Wound dressing and preparation method thereof

Abstract

The invention discloses a wound dressing and a preparation method thereof, and relates to the technical field of dressings, according to the wound dressing prepared through the method, when elastic base cloth is in a stretched state, gel fibers are implanted into the elastic base cloth in a needling mode, stretching is relieved after needling is completed, the elastic base cloth recovers to the state before stretching, the distance between original needling points is reduced accordingly, and the wound dressing is obtained. Therefore, compared with a conventional wound dressing which is compounded with conventional base cloth through direct needling, the wound dressing has the advantages that the gel fibers are implanted into the elastic base cloth after the elastic base cloth is stretched, and the wound dressing can have higher gel fiber implantation density after stretching is relieved, so that the wound dressing has good moisture absorption performance; meanwhile, compared with a conventional mode of increasing the implantation density of the gel fiber (such as increasing the needling frequency), the fiber damage is obviously reduced, and the manufacturing cost is controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of dressings, and particularly relates to a wound dressing and a preparation method thereof. Background Art

[0002] Wet dressings have been proven to be suitable for assisting in the healing of chronic wounds. They can maintain local wound moisture after absorbing exudate, thereby maintaining the hydration of damaged tissues and accelerating wound healing. Gel fibers have significant advantages in wet dressings. However, when single gel fibers are applied to wounds, after absorbing exudate, they become gel-like with very low wet strength and are prone to form residues on the wounds, which is not conducive to the operation during wound dressing change.

[0003] Based on the aforementioned known situation, one research and development idea of the researchers is to composite gel fibers on a base cloth, and drive the overall removal of the gel fibers by means of the integrity of the base cloth to avoid forming residues when removing the dressing. For example, conventionally, gel fibers are composited on the base cloth by means of chemical bonding, electrospinning or direct needling.

[0004] However, when compositing by means of chemical bonding, there are problems of insufficient initial adhesion and poor long-term adhesion stability, and finally degumming occurs. Moreover, problems such as reduced air permeability and decreased hygroscopicity will also occur, which have a negative impact on wound healing; when gel fibers are composited on the base cloth by electrospinning, the composite strength and hygroscopic performance are limited and cannot meet clinical requirements; by direct needling, in order to effectively composite on the base cloth and improve hygroscopicity, the conventional method of increasing the needling frequency is prone to cause obvious fiber damage or loss, resulting in raw material loss.

[0005] There is still room for improvement in the prior art. Summary of the Invention

[0006] The main object of the present invention is to propose a wound dressing, providing an improved solution in which gel fibers are composited on an elastic base cloth in a stretched state by physical needling means. It is not only effectively composited on the base cloth, improves the unit hygroscopic performance, but also is conducive to reducing fiber damage or loss of gel fibers.

[0007] Another object of the present invention is to propose a preparation method for preparing the aforementioned wound dressing.

[0008] To achieve the above object, the present invention proposes a wound dressing, including an elastic base cloth with stretch elasticity, and gel fibers implanted thereon by needling in a stretched state of the elastic base cloth. It is easy to understand that the gel fibers are located on the side close to the wound contact side to keep the local wound moist after absorbing exudate.

[0009] Gel fibers generally have relatively low strength or poor elasticity. When such fibers are directly implanted onto the base fabric by needling, generally speaking, the higher the needling frequency, the higher the fiber implantation density, and vice versa. However, some technical problems may occur during the needling process. If the needling density (needling frequency) is too high, a lot of fiber damage will be caused, and the damaged fibers will become short fibers and be lost, resulting in unnecessary waste. If the needling density (needling frequency) is too low, the strength of the gel fibers attached to the bottom will be very low, and the gel fibers will fall off from the elastic bottom during the use of the dressing.

[0010] For the wound dressing prepared by the present invention, when the elastic base fabric is in a stretched state, the gel fibers are implanted into the elastic base fabric by needling. After the needling is completed, the stretching is released, and the elastic base fabric returns to its state before stretching, and the distance between the original needling points decreases accordingly, so that the gel fiber implantation density increases equivalently. Therefore, compared with the wound dressing of the conventional direct needling composite conventional base fabric, by stretching the elastic base fabric and then implanting the gel fibers thereon, the wound dressing can have a higher gel fiber implantation density after the stretching is released, and thus has good moisture absorption performance. At the same time, compared with the conventional method of increasing the gel fiber implantation density (such as increasing the needling frequency), the fiber damage is significantly reduced, and the manufacturing cost is controlled. The wet strength of this kind of wound dressing after absorbing exudate is also relatively ideal.

[0011] The gel fibers are implanted on the elastic base fabric. Therefore, the "base" in the elastic base fabric is a positional relationship relative to the gel fibers. The elastic base fabric can also be in a relatively central position in the entire wound dressing, which is not limited here. Preferably, the wound dressing of the present invention is composed of an elastic base fabric with stretch elasticity and gel fibers implanted thereon by needling in a stretched state of the elastic base fabric.

[0012] The elastic base fabric is made of a fabric with stretch elasticity or uses fibers with stretch elasticity as the silk raw material during weaving. Preferably, the elastic base fabric is one of elastic knitted fabric, elastic woven fabric or elastic non-woven fabric, or preferably, the silk raw material used in the elastic base fabric during weaving includes at least one of spandex stretch filament, polyester stretch filament, nylon stretch filament and polypropylene stretch filament.

[0013] Since the gel fibers are in direct contact with the wound, fibers preferably having good moisture absorption performance and the performance of becoming a gel after moisture absorption are preferred, so as to have better moisture retention performance. Preferably, the gel fibers are at least one of alginate fibers and their derivatives, cellulose fibers and their derivatives, chitosan fibers and their derivatives, polyvinyl alcohol fibers and their derivatives, and protein fibers and their derivatives. The gel fibers used in the examples of the present invention are carboxymethyl cellulose fibers, alginate fibers and acylated chitosan fibers. Other common gel fibers are carboxyethyl cellulose fibers, carboxymethyl chitosan fibers, soluble vinyon fibers, etc.

[0014] In order to enable the wound dressing to have better moisture absorption performance, preferably, the free absorption performance of the gel fiber is at least 500%.

[0015] Preferably, the grammage of the elastic base cloth is 20–300 gsm. gsm is the abbreviation of grams per square meter.

[0016] Preferably, the thickness of the elastic base cloth is 0.3–3.0 mm. The thickness refers to the vertical distance between the upper and lower surfaces of the elastic base cloth under a certain pressure.

[0017] Generally, the ultimate stretching multiple of the elastic base cloth selected is 1.2 - 2.0. The ultimate stretching multiple refers to the stretching multiple required to stretch the fabric until it breaks.

[0018] The present invention also provides a preparation method of a wound dressing, including the following steps:

[0019] S1: Stretch the elastic base cloth according to a preset stretching multiple;

[0020] S2: Lay the gel fiber on the stretched elastic base cloth;

[0021] S3: Pierce the gel fiber from the surface side to the other side of the elastic base cloth with a needle so that the gel fiber is implanted into the elastic base cloth;

[0022] S4: Release the stretched state and prepare the fabric obtained in step S3 into a wound dressing.

[0023] Specifically but not limitedly, in step S4, a working process of preparing the fabric obtained in step S3 into a wound dressing is: passing the above fabric through slitting, compounding, packaging, and sterilization to prepare a wound dressing.

[0024] Specifically, the stretching in step S1 can be to stretch the elastic base cloth horizontally, vertically, or simultaneously in the horizontal and vertical directions, preferably vertically.

[0025] Specifically, stretch the elastic base cloth with a stretching device or mechanism capable of stretching the fabric to improve efficiency. The stretching device or mechanism can meet the stretching requirements of the elastic base cloth during the production of the dressing.

[0026] Preferably, in step S1, the stretching multiple of the elastic base cloth is 1.2–2.0. Further preferably, the stretching multiple of the elastic base cloth is 1.2–1.6.

[0027] The elastic base cloth with a draw ratio of 1.2 to 2.0 has practical application significance for the wound dressing of the present invention. In the present invention, the density of the implanted fibers is mainly adjusted by adjusting the draw ratio of the elastic base cloth, while reducing fiber damage. The draw ratio of the elastic base cloth is adapted to the ultimate draw ratio of the elastic base cloth to avoid excessive damage to the stretch elasticity of the elastic base cloth caused by overstretching. Further preferably, a draw ratio of 1.2 to 1.6 is not only beneficial to obtaining good hygroscopicity, but also minimizes fiber loss.

[0028] In order to prevent the gel fibers from falling off the elastic base cloth during the use and removal of the wound dressing, in step S3, the needling density is not less than 25 needles per square centimeter, but generally does not exceed 250 needles per square centimeter. Brief Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a physical diagram (gel fiber surface) of Embodiment 5 of the present invention;

[0031] Figure 2 It is a schematic cross-sectional view of the wound dressing of the present invention changing with the preparation steps.

[0032] In the drawings: 1 - elastic base cloth, 2 - gel fiber.

[0033] The realization of the purpose of the present application, functional features and advantages will be further described in conjunction with the embodiments and with reference to the drawings. Detailed Embodiments

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions appears to be mutually contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The test methods for the ultimate tensile multiple, thickness, free absorption performance, and net gram weight of gel fibers of the dressing samples involved in the specific implementation manner of this application are as follows:

[0036] 1. The test method for the ultimate tensile multiple described in the present invention is as follows: (Method reference: ISO 9073-3:1989 Textiles-Test methods for nonwovens-Part 3:Determination of tensile strength and elongation)

[0037] 1) Take out the sample dressing and lay it flat. Use a steel ruler to measure and cut out two adjacent side lengths of the dressing with a width of 20 mm ± 0.5 mm. The edges of the cut long strip specimens are smooth without obvious notches.

[0038] 2) Place the specimen between the two clamping distances of a universal testing machine. The gauge length is 50 mm, denoted as (L0); align the long axis of the specimen with the center line connecting the upper and lower clamps, and lock the clamps to prevent the specimen from slipping or breaking within the clamps. Tensile the sample at a test speed of 100 mm / min until it breaks, and record the length, denoted as (L1).

[0039] 3) The ultimate tensile multiple is denoted as N: N = L1 / L0.

[0040] 2. The test method for the dressing thickness described in the present invention is as follows: (Method reference: GB / T 3819-1997-Determination of the thickness of textiles and textile products)

[0041] 1) Specimen treatment: During the test, the measurement positions should be evenly arranged in a stepped shape in the area more than 150 mm away from the cloth edge. Each measurement point is not in the same longitudinal and transverse positions, and defects and wrinkles that affect the test results should be avoided.

[0042] 2) By adjusting the knob at the bottom of the instrument, make the pointer of the instrument panel point to the "0" position and adjust it until the pressure foot fits.

[0043] 3) Lift the pressure foot and lay the specimen flat on the reference plate without tension and deformation.

[0044] 4) Gently place the pressure foot on the specimen and maintain a constant pressure until the pointer stabilizes, then read the thickness indication value. Repeat the experiment 5 times and take the average value.

[0045] 3. The test method for the free absorption performance of gel fibers in the needle-punched fabric of the present invention is as follows (the method refers to EN13726-2023-Test methods for wound dressings-Aspects of absorption, moisture vapour transmission, waterproofness and extensibility-Annex B Freeswell absorptive capacity)

[0046] 1) Cut the dressing (including the backing cloth) into 5 cm × 5 cm, weigh the gram weight of each sample, denoted as W1; the cutting and weighing method of the elastic backing cloth or non-elastic backing cloth (hereinafter referred to as the backing cloth) is the same as above, denoted as W2.

[0047] 2) Set the temperature of the constant temperature incubator to 37 °C and preheat it with Solution A.

[0048] 3) Solution A is composed of sodium chloride and calcium chloride solution. The preparation method is as follows: Dissolve 8.289 g of sodium chloride and 0.368 g of calcium chloride dihydrate in purified water and make up to 1 L volumetric flask.

[0049] 4) Place the perforated plate with support (SPP) into the petri dish, add enough preheated test solution A and place it in a 37 °C constant temperature oven.

[0050] 5) Place the dressing (W1) and the backing cloth (W2) into Solution A with SPP respectively, put the petri dish back into the constant temperature oven and keep it for (30 ± 1) min to ensure that the dressing is still completely immersed in Solution A.

[0051] 6) Take out the dressing and the backing cloth from Solution A, drain the liquid and weigh them accurately to 0.01 g. The dressing is denoted as W3 and the backing cloth is denoted as W4.

[0052] 7) Absorption capacity of dressing (g / cm 2 ) = [wet weight of dressing (W3) - dry weight of dressing (W1)] ÷ sample area (cm 2 ) × 100;

[0053] Absorption capacity of backing cloth (g / cm 2 ) = [wet weight of backing cloth (W4) - dry weight of backing cloth (W2)] ÷ sample area (cm 2 ) × 100;

[0054] Absorption capacity of gel fiber layer = Absorption capacity of dressing - Absorption capacity of backing cloth. Repeat the experiment 5 times using this test method.

[0055] 4. The weighing method for the net gram weight of the gel fiber in the needled fabric of the present invention is specifically as follows:

[0056] 1) Area selection: Randomly select 5 areas on the dressing, and each area is 100 cm 2 ;

[0057] 2) Total gram weight weighing: Randomly weigh the gram weights of the dressings in 5 areas using an electronic balance and calculate their average value, denoted as m1;

[0058] 3) Base cloth gram weight weighing: Take a pure base cloth (without gel fiber) of the same area (100 cm 2 ) and weigh its gram weight, denoted as m2;

[0059] 4) Net gram weight calculation: Under the same area, the net gram weight (m3) = total gram weight (m1) - base cloth gram weight (m2).

[0060] 5. The conversion formula of the needling density, main machine frequency, and bottom curtain speed (needling input speed) of the present invention:

[0061] 1) The needling density D (needles per square meter) = main machine frequency f (times per minute) / bottom curtain speed v (meters per minute) × needle plate density w (needles per meter).

[0062] 2) The needle plate density of the needling machine is 4000 needles per meter;

[0063] 3) The needling density d (needles per square centimeter) = 1 / 10000 × D (needles per square meter)

[0064] The technical solution of the present application will be further described in detail through specific examples or comparative examples below.

[0065] Comparative Example 1

[0066] Prepare a dressing sample, and the specific production process is as follows:

[0067] 1) Select 2 kg of alginate fiber as the gel fiber;

[0068] 2) After the gel fiber is put into the needled non-woven fabric machine, the gel fiber is loosened, carded, and laid into a web in sequence;

[0069] 3) Before the needling stage, lay the base cloth flat and without tension on the bottom layer, lay the loosened alginate fiber on the upper layer, and send it into the needling machine for processing.

[0070] 4) Main parameters of the base cloth: Structure: elastic shuttle fabric, gram weight 160 gsm, ultimate tensile multiple 1.7, thickness 1.2 mm.

[0071] 5) Set the discharge speed / feeding speed ratio of the needling machine 1 = 1.01 (i.e., the input and output speeds of the needling machine are basically the same), the bottom curtain speed of the cross-lapper is 1.27 m / min, and the frequency of the main needling machine is 269 times / min.

[0072] 6) Collect the dressing samples and weigh their gram weights.

[0073] In the dressing samples obtained by the above method, the average net gram weight of the gel fibers was measured to be 149 gsm.

[0074] Comparative Example 2

[0075] Prepare dressing samples, with other parameters remaining the same as in Comparative Example 1. The difference lies in that: the frequency of the main needling machine in step 5) is 398 times / min, that is, the needling frequency is nearly 50% higher than that in Comparative Example 1.

[0076] In the dressing samples obtained by the above method, the average net gram weight of the gel fibers was measured to be 144 gsm.

[0077] Under the same conditions, Comparative Example 2 used a higher needling frequency, that is, increased the needling density, resulting in greater damage to the gel fibers. The damaged fibers became short fibers and were lost as flying fluff during the needling process, resulting in the gram weight of the gel fibers after the final needle punching composite being reduced by nearly 5 g / m² compared to Comparative Example 1, a reduction of nearly 3.5% (i.e., the fiber loss rate). This shows that the gel fibers are very easy to be damaged and become short fibers and flow away, which will lead to increased costs and decreased moisture absorption performance. Directly increasing the needling density also increases the loss of short fibers, that is, aggravates the fiber damage situation.

[0078] Comparative Example 3

[0079] Other parameters remain the same as in Comparative Example 1. The difference lies in that: the bottom curtain speed of the cross-lapper in step 5) is 0.83 m / min, that is, the bottom curtain speed of the cross-lapper is 0.44 m / min (nearly 34.6%) slower than that in Example 1. The output fiber speed of the carding machine is constant. When the bottom curtain speed of the cross-lapper is slower, the gel fibers laid on the bottom cloth will increase proportionally.

[0080] In the dressing samples obtained by the above method, the average net gram weight of the gel fibers was measured to be 217 gsm.

[0081] Under the same conditions, in Comparative Example 3, a slower bottom curtain speed was used, that is, more gel fibers were laid on the bottom cloth. Therefore, theoretically, the gram weight of the composite fabric should be larger, that is, it should be 149 (Comparative Example 1) × 1.27 / 0.83 = 228 gsm. However, in fact, only 217 gsm was measured. The actual value was nearly 11 gsm less than the theoretical value (the fiber loss rate was 4.8%, and this fiber loss rate was the percentage of the loss generated by comparing the actual value with the theoretical value). That is, increasing the feeding amount of gel fibers during the needle punching composite production process can increase the gram weight of gel fibers in the composite dressing. However, because the fiber layer is thicker, more fiber damage and loss occur during the needle punching process, and the gram weight of gel fibers in the composite dressing will not increase in proportion. Therefore, although the method of increasing the feeding amount of the fiber layer can also increase the number of gel fibers in the dressing, this will inevitably cause a large loss of gel fibers, bringing unnecessary waste to such production. The method of the present invention can increase the gram weight of gel fibers in the dressing while significantly reducing additional losses.

[0082] Example 1

[0083] Other parameters were kept the same as those in Comparative Example 1, except that in step 3), a pre-tension was applied to the bottom cloth to stretch it by about 20% (stretching multiple 1.2).

[0084] In the dressing sample obtained by the above method, the net gram weight of gel fibers was measured to be 177 gsm.

[0085] By stretching the elastic bottom cloth, it is equivalent to further expanding the specific surface area of the bottom cloth, laying gel fibers corresponding to the specific surface area. Theoretically, after releasing the stretch, the implant fiber density should increase by an amount equivalent to the stretching multiple. The bottom cloth after stretching in Example 1 carried about 18.8% more gel fibers than the non-stretched bottom cloth (Comparative Example 1), and the additional fiber carrying capacity was basically equivalent to the stretching multiple of the bottom cloth. The fiber loss rate was about 1.2% (this fiber loss rate was: (theoretical value - actual value) / theoretical value × 100%. In Examples 1 to 4, the theoretical value was: the gram weight of gel fibers in Comparative Example 1 × the stretching multiple in each example, and the actual value was the net gram weight of gel fibers actually measured). Compared with Comparative Examples 1 to 3, it can be seen that by using the wound dressing of the present invention, while significantly increasing the net gram weight of gel fibers, the loss of fiber raw materials is significantly reduced.

[0086] Example 2

[0087] Other parameters were kept the same as those in Comparative Example 1, except that in step 3), a pre-tension was applied to the bottom cloth to stretch it by about 30% (stretching multiple 1.3), and then gel fibers were laid on the stretched bottom cloth for subsequent needle punching process (other process parameters were the same as those in Comparative Example 1).

[0088] In the dressing sample obtained by the above method, the net gram weight of the gel fiber was measured to be 192 gsm, and the fiber loss rate was 1.1%.

[0089] Example 3

[0090] Other parameters were kept the same as in Comparative Example 1, except that: in step 3), the pre-tension of the base cloth was such that it was stretched by about 40% (stretching multiple 1.4), and then the gel fiber was laid on the stretched base cloth for the subsequent needling process (other process parameters were the same as in Comparative Example 1).

[0091] In the dressing sample obtained by the above method, the net gram weight of the gel fiber was measured to be 207 gsm, and the fiber loss rate was 1.1%.

[0092] Example 4

[0093] Other parameters were kept the same as in Comparative Example 1, except that: in step 3), the pre-tension of the base cloth was such that it was stretched by about 55% (stretching multiple 1.55), and then the gel fiber was laid on the stretched base cloth for the subsequent needling process (other process parameters were the same as in Comparative Example 1).

[0094] In the dressing sample obtained by the above method, the gel fiber was measured to be 229 gsm, and the fiber loss rate was 1.3%.

[0095] The absorption performance of the above dressing samples was tested according to the method of BS EN 13726-2023, and the summary is as follows:

[0096]

[0097] In the specific embodiments of the present application, the data in Comparative Example 1 was used as the basic data for comparison with other comparative examples and examples to exclude systematic errors. Comparing Comparative Example 2 with Comparative Example 1, it can be seen that simply increasing the needling frequency (needling density) to increase the implantation density of the gel fiber resulted in a large loss of the gel fiber and could not achieve the purpose of reducing the fiber loss; comparing Comparative Example 3 with Comparative Example 1, it can be seen that simply slowing down the speed of the bottom curtain (i.e., feeding more gel fiber to increase the thickness of the gel fiber on the base cloth), theoretically, the gel fiber gram weight of the composite dressing should increase, however, during the experiment, it did not increase in proportion to the theoretical value, but instead significantly increased the fiber loss. It can be seen that both the conventional method of increasing the needling frequency or increasing the fiber thickness have relatively large losses. Through calculation, the fiber loss rate brought by the conventional method is about 4.0 - 9.0%.

[0098] The present application provides a method for effectively implanting gel fibers into a base fabric. By stretching an elastic base fabric and then needling the gel fibers onto it, the moisture absorption performance per unit of the wound dressing can be improved while reducing fiber damage or loss. The fiber loss rate of the present application is between 1.0% and 2.5%, which is significantly lower than that of the conventional method. The present application provides a technical solution that combines science and practicality in the application of sanitary materials. Through similar experiments, it is found that when the needling density is 25 to 250 needles per square centimeter and the stretching multiple of the elastic base fabric is 1.2 to 2.0, by needling and compounding the gel fibers of the present application onto the stretched elastic base fabric, the above-mentioned effects can be obtained. From the comparison between the specific examples 1 to 4 and the comparative example 1 above, it can be seen that by adjusting the stretching multiple of the elastic base fabric to 1.2 to 1.6, the gel fiber loading per unit area is increased, and the optimal balance between process cost and moisture absorption performance is achieved.

[0099] In the selection of gel fibers, at least one of derivatives of alginate fibers, cellulose fibers and their derivatives, chitosan fibers and their derivatives, polyvinyl alcohol fibers and their derivatives, and protein fibers and their derivatives can also be used for substitution; in the selection of elastic base fabrics, one of other elastic woven fabrics, elastic knitted fabrics or elastic non-woven fabrics can also be used for substitution.

[0100] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A wound dressing, characterized in that, It includes an elastic bottom cloth with stretch elasticity, and gel fibers implanted on the elastic bottom cloth in a needling manner in a stretched state of the elastic bottom cloth.

2. The wound dressing according to claim 1, characterized in that, The elastic bottom cloth is one of an elastic knitted fabric, an elastic woven fabric, or an elastic non-woven fabric.

3. The wound dressing according to claim 1, characterized in that, The filament raw materials used in the weaving process of the elastic bottom cloth include at least one of spandex elastic filaments, polyester elastic filaments, nylon elastic filaments, and polypropylene elastic filaments.

4. The wound dressing according to claim 1, wherein The gel fibers include at least one of alginate fibers and their derivatives, cellulose fibers and their derivatives, chitosan fibers and their derivatives, polyvinyl alcohol fibers and their derivatives, and protein fibers and their derivatives.

5. The wound dressing according to claim 1, characterized in that, The grammage of the elastic bottom cloth is 20–300 gsm.

6. The wound dressing according to claim 1, wherein, The thickness of the elastic bottom cloth is 0.3–3.0 mm.

7. The wound dressing according to claim 1, wherein, The ultimate stretching multiple of the elastic bottom cloth is 1.2 - 2.

0.

8. The preparation method of the wound dressing according to any one of claims 1 to 7, characterized in that, It includes the following steps: S1: Stretch the elastic bottom cloth according to a preset stretching multiple. S2: Lay the gel fibers on the stretched elastic bottom cloth. S3: Pierce the gel fibers from the surface side to the surface side of the elastic bottom cloth so that the gel fibers are implanted into the elastic bottom cloth. S4: Release the stretched state and prepare the fabric obtained in step S3 into a wound dressing.

9. The preparation method of the wound dressing according to claim 8, wherein, In step S1, the stretching multiple of the elastic bottom cloth is 1.2 - 1.

6.

10. The method for preparing the wound dressing according to claim 8 or 9, characterized in that, In step S3, the needling density is 25 - 250 needles per square centimeter.

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