US 11,701,028 B2
System for processing respiratory rate
Carlos A. Ricci, Apple Valley, MN (US); Vladimir V. Kovtun, Inver Grove Heights, MN (US); and Scott Thomas Mazar, Woodbury, MN (US)
Assigned to VIOS MEDICAL, INC., Woodbury, MN (US)
Filed by Murata Vios, Inc., Woodbury, MN (US)
Filed on Jul. 7, 2020, as Appl. No. 16/922,616.
Claims priority of provisional application 62/883,339, filed on Aug. 6, 2019.
Prior Publication US 2021/0038115 A1, Feb. 11, 2021
Int. Cl. A61B 5/08 (2006.01); A61B 5/00 (2006.01); A61B 5/085 (2006.01)
CPC A61B 5/0816 (2013.01) [A61B 5/0803 (2013.01); A61B 5/085 (2013.01); A61B 5/7203 (2013.01); A61B 5/7225 (2013.01); A61B 5/7235 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A non-transitory computer readable storage medium encoded with a computer program, the program comprising instructions that when executed by one or more data processing apparatus cause the one or more data processing apparatus to perform operations comprising:
receiving a signal corresponding to impedance across a patient's chest cavity;
filtering the signal using one or more filters that reduce noise and center the signal around a zero baseline;
adjusting an amplitude of the filtered signal based on a threshold value;
separating the amplitude-adjusted signal into component signals, wherein each of the component signals represents a frequency-limited band;
detecting a fractional phase transition of a component signal of the component signals;
selecting a dominant component signal from the component signals based on amplitudes of the component signals at a time corresponding to the detected fractional phase transition;
determining a frequency of the dominant component signal at the time corresponding to the detected fractional phase transition; and
determining a respiratory rate of the patient based on the determined frequency.