Wireless, miniaturized, semi-implantable electrocorticography microsystem validated in vivo

Area of Science:

• Biomedical Engineering
• Neuroscience
• Implantable Medical Devices

Background:

• Electrocorticography (ECoG) is crucial for brain research and clinical applications.
• Existing ECoG systems often face limitations in wireless capability and miniaturization.
• There is a need for advanced, compact wireless systems for high-density neural recordings.

Purpose of the Study:

• To design, develop, and test a novel multi-channel wireless micro-electrocorticography (µECoG) system.
• To create an ultra-compact, semi-implantable recording unit for in vivo neural activity monitoring.
• To validate the system's performance in capturing spontaneous and evoked brain activities.

Main Methods:

• Developed a system with a semi-implantable recording unit and an external unit connected via a 2.4 GHz RF telemetry link.
• Utilized a 3D-printed package for the recording unit, integrating off-the-shelf components and lithium-ion batteries.
• Designed and tested both rigid and flexible microelectrode arrays (4x2 and 12x6) for neural signal acquisition.
• Validated the system's functionality through in vivo testing on anesthetized rats.

Main Results:

• Successfully designed and assembled a compact, multi-channel wireless µECoG system.
• Demonstrated a data transfer rate of 2 Mbps using the RF telemetry link.
• The system effectively recorded both spontaneous and evoked brain activities in animal models.
• Validated the performance of both rigid and flexible microelectrode array configurations.

Conclusions:

• The developed wireless µECoG system offers a promising solution for advanced neural recording.
• The system's compact design and wireless capabilities facilitate less invasive brain activity monitoring.
• This technology has potential applications in neuroscience research and the development of brain-computer interfaces.