Neuromuscular electrical stimulation using different waveforms: Properties comparison by applying single pulses

Meza-Cuevas, Mario A.; Schroeder, Dietmar; Krautschneider, Wolfgang H.

doi:10.1109/bmei.2012.6512988

Cited by 5 publications

(5 citation statements)

References 28 publications

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“…Here, we take both surface charge distribution and the dynamic charge transfer process into consideration. By utilizing the electron cloud potential well , and an EDL model to illustrate electron and ion transfer, we propose a temperature-dependent CE mechanism.…”

Section: Resultsmentioning

confidence: 99%

“…When the PET is dipped into a solution, the negatively charged PET promotes the formation of an EDL on its surface. , According to the improved Gouy–Chapman–Stern EDL model, there exist three layers at the liquid–solid interface, namely the immobile Stern layer, consisting of the inner Helmholtz plane (IHP) and the outer Helmholtz plane (OHP), diffuse layer and the bulk solution. , IHP consists of water molecules and specifically adsorbed ions in solution by a chemical bond formed by redox reactions . As discussed above, electron transfer could take place between the water molecules and PET in IHP .…”

Section: Resultsmentioning

confidence: 99%

“…From the discussion above, we conclude that the size of anions does not seem to affect T t significantly. This implies that the screening effect of anions is relatively insignificant, probably because anions are subjected to repulsive force from the negatively charged PET film so that they only remain in the diffuse layer and the bulk solution . Moreover, the solutions with higher concentrations could have a lower T t due to the larger availability of cations to be attracted to OHP .…”

Section: Resultsmentioning

confidence: 99%

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Revisiting Contact Electrification at Polymer–Liquid Interfaces

Tan

Zhang

2022

Langmuir

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Contact electrification (CE) occurs naturally at all interfaces between solids and solids, solids and liquids, solids and gasses, and so forth. It has been extensively studied for decades. While CE at a solid−solid interface has been demonstrated to be primarily caused by electron transfer, the underlying mechanism of CE at a liquid−solid interface remains controversial. In this paper, the CE process between polyethylene terephthalate (PET) and different inorganic solutions at different temperatures is studied to investigate the charge transfer mechanism. The observed temperature−CE charge relationship falls into two categories, that is, the general case and the special case. In the general case, the CE charge first increases negatively and then positively with the temperature. The CE charge increasing negatively could result from enhanced electron transfer at the interface, while the CE charge increasing positively may be caused by increasing adsorption of cations, which neutralize the negative charges on the PET surface. In contrast, the CE charge first increases positively and then negatively with the temperature in the special case. The CE charge increasing positively could be attributed to more cations being attracted to the negatively charged PET surface, while the charge increasing negatively may be caused by more anions being attracted to the PET due to enhanced cation adsorption. Supported by the surface charge and dynamic charge transfer at different PET−solution interfaces and solution temperatures, our study provides a plausible interpretation of the temperature-dependent CE at the polymer−liquid interfaces.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Revisiting Contact Electrification at Polymer–Liquid Interfaces

Tan

Zhang

2022

Langmuir

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“…On the other hand this dramatically increases the simulation time, as all combinations of amplitudes have to be computed and compared. (Meza-Cuevas et al, 2012) experimentally showed that a pulse shape with decreasing amplitude like sinusoidal is suited best to trigger an action potential.…”

Section: Active Model Simulation Resultsmentioning

confidence: 99%

Usability of Passive Models for Energy Minimization of Transcutaneous Electrical Stimulation - Possibilities and Shortcomings of Analytical Solutions of Passive Models and Possible Improvements

Reinert

Loitz

Remer

et al. 2016

Proceedings of the 9th International Joint Conference on Biomedical Engineering Systems and Technologies

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Transcutaneous electrical stimulation is a more and more used rehabilitation technique for patients suffering from spinal cord injury or stroke. The commonly used pulse shape is the biphasic rectangular pulse, which leads to the question whether another, more efficient pulse shape exists that consumes less energy. In this study a passive model for electrical stimulation was develepod and an analytical analysis was performed. The resulting energy optimal pulse shape was then compared to the results of an active model. To improve the accuracy of the passive model, a simple ionic current correction was introduced, which leads to comparable results of an active model. Concluding it can be said that passive models are a good approach to give notions of some effects, but have to be extended to fit reality.

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“…Linear decrease waveform was selected by mainly two main reasons. According to [Meza-Cuevas et al, 2012], linear decrease indicated lower charge injection, dissipated energy and the corresponding voltage at the electrodes than the rectangular waveform required for stimulation. Secondly, the time-consuming in simulation in Comsol showed a maximum time of about 1.5 min.…”

Section: Stimulation Safetymentioning

confidence: 99%

3D Electrode Array for Single-cell selectivity in Visual Prosthesis

Villarreal

Krautschneider

2020

Preprint

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Background : Visual prostheses electrically stimulate nearby neurons to generate artificial vision in patients blinded by retinal degenerative diseases. Current prosthetic devices offer limited spatial resolution that results in unselective stimulation of retinal ganglion cells (RGCs). This can be understood as a falling short of visual prosthesis to generate a complete visual scene with detail perception. In this report, the 3D linear electrode carrier is introduced. Our analysis develops a proof of principle to identify the usefulness of the 3D array to activate selectively single RGCs using small electrode size at the highest-density cell.Methods : A simulation framework was built by locating the 3D linear electrode carrier with the highest-density cell. Stimulation of the 3D carrier is implemented at horizontal meridian in the superior retina within the region of 1 mm away from the fovea centralis. Stimulation in that space is needed for critical functions such as object recognition, reading, and driving. The simulation framework obeyed the RGC density and distribution, ganglionic layer thickness, vertical distribution and cell diameter at the fovea. To verify RGC electrical stimulation, the relevant retinal interface elements and dynamics of the voltage-gated ionic channels were integrated into a 3D computational model in COMSOL Multiphysics.Results : the distribution of stimulus from a single active electrode to ground generates a volume of stimulation equivalent to the volume contained by a single RGC at the highest-density cell. Sensitive retinal tissue is safeguarded from electrochemical reactions caused by excessive charge density, the formation of corrosion and neural tissue heating since the advanced technology of the 3D array injects low thresholds for effective stimulation.Conclusions : The 3D electrode array can provide a safe stimulus to enhance visual resolution that can be delivered by +1000 electrodes. This is required in humans for activities where visual detail is of primary importance and thus relevant for high-resolution vision. The 3D electrode array reveals small proximities of electrodes to cells for activation. This is of an advantage for cells located near and very-deep in the ganglion layer because low thresholds are injected to the electrodes producing a well-defined localization of stimulus, an independent activation that targets single RGCs and a safe stimulus.

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Neuromuscular electrical stimulation using different waveforms: Properties comparison by applying single pulses

Cited by 5 publications

References 28 publications

Revisiting Contact Electrification at Polymer–Liquid Interfaces

Revisiting Contact Electrification at Polymer–Liquid Interfaces

Usability of Passive Models for Energy Minimization of Transcutaneous Electrical Stimulation - Possibilities and Shortcomings of Analytical Solutions of Passive Models and Possible Improvements

3D Electrode Array for Single-cell selectivity in Visual Prosthesis

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