US 10,376,157 B2
Systems and methods for determining respiration information using phase locked loop
James Dripps, West Linton (GB); James Ochs, Palo Alto, CA (US); and Paul S. Addison, Edinburgh (GB)
Filed by Nellcor Puritan Bennett Ireland, Mervue, Galway (IE)
Filed on Jan. 21, 2016, as Appl. No. 15/3,761.
Application 15/003,761 is a continuation of application No. 13/343,389, filed on Jan. 4, 2012, granted, now 9,247,896.
Prior Publication US 2016/0135691 A1, May 19, 2016
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/0205 (2006.01); A61B 5/08 (2006.01); A61B 5/0295 (2006.01); A61B 5/00 (2006.01); A61B 5/1455 (2006.01)
CPC A61B 5/0205 (2013.01) [A61B 5/0295 (2013.01); A61B 5/08 (2013.01); A61B 5/0816 (2013.01); A61B 5/14551 (2013.01); A61B 5/7225 (2013.01); A61B 5/7246 (2013.01); A61B 5/7278 (2013.01); A61B 5/742 (2013.01)] 20 Claims
OG exemplary drawing
1. A method for determining respiration rate using a patient monitor, the method comprising:
receiving a photoplethysmograph (PPG) signal;
generating, using the patient monitor, an oscillator signal;
generating, using the patient monitor, a phase-shifted oscillator signal based on a phase difference between the PPG signal and the oscillator signal;
generating, using the patient monitor, an amplitude demodulated signal by multiplying the phase-shifted oscillator signal and the PPG signal;
determining, using the patient monitor, the respiration rate based on the amplitude demodulated signal; and
displaying, using a display, the respiration rate.