EEG Sensor Electrode Placement and Adhesion Design
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Solution Overview
Problem
Existing EEG sensors face challenges in ensuring proper electrode placement and maintaining adhesion on the temple and forehead, leading to potential misreporting of physiological characteristics due to improper placement or artifacting.
Innovation Solution
The design of EEG sensors with features such as fixed electrode distances, concave curvatures, and protrusions to facilitate accurate placement and adhesion, including a bridge for stability and narrow tail sections to prevent twisting, along with labels and alignment features for user guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If EEG sensors use simple flat design without special features, then manufacturing is easier and device complexity is lower, but electrode placement accuracy and adhesion reliability deteriorate
Solution Approach 1:
The sensor substrate is designed with a concave curvature that complements the convex surface of the patient's forehead. This curvature ensures that the electrodes maintain consistent contact pressure and proper spacing across the curved surface, improving placement accuracy without requiring complex adjustment mechanisms.
Solution Approach 2:
The sensor incorporates protrusions at specific electrode locations that extend beyond the substrate surface. These localized features ensure precise electrode positioning and maintain consistent skin contact, while the rest of the substrate remains relatively simple for easy manufacturing.
2Strength
If EEG sensors use wide tail sections for cable attachment, then structural strength is improved, but twisting and rotation of the sensor on the patient's head increases
Solution Approach 1:
The tail section is designed with an asymmetric narrow configuration that naturally resists rotational forces. The narrowed shape creates a stabilizing effect that prevents the sensor from twisting on the patient's head, while still providing sufficient strength through strategic material placement and adhesive bonding.
3Ease of operation
If EEG sensors lack alignment features and labels, then device complexity is reduced, but ease of proper placement by users deteriorates
Solution Approach 1:
The sensor incorporates visually distinct labels and alignment features with different colors or patterns that guide users during placement. These visual cues make it easy to identify electrode positions and proper orientation, while the labels are integrated into the substrate design for minimal additional complexity.
4Measurement precision
If EEG sensors are placed without precise positioning features, then ease of application is improved, but measurement precision and signal quality deteriorate
Solution Approach 1:
The sensor substrate is pre-shaped with the exact curvature needed for proper forehead placement, and electrodes are pre-positioned with precise spacing. This preliminary preparation ensures that when the sensor is applied, the electrodes are automatically positioned at the correct locations for accurate EEG measurement, eliminating the need for complex positioning adjustments during application.
Data Source
AI summary
Embodiments of the present disclosure relate to sensor designs or shapes configured to facilitate placement of sensor electrodes and, thus, proper positioning of the sensors on patients. According to certain embodiments, a sensor may include a substrate that includes multiple electrodes, where a first electrode is configured to be placed on a patient's temple and a second electrode is configured to be placed on a patient's forehead directly above a patient's eyebrow. The sensor may include a particular shape and a fixed distance between the first and second electrodes to facilitate proper angling and positioning of the first and second electrodes as well as the other electrodes (e.g., third and fourth electrodes). Other embodiments may include a method for positioning the sensor on the patient, including a monitor with help screens.