Abstract
The final goal the development of artificial organs is to implant completely inside the body. One of the obstacles to realize this purpose is how to develop an enrgy source. Especially, it is more serious for an artificial organ such as artificial heart in which a large energy is required. There are two methods to supply energy to an artificial organs implanted inside the body. 1) To implant an energy source inside the body. 2) To transmit the energy to the inside from an energy source carried outside the body. In this paper, it will be mentioned about the present status of enrgy sources and enrgy transmission.