Design and Optimization Methodology of Sub-dermalElectroencephalography Dry Spike-Array Electrode

Electrical & Computer Engineering;bio-electrodes;EEG;mems;microfabrication

Gabran, Salam Ramy

University of Waterloo

关键词: Electrical & Computer Engineering;    bio-electrodes;    EEG;    mems;    microfabrication;   

Others  :  https://uwspace.uwaterloo.ca/bitstream/10012/2793/1/sgabran2006.pdf

瑞士|英语

来源: UWSPACE Waterloo Institutional Repository

【 摘 要 】

Monitoring bio-electric events is a common procedure, which provides medical data required in clinical andresearch applications. Electrophysiological measurements are applied in diagnosis as well as evaluation of theperformance of different body organs and systems, e.g. the heart, muscles and the nervous system. Furthermore,it is staple feature in operation rooms and extensive care units. The performance of the recording system isaffected by the tools and instrumentation used and the bio-electrode is a key-player in electrophysiology, hence,the improvements in the electrode recording technique will be directly reflected in the system?s performance interms of the signal quality, recording duration as well as patient comfort. In this thesis, a design methodology for micro-spike array dry bio-electrodes is introduced.

The purpose of this methodology is to meet the design specifications for portable long-term EEG recording andoptimize the electrical performance of the electrodes by maximizing the electrode-skin contact surface area,while fulfilling design constraints including mechanical, physiological and economical limitations. This wasfollowed by proposing a low cost fabrication technique to implement the electrodes. The proposed electrodedesign has a potential impact in enhancing the performance of the current recording systems, and also suitsportable monitoring and long term recording devices. The design process was aided by using a software designand optimization tool, which was specifically created for this application.

The application conditions added challenges to the electrode design in order to meet the requiredperformance requirements. On the other hand, the required design specifications are not fulfilled in the currentelectrode technologies which are designed and customized only for short term clinical recordings.

The electrode theory of application was verified using an experimental setup for an electrochemicalcell, but the overall performance including measuring the electrode impedance is awaiting a clinical trial.