Wound dressing for use in vacuum therapy
AssigneeConvatec Technologies Inc.
InventorsWayne Bonnefin, Sarah Wroe, Amelia Prentice
Life of this patent
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Abstract
A wound dressing for use in vacuum wound therapy comprising a wound contact layer which is an open structure comprising a yarn comprising gel-forming filaments or fibres, the structure having a porosity which allows exudate to flow through it.
Claims18
A wound dressing for use in vacuum wound therapy comprising a wound contact layer which is an open structure comprising a yarn comprising gel-forming filaments or fibres, the structure having a porosity which allows exudate to flow through it.
A wound dressing as claimed in any preceding claim wherein the yarn has a linear density of 20 tex to 40 tex.
A wound dressing as claimed in any preceding claim wherein the open structure is knitted with a pore or mesh size between 0.5 mm2 to 5.0 mm2.
A device for vacuum wound therapy comprising:
- a wound dressing which is an open structure comprising a yarn of gel-forming filaments or fibres, the structure having a porosity which allows exudate to flow through it;
- a source of vacuum situated to be separated from the wound bed by the wound dressing;
- and
- a vacuum sealing layer covering the wound dressing and adapted to retain relative vacuum in the wound contact layer.
A process for making a yarn comprising gel-forming fibres comprising the steps of:
- (i) blending staple gel-forming fibres optionally with textile fibres;
- (ii) carding to form a continuous web;
- (iii) drawing the web to produce a sliver and
- (iv) rotor spinning to produce a yarn.
A process for making an open structure or net comprising a yarn of gel-forming fibres comprising the steps of:
- (i) embroidering an open structure in a textile yarn on a soluble support film;
- (ii) removing the support film by dissolving it and
- (iii) chemically modifying the structure to give the yarn gel-forming properties to form a structure comprising a yarn of gel forming fibres.
A process for making a yarn comprising gel-forming fibres comprising the steps of:
- (i) obtaining cellulosic staple fibres or filament;
- (ii) spinning or twisting the cellulosic fibres or filament to form a yarn;
- (iii) chemically modifying the yarn to give the yarn gel-forming properties.
A yarn comprising a blend of from 30% to 100% by weight of gel-forming fibres and 0% to 70% by weight textile fibres.
Dependencies are inferred from the claim text.