Mr. Sergej M. Andruschenko Profile

Sergej M. Andruschenko

at Univ Rostock

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Proceedings Article | 26 February 2010 Paper

Optical sensor technology for a noninvasive continuous monitoring of blood components

Jens Kraitl, Ulrich Timm, Elfed Lewis, Hartmut Ewald

Proceedings Volume 7572, 757209 (2010) https://doi.org/10.1117/12.843153

KEYWORDS: Blood, Oxygen, Tissue optics, Sensors, Absorption, Tissues, Signal detection, Light emitting diodes, Plasma, Absorbance

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NIR-spectroscopy and Photoplethysmography (PPG) is used for a measurement of blood components. The absorptioncoefficient of blood differs at different wavelengths. This fact is used to calculate the optical absorbability characteristics of blood which is yielding information about blood components like hemoglobin (Hb), carboxyhemoglobin (CoHb) and arterial oxygen saturation (SpO2). The measured PPG time signals and the ratio between the peak to peak pulse amplitudes are used for a measurement of these parameters. Hemoglobin is the main component of red blood cells. The primary function of Hb is the transport of oxygen from the lungs to the tissue and carbon dioxide back to the lungs. The Hb concentration in human blood is an important parameter in evaluating the physiological status of an individual and an essential parameter in every blood count. Currently, invasive methods are used to measure the Hb concentration, whereby blood is taken from the patient and subsequently analyzed. Apart from the discomfort of drawing blood samples, an added disadvantage of this method is the delay between the blood collection and its analysis, which does not allow real time patient monitoring in critical situations. A noninvasive method allows pain free continuous on-line patient monitoring with minimum risk of infection and facilitates real time data monitoring allowing immediate clinical reaction to the measured data.

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