Patent ID: 8062204
Filing Date: 2011-11-22
Classification: A61N,H05B

Abstract:
1. A magnetic field generating device used for a thermotherapy method comprising: a series resonance circuit having a magnetic field generating coil and a resonance condenser, said magnetic field generating coil comprising a disc-shaped coil device comprising a current path extending in a shape of a spiral in substantially a single plan, said current path comprising a hollow cylindrical member of a nonmagnetic material inside which a space is formed and a plurality of conductive wires covered with an insulation material are arranged on a periphery of said hollow cylindrical member, wherein: each conductive wire is arranged in a circumference of a circle in a predetermined diameter seen from a cross-sectional direction of the current path, said conductive wires are provided with a twist along a line of a central axis of the current path, the diameters of said conductive wires range from 0.06 mm to 0.1 mm, the inner diameter of said hollow cylindrical member ranges from 5 mm to 40 mm, a cooling agent is circulated inside said hollow cylindrical member, a core plate of a high permeability material having an outer diameter equal to or larger than an outermost diameter of said disc-shaped coil is arranged on one side of the plane of said disc-shaped coil device, and said magnetic field generating device is used for the thermotherapy method in which a magnetic flux is irradiated from outside to a patient to selectively heat a specific portion of the patient.