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An implantable power supply with an optically rechargeable lithium battery

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4 Author(s)
Goto, Kazuya ; Dept. of Appl. Phys., Osaka Univ., Japan ; Nakagawa, Tetsuya ; Nakamura, O. ; Kawata, S.

A novel power supply for medical implants has been developed. A wireless near-infrared power transmission recharges a lithium secondary battery in the power supply. A photovoltaic cell array embedded under skin receives near-infrared light through the skin and charges the battery directly powering an implanted device. The authors have shown that, for a photodiode area of 2.1 cm 2, 17 min of near-infrared irradiation at a 810-mn wavelength with a power density of 22 mW/cm 2 can send enough energy to allow regular commercial cardiac pacemakers to run for 24 h. The temperature rise of the skin during the light irradiation was 1.4°C.

Published in:

Biomedical Engineering, IEEE Transactions on  (Volume:48 ,  Issue: 7 )