A Flexible Microneedle Electrode Array With Solid Silicon Needles

We propose a novel fabrication process to make flexible microneedle electrode array. The process includes creation of a silicon microneedle electrode array using a silicon-on-insulator substrate followed by its release using parylene films as the support material. The proposed structure provides flexibility of a parylene thin film and rigidity of a silicon structure. Using tissue-penetration tests and impedance spectroscopy, we demonstrate that such a structure is promising in invasive neural electrical stimulation and recording.