Patent ID: 6635009
Filing Date: 2003-10-21
Classification: A61N,H01F,Y10S

Abstract:
A magnetic field applicator for heating magnetic substances in biological tissue, said applicator being of the type which comprises a magnetic yoke with two pole shoes facing each other and separated by a prescribed distance to define a magnetic field exposure volume in which the tissue is heated; a pair of magnetic coils for the production of the magnetic field, one of said coils surrounding a respective pole shoe, wherein said applicator comprises:a magnetic yoke having opposing pole shoes; said magnetic yoke including a plurality of ferrite segments assembled together with transitions defined between adjacent segments for an even flow of energy through said magnetic yoke; a magnetic disk-shaped coil surrounding each said pole shoe; and an intermediate air gap defined between said disk-shaped coils and said pole shoes for removing excess heat and lowering energy flow densities on the surrounding edges of the pole shoes to prevent magnetic field losses providing a more efficient treatment of tissue.