Abstract
This paper presents the design and implementation of an integrated wireless microsystem platform that provides the possibility to support versatile implantable neural sensing devices in free laboratory rats. Inductive coupled coils with low dropout regulator design allows true long-term recording without limitation of battery capacity. A 16-channel analog front end chip located on the headstage is designed for high channel account neural signal conditioning with low current consumption and noise. Two types of implantable electrodes including grid electrode and 3D probe array are also presented for brain surface recording and 3D biopotential acquisition in the implanted target volume of tissue. The overall system consumes less than 20 mA with small form factor, 3.9 × 3.9 cm2 mainboard and 1.8 × 3.4 cm2 headstage, is packaged into a backpack for rats. Practical in vivo recordings including auditory response, brain resection tissue and PZT-induced seizures recording demonstrate the correct function of the proposed microsystem. Presented achievements addressed the aforementioned properties by combining MEMS neural sensors, low-power circuit designs and commercial chips into system-level integration.
Highlights
Neuroscience engineering together with biomedical devices for neural recording in the central nervous system are widely viewed as a promising path to revolutionary progress in understanding neural functions and for the realization of practical neural prostheses
Microsystem platforms with analog front ends, micro controller units and wireless data/power transferring ability offer the possibility to connect with all kind of neural sensing elements for different applications
The microsystem addressed the aforementioned properties by combining MEMS neural sensors, low-power circuit designs and commercial chips into system-level integration
Summary
Electrode/3-Dimensional Probe Array for ECoG and Extracellular Neural Recording in Rats. Received: 21 January 2013; in revised form: 21 March 2013 / Accepted: 28 March 2013 /
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