Biopotential Electrode with Integrated Abrasion and Flexible Body
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Solution Overview
Problem
Existing electrodes for biopotential signal recording, such as EEG, face challenges with skin preparation methods that result in poor contact quality, discomfort for patients, and the need for frequent re-preparation during long measurements due to manual abrasion methods or passive abrasion mechanisms that are ineffective in minimizing movement artifacts.
Innovation Solution
An electrode design with integrated abrasion elements that form a structure with the electrode pad, allowing the sponge element to prevent abrasion during signal measurement and enabling mechanical contact only when the pad is pushed against the skin, combined with a flexible electrode body for intentional movement, which reduces skin irritation and maintains contact quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual skin abrasion is performed before attaching electrodes, then contact quality is improved, but the procedure requires repeated removal and reattachment and cannot be refreshed during long measurements
Solution Approach 1:
The electrode incorporates an abrasive pad that performs skin preparation in advance and maintains its effect throughout the measurement period. The abrasive elements are pre-positioned on the electrode pad, allowing continuous skin interaction without requiring repeated manual intervention or electrode removal.
Solution Approach 2:
The electrode performs its own skin preparation function through the integrated abrasive pad that actively interacts with the skin during measurement. The system is self-sufficient, requiring no external tools or repeated manual abrasion, and automatically maintains contact quality throughout the recording session.
2Device complexity
If passive skin abrasion is used based on electrode movement, then the solution is simple, but it is ineffective for EEG monitoring where patient movements are minimal
Solution Approach 1:
The electrode body is made flexible to enable intentional movement of the electrode pad relative to the adhesive element and skin. This dynamic design allows the operator to actively engage the abrasive elements with the skin during application and refreshing, rather than relying on passive movement from patient motion.
Solution Approach 2:
The flexible electrode body acts as an intermediary that transmits operator intent to the electrode pad, enabling controlled movement and pressure application. This allows the operator to manually activate the abrasion function when needed, bridging the gap between simple design and effective skin preparation.
3Reliability
If continuous skin abrasion is performed during measurement, then contact quality is maintained, but the abrasive pad irritates the skin during long recordings
Solution Approach 1:
The abrasive elements are designed to interact with the skin periodically rather than continuously. The sponge element controls the timing and intensity of abrasion, allowing the abrasive elements to engage with the skin only when needed for initial preparation or refreshing, then disengage during normal measurement to prevent irritation.
Solution Approach 2:
The electrode structure provides different functional zones: the sponge element provides cushioning and gel distribution in the resting state, while the abrasive elements are positioned to engage only when intentional pressure is applied. This spatial differentiation allows abrasion to occur locally and temporarily without continuous skin contact that would cause irritation.
4Reliability
If non-conductive flexible tines are used to penetrate skin layers, then good contact is provided throughout long recordings, but the electrodes feel uncomfortable to the patient
Solution Approach 1:
The electrode combines multiple materials with different properties: conductive elements for signal acquisition, sponge material for cushioning and gel delivery, and abrasive elements for skin preparation. This composite structure achieves both reliable electrical contact and patient comfort by distributing functions across different material components rather than relying on a single invasive element.
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 solution provides a comfortable and reliable electrode for long-term biopotential measurements, minimizing motion artifacts and maintaining effective skin contact without the need for frequent re-preparation, thus enhancing the practicality and comfort for patients.
Implementation Method 1
the sponge element prevents the abrasion elements from touching the skin when biopotential signals are measured
Implementation Method 2
a sponge element, soaked with conductive gel
Data Source
AI summary
An electrode for obtaining a biopotential signal from the skin of a subject. The electrode comprises an adhesive element, an electrode body, an electrically conductive electrode pad, a sponge element, soaked with conductive gel, and means for skin abrasion. The means for skin abrasion comprises abrasion elements forming an integrated structure with the electrode pad, the abrasion elements being so dimensioned that the sponge element prevents the abrasion elements from touching the skin when biopotential signals are measured and enables mechanical contact between the skin and the abrasion elements when the electrode pad is pushed towards the skin. The electrode body is made flexible to enable intentional movement of the electrode pad relative to the adhesive element.