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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Medical Devices

Background:

  • Implanted brain-computer interfaces (iBCIs) offer a pathway for individuals with severe disabilities to control digital devices.
  • Long-term, reliable neural signal acquisition is essential for the effectiveness and feasibility of iBCIs.
  • This research evaluates the signal characteristics and stability of an endovascular stent-electrode array over one year post-implantation.

Purpose of the Study:

  • To investigate the long-term signal stability and characteristics of an endovascular iBCI.
  • To assess the feasibility of using iBCIs for continuous neural recording in a home environment.
  • To evaluate the performance of a stent-electrode array over a 1-year period.

Main Methods:

  • Five participants with paralysis were enrolled in an early feasibility clinical trial of an endovascular iBCI.
  • A 16-channel stent-electrode array was implanted in the superior sagittal sinus to record from the motor cortices.
  • Neural activity was recorded during home-based sessions, quantifying motor signal strength, resting state features, and electrode impedances over time.

Main Results:

  • Sustained differentiation between rest and attempted movement states was observed in high-frequency bands (30-200 Hz).
  • Motor-related neural activity modulation persisted over the 1-year study period.
  • Most electrode channels showed stable impedance and resting state band power without significant changes over time.

Conclusions:

  • Endovascular iBCIs demonstrate suitability for long-term neural signal acquisition in home settings.
  • The stent-electrode array successfully recorded movement-related neural modulation for over one year.
  • These results support the potential of endovascular BCIs for restoring digital independence in individuals with paralysis.