A self-adhesive polyurethane foam dressing bandage and a method of making the same

Abstract

This invention provides a self-adhesive polyurethane foam dressing bandage, comprising: a self-adhesive elastic bandage layer; an impermeable layer disposed on the self-adhesive elastic bandage layer; the impermeable layer having a mesh size of 80-800 mesh; a polyurethane foam dressing layer disposed on the impermeable layer; and release paper disposed on the polyurethane foam dressing layer. The dressing bandage of this invention simultaneously possesses the characteristics of both polyurethane foam dressing and self-adhesive elastic bandage, exhibiting excellent liquid absorption, comfort, and breathability. It also achieves self-adhesion through pressure and can be dynamically adjusted and fixed according to the wound condition, location, and user experience. The preparation method is simple and low-cost, enabling industrial production. Furthermore, the introduction of the impermeable layer effectively prevents the polyurethane foam dressing from permeating through the bandage during the foaming process, thus affecting its self-adhesive fixation. This dressing bandage can be applied to various wound dressings, healing rehabilitation, and joint protection.

Description

[0001] This application is a divisional application of Chinese patent application filed on September 14, 2022, with application number 202211119260.1 and invention title "A self-adhesive polyurethane foam dressing bandage and its preparation method". Technical Field

[0002] This invention relates to the field of materials technology, and in particular to a self-adhesive polyurethane foam dressing bandage and its preparation method. Background Technology

[0003] A wound is an injury to human tissue or organ caused by physical, chemical, or other factors, and it is extremely common in daily life. However, if a wound is ignored or not properly treated, it can lead to suppuration and infection, become slow to heal, and even endanger life due to systemic infections and tetanus.

[0004] In recent decades, the "moist wound healing theory" has become the standard method for wound management, leading to the mainstream adoption of moist dressings, with polyurethane foam dressings being the most common. Polyurethane foam dressings are typically fixed to the wound surface using adhesives, medical films, gauze, or adhesive tape, but these methods have many limitations. For example, while using adhesives and tape to fix polyurethane foam dressings is simple and secure, it has poor breathability, easily causing skin allergies, itching, and redness. Using gauze to bind polyurethane foam dressings, while offering excellent breathability and avoiding skin allergies, is not secure and easily falls off, greatly restricting the user's movement. Medical films providing full coverage of polyurethane foam dressings are easy to use and waterproof, but they also suffer from poor breathability, allergies, and discomfort.

[0005] Some existing technologies have proposed combining polyurethane foam dressings with bandages to address the aforementioned problems, but these methods have shortcomings. For example, the technical feature of "a burn first aid dressing bandage" (CN 205667607 U) is that the dressing bandage includes a self-adhesive elastic bandage, a bamboo charcoal fiber fabric layer, and a polyurethane absorbent dressing layer, with each layer connected by sewing thread. It can quickly treat wounds immediately after a burn occurs, but its preparation method is complicated, and its comfort and breathability are relatively poor.

[0006] Therefore, providing a self-adhesive dressing bandage that is simple to prepare, low in cost, comfortable, breathable, has excellent liquid absorption, is non-toxic and non-allergenic, and can be elastically adjusted according to the wound condition, location, and user's experience is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the technical problem to be solved by the present invention is to provide a self-adhesive polyurethane foam dressing bandage. The dressing bandage provided by the present invention not only has the advantages of good comfort and good liquid absorption of polyurethane foam dressing, but also has the characteristics of good breathability, no biological toxicity and no skin allergy, and can be fixed to the application site by pressure to generate self-adhesion.

[0008] This invention provides a self-adhesive polyurethane foam dressing bandage, comprising:

[0009] Self-adhesive elastic bandage layer;

[0010] An impermeable layer is disposed on the self-adhesive elastic bandage layer; the mesh size of the impermeable layer is 80 mesh to 800 mesh;

[0011] A polyurethane foam dressing layer disposed on the impermeable layer;

[0012] Release paper disposed on the polyurethane foam dressing layer;

[0013] The method for preparing the self-adhesive polyurethane foam dressing bandage includes the following steps:

[0014] A) Place the self-adhesive elastic bandage and the waterproof layer into the mold in sequence;

[0015] B) Place the polyurethane foam dressing material on the impermeable layer to obtain the polyurethane foam dressing layer;

[0016] C) Place the release paper on the polyurethane foam dressing layer to obtain the molded bandage;

[0017] D) Heat-treat and sterilize the shaped bandage to obtain the final product.

[0018] In some specific embodiments, the self-adhesive elastic bandage layer material is a polyester elastic bandage.

[0019] In some specific embodiments, the length of the self-adhesive elastic bandage is 20mm to 1000mm and the width is 10mm to 200mm.

[0020] In some specific embodiments, the material of the impermeable layer is one or more of cotton cloth, polyester-cotton cloth, linen cloth, silk cloth, nylon cloth, polyester cloth, acrylic cloth, polypropylene cloth, spandex cloth, carbon fiber cloth, or flannel.

[0021] In some specific embodiments, the impermeable layer is a single layer or multiple layers.

[0022] In some specific embodiments, the thickness of the impermeable layer is <1.5mm.

[0023] In some specific embodiments, the polyurethane foam dressing layer is formed by mixing and foaming component A and component B; the mass ratio of component A to component B is 1:(0.7~1.7).

[0024] Component A is a polyether triol and diisocyanate oligomer; Component B is one or more of surfactants, foaming agents, catalysts, and color pastes.

[0025] In some specific embodiments, the release paper is one of single-silicone single-sealing, double-silicone, single-silicone, or coated paper.

[0026] In some specific embodiments, the dimensions of the mold are: length 10mm~500mm; width 10mm~100mm; thickness 1mm~10mm.

[0027] In some specific embodiments, the heat treatment temperature in step D) is 37℃~120℃, the time is 0.5h~24h, and the sterilization is ethylene oxide sterilization.

[0028] This invention provides the application of the self-adhesive elastic bandage dressing described in any one of the above claims in the preparation of products for wound dressing, healing and rehabilitation, or joint protection.

[0029] Compared with the prior art, the present invention provides a self-adhesive polyurethane foam dressing bandage, comprising:

[0030] A self-adhesive elastic bandage layer; an impermeable layer disposed on the self-adhesive elastic bandage layer; the mesh size of the impermeable layer is 80 mesh to 800 mesh; a polyurethane foam dressing layer disposed on the impermeable layer; release paper disposed on the polyurethane foam dressing layer; the preparation method of the self-adhesive polyurethane foam dressing bandage includes the following steps: A) placing the self-adhesive elastic bandage and the impermeable layer into a mold in sequence; B) placing the polyurethane foam dressing raw material on the impermeable layer to obtain the polyurethane foam dressing layer; C) placing the release paper on the polyurethane foam dressing layer to obtain the formed bandage; D) heat-treating and sterilizing the formed bandage to obtain the final product. The dressing bandage of this invention possesses the characteristics of both polyurethane foam dressings and self-adhesive elastic bandages. It not only boasts excellent liquid absorption, comfort, and breathability, but also achieves self-adhesion through pressure and can be dynamically adjusted and fixed according to the wound condition, location, and user experience. The preparation method is simple and inexpensive, enabling industrial production. Furthermore, the introduction of an impermeable layer effectively prevents the polyurethane foam dressing from permeating through the bandage during the foaming process, thus maintaining its self-adhesive fixation. This dressing bandage can be applied to various wound dressings, healing and rehabilitation, and joint protection. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the self-adhesive elastic bandage dressing prepared in Example 1 of the present invention. Detailed Implementation

[0032] This invention provides a self-adhesive polyurethane foam dressing bandage and its preparation method. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve the same result. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and fall within the scope of protection of this invention. The method and application of this invention have been described through preferred embodiments. Those skilled in the art can clearly modify or appropriately change and combine the method and application described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

[0033] This invention provides a self-adhesive polyurethane foam dressing bandage, comprising:

[0034] Self-adhesive elastic bandage layer;

[0035] An impermeable layer is disposed on the self-adhesive elastic bandage layer; the mesh size of the impermeable layer is 80 mesh to 800 mesh;

[0036] A polyurethane foam dressing layer disposed on the impermeable layer;

[0037] Release paper disposed on the polyurethane foam dressing layer.

[0038] The method for preparing the self-adhesive polyurethane foam dressing bandage includes the following steps:

[0039] A) Place the self-adhesive elastic bandage and the waterproof layer into the mold in sequence;

[0040] B) Place the polyurethane foam dressing material on the impermeable layer to obtain the polyurethane foam dressing layer;

[0041] C) Place the release paper on the polyurethane foam dressing layer to obtain the molded bandage;

[0042] D) Heat-treat and sterilize the shaped bandage to obtain the final product.

[0043] The dressing bandage provided in this application not only has the advantages of good comfort and good liquid absorption of polyurethane foam dressings, but also has the characteristics of good breathability, no biotoxicity and no skin allergies, and can be fixed to the application site by pressure to generate self-adhesion; in addition, the dressing bandage provided in this application has a simple preparation method, low cost and high production efficiency.

[0044] The self-adhesive polyurethane foam dressing bandage provided by this invention includes a self-adhesive elastic bandage layer. The self-adhesive elastic bandage in the self-adhesive polyurethane foam dressing bandage and its preparation method is a polyester elastic bandage that is self-adhesive and fixed by pressure, without being secured by adhesives, Velcro, tape, buckles, or hooks. The self-adhesive elastic bandage in the self-adhesive polyurethane foam dressing bandage and its preparation method has a length of 20mm to 1000mm and a width of 10mm to 200mm; preferably, the self-adhesive elastic bandage has a length of 30mm to 900mm and a width of 20mm to 180mm.

[0045] In this invention, the self-adhesive elastic bandage and the waterproof layer are placed sequentially into a suitable mold and laid flat.

[0046] The self-adhesive elastic bandage in the self-adhesive polyurethane foam dressing bandage should fill the mold, while the remaining part can remain outside the mold.

[0047] In one preferred embodiment of the present invention, the self-adhesive elastic bandage has a length of 100mm~400mm and a width of 50mm~100mm, with its long end horizontally aligned with the long end of the mold, and the rest remaining outside the mold.

[0048] The self-adhesive polyurethane foam dressing bandage provided by the present invention includes an impermeable layer disposed on the self-adhesive elastic bandage layer.

[0049] The waterproof layer of the present invention is made of one or more of the following materials: cotton fabric, cotton-polyester blend fabric, linen fabric, silk fabric, nylon fabric, polyester fabric, acrylic fabric, polypropylene fabric, spandex fabric, carbon fiber fabric, or flannel. Preferably, the waterproof layer in the self-adhesive polyurethane foam dressing bandage and its preparation method is one or both of nylon fabric and cotton fabric.

[0050] The impermeable layer in the self-adhesive polyurethane foam dressing bandage and its preparation method can be a single layer or multiple layers depending on the mesh size. The mesh size of the impermeable layer in the self-adhesive polyurethane foam dressing bandage can be 80 mesh to 800 mesh.

[0051] In some specific embodiments of the present invention, the impermeable layer in the self-adhesive polyurethane foam dressing bandage is a single layer of 500-800 mesh.

[0052] In some specific embodiments of the present invention, the impermeable layer in the self-adhesive polyurethane foam dressing bandage is a multilayer structure of 80-120 mesh and 500-600 mesh.

[0053] The self-adhesive polyurethane foam dressing bandage provided by the present invention includes a polyurethane foam dressing layer disposed on the impermeable layer.

[0054] The thickness of the impermeable layer in this invention is <1.5mm, and the thickness of the polyurethane foam dressing layer is <7mm.

[0055] Specifically, the polyurethane foam dressing layer is formed by mixing and foaming component A and component B; the mass ratio of component A to component B is 1:(0.7~1.7).

[0056] Component A consists of polyether triol and diisocyanate oligomers; Component B consists of one or more of surfactants, foaming agents, catalysts, and color pastes.

[0057] This invention allows for the mixing of polyurethane foam dressing components A and B until they emulsify and turn white, then pouring them into a mold, or for the foaming of components A and B using a foaming machine and pouring them into a mold.

[0058] The self-adhesive polyurethane foam dressing bandage provided by the present invention includes a release paper disposed on the polyurethane foam dressing layer.

[0059] According to the present invention, the release paper is one of single-silicone single-sealing, double-silicone, single-silicone, or coated paper.

[0060] The self-adhesive polyurethane foam dressing bandage provided by this invention not only has the advantages of good comfort and good liquid absorption of polyurethane foam dressings, but also has the characteristics of good breathability, no biotoxicity and no skin allergy, and convenient use and fixation; in addition, the preparation method of the self-adhesive polyurethane foam dressing bandage is simple and low cost.

[0061] This invention provides a method for preparing the self-adhesive polyurethane foam dressing bandage according to any one of the above technical solutions, comprising the following steps:

[0062] A) Place the self-adhesive elastic bandage and the waterproof layer into the mold in sequence;

[0063] B) Place the polyurethane foam dressing material on the impermeable layer to obtain the polyurethane foam dressing layer;

[0064] C) Place the release paper on the polyurethane foam dressing layer to obtain the molded bandage;

[0065] D) Heat-treat and sterilize the shaped bandage to obtain the final product.

[0066] The present invention provides a method for preparing a self-adhesive polyurethane foam dressing bandage as described in any one of the above technical solutions, wherein the self-adhesive elastic bandage and the impermeable layer are placed into a mold in sequence.

[0067] Place the self-adhesive elastic bandage and the waterproof layer into a suitable mold and lay them flat. Preferably, first lay the self-adhesive elastic bandage flat in the mold, with its long end horizontally aligned with the long end of the mold, and leave the rest outside the mold. Then lay the waterproof layer flat on the self-adhesive elastic bandage.

[0068] The mold cavity in the self-adhesive polyurethane foam dressing bandage and its preparation method has a length of 10mm to 500mm, a width of 10mm to 100mm, and a thickness of 1mm to 10mm. Preferably, the mold cavity in the self-adhesive polyurethane foam dressing bandage has a length of 50mm to 100mm, a width of 50mm to 100mm, and a thickness of 2mm to 6mm.

[0069] The polyurethane foam dressing material is placed on the impermeable layer to obtain the polyurethane foam dressing layer.

[0070] Specifically, the polyurethane foam dressing layer is formed by mixing and foaming component A and component B; the mass ratio of component A to component B is 1:(0.7~1.7). Optionally, the mass ratio of component A to component B can be 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.2, 1:1.4, 1:1.6, or 1:1.7. Within this range, the polyurethane foam dressing layer after foaming can be guaranteed to have uniform pores and meet the requirements for liquid absorption and air permeability. The technical problem of this invention can be solved within the above-mentioned range of proportions.

[0071] Component A is a polyether triol and diisocyanate oligomer; Component B is one or more of a surfactant, foaming agent, catalyst, and colorant. This invention does not limit the specific components; those skilled in the art can use any known components. All of the above components can solve the technical problems of this invention.

[0072] This invention allows for the mixing of polyurethane foam dressing components A and B until they emulsify and turn white, then pouring them into a mold, or for the foaming of components A and B using a foaming machine and pouring them into a mold.

[0073] Release paper is placed on the polyurethane foam dressing layer to obtain the molded bandage. Release paper is quickly laid on the surface of the polyurethane foam dressing layer, and the mold cover is closed. After the polyurethane foam dressing is molded, the dressing bandage is removed.

[0074] After the polyurethane foam dressing is molded, the self-adhesive polyurethane foam dressing bandage is removed, and then post-processing and sterilization are performed.

[0075] According to the present invention, the heat treatment temperature is 37℃~120℃, the time is 0.5h~24h, and the sterilization is ethylene oxide sterilization.

[0076] In some specific embodiments of the present invention, the self-adhesive polyurethane foam dressing bandage and its preparation method are heat-treated in an oven at 37°C to 120°C for 0.5h to 24h and then sterilized with ethylene oxide.

[0077] In some specific embodiments of the present invention, the self-adhesive polyurethane foam dressing bandage and its preparation method are heat-treated in an oven at 70℃~100℃ for 2h~4h and then sterilized with ethylene oxide.

[0078] This invention provides the application of the self-adhesive elastic bandage dressing described in any one of the above claims in the preparation of products for wound dressing, healing and rehabilitation, or joint protection.

[0079] This application provides a self-adhesive polyurethane foam dressing bandage comprising a self-adhesive elastic bandage, an impermeable layer, a polyurethane foam dressing, and a release paper, and a method for preparing the same. The dressing bandage possesses the characteristics of both polyurethane foam dressings and self-adhesive elastic bandages, exhibiting excellent liquid absorption, comfort, and breathability. It also achieves self-adhesion through pressure and can be dynamically adjusted and fixed according to the wound condition, location, and user comfort. The preparation method is simple, low-cost, and suitable for industrial production. Furthermore, the introduction of the impermeable layer effectively prevents the polyurethane foam dressing from permeating through the bandage during the foaming process, thus maintaining its self-adhesive fixation. The dressing bandage can be applied to various wound dressings, healing and rehabilitation, and joint protection.

[0080] Figure 1 This is a schematic diagram of the structure of the self-adhesive elastic bandage dressing prepared in Example 1 of the present invention. The bandage consists of a self-adhesive elastic bandage (1), an impermeable layer (2), a polyurethane foam dressing (3), and release paper (4).

[0081] To further illustrate the present invention, the following describes in detail, with reference to embodiments, a self-adhesive polyurethane foam dressing bandage and its preparation method.

[0082] Example 1

[0083] Prepare a self-adhesive polyurethane foam dressing bandage according to the following steps ( Figure 1): ① Select a mold with an inner cavity length of 80mm, a width of 80mm, and a thickness of 5mm; ② Cut the self-adhesive elastic bandage (1) to a length of 450mm and a width of 80mm and lay it flat inside the mold, with its long end horizontally centered with the long end of the mold, and the rest left outside the mold; ③ Lay 500-mesh nylon cloth as a seepage-proof layer (2) on the self-adhesive elastic bandage (1) in step ②; ④ Place the A and B components of the polyurethane foam dressing (3) on After foaming by mechanical stirring (1200 rpm, 12 s) at room temperature, the foam is poured onto the impermeable layer (2) in step ③; ⑤ The single-silicone single-sealing release paper (4) is laid flat on the polyurethane foam dressing (3) in step ④, and the mold lid is quickly closed; ⑥ After the polyurethane foam dressing (3) is formed, the self-adhesive polyurethane foam dressing bandage is taken out from the mold and placed in a 70℃ oven for heat treatment for 2 hours; ⑦ The finally obtained self-adhesive polyurethane foam dressing bandage is sterilized with ethylene oxide. The self-adhesive polyurethane foam dressing bandage prepared in Example 1 was placed in a sterile environment for 14 days and then its performance was tested. The results are shown in Table 1.

[0084] Example 2

[0085] Prepare self-adhesive polyurethane foam dressing bandages according to the following steps: ① Select a mold with an inner cavity length of 200mm, a width of 50mm, and a thickness of 3mm; ② Cut the self-adhesive elastic bandage (1) to a length of 600mm and a width of 70mm and lay it flat inside the mold, with its horizontal center inside the mold and the rest outside the mold; ③ Use 300-mesh nylon cloth, 200-mesh gauze, and 80-mesh polyester cloth as waterproof layers (2) and lay them flat in sequence on the self-adhesive elastic bandage (1) from step ②. ) ; ④ After foaming the A and B components of the polyurethane foam dressing (3) at room temperature using a foaming machine, pour it onto the impermeable layer (2) in step ③; ⑤ Lay the double silicone release paper (4) flat on the polyurethane foam dressing (3) in step ④, and quickly cover it with the mold lid; ⑥ After the polyurethane foam dressing (3) is formed, remove the self-adhesive polyurethane foam dressing bandage from the mold and place it in a 100℃ oven for heat treatment for 1 hour; ⑦ Sterilize the finally obtained self-adhesive polyurethane foam dressing bandage with ethylene oxide. The self-adhesive polyurethane foam dressing bandage prepared in Example 2 was placed in a sterile environment for 14 days and then its performance was tested. The results are shown in Table 1.

[0086] Example 3

[0087] Prepare a self-adhesive polyurethane foam dressing bandage according to the following steps: ① Select a mold with an inner cavity length of 20mm, a width of 10mm, and a thickness of 2mm; ② Cut the self-adhesive elastic bandage (1) to a length of 50mm and a width of 10mm and lay it flat inside the mold, with its long end horizontally centered with the long end of the mold, and the rest left outside the mold; ③ Use 600-mesh gauze and 200-mesh silk cloth as an impermeable layer (2) and lay them flat on the self-adhesive elastic bandage (1) in step ②; ④ Add polyurethane foam... The A and B components of the foam dressing (3) were foamed at room temperature by mechanical stirring (1500 rpm, 9 s) and then poured onto the impermeable layer (2) in step ③; ⑤ The coated release paper (4) was laid flat on the polyurethane foam dressing (3) in step ④, and the mold lid was quickly closed; ⑥ After the polyurethane foam dressing (3) was formed, the self-adhesive polyurethane foam dressing bandage was taken out from the mold and placed in a 37℃ oven for heat treatment for 24 h; ⑦ The finally obtained self-adhesive polyurethane foam dressing bandage was sterilized with ethylene oxide. The self-adhesive polyurethane foam dressing bandage prepared in Example 3 was placed in a sterile environment for 14 days and then its performance was tested. The results are shown in Table 1.

[0088] Example 4

[0089] Prepare self-adhesive polyurethane foam dressing bandages according to the following steps: ① Select a mold with an inner cavity length of 200mm, a width of 60mm, and a thickness of 8mm; ② Cut the self-adhesive elastic bandage (1) into a length of 800mm and a width of 60mm and lay it flat inside the mold, with its long end 20mm away from the long end of the mold and horizontally centered, leaving the rest outside the mold; ③ Use 400-mesh polyester-cotton fabric and 200-mesh polypropylene fabric as waterproof layers (2) and lay them flat in sequence on the self-adhesive elastic bandage in step ②. ④ After foaming the A and B components of the polyurethane foam dressing (3) at room temperature using a foaming machine, pour them onto the impermeable layer (2) in step ③; ⑤ Lay the single-silicone release paper (4) flat on the polyurethane foam dressing (3) in step ④, and quickly cover it with the mold lid; ⑥ After the polyurethane foam dressing (3) is formed, remove the self-adhesive polyurethane foam dressing bandage from the mold and place it in a 50℃ oven for heat treatment for 12 hours; ⑦ Sterilize the finally obtained self-adhesive polyurethane foam dressing bandage with ethylene oxide. The self-adhesive polyurethane foam dressing bandage prepared in Example 4 was placed in a sterile environment for 14 days and then its performance was tested. The results are shown in Table 1.

[0090] Comparative Example 1

[0091] Prepare self-adhesive polyurethane foam dressing bandages according to the following steps: ① Select a mold with an inner cavity length of 80mm, a width of 80mm, and a thickness of 5mm; ② Cut the self-adhesive elastic bandage to a length of 450mm and a width of 80mm and lay it flat inside the mold, with its long end horizontally centered with the long end of the mold, leaving the rest outside the mold; ③ Do not add an anti-seepage layer; ④ After foaming the polyurethane foam dressing components A and B at room temperature using mechanical stirring (1200rpm, 12s), pour them onto the anti-seepage layer in step ③; ⑤ Lay the single-seal release paper flat on the polyurethane foam dressing in step ④ and quickly cover the mold with the lid; ⑥ After the polyurethane foam dressing has formed, remove the self-adhesive polyurethane foam dressing bandage from the mold and heat-treat it in a 70℃ oven for 2 hours; ⑦ Sterilize the final self-adhesive polyurethane foam dressing bandage with ethylene oxide. The polyurethane foam dressing bandage prepared in Comparative Example 1 was placed in a sterile environment for 14 days and then its performance was tested. The results are shown in Table 2.

[0092] Comparative Example 2

[0093] Prepare polyurethane foam dressing bandages according to the following steps: ① Select a mold with an inner cavity length of 80mm, a width of 80mm, and a thickness of 5mm; ② Cut medical gauze to a length of 450mm and a width of 80mm and lay it flat inside the mold, with its long end horizontally centered with the long end of the mold, leaving the rest outside the mold; ③ Lay 500-mesh nylon cloth as an impermeable layer on the medical gauze from step ②; ④ After foaming polyurethane foam dressing components A and B at room temperature using mechanical stirring (1200rpm, 12s), pour the foam onto the impermeable layer from step ③; ⑤ Lay single-sided silicone single-sealing release paper flat on the polyurethane foam dressing from step ④ and quickly cover the mold with the lid; ⑥ After the polyurethane foam dressing has formed, remove the polyurethane foam dressing bandage from the mold and heat-treat it in a 70℃ oven for 2 hours; ⑦ Sterilize the final polyurethane foam dressing bandage with ethylene oxide. The polyurethane foam dressing bandage prepared in Comparative Example 2 was subjected to performance testing after being placed in a sterile environment for 14 days. The results are shown in Table 2.

[0094] Comparative Example 3

[0095] The self-adhesive gauze dressing bandage was prepared according to the following steps: ① Select a mold with an inner cavity length of 80mm, a width of 80mm, and a thickness of 5mm; ② Cut the self-adhesive elastic bandage to a length of 450mm and a width of 80mm and lay it flat inside the mold, with its long end horizontally centered with the long end of the mold, and the rest outside the mold; ③ Lay 5 layers of medical gauze flat on the self-adhesive elastic bandage from step ②; ④ Sew the self-adhesive elastic bandage and medical gauze together using a straight stitch; ⑤ Sterilize the final polyurethane foam dressing bandage with ethylene oxide. The gauze dressing bandage prepared in Comparative Example 3 was placed in a sterile environment for 14 days, and its performance was tested. The results are shown in Table 2.

[0096] The dressings and bandages prepared in Examples 1-4 and Comparative Examples 1-3 were subjected to performance tests, and the results are shown in Tables 1 and 2. Comfort was evaluated using stretchability and permanent deformation, in accordance with YY / T 0471.4-2004; lower values ​​indicate higher comfort. Liquid absorbency was evaluated using absorption time, non-swelling absorption capacity, and liquid retention rate, in accordance with Chinese Invention Patent CN 1741824A and YY / T 0471.1-2004, 3.2, respectively; shorter absorption time indicates better hydrophilicity, and higher non-swelling absorption capacity and liquid retention rate indicate stronger liquid retention capacity. Gas permeability was evaluated using liquid permeability and water vapor permeability, in accordance with YY / T 0471.1-2004, 3.3 and YY / T 0471.2-2004, respectively; higher values ​​indicate better air permeability. Cytotoxicity was evaluated according to the national standard GB / T 16886.5-2003. The smaller the value, the non-toxic and safe the bandage dressing is.

[0097] Table 1 Performance data of self-adhesive elastic dressing bandages prepared in Examples 1-4

[0098]

[0099] Table 2 Performance data of dressings and bandages prepared in Comparative Examples 1-3

[0100]

[0101] The results show that the comfort and breathability of self-adhesive polyurethane foam dressings mainly depend on the type, number of layers, and mesh count of the impermeable layer. Meanwhile, polyurethane foam dressings without an impermeable layer (Comparative Example 1) lose their self-adhesiveness, making them very inconvenient to use. The liquid absorption performance of self-adhesive polyurethane foam dressings mainly depends on the properties of the polyurethane foam dressing. If a non-polyurethane foam dressing is used (Comparative Example 3), the liquid absorption performance is greatly reduced, which is not conducive to the absorption of wound exudate and easily leads to wound adhesion and pain. Furthermore, if a non-self-adhesive elastic bandage is used (Comparative Example 2), the fixation is usually not secure or breathable, leading to dressing detachment and skin allergies. All dressing samples from the examples and comparative examples are non-toxic and do not affect normal tissue healing.

[0102] This application provides a self-adhesive elastic bandage dressing. Taking a wound 5cm above the elbow joint of the left arm as an example, the usage method of Example 1 is briefly described as follows: ① Cover the wound surface with the dressing layer of the bandage dressing; ② Pick up one end of the self-adhesive elastic bandage and start wrapping it around; ③ Press the end of the self-adhesive elastic bandage onto the surface of the already wrapped bandage, and it will self-adhere and fix; ④ After using it for a certain period of time, unwrap the bandage.

[0103] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A self-adherent polyurethane foam dressing bandage characterized by, include: Self-adhesive elastic bandage layer; An impermeable layer is disposed on the self-adhesive elastic bandage layer; the mesh size of the impermeable layer is 80 mesh to 800 mesh; A polyurethane foam dressing layer disposed on the impermeable layer; Release paper disposed on the polyurethane foam dressing layer; The method for preparing the self-adhesive polyurethane foam dressing bandage includes the following steps: A) Place the self-adhesive elastic bandage and the waterproof layer into the mold in sequence; B) Place the polyurethane foam dressing material on the impermeable layer to obtain the polyurethane foam dressing layer; C) Place the release paper on the polyurethane foam dressing layer to obtain the molded bandage; D) Heat-treat and sterilize the shaped bandage to obtain the final product.

2. The self-adhering polyurethane foam dressing bandage according to claim 1, characterized in that, The self-adhesive elastic bandage layer material is polyester elastic bandage.

3. The self-adhering polyurethane foam dressing bandage of claim 2, wherein, The self-adhesive elastic bandage has a length of 20mm to 1000mm and a width of 10mm to 200mm.

4. The self-adhesive polyurethane foam dressing bandage according to claim 2, characterized in that, The material of the impermeable layer is one or more of the following: cotton cloth, polyester-cotton cloth, linen cloth, silk cloth, nylon cloth, polyester cloth, nylon cloth, acrylic cloth, polypropylene cloth, spandex cloth, carbon fiber cloth, or flannel.

5. The self-adhesive polyurethane foam dressing bandage according to claim 2, characterized in that, The impermeable layer may be a single layer or multiple layers; the thickness of the impermeable layer is <1.5mm.

6. The self-adhesive polyurethane foam dressing bandage according to claim 1, characterized in that, The polyurethane foam dressing layer is formed by mixing and foaming component A and component B; the mass ratio of component A to component B is 1:(0.7~1.7). Component A consists of polyether triol and diisocyanate oligomers; Component B consists of one or more of surfactants, foaming agents, catalysts, and color pastes.

7. The self-adhesive polyurethane foam dressing bandage according to claim 1, characterized in that, The release paper is one of the following: single-silicone single-sealing, double-silicone, single-silicone, or coated paper.

8. The self-adhesive polyurethane foam dressing bandage according to claim 1, characterized in that, The specific dimensions of the mold are: length 10mm~500mm; width 10mm~100mm; thickness 1mm~10mm.

9. The self-adhesive polyurethane foam dressing bandage according to claim 1, characterized in that, Step D) The heat treatment temperature is 37℃~120℃, the time is 0.5h~24h, and the sterilization is ethylene oxide sterilization.

10. The use of the self-adhesive elastic bandage dressing according to any one of claims 1 to 9 in the preparation of products for wound dressing, healing and rehabilitation or joint protection.

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