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Updated: Aug 15, 2026
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Autonomous and Rechargeable Microneurostimulator Endoscopically Implantable into the Submucosa
Published on: September 27, 2018
Two-way communication for programming and measurement in a miniature implantable stimulator
M A Thil1, B Gérard, J C Jarvis
1Neural Rehabilitation Engineering Laboratory, Université Catholique de Louvain, Medical School, Brussels, Belgium.
Medical & Biological Engineering & Computing
|November 1, 2005
Summary
A new miniature implantable stimulator uses microcontrollers for nerve and muscle stimulation. It features a novel biocompatible encapsulation and an in-vivo impedance monitoring system for chronic studies.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Implantable Devices
Background:
- Chronic electrical stimulation requires reliable implantable devices.
- Existing devices often lack integrated monitoring capabilities.
- Biocompatibility and ease of implantation are critical for long-term use.
Purpose of the Study:
- To develop a versatile, miniature implantable stimulator for experimental research.
- To introduce a novel biocompatible encapsulation method.
- To implement a system for real-time monitoring of electrode impedance in awake animals.
Main Methods:
- Utilized a programmable integrated circuit (PIC) for stimulation control and communication.
- Developed a novel encapsulation technique using silicone and Teflon for biocompatibility.
- Implemented a method to measure electrode impedance by analyzing voltage during constant-current pulses, with results conveyed via muscle twitches.
Main Results:
- Successfully tested the neurostimulator in vitro and in vivo.
- Demonstrated chronic monitoring of thresholds and impedance values with a self-sizing spiral cuff electrode.
- Observed impedance variations that correlate with post-implantation morphological changes.
Conclusions:
- The developed implantable stimulator is a versatile and effective tool for chronic nerve and muscle stimulation.
- The novel encapsulation method ensures biocompatibility for extended implantation periods.
- The integrated impedance monitoring system allows for real-time assessment of the nerve-electrode interface, enabling adaptive stimulation parameter adjustments.
