 1:9 to 9:

1.

7. The antibacterial superabsorbent wound dressing according to claim 1, characterized in that, The degree of substitution of the gel antibacterial fiber is 0.1 to 0.

5.

8. The antibacterial superabsorbent wound dressing according to claim 1, characterized in that, The silicone gel adhesive layer is provided with a mesh or hollow structure; The mesh or perforated structure is one of the following: The silicone gel bonding and fixing layer has mesh holes of the same diameter distributed throughout its entire surface. The silicone gel adhesive layer has a first mesh corresponding to the core area of ​​the superabsorbent core layer, and the silicone gel adhesive layer has a second mesh corresponding to the adhesive edge area around the dressing. The aperture of the first mesh is larger than the aperture of the second mesh. The silicone gel adhesive layer has a hollowed-out opening in the core area corresponding to the superabsorbent core layer, and the silicone gel adhesive layer has ventilation holes or a continuous closed surface in the adhesive edge area around the dressing.

9. The antibacterial superabsorbent wound dressing according to claim 8, characterized in that, The aperture of the first mesh is 1 mm to 10 mm, and the aperture of the second mesh is 0.1 mm to 4 mm.

10. The antibacterial superabsorbent wound dressing according to claim 1, characterized in that, The superabsorbent core layer is a superabsorbent resin or a superabsorbent fiber; The edges of the first nonwoven fabric layer and the second nonwoven fabric layer are sealed together by adhesive bonding or thermal bonding.

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