title: Method to rotate an endovascular device around the axis of a vessel using an external magnetic field.
abstract: 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 A m2, 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.
authors.affiliation: Toshiba Stroke Research Center, University at Buffalo (SUNY), Buffalo, New York 14214, USA.
authors.forename: E
authors.initials: E
authors.lastname: Florin
authors.forename: H S
authors.initials: HS
authors.lastname: Rangwala
authors.forename: S
authors.initials: S
authors.lastname: Rudin
mesh_terms: D001807:Blood Vessel Prosthesis; D002404:Catheterization / Q000295:instrumentation* / Q000379:methods*; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008280:Magnetics / Q000295:instrumentation* / Q000627:therapeutic use*; D019919:Prosthesis Implantation / Q000379:methods*