Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 63 for “"Electrode array"”.
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Electronics for a telemetric brain electrode array system
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Telemetric brain electrode array : wireless and analog systems
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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A surface electrode array-based system for functional electrical stimulation
The goal of this thesis is to develop an electrode array-based functional electrical stimulation (FES) system for foot drop correction. The thesis reports a series of studies on the design and development of an electrode array, describes how these results informed the design of a practical array …
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A reconfigurable electrode array for use in rotational electrical impedance myography
… thesis describes the design of a novel handheld electrode probe and measurement system for use in rotational electrical impedance myography (EIM), which is a method for diagnosing neuromuscular disease. The probe can be controlled from a PC via USB and uses an array of small electrode cells that …
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Optimizing Multi-Well Micro-Electrode Array (MW-MEA) Design to Study the Electrophysiology of Neurons
Microelectrode arrays (MEAs) have been widely utilized to measure and study neuronal activities, both in vitro and in vivo. The main focus of this study was to optimize the MEA design to improve the recording efficiency from a group of cells in an area to have a better understanding of what is …
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Two-Dimensional Electrode Array Studies of Propagating Epileptiform Neural Activity in the Rat Hippocampal Slice
A technique has been developed in which a planar array of 32 microelectrodes, arranged in a 4 by 8 pattern with 200 $\mu$m separation, is used to record from and to stimulate the rat hippocampal slice preparation at multiple sites. Active suppression circuitry is used to prevent device saturation …
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Development and modelling of a versatile active micro-electrode array for high density in-vivo and in-vitro neural signal investigation
… small scale networks to be observed using arrays of micro-fabricated electrodes. These arrays transduce ionic perturbations local to the cell membrane in the extracellular fluid into small electrical signals within the metal that may be measured. A device was designed for optimal electrical …
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Characterization of spontaneous and evoked activity of mouse embryonic stem cell derived motor neurons using optogenetics and micro electrode array electrophysiology
… MN networks. The following work uses multi-electrode array (MEA) electrophysiology and optogenetics to characterize electrical activity of MNs differentiated from mouse embryonic stem (mES) cells. A customizable substrate integrated 60-electrode MEA chip was designed for this study. MEA …
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Advanced dielectrophoretic cell separation systems
… process sample volumes in the 100mL range. The electrode configuration developed for this work allows the isolation and concentration of single particle types from large sample volumes; a method which could be further developed into a new rare-cell separation technology. In addition, a new …
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Multiple Electrode Recording of Cardiac Activation.
… galvanometer. This report describes a multiple electrode device which has been used to record the electrical activation of the epicardial surface of the heart during open heart surgery. It consists of flexible circuit materials and represents and improved version of a multiple electrode array …
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Encapsulation of electronic components for a retinal prosthesis
… of the encapsulation material. The first is an electrode array on a polyimide strip. The second is a platinum return wire. Difficulty in finding encapsulation materials has arisen from saline leakage at the interface of the encapsulant and these two protruding components. This thesis addresses …
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Design, construction, and testing of ultrasonic transducers with modified radial velocity profiles
… a circularly symmetric metallic multiple electrode array on a 12. 7 mm diameter x-cut quartz disk. Each electrode is independently connected to an impedance network optimized to produce the Gaussian distribution with less than two percent maximum error. A computer aided electrode design …
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Experiments To Improve Behavior of Electrowetting Surfaces in Microhydraulic Actuators
… actuators consist of two parts, rotor (droplet array) and stator (electrode array), that move relative to each other. This thesis focuses on the latest two versions of actuators, MHA5 and MHA6, which differ in geometry and fabrication process. MHA5 demonstrated successful electrical actuation …
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The benefits of acoustic input to combined electric and contralateral acoustic hearing
… listeners fitted with a traditional-long electrode array or a partial-insertion electrode array have residual acoustic hearing either in the nonimplanted ear or in both ears and have shown to receive significant speech-perception benefits from the low-frequency acoustic information …
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Deciphering the neural code for retinal ganglion cells through statistical inference
… retina, obtain in-vitro recordings from a multi-electrode array, and attempt to identify or reconstruct the scene. Our approach uses the well-known linear-nonlinear Poisson model to characterize neural firing behavior and accounts for stochastic variability by fitting parameters using maximum …
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Task-Dependent Oscillatory Brain Activity During Oculomotor Delayed Response Task
… adults (18-34 years) were recorded using dense electrode array. The data was analyzed by 6-cycle Morlet wavelet decompositions in the frequency range of 2-30 Hz to create time- frequency decompositions for four midline electrode sites. The 99% confidence intervals using the bootstrapped 20% …
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Development of a Modular Electromyography System
… One design focuses on the use of bipolar electrodes to monitor a single muscle group. Several of these electrodes can then be used to monitor different muscles on the body simultaneously. Another design places many electrodes in an array on a limb or over a single muscle. One cannot be …
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Investigation of synthetic methods for preparation of 2<sup>o</sup>-amino derivatives of 5-amino- 1, 10-phenanthroline: Applications to Cu<sup>+2</sup> based impedance sensors
… self-assembled monolayers on gold interdigitated electrode array chips in standard impedance and impedance resonance-based Cu<sup>2+</sup> sensors. Potential applications include monitoring Cu<sup>2+</sup> leaching from anti-fouling coatings on ship hulls. The importance of the planned secondary …
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Brain microelectrode array systems
New methods for manufacturing microelectrode array assemblies, passive devices designed for intracortically recording brain activity in nonhuman primates, were developed and explored. Wire electrical discharge machining (EDM), chemical etching, micromilling, parylene deposition, and laser ablation …
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