CONCENTRATION MEASUREMENT DEVICE AND CONCENTRATION MEASUREMENT METHOD

• US 20150045640A1
• Filed: 12/25/2012
• Published: 02/12/2015
• Est. Priority Date: 02/20/2012
• Status: Active Grant

• Current Assignee: Hamamatsu Photonics KK
• Original Assignee: Hamamatsu Photonics KK
• Inventors: Ozaki, Takeo, Suzuki, Susumu
• Granted Patent: US 9,700,248 B2
• Time in Patent Office: Days
• US Class Current: 600/340
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/6814 Head
• CPC Class Codes: G01N 2021/3144 for oxymetry
• CPC Class Codes: G01N 21/314 with comparison of measurements at specific and non-specific wavelengths dual wavelength spectrometry G01J3/427
• CPC Class Codes: G06F 17/17 Function evaluation by approximation methods, e.g. inter- or extrapolation, smoothing, least mean square method G06F17/18 takes precedence ; interpolation for numerical control G05B19/18

Abstract

A concentration measurement apparatus includes a probe, having a light incidence section making measurement light incident on the head and a light detection section detecting the measurement light that has propagated through the interior of the head, and a CPU determining temporal relative change amounts of oxygenated hemoglobin concentration and deoxygenated hemoglobin concentration and determining a correlation coefficient of the relative change amounts and a polarity of a slope of a regression line.

Claims

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 incidence section configured to make measurement light incident on the head;

a light detection section 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 calculation section configured to determine, based on the detection signal, a correlation coefficient of a first temporal relative change amount of the oxygenated hemoglobin concentration and a second temporal relative change amount of the deoxygenated hemoglobin concentration and a polarity of a slope of a regression line of the first relative change amount and the second relative change amount.

2. The apparatus according to claim 1, wherein the calculation section further determines a temporal relative change amount of total hemoglobin concentration based on the first and second relative change amounts, and

the apparatus further comprises a display section configured to display the temporal relative change amount of the total hemoglobin concentration together with the correlation coefficient and the polarity of the slope of the regression line.

3. The apparatus according to claim 1, wherein the calculation section further determines an oxygen saturation based on the first and second relative change amounts, and

the apparatus further comprises a display section configured to display the oxygen saturation together with the correlation coefficient and the polarity of the slope of the regression line.

4. The apparatus according to claim 2, wherein the display section displays the correlation coefficient by at least one of a numeral and a graph.

6. The apparatus according to claim 3, wherein the display section displays the correlation coefficient by at least one of a numeral and a graph.

5. A method of measuring temporal relative change amounts of oxygenated hemoglobin concentration and deoxygenated hemoglobin concentration, that vary due to repetition of chest compression, in a head, the method comprising:

making measurement light incident on the head;

detecting the measurement light that has propagated through the interior of the head and generating a detection signal in accordance with the intensity of the detected measurement light; and

determining, based on the detection signal, a correlation coefficient of a first temporal relative change amount of the oxygenated hemoglobin concentration and a second temporal relative change amount of the deoxygenated hemoglobin concentration and a polarity of a slope of a regression line of the first relative change amount and the second relative change amount.