Microfluidic Inertial Focusing for High-Throughput Particulate Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for separating particulates from fluids, such as blood, face challenges including low separation efficiency for heterogeneous cell populations, clogging, and the need for complex equipment or dilution, especially when handling large volumes, and there is a lack of efficient, equipment-free solutions for high-speed particulate separation.
Innovation Solution
A microfluidic device comprising a microchannel and a mesofluidic collection chamber that uses fluidic expansion and sedimentation to separate particulates from a base fluid, allowing for high-speed and efficient separation without the need for centrifuges or extensive equipment, by introducing the fluid under a force field that causes particulates to delaminate and sediment in the collection chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If filtration techniques are used to capture cells, then separation is achieved, but separation efficiency for heterogeneous cell populations is low and clogging occurs
Solution Approach 1:
The patent replaces mechanical filtration systems with a microfluidic inertial focusing system that uses fluid dynamics and inertial forces to separate cells. The microchannel geometry creates specific flow patterns that focus different cell types at different positions, eliminating physical filters that clog while maintaining high separation efficiency for heterogeneous populations.
Solution Approach 2:
The patent changes the flow regime parameters by controlling Reynolds number and inertial forces within the microchannel to achieve focusing effects. By adjusting flow rate and channel dimensions, the system optimizes inertial migration velocities to separate different cell types based on their size and density without mechanical contact.
2Productivity
If microfluidic separation techniques are used, then separation is achieved, but pre-dilution is required and volumetric flow rates are limited
Solution Approach 1:
The patent creates different flow conditions in different regions of the microchannel. The channel geometry varies along its length, with specific sections designed to create focusing effects while other sections maintain high flow rates. This local variation in flow characteristics allows undiluted samples to be processed at high volumetric flow rates without requiring pre-dilution.
Solution Approach 2:
The patent uses dynamic flow control where the fluid velocity and pressure gradients are optimized during operation. The system adapts flow conditions to maintain inertial focusing effects at higher flow rates than traditional microfluidic devices, enabling high throughput processing of undiluted samples.
3Productivity
If field flow fractionation is used, then separation is achieved, but dilute starting samples are required
Solution Approach 1:
The patent replaces field flow fractionation techniques with inertial focusing in microchannels. This substitution eliminates the need for dilute samples by using geometrically-induced flow patterns that effectively separate cells at high concentrations. The microchannel design creates focusing effects that work efficiently with concentrated, undiluted biological samples.
4Productivity
If high throughput separation is achieved, then volumetric flow rate increases, but flow rate control and sample pre-filtration become more complex
Solution Approach 1:
The patent designs the microchannel geometry to self-generate the necessary flow patterns for separation. The channel dimensions and curvature are optimized to automatically create inertial focusing effects at the desired flow rates, eliminating the need for complex external flow control mechanisms. The device structure itself performs the flow regulation function.
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 device enables rapid and efficient separation of particulates from large volumes of fluid with minimal human intervention, achieving high capture efficiency and throughput, and is suitable for point-of-care applications by minimizing equipment requirements and avoiding the need for sample dilution.
Implementation Method 1
The particulates dispersed in the base fluid traverse through the first microchannel under an influence of a force field
Implementation Method 2
at least a portion of the particulates in a portion of the base fluid are sedimented in the mesofluidic collection chamber
Data Source
AI summary
A separation device, system and associated method are provided herein for separation of particulates form a base fluid. The separation device comprises a first microchannel comprising a fluid inlet and a mesofluidic collection chamber. The mesofluidic collection chamber has a first side and a second side, wherein the mesofluidic collection chamber is operatively coupled to the first microchannel on the first side, and wherein the mesofluidic collection chamber comprises a first fluid outlet at the second side, such that the fluid inlet, first microchannel, and first fluid outlet are in fluidic communication via the mesofluidic collection chamber.