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Microelectrode Array With Integrated Pneumatic Channels for Dynamic Control of Electrode Position in Retinal

Yuanhao Xu, Stella Pang

    IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
    |October 27, 2021
    PubMed
    Summary

    This study introduces a novel microelectrode array (MEA) for retinal prostheses that dynamically adjusts electrode positions to improve contact with the retina. This innovation enhances artificial vision for patients with retinal diseases by ensuring consistent electrode function.

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    Area of Science:

    • Biomedical Engineering
    • Neuroscience
    • Ophthalmology

    Background:

    • Retinal prostheses aim to restore vision using electrical stimulation.
    • Poor topographical fit of microelectrode arrays (MEAs) on the retina causes gaps, leading to impaired electrode function.
    • Existing MEA designs struggle with the retina's complex surface, limiting device efficacy.

    Purpose of the Study:

    • To propose and evaluate a novel MEA design with dynamically controlled electrode positions.
    • To reduce the electrode-retina distance and eliminate poor contact areas post-implantation.
    • To develop a method for real-time monitoring of electrode-retina contact.

    Main Methods:

    • Developed a flexible hybrid substrate MEA with specialized electrodes and counter electrodes.
    • Integrated ring-shaped counter electrodes around main electrodes for real-time distance measurement.
    • Utilized impedance changes between main and counter electrodes to assess electrode-retina gap.

    Main Results:

    • The proposed MEA design reduced electrode-retina distance by up to [Formula: see text] under 200 kPa pressure.
    • Increased impedance between electrodes correlated with decreased electrode-retina distance.
    • The impedance change effectively indicated electrode-retina contact without optical coherence tomography scans.
    • Applied pressure significantly improved stimulation signal amplitude in areas with initially poor contact.

    Conclusions:

    • Dynamically controlled electrode positioning in MEAs can overcome topographical challenges on the retinal surface.
    • Electrode-impedance monitoring offers a viable method for confirming functional contact in retinal prostheses.
    • This technology holds promise for improving the performance and reliability of artificial vision devices.