Absorbent wound dressings
US5981822A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 28, 1998 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Apr 28, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2013/00748
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention provides a wound dressing (1) comprising a wound contacting sheet (4) laminated to one side of an absorbent layer (3) of water-swellable absorbent material such as a polyurethane. A liquid water-impermeable backing layer (2) is laminated to the other side of the absorbent layer (3). The wound contacting sheet is provided with one or more slits (5) therein. Expansion of the absorbent layer (3) due to absorption of wound exudate causes the slits (5) in the wound contacting sheet (4) to expand, thereby allowing passage of high flow rates of wound exudate. If the flow of exudate falls, then the slits close, thereby avoiding excessive drying of the wound surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.