WO2011126396A1 - Autraumatic nonwoven fabric (embodiments) - Google Patents

Autraumatic nonwoven fabric (embodiments) Download PDF

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Publication number
WO2011126396A1
WO2011126396A1 PCT/RU2010/000621 RU2010000621W WO2011126396A1 WO 2011126396 A1 WO2011126396 A1 WO 2011126396A1 RU 2010000621 W RU2010000621 W RU 2010000621W WO 2011126396 A1 WO2011126396 A1 WO 2011126396A1
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WO
WIPO (PCT)
Prior art keywords
atraumatic
layer
fabric according
fibers
adsorbing
Prior art date
Application number
PCT/RU2010/000621
Other languages
French (fr)
Inventor
Petr Ambartsumovich Akopov
Vladimir Nikolaevich Shkolnyy
Alexandr Mixaylovich Podluzhnyy
Original Assignee
Petr Ambartsumovich Akopov
Vladimir Nikolaevich Shkolnyy
Alexandr Mixaylovich Podluzhnyy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Petr Ambartsumovich Akopov, Vladimir Nikolaevich Shkolnyy, Alexandr Mixaylovich Podluzhnyy filed Critical Petr Ambartsumovich Akopov
Publication of WO2011126396A1 publication Critical patent/WO2011126396A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • 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
    • 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
    • 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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    • B32B23/02—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose in the form of fibres or filaments
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    • B32B23/08—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
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    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
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    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B32B7/14—Interconnection of layers using interposed adhesives or interposed materials with bonding properties applied in spaced arrangements, e.g. in stripes
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    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
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Definitions

  • This technical solution relates to the production of bandaging materials used for the coverage of wounds and improving the efficiency of wound therapy due to the combination of selective sorption for the pathogenic microflora and the atraumatic properties avoiding the adherence of the product to the wound and developing the optimum wound curing conditions.
  • Fabric (see the Big Encyclopedic Polytechnical Dictionary, Moscow, The Big Russian Encyclopedia, 1998, p. 535) is a structure formed by the interweaving of multiple threads. Fabric can be characterized, for example, by linear density or thread thickness, surface texture, density, interweaving pattern etc..
  • RU Patent 2044549 is bandage for the curing of infected wounds and for the provision of first medical aid based on mechanically bonded fibrous canvas.
  • the bandage is two-layered, wherein the sorption layer is made from antimicrobial natural and artificial fibers, and the layer contacting the wound is made from medical gauze or reticular knitted fabric based on polyester fibers or thermally bonded fabric based on polypropylene fibers.
  • Known (RU Patent 2189210) is multilayered medical bandage comprising, in sequence, a hydrophobic atraumatic permeable layer, a therapeutic layer and a polymer film layer.
  • Said bandage further comprises a protective air permeable sorption layer located above said multilayered composition, wherein said therapeutic layer and said polymer film layer comprise coaxial perforations.
  • said atraumatic permeable layer is made from a material obtained by the interweaving of fibers or by the perforation of a nonwoven material, and said therapeutic layer is in the form of medication deposited onto hydrophilic woven fabric. It can also be in the form of a biocompatible biodegradable polymer comprising immobilized medication and deposited onto hydrophilic woven fabric.
  • Said bandage can further comprise a microbial sorption layer located between said polymer film layer and said outer layer.
  • Known is an individual bandaging kit comprising a package, a bandaging kit comprising two adsorbing pillows and retaining bandage, wherein one of said pillows is rigidly attached to said retaining bandage and the other is mobile.
  • Said pillows comprise at least two layers, an atraumatic sorption one and a protective one, said retaining bandage is made from an elastic woven material, and said package comprises an outer lavsan layer, a second foil layer and an inner polyethylene layer.
  • said pillows further comprise an antimicrobial and/or a carbon layer.
  • said adsorption layer is made from nonwoven canvas-broached thyreadless absorbent fabric based on viscose, cotton or carbon fiber and impregnated with an antimicrobial material
  • said atraumatic layer is a reticular material made from woven polyester fibers or a microfibrous porous coating made from polypropylene fibers.
  • atraumatic nonwoven fabric comprising an atraumatic and an adsorbing layers, wherein said adsorbing layer is made from viscose fibers forming an unordered spatial structure with a surface density of 50 to 260 g and a thickness of 0.1 to 1 mm, and said atraumatic layer is made from polypropylene fibers forming an unordered spatial structure with a surface density of 15 to 70 g and a thickness of 0.2 to 15 mm.
  • said fiber is needle-punched with its fibrous layers being thermally bonded thereafter.
  • the object of this technical solution is to provide a new type of atraumatic nonwoven fabric avoiding the adhesion of said atraumatic nonwoven fabric to the wound and increasing the liquid sorption capacity.
  • atraumatic nonwoven fabric comprising an atraumatic and an adsorbing layers bonded to each other, wherein said atraumatic layer is made from infinite synthetic fibers nonadhesive to the wound, and said adsorbing layer is made from hydrophilic fibers, further wherein the layers are interconnected with polymer sections.
  • Said atraumatic layer can be made from thermally bonded polypropylene, polyamide, polyester, polyacrylonitrilic or biocomponent fibers or combinations thereof. The proportions of different fiber types in the combinations are arbitrary and may depend on multiple factors (fabric intended use, required thickness etc.).
  • Said adsorbing layer can be made from viscose, acetate, cotton, flax or synthetic hydrophilic fibers or combinations thereof. The proportions of different fiber types in the combinations may differ.
  • the thickness of said atraumatic layer is from 0.02 to 2 mm, and the surface density is from 5 to 100 g/m . Specific thicknesses and surface densities are determined by the intended use of atraumatic nonwoven fabric. Commonly, the thickness of said adsorbing layer is from 0.1 to 15 mm, and the surface density is from 10 to 1000 g/m . Specific thicknesses and surface densities also are determined by the intended use of atraumatic nonwoven fabric.
  • the density in the polymer melt section may be from 5 to 100 g/m , and the polymer grain size is less than 0.9 mm.
  • the layer bonding melt can be composed of polyurethane, polypropylene, polyethylene, ultrathene, polyamide or combinations thereof. Said list does not limit the range of polymers which can be used for that purpose. Efficient thermal sterilization of the material requires all the materials used be stable against thermal sterilization in accordance with the specifications of the polymer melt until the exfoliation of said atraumatic layer from said adsorbing layer or the destruction of any of the layers.
  • atraumatic nonwoven fabric developed herein comprising an atraumatic and an adsorbing layers, wherein said adsorbing layer is made from viscose fibers forming an unordered spatial structure with a surface density of 10 to 1000 g/m 2 and a thickness of 0.1 to 15 mm, and said atraumatic layer is made from polypropylene fibers forming an unordered planar structure with a surface density of 5 to 100 g/m and a thickness of 0.02 to 2 mm, the composition being as follows:
  • Polypropylene fibers 5 - 100 g/m
  • Viscose fibers 10 - 1000 g/m 2
  • said atraumatic nonwoven fabric comprises an atraumatic and an adsorbing layers, wherein said adsorbing layer is made from viscose fibers forming an unordered spatial structure with a surface density of 10 to 1000 g/m and a thickness of 0.1 to 15 mm, and said atraumatic layer is made from polypropylene fibers forming an unordered planar structure with a surface density of 5 to 100 g/m and a thickness of 0.02 to 2 mm, the composition being as follows:
  • Polypropylene fibers 5 - 100 g/m
  • Viscose fibers 10 - 1000 g/m 2
  • Said layers can be bonded using any known method, including needle punching followed by the thermal bonding of the fibrous layers using the standard technology. Furthermore, the layers can be bonded using polymer melt sections by analogy with the first embodiment of this technical solution.
  • the achievement of said technical result is provided for by the fact that the making of said atraumatic layer from polypropylene fibers forming an unordered planar structure with a surface density of 5 to 100 g/m and a thickness of 0.02 to 2 mm provides, on the one hand, for the absence of contact between said adsorbing layer and the wound surface and, on the other hand, for the free passage of liquids from the wound surface to said adsorbing layer via said atraumatic layer.
  • the use of an adsorbing layer made from viscose fibers with a surface density of 10 to 1000 g/m and a thickness of 0.1 to 15 mm is the optimum condition for the achievement of this technical result.
  • the selected proportion between the polypropylene and the viscose fibers provides for the absence of contact between said adsorbing layer and the wound surface and the free passage of liquids from the wound surface to said adsorbing layer in the final product.
  • Comparison between the specimens of atraumatic nonwoven fabric produced in accordance with the technical solution of the closest counterpart (RF Patent 90328) and the second embodiment of the technical solution developed herein showed that the force required to tear the fabric specimen from the wound is reduced by approx. 32%, and the liquid adsorption is increased by approx. 17%.
  • the atraumatic nonwoven fabric developed herein can be covered with ointment or a medication solution.
  • the atraumatic nonwoven fabric developed herein is made using the needle punching and thermal bonding technologies followed by the thermal bonding of the fibrous layers. Commonly, the needle punching density is 20 to 300 punches per 1 cm of fabric. The fibrous layers required additional bonding by calendering.
  • the atraumatic nonwoven fabric according to both embodiments is intended for application to wounds during first medical aid, for bandaging of wounds, cuts and burns and for autoplasty.
  • the atraumatic nonwoven fabric can be used individually or in combination with other bandaging materials.
  • the atraumatic nonwoven fabric according to both embodiments comprises an atraumatic and an adsorbing layers.
  • the fabric is made from the following raw materials:
  • the atraumatic nonwoven fabric is made from thermally bonded polypropylene, polyamide, polyester, polyacrylonitrilic or biocomponent fibers or combinations thereof (the atraumatic layer) and viscose, acetate, cotton, flax or synthetic hydrophilic fibers or combinations thereof (the adsorbing layer).
  • the layers are bonded using a point-sized polymer melt section.
  • the polymer is applied to any of the bonded layers by pouring, sputtering, transport to a heated surface or by any other suitable method.
  • the adhesive properties are imparted to the polymer using temperature, infrared radiation or any other known method, preferably, by partial melting.
  • the second layer is applied to the layer with adhesive polymer, and the layers and calendered.
  • the atraumatic layer comprises infinite polypropylene fibers produced by extrusion followed by thermal bonding to achieve a surface density of 15 g/m .
  • the hydrophilic layer comprises stapled viscose fibers formed by needle punching into a fabric with a surface density of 100 g/m .
  • the layers are bonded with ethylene and vinylacetate copolymer melt sections 20 g/m in weight and with grain sizes of 200-400 ⁇ .
  • the resultant atraumatic nonwoven fabric has high air permeability and adsorption capacity. Unlike gauze products, it has no adhesion to the wound surface and does not damage adjacent tissues during removal thus avoiding patients' painful sensations during bandaging and improves the granulation processes in the wound.
  • this atraumatic nonwoven fabric allows: a) avoiding the adhesion of the ends of stapled polypropylene fibers to wound tissues due to the use of infinite fibers; b) reducing the thickness of the atraumatic layer while retaining (or possibly increasing) air permeability due to the use of polymer melt glue; c) avoiding the penentration of fibers absorbent layer into the atraumatic layer thus also reducing the adhesion to the wound surface and reducing painful sensations.
  • the fabric requires sterilization at within 70°C.
  • the atraumatic nonwoven fabric is made from viscose fibers forming an unordered spatial structure (the adsorbing layer) and polypropylene fibers (the atraumatic layer).
  • the layers are preferably bonded using the needle punching and thermal bonding technologies followed by the thermal bonding of the fibrous layers using the standard technology.
  • the adsorbing viscose layer has a surface density of 100 g/m 2
  • the atraumatic polypropylene layer has a surface density of 30 g/m
  • the layers are produced simultaneously on the same equipment by needle punching followed by the thermal bonding of the polypropylene fibers.

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Abstract

This technical solution relates to the production of bandaging materials used for the coverage of wounds and improving the efficiency of wound therapy due to the combination of selective sorption for the pathogenic microflora and the atraumatic properties avoiding the adherence of the product to the wound and developing the optimum wound curing conditions.

Description

Autraumatic Nonwoven Fabric (Embodiments)
This technical solution relates to the production of bandaging materials used for the coverage of wounds and improving the efficiency of wound therapy due to the combination of selective sorption for the pathogenic microflora and the atraumatic properties avoiding the adherence of the product to the wound and developing the optimum wound curing conditions.
Fabric (see the Big Encyclopedic Polytechnical Dictionary, Moscow, The Big Russian Encyclopedia, 1998, p. 535) is a structure formed by the interweaving of multiple threads. Fabric can be characterized, for example, by linear density or thread thickness, surface texture, density, interweaving pattern etc..
Known (RU Patent 2044549) is bandage for the curing of infected wounds and for the provision of first medical aid based on mechanically bonded fibrous canvas. The bandage is two-layered, wherein the sorption layer is made from antimicrobial natural and artificial fibers, and the layer contacting the wound is made from medical gauze or reticular knitted fabric based on polyester fibers or thermally bonded fabric based on polypropylene fibers.
Disadvantage of said known bandage is its adhesion to the wound combined with relatively low bandaging properties.
Known (RU Patent 2189210) is multilayered medical bandage comprising, in sequence, a hydrophobic atraumatic permeable layer, a therapeutic layer and a polymer film layer. Said bandage further comprises a protective air permeable sorption layer located above said multilayered composition, wherein said therapeutic layer and said polymer film layer comprise coaxial perforations. In the preferred embodiment, said atraumatic permeable layer is made from a material obtained by the interweaving of fibers or by the perforation of a nonwoven material, and said therapeutic layer is in the form of medication deposited onto hydrophilic woven fabric. It can also be in the form of a biocompatible biodegradable polymer comprising immobilized medication and deposited onto hydrophilic woven fabric. Said bandage can further comprise a microbial sorption layer located between said polymer film layer and said outer layer.
Disadvantage of said bandage is its complex structure resulting in high cost.
Known (RU Patent 2164150) is an individual bandaging kit comprising a package, a bandaging kit comprising two adsorbing pillows and retaining bandage, wherein one of said pillows is rigidly attached to said retaining bandage and the other is mobile. Said pillows comprise at least two layers, an atraumatic sorption one and a protective one, said retaining bandage is made from an elastic woven material, and said package comprises an outer lavsan layer, a second foil layer and an inner polyethylene layer. Preferably, said pillows further comprise an antimicrobial and/or a carbon layer. In the most preferred embodiment, said adsorption layer is made from nonwoven canvas-broached thyreadless absorbent fabric based on viscose, cotton or carbon fiber and impregnated with an antimicrobial material, said atraumatic layer is a reticular material made from woven polyester fibers or a microfibrous porous coating made from polypropylene fibers.
Disadvantage of said bandage are its low properties due to an unbalanced composition of the threads which form it.
The closest counterpart of the fabric disclosed herein is (RU Patent 90328) atraumatic nonwoven fabric comprising an atraumatic and an adsorbing layers, wherein said adsorbing layer is made from viscose fibers forming an unordered spatial structure with a surface density of 50 to 260 g and a thickness of 0.1 to 1 mm, and said atraumatic layer is made from polypropylene fibers forming an unordered spatial structure with a surface density of 15 to 70 g and a thickness of 0.2 to 15 mm. Preferably said fiber is needle-punched with its fibrous layers being thermally bonded thereafter.
Disadvantage of said atraumatic nonwoven fabric is its possible adhesion to the wound and insufficient sorption capacity.
The object of this technical solution is to provide a new type of atraumatic nonwoven fabric avoiding the adhesion of said atraumatic nonwoven fabric to the wound and increasing the liquid sorption capacity.
In accordance with the first embodiment of this invention, it is suggested to achieve said technical result using atraumatic nonwoven fabric comprising an atraumatic and an adsorbing layers bonded to each other, wherein said atraumatic layer is made from infinite synthetic fibers nonadhesive to the wound, and said adsorbing layer is made from hydrophilic fibers, further wherein the layers are interconnected with polymer sections. Said atraumatic layer can be made from thermally bonded polypropylene, polyamide, polyester, polyacrylonitrilic or biocomponent fibers or combinations thereof. The proportions of different fiber types in the combinations are arbitrary and may depend on multiple factors (fabric intended use, required thickness etc.). Said adsorbing layer can be made from viscose, acetate, cotton, flax or synthetic hydrophilic fibers or combinations thereof. The proportions of different fiber types in the combinations may differ. Commonly, the thickness of said atraumatic layer is from 0.02 to 2 mm, and the surface density is from 5 to 100 g/m . Specific thicknesses and surface densities are determined by the intended use of atraumatic nonwoven fabric. Commonly, the thickness of said adsorbing layer is from 0.1 to 15 mm, and the surface density is from 10 to 1000 g/m . Specific thicknesses and surface densities also are determined by the intended use of atraumatic nonwoven fabric. The density in the polymer melt section may be from 5 to 100 g/m , and the polymer grain size is less than 0.9 mm. The layer bonding melt can be composed of polyurethane, polypropylene, polyethylene, ultrathene, polyamide or combinations thereof. Said list does not limit the range of polymers which can be used for that purpose. Efficient thermal sterilization of the material requires all the materials used be stable against thermal sterilization in accordance with the specifications of the polymer melt until the exfoliation of said atraumatic layer from said adsorbing layer or the destruction of any of the layers. The achievement of said technical result in accordance with the first embodiment of this invention (avoiding the adhesion of said atraumatic nonwoven fabric to the wound with an increase in the liquid sorption capacity) is provided for by the use of the structure developed herein. The making of said atraumatic layer from synthetic fibers nonadhesive to the wound avoids the adhesion of said atraumatic nonwoven fabric to the wound. The making of said adsorbing layer from hydrophilic fibers provides for liquid adsorption. The presence of polymer sections which only partially screen said adsorbing layer from the wound surface but provide for the bonding of said atraumatic layer and said adsorbing layer results in a large interaction area between the wound surface and said adsorbing layer. Comparison between the specimens of atraumatic nonwoven fabric produced in accordance with the technical solution of the closest counterpart (RF Patent 90328) and the technical solution developed herein showed that the force required to tear the fabric specimen from the wound is reduced by approx. 34%, and the liquid adsorption is increased by approx. 19%. An additional technical result achieved by using the atraumatic nonwoven fabric disclosed herein is the higher mechanical strength of layer bonding which almost completely eliminates the possibility of adsorbing layer breakage from said atraumatic layer during bandage removal.
Said technical result can also be achieved by using the atraumatic nonwoven fabric developed herein comprising an atraumatic and an adsorbing layers, wherein said adsorbing layer is made from viscose fibers forming an unordered spatial structure with a surface density of 10 to 1000 g/m2 and a thickness of 0.1 to 15 mm, and said atraumatic layer is made from polypropylene fibers forming an unordered planar structure with a surface density of 5 to 100 g/m and a thickness of 0.02 to 2 mm, the composition being as follows:
Polypropylene fibers: 5 - 100 g/m
Viscose fibers: 10 - 1000 g/m2
The achievement of said technical result in accordance with the second embodiment of this invention (avoiding the adhesion of said atraumatic nonwoven fabric to the wound with an increase in the liquid sorption capacity) is provided for by the use of the structure developed herein. In accordance with the second embodiment of this technical solution, said atraumatic nonwoven fabric comprises an atraumatic and an adsorbing layers, wherein said adsorbing layer is made from viscose fibers forming an unordered spatial structure with a surface density of 10 to 1000 g/m and a thickness of 0.1 to 15 mm, and said atraumatic layer is made from polypropylene fibers forming an unordered planar structure with a surface density of 5 to 100 g/m and a thickness of 0.02 to 2 mm, the composition being as follows:
Polypropylene fibers: 5 - 100 g/m
Viscose fibers: 10 - 1000 g/m2
Said layers can be bonded using any known method, including needle punching followed by the thermal bonding of the fibrous layers using the standard technology. Furthermore, the layers can be bonded using polymer melt sections by analogy with the first embodiment of this technical solution. The achievement of said technical result is provided for by the fact that the making of said atraumatic layer from polypropylene fibers forming an unordered planar structure with a surface density of 5 to 100 g/m and a thickness of 0.02 to 2 mm provides, on the one hand, for the absence of contact between said adsorbing layer and the wound surface and, on the other hand, for the free passage of liquids from the wound surface to said adsorbing layer via said atraumatic layer. It is the use of an unordered planar structure of polypropylene fibers with the abovementioned quantitative parameters that provides for the absence of contact between said adsorbing layer and the wound surface and the free passage of liquids from the wound surface to said adsorbing layer. According to the Applicant, the abovementioned quantitative parameters of said atraumatic layer have been experimentally determined to be the optimum ones for this technical result. The use of an adsorbing layer made from viscose fibers forming an unordered spatial structure provides for the maximum sorption capacity due to the resultant capillary effect retaining the moisture between the fibers. According to the Applicant's experimental data, the use of an adsorbing layer made from viscose fibers with a surface density of 10 to 1000 g/m and a thickness of 0.1 to 15 mm is the optimum condition for the achievement of this technical result. The selected proportion between the polypropylene and the viscose fibers provides for the absence of contact between said adsorbing layer and the wound surface and the free passage of liquids from the wound surface to said adsorbing layer in the final product. Comparison between the specimens of atraumatic nonwoven fabric produced in accordance with the technical solution of the closest counterpart (RF Patent 90328) and the second embodiment of the technical solution developed herein showed that the force required to tear the fabric specimen from the wound is reduced by approx. 32%, and the liquid adsorption is increased by approx. 17%.
The atraumatic nonwoven fabric developed herein can be covered with ointment or a medication solution. The atraumatic nonwoven fabric developed herein is made using the needle punching and thermal bonding technologies followed by the thermal bonding of the fibrous layers. Commonly, the needle punching density is 20 to 300 punches per 1 cm of fabric. The fibrous layers required additional bonding by calendering.
The atraumatic nonwoven fabric according to both embodiments is intended for application to wounds during first medical aid, for bandaging of wounds, cuts and burns and for autoplasty. The atraumatic nonwoven fabric can be used individually or in combination with other bandaging materials.
The atraumatic nonwoven fabric according to both embodiments comprises an atraumatic and an adsorbing layers.
The fabric is made from the following raw materials:
In accordance with the first embodiment, the atraumatic nonwoven fabric is made from thermally bonded polypropylene, polyamide, polyester, polyacrylonitrilic or biocomponent fibers or combinations thereof (the atraumatic layer) and viscose, acetate, cotton, flax or synthetic hydrophilic fibers or combinations thereof (the adsorbing layer).
In accordance with the first embodiment, the layers are bonded using a point-sized polymer melt section. The polymer is applied to any of the bonded layers by pouring, sputtering, transport to a heated surface or by any other suitable method. The adhesive properties are imparted to the polymer using temperature, infrared radiation or any other known method, preferably, by partial melting. Following that the second layer is applied to the layer with adhesive polymer, and the layers and calendered.
The embodiment of the technical solution developed herein is illustrated with the example below.
The atraumatic layer comprises infinite polypropylene fibers produced by extrusion followed by thermal bonding to achieve a surface density of 15 g/m . The hydrophilic layer comprises stapled viscose fibers formed by needle punching into a fabric with a surface density of 100 g/m . The layers are bonded with ethylene and vinylacetate copolymer melt sections 20 g/m in weight and with grain sizes of 200-400 μπι.
The resultant atraumatic nonwoven fabric has high air permeability and adsorption capacity. Unlike gauze products, it has no adhesion to the wound surface and does not damage adjacent tissues during removal thus avoiding patients' painful sensations during bandaging and improves the granulation processes in the wound.
Unlike the closest counterpart atraumatic nonwoven fabric, this atraumatic nonwoven fabric allows: a) avoiding the adhesion of the ends of stapled polypropylene fibers to wound tissues due to the use of infinite fibers; b) reducing the thickness of the atraumatic layer while retaining (or possibly increasing) air permeability due to the use of polymer melt glue; c) avoiding the penentration of fibers absorbent layer into the atraumatic layer thus also reducing the adhesion to the wound surface and reducing painful sensations.
The fabric requires sterilization at within 70°C.
In accordance with the second embodiment, the atraumatic nonwoven fabric is made from viscose fibers forming an unordered spatial structure (the adsorbing layer) and polypropylene fibers (the atraumatic layer).
The layers are preferably bonded using the needle punching and thermal bonding technologies followed by the thermal bonding of the fibrous layers using the standard technology.
Below is an example of the atraumatic nonwoven fabric developed herein. The adsorbing viscose layer has a surface density of 100 g/m2, the atraumatic polypropylene layer has a surface density of 30 g/m , and the layers are produced simultaneously on the same equipment by needle punching followed by the thermal bonding of the polypropylene fibers.
The advantages of this fabric are the simple technology and the low production cost.

Claims

What is claimed is
1. Atraumatic nonwoven fabric comprising an atraumatic and an adsorbing layers bonded to each other, wherein said atraumatic layer is made from synthetic fibers nonadhesive to the wound, and said adsorbing layer is made from hydrophilic fibers, further wherein the layers are interconnected with polymer sections.
2. Fabric according to Claim 1, wherein said atraumatic layer is made from thermally bonded polypropylene, polyamide, polyester, polyacrylonitrilic or biocomponent fibers or combinations thereof.
3. Fabric according to Claim 1, wherein said adsorbing layer is made from viscose, acetate, cotton, flax or synthetic hydrophilic fibers or combinations thereof.
4. Fabric according to Claim 1, wherein the thickness of said atraumatic layer is 0.02 to 2 mm, and the surface density is from 5 to 100 g/m2.
5. Fabric according to Claim 1, wherein the thickness of said adsorbing layer is 0.1 to 15 mm, and the surface density is from 10 to 1000 g/m2.
6. Fabric according to Claim 1, wherein the density in the polymer melt section may be from 5 to 100 g/m ,and the polymer grain size is less than 0.9 mm.
7. Fabric according to Claim 1, wherein said polymer is polyurethane, polypropylene, polyethylene, ultrathene, polyamide, other polymers or combinations thereof.
8. Fabric according to Claim 1, wherein the materials used therein are stable against thermal sterilization in accordance with the specifications of the polymer until the exfoliation of said atraumatic layer from said adsorbing layer or the destruction of any of the layers.
9. Atraumatic nonwoven fabric comprising an atraumatic and an adsorbing layers, wherein said adsorbing layer is made from viscose fibers forming an unordered spatial structure with a surface density of 10 to 1000 g/m and a thickness of 0.1 to 15 mm, and said atraumatic layer is made from polypropylene fibers forming an unordered planar structure with a surface density of 5 to 100 g/m and a thickness of 0.02 to 2 mm, the composition being as follows:
Polypropylene fibers: 5 - 100 g/m
Viscose fibers: 10 - 1000 g/m2
10. Fabric according to Claim 9, wherein said atraumatic layer is covered with ointment or a medication solution.
11. Fabric according to Claim 9, wherein said fabric is produced using the needle punching and thermal bonding technologies followed by the thermal bonding of the fibrous layers.
12. Fabric according to Claim 1 1, wherein the needle punching density is 20 to 300 punches per 1 cm of fabric.
13. Fabric according to Claim 9, wherein said fibrous layers are further bonded by calendering.
PCT/RU2010/000621 2010-04-08 2010-10-25 Autraumatic nonwoven fabric (embodiments) WO2011126396A1 (en)

Applications Claiming Priority (2)

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RU2010113615 2010-04-08

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000071789A1 (en) * 1999-05-21 2000-11-30 3M Innovative Properties Company Hydrophilic polypropylene fibers having antimicrobial activity
WO2003051412A1 (en) * 2001-12-14 2003-06-26 Kimberly-Clark Worldwide, Inc. Absorbent materials having improved absorbent properties
RU2242370C2 (en) * 2002-09-27 2004-12-20 Открытое акционерное общество "Научно-исследовательский институт нетканых материалов" Composite material for absorbing articles
RU90328U1 (en) * 2009-05-20 2010-01-10 Пётр Амбарцумович Акопов FABRIC NONWOVEN ATRAUMATIC

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000071789A1 (en) * 1999-05-21 2000-11-30 3M Innovative Properties Company Hydrophilic polypropylene fibers having antimicrobial activity
WO2003051412A1 (en) * 2001-12-14 2003-06-26 Kimberly-Clark Worldwide, Inc. Absorbent materials having improved absorbent properties
RU2242370C2 (en) * 2002-09-27 2004-12-20 Открытое акционерное общество "Научно-исследовательский институт нетканых материалов" Composite material for absorbing articles
RU90328U1 (en) * 2009-05-20 2010-01-10 Пётр Амбарцумович Акопов FABRIC NONWOVEN ATRAUMATIC

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