Polylactic acid microspheres and process for producing the same
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United States of America Patent
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-
Feb 19, 1991
Grant Date -
N/A
app pub date -
Nov 10, 1987
filing date -
Nov 12, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Polylactic acid microspheres having an average particle diameter of about 0.1 to 10 .mu.m which are produced from solution containing a physiologically active substance by the solvent-evaporation drying process. The microspheres are produced by emulsifying the solution in a non-solvent by the aid of ultrasonic wave. The microspheres produce a sustained release effect of the physiologically active substance.
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- Non-US Classification not provided for expired patents
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