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Fabrication and inductive power transfer in wireless spherical pill microprobes

We report the fabrication and wireless power coupling for a neural probe, not based on the needle geometry but a much less intrusive minimum-radius spherical pill. The pills 1.3 mm in diameter, consist of two parylene hemispherical halves which can be bonded together to enclose a bio-telemetry circuit. The two hemispheres contain feedthrough electrodes and micro coils patterned along the shell surface respectively. A 1.2 mm diameter hemispherical coil can receive 24.5 mW with a peak-peak AC voltage output of 5.8 V, sufficient to power bio-telemetry circuits, from an external 10 W RF power source placed 1 cm away.