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Author Spotlight: Innovative Methodology for Implanting and Securing Neural Probes in the Rodent Spinal Cord
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Fully implantable, battery-free wireless optoelectronic devices for spinal optogenetics
Vijay K Samineni1,2, Jangyeol Yoon3, Kaitlyn E Crawford3
1Washington University Pain Center and.
Pain
|July 13, 2017
Summary
Researchers developed a durable, implantable optoelectronic device for wireless spinal cord stimulation in freely moving animals. This innovation overcomes previous limitations, enabling long-term studies of neural circuits without restricting natural behavior.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Optogenetics
Background:
- Optogenetic tools provide insights into neuronal networks.
- Existing technologies face challenges in wireless powering and device durability for spinal cord studies in freely moving animals.
- Dynamic movements can degrade devices used for spinal cord circuit research.
Purpose of the Study:
- To demonstrate a fully implantable, wirelessly powered optoelectronic device for long-term spinal cord stimulation in untethered animals.
- To overcome mechanical durability and biofluid penetration challenges in spinal cord circuit research.
- To enable unconstrained natural behaviors during optogenetic studies.
Main Methods:
- Developed a thin, flexible, open-architecture optoelectronic device powered by near-field wireless communication.
- Integrated a microscale inorganic light-emitting diode (μ-ILED) on a flexible probe for implantation above the mouse spinal cord dura.
- Utilized wireless optogenetic activation of TRPV1-ChR2 afferents.
Main Results:
- The device demonstrated excellent mechanical durability and robust sealing against biofluid penetration.
- Sustained wireless activation and optical stimulation of spinal μ-ILEDs were achieved over several weeks to months.
- Optogenetic activation induced nocifensive behaviors and real-time place aversion in animals.
Conclusions:
- The developed system enables long-term, unconstrained optogenetic stimulation of spinal cord circuits in awake, freely moving animals.
- The low-cost, biocompatible, and robust device offers broad applicability for future studies of spinal and peripheral targets.
- This technology addresses limitations of current approaches in untethered animal research.
