Medical aerosol formulations
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United States of America Patent
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Oct 8, 2002
Grant Date -
N/A
app pub date -
Aug 4, 1999
filing date -
Feb 5, 1997
priority date (Note) -
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Abstract
A pressure-liquefied propellant mixture for aerosols, comprising a fluorinated alkane, in particular 1,1,1,2-tetrafluoroethane and/or 1,1,1,2,3,3,3-heptafluoropropane, and carbon dioxide, makes possible an improvement of the wetting properties of pharmaceutically active compounds, with which the formulation problems existing with hydrofluoroalkanes in relation to suspension as well as solution aerosols can be overcome and thus improved medicinal aerosol formulations can be obtained. With the aid of carbon dioxide, it is also possible to specifically influence the pressure and thus the particle size distribution and also by displacement of oxygen from the hydrofluoroalkanes to improve the storage stability of oxidation-sensitive active compounds.
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