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Related Experiment Video

Updated: May 10, 2026

Combined Shuttle-Box Training with Electrophysiological Cortex Recording and Stimulation as a Tool to Study Perception and Learning
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Published on: October 22, 2015

A flexible base electrode array for intraspinal microstimulation.

Imad Khaled, Salma Elmallah, Cheng Cheng

    IEEE Transactions on Bio-Medical Engineering
    |June 8, 2013
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a flexible base array for spinal cord interfacing. This new design reduces stress on the spinal cord compared to rigid arrays, offering improved biocompatibility for neural implants.

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    Chronic Implantation of Multiple Flexible Polymer Electrode Arrays
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    Chronic Implantation of Multiple Flexible Polymer Electrode Arrays

    Published on: October 4, 2019

    Area of Science:

    • Biomedical Engineering
    • Neuroscience
    • Materials Science

    Background:

    • Spinal cord interfacing requires electrode arrays that minimize mechanical stress and strain on neural tissue.
    • Existing electrode designs, particularly those with rigid bases, can induce significant stress, potentially leading to tissue damage and reduced device longevity.
    • Developing flexible and adaptable electrode interfaces is crucial for advanced neuroprosthetics and research.

    Purpose of the Study:

    • To develop and characterize a novel flexible base array of penetrating electrodes for spinal cord interfacing.
    • To quantitatively assess the mechanical impact (strain and stress) of this flexible array on surrogate spinal cords compared to rigid base arrays and individual microwires.
    • To validate a finite element model for predicting the mechanical behavior of electrode arrays on neural tissue.

    Main Methods:

    • Fabrication of flexible base electrode arrays using a customizable protocol.
    • Implantation of electrode arrays into surrogate spinal cords subjected to 12% elongation.
    • Optical measurement of cord strains and comparison between flexible base, rigid base, and no-base (microwire) arrays.
    • Validation of a 2-D finite element model using experimental strain data.
    • Computational assessment of stresses induced by different array designs and design parameters.

    Main Results:

    • Flexible base arrays exhibited deformation behavior similar to individual microwires, unlike rigid base arrays.
    • Experimental strain measurements validated the finite element model.
    • Rigid base arrays induced significantly higher stresses on the surrogate cord compared to flexible base arrays.
    • Flexible base arrays imposed higher stresses than individual microwires without a base.
    • The developed flexible base array demonstrated mechanical advantages over rigid designs but requires further stiffness reduction.

    Conclusions:

    • The flexible base electrode array offers improved mechanical compatibility for spinal cord interfacing compared to rigid designs.
    • Further optimization of the flexible base array's mechanical properties is needed to fully mimic the behavior of non-based microwire implants.
    • The validated finite element model provides a valuable tool for designing and optimizing future neural electrode interfaces.