Battery-Free, Wireless, Cuff-Type, Multimodal Physical Sensor for Continuous Temperature and Strain Monitoring of...

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Implantable Sensors

Background:

• Peripheral nerve injuries result in significant motor and sensory deficits.
• Surgical interventions are common but lack continuous functional recovery monitoring.
• Effective in vivo nerve monitoring remains a critical unmet need.

Purpose of the Study:

• To develop a battery-free, wireless, implantable sensor platform for continuous in vivo monitoring of temperature and strain in injured peripheral nerves.
• To assess the performance and feasibility of the developed sensing system for nerve regeneration monitoring.

Main Methods:

• A cuff-type, multimodal physical sensing platform with thin, soft temperature and strain sensors was designed and fabricated.
• The platform incorporates power harvesting and wireless data communication capabilities.
• Sensor performance was evaluated for sensitivity, stability, linearity, and hysteresis; strain sensor included temperature compensation circuits.
• Feasibility and stability were validated through experimental evaluations and numerical simulations in animal models.

Main Results:

• The developed sensors demonstrated high sensitivity, excellent stability, linearity, and minimal hysteresis within relevant physiological ranges.
• The temperature-compensated strain sensor provided accurate and reliable measurements with negligible temperature dependence.
• The wireless, battery-free system successfully enabled continuous in vivo monitoring of nerve temperature and strain.
• Animal tests confirmed the feasibility and stability of the sensor system for monitoring nerve regeneration.

Conclusions:

• The introduced battery-free, wireless, implantable sensing platform is a viable tool for continuous in vivo monitoring of injured peripheral nerves.
• This technology has significant potential for early-stage and ongoing monitoring throughout the nerve regeneration process.
• The system can provide crucial data to guide treatment and improve functional outcomes after nerve injury.