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Film-based Implants for Supporting Neuron-Electrode Integrated Interfaces for The Brain.

Min D Tang-Schomer1, Xiao Hu2, Marie Tupaj1

  • 1Tufts University, Department of Biomedical Engineering, Medford, MA 02155.

Advanced Functional Materials
|November 12, 2014
PubMed
Summary

This study developed novel silk-film brain implants integrating neurons and electrodes for enhanced brain-machine interfaces. These implants improve cell survival and provide stable, long-term neural modulation with minimal inflammation.

Keywords:
brain implantcalcium imagingelasticityelectrical stimulationmicropatterningsilksurface topography

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Area of Science:

  • Neural Engineering
  • Biomaterials Science
  • Neuroscience

Background:

  • Brain-machine interfaces (BMIs) offer potential for modulating neural functions.
  • Long-term BMIs face challenges with graft cell survival and electrode sensitivity.
  • Silk films present a promising substrate for neural implants due to their biocompatibility and mechanical properties.

Purpose of the Study:

  • To develop integrated neuron-electrode interfaces on flexible silk films for brain implants.
  • To optimize silk film properties for enhanced cell survival and neural circuit integration.
  • To evaluate the performance and biocompatibility of these implants in vivo.

Main Methods:

  • Silk films were fabricated with optimized mechanical properties and surface topography.
  • Primary rat cortical cells were cultured and aligned on silk films.
  • Compartmentalized neural circuits and electrode arrays were integrated onto the silk films.
  • Electrical stimulation and calcium imaging were used to assess neural activity.
  • Silk film implants were tested in mice brains to evaluate biocompatibility and stability.

Main Results:

  • Optimized silk films promoted survival and alignment of cortical neurons.
  • Integrated neuron-electrode interfaces on silk films demonstrated electrical stimulation capabilities.
  • Silk film implants in mice showed conformal contact, modulated host brain cells, and exhibited minimal inflammation.
  • Stable indwelling of implants was observed for several weeks.

Conclusions:

  • Integrated silk film implants offer a viable approach for sustained functional brain-machine interfaces.
  • Combining cell therapy with brain electrodes on silk films enables precise ex vivo control of neural activity.
  • This technology holds promise for advanced neural prosthetics and therapeutic interventions.