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System and method of obtaining measuring characteristic correction factors for respiratory flow measuring device using static pressure difference

  • US 20030171887A1
  • Filed: 12/23/2002
  • Published: 09/11/2003
  • Est. Priority Date: 01/09/2002
  • Status: Active Grant
First Claim
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1. A system for obtaining measuring characteristic correction factors for a respiratory flow measuring device using a static pressure difference, comprising:

  • a syringe connected to a respiratory tube of the respiratory flow measuring device through a duct line;

    a detecting unit for detecting volume variation within the syringe and outputting the detected result as a voltage signal;

    an analog/digital (A/D) converter for converting analog signals including a volume variation signal detected as the voltage signal by the detecting unit and a differential pressure variation signal detected as a voltage signal by a differential pressure sensor connected to the respiratory flow sensor of the respiratory flow measuring device through a signal extraction circuit into digital signals; and

    a computer for obtaining measuring characteristic correction factors using the digital signals outputted from the A/D converter.

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