Compressible Microfluidic Channels for Gentle Microscale Object Isolation
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Solution Overview
Problem
Existing label-free microfluidic object isolation technologies, particularly those using active methods, can damage microscale objects like cancer cells and require low flow rates, limiting their efficiency and throughput.
Innovation Solution
A passive microscale object isolation system utilizing elastomeric bi-stable microstructures with unique curves and angles in microchannels that regulate fluid flow to generate secondary flows for efficient capture and release of microscale objects, such as cancer cells, by altering channel cross-sections through compression and decompression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If active isolation methods use external forces (acoustic waves and magnetic pulses) to isolate microscale objects, then isolation efficiency is improved, but object damage increases and throughput decreases
Solution Approach 1:
The patent replaces active mechanical forces (acoustic waves, magnetic pulses) with passive fluid dynamic forces. The microchannel geometry is designed to generate secondary flows and lift forces that naturally separate objects by size without applying external forces, thereby eliminating object damage while maintaining isolation efficiency
Solution Approach 2:
The patent changes the flow regime parameters by designing specific microchannel geometries (curved channels, varying cross-sections) that transform the fluid flow characteristics. This creates size-dependent lift forces and secondary flows that passively separate microscale objects, achieving high efficiency without the harmful effects of active forces
2Productivity
If active isolation methods use external forces to isolate microscale objects, then isolation efficiency is improved, but flow rate must be reduced
Solution Approach 1:
The patent modifies the microchannel geometry parameters (curvature, cross-sectional area variations) to generate size-dependent fluid dynamic forces. These geometric parameters create lift forces and secondary flows that separate objects efficiently at higher flow rates without requiring the low flow conditions needed for active force methods
3Reliability
If passive isolation methods are used without external forces, then object viability is maintained, but isolation efficiency decreases
Solution Approach 1:
The patent employs curved microchannel geometries that generate secondary flows and centrifugal effects. These curved paths create size-dependent lift forces that efficiently separate microscale objects passively, achieving high isolation efficiency while maintaining object viability through the use of gentle fluid dynamic forces rather than direct external forces
Solution Approach 2:
The patent utilizes three-dimensional flow patterns including secondary flows and vertical lift forces generated by the microchannel geometry. This multi-dimensional fluid dynamic approach enables efficient passive separation by exploiting size-dependent forces in multiple flow dimensions, achieving high isolation efficiency without external forces
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 high-efficiency capture and release of microscale objects, including cancer cells, while maintaining their viability for further analysis, without the need for external forces, thus enhancing isolation and recovery processes.
Implementation Method 1
regulates the secondary flow development for highly efficient object isolation, capture, and release of microscale objects from a fluidic medium
Implementation Method 2
The fluidic flow is controlled by uniquely designed microchannels containing various curves and angles
Implementation Method 3
When an external load is applied to the array of microstructures, the walls of the fluid flow channels contract vertically and the cross-sectional area of the fluid flow channels that initially have large cross-sectional reduces
Data Source
AI summary
A microfluidic object isolation device comprising a top plate, a bottom plate, at least one elastomeric perimeter wall disposed therebetween and defining an interior chamber, an array of elastomeric microstructures within the interior chamber, the microstructures spaced apart thereby defining microchannels between adjacent microstructures, wherein the fluid flow microchannels comprise object bypass zones and object capture zones, an ingress port structured and operable to ingress a fluidic medium into the interior chamber, the fluidic medium comprising large microscale objects and small microscale objects, and an egress port. The microfluidic object isolation device is compressible from a static state to a capture state whereby the microstructures are compressed to alter the fluid flow microchannels from a static shape and size to a capture shape and size whereby the large microscale objects of the fluidic medium are captured within the object capture zones.