METHOD, ARRANGEMENT AND SENSOR FOR NON-INVASIVELY MONITORING BLOOD VOLUME OF A SUBJECT
First Claim
1. A method for monitoring blood volume status of a subject, the method comprising:
- acquiring in-vivo measurement signals at a plurality of measurement wavelengths, the in-vivo measurement signals being indicative of absorption caused by blood of a subject;
determining, based on the in-vivo measurement signals, a hemoglobin measure indicative of concentration of hemoglobin in the blood of the subject, wherein the determining includes determining successive values of the hemoglobin measure; and
monitoring, based on the successive values of the hemoglobin measure, the blood volume of the subject.
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Accused Products
Abstract
A method, arrangement and sensor for monitoring blood status of a subject are disclosed. In-vivo measurement signals indicative of absorption caused by blood are acquired at a plurality of measurement wavelengths. Based on the in-vivo measurement signals, successive values are determined for a hemoglobin parameter indicative of the concentration of hemoglobin in the blood of the subject and the blood volume status of the subject is monitored based on the successive values. The monitoring may involve determining the absolute value of the blood volume or relative changes in the blood volume. In one embodiment, the absolute value of the blood volume is indicated continuously together with hemoglobin concentration and composition.
23 Citations
20 Claims
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1. A method for monitoring blood volume status of a subject, the method comprising:
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acquiring in-vivo measurement signals at a plurality of measurement wavelengths, the in-vivo measurement signals being indicative of absorption caused by blood of a subject; determining, based on the in-vivo measurement signals, a hemoglobin measure indicative of concentration of hemoglobin in the blood of the subject, wherein the determining includes determining successive values of the hemoglobin measure; and monitoring, based on the successive values of the hemoglobin measure, the blood volume of the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An arrangement for monitoring blood volume status of a subject, the arrangement comprising:
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a signal reception unit configured to receive in-vivo measurement signals corresponding to a plurality of measurement wavelengths, the in-vivo measurement signals being indicative of absorption caused by blood of a subject; a hemoglobin determination unit configured to determine, based on the in-vivo measurement signals, a hemoglobin measure indicative of concentration of hemoglobin in the blood of the subject, wherein the hemoglobin determination unit is configured to determine successive values of the hemoglobin measure; and a monitoring unit configured to monitor, based on the successive values of the hemoglobin measure, the blood volume of the subject. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A sensor for determining blood volume status of a subject, the sensor being attachable to the subject and comprising:
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an emitter unit configured to emit radiation through the tissue of the subject at a plurality of measurement wavelengths; a detector unit configured to receive the radiation and to produce in-vivo measurement signals corresponding to the plurality of measurement wavelengths, wherein the in-vivo measurement signals are indicative of absorption caused by blood of the subject; a hemoglobin determination unit configured to determine, based on the in-vivo measurement signals, a hemoglobin measure indicative of concentration of hemoglobin in the blood of the subject, wherein the hemoglobin determination unit is configured to determine successive values of the hemoglobin measure; an interface unit configured to send the successive values of the hemoglobin measure to an external unit configured to monitor the blood volume of the subject based on the successive values.
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19. An apparatus for monitoring blood volume status of a subject, the apparatus comprising:
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a reception unit configured to receive successive values of a hemoglobin measure indicative of hemoglobin concentration in blood of a subject; and a monitoring unit configured to monitor, based on the successive values of the hemoglobin measure, the blood volume of the subject.
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20. A computer program product for monitoring blood volume status of a subject, the computer program product comprising:
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a first program product portion configured to receive in-vivo measurement signals corresponding to a plurality of measurement wavelengths, the in-vivo measurement signals being indicative of absorption caused by blood of a subject; a second program product portion configured to determine, based on the in-vivo measurement signals, successive values of a hemoglobin measure indicative of hemoglobin concentration in the blood of the subject; and a third program product portion configured to indicate, based on the successive values, blood volume status of the subject.
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Specification