Patent EP0450671A1 successfully refreshed from Google Patents.
EP0450671A1
Expired / Lapsed
EP
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Wound dressing and method of preparing the same
Assignee: Duphar International Research BV
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Filing: 1991-02-18
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Granted: —
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Expires: 2011-02-18
Abstract
Abstract The invention relates to a wound dresssing comprising (1) a lower layer of a hydrogel of a polymer cross-linked under the influence of electron beam (E.B.) radiation, to which optionally one or more medicinal and/or antibacterial agents and/or one or more auxiliary substances have been added, and (2) a polymeric top layer, in which the top layer consists at least substantially of an elastomer selected from the group consisting of a silicone rubber, a polyether-polyurethane copolymer, a polyester-polyurethane copolymer, a polyether-polyester copolymer and an optionally modified block copolymer based on suitable vinyl monomers, and that a fibrous layer is provided between the lower layer and the top layer for bonding the two layers together. The invention further relates to a method of preparing said wound dressing.
Inventors
- 👤 Wilhelmus E. Hennink
- 👤 Jacobus J. Zandman
- 👤 Maria A. E. Van Der Heijden-Van Beek
- 👤 Hendrik Teunissen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 16:33
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/02; A61F13/0276; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/24; A61F13/023; A61F2013/00361; A61F2013/00655; A61F2013/00676; A61F2013/0068; A61F2013/00727; A61F2013/00748; A61F2013/00757
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A wound dressing comprising (1) a lower layer of a hydrogel of a polymer cross-linked under the influence of electron beam (E.B.) radiation, to which optionally one or more medicinal and/or antibacterial agents and/or one or more auxiliary substances have been added, and (2) a polymeric top layer, which wound dressing is characterised - in that the top layer consists at least substantially of an elastomer selected from the group consisting of a silicone rubber, a polyether-polyurethane copolymer, a polyester-polyurethane copolymer, a polyether-polyester copolymer and an optionally modified block copolymer based on suitable vinylmonomers, and - in that a fibrous layer is provided between the lower layer and the top layer for bonding the two layers together.
Claim 2
Dependent Claim
27 words
A wound dressing as claimed in Claim 1, characterised in that the fibrous layer is an elastic textile layer, preferably a polyester, polyamide or polyurethane fabric (knitting).
Claim 3
Dependent Claim
102 words
A wound dressing as claimed in Claim 1 or 2, characterised - in that the lower layer consists at least substantially of a hydrogel of a polyvinyl alcohol cross-linked under the influence of E.B.-radiation to which optionally one or more medicinal and/or antibacterial agents, in particular silver sulfadiazine,and/or one or more auxiliary substances have been added, - in that the top layer consists of a silicone rubber which has also been cross-linked under the influence of E.B.-radiation, and - in that the fibrous layer for the mutual bonding of the two layers is an elastic textile layer, preferably an elastic fabric (knitting).
Claim 4
Independent Claim
137 words
A method of preparing a wound dressing as claimed in any of the preceding Claims, characterised in that the fibrous layer is provided on a layer of the elastomer which has not yet been cross-linked or is incompletely cross-linked, and that optionally said layer with the fibrous layer provided thereon is then exposed to E.B.-radiation, after which the lower layer is bonded to the fibrous layer by successively providing on the fibrous layer a layer of the hydrogel-forming solution of the polymer to be cross-linked in water, to which solution optionally one or more medicinal and/or antibacterial agents and/or one or more auxiliary substances have been added, and exposing the resulting laminated product to E.B.-radiation, after which optionally another layer of the hydrogel-forming solution is provided and is irradiated until the desired layer thickness has been reached.
Claim 5
Dependent Claim
93 words
A method of preparing a wound dressing as claimed in any of the preceding Claims 1-3, characterised in that successively a layer of the hydrogel-forming solution, to which the agents defined in Claim 4 may have been added, is slightly cured by means of E.B.-radiation to a desired viscosity, a fibrous layer is provided on said layer, and finally, optionally after interim exposure to E.B.-radiation, a layer of the elastomer which has not yet been cross-linked or is incompletely cross-linked is provided thereon, after which the resulting laminated product is exposed to E.B.-radiation.
Claim 6
Dependent Claim
37 words
A method as claimed in Claim 4 or 5, characterised in that silicone rubber is used as an elastomer for the top layer and a solution of polyvinyl alcohol in water is used as the hydrogel-forming solution.
Claim 7
Independent Claim
27 words
A method as claimed in any of the Claims 4-6, characterised in that the resulting wound dressing in a sterile sealing package is finally sterilised by E.B.-radiation.
References Cited (Backward Citations)
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