Shape Memory Alloy Helical Microrobots with Transformable Capability towards Vascular Occlusion Treatment

Area of Science:

• Biomedical Engineering
• Materials Science
• Robotics

Background:

• Minimally invasive biomedical applications using microrobots are a significant goal.
• Previous microrobots often lack functional versatility, performing only single tasks or basic locomotion.
• Effective functionalization of microrobots for complex biomedical tasks remains a challenge.

Purpose of the Study:

• To propose a novel biocompatible helical microrobot with regulative structure transformation.
• To demonstrate precise control over microrobot motion behavior and mechanical properties.
• To present a fundamental solution strategy for vascular occlusion using microrobots.

Main Methods:

• Development of a biocompatible shape memory alloy helical microrobot.
• Utilizing shape memory effect for regulative structure transformation.
• Demonstrating untethered manipulation for microsurgical applications.

Main Results:

• The microrobots exhibit precise control over thrust and torque via structural adjustments.
• The helical microrobots function effectively as microdrillers for unclogging efficiency.
• The expandable helical tail demonstrates self-propulsive stent capabilities using high work energy.

Conclusions:

• Shape-transformable microrobots offer a versatile platform for biomedical applications.
• The proposed strategy enables functionalization through accurate tuning of structure, motion, and mechanical properties.
• This study opens new avenues for advanced untethered microsurgery with minimal damage.