Apparatus and method for measuring oxygen saturation in blood
First Claim
1. An apparatus for measuring an oxygen saturation in blood, comprising:
- a plurality of light emitters, adapted to irradiate a living tissue with a plurality of light beams having different wavelengths;
a light receiver, adapted to receive the light beams reflected from or transmitted through the living tissue to generate pulse wave signals in accordance with pulsations of the blood In the living tissue;
a separator, operable to separate each of the pulse wave signals into a plurality of amplitude signals each of which is associated with one frequency, thereby generating pairs of amplitude signals each of which is associated with one of a plurality of frequencies;
a first processor, operable to calculate a ratio between the amplitude signals in each of the pairs of the amplitude signals;
a selector, operable to select one of the pairs of the amplitude signals; and
a second processor, operable to calculate the oxygen saturation based on the ratio of the selected one of the pairs of the amplitude signals.
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Abstract
In an apparatus for measuring an oxygen saturation in blood, a plurality of light emitters are adapted to irradiate a living tissue with a plurality of light beams having different wavelengths. A light receiver is adapted to receive the light beams reflected from or transmitted through the living tissue to generate pulse wave signals in accordance with pulsations of the blood in the living tissue. A separator is operable to separate each of the pulse wave signals into a plurality of amplitude signals each of which is associated with one frequency, thereby generating pairs of amplitude signals each of which is associated with one of a plurality of frequencies. A first processor is operable to calculate a ratio between the amplitude signals in each of the pairs of the amplitude signals. A selector is operable to select one of the pairs of the amplitude signals. A second processor is operable to calculate the oxygen saturation based on the ratio of the selected one of the pairs of the amplitude signals.
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Citations
25 Claims
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1. An apparatus for measuring an oxygen saturation in blood, comprising:
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a plurality of light emitters, adapted to irradiate a living tissue with a plurality of light beams having different wavelengths;
a light receiver, adapted to receive the light beams reflected from or transmitted through the living tissue to generate pulse wave signals in accordance with pulsations of the blood In the living tissue;
a separator, operable to separate each of the pulse wave signals into a plurality of amplitude signals each of which is associated with one frequency, thereby generating pairs of amplitude signals each of which is associated with one of a plurality of frequencies;
a first processor, operable to calculate a ratio between the amplitude signals in each of the pairs of the amplitude signals;
a selector, operable to select one of the pairs of the amplitude signals; and
a second processor, operable to calculate the oxygen saturation based on the ratio of the selected one of the pairs of the amplitude signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for measuring an oxygen saturation in blood, comprising:
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irradiating a living tissue with a plurality of light beams having different wavelengths;
receiving the light beams reflected from or transmitted through the living tissue to generate pulse wave signals in accordance with pulsations of the blood in the living tissue;
separating each of the pulse wave signals into a plurality of amplitude signals each of which is associated with one frequency, thereby generating pairs of amplitude signals each of which is associated with one of a plurality of frequencies;
calculating a ratio between the amplitude signals in each of the pairs of the amplitude signals;
selecting one of the pairs of the amplitude signals; and
calculating the oxygen saturation based on the ratio of the selected one of the pairs of the amplitude signals. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification