Wireless data and power transfer of an optogenetic implantable visual cortex stimulator

Area of Science:

• Biomedical Engineering
• Neuroscience
• Wireless Communication

Background:

• Optogenetic implants offer promising therapeutic potential for visual cortex disorders.
• Efficient wireless data and power transfer are critical for the functionality and longevity of implantable devices.
• Existing wireless power transfer methods face challenges with tissue penetration and efficiency.

Purpose of the Study:

• To demonstrate wireless data and power transfer for a novel optogenetic visual cortex implant system.
• To evaluate the performance of wireless transfer through biological tissue mimics.
• To ensure the system meets the power requirements for visual cortex stimulation.

Main Methods:

• Utilized pork tissue as an in-vitro mimic for biological environments.
• Employed ISM 2.4 GHz for data transfer and 13.5 MHz for power transfer.
• Designed and simulated a Class E power amplifier for the transmitter.
• Measured data rate, data loss, transferred power, and coupling coefficient.

Main Results:

• Achieved a data rate of 120 kbps with no data loss up to 35 mm tissue thickness.
• Transmitter output power of ~223 mW with 81.83% efficiency.
• Delivered 66.80 mW receiver power through 5 mm pork tissue with ~0.8 coupling.
• Demonstrated sufficient power transfer for visual cortex implant requirements.

Conclusions:

• Wireless data and power transfer is feasible for optogenetic visual cortex implants.
• The demonstrated system achieves high data rates and efficient power delivery through tissue.
• This technology supports the development of functional and reliable neural implants.