System and method of obtaining measuring characteristic correction factors for respiratory flow measuring device using static pressure difference
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United States of America Patent
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Aug 17, 2004
Grant Date -
Sep 11, 2003
app pub date -
Dec 23, 2002
filing date -
Jan 9, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a system (1) for obtaining measuring characteristic correction factors for a respiratory flow measuring device (50) using a differential pressure difference. The system (1) has a 3 L syringe (10), a detecting unit (20), an A/D converter (30) and a computer (40). The 3 L syringe (10) is connected to a respiratory tube of the respiratory flow measuring device (50) through a duct line. The detecting unit (20) detects volume variation within the syringe (10) and outputs the detected result as a voltage signal. The A/D converter (30) converts a volume variation signal, detected as the voltage signal by the detecting unit (20), and a differential pressure variation signal, detected as a voltage signal by a differential pressure sensor (54) through a signal extracting circuit (56) into digital signals. The computer (40) calculates measuring characteristic correction factors using the digital signals.
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