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A wireless power transmission system for implantable devices in freely moving rodents

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Abstract

Reliable wireless power delivery for implantable devices in animals is highly desired for safe and effective experimental use. Batteries require frequent replacement; wired connections are inconvenient and unsafe, and short-distance inductive coupling requires the attachment of an exterior transmitter to the animal’s body. In this article, we propose a solution by which animals with implantable devices can move freely without attachments. Power is transmitted using coils attached to the animal’s cage and is received by a receiver coil implanted in the animal. For a three-dimensionally uniform delivery of power, we designed a columnar dual-transmitter coil configuration. A resonator-based inductive link was adopted for efficient long-range power delivery, and we used a novel biocompatible liquid crystal polymer substrate as the implantable receiver device. Using this wireless power delivery system, we obtain an average power transfer efficiency of 15.2 % (minimum efficiency of 10 % and a standard deviation of 2.6) within a cage of 15 × 20 × 15 cm3.

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Acknowledgments

This research was supported by the Pioneer Research Center Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (NRF-2009-0082961), Public Welfare & Safety research program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (NRF-2010-0020851), Technology Innovation Program (10033657) of the Ministry of Knowledge Economy (MKE), and IC Design Education Center (IDEC), KAIST. Brain Korea 21 Project for Medical Science and Brain Research Institute, Yonsei University College of Medicine, Seoul, Korea.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, Nanobioelectronics and Systems Lab, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea

    Kyungsik Eom, Joonsoo Jeong, Tae Hyung Lee, Junghoon Kim, Sung Eun Lee & Sung June Kim

  2. Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Republic of Korea

    Jinhyung Kim

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  1. Kyungsik Eom
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  2. Joonsoo Jeong
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Correspondence to Sung June Kim.

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Eom, K., Jeong, J., Lee, T.H. et al. A wireless power transmission system for implantable devices in freely moving rodents. Med Biol Eng Comput 52, 639–651 (2014). https://doi.org/10.1007/s11517-014-1169-3

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