Drug delivery device and method
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United States of America Patent
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Dec 25, 2007
Grant Date -
Sep 14, 2006
app pub date -
Apr 23, 2006
filing date -
Nov 26, 2001
priority date (Note) -
In Force
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Abstract
A drug delivery device includes a pressurized reservoir in communication with a flow path to an outlet. The flow path includes two normally-closed valves and a flow restriction. A pressure measurement arrangement measures a differential fluid pressure between two points along the flow path which span at least part of the flow restriction, one of the points being between the valves. A controller selectively opens the valves to deliver a defined quantity of the liquid medicament to the outlet.
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