Abstract:Magnetic stimulation using implantable devices may offer a promising alternative to other stimulation methods such as transcranial magnetic stimulation (TMS) or electric stimulation using implantable devices. This alternative may increase the selectivity of stimulation compared to TMS, and eliminate the need to expose tissue to metals in the body, as is required in electric stimulation using implantable devices. However, previous studies of magnetic stimulation of the sciatic nerve used large coils, with a dia… Show more
“…Recently, microcoil technology has been a significant development in magnetic stimulation therapy [10][11][12][13][14]. (The term "microcoil" is often used, although these devices do not necessarily have a circular shape like a traditional "coil" but rather sometimes appear to be more like a bent wire.)…”
The purpose of this paper is to calculate the maximum electric field in the brain tissue surrounding a microcoil. The microcoil is represented as a wire coupled capacitively to the surrounding tissue. For a 1 mA, 3 kHz current in the wire, the value of the electric field intensity in the tissue is approximately 4 mV/m. The intensity of the electric field is proportional to the frequency, the capacitance per unit area, and the square of the wire length. The electric field produced by this coil by electromagnetic induction is in the order of 0.002 mV/m. Therefore, the electric field produced by capacitive coupling is much greater than the electric field produced by induction. Methods to distinguish between capacitive and magnetic stimulation are discussed.
“…Recently, microcoil technology has been a significant development in magnetic stimulation therapy [10][11][12][13][14]. (The term "microcoil" is often used, although these devices do not necessarily have a circular shape like a traditional "coil" but rather sometimes appear to be more like a bent wire.)…”
The purpose of this paper is to calculate the maximum electric field in the brain tissue surrounding a microcoil. The microcoil is represented as a wire coupled capacitively to the surrounding tissue. For a 1 mA, 3 kHz current in the wire, the value of the electric field intensity in the tissue is approximately 4 mV/m. The intensity of the electric field is proportional to the frequency, the capacitance per unit area, and the square of the wire length. The electric field produced by this coil by electromagnetic induction is in the order of 0.002 mV/m. Therefore, the electric field produced by capacitive coupling is much greater than the electric field produced by induction. Methods to distinguish between capacitive and magnetic stimulation are discussed.
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