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

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.