Magnetoelectric Materials for Miniature, Wireless Neural Stimulation at Therapeutic Frequencies

Area of Science:

• Bioelectronics
• Materials Science
• Neuroscience

Background:

• Wireless power delivery to miniature bioelectronics deep within the body is a significant challenge.
• Existing methods like electromagnetic or ultrasound waves face absorption and impedance issues at biological interfaces.
• Current magnetically powered implants using induction or magnetothermal effects lack miniature stimulators operating at clinically relevant high frequencies.

Purpose of the Study:

• To introduce a novel wireless power method using magnetoelectric (ME) materials for miniature neural stimulators.
• To demonstrate ME-based neural stimulators capable of operating at frequencies exceeding 100 Hz.
• To evaluate the efficacy of these wireless ME stimulators for therapeutic deep brain stimulation.

Main Methods:

• Development of miniature neural stimulators powered wirelessly using magnetoelectric materials.
• Testing of device performance at frequencies relevant for clinical applications (>100 Hz).
• In vivo demonstration of therapeutic deep brain stimulation in a rodent model of Parkinson's disease.

Main Results:

• Magnetoelectric materials enable miniature magnetically powered neural stimulators operating at clinically relevant frequencies (>100 Hz).
• Wireless ME stimulators successfully delivered therapeutic deep brain stimulation in a freely moving rodent model.
• Devices were successfully miniaturized to millimeter scale and demonstrated feasibility for full implantation.

Conclusions:

• Magnetoelectric materials offer a promising solution for wireless power delivery in miniature bioelectronics.
• This technology enables high-frequency neural stimulation, crucial for advanced therapeutic applications.
• ME materials are well-suited for developing next-generation miniature bioelectronic devices for clinical and research use.