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Giant Magnetoelastic Effect Enabled Stretchable Sensor for Self-Powered Biomonitoring.

Xun Zhao1, Guorui Chen1, Yihao Zhou1

  • 1Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States.

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Summary

This study introduces a waterproof, stretchable biomechanical sensor for healthcare. The self-powered device uses a giant magnetoelastic effect for accurate cardiovascular monitoring in wearable and implantable applications.

Keywords:
MEG, biomonitoringbioelectronicsgiant magnetoelastic effectmagnetoelastic generator

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Soft Robotics

Background:

  • Wearable and implantable bioelectronics face challenges in humidity resistance, stretchability, durability, and biocompatibility, hindering clinical adoption.
  • Existing devices often require external power sources and lack robust performance in physiological environments.

Purpose of the Study:

  • To develop a self-powered, waterproof biomechanical sensor with enhanced stretchability and durability for reliable biomonitoring.
  • To demonstrate the sensor's capability for cardiovascular monitoring and disease diagnosis using the giant magnetoelastic effect.

Main Methods:

  • Fabrication of a soft polymer-based sensor utilizing the giant magnetoelastic effect.
  • Manipulation of magnetic dipole alignment to achieve a wide sensing range and rapid response time.
  • Validation through ex vivo porcine heart testing and in vivo Sprague-Dawley rat models for cardiovascular monitoring.

Main Results:

  • The sensor exhibits 440% stretchability and operates across an ultrawide sensing range (3.5 Pa to 2000 kPa) with a response time of ~3 ms.
  • Successful detection of ventricular arrhythmia and fibrillation in a rat model, demonstrating effective cardiovascular monitoring.
  • The sensor shows minimal hysteresis, waterproofness, and biocompatibility.

Conclusions:

  • The developed magnetoelastic sensor offers a robust, self-powered platform for advanced biomonitoring.
  • Its unique properties address key limitations of current bioelectronic devices for both wearable and implantable applications.
  • This technology holds significant potential for improved healthcare monitoring and diagnostics.