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Updated: Sep 25, 2025

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Micro-particle entrapment dynamics in microfluidic pulmonary capillary networks.

Merav Belenkovich1, Josué Sznitman1, Netanel Korin1

  • 1Faculty of Biomedical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.

Journal of Biomechanics
|April 30, 2022
PubMed
Summary

Micro-particles navigating the pulmonary capillary network can get trapped. Red blood cells surprisingly aid larger micro-particle transport, reducing entrapment in this key vascular network.

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Research
  • Microfluidics

Background:

  • Vascular targeted carriers (VTCs) face complex transport challenges in the circulatory system.
  • The pulmonary capillary network (PCN) poses a risk of particle entrapment and blockage.
  • Understanding micro-particle behavior in capillaries is crucial for VTC design.

Purpose of the Study:

  • To investigate micro-particle entrapment dynamics in a microfluidic pulmonary capillary network (PCN) model.
  • To analyze the influence of particle size and red blood cell (RBC) presence on capillary transport.
  • To explore the role of biophysical interactions in VTC navigation.

Main Methods:

  • Development of a microfluidic PCN model simulating human physiological hemodynamics at true scale.
Keywords:
Blood capillariesDrug carriersMicrofluidicsParticle entrapmentRed blood cells

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  • In vitro experiments using spherical micro-particles (3, 4, and 4.5 µm) at varying concentrations.
  • Comparison of particle motion in cell-free buffer versus in the presence of red blood cells (RBCs).

    • Main Results:

    • 3 µm particles showed undisturbed transport regardless of concentration or RBC presence.
    • 4 and 4.5 µm particles exhibited concentration-dependent transport.
    • The presence of RBCs reduced entrapment for larger micro-particles (4 and 4.5 µm).

    Conclusions:

    • Collisions with RBCs can enhance micro-particle navigability, preventing capillary entrapment.
    • This study provides a preclinical in vitro assay for optimizing VTC design.
    • Findings offer insights into carrier transport within narrow capillary networks.