CN114870062B - Composite wound dressing and preparation process thereof - Google Patents
Composite wound dressing and preparation process thereof Download PDFInfo
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- CN114870062B CN114870062B CN202210539321.3A CN202210539321A CN114870062B CN 114870062 B CN114870062 B CN 114870062B CN 202210539321 A CN202210539321 A CN 202210539321A CN 114870062 B CN114870062 B CN 114870062B
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- 239000002131 composite material Substances 0.000 title claims abstract description 73
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 239000000741 silica gel Substances 0.000 claims abstract description 38
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 38
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 34
- 238000010521 absorption reaction Methods 0.000 claims abstract description 25
- 239000000499 gel Substances 0.000 claims abstract description 20
- 239000000758 substrate Substances 0.000 claims abstract description 20
- 239000000853 adhesive Substances 0.000 claims abstract description 12
- 230000001070 adhesive effect Effects 0.000 claims abstract description 11
- 229920006264 polyurethane film Polymers 0.000 claims abstract description 11
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract 3
- 229910052710 silicon Inorganic materials 0.000 claims abstract 3
- 239000010703 silicon Substances 0.000 claims abstract 3
- 239000000835 fiber Substances 0.000 claims description 31
- 239000004745 nonwoven fabric Substances 0.000 claims description 16
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 12
- 238000007493 shaping process Methods 0.000 claims description 9
- 229920001296 polysiloxane Polymers 0.000 claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 4
- 238000013329 compounding Methods 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 4
- 239000011496 polyurethane foam Substances 0.000 claims description 4
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 claims description 3
- 229920003043 Cellulose fiber Polymers 0.000 claims description 3
- 229920001661 Chitosan Polymers 0.000 claims description 3
- 239000004831 Hot glue Substances 0.000 claims description 3
- 229940072056 alginate Drugs 0.000 claims description 3
- 229920000615 alginic acid Polymers 0.000 claims description 3
- 235000010443 alginic acid Nutrition 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- -1 silica gel compound Chemical group 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 241000894006 Bacteria Species 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 115
- 208000027418 Wounds and injury Diseases 0.000 description 34
- 206010052428 Wound Diseases 0.000 description 33
- 230000002209 hydrophobic effect Effects 0.000 description 8
- 239000012790 adhesive layer Substances 0.000 description 3
- 239000002981 blocking agent Substances 0.000 description 3
- 208000004210 Pressure Ulcer Diseases 0.000 description 2
- 206010048038 Wound infection Diseases 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 206010011985 Decubitus ulcer Diseases 0.000 description 1
- 206010061218 Inflammation Diseases 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
- A61L15/24—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/02—Adhesive bandages or dressings
- A61F13/0203—Adhesive bandages or dressings with fluid retention members
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/02—Adhesive bandages or dressings
- A61F13/023—Adhesive bandages or dressings wound covering film layers without a fluid retention layer
- A61F13/0233—Adhesive bandages or dressings wound covering film layers without a fluid retention layer characterised by the oclusive layer skin contacting layer
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/02—Adhesive bandages or dressings
- A61F13/0276—Apparatus or processes for manufacturing adhesive dressings or bandages
- A61F13/0289—Apparatus or processes for manufacturing adhesive dressings or bandages manufacturing of adhesive dressings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/18—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing inorganic materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
- A61L15/26—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
- A61L15/28—Polysaccharides or their derivatives
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Animal Behavior & Ethology (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- General Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Epidemiology (AREA)
- Materials Engineering (AREA)
- Hematology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Dermatology (AREA)
- Materials For Medical Uses (AREA)
Abstract
The invention discloses a composite wound dressing and a preparation process thereof, wherein the composite wound dressing comprises a release layer, a silica gel composite layer, an intermediate layer and a substrate layer, a cavity is formed between the silica gel composite layer and the substrate layer, the intermediate layer is arranged in the cavity, the silica gel composite layer is provided with a window, and the size of the window is smaller than that of the intermediate layer; the silicon gel composite layer sequentially comprises silicon gel, a polyurethane film and polyacrylate adhesive from top to bottom, the intermediate layer sequentially comprises a contact layer, a first bonding layer and a moisture absorption layer from top to bottom, and the base material layer sequentially comprises a second bonding layer and a waterproof breathable layer from top to bottom; the silica gel composite layer and the second bonding layer are both provided with through holes. According to the composite wound dressing and the preparation process thereof, the substrate layer is attached to the silica gel composite layer, the middle layer is wrapped in the middle, the wound dressing is firmly fixed, the dressing is prevented from falling off in a layered manner, the energy consumption is low, the production efficiency is higher, and the liquid absorbing capacity of a product is greatly improved. Meanwhile, the dressing is water-resistant and bacteria-resistant, and the clinical operation is simpler and more convenient.
Description
Technical Field
The invention relates to the technical field of medical dressing, in particular to a composite wound dressing and a preparation process thereof.
Background
The invention patent with the publication number of CN 103655046A describes a wound dressing with a three-layer structure and a preparation method thereof, wherein the wound dressing is provided with a wound contact layer, an intermediate moisture absorption layer and an outer layer, the wound contact layer is a non-woven fabric containing hydrophilic fibers and hydrophobic fibers, the intermediate moisture absorption layer is a non-woven fabric containing another group of hydrophilic fibers and hydrophobic fibers, and the outer layer is a non-woven fabric containing hydrophobic fibers. The wound contact layer contains hydrophobic fibers, and the hydrophobic fibers can be easily adhered to wound tissues after contacting the wound surface for a long time because the hydrophobic fibers do not absorb water, so that secondary injury of the wound surface and pain are easily caused when the wound surface dressing is uncovered. The middle moisture absorption layer is another group of hydrophilic fibers and hydrophobic fibers; the fiber has high hardness and no elasticity, and can cause discomfort to the wound surface of a patient after being applied for a long time. The outer layer is hydrophobic fiber non-woven fabric, has no water-blocking and bacteria-blocking properties, and is easy to be invaded by microorganisms to cause wound infection. And this dressing does not have self-adhesion function, need to paste fixedly with the dressing of secondary stickness, has increased the quantity of medical consumables, brings the operation inconvenience. The liquid absorption of the dressing is between 30 and 50 grams per square meter, and the liquid absorption of a wound surface with large liquid permeability is still to be improved.
The preparation method of the dressing is also introduced: the method comprises the steps of preparing each layer in a hot melting mode, a needling mode or a water needling mode and a chemical bonding agent mode, adding bicomponent fibers, and compounding each layer together in a hot melting mode, a needling mode or a water needling mode and a chemical bonding agent mode, wherein the bonding strength is not high. After the dressing prepared by the method absorbs moisture or wound seepage, the peel strength between the contact layer and the moisture absorption layer is 0.2-0.6N/cm, the bonding strength between the moisture absorption layer and the outer layer is 0.05-0.2N/cm, the bonding strength between the layers is not high, and the dressing is easy to separate and fall off.
Based on the above situation, the invention provides a composite wound dressing and a preparation process thereof, which can effectively solve the problems.
Disclosure of Invention
The invention aims to provide a composite wound dressing and a preparation process thereof. The composite wound dressing and the preparation process thereof are convenient to use, the intermediate layer is wrapped in the middle by attaching the substrate layer and the silica gel composite layer, so that the dressing is firmly fixed, the dressing is prevented from falling off in a layered manner, the energy consumption is low, the production efficiency is higher, and the liquid absorbing capacity of the product is greatly improved. Meanwhile, the dressing water-blocking bacteria-blocking agent has self-adhesion, good application property and simpler and more convenient clinical operation.
The invention is realized by the following technical scheme:
the composite wound dressing comprises a release layer, a silica gel composite layer, an intermediate layer and a substrate layer, wherein a cavity is formed between the silica gel composite layer and the substrate layer, the intermediate layer is arranged in the cavity, a window is formed in the silica gel composite layer, and the size of the window is smaller than that of the intermediate layer;
the silica gel composite layer sequentially comprises silica gel, a polyurethane film and polyacrylate adhesive from top to bottom, the middle layer sequentially comprises a contact layer, a first bonding layer and a moisture absorption layer from top to bottom, and the base material layer sequentially comprises a second bonding layer and a waterproof breathable layer from top to bottom.
The invention aims to provide a composite wound dressing and a preparation process thereof. The composite wound dressing and the preparation process thereof are convenient to use, the intermediate layer is wrapped in the middle by attaching the substrate layer and the silica gel composite layer, so that the dressing is firmly fixed, the dressing is prevented from falling off in a layered manner, the energy consumption is low, the production efficiency is higher, and the liquid absorbing capacity of the product is greatly improved. Meanwhile, the dressing water-blocking bacteria-blocking agent has self-adhesion, good application property and simpler and more convenient clinical operation.
Preferably, the silica gel composite layer and the second bonding layer are both provided with through holes.
Preferably, the contact layer is a gel fiber non-woven fabric, the moisture absorption layer is polyurethane foam or polyvinyl alcohol foam, the waterproof breathable layer is a polyurethane film or polyurethane elastic non-woven fabric, the first bonding layer is a hot melt adhesive net film or a net point film, and the second bonding layer is a pressure-sensitive adhesive.
Preferably, the material of the gel fiber non-woven fabric is one or more of alginate fibers, modified cellulose fibers, modified chitosan fibers and polyvinyl alcohol fibers.
Preferably, the gram weight of the gel fiber non-woven fabric is 80-180 g/m 2 The thickness is 1.0-5.0 mm, and the gram weight of the first bonding layer is 8-50 g/m 2 The thickness of the moisture absorption layer is 2-5 mm.
Preferably, the thickness of the waterproof breathable layer is 10-150 mu m, and the gram weight of the pressure-sensitive adhesive is 10-40 g/m 2 。
Preferably, the thickness of the polyurethane film is 10-40 mu m, and the gram weight of the silica gel is 30-300 g/m 2 The gram weight of the polyacrylate adhesive is 10-40 g/m 2 。
Preferably, the shape of the through hole is a circle, a diamond or a polygon.
Preferably, the release layer comprises a first release film and a second release film, wherein a bending part is arranged at one end of the first release film close to the middle of the wound dressing, and the second release film is partially covered on the bending part of the first release film.
A process for preparing a composite wound dressing, comprising the steps of:
step S1: unreeling and flatly paving the contact layer, the first bonding layer and the moisture absorption layer, and putting the materials into a tentering and shaping oven for shaping, wherein the temperature of the oven is 90-200 ℃, the drying time is 10-600 s, and the material entering speed is 1-10 m/min;
step S2: rapidly pressing by two press rolls, cooling and shaping at room temperature, and preparing a composite coiled material;
step S3: respectively unreeling the substrate layer, the composite coiled material, the silica gel composite layer and the release layer in multi-station dressing equipment;
step S4: cutting the composite coiled material into slices through a first cutter after unreeling, and attaching the composite coiled material to the pressure-sensitive adhesive of the unreeled substrate layer;
step S5: unwinding the silicone gel composite layer, and attaching the edges of the silicone gel composite layer with one side of the polyacrylate adhesive facing the pressure-sensitive adhesive of the substrate layer;
step S6: the silica gel composite layer is provided with a window in the middle through a second cutter;
step S7: the three materials of the base material layer, the composite coiled material and the silica gel composite layer are pressed by a pressing roller, so that the three materials are tightly adhered and compounded;
step S8: and compounding a release layer at the silica gel position of the silica gel compound layer, and cutting and forming by a forming cutting die.
Compared with the prior art, the invention has the following advantages:
the composite wound dressing and the preparation process thereof are convenient to use, the intermediate layer is wrapped in the middle by attaching the substrate layer and the silica gel composite layer, so that the dressing is firmly fixed, the dressing is prevented from falling off in a layered manner, the energy consumption is low, the production efficiency is higher, and the liquid absorbing capacity of the product is greatly improved. Meanwhile, the dressing water-blocking bacteria-blocking agent has self-adhesion, good application property and simpler and more convenient clinical operation.
Drawings
FIG. 1 is a schematic structural view of a composite wound dressing according to the present invention;
FIG. 2 is a schematic flow chart of a first part of the preparation process according to the present invention;
FIG. 3 is a schematic flow chart of a second part of the preparation process according to the present invention.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, preferred embodiments of the present invention will be described below with reference to specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.
Example 1:
as shown in fig. 1 to 3, the invention provides a composite wound dressing, which comprises a release layer 1, a silica gel composite layer 13, an intermediate layer and a substrate layer 14, wherein a cavity is formed between the silica gel composite layer 13 and the substrate layer 14, the intermediate layer is arranged in the cavity, the silica gel composite layer 13 is provided with a window, and the size of the window is smaller than that of the intermediate layer;
the silica gel composite layer 13 sequentially comprises a silica gel 2, a polyurethane film 3 and a polyacrylate adhesive 4 from top to bottom, the middle layer sequentially comprises a contact layer 5, a first bonding layer 6 and a moisture absorption layer 7 from top to bottom, and the base material layer 14 sequentially comprises a second bonding layer 8 and a waterproof breathable layer 9 from top to bottom.
Further, in another embodiment, the silicone gel composite layer 13 and the second adhesive layer 8 are both provided with through holes.
Further, in another embodiment, the contact layer 5 is a gel fiber non-woven fabric, the moisture absorption layer 7 is polyurethane foam or polyvinyl alcohol foam, the waterproof and breathable layer 9 is a polyurethane film 3 or polyurethane elastic non-woven fabric, the first adhesive layer 6 is a hot melt adhesive net film or a mesh point film, and the second adhesive layer 8 is a pressure sensitive adhesive.
Polyurethane foam or polyvinyl alcohol foam is soft and elasticSex, does not press the wound, can prevent pressure sore bedsores; the polyurethane film 3 has the functions of water resistance and bacteria resistance, greatly reduces the pollution, infection and inflammation of microorganisms of wounds, and has extremely high water vapor transmittance, wherein the water vapor transmittance is more than 2000 g/(24 h x m) 2 )；
Further, in another embodiment, the material of the gel fiber nonwoven fabric is one or more of alginate fibers, modified cellulose fibers, modified chitosan fibers, and polyvinyl alcohol fibers.
Further, in another embodiment, the gel fiber nonwoven fabric has a gram weight of 80 to 180g/m 2 The thickness is 1.0-5.0 mm, the gram weight of the first bonding layer 6 is 8-50 g/m 2 The thickness of the moisture absorption layer 7 is 2-5 mm.
Further, in another embodiment, the thickness of the waterproof and breathable layer 9 is 10-150 μm, and the gram weight of the pressure-sensitive adhesive is 10-40 g/m 2 。
Further, in another embodiment, the polyurethane film 3 has a thickness of 10 to 40 μm, and the silicone gel 2 has a gram weight of 30 to 300g/m 2 The gram weight of the polyacrylate adhesive 4 is 10-40 g/m 2 。
Further, in another embodiment, the shape of the through hole is a circle, a diamond, or a polygon.
Further, in another embodiment, the release layer 1 includes a first release film 15 and a second release film 16, where a bending portion 151 is disposed at one end of the first release film 15 near the middle of the wound dressing, and the second release film 16 partially covers the bending portion 151 of the first release film 15.
Due to the structure, the release layer is convenient for a user to tear off.
According to another aspect of the present invention, there is provided a process for preparing a composite wound dressing comprising the steps of:
step S1: unreeling and flatly paving the contact layer 5, the first bonding layer 6 and the moisture absorption layer 7, and putting the materials into a tentering shaping oven 10 for shaping, wherein the temperature of the oven is 90-200 ℃, the drying time is 10-600 s, and the material entering speed is 1-10 m/min;
step S2: rapidly pressing through two press rolls 11, and cooling and shaping at room temperature to prepare a composite coiled material 12;
step S3: respectively unreeling the substrate layer 14, the composite coiled material 12, the silica gel composite layer 13 and the release layer 1 in multi-station dressing equipment;
step S4: the composite coiled material 12 is cut into a sheet shape through a first cutter 17 after unreeling, and is attached to the pressure-sensitive adhesive of the unreeled substrate layer 14;
step S5: unwinding the silicone gel composite layer 13, and attaching the edges of the polyacrylate adhesive 4 with one side of the adhesive facing the pressure-sensitive adhesive of the substrate layer 14;
step S6: the silicone gel composite layer 13 is provided with a window in the middle through a second cutter 18;
step S7: the three materials of the base material layer 14, the composite coiled material and the silica gel composite layer 13 are pressed by the pressing roller 11, so that the three materials are tightly adhered and compounded;
step S8: and compounding the release layer 1 at the silica gel 2 of the silica gel compound layer 13, and cutting and forming by a forming cutter die 19.
The composite wound dressing has elasticity, has a self-adhesive function, is not adhered to a wound, and is comfortable to wear by a patient. The outer layer has the performance of water blocking and bacteria blocking, prevents wound infection and simplifies nurse operation. The liquid absorption amount of the dressing is more than 40 g/square meter, and the dressing can absorb the seepage permanently, and the service time is up to 7 days.
After absorbing moisture or absorbing wound seepage, the peel strength between the contact layer 5 and the moisture absorption layer 7 after moisture absorption is greater than 0.6N/cm, the bonding strength between the moisture absorption layer 7 and the outer layer is greater than 0.2N/cm, and the composite dressing has higher liquid absorption capacity than that of a common composite dressing, has high bonding strength between the layers and is not easy to separate and fall off.
The composite wound dressing of the present invention and its manufacturing process can be easily manufactured or used by those skilled in the art from the description of the present invention and the accompanying drawings, and can produce the positive effects described in the present invention.
Unless specifically stated otherwise, in the present invention, if there are terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the positional relationship indicated is based on the positional relationship indicated in the drawings, and is merely for convenience of describing the present invention and simplifying the description, and it is not necessary to indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationship in the present invention are merely for exemplary illustration and should not be construed as limitations of the present patent, and it is possible for those skilled in the art to understand the specific meaning of the above terms in conjunction with the drawings and according to the specific circumstances.
Unless specifically stated or limited otherwise, the terms "disposed," "connected," and "connected" herein are to be construed broadly, e.g., they may be fixed, removable, or integral; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present invention fall within the scope of the present invention.
Claims (2)
1. A composite wound dressing, characterized in that: the silicon gel composite layer is provided with a window, and the size of the window is smaller than that of the middle layer;
the silica gel composite layer sequentially comprises silica gel, a polyurethane film and polyacrylate adhesive from top to bottom, the intermediate layer sequentially comprises a contact layer, a first bonding layer and a moisture absorption layer from top to bottom, and the substrate layer sequentially comprises a second bonding layer and a waterproof breathable layer from top to bottom;
the contact layer is gel fiber non-woven fabric, the moisture absorption layer is polyurethane foam or polyvinyl alcohol foam, the waterproof breathable layer is polyurethane film or polyurethane elastic non-woven fabric, the first bonding layer is a hot melt adhesive net film or a net point film, and the second bonding layer is pressure-sensitive adhesive;
the gel fiber non-woven fabric is made of one or more of alginate fibers, modified cellulose fibers, modified chitosan fibers and polyvinyl alcohol fibers;
the gram weight of the gel fiber non-woven fabric is 80-180 g/m 2 The thickness is 1.0-5.0 mm, and the gram weight of the first bonding layer is 8-50 g/m 2 The thickness of the moisture absorption layer is 2-5 mm;
the thickness of the waterproof breathable layer is 10-150 mu m, and the gram weight of the pressure-sensitive adhesive is 10-40 g/m 2 ；
The thickness of the polyurethane film is 10-40 mu m, and the gram weight of the silica gel is 30-300 g/m 2 The gram weight of the polyacrylate adhesive is 10-40 g/m 2 ；
The release layer comprises a first release film and a second release film, wherein one end of the first release film, which is close to the middle of the wound dressing, is provided with a bending part, and the second release film is partially covered on the bending part of the first release film;
the silica gel composite layer and the second bonding layer are both provided with through holes;
the through holes are round, diamond or polygonal in shape.
2. A process for preparing a composite wound dressing as claimed in claim 1, wherein: the method comprises the following steps:
step S1: unreeling and flatly paving the contact layer, the first bonding layer and the moisture absorption layer, and putting the materials into a tentering and shaping oven for shaping, wherein the temperature of the oven is 90-200 ℃, the drying time is 10-600 s, and the material entering speed is 1-10 m/min;
step S2: rapidly pressing by two press rolls, cooling and shaping at room temperature, and preparing a composite coiled material;
step S3: respectively unreeling the substrate layer, the composite coiled material, the silica gel composite layer and the release layer in multi-station dressing equipment;
step S4: cutting the composite coiled material into slices through a first cutter after unreeling, and attaching the composite coiled material to the pressure-sensitive adhesive of the unreeled substrate layer;
step S5: unwinding the silicone gel composite layer, and attaching the edges of the silicone gel composite layer with one side of the polyacrylate adhesive facing the pressure-sensitive adhesive of the substrate layer;
step S6: the silica gel composite layer is provided with a window in the middle through a second cutter;
step S7: the three materials of the base material layer, the composite coiled material and the silica gel composite layer are pressed by a pressing roller, so that the three materials are tightly adhered and compounded;
step S8: and compounding two release layers at the silica gel position of the silica gel compound layer, and cutting and forming by a forming cutting die.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105749325A (en) * | 2016-04-11 | 2016-07-13 | 武汉海吉亚生物科技有限公司 | Medical silica gel dressing and manufacture method thereof |
| CN207024173U (en) * | 2016-11-17 | 2018-02-23 | 上海亚澳医用保健品有限公司 | A kind of novel silicon gel foam dressing |
| CN216985838U (en) * | 2022-01-04 | 2022-07-19 | 杜克有限责任公司 | Silica gel foam dressing |
| CN216985837U (en) * | 2022-01-04 | 2022-07-19 | 杜克有限责任公司 | Silica gel foam dressing |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0606661D0 (en) * | 2006-04-03 | 2006-05-10 | Brightwake Ltd | Improvements relating to dressings |
| DE502006008725D1 (en) * | 2006-11-07 | 2011-02-24 | Hartmann Paul Ag | Multilayer, absorbent wound dressing with a hydrophilic wound contact layer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105749325A (en) * | 2016-04-11 | 2016-07-13 | 武汉海吉亚生物科技有限公司 | Medical silica gel dressing and manufacture method thereof |
| CN207024173U (en) * | 2016-11-17 | 2018-02-23 | 上海亚澳医用保健品有限公司 | A kind of novel silicon gel foam dressing |
| CN216985838U (en) * | 2022-01-04 | 2022-07-19 | 杜克有限责任公司 | Silica gel foam dressing |
| CN216985837U (en) * | 2022-01-04 | 2022-07-19 | 杜克有限责任公司 | Silica gel foam dressing |
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