{"title":"Safe SAR levels in inductively powered brain implanted visual prostheses","authors":"A. Al-Kalbani, M. Yuce, Jean-Michel Redouté","doi":"10.1109/EMCEUROPE.2012.6396784","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":377100,"journal":{"name":"International Symposium on Electromagnetic Compatibility - EMC EUROPE","volume":"19 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"9","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Symposium on Electromagnetic Compatibility - EMC EUROPE","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/EMCEUROPE.2012.6396784","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 9
Abstract
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.
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