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Feasibility of Neural Stimulation With Floating-Light-Activated Microelectrical Stimulators
1Biomedical Engineering Department, New Jersey Institute of Technology, Newark, NJ 07102 USA.
IEEE Transactions on Biomedical Circuits and Systems
|May 10, 2011
Summary
Floating, light-activated microelectrical stimulators (FLAMES) offer a wireless solution for neural stimulation. This study demonstrates their feasibility for restoring central nervous system functions, suggesting potential for brain and spinal cord activation.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Optoelectronics
Background:
- Traditional neural microstimulation relies on microelectrode arrays, which are prone to failure due to vulnerable interconnects.
- Restoring central nervous system functions necessitates advanced neural prosthetic devices with improved reliability.
- Wireless neural stimulation offers a promising alternative to overcome the limitations of wired implants.
Purpose of the Study:
- To investigate the feasibility of Floating-Light-Activated Microelectrical Stimulators (FLAMES) for wireless neural stimulation.
- To develop and simulate microstimulators for neural activation in human gray and white matter.
- To assess the potential of FLAMES as a reliable alternative to traditional neural implants.
Main Methods:
- Computer modeling was employed to simulate FLAMES performance in neural tissue.
- Photon densities and temperature elevations were calculated for near-infrared (NIR) laser activation.
- Laser power was adjusted to maintain a maximum temperature increase of 0.5 °C in neural tissues.
- Device parameters were analyzed to optimize FLAMES size and output voltage.
Main Results:
- Simulations demonstrated the feasibility of NIR laser activation for neural tissue.
- Optimal laser power levels were determined for gray (325 mW/cm²) and white matter (250 mW/cm²).
- Device area was found to increase with most parameters but decrease with output voltage.
- Minimizing device size is achievable by adjusting the number of series photodiodes.
Conclusions:
- Floating, optically activated stimulators (FLAMES) are feasible for wireless neural stimulation.
- Submillimeter-sized FLAMES show potential for activating the brain cortex and spinal cord.
- This technology offers a promising avenue for developing more reliable and effective neural prosthetics.
