Wound dressing

Abstract

The utility model relates to the technical field of dressings, in particular to a wound dressing. The wound dressing comprises a surface layer, a core body layer, a skin contact layer and a protective layer which are sequentially attached together from top to bottom, and an activated carbon non-woven fabric is arranged in the core body layer. According to the wound dressing, the activated carbon non-woven fabric is additionally arranged in the core body layer, so that the defects of a traditional wound dressing in the aspect of treating a peculiar smell wound are overcome, the comfort and safety of a product are ensured, and the application range of a silica gel foam dressing is further widened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dressings, in particular to a wound dressing. BACKGROUND

[0002] With the development of medical technology, wound care materials are also constantly improving, aiming to better promote wound healing, reduce the risk of infection and improve patient comfort. Traditional wound dressings are mainly gauze and cotton, but such materials have poor air permeability, are prone to bacterial growth, and need to be replaced frequently. In recent years, silicone foam dressings have been widely welcomed due to their good air permeability, water resistance and liquid absorption capacity, becoming one of the mainstream products in the field of wound care.

[0003] However, the existing silicone foam dressing still has some shortcomings, especially in dealing with wounds with odors. For example, according to patent CN201620092271, the current silicone foam dressing structure mainly includes a layer of polyurethane film, a liquid absorption layer (composed of a water absorption fiber layer, a flow guide non-woven fabric and a polyurethane foam), a silicone gel net and a protective film. Although this structure can effectively absorb wound exudate, the material itself lacks the ability to adsorb odors, and cannot meet the needs of some special wound care, such as diabetic foot ulcers, large area burns, etc. with strong odor. This not only affects the patient's social activities, but also may lead to increased psychological burden, affecting the rehabilitation process.

[0004] In order to solve the above problems, some solutions on the market add activated carbon powder or particles to the dressing to enhance its ability to adsorb odors. However, this approach has the following drawbacks:

[0005] Uneven distribution of activated carbon: The distribution of powdered or granular activated carbon in the dressing is difficult to control uniformly, and local adsorption capacity may be too strong or too weak, affecting overall performance.

[0006] Poor material stability: Powdered or granular activated carbon can easily fall off during use, which may cause secondary pollution or irritation to the wound.

[0007] In view of the above problems, it is particularly important to develop a dressing that can efficiently adsorb odors without affecting other excellent properties. CONTENT OF THE INVENTION

[0008] In order to overcome the shortcomings of the prior art, the present application provides a wound dressing, which adds activated carbon non-woven fabric to the core layer, not only solving the shortcomings of traditional wound dressings in dealing with odor wounds, but also ensuring the comfort and safety of the product, further widening the application range of silicone foam dressings.

[0009] The beneficial effects of the present application are:

[0010] A wound dressing comprising a surface layer, a core layer, a skin contact layer and a protective layer which are sequentially attached together from top to bottom;

[0011] The core layer is provided with an activated carbon non-woven fabric.

[0012] In one or more of the technical solutions, the core layer comprises a hot air non-woven fabric, an activated carbon non-woven fabric and a polyurethane foam layer which are sequentially provided and pressed together from top to bottom.

[0013] In one or more of the technical solutions, the adsorption of the activated carbon non-woven fabric is not less than 90%.

[0014] In one or more of the technical solutions, the core layer is compounded and edge-pressed by a high-frequency process, the width of the edge-pressing is 2-3mm, and the thickness of the edge-pressing is less than or equal to 2mm.

[0015] In one or more of the technical solutions, the overall shape of the core layer is square, and the edges of the core layer are flat.

[0016] In one or more of the technical solutions, the material of the hot air non-woven fabric is polyester fiber or polypropylene fiber.

[0017] In one or more of the technical solutions, the skin contact layer is a silicone gel net.

[0018] In one or more of the technical solutions, the surface layer is a polyurethane film.

[0019] In one or more of the technical solutions, the protective layer comprises a whole piece and an edge piece, and the whole piece covers 1.5mm at the edge piece.

[0020] In one or more of the technical solutions, the protective layer comprises a left edge piece, a right edge piece and a middle whole piece, and the middle whole piece covers the left edge piece and the right edge piece on both sides.

[0021] The beneficial effects of the present application are:

[0022] The wound dressing described in the present application has an activated carbon non-woven fabric as the middle layer of the core layer, which has an adsorption of more than 90%; the core layer utilizes the strong adsorption of activated carbon to effectively absorb and isolate the odor, smell and other gases generated by the wound, thereby greatly improving the use experience of the patient and reducing the work burden of the nursing staff.

[0023] Moreover, the core layer is composed of three layers of material and is edge-pressed by a high-frequency process, the overall shape is square, the edges are flat, the edge-pressing width is 2-3mm, and the thickness is not more than 2mm. This design of the core layer not only ensures the stability and durability of the product, but also improves the comfort and fit during use.

[0024] In addition, the polyurethane foam as the bottom layer material of the core layer can quickly absorb the liquid exuded from the wound, keeping the wound dry. The synergistic effect of the polyurethane foam and the activated carbon non-woven fabric enables the product to simultaneously realize the functions of odor adsorption and wound exudate absorption during use. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described below in conjunction with the drawings and examples.

[0026] Figure 1 is a structural schematic diagram of a wound dressing described in the present application;

[0027] Figure 2 is another structural schematic diagram of a wound dressing described in the present application;

[0028] Figure 3 is a structural schematic diagram of a protective layer described in the present application;

[0029] Figure 4 is another structural schematic diagram of a protective layer described in the present application;

[0030] Wherein: 1, surface layer; 2, core layer; 3, skin contact layer; 4, protective layer; 21, hot air non-woven fabric; 22, activated carbon non-woven fabric; 23, polyurethane foam layer; 41, whole piece; 42, folded edge piece; 43, left folded edge piece; 44, right folded edge piece; 45, middle whole piece. DETAILED DESCRIPTION

[0031] The concept, specific structure and technical effects of the present application will be described below in conjunction with the examples and drawings to fully understand the purpose, features and effects of the present application. Obviously, the described examples are only part of the examples of the present application, not all examples. Based on the examples of the present application, other examples obtained by those skilled in the art without creative labor are within the scope of protection of the present application. In addition, all the coupling / connection relationships involved in the patent do not mean that the components are directly connected, but that a better coupling structure can be composed by adding or reducing coupling accessories according to the specific implementation. The technical features in the creation of the present application can be combined interactively without mutual contradiction and conflict.

[0032] Terminology:

[0033] High frequency process, a technology that uses high frequency electromagnetic field to generate heat, which makes the material rapidly heated and combined under high frequency vibration, commonly used for pressing and welding of composite materials. In the present application, the high frequency process is used to press the materials of each layer of the core layer into a whole, ensuring the stability and durability of the materials.

[0034] Hot air nonwoven fabric is a kind of non-woven fabric made by hot air method (hot rolling). It is made of fiber web through high temperature hot rolling treatment, so that the bonding points between fibers are melted to form a stable three-dimensional network structure. Hot air nonwoven fabric has good flexibility and certain thickness, which can provide supporting force and pressure dispersion effect.

[0035] Activated carbon nonwoven fabric is a kind of functional nonwoven fabric, which is made by uniformly distributing activated carbon powder or particles in nonwoven fabric substrate. Activated carbon nonwoven fabric has porous structure, which can effectively adsorb and isolate gas and odor molecules. In this application, activated carbon nonwoven fabric is used to adsorb and isolate odor and odor produced by wound.

[0036] Polyurethane foam is a kind of material with porous structure, which has good water absorption and air permeability. In this application, polyurethane foam layer is used to absorb liquid exuded from wound, keep wound dry and promote healing.

[0037] Silicone gel net is a kind of net-like material made of silicone gel, which has good viscosity and air permeability. In this application, silicone gel net is used as skin contact layer, which provides gentle viscosity to ensure that the dressing is closely attached to the skin, while avoiding secondary damage.

[0038] Although traditional silicone foam dressing has good air permeability and water absorption, it cannot effectively absorb and isolate odor and odor produced by wound, which affects the use experience of patients to some extent. Therefore, this application provides a kind of wound dressing as shown in Figure 1 The wound dressing comprises face layer 1, core layer 2, skin contact layer 3 and protective layer 4 which are attached together from top to bottom.

[0039] The core layer 2 is provided with activated carbon nonwoven fabric 22.

[0040] Specifically, the activated carbon nonwoven fabric is a kind of functional nonwoven fabric, which is made by uniformly distributing activated carbon powder or particles in nonwoven fabric substrate. Activated carbon nonwoven fabric has porous structure, which can effectively adsorb and isolate gas and odor molecules.

[0041] The thickness of activated carbon nonwoven fabric is usually 1-2mm, which ensures sufficient adsorption capacity and good flexibility.

[0042] Specifically, in the wound dressing, the face layer is located at the outermost side, which directly contacts with the external environment.

[0043] The core layer is located below the face layer, and the skin contact layer is located below the core layer, which directly contacts with the skin.

[0044] The protective layer is located at the bottom, which covers the skin contact layer and needs to be removed before use.

[0045] Therefore, by the above technical solution, the activated carbon non-woven fabric has an adsorption rate of more than 90%, and can effectively provide the ability to adsorb odor.

[0046] In one or more embodiments, as shown in Figure 2 The core layer 2 includes, from top to bottom, a thermal air non-woven fabric 21, an activated carbon non-woven fabric 22, and a polyurethane foam layer 23 that are pressed together.

[0047] Specifically, the thermal air non-woven fabric is a kind of non-woven fabric made by thermal air method (hot rolling). The thermal air non-woven fabric is made by high-temperature hot rolling treatment of fiber web, so that the bonding points between fibers are melted to form a stable three-dimensional network structure.

[0048] It can be understood that the thermal air non-woven fabric adopts a network structure, has good flexibility and certain thickness, and can provide support and pressure dispersion effect.

[0049] The thermal air non-woven fabric has a thickness range of 3-5mm, so that the product has a certain thickness (thickest part greater than 5mm), ensuring that the product has a certain support and pressure dispersion effect.

[0050] It can be understood that the thermal air non-woven fabric is made of polyester fiber (Polyester) or polypropylene fiber (Polypropylene). These two kinds of fibers have good mechanical properties and chemical stability, and are suitable for medical dressings.

[0051] Specifically, the polyurethane foam layer has a thickness of 3mm or 5mm, providing different amounts of absorbency for different exudate wounds; for example, the polyurethane foam layer has a thickness of 3mm: the thinner polyurethane foam has a smaller absorption capacity, and is suitable for light exudate wounds. The foam of this thickness can quickly absorb a small amount of exudate, keep the surrounding of the wound dry, and reduce bacterial growth.

[0052] For example, the polyurethane foam layer has a thickness of 5mm: the thicker polyurethane foam has a larger absorption capacity, and is suitable for heavy exudate wounds. The foam of this thickness can absorb more exudate, maintain a moist environment around the wound, and promote healing.

[0053] In one or more embodiments, the core layer 2 is compounded and edge-pressed by a high-frequency process, the width of the edge-pressing is 2-3mm, and the thickness of the edge-pressing is less than or equal to 2mm; the overall shape of the core layer 2 is square, and the edges of the core layer 2 are flat.

[0054] Specifically, the high-frequency process for composite edge-pressing can be performed by a conventional high-frequency process, or by the following specific steps:

[0055] S1. Material preparation:

[0056] Thermal air non-woven fabric: thickness of 3-5mm, material of polyester fiber or polypropylene fiber.

[0057] Activated carbon non-woven fabric: thickness of 1-2mm, with adsorption of more than 90%.

[0058] Polyurethane foam: thickness of 3mm or 5mm, providing different absorption capacity.

[0059] S2. Material stacking:

[0060] Stack the thermal air non-woven fabric, activated carbon non-woven fabric, and polyurethane foam in order, ensuring that each layer of material is aligned.

[0061] S3. Place the mold:

[0062] Place the stacked materials into the mold of the high-frequency machine, which is square in shape with a pressure edge area designed on the edge.

[0063] S4. High-frequency processing:

[0064] The high-frequency machine generates heat through a high-frequency electromagnetic field, causing the materials to rapidly heat up under high-frequency vibration. Set an appropriate temperature, usually between 180-220°C, and adjust the specific temperature according to actual conditions. Apply appropriate pressure to make the materials bond together under high temperature.

[0065] S5. Cooling and shaping:

[0066] Therefore, through the high-frequency process of composite pressure edge, each layer of material is bonded together under high temperature and high pressure, forming a whole, enhancing the structural stability of the core layer, avoiding separation of each layer of material during use, and ensuring the long-term use effect of the product. Moreover, the edge is flattened, with a pressure edge width of 2-3mm and a pressure edge thickness less than or equal to 2mm, ensuring good edge sealing. In addition, the edge sealing of the core layer is good, which can effectively prevent wound exudate from leaking from the edge and maintain the absorption effect of the dressing.

[0067] In one or more embodiments, the skin contact layer 3 is a perforated silicone gel mesh.

[0068] Specifically, the perforated silicone gel mesh is mild and non-irritating, avoiding secondary damage; the hole shape of the silicone gel mesh can be round or oval, with a pore size of 1.5-2.0mm.

[0069] In one or more embodiments, the face layer 1 is a polyurethane film.

[0070] Specifically, the face layer is a polyurethane film, which has high air permeability and waterproof and antibacterial effects, and can isolate the influence of the external environment; the thickness of the polyurethane film is 15-20μm.

[0071] In one or more embodiments, as shown in FIG. 4, the protective layer 4 comprises a whole piece 41 and a folded edge piece 42, the whole piece 41 covers 1.5 mm at the folded edge piece 42, where the shaded part is the covered part. The folded edge design makes the protective layer easier to be torn off, and the user can easily remove the protective layer. Figure 3

[0072] Alternatively, as shown in FIG. 5, the protective layer 4 comprises a left folded edge piece 43, a right folded edge piece 44 and a middle whole piece 45, the middle whole piece 45 covers the left folded edge piece 43 and the right folded edge piece 44 on both sides, where the shaded part is the covered part. The three-piece design of the left folded edge piece 43, the right folded edge piece 44 and the middle whole piece 45 provides more comprehensive protection, ensuring that the silicone gel mesh is not contaminated and damaged before use. Figure 3

[0073] Therefore, through the folded edge design of the protective layer, the silicone gel mesh can be effectively protected from contamination and damage before use, ensuring its hygiene and integrity when in use. The folded edge design also makes the protective layer easier to be torn off, making it convenient for users to use, while improving the aesthetics of the product.

[0074] In addition, the material of the protective layer is PP or PE.

[0075] Therefore, in summary of the above, the wound dressing described in the present application has the following production and assembly process:

[0076] The three-layer material of hot air non-woven fabric, activated carbon non-woven fabric and polyurethane foam is compounded and pressed by high-frequency technology to form a core layer.

[0077] A polyurethane film is attached on top of the core layer to form a surface layer.

[0078] A silicone gel mesh is attached below the core layer to form a skin contact layer.

[0079] A protective layer is attached below the silicone gel mesh to complete the assembly and production of the entire dressing.

[0080] During use, the activated carbon non-woven fabric in the core layer effectively adsorbs and isolates the odor, smell and other gases generated by the wound by utilizing the adsorption properties of activated carbon.

[0081] The surface layer uses a polyurethane film to provide waterproof, breathable and antibacterial effects, protecting the wound from external environmental interference.

[0082] The skin contact layer uses a silicone gel mesh to provide a mild adhesion, ensuring that the dressing is tightly attached to the skin, while avoiding secondary damage.

[0083] ​​The above describes the preferred embodiments of the present application, but the present application is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A wound dressing, characterized in that, It includes a surface layer (1), a core layer (2), a skin contact layer (3), and a protective layer (4) that are bonded together from top to bottom. The core layer (2) is provided with activated carbon nonwoven fabric (22); The core layer (2) includes hot air nonwoven fabric (21), activated carbon nonwoven fabric (22) and polyurethane foam layer (23) that are pressed together from top to bottom. The core layer (2) is composite pressed by high-frequency process, the width of the pressed edge is 2-3mm, and the thickness of the pressed edge is less than or equal to 2mm.

2. The wound dressing according to claim 1, characterized in that, The adsorption capacity of the activated carbon nonwoven fabric (22) is not less than 90%.

3. The wound dressing according to claim 1, characterized in that, The core layer (2) has a square shape and the edges of the core layer (2) are flat.

4. The wound dressing according to claim 1, characterized in that, The hot air nonwoven fabric (21) is made of polyester fiber or polypropylene fiber.

5. The wound dressing according to claim 1, characterized in that, The skin contact layer (3) is a silicone gel mesh.

6. The wound dressing according to claim 1, characterized in that, The surface layer (1) is a polyurethane film.

7. The wound dressing according to claim 1, characterized in that, The protective layer (4) includes a whole piece (41) and a folded edge piece (42), wherein the whole piece (41) covers the folded edge piece (42) by 1.5 mm.

8. The wound dressing according to claim 1, characterized in that, The protective layer (4) includes a left folded edge piece (43), a right folded edge piece (44) and a middle whole piece (45), the middle whole piece (45) covering the left folded edge piece (43) and the right folded edge piece (44) on both sides.

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