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Bioinspired Soft Microrobots with Precise Magneto-Collective Control for Microvascular Thrombolysis.

Meihua Xie1, Wei Zhang2, Chengying Fan2

  • 1Translational Medical Center for Stem Cell Therapy and Institute for Regenerative Medicine, Shanghai East Hospital, Tongji University School of Medicine, Collaborative Innovation Center for Brain Science, Tongji University, 1800 Yuntai Road, Shanghai, 200123, China.

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Summary
This summary is machine-generated.

This study introduces biomimetic magnetic microrobots (BMMs) inspired by magnetotactic bacteria for targeted thrombolysis. These microrobots offer speedy motion and precise control for ultra-minimal invasive drug delivery.

Keywords:
collective behaviormagnetic fieldsmagnetotactic bacteriasoft microrobotsthrombolysis

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Robotics

Background:

  • Soft microrobots require biocompatible interfaces, intelligent functions, and collective locomotion for complex biological environments.
  • Magnetotactic bacteria (MTB) exhibit efficient collective motion and precise positioning, serving as inspiration for microrobot design.

Purpose of the Study:

  • To develop a biomimetic magnetic microrobot (BMM) inspired by MTB for targeted thrombolysis.
  • To achieve speedy motion response and accurate positioning control in microrobots for biomedical applications.

Main Methods:

  • Constructed BMMs with aligned iron oxide nanoparticle (MNP) chains within a microgel shell, mimicking MTB magnetosomes.
  • Utilized interparticle dipolar interactions under static magnetic fields for linear chain assembly.
  • Investigated microrobot speed, positioning accuracy, and locomotion control under rotating magnetic fields.

Main Results:

  • Achieved maximum speed of 161.7 µm s-1 with <4% deviation in positioning under rotating magnetic fields.
  • Demonstrated frequency-dependent synchronization of BMMs at 8 Hz, with asynchronization at higher frequencies due to drag torque.
  • Confirmed BMMs' capability for magneto-collective drug delivery and release for thrombolysis.

Conclusions:

  • The developed BMMs show promise for ultra-minimal invasive thrombolysis through targeted drug delivery.
  • Biomimetic design inspired by MTB enhances microrobot performance for biomedical applications.
  • Collective control and precise locomotion are key for effective microrobot function in vivo.