Polyesters containing alkylene oxide blocks as drug delivery systems
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United States of America Patent
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Nov 21, 1989
Grant Date -
N/A
app pub date -
Sep 5, 1986
filing date -
Sep 5, 1986
priority date (Note) -
Expired
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Abstract
The invention is a slow release drug delivery system comprising a drug and an ABA or AB block copolymer wherein one block (B) is a poly(alkylene oxide) and the other blocks (A) are comprised of degradable random copolymers of (1) the cyclic ester of an alpha-hydroxy acid and (2) a second cyclic ester monomer is with the proviso that the second cyclic ester monomer not the same as the first cyclic ester.
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