US 12,290,358 B2
Pulse oximetry methods, devices and systems
Fernando De Benedetto, Chieti (IT); Matteo Aventaggiato, Chieti (IT); Marco Raimondi, Chieti (IT); and Alberto Visconti, Chieti (IT)
Assigned to LIFE METER SRL, Chieti (IT)
Appl. No. 17/767,802
Filed by LIFE METER SRL, Chieti (IT)
PCT Filed Oct. 9, 2020, PCT No. PCT/EP2020/078516
§ 371(c)(1), (2) Date Apr. 8, 2022,
PCT Pub. No. WO2021/069729, PCT Pub. Date Apr. 15, 2021.
Claims priority of application No. 1914632 (GB), filed on Oct. 9, 2019.
Prior Publication US 2024/0081696 A1, Mar. 14, 2024
Int. Cl. A61B 5/1455 (2006.01); A61B 5/00 (2006.01); A61B 5/0205 (2006.01); A61B 5/024 (2006.01); A61B 5/1495 (2006.01)
CPC A61B 5/14551 (2013.01) [A61B 5/0205 (2013.01); A61B 5/1495 (2013.01); A61B 5/681 (2013.01); A61B 5/02416 (2013.01); A61B 5/02438 (2013.01); A61B 2560/0223 (2013.01); A61B 2562/043 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of taking pulse oximetry measurements on a specific patient, the method comprising:
using a calibration pulse-oximeter, estimating one or more first, reference SpO2 values from a first, reference PPG signal measured by the calibration pulse-oximeter on a first, reference area of the human body of said specific patient;
wherein said calibration pulse-oximeter comprises one or more light emitters adapted to emit light directed into a human tissue, and at least one light detector for detecting light reflected from said tissue;
wherein the first, reference area of the human body of said specific patient is a fingertip or an ear lobe of said specific patient, having greater blood perfusion than a second, target area of the human body of said specific patient located generally on an underside of a wrist of said specific patient;
using the calibration pulse-oximeter, estimating one or more second SpO2 values from a second PPG signal measured on said second, target area of the specific patient;
calculating an offset parameter on the basis of the one or more first, reference SpO2 values and the one or more second SpO2 values; and
using a bracelet-type measurement pulse-oximetry device also comprising one or more light emitters adapted to emit light directed into a human tissue, and at least one light detector for detecting light reflected from said tissue, measuring a third PPG signal from the second, target area of the specific patient and estimating one or more third SpO2 values from the third PPG signal, wherein said third SpO2 values are offset using said offset parameter.