Non-invasive measurement of blood analytes
First Claim
1. A method for measuring blood oxygen saturation in blood of a patient, comprising:
- placing against a body part of the patient an apparatus for non-invasive measurement of at least one analyte in the blood in the body part of the patient;
transmitting light via a set of one or more light transmitting fibers to the body part of the patient;
detecting light transmitted from, or reflected through, the body part of the patient via a set of one or more light detector fibers;
determining a measurement of at least one analyte in the blood utilizing a non-pulsatile element of the blood; and
measuring blood oxygen saturation (SO2) using the equation;
SO2=100*(OXI+0.43)/1.5,wherein, OXI is the oxygenation index of the blood and is defined by the equation;
OXI=[(e−
d)/11.7−
(d−
c)/11.6]*100/HbI,wherein, HbI is the hemoglobin index of the blood and is defined by the equation;
HbI=[(b−
a)/27.1+(c−
b)/21.4+(c−
e)/23.3+(c−
f)/13.6]*100,and wherein;
a=absorption value at a first wavelength of light;
b=absorption value at a second wavelength of light;
c=absorption value at a third wavelength of light;
d=absorption value at a fourth wavelength of light;
e=absorption value at a fifth wavelength of light; and
f=absorption value at a sixth wavelength of light,and wherein;
the sixth wavelength of light is greater than the fifth wavelength of light;
the fifth wavelength of light is greater than the fourth wavelength of light;
the fourth wavelength of light is greater than the third wavelength of light;
the third wavelength of light is greater than the second wavelength of light; and
the second wavelength of light is greater than the first wavelength of light.
1 Assignment
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Accused Products
Abstract
An apparatus for the measurement of at least one analyte in the blood of a patient, which includes a light source generating broadband light and a light-transmission arrangement having a plurality of transmitting fibers is positioned for simultaneously transmitting multiple wavelengths of the broadband light from the light source to the blood of the patient. The measurement apparatus further includes an optical fiber arrangement having a plurality of light detector fibers for leading multi-wavelength light, in spectrally unseparated form, transmitted through, or reflected from, the blood and a light detection arrangement for receiving the multi-wavelength light in its spectrally unseparated form from the optical fiber arrangement, for spectrally decomposing the received light, and for determining amplitudes of selected wavelengths of the decomposed light. The measurement apparatus utilizes a non-pulsatile element of the patient'"'"'s blood for determining the measurement of at least one analyte in the blood as a function of the amplitudes of the selected wavelengths.
91 Citations
20 Claims
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1. A method for measuring blood oxygen saturation in blood of a patient, comprising:
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placing against a body part of the patient an apparatus for non-invasive measurement of at least one analyte in the blood in the body part of the patient; transmitting light via a set of one or more light transmitting fibers to the body part of the patient; detecting light transmitted from, or reflected through, the body part of the patient via a set of one or more light detector fibers; determining a measurement of at least one analyte in the blood utilizing a non-pulsatile element of the blood; and measuring blood oxygen saturation (SO2) using the equation;
SO2=100*(OXI+0.43)/1.5,wherein, OXI is the oxygenation index of the blood and is defined by the equation;
OXI=[(e−
d)/11.7−
(d−
c)/11.6]*100/HbI,wherein, HbI is the hemoglobin index of the blood and is defined by the equation;
HbI=[(b−
a)/27.1+(c−
b)/21.4+(c−
e)/23.3+(c−
f)/13.6]*100,and wherein; a=absorption value at a first wavelength of light; b=absorption value at a second wavelength of light; c=absorption value at a third wavelength of light; d=absorption value at a fourth wavelength of light; e=absorption value at a fifth wavelength of light; and f=absorption value at a sixth wavelength of light, and wherein; the sixth wavelength of light is greater than the fifth wavelength of light; the fifth wavelength of light is greater than the fourth wavelength of light; the fourth wavelength of light is greater than the third wavelength of light; the third wavelength of light is greater than the second wavelength of light; and the second wavelength of light is greater than the first wavelength of light. - View Dependent Claims (2, 3, 4, 5)
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6. A method for measuring blood oxygen saturation in blood of a patient, comprising:
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placing against a body part of the patient an apparatus for non-invasive measurement of at least one analyte in the blood in the body part of the patient; transmitting light via a set of one or more light transmitting fibers to the body part of the patient; detecting light transmitted from, or reflected through, the body part of the patient via a set of one or more light detector fibers; determining a measurement of at least one analyte in the blood utilizing a non-pulsatile element of the blood; and measuring blood oxygen saturation (SO2) as a function of OXI, wherein, OXI is the oxygenation index of the blood and is defined as a function of HbI and of absorption values c, d, and e, wherein, HbI is the hemoglobin index of the blood and is defined as a function of absorption values a, b, c, e, and f, and wherein; a=absorption value at a first wavelength of light; b=absorption value at a second wavelength of light; c=absorption value at a third wavelength of light; d=absorption value at a fourth wavelength of light; e=absorption value at a fifth wavelength of light; and f=absorption value at a sixth wavelength of light; and wherein; the sixth wavelength of light is greater than the fifth wavelength of light; the fifth wavelength of light is greater than the fourth wavelength of light; the fourth wavelength of light is greater than the third wavelength of light; the third wavelength of light is greater than the second wavelength of light; and the second wavelength of light is greater than the first wavelength of light. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for a measurement of at least one analyte in blood of a patient, comprising:
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providing a light source generating broadband light; simultaneously transmitting multiple wavelengths of said broadband light from said light source to the blood of the patient; receiving multi-wavelength light, in spectrally unseparated form, transmitted from, or reflected through, the blood of the patient, via a set of one or more light detector fibers; spectrally decomposing the received multi-wavelength light into decomposed light; determining amplitudes of selected wavelengths of the decomposed light; and utilizing a non-pulsatile element, exclusive of any pulsatile element of the blood of the patient for determining a measurement of at least one analyte in the blood as a function of the amplitude of the selected wavelengths. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification