Method for correcting the drift offset of a transducer
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United States of America Patent
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Sep 12, 1995
Issued Date -
N/A
app pub date -
Jan 29, 1993
filing date -
Mar 5, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
A method for correcting the drift offset of a transducer is disclosed which method is used in connection with a portable, battery-powered, hand-held system for releasing a controlled dose of aerosol medication for inhalation by a patient. The device includes a durable body and a medication cassette inserted in the durable body. The body includes a flow sensor having an asymmetrical orifice that is calibrated, independent of the cassette, to convert the sensed pressure due to flow into a flow rate. The orifice is separately calibrated for an inhalation flow rate range and an exhalation flow rate range over a selected number of known flow rates. The sensed pressure value is corrected for transducer offset drift and converted to a flow rate using the calibration data and piecewise linear interpolation.
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