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Summary

Remotely activated floating micro-stimulators offer a solution to chronic tissue response in neural prosthetics. These devices, powered by near-infrared laser beams, show feasibility for high-frequency neural stimulation applications.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Materials Science

Background:

  • Chronic tissue response to microelectrode implants is a significant challenge for neural prosthetic development.
  • Mechanical stress from interconnects causes neural tissue damage, limiting device longevity.
  • Remotely activated floating micro-stimulators eliminate the need for physical interconnects.

Purpose of the Study:

  • To investigate the feasibility of using near-infrared (NIR) laser beams for powering remotely activated floating micro-stimulators (FLAMES).
  • To evaluate the voltage generation and performance of FLAMES in response to pulsed NIR laser excitation.
  • To assess the potential of this technology for neural stimulation applications requiring wireless power transfer.

Main Methods:

  • Fabrication of FLAMES with integrated silicon PIN photodiodes in various sizes (120x300x100 µm to 200x500x100 µm).
  • Bench testing of FLAMES using 850nm excitation from a Ti:Sapphire laser.
  • Experimental measurement of the voltage field generated by FLAMES in saline solution under pulsed NIR laser stimulation.

Main Results:

  • FLAMES generated a peak voltage of approximately 196mV at the cathodic contact in response to a single NIR laser pulse.
  • Continuous stimulation at 100Hz resulted in a sustained peak voltage of around 141mV.
  • The voltage output demonstrated stability and feasibility for pulsed operation up to 100Hz.

Conclusions:

  • Remotely powered FLAMES are a viable alternative to traditional microelectrodes, mitigating chronic tissue response.
  • NIR laser-based power transfer offers a promising wireless solution for neural stimulator applications.
  • The demonstrated voltage output supports the potential of FLAMES for future neural prosthetic development.