Analysis of Current Density and Specific Absorption Rate in Biological Tissue Surrounding an Air-core Type of Transcutaneous Transformer for an Artificial Heart

This paper reports on the specific absorption rate (SAR) and the current density analysis of biological tissue surrounding an air-core type of transcutaneous transformer for an artificial heart. The electromagnetic field in the biological tissue surrounding the transformer was analyzed by the transm...

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Published in2006 International Conference of the IEEE Engineering in Medicine and Biology Society Vol. 2006; pp. 5392 - 5395
Main Authors Shiba, K., Nukaya, M., Tsuji, T., Koshiji, K.
Format Conference Proceeding Journal Article
LanguageEnglish
Published United States IEEE 2006
Subjects
Absorption
Air
Artificial heart
Biological system modeling
Biological tissues
Current density
Electric Conductivity
Electromagnetic analysis
Electromagnetic Fields
Equipment Design
Frequency
Heart, Artificial
Humans
Models, Theoretical
Muscles
Muscles - pathology
Radiation
Radiation Dosage
Radio Waves
Radiometry
Skin
Skin - pathology
Specific absorption rate
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Summary:This paper reports on the specific absorption rate (SAR) and the current density analysis of biological tissue surrounding an air-core type of transcutaneous transformer for an artificial heart. The electromagnetic field in the biological tissue surrounding the transformer was analyzed by the transmission-line modeling method, and the SAR and current density as a function of frequency (200k-1 MHz) for a transcutaneous transmission of 20 W were calculated. The model's biological tissue has three layers including the skin, fat and muscle. As a result, the SAR in the vicinity of the transformer is sufficiently small and the normalized SAR value, which is divided by the ICNIRP's basic restriction, is 7times10 -3 or less. On the contrary, the current density is slightly in excess of the ICNIRP's basic restrictions as the frequency falls and the output voltage rises. Normalized current density is from 0.2 to 1.2. In addition, the layer in which the current's density is maximized depends on the frequency, the muscle in the low frequency (<700kHz) and the skin in the high frequency (>700kHz). The result shows that precision analysis taking into account the biological properties is very important for developing the transcutaneous transformer for TAH
ISBN:9781424400324
1424400325
ISSN:1557-170X
DOI:10.1109/IEMBS.2006.260022