Microfluidic TIRF Chip for Trace-Level Cancer Biomarker Detection
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Solution Overview
Problem
Current cancer detection methods, especially for lethal types like ovarian and pancreatic cancer, are ineffective due to the lack of tumor-specific biomarkers and high detection limits, leading to late-stage diagnosis and low survival rates.
Innovation Solution
Development of a microfluidic chip integrated with total internal reflection fluorescence (TIRF) microscopy and a unique bonding technique for precise capture and detection of single molecules, enabling the detection of tumor-specific nucleocytoplasmic proteins in the circulation at extremely low levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ELISA methods are used for cancer detection, then the detection process is simple and widely applicable, but the detection limit is high and sensitivity is insufficient for early-stage cancer
Solution Approach 1:
The detection system is segmented into distinct functional modules: microfluidic flow channels for sample delivery, TIRF microscopy for single-molecule detection, and digital image analysis for quantification. This segmentation allows each component to be optimized independently, achieving ultra-sensitive detection while maintaining operational simplicity
Solution Approach 2:
Total internal reflection fluorescence microscopy serves as an intermediary technique that bridges conventional ELISA simplicity with single-molecule detection sensitivity. The TIRF method enables detection of individual fluorescently-labeled target molecules without requiring complex signal amplification or processing systems
2Reliability
If tumor-specific biomarkers are used for detection, then cancer-specific detection is achieved, but the concentration of these biomarkers in circulation is extremely low making them undetectable by conventional methods
Solution Approach 1:
The patent replaces conventional bulk detection mechanics with single-molecule imaging physics. By using TIRF microscopy to detect individual fluorescent molecules, the system can identify trace amounts of tumor-specific biomarkers that would be undetectable by ensemble methods, achieving both high specificity and sensitivity for early cancer detection
3Reliability
If early-stage cancer detection is pursued, then survival rate improves significantly, but current methods lack the sensitivity to detect cancer at this stage
Solution Approach 1:
The invention extracts and amplifies the detection signal to the single-molecule level. By using fluorescent labeling and TIRF microscopy, the system extracts individual target molecules from complex biological samples and makes them visible through optical detection, enabling reliable early cancer detection with 100% sensitivity and specificity
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 system achieves 100% sensitivity and specificity in early cancer detection, surpassing conventional ELISA methods by detecting trace levels of tumor-specific proteins, allowing for non-invasive and accurate diagnosis of cancer at its early stages.
Implementation Method 1
total internal reflection fluorescence (TIRF) microscopy
Implementation Method 2
total internal reflection fluorescence (TIRF) microscopy
Implementation Method 3
the capture surface comprises a binding molecule
Data Source
AI summary
Described are chips for detecting a target in a sample including a microfluidic flow chamber comprising one or more flow channels having a capture surface and at least one micromixer. Described are methods of using this chip wherein targets are identified by total internal reflection fluorescence (TIRF).