The Spiral Electrode for EEG Recording

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  • 頭皮上脳波用らせん針電極
  • アタマ ヒ ジョウ ノウハヨウ ラセン ハリデンキョク

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This paper is to describe a new type of electrode with spiral needle and its examination. This newly modeled electrode (invented by K. Kitahama) is composed of a spiral needle, a resinous holder and a leading wire.<BR>The needle is made of either white gold or stainless steel and is coiled 3 to 4 turns, with the diameter of 2 mm. The needle is coated with thin layer of insulating material except its end part of 1.5 mm length.<BR>In order to apply the electrode to the head skin, hold it between the thumb and index fingers, attach the point vertically to the head-surface, and turn it 180° by degree. Thus, it will be securely applied onto the surface.<BR>The advantages of the spiral needle electrode are as follows : (1) It is hardly dropped off by violent movement of the subject. (2) As it does not look like a needle, the subject becomes hardly tense or frightened. (3) It is easy to attach. (4) It does not make the subject uncomfortable even when applied for a long period of time. (5) The resistance value (D. C.) between electrodes is 20 to 30 kΩ. (6) Artifacts caused by the contact of the perspiring scalp and the electrodes are rarely found.<BR>Thus, we found that the use of the spiral needl electrode is particularly advantageous in such cases as nervous subjects, restless children, hairy women, subjects with disturbed consciousness, patients for brain surgery, application of various activation methods, multiple factor EEG, group administration of EEG--so called Mass EEG (Wada), and recordings in the busy EEG testing room.

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