Wound dressing materials
US4233969A · kind A · utility
Inventors
Key dates
| Filing date | Nov 10, 1977 |
| Grant date | Nov 18, 1980 |
| Priority date | — |
| Expiry date | Nov 10, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2013/00855
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A wound dressing material, particularly for burns, comprises a sheet of synthetic plastics material which is permeable to water vapor and air, preferably a polyurethane produced by polymerization of an isocyanate capped polyoxyethylene polyol, without any substantial amount of water present, using a cross-linking agent which reacts with the isocyanate groups. The polyol and cross-linking agent, and preferably also an alkylene oxide surfactant, are agitated to form an aerated mix, spread on a release paper, and heated so that polymerization begins in the exposed upper surface, so as to form a sheet having a dense outer region which is impervious to liquids, a cellular region beneath the dense region, and a smooth glazed surface for application to a wound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.