Imaging Flow Cytometry Light Obscuration Detection
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Solution Overview
Problem
Existing optical flow systems lack effective methods for accurately measuring light obscuration in fluid samples, which can be more informative than light scatter for particle analysis.
Innovation Solution
An optical flow imaging system with a properly dimensioned flow cell and a laser fan generator for illuminating particles, combined with a photodiode on the opposite side of the flow cell to detect light obscuration, allowing for high-integrity light obscuration signal data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light scatter detection is used for particle analysis, then the system can provide particle information, but the measurement accuracy and reliability are insufficient compared to light obscuration
Solution Approach 1:
The patent combines light scatter detection and light obscuration detection into a single integrated optical system. The flow cell is designed to accommodate both detection methods simultaneously, with the laser source illuminating particles and both scatter and obscuration signals being detected through coordinated optical paths. This merging allows the system to achieve high measurement precision through light obscuration while maintaining the complementary information from light scatter, resolving the contradiction between measurement accuracy and system complexity.
Solution Approach 2:
The optical system is designed with multi-functionality to perform both light scatter detection and light obscuration detection. The flow cell geometry and optical components are configured to enable dual measurement modes, allowing the same system to provide comprehensive particle analysis through multiple detection mechanisms. This universal design enables the system to achieve high measurement precision without requiring separate dedicated systems for each detection method.
2Reliability
If a properly dimensioned flow cell with laser fan generator is introduced for light obscuration measurement, then high-integrity light obscuration signal data can be collected, but the device complexity increases
Solution Approach 1:
The flow cell is designed with specific local geometric qualities optimized for light obscuration detection. The channel dimensions, wall thickness, and optical interface geometries are locally tailored to maximize light transmission and minimize stray light. The laser fan generator is positioned and configured with specific angular characteristics to create an optimized illumination pattern through the flow cell. These localized quality optimizations enable high signal integrity without requiring complete system redesign.
Solution Approach 2:
The flow cell acts as an intermediary element that mediates between the laser source and the photodiode detector. Its specifically designed geometry and optical properties facilitate efficient light transmission while maintaining particle suspension. The flow cell structure serves as the critical intermediary that enables reliable light obscuration measurement by optimizing the optical path and minimizing interference, thereby achieving high signal integrity without excessive system complexity.
3Loss of information
If light obscuration detection is implemented to improve particle analysis, then more useful particle information can be obtained, but the system requires additional optical components and configuration
Solution Approach 1:
The patent merges light scatter detection and light obscuration detection into a unified optical system. By combining these two detection methods, the system recovers complete particle information that neither method could provide alone. The optical components are integrated to simultaneously capture both scatter signals and obscuration signals, eliminating information loss while avoiding the need for completely separate detection systems.
Solution Approach 2:
The optical system is designed with universal multi-functionality to perform both light scatter and light obscuration detection. This multi-functional design allows the same optical components and flow cell to serve multiple detection purposes, providing complete particle information without requiring entirely separate specialized systems for each detection method.
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
Enables accurate and reliable detection and analysis of particles based on light obscuration signals, providing detailed information on particle size, shape, and features with enhanced imaging capabilities.
Implementation Method 1
The light obscuration technique, which is sometimes referred to as single particle optical sensing, involves the back illumination of a fluid, with a laser such that the loss of light due to the particle can be detected by a single photodiode
Implementation Method 2
other measurement techniques can be more useful. One such technique of interest is light obscuration... detection of light loss is easier and more accurate than detection by light scatter
Implementation Method 3
involves the back illumination of a fluid, with a laser such that the loss of light due to the particle can be detected by a single photodiode
Data Source
AI summary
An imaging flow cytometry system and method which includes a flow chamber, light obscuration analysis and imaging optics, image capturing system, device to regulate fluid flow through the chamber, and backlighting generator. The flow cell is configured so that light obscuration signals can be detected from the same passing particles that are imaged.