title: Functions for detecting malposition of transcutaneous energy transmission coils.
abstract: A transcutaneous energy transmission system (TETS) for artificial hearts and ventricular assist devices uses electrical coupling of power between external and implanted coils. If the position of coils changes relative to each other, the TETS cannot feed the required power of the implanted device. During activity or sleep, the coils may move accidentally. TETS users and the people around them have to pay attention to this because the range of the position where the required power can be fed efficiently is not wide. Therefore, we added functions for the position changes of the coils to the TETS. Regular, cautious, and irregular positions were introduced, and the ranges of them were decided upon in our experiments. The cautious position was determined by the area where the change of the relative position of the coils was relatively small. When the coils were in the cautious position, the circuit was tuned by way of changing the resonant point. This modulation could give good power efficiency in the cautious position. When the coils were in the irregular position, an alarm switch was turned on. These functions ease the restriction of the coil position and give better quality of life (QOL) than do the conventional TETS.
authors.affiliation: Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan.
authors.forename: Toshinaga
authors.initials: T
authors.lastname: Ozeki
authors.forename: Tsuneo
authors.initials: T
authors.lastname: Chinzei
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Abe
authors.forename: Itsuro
authors.initials: I
authors.lastname: Saito
authors.forename: Takashi
authors.initials: T
authors.lastname: Isoyama
authors.forename: Shuuichi
authors.initials: S
authors.lastname: Mochizuki
authors.forename: Mitsuhiko
authors.initials: M
authors.lastname: Ishimaru
authors.forename: Koki
authors.initials: K
authors.lastname: Takiura
authors.forename: Atsushi
authors.initials: A
authors.lastname: Baba
authors.forename: Takahiro
authors.initials: T
authors.lastname: Toyama
authors.forename: Kou
authors.initials: K
authors.lastname: Imachi
mesh_terms: D001698:Biomedical Engineering; D011211:Electric Power Supplies / Q000009:adverse effects / Q000706:statistics & numerical data; D004582:Electronics, Medical; D006354:Heart, Artificial; D006353:Heart-Assist Devices; D006801:Humans; D066298:In Vitro Techniques; D011788:Quality of Life; D012867:Skin