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A microfluidic chip with a serpentine channel enabling high-throughput cell separation using surface acoustic waves.

Shupeng Ning1,2, Shuchang Liu1,2, Yunjie Xiao3

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Summary

This study introduces a novel acoustofluidic device for rapid bacterial separation from blood, improving sepsis diagnosis. The high-throughput device uses acoustic waves and a serpentine design for efficient pathogen detection at the point of care.

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Acoustic Technology

Background:

  • Sepsis diagnosis relies on timely pathogen detection, but traditional methods are slow.
  • Current pre-separation techniques for blood pathogens have limited processing capacity due to low flow rate requirements.

Purpose of the Study:

  • To develop a high-throughput acoustofluidic device for efficient bacterial separation from human blood cells.
  • To overcome the limitations of existing methods for rapid sepsis diagnosis.

Main Methods:

  • Utilized a serpentine microfluidic design combined with standing surface acoustic waves (SSAWs).
  • Separated bacteria from blood cells based on size differences using acoustic forces.
  • Integrated spatial multiplexing and pressure node matching for enhanced acoustic field operation within a compact device.

Main Results:

  • Achieved effective bacterial separation from blood cells with high purity and cell recovery.
  • Demonstrated improved flow rates of 2.6 μL/min for blood samples at approximately 3 cm/s velocity.
  • Validated the device's performance through microscopic observation and flow cytometry analysis.

Conclusions:

  • The acoustofluidic device offers a high-throughput, label-free solution for bacterial separation.
  • The serpentine microfluidic design enhances efficiency and is compatible with point-of-care diagnostic platforms.
  • This technology shows promise for rapid sepsis diagnosis and clinical utility.