Bio-inspired magnetic swimming microrobots for biomedical applications

Area of Science:

• Biomedical Engineering
• Robotics
• Fluid Dynamics

Background:

• Microrobots offer potential for navigating viscous biological fluids.
• Locomotion strategies are inspired by nature, particularly at low Reynolds numbers.
• Helical propulsion, mimicking E. coli bacteria, is a key area of research.

Purpose of the Study:

• To review swimming methods for microrobots.
• To analyze magnetic actuation techniques for microrobotic propulsion.
• To discuss swarm and multi-agent control strategies for microrobot applications.

Main Methods:

• Review of biomimetic and non-biomimetic microrobotic locomotion.
• Analysis of magnetic actuation methods: rotating fields, oscillating fields, and field gradients.
• Investigation of force-driven versus torque-driven actuation scalability.
• Exploration of swarm control and frequency-dependent behavior.

Main Results:

• Torque-driven actuation demonstrates better scalability for micro- and nano-scale microrobots compared to force-driven methods.
• Preliminary results show successful decoupling of individual microrobots within a swarm.
• Frequency-dependent behavior of helical microrobots is crucial for swarm coordination.

Conclusions:

• Helical propulsion and torque-driven magnetic actuation are promising for microrobot development.
• Swarm control enhances the utility of microrobots for in vivo and in vitro applications.
• Further research into multi-agent control is essential for realizing complex microrobotic systems.