Concentration-measurement device and concentration-measurement method
First Claim
1. A concentration measurement apparatus measuring a temporal relative change amount of at least one of total hemoglobin concentration, oxygenated hemoglobin concentration, and deoxygenated hemoglobin concentration in the head that vary due to repetition of chest compression, comprising:
- a light source that makes measurement light having at least a first wavelength λ
1 and a second wavelength λ
2 incident on the head;
a light detector that detects the measurement light that has propagated through the interior of the head and generating a first detection signal corresponding to the first wavelength λ
1 and a second detection signal corresponding to the second wavelength λ
2 in accordance with an intensity of the measurement light; and
a processor electrically connected to the light detector and programmed to determine, based on the first detection signal and the second detection signal, the temporal relative change amount of at least one of the total hethoglobin concentration (Δ
cHb), the oxygenated hemoglobin concentration (Δ
O2Hb), and the deoxygenated hemoglobin concentration (Δ
HHb),wherein the processor is programmed to perform a filtering process that removes frequency components less than a predetermined frequency of not more than 1.66 Hz to extract information on the concentration change due to chest compression, and calculate information related to a variation frequency of the relative change amount corresponding to a current frequency of chest compression, andwherein a calculation cycle of the relative change amount is not more than 0.2 seconds.
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Accused Products
Abstract
A concentration measurement apparatus measures a temporal relative change amount (ΔcHb, ΔO2Hb) of either or both of total hemoglobin concentration and oxygenated hemoglobin concentration in the head that vary due to repetition of chest compression, and includes a light incidence section making measurement light incident on the head, a light detection section detecting the measurement light propagated through the interior of the head and generating a detection signal in accordance with the intensity of the measurement light, and a CPU determining, based on the detection signal, the relative change amount (ΔcHb, ΔO2Hb) and performing a filtering process of removing frequency components less than a predetermined frequency from frequency components contained in the relative change amount (ΔcHb, ΔO2Hb).
13 Citations
13 Claims
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1. A concentration measurement apparatus measuring a temporal relative change amount of at least one of total hemoglobin concentration, oxygenated hemoglobin concentration, and deoxygenated hemoglobin concentration in the head that vary due to repetition of chest compression, comprising:
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a light source that makes measurement light having at least a first wavelength λ
1 and a second wavelength λ
2 incident on the head;a light detector that detects the measurement light that has propagated through the interior of the head and generating a first detection signal corresponding to the first wavelength λ
1 and a second detection signal corresponding to the second wavelength λ
2 in accordance with an intensity of the measurement light; anda processor electrically connected to the light detector and programmed to determine, based on the first detection signal and the second detection signal, the temporal relative change amount of at least one of the total hethoglobin concentration (Δ
cHb), the oxygenated hemoglobin concentration (Δ
O2Hb), and the deoxygenated hemoglobin concentration (Δ
HHb),wherein the processor is programmed to perform a filtering process that removes frequency components less than a predetermined frequency of not more than 1.66 Hz to extract information on the concentration change due to chest compression, and calculate information related to a variation frequency of the relative change amount corresponding to a current frequency of chest compression, and wherein a calculation cycle of the relative change amount is not more than 0.2 seconds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A concentration measurement method of measuring a temporal relative change amount of at least one of total hemoglobin concentration, oxygenated hemoglobin concentration, and deoxygenated hemoglobin concentration in the head that vary due to repetition of chest compression, the method comprising:
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making measurement light having at least a first wavelength λ
1 and a second wavelength λ
2, by a light source, incident on the head;detecting, by a light detector, the measurement light that has propagated through the interior of the head and generating a first detection signal corresponding to the first wavelength λ
1 and a second detection signal corresponding to the second wavelength λ
2 in accordance with an intensity of the measurement light; anddetermining, by a processor, based on the first detection signal and the second detection signal, the temporal relative change amount of at least one of the total hemoglobin concentration (Δ
cHb), the oxygenated hemoglobin concentration (Δ
O2Hb), and the deoxygenated hemoglobin concentration (Δ
HHb), wherein the processor is programmed to perform a filtering process that removes frequency components less than a predetermined frequency of not more than 1.66 Hz to extract information on the concentration change due to chest compression, and calculate information related to a variation frequency of the relative change amount corresponding to a current frequency of chest compression, andwherein a calculation cycle of the relative change amount is not more than 0.2 seconds.
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Specification