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A surface acoustic wave ICP sensor with good temperature stability.

Bing Zhang1, Hong Hu1, Aipeng Ye2

  • 1Department of Mechanical Engineering and Automation, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, Guangdong, China.

Technology and Health Care : Official Journal of the European Society for Engineering and Medicine
|June 7, 2017
PubMed
Summary

This study introduces a novel surface acoustic wave (SAW) pressure sensor for wireless intracranial pressure (ICP) monitoring. Differential temperature compensation significantly improves sensor stability, crucial for patient care.

Keywords:
COM theoryICP monitoringdifferential temperature compensationsurface acoustic wave sensor

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Area of Science:

  • Sensor Technology
  • Biomedical Engineering
  • Materials Science

Background:

  • Intracranial pressure (ICP) monitoring is vital for managing conditions like hydrocephalus, head trauma, and hypertension.
  • Elevated ICP can lead to severe neurological damage; monitoring aids in timely intervention.
  • Effective ICP monitoring can reduce mortality rates by enabling preventative measures against brain damage.

Purpose of the Study:

  • To develop a wireless, passive surface acoustic wave (SAW) pressure sensor for intracranial pressure (ICP) monitoring.
  • To enhance the temperature stability of the SAW pressure sensor for reliable ICP measurements.
  • To validate the sensor's performance through fabrication and experimental testing.

Main Methods:

  • Utilized ST cut quartz as the sensor substrate for inherent temperature stability.
  • Implemented a differential temperature compensation method to mitigate thermal effects.
  • Designed and fabricated two resonators based on coupling of mode (COM) theory, verified with a dedicated pressure and temperature testing system.

Main Results:

  • The fabricated sensor demonstrated a linearity of 2.63%.
  • The sensor exhibited a hysteresis of 1.77%.
  • Experimental results confirmed improved temperature stability due to the differential compensation method.

Conclusions:

  • The differential temperature compensation method effectively enhances the temperature stability of the SAW pressure sensor.
  • The proposed sensor design is validated as a viable tool for wireless ICP monitoring.
  • The improved stability ensures more reliable and accurate ICP measurements in clinical applications.