PTFE dressing
By using a design that incorporates two layers of PTFE membrane, a hydrogel layer, and a color-developing layer in the dressing, the problem of poor waterproofness and breathability of existing dressings is solved, achieving wound dryness and breathability. The color-developing layer indicates when to change the dressing, improving its effectiveness.
Patent Information
- Application Number
- CN202521083629.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-29
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-05-29
AI Technical Summary
Existing dressings have poor waterproof and breathable properties, making it difficult to guarantee wound safety and healing effectiveness.
The waterproof membrane consists of two layers of PTFE membrane. The first hydrogel layer in the middle absorbs water vapor, and the second hydrogel layer on the outside absorbs seepage. A color development layer is provided inside the first hydrogel layer to detect the water vapor content. The dressing layer has a matrix and an elastic layer to provide elasticity.
It achieves two-way drying and blocking of the dressing, keeps the wound dry, prevents external moisture from entering, has good breathability, and the color-developing layer indicates when to change the dressing, thus improving the waterproof, breathable and effective properties of the dressing.
Smart Images
Figure CN224937257U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical supplies technology, and in particular to a PTFE dressing. Background Technology
[0002] In modern medicine, after treating open wounds, it is often necessary to use dressings to cover the wound to protect it from external environmental contamination. At the same time, medication can be applied to the wound to accelerate healing and protect it.
[0003] Existing dressings come in various designs. One type has an outermost adhesive film, which, while providing antibacterial and waterproof protection, is not breathable, causing the wound to remain constantly moist and hindering healing. Another type relies solely on a thick layer of gauze, which also has poor breathability and fails to prevent moisture penetration in humid environments. Once wet, it needs immediate replacement. Therefore, both types require frequent dressing changes, which is detrimental to wound healing. In conclusion, existing dressings have poor waterproof and breathable properties, making it difficult to ensure wound safety. Utility Model Content
[0004] The main purpose of this invention is to provide a PTFE dressing that addresses the problem of poor waterproof and breathable performance of existing dressings.
[0005] To achieve the above objectives, this utility model provides a PTFE dressing, comprising:
[0006] The waterproof membrane layer consists of two layers of PTFE membrane;
[0007] The first hydrogel layer is disposed between the two PTFE membranes and is used to absorb water vapor that enters between the two PTFE membranes;
[0008] A second hydrogel layer, disposed on one side of the waterproof membrane layer, is used to absorb wound exudate; and,
[0009] A dressing layer, disposed on the second hydrogel layer, is used to promote wound healing.
[0010] In one embodiment, the first hydrogel comprises polyvinyl alcohol.
[0011] In one embodiment, the PTFE dressing further includes a color-developing layer disposed within the first hydrogel layer for detecting the water vapor content within the first hydrogel layer.
[0012] In one embodiment, the colorimetric layer comprises urine colorimetric gel.
[0013] In one embodiment, the second hydrogel layer comprises chitosan hydrogel and salicylic acid loaded in the chitosan hydrogel.
[0014] In one embodiment, the dressing layer includes a matrix layer and an elastic layer, the matrix layer being disposed on the second hydrogel layer, and the elastic layer being disposed on the side of the matrix layer away from the second hydrogel layer, wherein the elastic layer is used to provide elasticity.
[0015] In one embodiment, the elastic layer is made of spandex fiber.
[0016] In one embodiment, the substrate layer is made of pure cotton fibers.
[0017] This invention provides a PTFE dressing, wherein a waterproof membrane layer is provided on the dressing layer, comprising two PTFE membranes. During use, the PTFE membranes effectively block liquid penetration into the dressing layer. Simultaneously, exudate from the wound can be absorbed by the second hydrogel layer, ensuring wound dryness and maintaining the effectiveness of the dressing layer. When the dressing absorbs excessive exudate, leading to a humid internal environment, water vapor can evaporate. Since water vapor molecules are smaller than the pores of the PTFE membrane, water vapor can enter between the two PTFE membranes and be absorbed by the first hydrogel layer. This also prevents external water droplets from entering. In humid external environments, the first hydrogel layer can also absorb water vapor, achieving bidirectional drying and blocking of the PTFE dressing, ensuring its waterproof and breathable properties, and improving its effectiveness. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the PTFE dressing structure provided in the embodiment of this utility model.
[0019] Explanation of icon numbers:
[0020] 100. PTFE dressing; 1. Waterproof membrane layer; 11. PTFE membrane; 2. First hydrogel layer; 3. Second hydrogel layer; 4. Dressing layer; 41. Matrix layer; 42. Elastic layer; 5. Color developing layer.
[0021] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0024] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0025] Please see Figure 1 This utility model provides a PTFE dressing 100, including a waterproof membrane layer 1, a first hydrogel layer 2, a second hydrogel layer 3, and a dressing layer 4; the waterproof membrane layer 1 includes two PTFE membranes 11; the first hydrogel layer 2 is disposed between the two PTFE membranes 11 to absorb moisture entering between the two PTFE membranes 11; the second hydrogel layer 3 is disposed on one side of the waterproof membrane layer 1 to absorb wound exudate; the dressing layer 4 is disposed on the second hydrogel layer 3 to promote wound healing.
[0026] This invention provides a PTFE dressing 100, wherein a waterproof membrane layer 1 is provided on the dressing layer 4, and the waterproof membrane layer 1 comprises two PTFE membranes 11. During use, the PTFE membranes 11 can effectively block liquid from penetrating into the dressing layer 4. At the same time, exudate at the wound can be absorbed by the second hydrogel layer 3, ensuring the dryness of the wound and maintaining the effectiveness of the dressing layer 4. When the dressing absorbs too much exudate, resulting in a relatively humid internal environment, water vapor evaporates. Since water vapor molecules are smaller than the pores of the PTFE membrane, water vapor can enter between the two PTFE membranes 11 and be absorbed by the first hydrogel layer 2. Simultaneously, it can also prevent water droplets from the external environment from entering. When the external environment is relatively humid, it can also be absorbed by the first hydrogel layer 2, achieving bidirectional drying and blocking of the PTFE dressing 100, ensuring the waterproof and breathable properties of the PTFE dressing 100, and improving the effectiveness of the PTFE dressing.
[0027] It should be noted that the PTFE membrane 11 is a microporous film produced by special processes such as premixing, extrusion, calendering, and biaxial stretching of polytetrafluoroethylene dispersion resin. It is a waterproof and breathable membrane, belonging to environmentally friendly materials, and has the characteristics of breathability, acid and alkali resistance, and corrosion resistance. The micropore diameter of the PTFE membrane 11 is between 0.1μm and 15μm, which is much smaller than the molecular diameter of general liquids, but larger than the molecular diameter of various components in the air and the molecular diameter of water vapor. Therefore, it can achieve air and moisture permeability, but can also block the penetration of liquid molecules.
[0028] It should be noted that the first hydrogel 2 is disposed between the two PTFE membranes 11. The first hydrogel 2 can swell and retain a large amount of water. Therefore, the first hydrogel 2 only needs to be able to absorb water. There are many implementation methods, such as hydrogels formed by polymer materials such as sodium alginate.
[0029] In this embodiment, the first hydrogel 2 comprises polyvinyl alcohol. It possesses high biocompatibility, permeability, hydrophilicity, and a low coefficient of friction, making it easy to manufacture and cost-controllable.
[0030] The hydrogel formed by polyvinyl alcohol can be molded by stirring and freezing, which will not be described in detail here.
[0031] On the other hand, the PTFE dressing 100 also includes a color-developing layer 5, which is disposed within the first hydrogel layer 2 to detect the water vapor content within the first hydrogel layer 2. In this embodiment, the first hydrogel layer 2 continuously absorbs water vapor molecules from inside and outside the PTFE dressing 100, gradually wetting the environment between the two PTFE membranes 11. To ensure the effective use of the PTFE dressing 100, the water absorption of the first hydrogel layer 2 needs to be kept within a certain range. Therefore, a color-developing layer 5 is disposed within the first hydrogel layer 2. As the water content inside the first hydrogel layer 2 gradually increases, the color component of the color-developing layer 5 changes. Ultimately, the color change can be used to determine whether sufficient water vapor has been adsorbed within the first hydrogel layer 2, thereby determining whether the PTFE dressing 100 needs to be replaced.
[0032] It should be noted that the color-developing layer 5 can be implemented in various ways, as long as it can produce a color change according to water vapor. For example, anhydrous copper sulfate will turn blue after it comes into contact with water; it can also be various acid-base indicators, which can be used to indicate the penetration of outer water vapor or internal seepage liquid, and can also indicate the degree of wetness of the first hydrogel layer 2.
[0033] In this embodiment, the color-developing layer 5 includes a urine-based color-developing gel. It undergoes a color change upon contact with external moisture and also upon contact with internal exudate. This effectively identifies different liquid molecules. During use, a color change in the color-developing layer indicates that moisture has penetrated the waterproof membrane layer 1. Furthermore, the degree of moisture adsorption and the type of adsorbed liquid can be determined based on the extent of the color change, thus indicating whether the PTFE dressing needs to be replaced or secondary wound treatment is required.
[0034] On the other hand, the second hydrogel layer 3 can be implemented in various ways, as long as it can absorb the exudate, such as polyvinyl alcohol hydrogel.
[0035] In this embodiment, the second hydrogel layer 3 comprises chitosan hydrogel and salicylic acid loaded in the chitosan hydrogel. It can effectively absorb exudate from the wound and has a certain bactericidal and disinfecting effect, ensuring wound safety. Simultaneously, the chitosan hydrogel has relatively high biocompatibility and low biotoxicity, avoiding irritation to the wound.
[0036] On the other hand, the dressing layer 4 includes a base layer 41 and an elastic layer 42. The base layer 41 is disposed on the second hydrogel layer 3, and the elastic layer 42 is disposed on the side of the base layer 41 away from the second hydrogel layer 3, wherein the elastic layer is used to provide elasticity. In this embodiment, the waterproof membrane layer 1 is disposed on the base layer 41, and the elastic layer 42 improves the elasticity of the PTFE dressing 100, preventing the waterproof membrane layer from breaking under tension during use.
[0037] Furthermore, the elastic layer 42 is made of spandex fiber. Spandex fiber has good elasticity and low cost, which facilitates the preparation of the PTFE dressing 100.
[0038] It should be noted that in this embodiment, the medication is loaded onto the elastic layer 42 to treat the wound. There are several ways to load the medication onto the elastic layer 42; it can be done by setting a dedicated medication loading layer or by directly coating the wound with the medication, as long as the wound is covered with medication.
[0039] Furthermore, the substrate layer 41 is made of pure cotton fibers. It is soft, comfortable, breathable, and facilitates the transfer of permeate to the second hydrogel layer 3.
[0040] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A PTFE dressing, characterized in that, include: The waterproof membrane layer consists of two layers of PTFE membrane; The first hydrogel layer is disposed between the two PTFE membranes and is used to absorb water vapor that enters between the two PTFE membranes; The second hydrogel layer is disposed on one side of the waterproof membrane layer to absorb wound exudate; as well as, A dressing layer, disposed on the second hydrogel layer, is used to promote wound healing.
2. The PTFE dressing according to claim 1, characterized in that, The first hydrogel comprises polyvinyl alcohol.
3. The PTFE dressing of claim 1, wherein, The PTFE dressing also includes a color-developing layer, which is disposed within the first hydrogel layer and is used to detect the water vapor content within the first hydrogel layer.
4. The PTFE dressing according to claim 3, characterized in that, The colorimetric layer includes urine coloring gel.
5. The PTFE dressing according to claim 1, characterized in that, The second hydrogel layer comprises chitosan hydrogel and salicylic acid loaded in the chitosan hydrogel.
6. The PTFE dressing according to claim 1, characterized in that, The dressing layer includes a matrix layer and an elastic layer. The matrix layer is disposed on the second hydrogel layer, and the elastic layer is disposed on the side of the matrix layer away from the second hydrogel layer, wherein the elastic layer is used to provide elasticity.
7. The PTFE dressing according to claim 6, characterized in that, The elastic layer is made of spandex fiber.
8. The PTFE dressing according to claim 6, characterized in that, The substrate layer is made of pure cotton fiber.