Feasibility Study on Active Back Telemetry and Power Transmission Through an Inductive Link for Millimeter-Sized Biomedical Implants

This paper presents a feasibility study of wireless power and data transmission through an inductive link to a 1-mm 2 implant, to be used as a free-floating neural probe, distributed across a brain area of interest. The proposed structure utilizes a four-coil inductive link for back telemetry, share...

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Bibliographic Details
Published in:IEEE transactions on biomedical circuits and systems 2017-12, Vol.11 (6), p.1366-1376
Main Authors: Yeon, Pyungwoo, Mirbozorgi, S. Abdollah, Lim, Jaemyung, Ghovanloo, Maysam
Format: Article
Language:English
Subjects:
Bit error rate
Brain
Brain models
Circuit design
Coils
Couplings
Data transmission
Design optimization
Equipment Design
Feasibility studies
Floating structures
Free-floating neural interfacing probes
Implants
Medical devices
mm-sized implantable medical devices
Neural networks
Power efficiency
Power transmission
Prostheses and Implants
pulse-based near-field transceiver
Surgical implants
Telemetry
Telemetry - methods
Tissues
Transmission circuits
Transmission efficiency
Transplants & implants
Wireless communication
Wireless power transmission
wireless power/data transmission
Wireless Technology - instrumentation
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Summary:This paper presents a feasibility study of wireless power and data transmission through an inductive link to a 1-mm 2 implant, to be used as a free-floating neural probe, distributed across a brain area of interest. The proposed structure utilizes a four-coil inductive link for back telemetry, shared with a three-coil link for wireless power transmission. We propose a design procedure for geometrical optimization of the inductive link in terms of power transmission efficiency (PTE) considering specific absorption rate and data rate. We have designed a low-power pulse-based active data transmission circuit and characterized performance of the proposed inductive link in terms of its data rate and bit error rate (BER). The 1-mm 2 data-Tx/power-Rx coil is implemented using insulated bonding wire with 25-μm diameter, resulting in measured PTE in tissue media of 2.01% at 131 MHz and 1.8-cm coil separation distance when the resonator coil inner radius is 1 cm. The measured BER at 1-Mbps data rate was 2.7 × 10 -6 and 5 × 10 -6 in the air and tissue environments, respectively.
ISSN:1932-4545
1940-9990
DOI:10.1109/TBCAS.2017.2775638