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Development of a Wireless Telemetry Sensor Device to Measure Load and Deformation in Orthopaedic Applications.

William D Anderson1, Sydney L M Wilson1, David W Holdsworth1,2,3,4

  • 1School of Biomedical Engineering, Western University, London, ON N6A 3K7, Canada.

Sensors (Basel, Switzerland)
|December 2, 2020
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Summary

Researchers repurposed a miniature tire-pressure sensor for in-vivo load and deformation measurements in orthopaedic applications. This novel approach enables precise monitoring in small, deformable environments.

Keywords:
accelerometercapacitive transducersdeformationload sensororthopaedic implantspressure sensorsstraintelemetrywireless

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Area of Science:

  • Biomedical Engineering
  • Orthopaedic Biomechanics
  • Sensor Technology

Background:

  • Current in-vivo load and deformation measurements are limited by sensor size and circuitry, restricting use to larger orthopaedic implants.
  • There is a need for miniature, wireless sensors capable of measuring load and deformation in smaller biomedical applications.

Purpose of the Study:

  • To repurpose a commercial low-power, miniature, wireless, telemetric tire-pressure sensor (FXTH87) for in-vivo load and deformation measurements.
  • To evaluate the sensor's performance in a deformable enclosure for potential orthopaedic and biomedical applications.

Main Methods:

  • Modification of the capacitive transducer membrane of the FXTH87 sensor.
  • Application of compressive deformation to determine sensor signal value and internal resistive force.
  • Embedding the sensor package within a deformable enclosure to simulate application conditions.

Main Results:

  • A compressive deformation of 350 ± 24 µm was required to reach the sensor's maximum output signal.
  • The sensor's output signal effectively predicted applied load (up to 35 N) on a calibrated plastic strain member.
  • The sensor demonstrated sensitivity and precision in monitoring load-induced deformations within the tested range.

Conclusions:

  • The repurposed FXTH87 sensor is a viable tool for monitoring load and deformation in small-scale, deformable biomedical applications.
  • The sensor offers a sensitive and precise method for in-vivo measurements, overcoming previous size limitations.
  • Further research can explore its integration into various orthopaedic implants and devices.