Magnetic guidewire steering at ultrahigh magnetic fields

Area of Science:

• Medical Devices
• Robotics
• Biophysics

Background:

• Magnetically actuated guidewires offer potential for minimally invasive procedures.
• Current magnetic steering is limited to low magnetic fields, hindering integration with ultrahigh field (UHF) systems like MRI scanners.

Purpose of the Study:

• To present a magnetic guidewire design and steering strategy for operation in UHF environments.
• To elucidate the principles of magnetic actuation for permanent magnets at UHF.

Main Methods:

• Modeling the uniaxial magnetization behavior of permanent magnets to define magnetic torque and force.
• Developing a magnetic guidewire using neodymium magnets and a fiber optic rod.
• Testing the guidewire in a 7-Tesla preclinical MRI scanner.

Main Results:

• Demonstrated unique magnetic actuation opportunities at UHF, including in situ remagnetization.
• Successfully illustrated steering principles within a 7-Tesla MRI scanner.
• Established a framework for UHF magnetic actuation.

Conclusions:

• The developed UHF magnetic actuation framework enables next-generation magnetic robots to operate inside MRI scanners.
• This technology advances the potential for magnetic steering in UHF medical environments.