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Improvement of wireless power transmission efficiency of implantable subcutaneous devices by closed magnetic circuit mechanism

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Abstract

Induction coils were fabricated based on flexible printed circuit board for inductive transcutaneous power transmission. The coil had closed magnetic circuit (CMC) structure consisting of inner and outer magnetic core. The power transmission efficiency of the fabricated device was measured in the air and in vivo condition. It was confirmed that the CMC coil had higher transmission efficiency than typical air-core coil. The power transmission efficiency during a misalignment between primary coil and implanted secondary coil was also evaluated. The decrease of mutual inductance between the two coils caused by the misalignment led to a low efficiency of the inductive link. Therefore, it is important to properly align the primary coil and implanted secondary coil for effective power transmission. To align the coils, a feedback coil was proposed. This was integrated on the backside of the primary coil and enabled the detection of a misalignment of the primary and secondary coils. As a result of using the feedback coil, the primary and secondary coils could be aligned without knowledge of the position of the implanted secondary coil.

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Acknowledgments

This research was supported by the Public Welfare and Safety research program through the National Research Foundation of Korea (NRF) that was funded by the Ministry of Education, Science and Technology (2010-0020714) and Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology(2009-0093823).

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Authors and Affiliations

  1. School of Mechanical Engineering, Yonsei University, Seoul, Korea

    Sung-Eun Jo, Sanghoon Joung & Yong-Jun Kim

  2. The Center for Bionics KIST, Seoul, Korea

    Sanghoon Joung & Jun-Kyo Francis Suh

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  1. Sung-Eun Jo
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  2. Sanghoon Joung
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  3. Jun-Kyo Francis Suh
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  4. Yong-Jun Kim
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Correspondence to Yong-Jun Kim.

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Jo, SE., Joung, S., Suh, JK.F. et al. Improvement of wireless power transmission efficiency of implantable subcutaneous devices by closed magnetic circuit mechanism. Med Biol Eng Comput 50, 973–980 (2012). https://doi.org/10.1007/s11517-012-0939-z

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  • DOI: https://doi.org/10.1007/s11517-012-0939-z

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