Artifical Pumping of Heart Using Transcutaneous Transformer

Topics: Transformer, Magnetic field, Inductor Pages: 6 (1756 words) Published: January 26, 2013
410E161,III BE EEE,PSG COLLEGE OF TECHNOLOGY,COIMBATORE., 8973394727, 9442980629 , 9976356737 ,9940992506

A power supply system using a transcutaneous transformer to power an artificial heart through intact skin is presented in this paper. With the number of cardiac patients increasing dramatically each year, the potential for development of implantable circulatory assist devices is remarkable. Such circulatory assist devices consist of totally artificial hearts and ventricular assist devices. In order to realize both high-voltage gain and minimum circulating current, compensation of leakage inductances on both sides of a transcutaneous transformer is proposed. A frequency region which realizes the robustness against coupling coefficient and load variation is identified. In this region, the converter has inherent advantages such as zero voltage switching (ZVS) or zero-current switching (ZCS) of the switches, high-voltage gain, minimum circulating current and high efficiency.

Keywords: Artificial heart—Transcutaneous energy transmission—Magnetic field immunity of the system. Introduction:
With the rapid development of life science and bio-engineering, the research of implanted medical device, especially the totally artificial heart (TAH), has made great progress, and the TAH with the character of miniaturization, durability and low-resistance, might be used as widely as the artificial pacemaker. With the development and improvement of this technology, non-invasion and low-risk treatment in medical field will be further promoted, thus it has great research value and application prospect. In this paper the TETS, which consists of the transcutaneous energy transmission through intact skin to power a TAH, has been designed and built. Here a transcutaneous transformer transmits driving energy to an artificial heart implanted inside the body by using electromagnetic induction between two coils inside and outside the body. IH cookers generate a magnetic flux, and if a cooker is operated near a transcutaneous transformer, the magnetic flux generated will link with the transformer’s external and internal coils. This can affect the performance of the TET system and the artificial heart system. Hence, it is necessary to investigate the magnetic-field immunity of the TET system. TET System:

The TET system allows the non invasive transmission of energy to the inside of the body. Figure 1 displays a block diagram of the TET system. Outside the body, DC electric power that is supplied by a stabilized DC power supply or an external rechargeable battery is converted into high-frequency (300 kHz) AC electric power by a push-pull-type inverter circuit. The AC electric power is transmitted to the inside of the body through the transcutaneous transformer, as shown in Figure 1. The transcutaneous transformer consists of an external coil and an internal coil, of nine turns each, using Litz wire. Two primary coils outside the body are closely wound in the toroidal-type ferrite. To detach a coil outside the body easily, the ferritic core combined two ferrites of the character type C. The half of the annulus ring of the coil that is inside the body (nine turns) was buried under the hypodermis, and the remaining half was wrapped with the skin and thrust out like an arch (Figure2). Figure2 shows an installation of the passing skin transformer on a goat.

Figure 1: Block diagram of TET system.

Figure 2: Transcutaneous transformer.

Inside the body, AC electric...

References: 1. T. Yamamoto, K. Koshiji, K. Tsukahara, et al., “An externally-coupled transcutaneous energy transmission system for totally implantable artificial hearts-detection of abnormal coupling caused by misalignment and air gap in the ferrite core junction of the transcutaneous transformer, “Transaction of Japanese Society for Medical and Biological Engineering, vol. 43, no. 2, pp. 261–267, 2005.
2. T. Yamamoto, K. Koshiji, Y. Nawa, et al., “Transcutaneous energy transmission system for a totally-implantable artificial heart in case using external battery,” in Proceedings of the World Congress on Medical Physics and Biomedical Engineering, pp. 3026–3029, 2006.
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