Patent ID: 6575893
Filing Date: 2003-06-10
Classification: A61N,Y10S

Abstract:
A magnetic field applicator for heating magnetizable materials in biological tissue of the type that includes a magnetic yoke with two pole shoes facing each other separated by a gap to create an exposure volume, and a magnetic coil for the production of a magnetic alternating field associated with each pole shoe, wherein the applicator comprises:a magnetic yoke having two parallel vertical yoke elements spaced a distance from each other and two transverse yoke elements connected between said vertical yoke elements; opposed pole shoes disposed generally in the center of said transverse yoke elements; at least one transverse yoke element being displaceable relative to the other of said transverse yoke elements so that the gap defining the exposure volume may be adjusted; said magnetic yoke being constructed from a plurality of ferrite segments joined together; said magnetic alternating fields having magnetic field forces of about 10 to 15 kA/m and frequencies of about 50 to 100 kHz generated by said applicator; and said magnetic coils are disk coils with at least one winding extending helicoidally, each said magnetic coil surrounding a respective pole shoe to define an intercalated surrounding magnetic coil/pole shoe gap.