METHOD FOR THE CONTINUOUS NON-INVASIVE DETERMINATION OF THE CONCENTRATION OF BLOOD CONSTITUENTS
First Claim
1. A method for the non-invasive determination of the concentration of blood constituents, comprising:
- radiating a plurality of measurement radiations with respectively different wavelengths by means of a radiation source;
receiving the measurement radiation of a plurality of said wavelengths, as reflected by the body part to be examined, by means of a first light receiver;
receiving the measurement radiation of a plurality of said wavelengths, as transmitted through the body part to be examined, by means of a second light receiver; and
determining the absorption of the measurement radiation of each wavelength, as caused by the body part to be examined, on the basis of the measurement of said reflected radiation by means of the first radiation receiver and the measurement of said transmitted radiation by means of the second radiation receiverwherein that an absorption AgR is determined by the first radiation receiver on the basis of the measurement of the reflected radiation of a first portion r to ri of the wavelengths, and an absorption AgT is determined by the second radiation receiver on the basis of the measurement of the transmitted radiation of a second portion 1 to r of the wavelengths, wherein, for at least one wavelength r, the reflected as well as the transmitted radiation fraction is measured, comprising the further step of;
determining the n concentrations Cb1 to Cbn of blood constituents on the basis of said determined absorptions AgR and respectively AgT of the measurement radiation at each wavelength 1 to n, the computation of the concentrations being performed according to the following equation system;
AT(λ
1)=E(λ
1,b1)*Cb1+ . . . +E(λ
1,bn)*Cbn
AgT(λ
T)=E(λ
r,b1)*Cb1+ . . . +E(λ
r,bn)*Cbn
AgR(λ
r)=(KT/KR)*{E(λ
r,b1)*Cb1+ . . . E(λ
r,bn)*Cbn}
AgR(λ
n)=(KT/KR)*{E(λ
n,b1)*Cb1+ . . . +E(λ
n,bn)*Cbn}
1 Assignment
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Accused Products
Abstract
The invention relates to a method for the non-invasive determination of the concentration of blood constituents, in which a radiation source (12) emits several radiation beams (14), each with a different wavelength. A first photo detector (18) receives the measurement radiation (14) of each wavelength that is reflected by a body part (16) to be examined. A second photo detector (22) receives the measurement radiation (24) of each wavelength that is transmitted by the body part (16) to be examined. The measurement radiation (14) of each wavelength that is absorbed by the body part (16) to be examined is then determined on the basis of the measurement of the reflected radiation (20) by the first radiation receiver (18) and the measurement of the transmitted radiation (24) by the second radiation receiver (22). The concentration of the different constituents is calculated from the absorption of the measurement radiation (14) that has been determined for each wavelength.
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Citations
14 Claims
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1. A method for the non-invasive determination of the concentration of blood constituents, comprising:
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radiating a plurality of measurement radiations with respectively different wavelengths by means of a radiation source; receiving the measurement radiation of a plurality of said wavelengths, as reflected by the body part to be examined, by means of a first light receiver; receiving the measurement radiation of a plurality of said wavelengths, as transmitted through the body part to be examined, by means of a second light receiver; and determining the absorption of the measurement radiation of each wavelength, as caused by the body part to be examined, on the basis of the measurement of said reflected radiation by means of the first radiation receiver and the measurement of said transmitted radiation by means of the second radiation receiver wherein that an absorption AgR is determined by the first radiation receiver on the basis of the measurement of the reflected radiation of a first portion r to ri of the wavelengths, and an absorption AgT is determined by the second radiation receiver on the basis of the measurement of the transmitted radiation of a second portion 1 to r of the wavelengths, wherein, for at least one wavelength r, the reflected as well as the transmitted radiation fraction is measured, comprising the further step of; determining the n concentrations Cb1 to Cbn of blood constituents on the basis of said determined absorptions AgR and respectively AgT of the measurement radiation at each wavelength 1 to n, the computation of the concentrations being performed according to the following equation system;
AT(λ
1)=E(λ
1,b1)*Cb1+ . . . +E(λ
1,bn)*Cbn
AgT(λ
T)=E(λ
r,b1)*Cb1+ . . . +E(λ
r,bn)*Cbn
AgR(λ
r)=(KT/KR)*{E(λ
r,b1)*Cb1+ . . . E(λ
r,bn)*Cbn}
AgR(λ
n)=(KT/KR)*{E(λ
n,b1)*Cb1+ . . . +E(λ
n,bn)*Cbn} - View Dependent Claims (2, 3, 8, 9, 10, 11, 12, 13)
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4-7. -7. (canceled)
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14-16. -16. (canceled)
Specification