Development of a Wearable Electromyographic Sensor with Aerosol Jet Printing Technology

Area of Science:

• Biomedical Engineering
• Materials Science
• Wearable Technology

Background:

• Traditional electromyographic (EMG) sensors face challenges like motion artifacts, signal variability, and poor wearability.
• These limitations hinder accurate muscle activity analysis in various applications.

Purpose of the Study:

• To develop a novel EMG sensor using Aerosol Jet Printing (AJP) technology.
• To enhance sensor precision, flexibility, and signal stability.
• To improve wearability and user comfort for long-term monitoring.

Main Methods:

• Fabrication of EMG sensors using Aerosol Jet Printing (AJP) on flexible substrates.
• Minimizing air interposition at the skin-electrode interface for better signal quality.
• Comparative performance testing against commercial EMG sensors, including impedance stability under mechanical stress.
• Physiological validation on a human participant during rest and voluntary muscle contractions.

Main Results:

• The AJP-fabricated sensor demonstrated superior impedance stability across frequencies, even under mechanical stress, compared to commercial sensors.
• The novel design achieved enhanced flexibility and conformability, improving wearability.
• Physiological validation confirmed accurate capture of muscle activity, differentiating between low and high activity states.

Conclusions:

• Aerosol Jet Printing (AJP) is a viable technology for creating high-performance, wearable EMG sensors.
• The developed sensor offers a promising solution for improving muscle activity monitoring in clinical diagnostics, rehabilitation, and sports performance.
• This work paves the way for future advancements in miniaturized, strain-insensitive, and widely deployable EMG sensor technology.