A color-changing visible wound dressing

Abstract

The present invention provides a color-changing and visible wound dressing, which is a flat structure, and its longitudinal cross-sectional structure comprises at least four layers from outside to inside, namely: an exogenous color-changing layer, a transparent layer, an endogenous color-changing layer, and a dressing inner layer; the wound dressing is particularly suitable for postoperative wounds after lumbar drainage surgery, can more intuitively reflect the wound contamination situation, and early discover the source of wound dressing contaminants (cerebrospinal fluid, urine, sweat, etc.), so that the patient's family members or nurses can discover and deal with them in time; reduce the risk of intracranial infection, and greatly reduce the risk of complications of patients.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, in particular to a color-changing visible wound dressing. Background Art

[0002] Lumbar cerebrospinal fluid drainage (LCFD) refers to a closed, sterile technique that continuously drains cerebrospinal fluid from the lumbar cistern in the subarachnoid space to the outside of the body. Lumbar drainage is widely used in the field of neurosurgery. Its advantages are minimally invasive, closed, stable pressure, and sufficient cerebrospinal fluid drainage. It can better control the cerebrospinal fluid drainage speed, slowly reduce intracranial pressure, relieve cerebral vasospasm, reduce meningeal irritation signs, and prevent the occurrence of hydrocephalus. However, postoperative complications still include low intracranial pressure, pneumocephalus, obstructed drainage tube, intracranial infection, intracranial hemorrhage, and cerebrospinal fluid leakage at the puncture point. The cause of intracranial infection is related to the failure to disinfect the puncture point in time and replace the sterile dressing. At present, the lumbar cistern external drainage tube is mostly fixed with a 9*10cm sterile self-adhesive dressing on the skin of the waist. Because the height of the drainage tube needs to be adjusted after catheterization to avoid excessive drainage and poor drainage, patients need to stay in bed. Among these patients, there are female patients and some family members who do not provide adequate care. When patients urinate in a supine position with a bedpan, it is easy for urine to flow back along the gluteal cleft to the patient's waist and contaminate the dressing. If it is not replaced in time, it can easily lead to intracranial infection. How to detect dressing contamination as soon as possible has become a problem faced by medical staff in clinical work.

[0003] According to incomplete statistics, there are more than 2,400 kinds of wound dressings on the market. The ideal dressings that are currently being studied have the following functions: ① Keep the wound at a constant temperature (37°C); ② The contact surface between the dressing and the wound needs to maintain a certain humidity; ③ Absorb excess exudate; ④ Have good permeability; ⑤ Prevent microorganisms, harmful particles and other harmful substances from contaminating the wound; ⑥ Remove the dressing without damaging the wound. Existing dressing design technology considers adsorption, comfort, etc., but in some cases, it is particularly important to remind nurses to discover and replace them in time. At present, the judgment of the moisture and source of contaminants in the dressing is still achieved by more professional medical staff, and there is also subjective feeling, which often leads to delayed discovery and easily leads to intracranial infection. Summary of the invention

[0004] The technical purpose of the present invention is to overcome the above-mentioned defects and provide a wound dressing that can more intuitively reflect the wound contamination situation, detect the source of wound dressing contaminants (cerebrospinal fluid, urine, sweat, etc.) early, and enable the patient's family members and nurses to discover and deal with the wound in time.

[0005] In order to achieve the above technical objectives, the present invention provides a color-changing and visible wound dressing, which is a flat structure, and its longitudinal cross-sectional structure includes at least four layers from the outside to the inside, namely: an exogenous color-changing layer, a transparent layer, an endogenous color-changing layer, and an inner layer of a dressing; the transverse shape of the exogenous color-changing layer is a polygon with a hollow middle; the transverse shape of the transparent layer is a polygon with the same size as the exogenous color-changing layer but convex in the middle, and the convex part in the middle is tightly fitted with the hollow part in the middle of the exogenous color-changing layer; the transverse shape of the endogenous color-changing layer is a polygon with a convex middle and a slightly smaller size than the exogenous color-changing layer; the transverse shape of the inner layer of the dressing is a polygon with the same size as the convex part in the middle of the endogenous color-changing layer.

[0006] The exogenous color-changing layer and the endogenous color-changing layer contain substances that can change color when exposed to liquid; the transparent layer is made of a material that is transparent and visible but can block liquid penetration; and the inner layer of the dressing contains therapeutic drugs.

[0007] According to a preferred implementation method of the present invention, the transparent layer of the color-changing visible wound dressing of the present invention may include two layers, namely a transparent observation layer and a transparent isolation layer; wherein the lateral shape of the transparent observation layer is a polygon of the same size as the color-changing layer of the foreign substance but convex in the middle, wherein the convex part in the middle is closely fitted with the hollowed-out part in the middle of the color-changing layer of the foreign substance; and the lateral shape of the transparent isolation layer is a polygon of the same size as the color-changing layer of the foreign substance. The transparent layer is divided into two layers, which can reduce costs, and can better isolate internal and external source pollutants so that they will not overlap at all, and also facilitate better clinical observation of the source of the pollutants for timely treatment.

[0008] The color-changing visible wound dressing of the present invention can be adjusted in size and dimensions as required. It is generally a quadrilateral shape, but can also be designed into special shapes such as polygons according to the location, size, and shape of different wounds.

[0009] Furthermore, the inner layer of the dressing is a self-adhesive structure. The wound dressing is sterilely packaged after disinfection and sterilization. When used, the package is opened, the adhesive tape of the inner layer of the self-adhesive dressing is torn off, and it is applied to the patient's wound. At this time, the exogenous color-changing layer (polygonal outer frame) and the transparent layer (polygonal middle) can be directly observed from the outside, and the endogenous color-changing layer inside can be observed through the transparent layer. Because the exogenous color-changing layer and the endogenous color-changing layer contain substances that can change color when encountering liquid, if there is liquid (such as tissue fluid or blood, etc.) oozing out of the patient's wound, the endogenous color-changing layer will change color, so that the patient's family or nurse can find and deal with it in time; if the patient's wound is contaminated by liquid (such as cerebrospinal fluid, urine, sweat, etc.) outside, the exogenous color-changing layer will also change color, and the patient's family or nurse can also find and deal with it in time; greatly reducing the risk of complications in patients.

[0010] The substance that can change color when encountering liquid contained in the exogenous color-changing layer and the endogenous color-changing layer can be a single chemical substance, such as anhydrous copper sulfate, which will turn blue when encountering water; it can also be various acid-base indicators, which can change color to indicate according to the pH value of the liquid encountered. The acid-base indicators that can be used include: methyl red (color change range pH 4.4-6.2 color change: red-yellow), bromothymol blue (color change range pH 6.2-7.6 color change: yellow-blue), neutral red (color change range pH6.8-8.0 color change: red-yellow orange), phenol red (color change range pH 6.7-8.4 color change: yellow-red), etc. The choice of acid-base indicator can be selected according to the pH value of the liquid, such as urine and sweat are generally acidic, with a urine pH of 4.5-6.5 and a sweat pH of 4.5-5.5; cerebrospinal fluid and blood are weakly alkaline, with a cerebrospinal fluid pH of 7.25-7.42 and a blood pH of 7.35-7.45. Exogenous substances are generally acidic substances such as urine and sweat; endogenous substances are generally weakly alkaline substances such as blood and tissue fluid. Acid-base indicators with different color changes are selected so that the exogenous color-changing layer and the endogenous color-changing layer show different colors after color change, especially colors with obvious contrast, such as one red and one blue, which makes it easier to observe and warn in time. When in use, the above-mentioned acid-base indicator or anhydrous copper sulfate and other substances are attached to the carrier material to form the exogenous color-changing layer and the endogenous color-changing layer. The carrier material can be non-woven fabrics, oxidized regenerated cellulose, etc.

[0011] The substances that can change color when encountering liquid contained in the exogenous color-changing layer and the endogenous color-changing layer can also be color-changing substances with physical properties, such as water-soluble starch paper, water-soluble regenerated cellulose or water-soluble vinylon, which are opaque and white under normal conditions. After encountering liquid solutions such as water, they can be dissolved in the liquid and become colorless and transparent. They can also remind patients' families or nurses to discover and deal with them in time.

[0012] The transparent layer is made of a transparent material that is visible but can block liquid penetration, such as a TPU film, a PTFE film, an ePTFE film, and a polysiloxane film. It can isolate the pollution of endogenous and exogenous substances, which is more conducive to determining the source of the pollutants and dealing with them in time.

[0013] The color-changing visible wound dressing of the present invention is particularly suitable for postoperative wounds after lumbar drainage surgery. It can more intuitively reflect the wound contamination situation and early discover the source of wound dressing contaminants (cerebrospinal fluid, urine, sweat, etc.), so that the patient's family members or nurses can discover and deal with them in time; it reduces the risk of intracranial infection and greatly reduces the risk of complications in patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a front view of the wound dressing of Example 1;

[0015] Figure 2 is a side view of the wound dressing of Example 1;

[0016] Figure 3 is a rear view of the wound dressing of Example 1;

[0017] Figure 4 for Figure 3 AA section view in;

[0018] Figure 5 is a front view of the wound dressing of Example 2;

[0019] Figure 6 is a side view of the wound dressing of Example 2;

[0020] Figure 7 is a rear view of the wound dressing of Example 2;

[0021] Figure 8 for Figure 7 AA section view in. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described below with reference to the accompanying drawings. Elements and features described in one drawing or one embodiment of the present invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that for the purpose of clarity, the representation and description of components or processes that are not related to the present invention and are known to those of ordinary skill in the art are omitted in the drawings and descriptions.

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Example 1

[0025] like Figure 1-4As shown, the present embodiment provides a color-changing and visible dressing, which is a flat structure, and its longitudinal cross-sectional structure includes four layers from outside to inside, namely: an exogenous color-changing layer 1, a transparent layer 2, an endogenous color-changing layer 3, and a dressing inner layer 4; the transverse shape of the exogenous color-changing layer 1 is a quadrilateral with a hollow middle; the transverse shape of the transparent layer 2 is a quadrilateral with the same size as the exogenous color-changing layer 1 but convex in the middle, and the convex part in the middle of the transparent layer 2 is tightly fitted with the hollow part in the middle of the exogenous color-changing layer 1; the transverse shape of the endogenous color-changing layer 3 is a quadrilateral slightly smaller than the exogenous color-changing layer 1 and convex in the middle; the transverse shape of the dressing inner layer 4 is a quadrilateral with the same size as the convex part in the middle of the endogenous color-changing layer 3.

[0026] The exogenous color-changing layer 1 and the endogenous color-changing layer 3 contain substances that can change color when exposed to liquid; the transparent layer 2 is a transparent material that is visible but can block liquid penetration; it is used for observation and can isolate the liquid exchange between layer 1 and layer 3, but does not affect the air permeability of the affected area. The inner layer 4 of the dressing contains therapeutic drugs, which are in direct contact with the affected area and play a therapeutic role.

[0027] In this embodiment, the substance that can change color when encountering liquid contained in the exogenous color-changing layer 1 and the endogenous color-changing layer 3 is anhydrous copper sulfate, which will turn blue when encountering water, which can be observed in time and serve as a warning. In this embodiment, the substance that can change color when encountering liquid contained in the exogenous color-changing layer 1 and the endogenous color-changing layer 3 can also be water-soluble vinylon, which is opaque and white under normal conditions, and will dissolve in the liquid and become colorless and transparent after encountering liquid solutions such as water, which can also remind the patient's family or nurses to discover and deal with it in time.

[0028] The transparent layer 2 is made of a polysiloxane film, which is transparent and visible and can isolate the pollution of endogenous and exogenous substances, which is more conducive to determining the source of the pollutants and handling them in time.

[0029] The inner layer 4 of the dressing is a self-adhesive structure. The wound dressing is sterilely packaged after disinfection and sterilization. When used, the package is opened, the adhesive tape of the inner layer of the self-adhesive dressing is torn off, and it is applied to the patient's wound. At this time, the exogenous color-changing layer 1 (the outer frame of the quadrilateral) and the transparent layer 2 (the middle of the quadrilateral) can be directly observed from the outside, and the endogenous color-changing layer 3 inside can be observed through the transparent layer 2. Because the exogenous color-changing layer 1 and the endogenous color-changing layer 3 contain substances that can change color when encountering liquid, if there is liquid (such as tissue fluid or blood, etc.) oozing out of the patient's wound, the endogenous color-changing layer 3 will change color, so that the patient's family or nurse can find and deal with it in time; if the patient's wound is contaminated by liquid (such as cerebrospinal fluid, urine, sweat, etc.) outside, the exogenous color-changing layer 1 will also change color, which can also enable the patient's family or nurse to find and deal with it in time; greatly reducing the risk of complications in patients.

[0030] Example 2

[0031] like Figure 5-8 As shown, the present embodiment provides a color-changing and visible dressing, which is a flat structure, and its longitudinal cross-sectional structure includes five layers from the outside to the inside, namely: an exogenous color-changing layer 1, a transparent observation layer 21, a transparent isolation layer 22, an endogenous color-changing layer 3, and a dressing inner layer 4; the transverse shape of the exogenous color-changing layer 1 is a quadrilateral with a hollow middle; the transverse shape of the transparent observation layer 21 is a quadrilateral with the same size as the exogenous color-changing layer 1 but convex in the middle, and the convex part in the middle of the transparent observation layer 21 is tightly fitted with the hollow part in the middle of the exogenous color-changing layer 1; the transverse shape of the transparent isolation layer 22 is a quadrilateral with the same size as the exogenous color-changing layer 1; the transverse shape of the endogenous color-changing layer 3 is a quadrilateral slightly smaller than the exogenous color-changing layer 1 and convex in the middle; the transverse shape of the dressing inner layer 4 is a quadrilateral with the same size as the convex part in the middle of the endogenous color-changing layer 3.

[0032] The exogenous color-changing layer 1 and the endogenous color-changing layer 3 contain substances that can change color when exposed to liquid; the transparent observation layer 21 and the transparent isolation layer 22 are transparent and visible but can isolate liquid penetration; the transparent observation layer 21 is used for observation, and the transparent isolation layer 22 is used to isolate the liquid exchange between the 1st layer and the 3rd layer, but does not affect the air permeability of the affected part. The transparent layer 2 adopts a two-layer design, which can save costs and increase the isolation effect. Because of the two-layer structure, materials with weaker liquid isolation effect and lower cost can be selected in the material selection, such as TPU film, which can achieve the same effect. The inner layer 4 of the dressing contains therapeutic drugs, which are in direct contact with the affected part and play a therapeutic role.

[0033] In this embodiment, the substances that can change color when encountering liquids contained in the exogenous color-changing layer 1 and the endogenous color-changing layer 3 are acid-base indicators, which can change color according to the pH value of the liquid encountered to provide a prompt. The exogenous color-changing layer 1 contains methyl red, which will change color to red after encountering exogenous acidic substances (such as urine, sweat, etc.); the endogenous color-changing layer 3 contains bromothymol blue, which will change color to blue after encountering endogenous weak alkaline substances (such as blood, tissue fluid, etc.). It is easier to observe and warn in time.

[0034] When in use, the acid-base indicator is attached to the carrier material to form the exogenous color-changing layer and the endogenous color-changing layer. The carrier material can be non-woven fabric, oxidized regenerated cellulose, etc.

[0035] The inner layer 4 of the dressing is a self-adhesive structure. The wound dressing is sterilely packaged after disinfection and sterilization. When used, the package is opened, the adhesive tape of the inner layer of the self-adhesive dressing is torn off, and it is applied to the patient's wound. At this time, the exogenous color-changing layer 1 (the outer frame of the quadrilateral) and the transparent observation layer 21 (the middle of the quadrilateral) can be directly observed from the outside, and the endogenous color-changing layer 3 inside can be observed through the transparent observation layer 21 and the transparent isolation layer 22. Because the exogenous color-changing layer 1 and the endogenous color-changing layer 3 contain substances that can change color when encountering liquid, if the patient's wound has liquid (such as tissue fluid or blood, etc.) oozing out, the endogenous color-changing layer 3 will change color, so that the patient's family or nurse can find and deal with it in time; if the patient's wound is contaminated by liquid (such as cerebrospinal fluid, urine, sweat, etc.) outside, the exogenous color-changing layer 1 will also change color, which can also enable the patient's family or nurse to find and deal with it in time; greatly reducing the risk of complications in patients.

[0036] Although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions and conversions can be made without exceeding the spirit and scope of the present invention defined by the appended claims. Moreover, the scope of the present application is not limited to the specific embodiments of the process, equipment, means, method and steps described in the specification. It will be easily understood by those of ordinary skill in the art from the disclosure of the present invention that the process, equipment, means, method or step to be developed in the present and future can be used to perform the functions substantially the same as the corresponding embodiments described herein or to obtain the results substantially the same as the corresponding embodiments described herein. Therefore, the appended claims are intended to include such processes, equipment, means, methods or steps within their scope.

Claims

1. A color-changing visible wound dressing, characterized in that: The dressing is a flat structure, and its longitudinal cross-sectional structure includes at least four layers from the outside to the inside, namely: an exogenous color-changing layer (1), a transparent layer (2), an endogenous color-changing layer (3), and a dressing inner layer (4); the transverse shape of the exogenous color-changing layer (1) is a polygon with a hollow center; the transverse shape of the endogenous color-changing layer (3) is a polygon slightly smaller than the exogenous color-changing layer (1) and convex in the middle; the transverse shape of the dressing inner layer (4) is a polygon with the same size as the convex part in the middle of the endogenous color-changing layer (3); the exogenous color-changing layer (1) and the endogenous color-changing layer (3) are ) contains a substance that changes color when it encounters liquid; the transparent layer (2) is made of a material that is transparent and visible but can prevent liquid penetration; the dressing inner layer (4) contains therapeutic drugs; the transparent layer (2) includes two layers, namely a transparent observation layer (21) and a transparent isolation layer (22); the lateral shape of the transparent observation layer (21) is a polygon that is the same size as the foreign matter color-changing layer (1) but convex in the middle, and the convex part in the middle is tightly fitted with the hollow part in the middle of the foreign matter color-changing layer (1); the lateral shape of the transparent isolation layer (22) is a polygon that is the same size as the foreign matter color-changing layer (1).

2. The color-changing visible wound dressing according to claim 1, characterized in that: The substance that changes color when in contact with liquid is anhydrous copper sulfate.

3. The color-changing visible wound dressing according to claim 1, characterized in that: The substance that changes color when encountering liquid is an acid-base indicator.

4. The color-changing visible wound dressing according to claim 1, characterized in that: The material that can change color when in contact with liquid is water-soluble starch paper, water-soluble regenerated cellulose or water-soluble vinylon.

5. The color-changing visible wound dressing according to claim 1, characterized in that: The material of the transparent layer (2) is one of a TPU film, a PTFE film, an ePTFE film and a polysiloxane film.

6. The color-changing visible wound dressing according to claim 1, characterized in that: The polygon is a quadrilateral.

7. The color-changing visible wound dressing according to any one of claims 1 to 6, characterized in that: The inner layer (4) of the dressing is a self-adhesive structure.

8. The color-changing visible wound dressing according to claim 7, characterized in that: The dressing is sterilized and then packaged aseptically.

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