US 12,070,309 B2
Method, computer programming product and electronic device for calculating blood oxygen saturation
Zheng-De Liu, New Taipei (TW); You-Jyun Syu, New Taipei (TW); Ching-An Cho, New Taipei (TW); and Hao-Gong Chou, New Taipei (TW)
Assigned to Wistron Corp., New Taipei (TW)
Filed by Wistron Corp., New Taipei (TW)
Filed on May 13, 2021, as Appl. No. 17/319,982.
Claims priority of application No. 110102936 (TW), filed on Jan. 27, 2021.
Prior Publication US 2022/0233112 A1, Jul. 28, 2022
Int. Cl. A61B 5/145 (2006.01); A61B 5/00 (2006.01)
CPC A61B 5/14542 (2013.01) [A61B 5/7225 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for calculating blood oxygen saturation, comprising:
detecting a green light signal, an infrared light signal, and a red light signal from a skin;
assigning an extreme value point of the green light signal and the infrared light signal to an extreme value point of a red light signal to obtain a period of the red light signal; and
calculating the blood oxygen saturation according to the extreme value point in the period of the red light signal;
wherein a time point when the green light signal or the infrared light signal has a wave crest is a time point when the red light signal has a wave crest; and
wherein a time point when the infrared light has a wave trough is a time point when the red light signal has a wave trough; and
wherein the green light signal has dicrotic pulse, and the red light signal and the infrared light signal do not have dicrotic pulse.