Title :
An implantable power supply with an optically rechargeable lithium battery
Author :
Goto, Kazuya ; Nakagawa, Tetsuya ; Nakamura, Osamu ; Kawata, Satoshi
Author_Institution :
Dept. of Appl. Phys., Osaka Univ., Japan
fDate :
7/1/2001 12:00:00 AM
Abstract :
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.
Keywords :
biomedical electronics; lithium; pacemakers; photodiodes; photovoltaic cells; prosthetic power supplies; secondary cells; 17 min; 24 h; 810 nm; Li; embedded photovoltaic cell array; implantable power supply; light irradiation; lithium secondary battery recharging; medical implants; near-infrared irradiation; near-infrared light; optically rechargeable lithium battery; regular commercial cardiac pacemakers; skin; temperature rise; wireless near-infrared power transmission; Batteries; Biomedical optical imaging; Implants; Lithium; Optical arrays; Photodiodes; Photovoltaic cells; Power supplies; Power transmission; Skin; Animals; Electric Power Supplies; Equipment Design; Humans; Infrared Rays; Lithium; Pacemaker, Artificial; Prostheses and Implants; Rats;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
