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Method to rotate an endovascular device around the axis of a vessel using an external magnetic field
Author(s) -
Florin E.,
Rangwala H. S.,
Rudin S.
Publication year - 2007
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2404641
Subject(s) - electromagnet , magnet , magnetic field , stent , magnetic moment , electromagnetic coil , materials science , demagnetizing field , nuclear magnetic resonance , physics , magnetization , mechanical engineering , radiology , medicine , condensed matter physics , engineering , quantum mechanics
A magnetic guidance methodology to rotate a device around the catheter axis is proposed. The specific medical application is to intracranial aneurysms. An endovascular device, the asymmetric stent, has a low porosity region that is rotated to cover the aneurysm neck so as to reduce the blood flow into and hence obliterate the aneurysm. The magnetic guidance system consists of a magnetic device attached to the asymmetric stent and an external homogeneous magnetic field of 0.1 T . This magnetic field puts a torque on the magnetic moment of the magnetic device, thereby rotating the stent for proper orientation. For the magnetic device with the required magnetic moment of 0.001 Am 2 , a cylindrical neodymium permanent magnet is proposed due to its favorable material characteristics while a coil electromagnet with iron core appears impractical due to demagnetizing effects.