Abstract
A magnetic micromachine capable of moving in a liver was fabricated. It consisted of a stainless steel tip, a permanent magnet, and a spiral shape made with a tungsten wire. The magnet was magnetized in the direction of its diameter. The diameter of the machine was 0.9 mm, small enough for it to be inserted by means of a medical injector. When a rotational magnetic field was applied, the machine rotated and moved in a liver. According to our experimental results, the strongest force could be exerted by using two spirals, each with an angle of 60°. The micromachine was able to move a distance of 40 mm in a pig’s liver. It thus has great potential for medical applications.
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