Biosensor Test Strip Reaction Pool Design
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Solution Overview
Problem
Conventional biosensor test strips face issues with sample retention and measurement precision due to open reaction zones, requiring excessive sample volume and leading to measurement errors and discomfort for users, while prior art devices with capillary flow channels suffer from sample spreading and increased production complexity.
Innovation Solution
A biosensor test strip design featuring a second working electrode that circumferentially surrounds the first working electrode, forming a reaction pool to retain the liquid sample and ensure complete electrochemical reactions, reducing sample volume requirements and enhancing measurement precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an open reaction zone is used, then the device structure is simple, but the liquid sample spreads or loses easily causing measurement errors
Solution Approach 1:
The patent uses a disposable test strip with a reaction pool formed by the second working electrode surrounding the first working electrode. This disposable structure confines the liquid sample within the reaction pool, preventing spreading and loss, thereby maintaining measurement precision without requiring complex reusable components.
2Device complexity
If an open reaction zone is used, then the device structure is simple, but larger quantity of liquid sample is required
Solution Approach 1:
The disposable test strip incorporates a reaction pool defined by the second working electrode that circumferentially surrounds the first working electrode. This structure confines the liquid sample, reducing the volume needed for effective measurement while maintaining simplicity in the overall device structure.
3Ease of operation
If capillary flow channel is used, then liquid sample flow is guided, but the liquid sample spreads sidewardly causing examination error
Solution Approach 1:
The test strip uses a reaction pool structure where the second working electrode surrounds the first working electrode, creating a confined space that prevents sideward spreading of the liquid sample. This simple disposable structure effectively guides and contains the sample without requiring complex flow channels.
4Ease of operation
If flow-terminating interface is added, then liquid sample flow is controlled, but production complexity and cost increase
Solution Approach 1:
The patent employs a reaction pool formed by the second working electrode surrounding the first working electrode, which naturally confines and controls the liquid sample flow without requiring additional flow-terminating interfaces. This maintains production simplicity while achieving effective sample control.
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 design effectively retains the liquid sample within the reaction pool, reducing the amount needed, improving measurement precision, and decreasing production costs while ensuring comfortable and reliable testing.
Implementation Method 1
a flow channel (114) into which a liquid sample is drawn therein and flows therethrough by means of capillary attraction
Data Source
AI summary
A biosensor test strip includes: a first working electrode and a second working electrode formed on a base plate, having the second working electrode circumferentially surrounding the first working electrode to define a reaction pool within the second working electrode having a biological reagent provided in the reaction pool. Upon feeding a liquid sample of a user or patient into the reaction pool, the liquid sample will be well retained in the reaction pool to be reacted with the reagent to produce a signal which is then converted to be a readable data as displayed on a measurement apparatus or meter.