OSTE Polymer Microfluidic Device for Continuous Flow Cell Lysis
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Solution Overview
Problem
Current methods for cell lysis in microfluidic devices are not suitable for rapid continuous flow processing, as they require high residence time and are not compatible with high-pressure conditions, leading to inefficiencies and increased healthcare costs in diagnosing bloodstream infections.
Innovation Solution
A microfluidic device fabricated using soft-lithography replica molding with an off-stoichiometry thiol-ene (OSTE) polymer, featuring constricted and non-constricted regions that apply mechanical shear stress to cells, enabling efficient cell lysis at high flow rates without deformation under pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional chemical lysis techniques are used, then cell lysis can be achieved, but the processing speed is too slow for rapid continuous flow applications
Solution Approach 1:
The patent replaces traditional chemical lysis methods with mechanical shearing forces generated by constricted regions in microfluidic channels. Cells are subjected to high shear stress as they pass through narrow constricted zones, causing rapid mechanical disruption of cell membranes and walls, enabling continuous flow processing at high speeds without requiring prolonged residence time.
Solution Approach 2:
The patent changes the physical parameters of the lysis process by transitioning from chemical reactions to mechanical force application. By controlling flow rate, channel constriction dimensions, and pressure differential, the system optimizes mechanical shear stress to achieve rapid cell lysis in continuous flow mode, fundamentally altering the lysis mechanism from chemical to physical parameters.
2Ease of manufacture
If soft materials like PDMS are used for soft-lithography fabrication, then device production cost decreases, but channel expansion occurs under high fluid pressure
Solution Approach 1:
The patent employs composite material structures combining soft-lithography fabricated components with rigid support elements or alternative materials that maintain dimensional stability under pressure. This approach preserves the cost advantages of soft-lithography while compensating for the inherent flexibility and pressure-induced expansion of elastomeric materials through structural reinforcement or hybrid construction.
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 OSTE polymer-based microfluidic device achieves rapid and consistent cell lysis with a cell-lysis rate of 85-100% at flow rates up to 1000 μL/min, maintaining channel integrity and preventing clogging, thus addressing the limitations of existing technologies.
Implementation Method 1
mechanical shearing of cells can offer the lysis speed to enable continuous-flow processing
Implementation Method 2
maintaining channel integrity and preventing clogging... without deformation under pressure
Data Source
AI summary
The present invention relates to methods and systems for cell lysis in a microfluidic device. More specifically, embodiments of the present invention relate to methods and systems for rapid continuous flow mechanical cell lysis. In one embodiment, a microfluidic device includes one or more microfluidic channels, each channel comprising constricted regions and non-constricted regions separating the constricted regions, wherein the constricted regions are configured to disrupt the cellular membranes of cells in fluid flowing through the one or more microfluidic channels.