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Red Blood Cell Partitioning Using a Microfluidic Channel with Ladder Structure.

Toru Hyakutake1, Yuya Tsutsumi2, Yohei Miyoshi2

  • 1Faculty of Engineering, Yokohama National University, 79-5 Hodogaya, Yokohama 240-8501, Japan.

Micromachines
|July 29, 2023
PubMed
Summary

Red blood cell (RBC) distribution in capillary ladder structures is influenced by channel width and branch spacing. Narrower channels and closer branches increase RBC heterogeneity, impacting blood flow and oxygen delivery.

Keywords:
capillary networkmicrofluidic channelpartitioningred blood cell

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Area of Science:

  • Biophysics
  • Physiology
  • Microfluidics

Background:

  • Capillary networks are crucial for tissue oxygenation.
  • Red blood cell (RBC) partitioning in microvessels affects blood flow and oxygen delivery.
  • Understanding RBC behavior in complex microstructures is vital for diagnosing circulatory diseases.

Purpose of the Study:

  • To investigate red blood cell (RBC) partitioning in capillary ladder structures.
  • To evaluate the impact of parent channel width, branch distance, and hematocrit on RBC distribution.
  • To understand the physiological mechanisms of RBC phase separation in microcirculation.

Main Methods:

  • In vitro experiments using microfluidic channels with a six-bifurcating ladder structure.
  • Simulated anti-parallel flow configuration.
  • Systematic variation of parent channel width, distance between branches, and hematocrit.

Main Results:

  • Decreased parent channel width increased hematocrit distribution heterogeneity and biased fractional RBC flux.
  • Smaller distances between branches led to greater RBC distribution heterogeneity.
  • RBC distribution bias within the microchannel cross-section significantly affected partitioning.
  • Lower hematocrit values resulted in a more pronounced bias in RBC distribution.

Conclusions:

  • RBC partitioning in capillary ladder structures is sensitive to geometric parameters and hematocrit.
  • Findings provide insights into RBC phase separation in microcirculation.
  • This research can help predict tissue oxygen heterogeneity and inform studies of microcirculatory diseases.