Ceramic single-plate capacitor EEG electrode
AssigneeSAM Technology, Inc.
InventorsAlan S. Gevins, David Blau
Life of this patent
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Abstract
A dry electrode, which is a single-plate capacitor, is particularly adapted to be placed on a patient's scalp to detect brain waves in an EEG system. The electrode comprises a metal disk sandwiched between very thin and relatively thicker layers of ceramic. The metal disk is attached to a small disk printed circuit board that carries an amplifier to amplify the brain waves detected by the electrode. The quality of contact of the electrode with the patient is measured by applying a pulse or voltage step through the ground electrode.
Claims15
An electrode adapted to be removably placed on the scalp or skin of a patient to detect the patient's physiological electrical signals, the electrode comprising:
- (a) a conductive plate having an outer face and an inner face;
- (b) an insulative layer of a ceramic dielectric material which has a thickness in the range of 0.1 to 0.5 mm, the insulative layer covering the outer face of the conductive plate and adapted to contact the scalp or skin;
- (c) the insulative layer not being covered by a conductive layer so that the insulative layer is not positioned between two conductive layers as in a capacitor.
An electrode which is a single plate capacitor adapted to be removably placed on the scalp of a patient to detect the patient's brain wave electrical signals, the electrode comprising:
- (a) a conductive metal plate having an outer face;
- (b) an insulative ceramic layer, having a thickness of 0.1 to 0.5 mm, covering the outer face of the plate and adapted to contact the scalp or skin;
- (c) the insulative ceramic layer not being covered by a conductive layer so that the insulative layer is not positioned between two conductive layers as in a capacitor;
- (d) a circuit board, the conductive plate being mounted on the circuit board;
- and
- (e) an amplifier means mounted on the circuit board to amplify the brain wave electrical signals.
An electrode adapted to be removably placed on the scalp or skin of a patient to detect the patient's physiological electrical signals, the electrode comprising:
- (a) a conductive plate having an outer face and an inner face;
- (b) an insulative layer of a ceramic dielectric material which has a thickness in the range of 0.002 and to 0.1 mm, the insulative layer covering the outer face of the conductive plate and adapted to contact the scalp or skin;
- and
- (c) the insulative layer not being covered by a conductive layer so that the insulative layer is not positioned between two conductive layers as in a capacitor.
Dependencies are inferred from the claim text.