Examiner’s finger-mounted fetal tissue oximetry

Naohiro Kanayama; Masatsugu Niwayama

doi:10.1117/1.JBO.19.6.067008

24 June 2014 Examiner’s finger-mounted fetal tissue oximetry

Naohiro Kanayama, Masatsugu Niwayama

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Journal of Biomedical Optics, Vol. 19, Issue 6, 067008 (June 2014). https://doi.org/10.1117/1.JBO.19.6.067008

Abstract

The best way to assess fetal condition is to observe the oxygen status of the fetus (as well as to assess the condition of infants, children, and adults). Previously, several fetal oximeters have been developed; however, no instrument has been utilized in clinical practice because of the low-capturing rate of the fetal oxygen saturation. To overcome the problem, we developed a doctor’s finger-mounted fetal tissue oximeter, whose sensor volume is one hundredth of the conventional one. Additionally, we prepared transparent gloves. The calculation algorithm of the hemoglobin concentration was derived from the light propagation analysis based on the transport theory. We measured neonatal and fetal oxygen saturation (StO₂) with the new tissue oximeter. Neonatal StO₂ was measured at any position of the head regardless of amount of hair. Neonatal StO₂ was found to be around 77%. Fetal StO₂ was detected in every position of the fetal head during labor regardless of the presence of labor pain. Fetal StO₂ without labor pain was around 70% in the first stage of labor and around 60% in the second stage of labor. We concluded that our new concept of fetal tissue oximetry would be useful for detecting fetal StO₂ in any condition of the fetus.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Naohiro Kanayama and Masatsugu Niwayama "Examiner’s finger-mounted fetal tissue oximetry," Journal of Biomedical Optics 19(6), 067008 (24 June 2014). https://doi.org/10.1117/1.JBO.19.6.067008

Published: 24 June 2014

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