Method and device for releasing powder
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United States of America Patent
Stats
-
Mar 4, 2003
Grant Date -
Oct 10, 2002
app pub date -
Jun 7, 2001
filing date -
Apr 5, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An inhaler device and a method in which powder for inhalation is jetted off a prepared device surface containing a defined pre-metered quantity of finely divided powder. The jetting function is obtained by a directed air stream pushing or cutting free a medical powder applied to a carrier surface and by creating a stream of air dispersing the powder into inspiratory air at the moment it is being inhaled. The inhaler device includes active (air permeable) porous walls for preventing finely divided powder from sticking to the inner faces of the inhaler device by creating a pressure gradient across the active wall, thus forcing a small flow of air through the active wall thereby keeping the powder from sticking to the inner faces.
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