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US 6,940,379 B2Granted
Magnets with varying magnetization direction and method of making such magnets
AssigneeStereotaxis, Inc.
InventorFrancis M. Creighton
Life of this patent
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AssigneeStereotaxis, Inc.
InventorFrancis M. Creighton
Estimating the term…
A permanent magnet in which the magnetization direction varies with location to optimize or restrict a magnetic field property in a selected direction at a selected point. The magnetic field property may be, for example, the transverse magnetic field, axial magnetic field, axial gradient of the transverse magnetic field, transverse gradient of the transverse magnetic field, axis gradient of the axial magnetic field, transverse gradient of the axial magnetic field, the product of the transverse magnetic field and the transverse gradient of the transverse magnetic field, the product of the transverse magnetic field and the axial gradient of the transverse magnetic field, the product of the axial magnetic field and the transverse gradient of the axial magnetic field, or the product of the axial magnetic field and the axial gradient of the axial magnetic field. The magnet may be formed of one or more segments in which the magnetization direction varies smoothly and continuously, or the magnet may be formed of a plurality of segments in which the magnetization direction is constant. A method of making and using such magnets is also disclosed.
A method of performing a medical procedure using magnet to project a magnetic field into a patient to control a magnetic medical element inside the patient, where the magnet comprises a plurality of permanent magnet segments, the magnetization direction of each permanent magnet segment varying in three dimensions with respect to each segment's assembled location so that the magnetization direction of each permanent magnet segment is in the direction that substantially optimizes the strength of the externally projected magnetic field at a selected point.
A permanent magnet in which the magnetization direction varies with location to optimize the magnetic field at an externally selected point in a selected direction, the magnet comprising a plurality of permanent magnet segments, the magnetization direction of each permanent magnet segment varying in three dimensions with respect to each segment's assembled location so that the magnetization direction of each permanent magnet segment is in the direction that substantially optimizes the magnetic field strength of the externally projecting at the selected point in the selected direction.
A permanent magnet in which the magnetization direction varies with location to optimize a the magnetic field at an externally selected point in a selected direction, the magnet comprising:
Dependencies are inferred from the claim text.