DocumentCode :
948539
Title :
Thermal Impact of an Active 3-D Microelectrode Array Implanted in the Brain
Author :
Kim, Sohee ; Tathireddy, Prashant ; Normann, Richard A. ; Solzbacher, Florian
Author_Institution :
Utah Univ., Salt Lake City
Volume :
15
Issue :
4
fYear :
2007
Firstpage :
493
Lastpage :
501
Abstract :
A chronically implantable, wireless neural interface device will require integrating electronic circuitry with the interfacing microelectrodes in order to eliminate wired connections. Since the integrated circuit (IC) dissipates a certain amount of power, it will raise the temperature in surrounding tissues where it is implanted. In this paper, the thermal influence of the integrated 3-D Utah electrode array (UEA) device implanted in the brain was investigated by numerical simulation using finite element analysis (FEA) and by experimental measurement in vitro as well as in vivo. The numerically calculated and experimentally measured temperature increases due to the UEA implantation were in good agreement. The experimentally validated numerical model predicted that the temperature increases linearly with power dissipation through the UEA, with a slope of 0.029degC/mW over the power dissipation levels expected to be used. The influences of blood perfusion, brain metabolism, and UEA geometry on tissue heating were also investigated using the numerical model.
Keywords :
biological tissues; biomedical electrodes; biomedical electronics; biothermics; brain; finite element analysis; microelectrodes; prosthetics; active 3-D microelectrode array; blood perfusion; brain; finite element analysis; heating; implantation; integrated 3-D Utah electrode array device; integrating electronic circuitry; metabolism; numerical model; power dissipation; tissues; wireless neural interface device; Finite element analysis (FEA); Utah Electrode Array (UEA); Utah electrode array (UEA); finite element analysis (FEA); microelectrode; neural interface; neuroprosthesis; temperature increase; thermal impact; Animals; Brain; Cats; Cerebral Cortex; Cerebrovascular Circulation; Electrodes, Implanted; Equipment Design; Humans; Kinetics; Microelectrodes; Microscopy, Electron, Scanning; Prostheses and Implants; Thermodynamics;
fLanguage :
English
Journal_Title :
Neural Systems and Rehabilitation Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
1534-4320
Type :
jour
DOI :
10.1109/TNSRE.2007.908429
Filename :
4359231
Link To Document :
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