Electrode assembly for EEG headset

Details Electrode assembly for EEG headset Electrode assembly for EEG headset

1993-04-28

1994-10-25

Cohen, Lee S.

Surgery

Truss

Pad

607153, 128731, A61B 50478

Patent

active

053579577

ABSTRACT:
An electrode assembly for an EEG headset has a cylinder and piston, at least one disk-shaped mounting element with an inner portion for mounting the cylinder therethrough and an outer portion overlapping onto the liner of the headset, an electrode body made of insulative material mounted to the piston and holding an electrode tip, and an electrode tip made of conductive material with a wire lead for transmitting electrical signals from the tip to an external signal processing unit separately from the rest of the electrode assembly. Preferably, the mounting element is a pair of rubber washers supporting the cylinder from each side of the liner. The electrode body has a threaded end for threading in the piston, and a central passage for supplying electrolyte gel to the electrode tip. The electrode tip has a disk shape with a relatively large surface area for maintaining good contact with the subject's scalp. The electrode body may also have a ball joint between its piston-mounting portion and tip-holding portion. Other types of electrode tips may be mounted on the assemblies. The headset and electrode structures provide a shorter signal transmission system, which greatly reduces extraneous noise, and allow for direct connection to an external recording or EEG device. The headset may include signal conditioning hardware in the form of a VLSI digital amplifier/signal conditioning unit that can output analog, digital, or telephonic modulated EEG signals, or an FM telemetry system mounted on the headset for wireless transmission.

REFERENCES:
patent: 4632122 (1986-12-01), Johansson et al.
patent: 4683892 (1987-08-01), Johansson et al.
patent: 4800888 (1989-01-01), Itil et al.
Ary et al., "A Method for Locating Scalp Electrodes", IEEE Transactions on Biomedical Eng. vol. BME-28 #12 Dec. '81.

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