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Proceedings Paper

Multiwavelength pulse oximetry in the measurement of hemoglobin fractions
Author(s): Bernd Manzke; Johannes Schwider; Norbert O. Lutter; Kai Engelhardt; Wilhelm Stork
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Paper Abstract

The two wavelength design of the majority of pulse oximeters assumes only two absorbing hemoglobin fractions, oxyhemoglobin (O2Hb), and reduced hemoglobin (HHb) irrespective of the presence of methemoglobin (MetHb) and carboxyhemoglobin (COHb). If MetHb or COHb is present, it contributes to the pulse-added absorbance signal and will be interpreted as either HHb or O2Hb or some combination of the two. In this paper we describe a noninvasive multi-wavelength pulse oximeter measuring O2Hb, HHb, MetHb, and COHb at a specified accuracy of 1.0%. The system was designed with respect to the results of numerical simulations. It consists of 9 laserdiodes (LDs) and 7 light emitting diodes (LEDs), a 16-bit analog-digital converter (ADC) and has a sampling rate of 16 kHz. The laser didoes and LEDs were coupled into multi-mode fibers and led with a liquid lightguide to the finger clip and then the photodiode. It also presents the results of a clinical study, including a setup with a quartz tungsten halogen lamp (with fiber output) and a diode array spectrometer, a standard pulse oximeter and two in-vitro oximeters (radiometer OSM3 and radiometer ABL 520) as references.

Paper Details

Date Published: 24 April 1996
PDF: 9 pages
Proc. SPIE 2676, Biomedical Sensing, Imaging, and Tracking Technologies I, (24 April 1996); doi: 10.1117/12.238813
Show Author Affiliations
Bernd Manzke, Univ. Erlangen-Nuernberg (Germany)
Johannes Schwider, Univ. Erlangen-Nuernberg (Germany)
Norbert O. Lutter, Univ. Erlangen-Nuernberg (Germany)
Kai Engelhardt, Univ. Erlangen-Nuernberg (Germany)
Wilhelm Stork, Univ. Karlsruhe (Germany)

Published in SPIE Proceedings Vol. 2676:
Biomedical Sensing, Imaging, and Tracking Technologies I
Robert A. Lieberman; Halina Podbielska M.D.; Tuan Vo-Dinh, Editor(s)

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