Magnetic powders for use in hyperthermic treatments - e.g. of tumours, heated by hysteresis in alternating magnetic field

摘要

Magnetic powders (A) of particle size about 1 micron and contg. ions which are not toxic when introduced into the blood stream, are used in hyperthermic medical treatments. (A) are Fe203; Fe304; (Ni)1-x.(Zn)x.Fe204 (x is 0-0.8); (Ni)1-x-u.(Co)u.(Zn)x.Fe204(u is not defined) or (Mn)1-y.(Zn)y.Fe204 (y is 0-07). Pref. (A) has a Curie point close to the temp. at which necrosis of tissue occurs, and is esp. (Mn)0.33.(Zn)0.67.Fe204 (A'). Device for hyperthermic treatment comprises an arrangement for generating a low frequency, alternating magnetic field between the pole pieces of which the part of the body being treated can be placed. The body temp. is controlled by a sensor and a regulating system which controls the low frequency current used to generate the magnetic field. Method is esp. useful for treating tumours by selectively heating them to 41-43 deg.C. The method allows precise location and automatic regulation of the (hysteritic) heating effect.