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Updated: Feb 16, 2026
13:21
Graphene Coatings for Biomedical Implants
Published on: March 1, 2013
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Feasibility Study on Active Back Telemetry and Power Transmission Through an Inductive Link for Millimeter-Sized
IEEE Transactions on Biomedical Circuits and Systems
|January 3, 2018
Summary
This study demonstrates a wireless system for brain implants, enabling efficient power and data transfer for neural probes. The optimized inductive link achieves reliable communication within brain tissue.
Area of Science:
- Biomedical Engineering
- Implantable Devices
- Wireless Communication
Background:
- Free-floating neural probes require efficient wireless power and data transmission for distributed brain monitoring.
- Existing inductive link technologies face challenges in optimizing power transmission efficiency (PTE) and data rates for small implants.
Purpose of the Study:
- To present a feasibility study of a wireless power and data transmission system for a 1-mm² neural implant.
- To optimize the inductive link design for PTE, considering specific absorption rate (SAR) and data rate.
- To characterize the performance of the designed system, including data rate and bit error rate (BER).
Main Methods:
- Utilized a four-coil inductive link for back telemetry and a three-coil link for wireless power transmission.
- Developed a geometrical optimization procedure for the inductive link.
- Designed and implemented a low-power pulse-based active data transmission circuit.
- Characterized the PTE and BER in tissue media at 131 MHz.
Main Results:
- Achieved a measured PTE of 2.01% in tissue media at 131 MHz with a 1.8-cm coil separation.
- The 1-mm² data-Tx/power-Rx coil was implemented using insulated bonding wire.
- Measured BER at 1 Mbps was [specific value, if available] in air and [specific value, if available] in tissue.
Conclusions:
- The proposed optimized inductive link design is feasible for wireless power and data transmission to small neural implants.
- The system demonstrates potential for reliable communication in brain tissue for distributed neural probe applications.
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