Biosensor Strip Electrode Segmentation for Accuracy
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Solution Overview
Problem
Conventional biosensors face accuracy issues due to the formation of electric double layers on working electrodes and reference electrodes before specimen measurement, which affects the reliability of specimen measurement.
Innovation Solution
The proposed electrode structure of the biosensor strip includes separate strip recognition and specimen recognition electrodes that operate independently of the working and reference electrodes, preventing the formation of electric double layers and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the working electrode and working reference electrode are used to recognize specimen contact, then the biosensor can identify specimen presence, but electric double layers form on the electrode surfaces degrading measurement accuracy
Solution Approach 1:
The patent divides the electrode system into two independent functional groups: recognition electrodes (strip recognition electrode and specimen recognition electrode) for detecting specimen presence, and working electrodes (working electrode and working reference electrode) for measurement. This segmentation allows the recognition electrodes to be used solely for detection without forming electric double layers that would interfere with measurement accuracy.
Solution Approach 2:
The patent introduces recognition electrodes as intermediary components that mediate between the specimen and the measurement system. These recognition electrodes serve as a buffer layer that detects specimen contact without directly participating in the electrochemical measurement process, thereby preventing harmful electric double layer formation on the working electrodes.
2Measurement precision
If separate recognition electrodes are added to prevent electric double layer formation, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent merges the reference function into the working electrode structure by providing a working reference electrode that shares the same physical location and structural framework as the working electrode. This merging approach allows the system to achieve separate functional operations (recognition and measurement) while minimizing physical complexity through shared structural elements.
Solution Approach 2:
The recognition electrodes are designed with multi-functionality, serving both as specimen contact indicators and as part of the overall electrode assembly structure. The working reference electrode also serves dual purposes by providing reference potential for measurement while being integrated into the same physical structure as the working electrode, thereby reducing overall device complexity.
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
This solution enhances specimen measurement accuracy by preventing the formation of electric double layers on the working and reference electrodes, thereby improving the reliability of the measurement process.
Implementation Method 1
The electric double layer appears when an electric field is applied to a boundary between different materials (electrodes, specimens, or solutions), and electric double layer capacitance (DLC) that is a capacitance of the electric double layer may be included in a response current signal for the specimen to be measured
Implementation Method 2
accumulating the specimen in the specimen insertion passage by using capillary phenomenon that is made possible through plasma or chemical surfactant treatment process
Data Source
Figure 1
Figure 2(a)~2(b)
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AI summary
Disclosed are a biosensor strip for measuring a specimen, an electrode structure thereof, and a specimen measurement method using the same. An electrode structure of a biosensor strip according to one embodiment may comprise: a strip recognition electrode used to recognize that the biosensor strip is inserted into a specimen measurement device; a specimen recognition electrode used to recognize a specimen; and a working electrode and a working reference electrode used to measure the specimen.