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Impedance-based real-time position sensor for lab-on-a-chip devices.

B Brazey1, J Cottet, A Bolopion

  • 1FEMTO-ST Institute, AS2M Department, Univ. de Bourgogne Franche-Comté CNRS, 24 rue Savary, F-25000 Besançon, France. benoit.brazey@femto-st.fr.

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|February 14, 2018
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Summary
This summary is machine-generated.

This study introduces an integrated impedance-based sensor for real-time cell tracking in lab-on-a-chip devices. This novel sensor overcomes limitations of vision-based systems for single cell analysis.

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Area of Science:

  • Microfluidics
  • Biomedical Engineering
  • Sensor Technology

Background:

  • Single cell analysis is crucial for biological research, demanding real-time monitoring of cell movement within microfluidic devices.
  • Traditional vision-based sensors are inadequate for tracking numerous cells simultaneously in lab-on-a-chip systems.
  • Existing methods lack the integration and real-time capabilities required for dynamic cell manipulation.

Purpose of the Study:

  • To develop and validate an integrated position sensor for lab-on-a-chip devices using impedance measurements.
  • To provide a real-time, high-sampling-rate alternative to vision-based sensors for monitoring cell displacement.
  • To demonstrate the feasibility of position-sensitive impedance sensing for single cell analysis.

Main Methods:

  • Developed an integrated sensor based on impedance variation measured between two electrodes within a microfluidic channel.
  • Designed chip electrodes for compatibility with dielectrophoresis actuation and improved measurement sensitivity and repeatability.
  • Implemented an extended Kalman filter to address real-time detection challenges in noisy environments.

Main Results:

  • Successfully demonstrated position-sensitive impedance sensing for determining the longitudinal position of microparticles.
  • Achieved real-time tracking of 8.7 μm diameter beads in a 1D channel.
  • Validated the sensor's potential for high-throughput, integrated cell monitoring.

Conclusions:

  • Integrated impedance sensing offers a viable, real-time solution for monitoring cell positions in lab-on-a-chip devices.
  • The developed sensor technology is compatible with microfluidic fabrication processes and dielectrophoresis.
  • This approach enhances the capabilities for advanced single cell analysis and manipulation.