Microfluidic Flow Analyzer for HIV Screening
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Solution Overview
Problem
Conventional flow cytometers for HIV diagnosis are costly, cumbersome, and require specialized equipment and personnel, making them unsuitable for widespread, cost-effective pathological detection, particularly in resource-limited settings.
Innovation Solution
A microfluidic flow analyzer with a configuration of buffer and sample channels, coupled with fibre-coupled laser sources and detectors, allows for orthogonal excitation and detection of optical signals from cells flowing through a central channel, enabling efficient pathological detection with reduced infrastructure costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional flow cytometers are used for HIV diagnosis, then measurement precision of CD4 cell count is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex mechanical flow cytometry systems with an optical-based microfluidic system. Instead of using bulky mechanical flow cytometers with multiple mechanical components, the invention uses optical excitation through laser sources and optical detection through photodetectors to measure CD4 cell counts, thereby reducing device complexity while maintaining measurement precision
Solution Approach 2:
The patent transitions from conventional two-dimensional flow cytometry to a three-dimensional optical detection system. By implementing optical excitation and detection at multiple spatial dimensions within the microfluidic channel, the system achieves accurate cell counting and characterization without requiring complex mechanical scanning systems
2Measurement precision
If conventional flow cytometers are used for HIV diagnosis, then measurement precision is improved, but ease of operation deteriorates due to requiring experienced personnel
Solution Approach 1:
The microfluidic system is designed to be self-regulating with automated flow control and integrated optical detection. The system automatically performs cell counting and analysis without requiring manual intervention or interpretation by experienced personnel, making it easy to operate while maintaining measurement precision
Solution Approach 2:
The system integrates multiple functions including sample introduction, optical excitation, signal detection, and data analysis into a single unified platform. This multi-functional design eliminates the need for specialized operational knowledge required by separate conventional instruments, improving ease of operation
3Reliability
If conventional flow cytometers are used for HIV diagnosis, then reliability of diagnosis is improved, but loss of substance increases due to requiring expensive chemicals
Solution Approach 1:
The patent uses microfluidic hydraulic principles to control sample and reagent flow through the system. By implementing precise flow control through pressure-driven microfluidic channels, the system minimizes reagent consumption while ensuring reliable sample processing and diagnosis, eliminating the need for expensive chemicals required by conventional methods
4Ease of manufacture
If microfluidic flow analyzer is used, then ease of manufacture and portability are improved, but measurement precision may deteriorate
Solution Approach 1:
The patent optimizes key parameters including laser wavelength selection, optical channel geometry, detector positioning angles, and microfluidic channel dimensions to achieve accurate pathological detection. By carefully tuning these parameters, the system maintains measurement precision comparable to conventional instruments while using cost-effective manufacturing approaches
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 microfluidic flow analyzer significantly lowers the cost of HIV screening, is more portable, and provides quantitative information on cell infection levels, making it suitable for widespread use and other applications like cell counting and environmental monitoring.
Implementation Method 1
Each of the plurality of first exciting optical channels is coupled with a first set of fibre coupled laser source to excite cells in the sample solution, flowing through the central flow channel, to produce one or more first optical signals
Implementation Method 2
Each of the plurality of first detectors placed on each of the plurality of first receiving optical channels detects at least one of the one or more first optical signals
Data Source
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AI summary
The present disclosure is related to a microfluidic flow analyzer for pathological detection. The microfluidic flow analyzer comprises plurality of buffer channels, sample channel, central flow channel, plurality of exciting optical channels and plurality of receiving optical channels. The plurality of exciting optical channels and the plurality of receiving optical channels are placed at predetermined angle to the central flow channel. The plurality of exciting optical channels excite cell in the sample solution flowing through the central flow channel. The cell being excited produces one or more optical signals. The one or more optical signals are received by the plurality of receiving optical channels. The microfluidic flow analyzer comprises plurality of detectors placed on each of the plurality of receiving optical channels for detecting one of the one or more optical signals. The detected optical signal is sent to a computing unit for pathological detection.