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A Tumbling Magnetic Microrobot System for Biomedical Applications.

Elizabeth E Niedert1, Chenghao Bi2, Georges Adam2

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|September 22, 2020
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A novel magnetic microrobot system enables controlled movement within biological environments for potential drug delivery. This untethered system demonstrated safe navigation and payload release in preclinical models.

Keywords:
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Area of Science:

  • Biomedical Engineering
  • Robotics
  • Materials Science

Background:

  • Microrobots offer potential for minimally invasive biomedical applications.
  • Precise control and real-time imaging are crucial for in vivo microrobot navigation.
  • Biocompatibility and payload delivery efficiency are key considerations for clinical translation.

Purpose of the Study:

  • To develop and characterize an untethered magnetic microrobot system for biomedical applications.
  • To evaluate the microrobot's navigation capabilities in complex biological environments.
  • To assess the system's biocompatibility and drug delivery potential.

Main Methods:

  • Development of a tumbling magnetic microrobot actuated by a rotating permanent magnet.
  • Implementation of a two-degree-of-freedom magnet control for 2D steering.
  • Utilizing high-frequency ultrasound for real-time microrobot tracking.
  • Conducting in vitro, ex vivo, and in vivo experiments in colonic models.
  • Performing payload release studies and cytotoxicity assessments.

Main Results:

  • The microrobot demonstrated end-over-end tumbling motion for net forward propulsion.
  • Two-dimensional directional control was achieved, enabling steering along various trajectories.
  • Successful navigation was shown in murine and porcine colon models under different conditions.
  • Ultrasound imaging provided real-time position monitoring, even with optical occlusion.
  • The microrobot released a fluorescein payload and exhibited no significant cytotoxicity.

Conclusions:

  • The developed magnetic microrobot system is capable of controlled locomotion in biological tissues.
  • The system shows promise for targeted drug delivery and other in vivo biomedical applications.
  • The materials used are biocompatible, supporting the potential for clinical translation.