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[Development of Magnetic Stimulator].
Brain and Nerve = Shinkei Kenkyū No Shinpo 2017 March
Transcranial magnetic stimulation (TMS) has been used in research into brain function. Recently, TMS has also become an option in treating brain dysfunction. The equipment consists of a coil and a driving circuit. The most widely used coil is a figure-8 coil because of its good resolution, and the most widely used circuit generates a biphasic pulse for repetitive stimulation. To assess the induced electric field distribution in the brain, we conducted simulations using a coil and constructed a brain model from a MR image. Finally, we introduce the coils we have developed for treatment in the home. These include an eccentric figure-8 coil and a dome-shaped coil. Reducing the size of the equipment is one of the chief technical challenges of using rTMS therapeutically in the home. An eccentric figure-8 coil can be driven with a lower current than a conventional figure-8 coil because of its good efficiency, which results in a smaller driving circuit. Conventional figure-8 coils stimulate a highly localized area, therefore making it difficult to ensure that a particular area receives stimulation without the assistance of an infrared camera support system, which is large and expensive. A dome-shaped coil is capable of stimulating a larger area and is robust against errors of positioning caused by the simple navigation system used in the home.
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