Microfluidic Particle Detection via Displacement and Optical Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional flow cytometry systems are bulky and costly, making them inaccessible for routine clinical use and 'on-site' testing, particularly due to the need for sophisticated detection techniques and high maintenance, which limits their ability to detect small amounts of particles with high sensitivity and cost-effectiveness.
Innovation Solution
A method and device involving a detection chamber where labelled particles are displaced and reintroduced to determine their number by optical detection, using a processor to calculate the mean value from multiple subsets, allowing for compact and cost-efficient particle detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional flow cytometry systems are used, then particle detection capability is achieved, but device size and cost increase
Solution Approach 1:
The flow cytometry system is divided into separate functional modules: a microfluidic chip for particle manipulation and detection, a separate laser module for illumination, and independent detection electronics. This segmentation allows the core detection function to be miniaturized while maintaining performance, resolving the contradiction between detection capability and device size.
Solution Approach 2:
The detection chamber is designed as a nested structure where particles flow through a core stream that is surrounded and focused by a sheath fluid. This nested configuration allows hydrodynamic focusing to occur within a compact volume, enabling precise particle alignment and detection in a miniaturized device without sacrificing measurement precision.
2Measurement precision
If conventional flow cytometry systems are used, then particle detection capability is achieved, but system complexity and cost increase
Solution Approach 1:
The microfluidic chip incorporates integrated hydrodynamic focusing where the sheath fluid automatically aligns particles in the core stream through flow dynamics alone, without requiring external mechanical positioning systems or complex control mechanisms. This self-organizing flow pattern simplifies the overall system while maintaining precise particle detection capability.
Solution Approach 2:
The system uses hydraulic principles to achieve particle manipulation and focusing through fluid flow dynamics. The sheath fluid flow automatically centers and focuses particles in the detection region, replacing the need for complex mechanical or electronic positioning systems and reducing overall system complexity.
3Measurement precision
If sophisticated detection techniques are used, then detection sensitivity is improved, but maintenance requirements and costs increase
Solution Approach 1:
The microfluidic detection chip is designed as a disposable component that can be manufactured at low cost using standard microfabrication techniques. After use, the entire chip is discarded rather than requiring complex maintenance, calibration, or cleaning procedures, thereby reducing maintenance requirements and operational costs while maintaining high detection sensitivity.
Solution Approach 2:
The system optimizes detection sensitivity by carefully controlling fluid flow parameters (flow rates, pressure gradients) and optical parameters (laser power, detection angles) rather than relying on complex instrumentation. These parameter optimizations can be achieved with simple, maintainable components, reducing the need for sophisticated and high-maintenance equipment.
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 the sensitive and cost-effective detection of particles, suitable for 'on-site' use, with the ability to accurately determine particle numbers in small samples without the need for complex instrumentation.
Implementation Method 1
an actuator configured to displace some of the multiple labelled particles from the detection chamber
Implementation Method 2
a detector configured to detect labelled particles of the first subset of labelled particles
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to devices and methods for the qualitative and/or quantitative detection of particles. In particular, the invention relates to devices for the detection of particles, comprising a reaction chamber formed within a chamber body between a first surface and a second surface, wherein the second surface is located opposite to the first surface, and one or more displacers, wherein the distance between the first surface and the second surface is variable via the one or more displacers at least in one or more parts of the surface area of the first surface and/or the second surface. The invention also relates to corresponding methods for the detection of particles, comprising positioning a sample supposed to comprise one or more species of particles to be detected in a reaction chamber, displacing at least a part of the sample within the reaction chamber via the one or more displacers; and detecting/determining a value indicative for the presence and/or number of one or more species of particles.