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NIR-II Light-Activated Neurostimulation Enabled by Broad-Angle Light Concentrating.

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Researchers developed a new light-activated neurostimulator using near-infrared (NIR-II) light for precise, wireless control. This battery-free device offers a minimally invasive approach for treating neurological disorders with improved reliability in deep tissues.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Optoelectronics

Background:

  • Current implantable neurostimulators face limitations in reliability due to tissue optical properties and alignment issues.
  • Wireless, battery-free control is highly desirable for long-term therapeutic applications.

Purpose of the Study:

  • To develop a novel neurostimulation system utilizing the deep tissue penetration of NIR-II light.
  • To overcome limitations of existing light-based neuromodulation systems through enhanced light harvesting and energy conversion.

Main Methods:

  • Integration of photothermal and pyroelectric energy conversion mechanisms.
  • Development of a flower-inspired, broad-angle, lens-free light concentrator for efficient light capture.
  • Utilizing pulsed 1064 nm NIR-II laser for activation.

Main Results:

  • Demonstrated efficient harvesting of scattered NIR-II light deep within tissues.
  • Achieved a high voltage-to-volume output ratio through synergistic energy conversion.
  • Confirmed biocompatibility and precise nerve activation in vitro and in vivo (frogs and rabbits).

Conclusions:

  • Established a robust, miniaturized, and minimally invasive system for light-controlled neuromodulation.
  • Showcased immediate, light-triggered electrical stimulation of the sciatic nerve in rabbits.
  • The technology holds broad applicability for next-generation bioelectronic systems and neurological disorder treatments.