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Implantation of Optoelectronic Devices in the Rodent Spinal Cord
Published on: July 12, 2024
Floating light-activated microelectrical stimulators tested in the rat spinal cord
Ammar Abdo1, Mesut Sahin, David S Freedman
1Biomedical Engineering Department, New Jersey Institute of Technology, NJ, USA.
Journal of Neural Engineering
|September 15, 2011
Summary
Wireless neural stimulation using floating light-activated microelectrical stimulators (FLAMES) overcomes wire breakage issues. These devices, activated by near-infrared laser pulses, show promise for long-term spinal cord stimulation in rats.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Materials Science
Background:
- Long-term neural stimulation implants face challenges with wire breakage and tissue response.
- Eliminating wire interconnects is crucial for improving implant longevity.
Purpose of the Study:
- To introduce and evaluate a novel wireless neural stimulation system called FLAMES.
- To assess the efficacy and feasibility of FLAMES for intraspinal microstimulation.
Main Methods:
- Fabrication of microstimulators with cascaded GaAs p-i-n photodiodes.
- In vivo testing in rat spinal cords using near-infrared (NIR) laser pulses for wireless activation.
- Measurement of elicited forces in the rat forelimb to quantify stimulation effectiveness.
Main Results:
- FLAMES successfully generated significant stimulus currents (up to 1.08 N) for motor function in rats.
- The system demonstrated effectiveness for deep intraspinal microstimulation.
- Stimulation threshold showed robustness against minor displacements of the optical power source.
Conclusions:
- FLAMES offers a viable wireless solution for neural stimulation, addressing limitations of traditional wired electrodes.
- The technology holds potential for improved long-term neural implant performance.
- Further research can explore optimized designs for enhanced wireless power transfer and stimulation control.
