Wound covering
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United States of America Patent
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-
Jul 30, 1991
Grant Date -
N/A
app pub date -
Nov 22, 1989
filing date -
Nov 29, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a wound covering comprising a sheet of biopolymeric material and a film of a polyurethane resin obtained by reacting a diisocyanate and a random copolymer of tetrahydrofuran and ethylene oxide to produce a urethane prepolymer, and extending the molecular chain of said prepolymer by using a chain extender, said random copolymer containing 20 to 80% by weight of the ethylene oxide unit in the molecular chain thereof and having a number-average molecular weight of 800 to 3000. The wound covering of the present invention is excellent in adhesion flexibility, durability, easy handling, preservation, sterile filtration, compatibility with cell, blood starching, water-vapor permeability. Therefore, it is quite suitable for practical use.
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