Safe SAR levels in inductively powered brain implanted visual prostheses

EMC; SAR; Bio-heat; Biomedical implants; Blood flow; Body temperature; Class E; Finite integration technique; Head model; Human exposures; Inductively powered; Metabolic rates; Power transmitters; Safety standard; Self-oscillating; Transmitter circuits; Visual prosthesis; Electromagnetic compatibility; Electromagnetic fields; Finite difference method; Oscillators (electronic); Transmitters; Prosthetics

Abstract :

[en] This paper derives the health risks of an inductively powered brain implanted visual prosthesis with a CAD based head model. A high efficiency self-oscillating class E transmitter circuit operating at 5 MHz has been designed to wirelessly power the implant. The electromagnetic field inside the head model has been computed using Finite Integration Technique method. Simulations illustrate that a maximum localized SAR level averaged over 10 g attains 1.91 W/kg when the power transmission is equal to 1 W, which is just below the safe level specified at 2 W/kg. Using the same power transmitter, the temperature in the brain with and without considering bio-heat factors, such as blood flow and basal metabolic rate, increases respectively with 0.918 °C and 0.293 °C above the applied body temperature of 37 °C. © 2012 IEEE.

Disciplines :

Electrical & electronics engineering

Author, co-author :

Al-Kalbani, A. I.; Electrical and Computer Systems Engineering, Monash University, Clayton, VIC 3800, Australia

Yuce, M. R.; Electrical and Computer Systems Engineering, Monash University, Clayton, VIC 3800, Australia

Redouté, Jean-Michel ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes microélectroniques intégrés

Language :

English

Title :

Safe SAR levels in inductively powered brain implanted visual prostheses

Publication date :

2012

Event name :

International Symposium on Electromagnetic Compatibility, EMC EUROPE 2012

Event date :

17 September 2012 through 21 September 2012

Audience :

International

Journal title :

IEEE International Symposium on Electromagnetic Compatibility

ISSN :

1077-4076

Publisher :

Institute of Electrical and Electronics Engineers (IEEE), Piscataway, United States - New Jersey

Peer reviewed :

Peer reviewed

Commentary :

95036 9781467307185

Available on ORBi :

since 02 July 2019

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