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Types of Reversible Electrodes01:24

Types of Reversible Electrodes

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For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
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Polyimide-Based Flexible Microelectrode Array for Non-Invasive Transcorneal Electrical Stimulation.

Víctor Manuel Carpio-Verdín1, Natiely Hernández-Sebastián1, Bernardino Barrientos-García1

  • 1Centro de Investigaciones en Óptica, A.C. Loma del Bosque 115, León 37150, Mexico.

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Summary
This summary is machine-generated.

Researchers developed a novel microelectrode array for transcorneal electrical stimulation (TES) to treat retinal degenerative diseases. This new electrode offers improved spatial selectivity, overcoming limitations of current devices for targeted retinal therapies.

Keywords:
MEMSflexible electronic devicemicroelectrode arraysurface micromachiningtranscorneal electrical stimulation

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Materials Science

Background:

  • Transcorneal electrical stimulation (TES) shows potential for treating retinal degenerative diseases (RDDs).
  • Current TES electrodes, like DTL and ERG-JET, have limitations in spatial resolution and selective stimulation due to their continuous metallic surface.
  • There is a need for advanced TES electrodes that allow for precise, spatially selective electrical stimulation of the retina.

Purpose of the Study:

  • To develop and validate a novel transcorneal electrical stimulation (TES) electrode with enhanced spatial selectivity.
  • To enable targeted activation of specific retinal regions for potential therapeutic applications in RDDs.
  • To assess the fabrication, electrical, electrochemical, and optical properties of the new microelectrode array.

Main Methods:

  • Fabrication of a 20-independent microelectrode array using surface micromachining and flexible electronics with aluminum, titanium, and polyimide.
  • Electrical and electrochemical testing to evaluate conductivity, impedance, and charge storage capacity.
  • In vitro testing for electrical signal transmission and optical transmittance measurements across the visible spectrum.

Main Results:

  • The fabricated electrode demonstrated high electrical conductivity of Al/Ti structures.
  • Low electrochemical impedance (791 kΩ to 1.75 MΩ at 11-30 Hz) and high charge storage capacity (1437 mC/cm²) were achieved.
  • Successful in vitro demonstration of electrical signal transmission and evaluation of optical transmittance for electroretinogram (ERG) recording.

Conclusions:

  • The developed microelectrode array offers spatially selective TES, a significant advancement over conventional electrodes.
  • The simplified, low-cost fabrication process using Al, Ti, and PI makes the electrode reproducible and viable.
  • This novel electrode holds promise for improved therapeutic interventions in RDDs and advanced electroretinogram recording.