Multi-layer wound dressing
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United States of America Patent
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Jun 2, 1998
Issued Date -
N/A
app pub date -
Nov 7, 1996
filing date -
Nov 23, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides wound dressings comprising a molecular filtration membrane having a maximum pore size in the range of from 0.001 .mu.m to 0.5 .mu.m, and preferably in the range of from 0.01 .mu.m to 0.25 .mu.m. The wound dressings may also comprise an absorbent layer atop the molecular filtration membrane and/or a wound contact layer of wound-friendly bioabsorbable material for contacting the wound. In use, the molecular filtration membrane retains high molecular weight biopolymers and wound healing factors at the wound surface while excluding bacteria and allowing rapid egress of wound exudate through the membrane into the absorbent layer.
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