55 results about "Polyvinyl alcohol sponge" patented technology

The invention discloses a preparation method of a chitosan / polyvinyl alcohol sponge dressing containing nano-silver. The invention relates to an antibacterial dressing for therapy of trauma, and the chitosan / polyvinyl alcohol sponge dressing containing the nano-silver is prepared by adding nano-silver / polyvinyl alcohol solution and polyvinyl alcohol / chitosan blend solution. The obtained dressing has good biocompatibility and hemostatic and antibacterial effects, and can promote the wound healing; the product can accelerate the wound healing, release nano-silver particles in a sustained manner, be acted on regenerated bacteria constantly, have the lasting and high-efficient sterilization characteristics and avoid the drug resistance during the wound treatment process; the research on the toxic effect of the material to mouse fibroblasts shows that the product has no obvious toxicity to the cells and has the effect of promoting the growth of the cells; and preparation method has simple process equipment and low price of experimental raw materials and is conductive to industrialization.

The invention provides a medical polyvinyl alcohol sponge and a preparation method. The preparation method comprises the following steps: adding polyvinyl alcohol and starch into distilled water carrying out dissolving at 50 to 95 DEG C under stirring so as to obtain a mixed solution; adding a cross-linking agent, an emulsifier and a foam stabilizer into the mixed solution and carrying out stirring at 20 to 60 DEG C for 2 to 8 h so as to obtain a second mixed solution; adding an acidic catalyst into the second mixed solution and carrying out an acetalation cross-linking reaction at a constant temperature of 20 to 90 DEG C for 30 to 180 min so as to obtain emulsion-like liquid; and completion of the reaction, pouring the emulsion-like liquid into a mold, carrying out heating at 50 to 95 DEG C for curing, carrying out demoulding and washing after cooling, and then carrying out cutting and sterilization so as to obtain the medical polyvinyl alcohol sponge. The medical polyvinyl alcohol sponge prepared in the invention has a through hole structure, uniform pore diameter, good biocompatibility, excellent affinity, high porosity and fast liquid absorption rate, and is applicable to the field of surgical sciences, especially as a sponge consumable for vacuum sealing drainage.

The present invention discloses a polyvinyl alcohol spongy material, which has a three-dimensional perforated structure, average bubble diameter size of 2-3 mm, porosity of 70-98% and a degree of acetalization of 50-85%. The invention also discloses a production method of the polyvinyl alcohol sponge material. The method comprises the steps of: preparing an aqueous solution of polyvinyl alcohol; stirring the polyvinyl alcohol solution, or adding a foaming agent or a pore-forming agent in the aqueous solution of polyvinyl alcohol to obtain a foaming solution; adding aldehyde as a crosslinking agent into the foaming solution to obtain a slurry, curing the slurry, rinsing and drying after forming to obtain a polyvinyl alcohol sponge material, wherein at least one of the slurry acquisition, curing, rinsing and drying processes comprises a process of rising the temperature to 90-150 DEG C and insulating for 10-900 s. Through heat treatment on the foaming system, the polyvinyl alcohol sponge material with larger aperture, high opening rate, good water absorption, high water absorption capacity and high value of application is prepared.

The invention provides a transaminase immobilization method. The method comprises the following steps: oxidizing a hydroxyl group on polyvinyl alcohol sponge, adding transaminase to convert a carbonyl group into an amino group, flocculating, and carrying out cross-linking immobilization by using polyaldehyde to obtain immobilized transaminase. The immobilization method has the advantages of high enzyme activity unit and enzyme purification.

A process for preparing the granular embolizing agent from polyvinyl alcohol includes such steps as dissolving polyvinyl formal in aseptic water for injection, freezing at -20--40 deg.C for 10-12 hr, planning on the obtained ice block multiple times to obtain ice particles, classifying by wet sieving by immersing the sieve in suspension to obtain wet polyvinyl formal particles, freezing again, and dry sieving for classifying.

The invention discloses a functional nasal cavity hemostatic material and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing the following materials in percentage by mass: 5 percent of chitosan derivate, 2 percent to 10 percent of bioactive glass and the balance of water, so as to obtain chitosan mixed suspension; spraying the chitosan mixed suspension on a polyvinyl alcohol sponge blank in a high-pressure atomization and spraying manner and forming a composite functional coating containing chitosan and the bioactive glass on the polyvinyl alcohol sponge blank; drying, compressing and packaging, and sterilizing to obtain the functional nasal cavity hemostatic material. The functional nasal cavity hemostatic material is prepared by adopting the preparation method of the functional nasal cavity hemostatic material. The composite functional coating containing the chitosan and the bioactive glass is added to the surface of a polyvinyl alcohol sponge base material through applying a high-pressure atomization and spraying process, so as to prepare the functional nasal cavity hemostatic material which has remarkable lubrication, moisture-keeping and hemostatic effects and relatively high bacteria-inhibiting effect, can promote the healing of wounds and is comfortable and convenient to use.

The invention relates to a preparation method of sponge, in particular to a preparation method of polyvinyl alcohol medical sponge, and belongs to the technical field of the preparation of a medical dressing. Polyvinyl alcohol is used as a raw material to prepare the methacrylic acylation polyvinyl alcohol with optical activity groups by means of reaction of hydroxyl groups and isocyano groups, and the methacrylic acylation polyvinyl alcohol is foamed and polymerized by means of ultraviolet rays to obtain the polyvinyl alcohol medical sponge. According to the preparation method, an ultraviolet cross-linking curing technology is used, no cross-linking agent is added, so that the toxicity problem caused by the introduction of aldehydes cross-linking agents and hydrazines foaming agents in a traditional polyvinyl alcohol sponge preparation process can be completely avoided, and the biological compatibility is good. Meanwhile, the prepared polyvinyl alcohol medical sponge is soft in texture, good in adaptability to a wound surface, good in dressing property and capable of being widely applied to drainage wounds such as a burnt wound, an ulcer wound and the like. The preparation method is low in cost, simple in process and suitable for the industrialized production.

The invention discloses a polyvinyl alcohol foaming material and a preparation method thereof. According to the method, the foaming technological process is optimized, so that the product technological stability of the polyvinyl alcohol sponge foaming process is effectively improved, the product service life is effectively prolonged, the problems that the polyvinyl alcohol sponge becomes yellow and is aged when used for a long time on the specific condition are solved, the product quality of the polyvinyl alcohol sponge is improved, and the obtained polyvinyl alcohol sponge has higher application value.

The invention discloses a dressing device for wound infection disruption and merged intestinal leakage of an abdominal operation, and belongs to the technical field of clinical medical dressings. The dressing device comprises a suction tube, a double cannula, a drainage tube, a liquid collecting cylinder and a PU (poly urethane) semi-transparent film for sealing a wound, wherein the double cannula consists of an inner tube and an outer tube, and a plurality of side holes are respectively formed in the outer tube and the inner tube; the suction tube, the drainage tube, and the outer tube and inner tube of the double cannula are connected by a cross valve, the liquid outlet end of the drainage tube extends into the liquid collecting cylinder, and the liquid collecting cylinder is connected with a center negative pressure device through a connecting tube; the exterior of the tube wall at the liquid inlet end of the suction tube is coated with composite sponge layers, and a plurality of through holes are formed in the tube wall; the number of composite sponge layers is three, the composite sponge layer for coating the tube wall of the suction tube is a PU foam sponge layer, and polyvinyl alcohol sponge layers are respectively arranged at both sides of the PU foam sponge layer. The dressing device has the advantages that the sealing is reliable, the operation is convenient and rapid, the drainage efficiency is high, the wound is reduced, the wound can be quickly healed, and the pain of a patient is reduced.

The invention discloses a method for increasing the transport survival rate of procambarus clarkii seeds. The method is characterized by comprising the following steps that seed training is carried out to make the seeds gradually adapt to the low-temperature environment and eliminate low-quality seeds; vitamin C is added into fresh water, NaOH is added to regulate the pH value of the water, and meanwhile the water is aerated to obtain transport water; polyvinyl alcohol sponges fully absorb the transport water and then are placed at the bottoms of foam boxes to form special transport boxes; after the seeds are placed in the special transport boxes, the special transport boxes are sealed with covers, holes are drilled in the four walls of each special transport box, the special transport boxes are placed a specialized air-conditioner constant-temperature transport vehicle, and the temperature in the container is controlled to be 10-12 DEG C; after the seeds are transported to a breedingbase, atomizing spraying is carried out with pond or paddy field water, then the seeds are slowly put into the pond or paddy field, and vitamin C is splashed into the whole pond. The method can greatly reduce the stress of the seeds in the transport process, thereby increasing the survival rate of the seeds.

The purpose of the invention is to provide a method for producing medical polyvinyl alcohol sponge, having the advantages of low cost and simple process. The method for producing the medical polyvinylalcohol sponge comprises the following steps: 1, completely dissolving polyvinyl alcohol in water at 80-100 DEG C to obtain an aqueous solution of polyvinyl alcohol; 2, adding a cross-linking agent and a catalyst to the aqueous solution of polyvinyl alcohol, and uniformly stirring the obtained solution; 3, pouring the uniformly stirred solution obtained in step 2 into a die, and carrying out heatinsulation at 50-75 DEG C for 10-24 h to realize setting; and 3, carrying out demolding and cleaning to obtain the medical polyvinyl alcohol sponge. The medical polyvinyl alcohol sponge produced through the method can be used in vacuum drainage carriers, has the advantages of good biocompatibility, porous and easy drainage, strong soft compliance, no shedding particles, clinically needed mechanical performances, small irritation on wounds, unobvious foreign body sensation, and facilitation of the rehabilitation of patients.

The invention discloses a spongy emergency adsorbing material and a preparation method thereof, and belongs to the field of environment material synthesis and application. Artificially-synthesized high molecular materials are adopted as a matrix, according to graft polymerization and a nucleophilic substitution reaction of amine derivatives, a polyvinyl alcohol sponge is used as a skeleton, a grafting reaction and modified synthesis are carried out on the surface, and the spongy emergency adsorbing material is obtained. The preparation method is simple and low in raw material price, the obtained spongy adsorbing material is large in toughness, is provided with pore passages and surfaces with the high hydrophilic performance and can rapidly and efficiently remove various heavy metal ions in water under the group action of the pore passages and the surfaces, the time for equilibrium adsorption of the heavy metal ions such as nickel, copper and lead is only about 10min, and the absorbed sponge is easily recycled and reused after being reproduced. The spongy emergency adsorbing material is particularly suitable for the emergency disposal of an emergency heavy metal water contamination accident which happens in natural water such as a riverway and a lake.

The invention discloses a binding dressing specially used after limb dismemberment surgery. The binding dressing is characterized in that a sleeve with one closed end is included; a pasting membrane of a semipermeable membrane is arranged on the outer side of the sleeve; an adsorption tray is arranged outside the position, at the closed end of the sleeve, of the pasting membrane, a through hole is formed in the position, corresponding to the pasting membrane, of the adsorption tray, and a negative pressure suction pipe on the adsorption tray penetrates through the through hole to continuously provide negative pressure suction for the sleeve; the stump end of an amputated limb is sleeved with the sleeve, the pasting membrane wraps the sleeve, continuous negative pressure suction is carried out by the negative pressure suction pipe, a barrel-shaped composite nano-silver poval sponge is tightened under the action of the negative pressure, the even compression function is formed on the stump end of the limb, the whole wounded part can be in contact with the dressing, the dressing has the strong and broad-spectrum infection resisting function, the good promoting function on the union of a wound is achieved, the percolate of the wound flows out of a drainage pipe, and the wound is kept clean.

The invention discloses a polyvinyl alcohol sponge production method, and relates to the field of polyvinyl alcohol sponge production, polyvinyl acetal resin is dissolved in an alcohol aqueous solution to form polyvinyl acetal to-be-foamed rubber with the mass fraction of 5-25%; the preparation method comprises the following steps: preparing 0.01%-3% of a foaming substance with high foaming performance by using an alcohol aqueous solution, and foaming the foaming substance by using a foaming machine or a foaming machine, or directly stirring and foaming the foaming substance to obtain stable foam slurry; and adding the obtained foam slurry into a polyvinyl acetal resin adhesive to be foamed, uniformly stirring to obtain a foamed colloid, and shaping the foamed colloid by a cooling method to obtain the polyvinyl alcohol sponge. And cleaning and cutting the sponge to obtain a finished product. According to the invention, the polyvinyl acetal resin is directly foamed and then cooled for molding, only physical changes are involved in the foaming production link, chemical changes such as acetalization are avoided, a new thought is provided for industrialization upgrading of polyvinyl alcohol sponge, and the whole process is free of chemical changes, clean and environment-friendly.

A menstrual sanitary sponge for gynecological disease treatment, comprising a sponge body. The shape of the sponge body is cylindrical. The top of the sponge body is hemispherical. An annular, spiral, hemispherical, or hook-shaped groove is provided on the surface of the sponge body. The sponge body is a compressed medical polyvinyl alcohol sponge.

The invention relates to a preparation method of an acellular matrix fiber sponge. The preparation method comprises the following steps of: taking a wet acellular matrix, cutting the acellular matrix into fragments, and mashing the fragments at a high speed in a short time; taking the acellular matrix, glacial acetic acid and purified water, mixing and cooling; homogenizing at certain frequency, homogenizing the collected feed liquid for multiple times, filtering out coarse particles, adjusting the pH value of filtered slurry by using a NaOH solution, and centrifuging to obtain acellular matrix fibers; taking the acellular matrix fibers, preparing the acellular matrix fibers into aqueous dispersion liquid with the mass fraction of 0.5%-10%, and adjusting the pH value to 4-8; and covering the acellular matrix fiber with a polyurethane sponge layer or a polyvinyl alcohol sponge layer, then, performing vacuum freeze drying, cutting, packaging and sterilizing to obtain the acellular matrix fiber sponge. The acellular matrix fiber sponge disclosed by the invention is in direct contact with a wound surface, so that tissues are prevented from growing into the acellular matrix fiber sponge, and secondary injury caused by dressing change or taking down is reduced.

The invention discloses a functional nasal cavity hemostatic material and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing the following materials in percentage by mass: 5 percent of chitosan derivate, 2 percent to 10 percent of bioactive glass and the balance of water, so as to obtain chitosan mixed suspension; spraying the chitosan mixed suspension on a polyvinyl alcohol sponge blank in a high-pressure atomization and spraying manner and forming a composite functional coating containing chitosan and the bioactive glass on the polyvinyl alcohol sponge blank; drying, compressing and packaging, and sterilizing to obtain the functional nasal cavity hemostatic material. The functional nasal cavity hemostatic material is prepared by adopting the preparation method of the functional nasal cavity hemostatic material. The composite functional coating containing the chitosan and the bioactive glass is added to the surface of a polyvinyl alcohol sponge base material through applying a high-pressure atomization and spraying process, so as to prepare the functional nasal cavity hemostatic material which has remarkable lubrication, moisture-keeping and hemostatic effects and relatively high bacteria-inhibiting effect, can promote the healing of wounds and is comfortable and convenient to use.

The invention discloses a polyvinyl alcohol sponge with high elongation and a preparation method thereof. The method comprises the following steps: mixing polyvinyl alcohol, cellulose, carbonate and deionized water, and performing stirring under a closed condition until the components are completely dissolved to obtain a uniform polyvinyl alcohol solution; adding a mixture of an emulsifier and esters into the polyvinyl alcohol solution, and performing stirring until the reaction is complete to obtain a white viscous solution; adding a foaming agent into the white viscous solution, and performing stirring by using a strong stirrer until bubbles with uniform sizes are generated in the solution, so as to obtain a foamed solution; and pouring the foamed solution into a mold, and carrying out freeze thawing to obtain the polyvinyl alcohol sponge with high elongation. Compared with an existing polyvinyl alcohol sponge manufacturing process, the freeze thawing method used in the method has the advantages of being easy to control, good in environmental protection property, little in resource waste, capable of avoiding harm of formaldehyde to human health and the like.

The invention provides a method for repeatedly extracting purified water by using a hyaluronic acid-graphene oxide loaded polyvinyl alcohol sponge as forward osmosis drawing substance, and belongs tothe technical field of environmental pollution control engineering. A hydrophilic compression-resistant sponge is used as the forward osmosis drawing substance, and is applied to a forward osmosis process; water is drawn with a technique; the water production rate is high; and a regeneration method is simplified. The drawing substance prepared in the method keeps a higher water flux as the structural characteristic of the drawing substance can completely avoid reverse osmosis. In addition, based on a PVA substrate excellent in mechanical performance, the irreversible deformation of the drawingsubstance can be greatly relieved; and the service life of drawing substance is prolonged. The drawing substance is regenerated and regeneration and water production procedures can be completed within a short time by only needing simple mechanical compression. A substrate material is low-cost, is easy to obtain, and can be produced on a large scale, which is beneficial to the large-scale preparation and wide application of the drawing substance.

The invention discloses a polyvinyl alcohol supported palladium nanoflower water treatment catalyst and a preparation method thereof. The catalyst takes porous polyvinyl alcohol sponge as a carrier and palladium nanoflowers as a catalytic active component. Based on the mass of the carrier, the mass percentage of the palladium nanoflower is 0.1%-0.5%. The preparation method comprises the followingsteps: cutting porous polyvinyl alcohol sponge into wafers with the diameter of 12mm and the thickness of 2mm by using a laser cutting instrument, then carrying out modification treatment on the surfaces of the wafers by using plasmas, dipping the polyvinyl alcohol sponge into a palladium nanoflower colloidal solution, and carrying out vacuum drying to obtain the polyvinyl alcohol supported palladium nanoflower water treatment catalyst. The catalyst is environment-friendly and low in cost, can efficiently catalyze and reduce water pollutants such as p-nitrophenol, methyl orange and methylene blue, and has a wide market application prospect.

The invention discloses a cleaning polyvinyl alcohol sponge, which is characterized by the following: setting interphase concave-convex embossing on the sponge surface; proceeding the embossing through hard disposal to enlarge the surface friction. The invention displays better cleaning effect, which reduces the productive cost and lengthens the utility lifetime.

The invention brings forward a negative pressure drainage system for a wound. The negative pressure drainage system comprises a polyethylene alcohol hydration sponge, a medical wound film, a drainagetube and a negative pressure drainage device, wherein a medical PVC bag is mounted on the polyethylene alcohol hydration sponge; a plurality of drainage holes are formed in a rectangular array in theside wall of one surface where the medical PVC bag contacts with the polyethylene alcohol hydration sponge; a drainage tube joint is connected to an opening of the medical PVC bag; the medical PVC bagand the polyethylene alcohol hydration sponge are fully covered with the medical wound film; the negative pressure drainage device is a negative pressure drainage bag device and a negative pressure ball is independently arranged; and a drainage tube joint of the medical PVC bag is connected with a drainage joint of the negative pressure drainage bag device. The medical PVC bag works as a transition carrier for negative pressure drainage; multi-point contact is formed on the polyethylene alcohol hydration sponge, so comprehensive and thorough drainage can be obtained; the negative pressure ball of the negative pressure drainage tube bag device is independently arranged, so the negative pressure ball can be repeatedly utilized; and drainage smoothness can be further guaranteed.

The invention relates to a negative-pressure drainage device, which comprises at least one drainage tube. The drainage tube comprises an inlet section and an outlet section, the inlet section is arranged in polyvinyl alcohol sponge, the tube wall of the inlet section is provided with at least one drainage hole, the outlet section is arranged outside the polyvinyl alcohol sponge and is provided with an external connection port, a plug is arranged in the external connection port, the end of the outlet section is connected with a container, and the container is connected with a negative pressure source. The negative-pressure drainage device is suitable for surgical drainage.

The invention discloses an improved foaming production process method for polyvinyl alcohol sponge, and relates to the field of polyvinyl alcohol sponge production.The improved foaming production process method comprises the steps that under the condition that a molecular chain of polyvinyl alcohol has water solubility, the molecular side chain is modified, other functional groups are introduced, and a polyvinyl alcohol modified substance is formed; preparing the modifier into a 0.1%-2% aqueous solution to obtain bubble water with higher foaming performance, foaming the bubble water by using a foaming machine or a foaming machine, or directly stirring and foaming the bubble water to obtain stable foam slurry, adding the obtained foam slurry into a polyvinyl alcohol sponge slurry system to be foamed, uniformly stirring, and performing cross-linking curing to obtain the polyvinyl alcohol sponge slurry. In the crosslinking and curing process, the polyvinyl alcohol sponge and the polyvinyl alcohol sponge together become one part of a sponge body. The foaming agent solution is firstly foamed and then is mixed with the system slurry, so that the foam component and the system slurry can be quickly and uniformly mixed at a lower rotating speed without introducing gas by stirring the whole system slurry at a high speed, and the purpose of uniform foaming is achieved.

The invention relates to the technical field of sewage purification, in particular to a graphene sewage purification material and a preparation method thereof. The graphene sewage purification material is prepared by the following four formulas: 1, 10-20 parts of graphene powder, 2-10 parts of polyacrylamide and 60-80 parts of polypropylene pyrrolidone; 2, one of a 100-800-mesh mesh fabric, a polyester mesh fabric, an acrylic fabric, a polypropylene fabric, a spandex fabric and a nylon fabric; 3, one or more of polyurethane sponge, polyvinyl alcohol sponge and melamine sponge, 100-150 parts of absolute ethyl alcohol, 5-10 parts of tetraethoxysilane, 2-5 parts of ammonia water and 2-3 parts of deionized water; and 4, a PVA aqueous solution or cross-linked PVA hydrogel are prepared by usingone or more of boric acid, borax and glutaraldehyde as a cross-linking agent. According to the invention, the prepared graphene sewage purification device is convenient to use, can perform large-scale oil-water separation, does not need to perform any post-treatment on a filter screen after separation, improves the analysis efficiency, and is long in service life.

The invention provides a medical polyvinyl alcohol sponge and a preparation method. The preparation method comprises the following steps: adding polyvinyl alcohol and starch into distilled water carrying out dissolving at 50 to 95 DEG C under stirring so as to obtain a mixed solution; adding a cross-linking agent, an emulsifier and a foam stabilizer into the mixed solution and carrying out stirring at 20 to 60 DEG C for 2 to 8 h so as to obtain a second mixed solution; adding an acidic catalyst into the second mixed solution and carrying out an acetalation cross-linking reaction at a constant temperature of 20 to 90 DEG C for 30 to 180 min so as to obtain emulsion-like liquid; and completion of the reaction, pouring the emulsion-like liquid into a mold, carrying out heating at 50 to 95 DEG C for curing, carrying out demoulding and washing after cooling, and then carrying out cutting and sterilization so as to obtain the medical polyvinyl alcohol sponge. The medical polyvinyl alcohol sponge prepared in the invention has a through hole structure, uniform pore diameter, good biocompatibility, excellent affinity, high porosity and fast liquid absorption rate, and is applicable to the field of surgical sciences, especially as a sponge consumable for vacuum sealing drainage.

The invention discloses a preparation method of a chitosan / polyvinyl alcohol sponge dressing containing nano-silver. The invention relates to an antibacterial dressing for therapy of trauma, and the chitosan / polyvinyl alcohol sponge dressing containing the nano-silver is prepared by adding nano-silver / polyvinyl alcohol solution and polyvinyl alcohol / chitosan blend solution. The obtained dressing has good biocompatibility and hemostatic and antibacterial effects, and can promote the wound healing; the product can accelerate the wound healing, release nano-silver particles in a sustained manner, be acted on regenerated bacteria constantly, have the lasting and high-efficient sterilization characteristics and avoid the drug resistance during the wound treatment process; the research on the toxic effect of the material to mouse fibroblasts shows that the product has no obvious toxicity to the cells and has the effect of promoting the growth of the cells; and preparation method has simple process equipment and low price of experimental raw materials and is conductive to industrialization.

The invention provides a polyvinyl alcohol sponge with an ordered porous structure prepared on the basis of a 3D printing template and an application thereof. When the sponge with ordered micro-channels makes contact with blood, the sponge can rapidly guide and absorb the blood, and a large number of regularly-arranged red blood cells are gathered in the micro-porous structure at the bottom of the sponge. The sponge prepared by combining structured ordered micro-channels and disordered holes greatly shortens the blood coagulation time and improves the hemostasis efficiency. The used raw materials have excellent biocompatibility, and potential biological safety and side effects are eliminated in the clinical use process. The used raw materials have excellent blood compatibility, do not cause hemolytic reaction and do not affect endogenous and exogenous blood coagulation pathways.

The invention discloses a novel antibacterial moisture-absorbing quick-drying welt-turned sock which comprises a welt-turned sock body, hook-and-loop fastener loops, turned welt indentations, an elastic soft cushion and a polyurethane antiskid coating layer. The turned welt indentations at equal intervals are arranged on the surface of the top end of the welt-turned sock body. Fixed tying bands are attached to the positions, on the two sides of the turned welt indentations, of the surface of the welt-turned sock body respectively. The hook-and-loop fastener loops and hook-and-loop fastener hooks are arranged at the centers of the surfaces of the fixed tying bands respectively. The elastic soft cushion is arranged on the side, away from the turned welt indentations, of the welt-turned sockbody. Wear-resistant layers are sewn on the positions, on the two sides of the elastic soft cushion, of the surface of the welt-turned sock body. A spandex sweat-absorbing layer is arranged on the inner side wall of the bottom end of a graphene antibacterial layer. A polyvinyl alcohol sponge layer is arranged on the inner wall of the end, away from the spandex sweat-absorbing layer, of the welt-turned sock body. The comfort degree of the welt-turned sock during wearing is improved, the sweat-absorbing and odor-preventing functions of the welt-turned sock are improved, and the memory function of the turning width is realized.

A special dressing for limb separation surgery, which is characterized in that it includes a sleeve with a closed end; a semi-permeable film is provided on the outside of the sleeve; an adsorption disc is provided outside the film at the closed end of the sleeve to absorb There is a through hole at the corresponding position between the disk and the film. The negative pressure suction tube on the adsorption disk passes through the through hole to continuously provide negative pressure suction for the sleeve; put the sleeve on the amputation stump, wrap the film on the sleeve, and pass through The negative pressure suction tube performs continuous negative pressure suction. The cylindrical composite nano-silver polyvinyl alcohol sponge tightens under the action of negative pressure, forming a uniform compression effect on the limb stump. The dressing can be exposed to the wound site, and the dressing has strong It has an effective and broad-spectrum anti-infection effect, and has a good promoting effect on wound healing. The wound exudate flows out through the drainage tube, keeping the wound clean.