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Liquid Viscosity Sensor Using a Surface Acoustic Wave Device for Medical Applications Including Blood and Plasma.

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Summary

This study presents a novel surface acoustic wave device for real-time blood viscosity monitoring. The new sensor utilizes a bi-layer waveguide for enhanced sensitivity, offering a promising tool for hyperviscosity syndrome management.

Keywords:
SH-SAWZnOpiezoelectric thin-filmquartzsurface acoustic waveswaveguide

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Sensor Technology

Background:

  • Blood viscosity is a critical indicator for hyperviscosity syndrome.
  • Current monitoring methods may lack real-time capabilities.
  • Surface acoustic wave (SAW) devices offer potential for sensitive liquid sensing.

Purpose of the Study:

  • To develop an alternative approach for real-time blood viscosity monitoring.
  • To investigate the use of a novel bi-layer waveguide on a SAW device.
  • To enhance the sensitivity and precision of SAW-based viscosity measurements.

Main Methods:

  • Fabrication of a novel bi-layer waveguide (Parylene C/Zinc Oxide) on a SAW device.
  • Utilizing the device for real-time sensing of liquid droplets at room temperature.
  • Experimental testing and finite element analysis (FEA) to evaluate device performance.

Main Results:

  • The bi-layer waveguide (Parylene C/ZnO) successfully promoted the surface horizontal mode.
  • FEA confirmed a 9-fold increase in local particle displacement (1.261 nm to 11.353 nm) with the bi-layer structure.
  • The device achieved a high sensitivity of 3.57 ± 0.3125 kHz/cP for viscosity measurement.

Conclusions:

  • The novel bi-layer waveguide significantly enhances SAW device performance for liquid sensing.
  • The developed SAW device demonstrates high precision and potential for real-time blood viscosity monitoring.
  • This technology could improve the management of hyperviscosity syndrome.