EEG Electrode Gel Dispensing System for Low Skin Impedance
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Solution Overview
Problem
Existing EEG recording systems face challenges in achieving high signal-to-noise ratio (SNR) quickly, particularly in emergency situations where time is critical and invasive methods are not desirable.
Innovation Solution
A registering system comprising at least one electrode and a dispensing unit that provides a predefined amount of electrolytic gel between the electrode and the skin surface, optimizing the electrode-skin impedance to enhance SNR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional EEG recording methods are used with minimal electrolytic gel, then the procedure is fast and non-invasive, but the signal-to-noise ratio is low due to high skin impedance
Solution Approach 1:
The system performs preliminary skin preparation by automatically dispensing a sufficient amount of electrolytic gel (at least 1.75 ml per cm²) onto the electrode before recording begins. This preliminary action reduces skin impedance and ensures optimal electrical contact, thereby improving signal-to-noise ratio without requiring complex manual preparation procedures during the actual recording.
Solution Approach 2:
The dispensing unit is integrated into the EEG system itself, allowing the system to automatically provide the necessary electrolytic gel without requiring separate manual intervention. The system serves its own preparation needs by incorporating the gel dispensing functionality directly into the recording apparatus, simplifying the overall procedure while ensuring adequate gel application.
2Reliability
If invasive methods like ECoG are used to improve signal quality, then the signal-to-noise ratio increases, but the invasiveness and complexity of the procedure increase
Solution Approach 1:
The system changes the parameter of electrolytic gel quantity from minimal amounts to at least 1.75 ml per cm² of electrode surface area. This parameter change in gel volume significantly reduces skin impedance and improves signal quality, achieving results comparable to invasive methods while maintaining the non-invasive nature of scalp EEG recording.
Solution Approach 2:
The electrolytic gel acts as an intermediary substance between the electrode and the scalp skin. By providing an adequate amount of this conductive medium, the system improves electrical contact and signal quality without requiring direct invasive contact with brain tissue, thus maintaining the advantages of non-invasive EEG while achieving high signal quality.
3Reliability
If skin preparation procedures are performed thoroughly to reduce impedance, then the signal quality improves, but the time required for the procedure increases
Solution Approach 1:
The system automatically performs the skin preparation function through an integrated dispensing unit that applies the required amount of electrolytic gel without requiring manual scrubbing or extensive preparation by the operator. This self-service approach ensures adequate gel application while minimizing the time and effort required for preparation.
Solution Approach 2:
The system changes the approach from manual mechanical preparation to automated chemical preparation by dispensing sufficient electrolytic gel. This parameter change in the preparation method achieves low impedance and high signal quality while significantly reducing the time required compared to traditional manual skin preparation techniques.
4Reliability
If a sufficient amount of electrolytic gel is provided to reduce skin impedance, then the signal-to-noise ratio improves, but the amount of material required increases
Solution Approach 1:
The system establishes a precise parameter for electrolytic gel quantity (at least 1.75 ml per cm² of electrode surface area) that optimizes signal-to-noise ratio. This quantified approach ensures sufficient gel is applied to achieve low impedance and high signal quality, while the specific parameter prevents excessive use beyond what is necessary for optimal performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces skin impedance to less than 10 kΩ, achieving high SNR in a fast and efficient manner, even in situations where time is limited.
Implementation Method 1
The predefined amount of electrolytic gel is of at least 1.75 ml per cm2... The system effectively reduces skin impedance to less than 10 kΩ, achieving high SNR
Data Source
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Figure 3A~5C
Figure 6~8B
AI summary
A registering system comprising at least one electrode, and at least one dispensing unit. The dispensing unit is configured to be placed over the at least one electrode and provide a predefined amount of electrolytic gel between the at least one electrode and the skin surface of the user. The registering system is characterised in that the predefined amount of electrolytic gel is of at least 1.75 ml per cm2 of surface of electrode in contact with the skin through said electrolytic gel, more preferably at least 2.3 ml per cm2 of surface of electrode in contact with the skin through said electrolytic gel.