Microspheres comprising polymer and drug dispersed there within

Details Microspheres comprising polymer and drug dispersed there within Microspheres comprising polymer and drug dispersed there within

1996-08-02

1998-02-17

Lovering, Richard K.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Particulate form

424425, 424486, 427 221, 42721331, 42721336, 514866, 514963, 514965, A61K 950, A61K 952, B01J 1312

Patent

active

057189218

ABSTRACT:
A method for preparation of biodegradable polymeric drug delivery devices using relatively low temperatures and non-aqueous solutions which is particularly useful with polyanhydrides, thermolabile drugs, and in forming multi-layered devices.
In a first embodiment, the polymer is dissolved in a volatile organic solvent, the drug is dispersed or dissolved in the polymer solution, the mixture is suspended in an organic oil, and the organic solvent is extracted into the oil, creating microspheres. The preferred polymers are polyanhydrides since they are biodegradable and have been proven to be useful in vivo.
In a second embodiment, the polymer is dissolved in organic solvent with or without the drug, and the mixture is suspended in glycerol. The suspension is frozen and the organic solvent slowly evaporated.
Using these embodiments, alone or in combination with other methods including the "hot melt" technique, multi-walled microspheres having each wall degrading at a different rate or containing different drugs can be manufactured.

REFERENCES:
patent: 4479911 (1984-10-01), Fong
patent: 4585651 (1986-04-01), Beck et al.
patent: 4637905 (1987-01-01), Gardner
patent: 4792598 (1988-12-01), Ziegast
patent: 4906474 (1990-03-01), Langer et al.

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