| 摘要 |
<p>The invention provides a wound dressing comprising a layered material comprising a hydrophilic foam layer formed from a first polyurethane and a hydrogel layer formed from a second polyurethane, wherein the hydrogel layer is laminated to the hydrophilic foam layer. The invention also provides methods for preparing a layered structure for use as a cavity wound dressing comprising the steps of: providing a first, foamed polyurethane layer by reacting an isocyanate-capped prepolymer with water and optionally one or more compounds selected from polyurethane chain extending or terminating compounds other than water and catalysts for the polymerisation of isocyanate; providing a second, hydrogel polyurethane layer by reacting an isocyanate-containing prepolymer with one or more compounds selected from water, other polyurethane chain extending or terminating compounds and catalysts for the polymerisation of isocyanate; laminating the second layer to the first layer; curing and drying the polyurethane layers to provide the layered material, wherein the method further comprises slitting the layered material before said step of curing and drying is complete.</p> |
