Dosage counter for metered dose inhaler (MDI) systems using a miniature pressure sensor
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United States of America Patent
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-
Oct 31, 2000
Issued Date -
N/A
app pub date -
Aug 29, 1997
filing date -
Mar 14, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for directly counting the number of doses expended from a Metered Dose Inhaler (MDI) medicinal delivery system. A miniature pressure sensor and microprocessor is used to detect the pressure pulse in the transfer channel of the mouthpiece of the MDI through which the inhaler dose (the prescribed mixture of aerosol propellant and medicinal drug) is released. The microprocessor processes data reflecting the dynamics of the pressure pulse and counts the number of doses administered. The microprocessor displays the counted doses (or doses remaining) on a miniature digital display. Additional information also may be provided to a user from the display or via an audible signal.
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