A Versatile Hermetically Sealed Microelectronic Implant for Peripheral Nerve Stimulation Applications.

Area of Science:

• Biomedical Engineering
• Neuroscience
• Implantable Devices

Background:

• Chronic experimental studies with freely moving large animal models are crucial for understanding peripheral nerve function.
• Existing neurostimulation systems often face limitations in terms of implant size, power supply, and channel flexibility.

Purpose of the Study:

• To present a versatile, fully implantable multi-channel neural stimulator for chronic peripheral nerve studies.
• To demonstrate the device's reliability and performance in accelerated aging tests and in vitro evaluations.

Main Methods:

• Development of a hermetically sealed, multi-channel neural stimulator using 0.6-μm CMOS technology.
• Implementation of a crosstalk reduction scheme and high-speed telemetry for battery-less operation.
• Integration with a wearable transmitter (Bluetooth Low Energy) and a custom GUI for remote control.

Main Results:

• The implant successfully passed accelerated aging tests at 100°C for 15 days.
• The system supports independent stimulation on three channels, with multiplexing enabling up to 36 unique electrode pair configurations.
• Demonstrated low cross-channel interference and reliable electrical performance in vitro.

Conclusions:

• The developed neurostimulation platform is a versatile and robust solution for chronic peripheral nerve research in large animals.
• The battery-less, wireless design and flexible electrode configuration offer significant advantages for freely moving animal studies.