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Magnetic Soft Helical Manipulators with Local Dipole Interactions for Flexibility and Forces.

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Area of Science:

  • Robotics
  • Materials Science
  • Biomedical Engineering

Background:

  • Magnetic continuum manipulators (MCMs) are remotely actuated robots used in confined spaces.
  • Existing MCM designs face a trade-off between magnetic moment and flexibility, limiting their application in complex environments like medical procedures.
  • Flexible magnetic structures are crucial for navigating tortuous paths in medical applications.

Purpose of the Study:

  • To propose a new MCM design framework that overcomes the limitations of existing cylindrical designs.
  • To enable increased diameter in MCMs without sacrificing flexibility or magnetic moment.
  • To improve the maneuverability and applicability of MCMs in confined medical workspaces.

Main Methods:

  • Developed a novel MCM design framework utilizing magnetic soft composite helices as bending regions.
  • Incorporated permanent ring magnets separated by specific spacing to leverage local dipole interactions.
  • Investigated the impact of local dipole interactions on bending stiffness and angular deflection.
  • Fabricated and tested a multisegment MCM in an abdominal aorta phantom.

Main Results:

  • The proposed design allows for increased diameter without compromising flexibility and magnetic moment.
  • Local dipole interactions between permanent magnets reduced bending stiffness, increasing angular deflection by 31% compared to designs without these interactions.
  • Demonstrated successful fabrication and maneuverability of a multisegment MCM.

Conclusions:

  • The new MCM design framework offers enhanced performance for navigating complex paths.
  • The design shows significant potential for medical applications, including procedures within the abdominal aorta.
  • This advancement facilitates the use of MCMs for tasks such as passing guidewires and contrast dye.