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Exploitation of blood non-Newtonian properties for ultrasonic measurement of hematocrit

Authors
  • Pialot, B.1, 2, 3
  • Gachelin, J.3
  • Provost, J.4
  • Couture, O.1
  • 1 Sorbonne Université, CNRS, INSERM, Laboratoire d’Imagerie Biomédicale, Paris, France , Paris (France)
  • 2 ESPCI, CNRS, INSERM, PhysMedParis, Paris, France , Paris (France)
  • 3 Aenitis Technologies, Paris, France , Paris (France)
  • 4 Polytechnique Montréal, Montréal, Canada , Montréal (Canada)
Type
Published Article
Journal
Scientific Reports
Publisher
Springer Nature
Publication Date
May 13, 2021
Volume
11
Issue
1
Identifiers
DOI: 10.1038/s41598-021-89704-4
Source
Springer Nature
License
Green

Abstract

New processing techniques for manipulating blood and its components at a microfluidic scale are currently implemented. As for extracorporeal circulation, the in-line evaluation and monitoring of blood properties during these microfluidic techniques is a challenging task. Here, we show that the blood hematocrit can be measured non-invasively in a sub-millimeter medical tube using the non-Newtonian behavior of blood velocity profile. This hematocrit measurement is demonstrated on human blood with a simple Doppler ultrasound system. Results show a mean measurement error of 4.6 ± 1.3%Hct for hematocrit up to 52% and for 5 s-long ultrasonic signals. The simplicity and the measurement scale of the approach make it highly valuable for measuring hematocrit in new blood separation techniques. The approach may have an impact on in-vitro blood processing in general.

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