Foaming type polyurethane pressure-sensitive adhesive wound dressing
By using foamed polyurethane pressure-sensitive adhesive and physical foaming technology, the problem of high biotoxicity and high cost of pressure-sensitive adhesive materials in existing wound dressings is solved, and higher biocompatibility and lower cost are achieved, while providing liquid absorption function and anti-curling effect.
Patent Information
- Application Number
- CN202421703375.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-18
AI Technical Summary
The pressure-sensitive adhesive materials in existing wound dressings are prone to residual monomers, solvents, and initiators, which are highly biotoxic, have great irritation to the skin, and are costly, which limits their widespread use in clinical practice.
Foamed polyurethane pressure-sensitive adhesive is used to reduce the use of additives through physical foaming processes, simplify product structure, improve biocompatibility, and design anti-curve mechanisms to prevent the release layer from curling.
Reduces the irritation of polyurethane foam to the skin, improves the biocompatibility of the dressing, simplifies the product structure, reduces costs, and provides liquid absorption and anti-curling effect.
Smart Images
Figure CN222899479U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of wound dressings, and more specifically, to a foamed polyurethane pressure-sensitive adhesive wound dressing patch. Background Art
[0002] A wound dressing is a medical material used to cover wounds, sores, etc. A polyurethane foam dressing can not only provide a constant-temperature and moist environment for the wound, but also has advantages such as low toxicity, good biocompatibility, good air permeability, lightness and comfort, and is suitable for wounds with moderate to large amounts of exudate, and has currently received extensive attention in the market.
[0003] At present, during the preparation and use of the foam dressings, a pressure-sensitive adhesive is required for bonding between dressings and skin adhesion. Currently, the more commonly used adhesive materials are hot-melt pressure-sensitive adhesives, acrylate pressure-sensitive adhesives, silicone rubber pressure-sensitive adhesives, etc. Compared with polyurethane pressure-sensitive adhesives, acrylate pressure-sensitive adhesives and hot-melt pressure-sensitive adhesives are liable to leave residues of monomers, solvents, and initiators during the preparation process, and their biological toxicity is higher than that of polyurethane pressure-sensitive adhesives, and they are more irritating to skin wounds, and their peel strength is relatively large, causing greater irritation and harm to the sticking part; while silicone rubber-based pressure-sensitive adhesives have the characteristics of gentle peel strength and can be stuck repeatedly, but their cost is very high, which to a certain extent limits their extensive use in clinics and increases the economic burden on patients.
[0004] In order to solve the above problems, the present application provides a foamed polyurethane pressure-sensitive adhesive wound dressing patch. Utility Model Content
[0005] The foamed polyurethane pressure-sensitive adhesive wound dressing patch provided by the present application adopts the following technical solutions:
[0006] The foamed polyurethane pressure-sensitive adhesive wound dressing patch includes a backing layer and a foamed polyurethane pressure-sensitive adhesive. The top surface of the backing layer is provided with the foamed polyurethane pressure-sensitive adhesive. The top surface of the foamed polyurethane pressure-sensitive adhesive is provided with a release layer. The top surface of the backing layer is provided with a protective layer, and a sink is formed on the top surface of the protective layer. The foamed polyurethane pressure-sensitive adhesive is arranged inside the sink. The top surface of the protective layer is provided with an adhesive surface, and the release layer is adhered to the adhesive surface. The top surface of the release layer is provided with an anti-lifting mechanism.
[0007] By the above technical solutions, the foamed polyurethane pressure-sensitive adhesive is used to replace hot-melt pressure-sensitive adhesives, acrylate pressure-sensitive adhesives, silicone rubber pressure-sensitive adhesives, etc., which simplifies the product structure, reduces the irritation of various materials to the skin, improves the biocompatibility of the dressing, and the anti-lifting mechanism can prevent the four corners of the release layer from lifting.
[0008] Further, the anti-warping mechanism includes a hollow cylinder, a fixing strip, a folding strip and a sticker. A number of hollow cylinders are provided on the top surface of the release layer, and the inside of the hollow cylinder is hollow. Two fixing strips are arranged inside the hollow cylinder. A bent folding strip is arranged on the top surfaces of the two fixing strips. Another adhesive surface is arranged on the bottom surface of the folding strip, and a sticker is arranged on the surface of the adhesive surface.
[0009] Through the above technical solution, the folding strip is pulled out, the sticker is torn off, and the folding strip is adhered to the skin, which can play a role in limiting the device, thus realizing anti-warping.
[0010] Further, through grooves are formed on the top surfaces of both sides of the hollow cylinder, and movable blocks are arranged in the through grooves in a matching manner. A handle is fixedly connected to the top surface of the movable block.
[0011] Through the above technical solution, the handle facilitates the pulling out of the movable block, and the movable block can protect the inside of the hollow cylinder to prevent the internal items from falling off.
[0012] Further, a first magic tape is fixedly connected to the bottom surface of the fixing strip. A reserved groove is formed on the inner bottom surface of the hollow cylinder, and a second magic tape is arranged in the reserved groove in a matching manner with the first magic tape.
[0013] Through the above technical solution, the first magic tape and the second magic tape can limit the fixing strip.
[0014] Further, a pull rope is arranged on the top surface of the sticker, and one end of the pull rope abuts against the side surface of the movable block.
[0015] Through the above technical solution, the pull rope facilitates the extraction of the sticker and the folding strip from the hollow cylinder.
[0016] Further, four groups of hollow cylinders are provided, and the hollow cylinders are distributed at the four corners of the top surface of the release layer.
[0017] Through the above technical solution, the hollow cylinders are evenly distributed, which is convenient for limiting and anti-warping at the four corners of the device.
[0018] Further, the hollow cylinder is of a silica gel block structure, and the movable block is of a rubber block mechanism.
[0019] Through the above technical solution, both the hollow cylinder and the movable block have the characteristics of elasticity and stretchability, and the pressure on the patient's skin is relatively small.
[0020] In summary, the present application includes the following beneficial technical effects:
[0021] (1) The physical foaming process reduces the use of additives in the foaming process of polyurethane foam, reduces the irritation of polyurethane foam to the skin, and improves the biocompatibility of the dressing;
[0022] The foaming polyurethane pressure-sensitive adhesive is used to replace hot-melt pressure-sensitive adhesives, acrylate pressure-sensitive adhesives, silicone rubber pressure-sensitive adhesives, etc., which simplifies the product structure, reduces the irritation of multiple materials to the skin, and improves the biocompatibility of the dressing;
[0023] The polyurethane pressure-sensitive adhesive layer is foamed so that while having adhesive properties, it also has a certain liquid absorption function, can absorb wound exudate, prevent wound maceration, and at the same time maintain a certain humidity to provide a microenvironment conducive to wound healing;
[0024] Micro-foaming makes the dressing surface more delicate, can prevent newly grown granulation tissue from growing into the pores during wound healing, and can also avoid adhesion to the wound;
[0025] (5) The foaming polyurethane pressure-sensitive adhesive replaces the wound dressing layer and the adhesive layer, simplifies the dressing structure, and reduces the product cost. Description of the Drawings
[0026] Figure 1 is a schematic structural diagram of the present application;
[0027] Figure 2 is a partial cross-sectional view of the present application;
[0028] Figure 3 is a schematic structural diagram of the release layer of the present application;
[0029] Figure 4 is of the present application Figure 3 enlarged view at A in;
[0030] Figure 5 is a cross-sectional view of the hollow cylinder of the present application.
[0031] Explanation of the reference numerals in the drawings:
[0032] 1. Backing layer; 2. Protective layer; 3. Release layer; 4. Foaming polyurethane pressure-sensitive adhesive; 5. Adhesive surface; 6. Sunk groove; 7. Hollow cylinder; 8. Movable block; 9. Handle; 10. Fixed strip; 11. Folding strip; 12. Sticker; 13. Pulling rope; 14. Magic tape one; 15. Magic tape two. Detailed Embodiment
[0033] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
[0034] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0035] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, terms such as "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0036] Embodiment: The present application discloses a foamed polyurethane pressure-sensitive adhesive wound dressing. Please refer to Figure 1 and Figure 2 , which includes a backing layer 1 and a foamed polyurethane pressure-sensitive adhesive 4. The top surface of the backing layer 1 is provided with a foamed polyurethane pressure-sensitive adhesive 4. The top surface of the foamed polyurethane pressure-sensitive adhesive 4 is provided with a release layer 3. The top surface of the backing layer 1 is provided with a protective layer 2, and a sink 6 is opened on the top surface of the protective layer 2. The foamed polyurethane pressure-sensitive adhesive 4 is arranged inside the sink 6. The top surface of the protective layer 2 is provided with an adhesive surface 5, and the release layer 3 is adhered to the adhesive surface 5. It is composed of the backing layer 1, the foamed polyurethane pressure-sensitive adhesive 4, and the release layer 3. The backing layer 1 is the carrier of the foamed polyurethane pressure-sensitive adhesive 4, having high air permeability, antibacterial property, softness, and tensile property, enhancing the strength of the dressing and preventing bacteria from invading;
[0037] The foamed polyurethane pressure-sensitive adhesive 4 has both the porosity and air permeability of a foam dressing, which can adsorb wound exudate and provide a dry and moist environment for the wound; it also has the adhesive property of a pressure-sensitive adhesive, with better adhesive ability than acrylate pressure-sensitive adhesive and no residue on the skin, and can be pasted repeatedly.
[0038] The function of the release layer 3 is to protect the foamed polyurethane pressure-sensitive adhesive 4 and prevent the pressure-sensitive adhesive from being contaminated and affecting the use. Its material is paper or film, such as glassine release paper, CCK release paper, PET film, PE film, etc.;
[0039] Please refer to Figure 3 , Figure 4 and Figure 5, a warping prevention mechanism is provided on the top surface of the release layer 3. The warping prevention mechanism includes a hollow cylinder 7, a fixing strip 10, a folding strip 11 and a sticker 12. A plurality of hollow cylinders 7 are provided on the top surface of the release layer 3, and the inside of the hollow cylinder 7 is hollow. Two fixing strips 10 are provided inside the hollow cylinder 7. A bent folding strip 11 is provided on the top surfaces of the two fixing strips 10. Another adhesive surface 5 is provided on the bottom surface of the folding strip 11, and a sticker 12 is provided on the surface of the adhesive surface 5. When the folding strip 11 is pulled out, the sticker 12 is torn off, and the folding strip 11 is adhered to the skin, which can play a role in limiting the device, thereby realizing warping prevention;
[0040] Through grooves are provided on the top surfaces of both sides of the hollow cylinder 7, and movable blocks 8 are provided in the through grooves in a matching manner. A handle 9 is fixedly connected to the top surface of the movable block 8. The handle 9 facilitates the pulling out of the movable block 8. The movable block 8 can protect the inside of the hollow cylinder 7 to prevent the internal items from falling off. A first magic tape 14 is fixedly connected to the bottom surface of the fixing strip 10. A reserved groove is provided on the inner bottom surface of the hollow cylinder 7, and a second magic tape 15 that matches the first magic tape 14 is provided in the reserved groove. The first magic tape 14 and the second magic tape 15 can limit the fixing strip 10. A pull rope 13 is provided on the top surface of the sticker 12, and one end of the pull rope 13 abuts against the side surface of the movable block 8. The pull rope 13 facilitates the pulling out of the sticker 12 and the folding strip 11 from the hollow cylinder 7. Four groups of hollow cylinders 7 are provided, and the hollow cylinders 7 are distributed at the four corners of the top surface of the release layer 3. The hollow cylinders 7 are evenly distributed, which is convenient for limiting and preventing warping at the four corners of the device. The hollow cylinder 7 is of a silica gel block structure, and the movable block 8 is of a rubber block mechanism. Both the hollow cylinder 7 and the movable block 8 have elastic and stretchable characteristics, which cause less pressure on the patient's skin and increase the comfort of the patient's use.
[0041] The implementation principle of this embodiment is as follows: The backing layer 1 has the functions of waterproofing and antibacterial, and at the same time has a certain water vapor permeability, which can enable the skin sweat at the sticking part to be discharged normally, preventing maceration or water vapor accumulation. Materials such as polyurethane film (PU), polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc. can be selected. A polyurethane pressure-sensitive adhesive mixed with physical foaming microspheres is coated on the backing layer 1, and then the release layer 3 is covered on the pressure-sensitive adhesive layer, and foamed polyurethane pressure-sensitive adhesive 4 is obtained by foaming at high temperature. The physical foaming microspheres are heat-expandable foaming microspheres with a diameter between 10 and 30 μm. After high-temperature expansion, the size of the microspheres reaches 100 μm to 500 μm, that is, the diameter of the bubble holes; the thickness of the foamed polyurethane pressure-sensitive adhesive is controlled at 1.0 mm to 7 mm;
[0042] After hydrophilic polyurethane pressure-sensitive adhesive is foamed by physical micro-foaming technology and then compounded and cut with the backing layer 1 and the release layer 3, a foamed polyurethane pressure-sensitive adhesive 4 foam dressing is obtained. The thickness of the polyurethane pressure-sensitive adhesive foam is between 1.0 mm and 7 mm, and the foam pore diameter is controlled at 20 μm to 200 μm;
[0043] The function of the release layer 3 is to protect the foamed polyurethane pressure-sensitive adhesive 4 to prevent the pressure-sensitive adhesive from being contaminated and affecting its use. Its material is paper or film, such as Glassine release paper, CCK release paper, PET release film, PE release film, PP release film, etc., and its grammage per square meter is between 40 g / ㎡ and 120 g / ㎡.
[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.
Claims
1. A foamed polyurethane pressure-sensitive adhesive wound dressing, comprising a backing layer (1) and a foamed polyurethane pressure-sensitive adhesive (4), wherein the top surface of the backing layer (1) is provided with the foamed polyurethane pressure-sensitive adhesive (4), characterized in that: The top surface of the foamed polyurethane pressure-sensitive adhesive (4) is provided with a release layer (3), the top surface of the backing layer (1) is provided with a protective layer (2), and a sink groove (6) is provided on the top surface of the protective layer (2), the foamed polyurethane pressure-sensitive adhesive (4) is arranged inside the sink groove (6), the top surface of the protective layer (2) is provided with an adhesive surface (5), and the release layer (3) is adhered to the adhesive surface (5), and the top surface of the release layer (3) is provided with an anti-warping mechanism.
2. The foamed polyurethane pressure-sensitive adhesive wound dressing according to claim 1, characterized in that: The anti-warping mechanism comprises a hollow tube (7), a fixing strip (10), a folding strip (11) and a sticker (12); a plurality of hollow tubes (7) are arranged on the top surface of the release layer (3); the interior of the hollow tube (7) is hollow; two fixing strips (10) are arranged inside the hollow tube (7); the top surfaces of the two fixing strips (10) are provided with a bent folding strip (11); the bottom surfaces of the folding strips (11) are provided with another adhesive surface (5); and the surface of the adhesive surface (5) is provided with a sticker (12).
3. The foamed polyurethane pressure-sensitive adhesive wound dressing according to claim 2, characterized in that: Through grooves are provided on the top surfaces of both sides of the hollow cylinder (7), and matching movable blocks (8) are arranged in the through grooves. A handle (9) is fixedly connected to the top surface of the movable block (8).
4. The foamed polyurethane pressure-sensitive adhesive wound dressing according to claim 2, characterized in that: The bottom surface of the fixing strip (10) is fixedly connected with a Velcro 1 (14), and the inner bottom surface of the hollow tube (7) is provided with a reserved groove, and a Velcro 2 (15) matching with the Velcro 1 (14) is arranged in the reserved groove.
5. The foamed polyurethane pressure-sensitive adhesive wound dressing according to claim 3, characterized in that: A drawstring (13) is provided on the top surface of the sticker (12), and one end of the drawstring (13) abuts against the side surface of the movable block (8).
6. The foamed polyurethane pressure-sensitive adhesive wound dressing according to claim 2, characterized in that: Four groups of the hollow tubes (7) are provided, and the hollow tubes (7) are distributed at the four corners of the top surface of the release layer (3).
7. The foamed polyurethane pressure-sensitive adhesive wound dressing according to claim 3, characterized in that: The hollow cylinder (7) is a silica gel block structure, and the movable block (8) is a rubber block structure.