Liquid Sample Test Strip Slot for Complete Wetting
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Solution Overview
Problem
Existing drug testing devices face issues such as complexity, inefficiency, environmental pollution, and sample adulteration, particularly in situations where urine samples cannot be collected, leading to unreliable test results.
Innovation Solution
A test device with a liquid retaining structure that ensures complete absorption of the sample by a test strip through rapid insertion and withdrawal, utilizing surface tension to retain liquid in an open slot or flow channel, ensuring sufficient liquid for the test.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the test device is rapidly inserted and withdrawn from the liquid sample, then the operation speed is improved and test time is reduced, but the liquid sample may not fully wet the test strip due to sample loss
Solution Approach 1:
The liquid retaining structure is pre-configured in the slot before the test is performed. When the device is rapidly inserted and withdrawn, this pre-configured structure automatically retains the liquid sample, ensuring sufficient liquid remains to wet the test strip despite the rapid operation. The structure is prepared in advance to compensate for potential sample loss during fast insertion/withdrawal.
Solution Approach 2:
The liquid retaining structure acts as an intermediary between the liquid sample and the test strip. It temporarily holds and manages the liquid sample, ensuring controlled delivery to the test strip. This intermediary structure prevents direct loss of liquid during rapid insertion/withdrawal while still allowing the test strip to be adequately wetted.
2Reliability
If conventional testing devices are used, then they can perform basic testing functions, but they are complicated in design and manufacture requiring expensive materials
Solution Approach 1:
The test device employs a disposable design where the entire device including the liquid retaining structure and test strip is intended for single use and then discarded. This eliminates the need for complex, expensive, reusable components that require maintenance and sterilization. The disposable nature allows simplification of the design while maintaining reliable testing function for each use.
Solution Approach 2:
The device integrates multiple functions into a single unified structure. The slot serves both as a holder for the test strip and as a liquid retaining structure. The covering layer both protects the test strip and forms part of the liquid retention mechanism. This multi-functionality reduces the number of separate components needed, simplifying design and manufacture.
3Quantity of substance
If the test device uses a covering layer to form a sealed channel, then liquid retention is improved, but the device structure becomes more complex
Solution Approach 1:
The covering layer is merged with the slot structure to form an integrated liquid retention system. The covering layer is applied directly over the slot, combining the structural support function of the slot with the sealing function of the covering layer. This merging creates the sealed channel for liquid retention without requiring separate, complex components for each function.
Solution Approach 2:
The covering layer is implemented as a thin film that conforms to the slot structure. This thin film approach provides effective sealing for liquid retention while adding minimal structural complexity. The flexible nature of the thin film allowing it to adapt to the slot geometry simplifies the overall structure compared to rigid, pre-formed sealed chambers.
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 device provides rapid and reliable test results by ensuring adequate liquid contact with the test strip, preventing incomplete wetting and sample loss, and simplifying the operation process.
Implementation Method 1
utilizing surface tension to retain liquid in an open slot or flow channel, ensuring sufficient liquid for the test
Implementation Method 2
a part of the liquid is in contact with a test strip inside the slot, and the other part of the liquid enters the liquid retaining structure; once the test device is withdrawn from the liquid sample, the liquid within the liquid retaining structure can continue to be supplied to the test strip for absorption
Data Source
AI summary
Provided in the present application is a test device, including a base layer. The base layer is provided with a slot for accommodating a testing element. The base layer further includes a structure for retaining a liquid sample. By means of the test device, an analyte in the liquid sample can be tested quickly, efficiently, and accurately, and an operator can use the test device more conveniently and freely without causing incorrect test results.