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Updated: Jun 14, 2025

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Multi-Channel Microscale Nerve Cuffs for Spatially Selective Neuromodulation.

Morgan Riley1, Fnu Tala2, Katherine J Johnson3

  • 1Biomedical Engineering Doctoral Program, Boise State University, Boise, ID 83725, USA.

Micromachines
|August 29, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a new, cost-effective method for creating high-resolution nerve cuffs. This breakthrough enables selective nerve stimulation, advancing neuromodulation therapies for various conditions.

Keywords:
cuffcustommicro-scalemulti-channelneuromodulationselective

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Medical Devices

Background:

  • Electrical stimulation for peripheral nerve modulation offers therapeutic potential but suffers from poor selectivity and side effects.
  • Existing commercial nerve cuffs are expensive and lack spatial resolution, while custom-designed cuffs require specialized fabrication.
  • The difficulty in prototyping nerve cuffs hinders research into selective neuromodulation.

Purpose of the Study:

  • To develop a reproducible, cost-effective method for fabricating multi-channel epineural nerve cuffs for selective fascicular neuromodulation.
  • To create customizable nerve cuffs with high spatial resolution for acute neuromodulation studies.

Main Methods:

  • Utilized commercial flexible printed circuit (FPC) technology to fabricate nerve cuffs with adjustable electrode size, channel count, and diameter.
  • Designed cuffs for adult mouse and rat sciatic nerves (300-1500 μm diameter).
  • Coated electrodes with PEDOT:PSS to enhance charge injection capacity and validated selectivity using micro-computed tomography (μCT).

Main Results:

  • Successfully fabricated high-resolution (50 μm) nerve cuffs using FPC technology.
  • Demonstrated selective neuromodulation in rats and mice, achieving preferential activation of tibialis anterior (TA) and lateral gastrocnemius (LG) muscles.
  • Quantified selectivity using a selectivity index, confirming the method's efficacy.

Conclusions:

  • The developed fabrication method enables rapid and cost-effective prototyping of multi-channel epineural nerve cuffs.
  • This approach facilitates research into selective fascicular neuromodulation by overcoming limitations of existing technologies.
  • The method holds significant potential for advancing the study and application of targeted nerve stimulation therapies.