• US 20110257551A1
  • Filed: 04/19/2010
  • Published: 10/20/2011
  • Est. Priority Date: 04/19/2010
  • Status: Active Grant
  • ×
    • Pin
First Claim
Patent Images

1. A method for measuring respiratory rate from a patient, comprising the following steps:

  • (a) measuring a time-dependent impedance pneumography signal from the patient with an impedance pneumography sensor connected to at least two electrodes, the impedance pneumography signal representing a time-dependent capacitance change in the patient'"'"'s torso;

    (b) measuring at least one time-dependent motion signal with a motion sensor connected to the patient, the at least one motion signal corresponding to motion of a portion of the patient'"'"'s body to which the motion sensor is attached;

    (c) transforming the time-dependent impedance pneumography signal into a frequency-dependent impedance pneumography spectrum;

    (d) transforming the time-dependent motion signal into a frequency-dependent motion spectrum;

    (e) determining motion components from the frequency-dependent motion spectrum that correspond to the patient'"'"'s motion;

    (f) removing the motion components, or components calculated therefrom, from the frequency-dependent impedance pneumography spectrum to generate a processed frequency-dependent impedance pneumography spectrum; and

    (g) analyzing the processed frequency-dependent impedance pneumography spectrum to determine the patient'"'"'s respiratory rate.

View all claims

    Thank you for your feedback