학술논문
Fabrication and test of implantable thin-film electrodes for stimulation and recording of biological signals
Document Type
Conference
Author
Source
1st Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology. Proceedings (Cat. No.00EX451) Microtechnologies in medicine and biology Microtechnologies in Medicine and Biology, 1st Annual International, Conference On. 2000. :619-623 2000
Subject
Language
Abstract
The fabrication, characterization and application of polyimide-based flexible microelectrodes for recording from and stimulation of biological tissue are described. The planar electrodes consist of a polyimide-platinum-polyimide sandwich structure with a total thickness of 10 to 40 /spl mu/m fabricated on Pyrex or silicon wafers. Several designs with mono-polar or multi-polar probe-type electrodes have been realized. Two different fabrication technologies using photosensitive (PS-PI) and non-photosensitive polyimide (NPS-PI) have been developed. For the photostructurable polyimide a three-mash process was realized, whereas for the non-photosensitive polyimide a simpler two-mask process using dry etching techniques was used. A sacrificial layer of aluminum served for detachment of the structures by anodic metal dissolution. This is a particularly biocompatible release procedure as the microelectrodes are detached from the fabrication substrate in a sodium salt solution. Obtained microelectrodes were characterized by impedance spectroscopy and were used to record multi-channel EMG signals from free-walking insects.