US 12,268,499 B2
System and method for robust pulse oximetry
Saeed Mohammadi, Sunnyvale, CA (US); Albert E. Cerussi, San Jose, CA (US); and Paul D. Mannheimer, Los Altos, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Feb. 28, 2024, as Appl. No. 18/590,444.
Application 18/590,444 is a continuation of application No. 17/663,411, filed on May 13, 2022, granted, now 11,931,147.
Application 17/663,411 is a continuation of application No. 16/583,211, filed on Sep. 25, 2019, granted, now 11,331,016, issued on May 17, 2022.
Claims priority of provisional application 62/739,039, filed on Sep. 28, 2018.
Prior Publication US 2024/0245329 A1, Jul. 25, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/1455 (2006.01); A61B 5/00 (2006.01); A61B 5/024 (2006.01)
CPC A61B 5/14552 (2013.01) [A61B 5/681 (2013.01); A61B 5/7203 (2013.01); A61B 5/7221 (2013.01); A61B 5/02433 (2013.01); A61B 5/02438 (2013.01); A61B 2562/0238 (2013.01); A61B 2562/0242 (2013.01); A61B 2562/046 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
measuring physiological signals including a first physiological signal at a first wavelength, a second physiological signal at a second wavelength and a third physiological signal at a third wavelength;
determining whether one or more criteria are met for the physiological signals, the one or more criteria including a criterion based on the third physiological signal at the third wavelength;
assigning a confidence value to the first physiological signal and the second physiological signal, wherein:
in accordance with the determination that the one or more criteria are met for the physiological signals, assigning a first confidence value to the first physiological signal and the second physiological signal; and
in accordance with the determination that the one or more criteria are not met for the physiological signals, assigning a second confidence value, less than the first confidence value, to the first physiological signal and the second physiological signal; and
estimating a physiological characteristic using the first physiological signal, the second physiological signal, and the assigned confidence value.