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Autonomous and Rechargeable Microneurostimulator Endoscopically Implantable into the Submucosa

Autonomous and Rechargeable Microneurostimulator Endoscopically Implantable into the Submucosa

Published on: September 27, 2018

A microwave powered injectable neural stimulator.

Bruce C Towe¹, Patrick J Larson, Daniel W Gulick

¹Harrington Biomedical Engineering, School of Biological and Health Systems Engineering, Arizona State University, USA.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|February 1, 2013

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A simple wireless neurostimulation device using microwave energy can be injected into tissue. This implantable system successfully stimulated rat sciatic nerves wirelessly from a distance, showing potential for minimally invasive neural interfacing.

Area of Science:

Biomedical Engineering
Neuroscience
Microwave Engineering

Background:

Wireless neurostimulation offers a minimally invasive alternative to wired implants.
Existing wireless systems often face challenges with power delivery and device size.
Developing injectable and wirelessly powered neurostimulators is a key goal in neural interfacing.

Purpose of the Study:

To develop and evaluate a simple, injectable wireless neurostimulation device.
To assess the feasibility of using pulsed microwave energy for neural activation.
To determine the effective range and limitations of microwave-driven neurostimulation.

Main Methods:

Fabrication of a 1 cm long implantable device with a platinum wire antenna, Schottky diode, and polyimide tubing.

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Last Updated: May 14, 2026

Autonomous and Rechargeable Microneurostimulator Endoscopically Implantable into the Submucosa

Autonomous and Rechargeable Microneurostimulator Endoscopically Implantable into the Submucosa

Published on: September 27, 2018

Microinjectrode System for Combined Drug Infusion and Electrophysiology

Microinjectrode System for Combined Drug Infusion and Electrophysiology

Published on: November 13, 2019

Chronic implantation of the device adjacent to the rat sciatic nerve.

Utilizing a 915 MHz pulsed microwave transmitter to deliver energy and assess motor responses.

Main Results:

The injectable device achieved wireless neurostimulation of the rat sciatic nerve.
Successful motor event stimulation was observed from up to 7 cm away from the body surface.
Tissue models demonstrated the capability to deliver milliampere pulsed currents through over 5 cm of tissue.

Conclusions:

A simple, injectable device can achieve wireless neurostimulation using microwave energy.
This approach shows promise for minimally invasive neural interfacing, though depth is limited by SAR.
Further research is needed to optimize power delivery and expand functional tissue depth.