Non-Contact Driving Device of Artificial Heart and Its Magnetic Field Analysis

Abstract

In order to fundamentally overcome the fatal shortcomings of the existing artificial heart that it needs a passageway through the skin for the energy supply, and the energy conversion components giving out heat in the human body, we use the permanent magnet located outside human body as a non-contact driving device of a blood pump. Only the blood pump is implanted into the body and the remaining parts are outside the human body. The blood pump located in the body and the drive unit located outside the body have a pair of permanent magnet. When the active magnet outside of the body rotates, its magnetic field changes, so that the passive magnet in the body follows the rotating active magnet. Because the device's operating performance depends on the magnetic field distribution of the permanent magnets in space, so we have to do the study in-depth on the permanent magnet magnetic field distribution, as well as the interaction between the two permanent magnets. In this paper, we analyse and calculate the magnetic field distribution and drive-torque characteristics of permanent magnet using finite element method. This research on the drive mechanism and drive characteristics of the non-contact permanent magnet power transmission system has laid a theoretical foundation for the optimal design of an artificial heart with the permanent magnet driving device.