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Related Experiment Video

Updated: Mar 15, 2026

Microelectrode Guided Implantation of Electrodes into the Subthalamic Nucleus of Rats for Long-term Deep Brain Stimulation
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Mechanically Stable Intraspinal Microstimulation Implants for Human Translation.

Amirali Toossi1,2, Dirk G Everaert3,2, Austin Azar4,2

  • 1Neuroscience and Mental Health Institute, University of Alberta, 5005 Katz Building, Edmonton, AB, T6G 2E1, Canada.

Annals of Biomedical Engineering
|August 27, 2016
PubMed
Summary
This summary is machine-generated.

Stable intraspinal microstimulation (ISMS) implants are crucial for restoring function after spinal cord injury. This study quantified spinal cord movement and electrode dislodgement forces in pigs, leading to the design of improved, mechanically stable ISMS implants for human use.

Keywords:
Coiled lead wireDislodgment forcesIntraspinal implantLumbar spine biomechanicsStrain relief

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Spinal Cord Injury Research

Background:

  • Intraspinal microstimulation (ISMS) shows promise for restoring function after spinal cord injury by activating neural networks.
  • Translating ISMS from animal models to human applications requires addressing mechanical stability challenges of implanted devices.

Purpose of the Study:

  • To quantify spinal cord movement and electrode dislodgement forces during spinal motion in a porcine model.
  • To develop and assess strain relief mechanisms for enhancing the mechanical stability of ISMS implants for human use.

Main Methods:

  • Domestic pigs were used to measure spinal cord displacement and length changes during flexion-extension movements.
  • Forces causing ISMS electrode dislodgement were measured.
  • Six different coil types were fabricated and tested for strain relief capacity between electrodes and stimulator.

Main Results:

  • Spinal cord implant region displacement was 5.66 ± 0.57 mm, with a length change of 5.64 ± 0.59 mm.
  • Electrode dislodgement forces averaged 60.9 ± 35.5 mN.
  • Five of six tested coil types successfully prevented electrode dislodgement, demonstrating effective strain relief.

Conclusions:

  • Understanding spinal biomechanics is critical for designing robust ISMS implants.
  • The developed coil-based strain relief mechanisms significantly enhance implant stability.
  • These findings provide crucial design guidance for mechanically stable ISMS implants intended for human clinical application.