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, 2011, 2973-6

A Novel Flex-Rigid and Soft-Release ECoG Array


A Novel Flex-Rigid and Soft-Release ECoG Array

E Tolstosheeva et al. Conf Proc IEEE Eng Med Biol Soc.


This article addresses a novel fabrication process for an electrocorticogram (ECoG) electrode array. It consists of three regions: a flexible recording area, a flexible cable, and a rigid field for soldering the connectors. The flexible components can adapt to the curved shape of the cerebral cortex. Furthermore, the entire structure is a free-standing membrane, attached by removable polyimide straps to its carrier substrate. This configuration allows for a high level of control during soldering, electrode characterization and sterilization, as well as a soft release of the array off its carrier just before implantation. The array contains 128 gold electrodes, each 300 nm thick, sandwiched between two 5 μm thick polyimide films. The measuring area of the device is a regular hexagon with a side length of 7.2 mm, designed for implantation on the primary visual cortex of a Rhesus monkey. The flexible cable is 4 cm long. The rigid soldering area was designed for 4 × 32 OMNETICS connectors. The line resistance from an electrode site to the corresponding electrical connector pin is 540 Ω.

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