EEG Sensor Comb
Original Publication Date: 2001-Jul-23
Included in the Prior Art Database: 2001-Jul-23
Di-An Hong: AUTHOR [+4]
EEG Sensor Comb
EEG Sensor Comb
Di-An Hong, Tom Mathew, Yong Liu, and Swee Mok
Electroencephalogram (EEG) signals are used to measure the electrical activity of the brain. EEG signals are typically recorded using gold or silver disc electrodes that must be used with electrode gel or paste to apply to the scalp. Using disc electrodes, the correct amount of gel to be used must be measured and applied to the electrode, the hair must be parted, the exposed scalp must be moistened, the electrode is applied to the scalp, and finally the electrode must be secured to the scalp to ensure good measurements. Different types of electrodes were investigated to improve on eliminating the use of electrode gel or paste, quicker application of the electrode to the scalp, and ease of use.
Electrode gel or paste leaves a sticky residue in the hair when the electrode is removed, which is difficult to clean out. It is also time consuming to measure out the correct amount of gel to be used, apply the gel to the electrode, part the hair, and then apply the electrode to the scalp and ensure good contact. These steps would then have to be repeated if more electrodes had to be applied. When the electrode gel dries out, the electrode would have to be removed and the process repeated. Other accessories also have to be used to secure the electrode to the scalp. The Sensor Comb addresses these issues in a cost effective manner. It is an EEG sensor solution that can be applied quickly without electrode gel or paste.
The EEG Sensor Comb is a flexible EEG sensor that uses thin comb-like teeth to easily contact the scalp (Figure 1).
Figure 1. EEG Sensor Comb
It does not use electrode paste or gel and can be quickly and easily applied to the scalp. The design utilizes the comb-like structure with multiple thin teeth to part the hair; thus allowing good contact to be made between the scalp and the silver electrodes. The sensor is flexible which allows it to conform to the shape of the scalp to ensure the best possible contact. The structure also allows the sensor to be placed on the scalp without other accessories (Figure 2).
Figure 2. Sensor on scalp
At the ends of the teeth are silver electrodes that are used to detect the EEG signal (Figure 3).
Figure 3. Silver Electrodes on Sensor
Moreover, water is dispensed from the ends of these teeth through tiny holes to help moisten the scalp to ensure good electrical contact between the silver electrodes and the scalp for reliable EEG signal detection. The water can be dispensed at anytime with the press of a button on the sensor. The water is held in absorbent material that can be released periodically by the user (Figure 4).
Figure 4. Water dispensing system
This type of sensor would allow for gel free sensor use that is much more user friendly than existing EEG sensors, specifically for those areas of the scalp that have hair. The EEG Sensor Comb allows for quicker, faster, and easier EEG measurements than previous methods.