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Principles around Accurate Blood Volume Collection Using Capillary Action.

Florian Lapierre1,2, Andrew Gooley1,3, Michael Breadmore1,2

  • 1ASTech, ARCTraining Centre for Portable Analytical Separation Technologies, University of Tasmania , Private Bag 75, Hobart, Tasmania 7001, Australia.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 22, 2017
PubMed
Summary

This study explores how glass surface aging and blood hematocrit affect capillary rise in microfluidic devices. Findings help optimize capillary tube dimensions for accurate blood volume collection in personalized biomedical tools.

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Area of Science:

  • Biomedical Engineering
  • Fluid Dynamics
  • Materials Science

Background:

  • Capillary action enables autonomous liquid transport in microfluidics, crucial for developing user-friendly biomedical tools.
  • Precision bore glass capillaries offer high accuracy for liquid volumes, but optimal dimensions are key for efficient capillary action.
  • Understanding factors influencing liquid rise is essential for reliable microfluidic device performance.

Purpose of the Study:

  • To investigate the impact of glass surface aging and hematocrit levels on blood capillary rise.
  • To provide guidelines for selecting optimal capillary dimensions for accurate blood volume collection.
  • To enhance the development of personalized, low-cost biomedical devices utilizing capillary action.

Main Methods:

  • Experimental analysis of capillary rise in glass tubes under varying conditions.
  • Controlled exposure of glass surfaces to humid air to simulate aging.
  • Testing with blood samples of different hematocrit levels.
  • Mathematical modeling to determine optimal capillary dimensions.

Main Results:

  • Glass surface aging significantly influences capillary rise height and blood volume collected.
  • Hematocrit levels directly correlate with the extent of capillary rise.
  • Optimum capillary height and radius were determined for accurate blood sample acquisition.
  • Deviations from optimal dimensions lead to inaccuracies in volume measurement.

Conclusions:

  • Surface aging and hematocrit are critical parameters affecting blood capillary rise in microfluidic devices.
  • The study provides a framework for designing glass capillary tubes for precise blood volume measurement.
  • These findings contribute to the advancement of affordable and accessible personalized diagnostic tools.