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Activated Iridium Oxide Film (AIROF) microelectrodes are being proposed for use in multiple neural prosthesis designs because they are characterized by a high charge-delivery capacity. Implicit in their use, is the restriction of limiting the electrode polarization within limits that do not initiate water electrolysis at the electrode/electrolyte interface. These limits, the so-called ";water...
Activated iridium oxide film (AIROF) microelectrodes have high charge delivery capacity within polarization limits that don't initiate water electrolysis at the electrode/electrolyte interface. These limits, the so-called "water window," are used to ensure that the AIROF electrodes can deliver charge reversibly in various electrolyte environments. However, strictly observing these limits...
We present the design of an automatic electrode monitoring system for activated iridium oxide (AIROF) microelectrodes. It's a valuable piece of instrument in use in our laboratory to monitor the "health" of chronic implanted microelectrodes before neural stimulation or recording experiments. It is capable of automatically measuring electrode voltage and current of a large number of electrodes...
Cyclic voltammetry (CV) at slow scan rate is usually performed to characterize the electrochemical behavior of microelectrodes. Early in vitro study on over 200 activated iridium oxide film (AIROF) microelectrodes showed variability of their electrochemical behavior. In this paper, we reported CV measurements under 3 different scan rates for 96 AIROF microelectrodes. We traced their behavior during...
We present the design and testing of a 96-channel stimulation system to drive activated iridium oxide (AIROF) microelectrodes within safe charge-injection limits. Our system improves upon the traditional capacitively coupled, symmetric charge-balanced biphasic stimulation waveform so as to maximize charge-injection capacity without endangering the microelectrodes. It can deliver computer-controlled...
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