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Tight Junctions01:29

Tight Junctions

Tight junctions are molecular seals between cells that prevent the leaking of fluids, ions, and other small solutes across cavities and compartments in multicellular organisms. They are mainly composed of claudin and occludin transmembrane proteins, and other proteins such as tricellulin and JAM (junctional adhesion molecule). All these proteins are 4-pass transmembrane proteins, except JAM, which is a single-pass transmembrane protein belonging to the immunoglobulin superfamily. The...

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Using a single penetrating interfascicular electrode to improve spatial selectivity of an extraneural polymeric cuff

Imane Ben M'Rad1,2, Zachary K Bailey1, Estelle A Cuttaz1

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A new peripheral nerve interface (SPIFEC) using polymeric electrodes offers improved selectivity for nerve repair. This device enhances spatial selectivity, outperforming traditional designs and showing promise for neuroprosthetic applications.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Materials Science

Background:

  • Peripheral nerve damage causes significant motor and sensory deficits, necessitating advanced neural interfaces.
  • Current peripheral nerve interfaces (PNIs) face limitations in selectivity, electrode material properties, and invasiveness trade-offs.
  • Existing strategies like current steering have not met clinical demands for precise nerve stimulation.

Purpose of the Study:

  • To develop and evaluate a novel peripheral nerve interface (SPIFEC) for enhanced fascicular selectivity.
  • To overcome limitations of traditional metal-based electrodes and invasive PNI designs.
  • To improve spatial selectivity for potential neuroprosthetic applications.

Main Methods:

  • Developed a novel SPIFEC array using laser-based fabrication with polymeric materials, combining extraneural cuff and single penetrating interfascicular electrodes.
  • Characterized electrochemical properties of polymeric electrodes.
  • Conducted ex vivo experiments on rat sciatic nerves to assess fascicular selectivity and used CT imaging to confirm electrode placement.

Main Results:

  • The SPIFEC array features seven extraneural and one interfascicular penetrating electrode.
  • Polymeric electrodes exhibited low impedance, high charge storage capacity, and high charge-injection limits compared to metallic devices.
  • Ex vivo studies demonstrated high fascicular selectivity, surpassing non-penetrating cuffs, with CT confirming accurate electrode positioning.

Conclusions:

  • The novel SPIFEC array shows significant potential for improving spatial selectivity in peripheral nerve applications.
  • The device's performance suggests promise for future neuroprosthetic systems.
  • Further in vivo studies are necessary to confirm long-term efficacy and clinical viability.