WO2016086243A1 - Wound dressing - Google Patents

Wound dressing Download PDF

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Publication number
WO2016086243A1
WO2016086243A1 PCT/ZA2015/050026 ZA2015050026W WO2016086243A1 WO 2016086243 A1 WO2016086243 A1 WO 2016086243A1 ZA 2015050026 W ZA2015050026 W ZA 2015050026W WO 2016086243 A1 WO2016086243 A1 WO 2016086243A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
wound dressing
absorbent
viscose
polyester
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/ZA2015/050026
Other languages
French (fr)
Inventor
Jacob Frederick MOUTON
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP15862443.7A priority Critical patent/EP3223761B1/en
Priority to US15/528,895 priority patent/US10682434B2/en
Priority to CN201580069906.1A priority patent/CN107223043B/en
Priority to CA2968877A priority patent/CA2968877C/en
Priority to JP2017545885A priority patent/JP6728207B2/en
Priority to NZ732625A priority patent/NZ732625B2/en
Priority to ES15862443T priority patent/ES2842961T3/en
Priority to AU2015353395A priority patent/AU2015353395B2/en
Publication of WO2016086243A1 publication Critical patent/WO2016086243A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D04H1/43835—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
    • 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
    • A61L15/46—Deodorants or malodour counteractants, e.g. to inhibit the formation of ammonia or bacteria
    • 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
    • A61F13/00051—Accessories for dressings
    • A61F13/00063—Accessories for dressings comprising medicaments or additives, e.g. odor control, PH control, debriding, antimicrobic
    • 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
    • A61F13/01—Non-adhesive bandages or dressings
    • A61F13/01008—Non-adhesive bandages or dressings characterised by the material
    • 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
    • A61F13/01—Non-adhesive bandages or dressings
    • A61F13/01034—Non-adhesive bandages or dressings characterised by a property
    • A61F13/01042—Absorbency
    • 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
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • D04H1/4258—Regenerated cellulose series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4266—Natural fibres not provided for in group D04H1/425
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/498—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres entanglement of layered webs
    • 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
    • A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
    • A61L2300/40—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a specific therapeutic activity or mode of action
    • A61L2300/404—Biocides, antimicrobial agents, antiseptic agents

Definitions

  • This invention relates to wound dressings.
  • Healing is optimized if the wound bed is healthy. It is therefore an object of the invention to provide a dressing which assists the body with the healing process, by preparing the wound bed for healing.
  • An absorbent dressing is very important to absorb body fluid and keep it away from the wound bed, preventing maceration and over granulation.
  • the dressing materials should also assist with the draining of oedem from the wound bed which reduces swelling and improves blood supply to the wound bed.
  • a wound dressing which includes a 1 to 12 mm thick layer of absorbent non-woven fibre material of between 150 and 1200 grams per square meter, which layer includes a mixture of viscose fibres and polyester fibres with more viscose than polyester, and of which the linear density of the viscose is between 1 .5 and 3 decitex (dtex) and the linear density of the polyester is between 2 and 3 dtex.
  • Dtex is grams per 10,000 meters of fibre.
  • the layer of absorbent non-woven fibre material may comprise two or more thinner layers of absorbent non-woven material needle punched together to form the single layer.
  • the absorbent layer may preferably also include between 7 and 25 % chitin fibres mixed or interwoven with the viscose and polyester fibres with the chitin fibres having a linear density between 1 .5 and 2.5 dtex.
  • One or both sides of the layer of absorbent material may be covered by a non-adherent layer.
  • the non-adherent layer or layers may be heat bonded / laminated to the absorbent layer.
  • the non-adherent layer may be a thin film of polyurethane or a HDPE based material such as CM18 produced by Smith & Nephew.
  • the composite density may be between 150 and 1200 grams per square meter (gsm), preferably about 700 - 750 gsm.
  • the polyester fibre length may be between about 30 and 70mm, preferably about 50mm.
  • the viscose fibre length may be between about 20 and 60mm, preferably about 40mm.
  • the chitin fibre length may be between about 30 and 70mm, preferably about 60mm.
  • the punching density may be between 250 and to 380 punches per square centimetre, preferably about 320.
  • the construction of the dressing makes the material "super absorbent" with a "pass - on” effect from one dressing to another.
  • the composition of the dressing also secures the exudates inside the dressing without “fall back” or “dripping” of exudates back onto the wound bed. This prevents the damaging of healthy surrounding skin.
  • This dressing helps to reduce swelling and the restoration of the bacterial balance in the deeper compartments of the wound bed.
  • This "pass - on” effect prevents colonization and duplication of bacteria.
  • the antimicrobial fiber that forms part of the composition is very important in controlling bacterial levels on the wound bed, which helps to keep the wound bed healthy.
  • the dressing also has a non-adherent film layer that help to protect the healthy wound bed.
  • This film dressing is suitable on all type of wounds especially burns. Superficial healthy wounds with low volumes of exudates may be dressed with the film layer dressing.
  • the film layer does not interfere with the healing process but rather protects the wound bed from any adherence by the dressing. New granulation tissue will not be harmed or damaged.
  • the film may preferably breathable and of HDPE or polyurethane.
  • Examples 1 and 2 with about 10x by weight absorbency capacity, in accordance with the invention, is a wound dressing, which includes a ⁇ 3 - 5 mm thick layer of absorbent non-woven fibre material of ⁇ 700 - 750 grams per square meter, which layer includes a mixture of 70% viscose fibres and 30% polyester fibres.
  • Example 3 with about 10x by weight absorbency capacity, according to the invention there is provided a wound dressing, which includes the absorbent layer of the wound dressing described in Examples 1 and 2, which includes a non-adherent layer on both sides of the layer of absorbent material.
  • the non- adherent layers are heat bonded / laminated to the absorbent layer.
  • Example 4 includes two absorbent layers which are needle punched together to form one thick absorbent layer as described in Examples 1 and 2.
  • Example 5 includes the absorbent layer as described in Example 4, which includes a non-adherent layer on both sides of the layer of absorbent material. The non-adherent layers are heat bonded / laminated to the absorbent layer.
  • Examples 6 to 9 is similar to and corresponds with examples 1 to 4 wherein the viscose is 55%, the polyester is 35% and includes 10% chitin fibres.
  • the wound dressing absorbs fluids about 10x its own weight by means of adhesion and cohesion forces as well as electrostatic forces to draw out of the wound solid wound material and fluids vertically and to spread it horizontally in the absorbent layer.
  • the wound material includes harmful bacteria.
  • the wound dressing actively and continuously removes unwanted material from the wound until absorbent capacity is reached keeping the wound clear allowing the wound to heal faster than without the wound dressing.
  • the chitin fibres also provide an antimicrobial function.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Mechanical Engineering (AREA)
  • Epidemiology (AREA)
  • Materials Engineering (AREA)
  • Hematology (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials For Medical Uses (AREA)
  • Laminated Bodies (AREA)
  • Medicinal Preparation (AREA)

Abstract

The invention provides a wound dressing, which includes a 1 to 12 mm thick layer of absorbent non-woven fibre material between 150 and 1200 grams per square meter, which layer includes a mixture of viscose fibres and polyester fibres which more viscose than polyester, and of which the fines of the viscose is between 1,5 and 3 dtex and the fines of the polyester is between 2 and 3 dtex.

Description

Title: Wound Dressing
Technical field of the invention
This invention relates to wound dressings.
Background to the invention The inventor is aware of the need for a wound dressing, which not only cover and protect the wound but create a healthy wound bed that is well vascularised. The reconstruction of the wound bed is of utmost importance. By this the inventor means to remove barriers and obstructions that prevent or delays wound healing.
Healing is optimized if the wound bed is healthy. It is therefore an object of the invention to provide a dressing which assists the body with the healing process, by preparing the wound bed for healing. An absorbent dressing is very important to absorb body fluid and keep it away from the wound bed, preventing maceration and over granulation.
Breaking down of slough and necrotic tissue improves wound healing, but also increases the volumes of exudates. This must be monitored carefully to prevent damage to healthy skin. Preferably, the dressing materials should also assist with the draining of oedem from the wound bed which reduces swelling and improves blood supply to the wound bed.
It is an object of the invention to provide a highly absorbent wound dressing, which actively assists with the healing process of a wound, in use.
General description of the invention
According to the invention there is provided a wound dressing, which includes a 1 to 12 mm thick layer of absorbent non-woven fibre material of between 150 and 1200 grams per square meter, which layer includes a mixture of viscose fibres and polyester fibres with more viscose than polyester, and of which the linear density of the viscose is between 1 .5 and 3 decitex (dtex) and the linear density of the polyester is between 2 and 3 dtex. Dtex is grams per 10,000 meters of fibre.
The layer of absorbent non-woven fibre material may comprise two or more thinner layers of absorbent non-woven material needle punched together to form the single layer.
The absorbent layer may preferably also include between 7 and 25 % chitin fibres mixed or interwoven with the viscose and polyester fibres with the chitin fibres having a linear density between 1 .5 and 2.5 dtex. One or both sides of the layer of absorbent material may be covered by a non-adherent layer. The non-adherent layer or layers may be heat bonded / laminated to the absorbent layer. The non-adherent layer may be a thin film of polyurethane or a HDPE based material such as CM18 produced by Smith & Nephew.
The composite density may be between 150 and 1200 grams per square meter (gsm), preferably about 700 - 750 gsm.
The polyester fibre length may be between about 30 and 70mm, preferably about 50mm.
The viscose fibre length may be between about 20 and 60mm, preferably about 40mm. The chitin fibre length may be between about 30 and 70mm, preferably about 60mm. In the case where two layers are needle punched together to form one layer, the punching density may be between 250 and to 380 punches per square centimetre, preferably about 320.
The construction of the dressing makes the material "super absorbent" with a "pass - on" effect from one dressing to another. The composition of the dressing also secures the exudates inside the dressing without "fall back" or "dripping" of exudates back onto the wound bed. This prevents the damaging of healthy surrounding skin. This dressing helps to reduce swelling and the restoration of the bacterial balance in the deeper compartments of the wound bed. This "pass - on" effect prevents colonization and duplication of bacteria. The antimicrobial fiber that forms part of the composition is very important in controlling bacterial levels on the wound bed, which helps to keep the wound bed healthy.
Some embodiments of the dressing also has a non-adherent film layer that help to protect the healthy wound bed. This film dressing is suitable on all type of wounds especially burns. Superficial healthy wounds with low volumes of exudates may be dressed with the film layer dressing. The film layer does not interfere with the healing process but rather protects the wound bed from any adherence by the dressing. New granulation tissue will not be harmed or damaged. The film may preferably breathable and of HDPE or polyurethane. Detailed description of the invention
The invention is now described by way of examples.
Examples 1 and 2, with about 10x by weight absorbency capacity, in accordance with the invention, is a wound dressing, which includes a ± 3 - 5 mm thick layer of absorbent non-woven fibre material of ± 700 - 750 grams per square meter, which layer includes a mixture of 70% viscose fibres and 30% polyester fibres. Product Specification:
Example 1 Example 2
Figure imgf000005_0001
Example 3, with about 10x by weight absorbency capacity, according to the invention there is provided a wound dressing, which includes the absorbent layer of the wound dressing described in Examples 1 and 2, which includes a non-adherent layer on both sides of the layer of absorbent material. The non- adherent layers are heat bonded / laminated to the absorbent layer.
Example 4 includes two absorbent layers which are needle punched together to form one thick absorbent layer as described in Examples 1 and 2. Example 5 includes the absorbent layer as described in Example 4, which includes a non-adherent layer on both sides of the layer of absorbent material. The non-adherent layers are heat bonded / laminated to the absorbent layer. Examples 6 to 9 is similar to and corresponds with examples 1 to 4 wherein the viscose is 55%, the polyester is 35% and includes 10% chitin fibres.
Further examples include a wound dressing similar to examples 1 to 9 with the single layer being 200gsm and about 1 mm thick or being 600gsm and about 3mm thick.
The applicant has found that the wound dressing absorbs fluids about 10x its own weight by means of adhesion and cohesion forces as well as electrostatic forces to draw out of the wound solid wound material and fluids vertically and to spread it horizontally in the absorbent layer. The wound material includes harmful bacteria. The wound dressing actively and continuously removes unwanted material from the wound until absorbent capacity is reached keeping the wound clear allowing the wound to heal faster than without the wound dressing. In addition, the chitin fibres also provide an antimicrobial function.
It shall be understood that the examples are provided for illustrating the invention further and to assist a person skilled in the art with understanding the invention and are not meant to be construed as unduly limiting the reasonable scope of the invention.

Claims

1 . A wound dressing, which includes a 1 to 12 mm thick layer of absorbent non-woven fibre material of between 150 and 1200 grams per square meter, which layer includes a mixture of viscose fibres and polyester fibres with more viscose than polyester, and of which the linear density of the viscose is between 1 .5 and 3 dtex and the linear density of the polyester is between 2 and 3 dtex.
2. A wound dressing as claimed in Claim 1 , wherein the layer of absorbent non-woven fibre material comprises two or more thinner layers of absorbent non-woven material needle punched together to form the single layer.
3. A wound dressing as claimed in Claim 1 or Claim 2, wherein the absorbent layer also includes between 7 and 25 % chitin fibres mixed or interwoven with the viscose and polyester fibres with the chitin fibres having a linear density between 1 .5 and 2.5 dtex.
4. A wound dressing as claimed in any one of claims 1 to 3, wherein one or both sides of the layer of absorbent material are covered by a nonadherent layer.
5. A wound dressing as claimed in Claim 4, wherein the non-adherent layer or layers are heat bonded / laminated to the absorbent layer.
6. A wound dressing as claimed in Claim 5, wherein the non-adherent layer or layers are selected from a thin polyurethane or HDPE film.
7. A wound dressing as claimed in any one of claims 1 to 6, wherein the composite density is between 150 and 1000 grams per square meter.
8. A wound dressing as claimed in any one of claims 1 to 7, wherein the polyester fibre length is between about 30 and 70mm.
9. A wound dressing as claimed in any one of claims 1 to 8, wherein the viscose fibre length is between about 20 and 60mm.
10. A wound dressing as claimed in any one of claims 3 to 9, wherein the chitin fibre length is between 30 and 70mm.
PCT/ZA2015/050026 2014-11-24 2015-11-24 Wound dressing Ceased WO2016086243A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP15862443.7A EP3223761B1 (en) 2014-11-24 2015-11-24 Wound dressing
US15/528,895 US10682434B2 (en) 2014-11-24 2015-11-24 Wound dressing
CN201580069906.1A CN107223043B (en) 2014-11-24 2015-11-24 wound dressing
CA2968877A CA2968877C (en) 2014-11-24 2015-11-24 Wound dressing
JP2017545885A JP6728207B2 (en) 2014-11-24 2015-11-24 Wound dressing
NZ732625A NZ732625B2 (en) 2014-11-24 2015-11-24 Wound dressing
ES15862443T ES2842961T3 (en) 2014-11-24 2015-11-24 Wound dressing
AU2015353395A AU2015353395B2 (en) 2014-11-24 2015-11-24 Wound dressing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1420862.3 2014-11-24
GBGB1420862.3A GB201420862D0 (en) 2014-11-24 2014-11-24 Wound dressing

Publications (1)

Publication Number Publication Date
WO2016086243A1 true WO2016086243A1 (en) 2016-06-02

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GB201712165D0 (en) * 2017-07-28 2017-09-13 Smith & Nephew Wound dressing and method of manufacture
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WO2025208195A1 (en) * 2024-04-03 2025-10-09 Cid Renan Constructive arrangement applied to dressings for curative, medical, surgical and the like procedures

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US20170326267A1 (en) 2017-11-16
ES2842961T3 (en) 2021-07-15
CA2968877A1 (en) 2016-06-02
AU2015353395B2 (en) 2020-05-28
JP2017536956A (en) 2017-12-14
CA2968877C (en) 2022-07-19
AU2015353395A1 (en) 2017-07-13
EP3223761A1 (en) 2017-10-04
CN107223043A (en) 2017-09-29
EP3223761A4 (en) 2018-04-25
US10682434B2 (en) 2020-06-16
CN107223043B (en) 2020-12-29
GB201420862D0 (en) 2015-01-07
NZ732625A (en) 2021-08-27
EP3223761B1 (en) 2020-10-14
JP6728207B2 (en) 2020-07-22

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