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Related Concept Videos

Magnetic Field Of A Current Loop01:16

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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process,...
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In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
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In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
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Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...
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Magnetic Continuum Robot with Intraoperative Magnetic Moment Programming.

Yanfei Cao1, Zhengxin Yang1,2, Bo Hao1

  • 1Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong, China.

Soft Robotics
|July 5, 2023
PubMed
Summary

This study introduces a novel magnetic moment intraoperatively programmable continuum robot (MMPCR) for enhanced medical applications. The MMPCR offers superior dexterity in shape deformation, overcoming limitations of current magnetic continuum robots (MCRs).

Keywords:
continuum robotmagnetic actuationmagnetic moment programmingsoft robot

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Area of Science:

  • Robotics
  • Medical Devices
  • Magnetic Actuation

Background:

  • Magnetic continuum robots (MCRs) are valuable in medicine due to their miniaturization and lack of complex transmission structures.
  • Current MCRs struggle with simultaneous control of deflection and curvature, leading to limited dexterity and potential collisions.
  • This limitation hinders their use in delicate medical procedures and accessing difficult anatomical regions.

Purpose of the Study:

  • To introduce a novel magnetic moment intraoperatively programmable continuum robot (MMPCR).
  • To enable precise control over the deformation shapes, including deflection directions and curvatures, of MCR segments.
  • To enhance the navigation capabilities and safety of MCRs in medical applications.

Main Methods:

  • Development of a magnetic moment programming method for intraoperative control.
  • Modeling and numerical simulation of the MMPCR's magnetic moment programming and kinematics.
  • Experimental validation of the proposed MMPCR design and control strategy.

Main Results:

  • The MMPCR demonstrated the ability to deform into J, C, and S shapes with desired deflection and curvature modulation.
  • Experimental results showed a mean deflection angle error of only 3.3°, closely matching simulation outcomes.
  • Comparisons confirmed the MMPCR's significantly higher capacity for dexterous deformation compared to conventional MCRs.

Conclusions:

  • The novel MMPCR design and programming method significantly improve MCR dexterity and control.
  • The MMPCR overcomes the limitations of fixed magnetic moment profiles in traditional MCRs.
  • This advancement holds promise for safer and more effective minimally invasive medical procedures.