A scalable, and tunable braided yarn for micro and macro physiological sensing

Area of Science:

• Materials Science
• Wearable Technology
• Biomedical Engineering

Background:

• Future wearables require integrated sensing for vital signs and biomechanics.
• Current challenges include balancing imperceptible sensing with seamless integration for durable, personalized solutions.

Purpose of the Study:

• To report an ultra-thin, miniaturized, capacitive braided composite yarn (CBCY) for scalable micro and macro sensing.
• To demonstrate its conformability, robustness, and seamless integration into flexible surfaces.
• To provide guidelines for diverse use cases and evaluate performance in wearable applications.

Main Methods:

• Advanced braiding and winding techniques were used to create the capacitive braided composite yarn (CBCY).
• Sensor capabilities were characterized.
• Two wearable applications were designed: human respiration monitoring (micro-sensing) and elbow movement tracking (macro-sensing).

Main Results:

• The developed CBCY is ultra-thin, miniaturized, conformable, and robust.
• It is scalable and tunable for both micro and macro sensing applications.
• Successful demonstration in monitoring human respiration and elbow movements.

Conclusions:

• The CBCY offers a novel solution for wearable designers, enabling imperceptible comfort.
• It facilitates the unification of sensors and electronics for future smart textile applications.
• The sensor is suitable for diverse micro and macro sensing needs in daily environments.