Assay Device Self-Verification Features
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Solution Overview
Problem
Existing assay devices face challenges in verifying proper functioning, alignment, and calibration, particularly in emergency settings, where rapid and reliable results are crucial, and there is a need for improved methods to ensure accurate and efficient operation.
Innovation Solution
The assay device incorporates integrated functionality verification features, including alignment verification zones and a calibration zone, which allow for detectable changes to confirm correct sample application, alignment, and reaction progression, ensuring accurate results and immediate error detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If assay devices are miniaturized to enable rapid testing in clinical settings, then speed and portability are improved, but reliability of functionality verification deteriorates
Solution Approach 1:
The assay device performs self-verification through integrated control features that automatically detect and report functionality issues without requiring external verification equipment, enabling reliable quality control in miniaturized portable devices
Solution Approach 2:
The device incorporates feedback mechanisms where control features provide real-time information about assay progression and functionality, allowing users to verify correct operation rapidly through visual or electronic signals
2Reliability
If functionality verification features are integrated into the assay device, then reliability is improved, but device complexity increases
Solution Approach 1:
Multiple verification functions (control features, alignment verification, calibration) are merged into the single assay device structure, integrating reliability mechanisms without requiring separate verification equipment
Solution Approach 2:
The control features serve multiple purposes: monitoring assay progression, verifying functionality, providing alignment reference, and enabling calibration, thereby reducing overall device complexity through multi-functional integration
3Measurement precision
If alignment verification zones are added to ensure proper positioning, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Alignment verification zones utilize detectable signal changes (such as color changes or fluorescence) to indicate proper positioning, providing precise alignment feedback through simple visual or optical detection mechanisms
4Speed
If rapid results are prioritized in emergency settings, then speed is improved, but reliability of error detection deteriorates
Solution Approach 1:
Control features are pre-positioned within the assay device to enable immediate functionality verification upon sample application, allowing rapid error detection before final results are generated
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 enables rapid verification of assay device functionality and alignment, preventing faulty results and saving time by alerting users to errors, ensuring reliable and accurate diagnostic outcomes in clinical and emergency settings.
Implementation Method 1
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Data Source
AI summary
An assay device for performing an assay on a liquid sample using a detection conjugate capable of binding to an antigen and containing a label. The device includes a substrate surface having a sample addition zone, a reaction zone and an absorbing zone, the zones being connected by at least one fluid passage, wherein the device has a first functionality verifying feature located between the sample addition zone and the reaction zone, and a second functionality verifying feature located within the absorbing zone. Both functionality verifying features are capable of undergoing a detectable change when contacted by the sample, in which the assay device further includes at least one alignment verification zone. There is further provided a kit of parts and a method of conducting an assay.