Iasonas F. Triantis

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The electrical behavior of the Xenopus laevis nerve fibers was studied when combined electrical (cuff electrodes) and optical (infrared laser, low power sub-5 mW) stimulations are applied. Assuming that the main effect of the laser irradiation on the nerve tissue is the localized temperature increase, this paper analyzes and gives new insights into the(More)
—This paper describes the design of an adaptive control system for recording neural signals from tripolar cuff electrodes. The control system is based on an adaptive version of the true-tripole amplifier configuration and was developed to compensate for possible errors in the cuff electrode balance by continuously adjusting the gains of the two differential(More)
—Electroneurogram (ENG) recording from tripolar cuff electrodes is affected by interference signals, mostly generated by muscles nearby. Interference reduction may be achieved by suitably designed amplifiers such as the true-tripole and quasi-tripole systems. However, in practice their performance is severely degraded by cuff imbalance, resulting in very(More)
This paper describes the realisation of an automatic control system for use in nerve cuff recordings. The system compensates for any impedance mismatches in the cuff by adaptively adjusting the gains of the input differential amplifiers connected to the cuff electrodes. As a result, interference pickup during nerve recordings is greatly reduced. The gains(More)
Electroneurogram (ENG) recording techniques benefit from the use of tripolar cuffs because they assist in reducing interference from sources outside the cuff. However, in practice the performance of ENG amplifier configurations, such as the quasi-tripole and the true-tripole, has been widely reported to be degraded due to the departure of the tripolar cuff(More)
Functional electrical stimulation with cuff electrodes involves the controlled injection of current into an electrically excitable tissue for sensory or motor rehabilitation. Some charge injected during stimulation is 'lost' at the electrode-electrolyte interface when the charge carrier is translated from an electron to an ion in the solution. The process(More)
Bioelectrical impedance measurements can be used in a wide range of clinical applications for monitoring and tissue characterization. Bioimpedance measurement applications need current drivers with high output impedance and stable current injection in the frequencies from DC to about 10 MHz. This paper presents an improved current driver based on a pair of(More)
— This work presents an eight channel neural stimulator interface based on an address event communication protocol. The system developed decodes, integrates and interleaves the spike patterns using a continuous interleave sampling (CIS) strategy, which drives a complex biphasic current waveform to a bipolar electrode configuration. This paper describes the(More)
Functional Electrical Stimulation (FES) may be improved by the use of naturally occurring nerve signals as feedback signals. However, the usefulness of the recorded electroneurogram (ENG) signals from nerve cuff electrodes depends on the amount of electromyogram (EMG) interference and stimulus artefact present. Tripolar cuff electrodes reduce interference(More)