|Equitranslational and Axially Rotational Microrobot using Electromagnetic Actuation System
Hyunchul Choi, Semi Jeong, Gwangjun Go, Cheong Lee, Jin Zhen, Seong Young Ko, Jong-Oh Park* and Sukho Park*
International Journal of Control, Automation, and Systems, vol. 15, no. 3, pp.1342-1350, 2017
Abstract : "Recently, many researchers have focused on wireless microrobots as therapeutic agents for active drug
delivery. Owing to their size limitation, they cannot be equipped with actuators/sensors, controllers and batteries.
Therefore, external devices (magnetic field generator, position recognition devices, and control system) are used
to realize the main functions (locomotion, sensing, and therapy) of biomedical microrobots and thus, to minimize
their size. Especially, the small wireless microrobots, inserted into the human body, should have various steering,
locomotive, and therapeutic functions for diagnosis and treatment. Generally, an external magnetic field is widely
used for the locomotion of a wireless microrobot. However, microrobots using an external magnetic field cannot
simultaneously realize equitranslational and axial rotational motions in the same microrobot system. In this paper,
we developed an electromagnetic actuation (EMA) system and a spiral-shape microrobot and proposed its actuating
algorithm. The developed wireless microrobot can show equitranslation and axial rotation in the same microrobot
system. Finally, various experiments in a test-bed and in a blood vessel phantom validated that the developed
microrobot can move to a target position by equitranslation and can penetrate a thrombus model by axial rotation."
Axial rotation, drilling, electromagnetic, equitranslation, Helmholtz coil, microrobot, saddle coil.