Derived MRI induced Maximum Torque (ASTM F2213) from measured MRI induced Maximum Force (per ASTM F2052)
Richard Williamson 1 , Michael Childers 1 , Tushar Dharampal 1 , Shiloh Sison 1 , Amber Durica 1 , Gabriel Mouchawar 1 , and John Nyenhuis 2
St. Jude Medical, Sylmar, California, United
University, West Lafayette, Indiana, United States
This abstract demonstrates that for some implantable
devices, torque testing per ASTM F2213 as a part of MR
conditional safety assessment, may not be necessary as a
conservative magnetic torque value may be calculated
using the measured magnetically induced force per ASTM
F2052 along with the physical properties of the device.
Two conservative upper-bound equations (Tier 1 and Tier
2) are derived and used to estimate the magnetically
induced torque for four implantable devices.
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