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EP0099758A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Composite wound dressing

Assignee: University of Strathclyde
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Filing: 1983-07-20
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Granted: —
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Expires: 2003-07-20
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Abstract

Abstract The multilayered composite wound dressing comprises of a semipermeable membrane, a permeable supporting and reinforcing layer, and a non-stick, self-sealing biodegradable tissue interface. The semipermeable membrane may be a synthetic collagen, an alginate or a biocompatible polymer and it controls the rate of water vapour transmission from the wound surface. The permeable supporting and reinforcing layer provides mechanical strength and is usually a textile fabric which may also be made electrically conductive by coating it with a carbon-doped silicon or natural rubber or depositing metal on the fabric. Alternatively, an activated carbon cloth fabric can also be used. The biodegradable tissue interface may be synthetic collagen, sodium-calcium alginate or collagen-alginate complex, and it provides non-stick haemostatic sealing and aids the wound repair processes. For topical medication, growth promoting, antibacterial, anti-allergic and therapeutic agents may also be incorporated. Any combination of each of the materials suitable for a particular layer can be used for a specific application. The conductive supporting and reinforcing layer can be used to provide electrical charge transfer and stimulation of the wound using external fields which has been shown to enhance the wound healing process, produce post-operative pain relief and bacterial-inhibition. The composite wound dressing has application inter alia in treating general surgical wounds, burns, bedsores, infected ulcers, donor sites for skin grafts or alternatively can be used for electrode dressing in transcutaneous and functional stimulation.

Inventors

  • 👤 Laszlo Dr. Juhasz

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-25 01:59
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/20; A61N1/205; A61F; A61F13/00; A61F13/01; A61F13/01008; A61F13/01012; A61F13/15; A61F13/51; A61F13/511; A61F13/51121; A61K; A61K9/00; A61K9/70; A61K9/7023; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/24; A61L15/26; A61L15/28; A61L15/32; A61L15/325; A61F13/06; A61F13/064; A61F13/069; A61F13/53; A61F13/534; A61F13/84; A61F13/8405; A61F2013/00089; A61F2013/00157; A61F2013/00217; A61F2013/00221; A61F2013/00229; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F2013/15008; A61F2013/15024; A61F2013/15048; A61F2013/53445

Claims Analysis

Total Claims: 24
Claim 1
Independent Claim 39 words
A composite wound dressing comprising in a layered arrangement, a semipermeable membrane, a supporting and reinforcing permeable layer, and a non-stick, self-sealing biodegradable tissue interface, said permeable layer being located between the semipermeable membrane and the biodegradable tissue interface.
Claim 2
Dependent Claim 39 words
A composite wound dressing comprising in a layered arrangement, a semipermeable membrane, a supporting and reinforcing permeable layer, and a non-stick, self-sealing biodegradable tissue interface, said permeable layer being located between the semipermeable membrane and the biodegradable tissue interface.
Claim 3
Dependent Claim 24 words
A wound dressing as claimed in claim 1, wherein the supporting and reinforcing permeable layer is either an electrical insulator or an electrical conductor.
Claim 4
Dependent Claim 28 words
A wound dressing as claimed in claim 2, wherein the said permeable layer is a polyester, polyethylene, rayon or cotton fabric coated with carbon-doped silicon or natural rubber.
Claim 5
Dependent Claim 41 words
A wound dressing as claimed in claim 2, wherein the said permeable layer is a polyester, polyethylene, rayon or cotton fabric plated or deposited with metals such as silver, zinc, gold, platinum, carbon or coated with carbon-doped silicon or natural rubber.
Claim 6
Dependent Claim 18 words
A wound dressing as claimed in claim 2, wherein the said permeable layer is a charcoal cloth fabric.
Claim 7
Dependent Claim 32 words
A wound dressing as claimed in claim 5, wherein the said cloth fabric is produced by carbonising and activating a woven viscose rayon fabric in a temperature range of (700 - 1200)°C.
Claim 8
Dependent Claim 25 words
A wound dressing as claimed in any preceding claim wherein the said tissue interface is a biodegradable polymer or synthetic collagen produced from animal sources.
Claim 9
Dependent Claim 35 words
A wound dressing as claimed in any one of claims 1-6, wherein the said biodegradable interface is a sodium-calcium alginate mixture with a ratio of (Na-Ca)=0. 1 to 50 and it is produced from seaweed.
Claim 10
Dependent Claim 42 words
A wound dressing as claimed in any one of claims 1-6, wherein the said biodegradable interface is a collagen-alginate complex with a ratio of (Collagen/Alginate) = 0, 1 to 30 and is produced as a semipermeable film or an opened foamed structure.
Claim 11
Dependent Claim 31 words
A wound dressing as claimed in any preceding claims wherein the biodegradable tissue interface is treated (with methylglyoxal or alike) to increase electron spin density and electrical conductivity and dielectric dispersion.
Claim 12
Dependent Claim 17 words
A wound dressing as claimed in any preceding claim wherein the semipermeable membrane is a synthetic collagen.
Claim 13
Dependent Claim 21 words
A wound dressing as claimed in any one of claims 1-8 where the semipermeable membrane is an alginate or biocompatible polymer.
Claim 14
Dependent Claim 28 words
A wound dressing as claimed in any of the claims of the (1-11) where any one of the composite layer material is used as a temporary wound cover.
Claim 15
Dependent Claim 17 words
A composite wound dressing comprising in a layered arrangement, a semipermeable membrane and a biodegradable tissue interface.
Claim 16
Dependent Claim 17 words
A composite wound dressing comprising in a layered arrangement, a semipermeable membrane and a biodegradable tissue interface.
Claim 17
Dependent Claim 19 words
A composite wound dressing comprising in a layered arrangement, a reinforcing and supporting permeable layer and biodegradable tissue interface.
Claim 18
Dependent Claim 19 words
A composite wound dressing comprising in a layered arrangement, a reinforcing and supporting permeable layer and biodegradable tissue interface.
Claim 19
Dependent Claim 21 words
A composite wound dressing comprising in a layered arrangement, a semipermeable membrane and an electrically conductive reinforcing and supporting permeable layer.
Claim 20
Dependent Claim 21 words
A composite wound dressing comprising in a layered arrangement, a semipermeable membrane and an electrically conductive reinforcing and supporting permeable layer.
Claim 21
Dependent Claim 20 words
A permeable electrically conductive dressing as hereinbefore described with reference to Fig. (1, 2, 3, 4, 5) of the drawings.
Claim 22
Dependent Claim 20 words
A permeable electrically conductive dressing as hereinbefore described with reference to Fig. (1, 2, 3, 4, 5) of the drawings.
Claim 23
Dependent Claim 42 words
A wound dressing substantially as hereinbefore described with reference to Fig. 1 or Fig. 2 or Fig. 3 or Fig. 4 or Fig. 5 of the drawings with or without incorporating growth promoting therapeutic antibacterial or anti-allergic agents for controlled topical therapy.
Claim 24
Dependent Claim 42 words
A wound dressing substantially as hereinbefore described with reference to Fig. 1 or Fig. 2 or Fig. 3 or Fig. 4 or Fig. 5 of the drawings with or without incorporating growth promoting therapeutic antibacterial or anti-allergic agents for controlled topical therapy.

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