Apparatus for determining the concentration of light-absorbing materials in blood
First Claim
1. An apparatus for determining a concentration of at least one of a tissue term and light absorbing materials in blood comprising:
- light generating means for generating light beams of different wavelengths;
photoelectric transducing means for converting light beams, which are emitted from the light generating means, and transmitted through a tissue of living body, into electrical signals;
pulsation calculating means for calculating pulsations of absorbency of the tissue of living body for each wavelength on the basis of output signals from the photoelectric transducing means;
pulsation ratio calculating means for calculating a ratio of the pulsations of the absorbency of each wavelength, calculated by the pulsation calculating means; and
first concentration calculating means for performing the calculations of a value of said tissue term on the basis of an output signal from the pulsation ratio calculating means using a formula having a single unknown on the tissue term, which is constructed on the basis of the fact that a predetermined relation is present between the tissue terms of the different wavelengths.
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Abstract
Light beams of different wavelengths, emitted from a light generating device, are transmitted through a living tissue. The transmitted light beams are converted into electrical signals by a photoelectric transducing device. A pulsation calculating device calculates a pulsation of an absorbance of tissue of a living tissue for each wavelength on the basis of the output signal of the photoelectric transducing device. By using this, a pulsation ratio calculating device calculates the ratio of the pulsations of the absorbance values. A concentration calculating device puts the output signal of the pulsation ratio calculating device into a formula having a single unknown on the tissue term, which is constructed on the basis of the fact that a predetermined relation is present between the tissue terms of the respective wavelengths, thereby calculating a value of the tissue term and the concentration of light absorbing material in blood.
141 Citations
13 Claims
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1. An apparatus for determining a concentration of at least one of a tissue term and light absorbing materials in blood comprising:
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light generating means for generating light beams of different wavelengths; photoelectric transducing means for converting light beams, which are emitted from the light generating means, and transmitted through a tissue of living body, into electrical signals; pulsation calculating means for calculating pulsations of absorbency of the tissue of living body for each wavelength on the basis of output signals from the photoelectric transducing means; pulsation ratio calculating means for calculating a ratio of the pulsations of the absorbency of each wavelength, calculated by the pulsation calculating means; and first concentration calculating means for performing the calculations of a value of said tissue term on the basis of an output signal from the pulsation ratio calculating means using a formula having a single unknown on the tissue term, which is constructed on the basis of the fact that a predetermined relation is present between the tissue terms of the different wavelengths. - View Dependent Claims (2, 3, 4, 5)
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6. A method for determining at least one of a tissue term and a concentration of light absorbing materials, comprising the steps of:
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generating light beams of different wavelengths; converting light beams, which are emitted from light generating means, and transmitted through a tissue of living body, into electrical signals; calculating a pulsation of an absorbance of the tissue of a living body for each wavelength on the basis of output signals from a photoelectric transducing means; calculating a ratio of the pulsations of the absorbency of each wavelength, which are calculated by pulsation calculating means; and performing the calculations of a value of said tissue term on the basis of an output signal from the pulsation ratio calculating means, and calculating a formula having a single unknown on the tissue term, which is constructed on the basis of the fact that a predetermined relation is present between the tissue terms of the different wavelengths. - View Dependent Claims (7, 8)
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9. An apparatus for determining at least one of a value of a tissue term and a concentration of light absorbing materials, comprising:
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light generating means for generating light beams of different wavelengths; photoelectric transducing means for converting light beams, which are emitted from the said light generating means, and transmitted through a tissue of living body into electrical signals; pulsation calculating means for calculating pulsations of absorbency of the tissue of the living body for each wavelength on the basis of output signals of said photoelectric transducing means; pulsation ratio calculating means for calculating ratios of the pulsations of the absorbency of each wavelength calculated by said pulsation calculating means; and first concentration calculating means for performing the calculations of said value of said tissue term and the concentration of light absorbing materials on the basis of an output signal from the pulsation ratio calculating means using a formula having a single unknown on the tissue term, which is constructed on the basis of the fact that a predetermined relation is present between the tissue terms of the different wavelengths. - View Dependent Claims (10, 11, 12)
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13. A method for determining at least one of a value of a tissue term and a concentration of light absorbing materials, comprising the steps of:
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generating light beams of different wavelengths; converting light beams, which are emitted from light generating means, and transmitted through a tissue of living body, into electrical signals; calculating a pulsation ratio of an absorbance of the tissue of the living body for each wavelength on the basis of output signals from a photoelectric transducing means; calculating ratios of the pulsations of the absorbency of each wavelength which are calculated by pulsation calculating means; and performing the calculations of said value of said tissue term and the concentration of light absorbing materials on the basis of an output signal from the pulsation ratio calculating means, and calculating a formula having a single unknown on the tissue term, which is constructed on the basis of the fact that a predetermined relation is present between the tissue term of the different wavelengths.
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Specification