Patent ID: 9700248
Date: 2017-07-11
CPC Classifications: A61B,G01N,G06F

Claim:
1. An apparatus for measuring temporal relative change amounts of oxygenated hemoglobin concentration and deoxygenated hemoglobin concentration, that vary due to repetition of chest compression, in a head, comprising: a light source configured to output measurement light; a light detector configured to detect the measurement light that has propagated through the interior of the head and generate a detection signal in accordance with the intensity of the detected measurement light; and a processor that is electrically coupled to the light detector and programmed to: determine, based on the detection signal, a first temporal relative change amount of the oxygenated hemoglobin concentration and a second temporal relative change amount of the deoxygenated hemoglobin concentration, determine a magnitude of a correlation coefficient of the first and second temporal relative change amounts, determine a polarity of a slope of a regression line of the first and second temporal relative change amounts, and evaluate occurrence of reverse direction blood transmission from the vena cava to the head in the chest compression based on the magnitude of the correlation coefficient and the polarity of the slope of the regression line.