2510 Air-core type transcutaneous energy transmission system for an artificial heart : Controlling and stabilizing the output voltage using primary coil current

Suyama, Kenji; Nukaya, Masayuki; Sakane, Akira; Tsuji, Takao; Koshiji, Kohji

doi:10.1299/jsmeiip.2005.359

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This method can allow patients mobility, improved quality of life (QOL), and reduced risk of infection relative to percutaneous connections. Various types of transcutaneous transformers exist, such as air-core [4]- [9], air-core with amorphous wires [10] and externally coupled [11]. The air-core transcutaneous transformer is thin and lightweight; therefore, it is possible to implant it in an aesthetically pleasing manner.…”

Section: Introductionmentioning

confidence: 99%

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

Suyama

Nukaya

Tsuji

et al. 2008

IEEE Trans. Biomed. Eng.

View full text Add to dashboard Cite

Abstract-This paper reports on the current density and specific absorption rate (SAR) analysis of biological tissue surrounding an air-core transcutaneous transformer for an artificial heart. The electromagnetic field in the biological tissue is analyzed by the transmission line modeling method, and the current density and SAR as a function of frequency, output voltage, output power, and coil dimension are calculated. The biological tissue of the model has three layers including the skin, fat, and muscle. The results of simulation analysis show SARs to be very small at any given transmission conditions, about 2-14 mW/kg, compared to the basic restrictions of the International Commission on nonionizing radiation protection (ICNIRP; 2 W/kg), while the current density divided by the ICNIRP's basic restrictions gets smaller as the frequency rises and the output voltage falls. It is possible to transfer energy below the ICNIRP's basic restrictions when the frequency is over 250 kHz and the output voltage is under 24 V. Also, the parts of the biological tissue that maximized the current density differ by frequencies; in the low frequency is muscle and in the high frequency is skin. The boundary is in the vicinity of the frequency 600-1000 kHz.

show abstract

Section: Introductionmentioning

confidence: 99%

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

Suyama

Nukaya

Tsuji

et al. 2008

IEEE Trans. Biomed. Eng.

View full text Add to dashboard Cite

show abstract

“…The first air-core transcutaneous transformers were developed in the early 1960s (4). Attempts have been made to design efficient air-core transcutaneous transformers that can operate under a wide range of conditions (6). However, in order to use this system for practical applications, it is necessary to investigate the electromagnetic influence of the TETS on biological tissue.…”

mentioning

confidence: 99%

“…Hence, there is risk of infection in the region in the body where a wire passes through the skin and a consequent deterioration of quality of life (QOL) (3). Therefore, a transcutaneous energy transmission system (TETS) that transfers energy to the artificial heart by electromagnetic induction between the two air‐core coils of a transcutaneous transformer has been developed; these air‐core coils are placed facing each other on either side of the abdomen or chest (4–9). With the abovementioned TETS, QOL can be improved and the risk of infection due to percutaneous connections can be reduced.…”

mentioning

confidence: 99%

Analysis of Specific Absorption Rate and Current Density in Biological Tissues Surrounding Energy Transmission Transformer for an Artificial Heart: Using Magnetic Resonance Imaging‐based Human Body Model

Higaki

Suyama

2010

Artificial Organs

Self Cite

View full text Add to dashboard Cite

The transcutaneous energy transmission system used for artificial hearts is a transmission system that uses electromagnetic induction. Use of the TETS improves quality of life and reduces the risk of infection caused by percutaneous connections. This article reports the changes in the electromagnetic effects of TETS that influence a human body when the locations of the air-core coils of the transcutaneous transformer are changed. The specific absorption rate and current density in a model consisting of a human trunk that included 24 different organs are analyzed using an electromagnetic simulator. The air-core coils are located on the pectoralis major muscle near the collarbone in model 1, whereas they are located on the axillary region of the serratus anterior muscle, which overlies the rib in model 2. The maximum current densities in models 1 and 2 are 5.2 A/m(2) and 6.1 A/m(2), respectively. The current density observed in model 2 slightly exceeds the limiting value prescribed by International Commission on Non-Ionizing Radiation Protection (ICNIRP). When the volumes of biological tissues whose current densities exceed the limiting value of current density for general public exposure are compared, the volume in model 2 (156.1 cm(3)) is found to be larger than that in model 1 (93.7 cm(3)). Hence, it is speculated that the presence of the ribs caused an increase in the current density. Therefore, it is concluded that model 1 satisfies the ICNIRP standards.

show abstract

2510 Air-core type transcutaneous energy transmission system for an artificial heart : Controlling and stabilizing the output voltage using primary coil current

Cited by 2 publications

References 0 publications

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

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

Analysis of Specific Absorption Rate and Current Density in Biological Tissues Surrounding Energy Transmission Transformer for an Artificial Heart: Using Magnetic Resonance Imaging‐based Human Body Model

Contact Info

Product

Resources

About