Background: Many swimming micro-robots inspired by bacteria, could be used for different
medical applications including Nano-drugs delivery, micro surgery and minimally invasive diagnostic.
More patents on micro-robots for medical applications should be invented. Some research teams work
to design and produce micro-swimming-robots inspired by bacteria.
Objective: The purpose of this study was to simulate flagella motion. Also for better designs, the effects
of the geometrical ratios of flagellum on the non-dimensional propulsive force and nondimensional
velocity have been studied.
Methods: Bacterium as a kind of micro-organisms has an appropriate propulsive mechanism to be inspired
in medical applications. Flagella's helical motion creates a propulsive force and thus causes the
motion. We have simulated the dynamic of the propulsion mechanism of flagella using finite element
method. Flagella have been simulated in a long tube with a finite radius.
Results: For future patents design, the effects of the geometrical ratios of flagellum on the nondimensional
propulsive force and non-dimensional velocity have been studied. We have validated our
results with the results from experiment and Slender Body Theory.
Conclusion: In future, swimming micro-robots will be important tools in medicine. There are some
patents in this field. It was concluded that to reach maximum propulsive force, optimized ratios of
geometrical parameters should be used.