生体計測時に混入する静電気雑音対策を目的とした 医療用帯電防止靴の開発とその有用性

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The aim of this research was to evaluate the usefulness of anti-electrostatic shoes, developed for the prevention of static electricity in the clothing of medical workers, in medical measurements such as EEG recordings. The shoe was constructed employing a sole with thin conductive rubber and a midsole part made of electro-conductive tape. The shoe sole impedance showed a significant!y lower resistance (5×106Ω), compared with that (8×1012Ω) of conventional shoes. Using these impedances, each time constant showed a decay in the current which discharged into the ground through the shoe sole from the electrified hand of a medical worker, being about 1,700 sec. on wearing conventional shoes, and 1.2 sec. on wearing the anti-electrostatic shoes. The electrostatic noise (288.21±66.15μV)in EEG records induced by the electrified hand movement of medical workers wearing conventional shoes with a distance of 5cm from the EEG electrode lead box, showed a signiflcantly higher voltage in comparison to the noise (17.57±3.47μV) on wearing the anti-electrostatic shoes. These results suggest that wearing anti-electrostatic shoes was useful for the elimination of electrostatic noise in the recording data, when biomedical measurements such as EEG and ECG were performed by medical workers.
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