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MRI driven magnetic microswimmers.

Gábor Kósa1, Péter Jakab, Gábor Székely

  • 1School of Mechanical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel. gkosa@post.tau.ac.il

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This study introduces a novel magnetic micro-swimmer for capsule endoscopy, powered wirelessly by MRI. The system achieves propulsion and imaging without significant artifact, enabling targeted diagnosis in the digestive system.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Robotics

Background:

  • Capsule endoscopy offers a non-invasive method for diagnosing gastrointestinal diseases.
  • Current capsule endoscopy lacks active propulsion and precise navigation capabilities.
  • Magnetic Resonance Imaging (MRI) provides powerful magnetic fields and imaging modalities.

Purpose of the Study:

  • To design and characterize a miniature swimming mechanism for capsule endoscopy.
  • To utilize MRI's static and radio frequency (RF) magnetic fields for capsule propulsion and wireless powering.
  • To evaluate the propulsion performance and assess imaging compatibility.

Main Methods:

  • Development of a miniature swimming mechanism with variable tail designs.
  • Experimental characterization of propulsive force under different tail configurations and MRI parameters.
  • Analysis of magnetic field interactions and imaging artifacts during capsule propulsion.
  • Evaluation of the system's performance within a 3 Tesla (T) MRI scanner.

Main Results:

  • A 20 mm long, 5 mm wide swimming tail generated 0.21 mN propulsive force in water.
  • Propulsion was achieved using a 20 Hz signal delivering 0.85 mW power.
  • The system demonstrated self-propulsion speeds of several millimeters per second.
  • Minimal imaging artifacts allowed for capsule localization during active propulsion.

Conclusions:

  • The developed magnetic micro-swimmer, powered by MRI, enables wireless propulsion and powering for capsule endoscopy.
  • The system is compatible with MRI imaging, allowing for real-time tracking without significant image degradation.
  • This technology holds potential for targeted diagnosis and intervention within the gastrointestinal tract, particularly the stomach.