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Related Concept Videos

Propagation of Action Potentials01:23

Propagation of Action Potentials

The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...

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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
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Published on: May 12, 2019

Offset prediction for charge-balanced stimulus waveforms.

V M Woods1, I F Triantis, C Toumazou

  • 1Center for Bio-Inspired Technology, Bessemer Building, Imperial College London, South Kensington Campus, London SW7 2AZ, UK. vwoods@imperial.ac.uk

Journal of Neural Engineering
|July 15, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a novel waveform design for functional electrical stimulation (FES) to improve electrode longevity and biocompatibility. By using unequally charged biphasic waveforms, researchers significantly reduced charge loss during continuous pulsing.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Materials Science

Background:

  • Functional electrical stimulation (FES) uses cuff electrodes for tissue stimulation, crucial for rehabilitation.
  • Charge injection during FES can lead to electrode degradation and reduced biocompatibility due to electrochemical reactions at the electrode-electrolyte interface.
  • Current methods to minimize excess charge often rely on complex hardware, unsuitable for long-term implants.

Purpose of the Study:

  • To present a waveform design strategy that minimizes irrecoverable charge during continuous FES pulsing.
  • To enhance electrode longevity and implant biocompatibility by addressing charge injection inefficiencies.
  • To offer a software-based solution for charge management in FES.

Main Methods:

  • Developed an equivalent electrical model of the electrode-electrolyte interface under pseudo-bipolar stimulation.
  • Utilized simulations based on the electrical model to determine relationships between stimulus parameters and uncompensated charge.
  • Designed and tested novel biphasic waveforms with unequally charged phases to preemptively compensate for excess charge.

Main Results:

  • The equivalent circuit model successfully predicted uncompensated charge as a function of stimulus parameters.
  • In vitro experiments confirmed the effectiveness of the designed waveforms in compensating for excess charge.
  • A 92% reduction in pre-pulse potential was observed with the new waveform design compared to conventional biphasic waveforms after a pulse train.

Conclusions:

  • The proposed waveform design effectively minimizes irrecoverable charge during continuous FES.
  • This approach offers a promising, hardware-independent method to improve the longevity and biocompatibility of FES implants.
  • Unequally charged biphasic waveforms represent a significant advancement in optimizing charge injection for FES applications.