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Method and system for non-invasive measurements in a human body

a technology of human body and non-invasive measurement, applied in the direction of diagnostics, pressure, sensors, etc., can solve the problems of limited accuracy of known photo-acoustic and impedance methods, and achieve the effect of facilitating non-invasive measurements and limited accuracy

Inactive Publication Date: 2007-04-05
ORSENSE LTD
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  • Abstract
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  • Application Information

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Benefits of technology

[0019] Despite their potential, the known photo-acoustic and impedance methods suffer from limited accuracy. The present invention facilitates non-invasive measurements in a human body by providing a novel method and device for measuring time variations of a response of the blood perfused fleshy medium (e.g., finger) to an external electromagnetic field. It should be understood that measuring of the response from blood may be aimned at determining blood-related parameter(s), or may be aimed at determining tissue-related parameter(s) in which case “blood” response presents a “noise” part and is determined to be extracted from the entire measured signal.

Problems solved by technology

Despite their potential, the known photo-acoustic and impedance methods suffer from limited accuracy.

Method used

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Embodiment Construction

[0047] The principles and operation of the system and method for non-invasive measurement of blood parameters according to the present invention may be better understood with reference to the drawings and the accompanying description, it being understood that these drawings and examples in the description are given for illustrative purposes only and are not meant to be limiting. The same reference Roman numerals and alphabetic characters will be utilized for identifying those components which are common in the system for non-invasive measurement of blood parameters shown in the drawings throughout the present description of the invention.

[0048] According to one general aspect, the present invention provides a novel method for non-invasive electromagnetic scattering determination of glucose. It should be understood that the present invention is not limited to the measurement of blood glucose levels, but may also be utilized to measure other blood characteristics. Examples of the blo...

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Abstract

A method and system are presented for use in non-invasive measurements in a patient's body. A condition of artificial blood kinetics is created at a measurement location in a patient's blood perfused fleshy medium, and this condition is maintained for a certain time period. An external electromagnetic field is applied to the measurement location while under the condition of artificial blood kinetics. A time variation of a response of the blood perfused fleshy medium to this external electromagnetic field is detected, and measured data indicative thereof is generated. The response of the medium can be a photo-acoustic signal obtained in response to incident light, and / or impedance of the medium in response to the applied ac electromagnetic field.

Description

FIELD OF THE INVENTION [0001] This invention relates to techniques for non-invasive measurements in a human body, and in particular, to a method and system for measuring blood characteristics by photo-acoustic and electrical measurement techniques. BACKGROUND OF THE INVENTION [0002] Non-invasive techniques for measuring various blood parameters, e.g. the concentration of glucose in blood, blood oxygen saturation, etc. have become very popular, since they do not require the withdrawal of a blood sample from a patient's body. One approach for non-invasively determining the composition of blood makes use of the interaction of electromagnetic radiation with the blood under examination. It is known that electromagnetic radiation having appropriate characteristics may interact with blood in two primary ways. As it passes through a fleshy medium, the radiation is scattered and a portion of it will be absorbed. Different chemical species of the blood scatter and absorb to different degrees ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61B5/00A61B5/05G01N29/24
CPCA61B5/0048A61B5/0095A61B5/14532G01N29/2418G01N2291/02466A61B5/0053
Inventor FINE, ILYAFINAROV, ALEXANDERGANDELMAN, IOSEFFIKHTE, BORIS
Owner ORSENSE LTD
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