×

Nitric oxide measurements in patients using flowfeedback

  • US 8,425,428 B2
  • Filed: 03/16/2009
  • Issued: 04/23/2013
  • Est. Priority Date: 03/31/2008
  • Status: Active Grant
First Claim
Patent Images

1. A method performed by a nitric oxide (NO) monitoring system of determining exhaled nitric oxide (FENO) from a patient, the method comprising:

  • collecting, by a patient breathing circuit, exhaled gases from the patient;

    measuring an exhalation flow rate of the exhaled gases as a function of time;

    determining an average exhalation flow rate of the exhaled gases based on the measured exhalation flow rate as a function of time;

    calculating a baseline correction factor that is a function of the measured FeNO concentration at the average exhalation flow rate and an FeNO concentration for a healthy person at the average exhalation flow rate;

    normalizing the measured FeNO concentration using the baseline correction factor to obtain a normalized FeNO;

    adjusting the normalized FeNO to a selected flow rate; and

    scaling back the normalized FeNO using the baseline correction factor to determine the FeNO of the patient.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×