Coil Device and Magnetic Field Generating Device
First Claim
1. A bread-shaped coil device comprising a current path extending in the shape of a spiral in a substantially same plane, 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 on the peripheries thereof which are arranged on the periphery of said hollow cylindrical member, each conductive wire being arranged in the circumference of a circle in a predetermined diameter seen from the cross-sectional direction of the current path.
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Accused Products
Abstract
Problems to be solved: to provide a coil device and a magnetic field generating device with reduced energy loss that are suitable for use in the thermotherapy method.
Means for solving the problem: a coil device according to the present invention can be used in a magnetic field generating device for the thermotherapy method in which a magnetic flux is irradiated to the patient to selectively heat a specific portion of the patient. Said coil device is a bread-shaped coil device having a current path extending in the shape of a spiral in a substantially same plane, said current path comprising a hollow cylindrical member (10) of a nonmagnetic material inside which a space is formed and a plurality of conductive wires (11, 12) covered with an insulation material on the peripheries thereof. In the present invention, the current path comprising a plurality of conductive wires covered with an insulation material which are arranged in a circle, energy loss caused by the skin effect and energy loss caused by the line capacity can be reduced, making it possible to generate a strong magnetic field. Also, by using the hollow cylindrical member (10), it is possible to easily configure a current path in a predetermined diameter and to inhibit increase in temperature of the coil (3) to avoid fluctuation of the resonance frequency of the resonance circuit. With this, a magnetic field generating device that is suitable for use in thermotherapy, particularly cancer therapy, can be realized.
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Citations
14 Claims
- 1. A bread-shaped coil device comprising a current path extending in the shape of a spiral in a substantially same plane, 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 on the peripheries thereof which are arranged on the periphery of said hollow cylindrical member, each conductive wire being arranged in the circumference of a circle in a predetermined diameter seen from the cross-sectional direction of the current path.
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9. A bread-shaped coil device comprising a current path extending in the shape of a spiral in a substantially same plane, 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 on the peripheries thereof which are arranged inside said hollow cylindrical member, wherein a cooling agent is circulated inside said hollow cylindrical member.
- 10. A magnetic field generating device used for the thermotherapy method comprising a series resonance circuit having a magnetic field generating coil and a resonance condenser, said magnetic field generating coil comprising a bread-shaped coil device having a current path extending in the shape of a spiral in the coil plane, said bread-shaped coil device comprising a hollow cylindrical member of a nonmagnetic material and a plurality of conductive wires covered with an insulation material on the peripheries thereof which are arranged on the periphery of said hollow cylindrical member, each conductive wire being arranged in the circumference of a circle in a predetermined diameter, seen from the cross-sectional direction of the current path.
Specification