Pulse photometer and method for calculating concentration of light absorber in blood
First Claim
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1. A pulse photometer comprising:
- a first light emitter which is configured to emit a first light beam having a first wavelength;
a second light emitter which is configured to emit a second light beam having a second wavelength;
a light detector which is configured to output a first intensity signal in accordance with an intensity of the first light beam that is transmitted through or reflected from a body of a subject, and a second intensity signal in accordance with an intensity of the second light beam that is transmitted through or reflected from the body of the subject; and
at least one processor and memory configured to;
acquire a first variation based on the first intensity signal, wherein the first variation corresponds to a light attenuation variation of the first light beam resulting from pulsation of blood in the subject;
acquire a second variation based on the second intensity signal, wherein the second variation corresponds to a light attenuation variation of the second light beam adjusted by a first offset, the light attenuation variation of the second beam resulting from the pulsation of the blood in the subject; and
calculate a blood light absorber concentration, based on the first variation and the second variation,wherein the first offset is based on an inverse of the light attenuation variation of the first light beam.
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Abstract
A pulse photometer includes: a first variation acquirer acquiring a first variation corresponding to a light attenuation variation of a first light beam due to pulsation of blood in a subject, based on a first intensity signal corresponding to an intensity of the first light beam that is transmitted through or reflected from a body of the subject, and that has a first wavelength; a second variation acquirer acquiring a second variation; and a concentration calculator calculating a blood light absorber concentration, based on the first and second variations, the second variation containing a first offset which is based on an inverse of the light attenuation variation of the first light beam.
7 Citations
11 Claims
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1. A pulse photometer comprising:
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a first light emitter which is configured to emit a first light beam having a first wavelength; a second light emitter which is configured to emit a second light beam having a second wavelength; a light detector which is configured to output a first intensity signal in accordance with an intensity of the first light beam that is transmitted through or reflected from a body of a subject, and a second intensity signal in accordance with an intensity of the second light beam that is transmitted through or reflected from the body of the subject; and at least one processor and memory configured to; acquire a first variation based on the first intensity signal, wherein the first variation corresponds to a light attenuation variation of the first light beam resulting from pulsation of blood in the subject; acquire a second variation based on the second intensity signal, wherein the second variation corresponds to a light attenuation variation of the second light beam adjusted by a first offset, the light attenuation variation of the second beam resulting from the pulsation of the blood in the subject; and calculate a blood light absorber concentration, based on the first variation and the second variation, wherein the first offset is based on an inverse of the light attenuation variation of the first light beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A pulse photometer comprising:
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at least one processor and memory configured to; acquire a first variation based on a first intensity signal, wherein the first variation corresponds to a light attenuation variation of a first light beam resulting from pulsation of blood in a subject, the first intensity signal corresponding to an intensity of the first light beam that is transmitted through or reflected from a body of the subject; acquire a second variation based on a second intensity signal, wherein the second variation corresponds to a light attenuation variation of a second light beam adjusted by a first offset, the light attenuation variation of the second beam resulting from the pulsation of the blood in the subject, the second intensity signal corresponding to an intensity of the second light beam that is transmitted through or reflected from the body of the subject; and calculate a blood light absorber concentration, based on the first variation and the second variation, wherein the first offset is based on an inverse of the light attenuation variation of the first light beam.
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11. A method for calculating a blood light absorber concentration, the method comprising:
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causing a pulse photometer to acquire a first variation based on a first intensity signal, wherein the first variation corresponds to a light attenuation variation of a first light beam resulting from pulsation of blood in a subject, the first intensity signal corresponding to an intensity of the first light beam that is transmitted through or reflected from a body of the subject; causing the pulse photometer to acquire a second variation based on a second intensity signal, wherein the second variation corresponds to a light attenuation variation of a second light beam adjusted by a first offset, the light attenuation variation of the second beam resulting from the pulsation of the blood in the subject, the second intensity signal corresponding to an intensity of the second light beam that is transmitted through or reflected from the body of the subject; and causing the pulse photometer to calculate the blood light absorber concentration, based on the first variation and the second variation, wherein the first offset is based on an inverse of the light attenuation variation of the first light beam.
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Specification