Towards a smart experimental arena for long-term electrophysiology experiments
Uei-Ming Jow1, Mehdi Kiani, Xueliang Huo
1GT-Bionics Laboratory, School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30308, USA.
IEEE Transactions on Biomedical Circuits and Systems
|July 16, 2013
Summary
The EnerCage system enables wireless power and data transmission for freely behaving small animals in research. This system achieves efficient power transfer and regulation for long-term electrophysiology experiments without bulky batteries.
Area of Science:
- Biomedical Engineering
- Wireless Power Transfer
- Implantable Devices
Background:
- Wireless power and data transmission are crucial for perpetual data acquisition and stimulation in biomedical research.
- Existing systems often face limitations with freely moving subjects and require bulky batteries.
Purpose of the Study:
- To develop the EnerCage system for wireless power and data transmission to freely moving small animal subjects.
- To enable long-term electrophysiology experiments without subject-carried batteries.
Main Methods:
- Utilized scalable arrays of overlapping planar spiral coils (PSC) and 3-axis magnetic sensors for focused wireless power.
- Implemented a 3D non-line-of-sight localization algorithm for targeted power transmission.
- Designed a mobile unit with a magnetic tracer and closed-loop inductive power regulation.
Main Results:
- Achieved 19.6% power transfer efficiency (PTE) at significant horizontal misalignment (49.1 mm).
- Maintained 20 mW received power at the mobile unit despite variations in alignment, tilt, and distance.
- Demonstrated effective power transfer up to 120 mm operating height (5% PTE).
Conclusions:
- The EnerCage system provides a viable solution for untethered, long-term electrophysiology in freely behaving animals.
- The developed localization and power management strategies ensure reliable wireless power delivery in dynamic environments.
