TAMPERE UNIVERSITY OF TECHNOLOGY Master’s Degree Programme in Electrical Engineering ILKKA HOKAJÄRVI: Electrode Contact Impedance and Biopotential Signal Quality Master of Science Thesis, 66 pages, 3 Appendix pages September 2012 Major: Biomedical Engineering Examiner: Professor Jari Hyttinen

We review recently obtained results for CMOS (Complementary Metal Oxide Semiconductor) imaging devices used in biomedical applications. The topics include dish type image sensors, deep-brain implantation devices for small animals, and retinal prosthesis devices. Fundamental device structures and their characteristics are described, and the results of in vivo experiments are presented. key words...

Model Based Investigation of Virtual Electrodes of the Multi-Electrode Array for Epiretinal Prostheses by Jerel Mueller Department of Biomedical Engineering Duke University Date:_______________________ Approved: ___________________________ Warren Grill, Supervisor ___________________________ Craig Henriquez ___________________________ Patrick Wolf An abstract of a thesis submitted in partial fu...

Introduction In the original evaluation of the Nova 2 analyser [1] inter-electrode differences were shown which would have necessitated the re-establishment of the ionised calcium reference range each time that the calcium ion-selective electrode was changed. The manufacturers (Nova Biomedical, Newtown, Mass, USA) have now replaced the electrodes which showed slow and variable response times to...

Atmospheric pressure single electrode argon /oxygen plasma jet has been generated between a high-voltage electrode and the surrounding room air for treating thermally sensitive materials is reported. The discharge has been characterized by electrical and optical emission spectroscopic technique. The microplasma jet device operated by an electrical power less than 10 W exhibited a long plasma je...

Many kinds of surface electrodes are used today in EMG, the small silver and gold cup being the standard electrode in the United States. A suction-cup surface electrode is rarely used but several years of experience with many kinds of electrodes in our laboratory have led us to the conclusion that this electrode has many practical qualities. The suction-cup electrode has several advantages over...

ATP, the molecule used by living organisms to supply energy to many different metabolic processes, is synthesized mostly by the ATPase synthase using a proton or sodium gradient generated across a lipid membrane. We present evidence that a modified electrode surface integrating a NiFeSe hydrogenase and a F1 F0 -ATPase in a lipid membrane can couple the electrochemical oxidation of H2 to the syn...

With the rapid development of Micro-electro-mechanical Systems (MEMS) fabrication technologies, many microelectrodes with various structures and functions have been designed and fabricated for applications in biomedical research, diagnosis and treatment through electrical stimulation and electrophysiological signal recording. The flexible MEMS microelectrodes exhibit excellent characteristics i...

Abstract-Now medical treatments are supported by computerized process. Biomedical signal recorded from the human body give many valuable information about the human body organ’s biological activities. These signals are time varying and non-stationary in nature. But many time these biomedical signals are contaminated with drift and interferences caused by bioelectric phenomena, or by power line ...

Electrical impedance tomography (EIT) produces an image of the electrical impedance distribution of tissues in the body, using electrodes that are placed on the periphery of the imaged area. These electrodes inject currents and measure voltages and from these data, the impedance can be computed. Traditional EIT systems usually inject current patterns in a serial manner which means that the impe...