Microfluidic Probe Hydrodynamic Flow Confinement
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Solution Overview
Problem
Existing microfluidic biochip manufacturing methods require dry environments, which are unsuitable for biological components, necessitating additional preparation steps and realignment of substrates for bio-patterning.
Innovation Solution
A method using a microfluidic probe head to pattern a substrate by generating hydrodynamically confined liquid flows, including an etching flow for structuring the substrate and a processing flow for functionalizing the microstructures with biomolecules, all within a wet environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional micro-milling, laser ablation, embossing, and mold injection methods are used to fabricate microchannels and microstructures, then manufacturing precision and structural complexity are improved, but the process requires dry environments which are unsuitable for biological components, and additional preparation steps are needed
Solution Approach 1:
The patent replaces traditional mechanical fabrication methods (micro-milling, embossing, mold injection) with a liquid-based microfluidic approach. A microfluidic probe delivers confined liquid flows that chemically etch and functionalize the substrate, eliminating the need for mechanical contact and dry environment processing. This substitution enables direct processing of biological components in aqueous environments.
Solution Approach 2:
The patent changes the fundamental processing parameter from mechanical force to liquid flow dynamics. By controlling liquid flow rate, confinement geometry, and chemical composition, the system achieves precise microfabrication and biofunctionalization. The liquid flow parameters (velocity, pressure, confinement ratio) are tuned to enable both etching and biomolecule deposition without environment changes.
2Manufacturing precision
If traditional sequential processes with multiple preparation steps are used for microfabrication and bio-patterning, then manufacturing precision is maintained, but fabrication time and process complexity increase
Solution Approach 1:
The patent merges multiple sequential steps (microfabrication, cleaning, drying, bio-patterning) into a single continuous liquid-based process. The microfluidic probe sequentially delivers etching liquid, rinsing liquid, and biomolecule-containing liquid through the same confined flow path, combining what were previously separate process stages into one integrated operation.
Solution Approach 2:
The patent maintains continuous liquid flow throughout the entire process without interrupting the aqueous environment. The microfluidic probe continuously delivers different liquids in sequence, eliminating idle time between steps and avoiding the need to stop, dry, and re-align the substrate between fabrication and bio-patterning operations.
3Measurement precision
If substrate realignment is performed between microfabrication and bio-patterning steps, then positioning precision is improved, but operation complexity and time consumption increase
Solution Approach 1:
The microfluidic probe is designed to perform multiple functions (etching, rinsing, bio-patterning) through a single device. The same probe that creates microchannels also deposits biomolecules, eliminating the need for separate alignment procedures between different equipment stations. The probe's multi-functionality inherently solves the positioning problem.
Solution Approach 2:
The confined liquid flow acts as an intermediary that transfers both momentum and material precisely to the substrate. The liquid flow's confinement geometry and flow dynamics provide inherent positioning accuracy, replacing the need for mechanical alignment systems. The liquid mediator delivers biomolecules exactly where the microchannels were formed without requiring substrate movement or re-positioning.
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
This approach simplifies the fabrication process, reduces time, and allows for the creation of biofunctionalized chips, enabling new possibilities in biochip design and allowing assays to be performed immediately after patterning.
Implementation Method 1
liquid flows are generated between a processing surface of the probe head and the surface of the substrate... The liquid flows generated include a flow of an etching liquid... The etching flow is hydrodynamically confined inside an immersion liquid
Implementation Method 2
The etching flow is hydrodynamically confined inside the immersion liquid to controllably structure the surface of the substrate. This causes to create a depression in the substrate, e.g., as a result of locally etching or dissolving the substrate
Implementation Method 3
The processing flow is generated after having interrupted the etching flow. The processing flow generated causes to pattern the depression created with particles (e.g., biomolecules, or metal or polymer particles) contained in the processing liquid... an additional flow confinement is used to controllably deposit the particles (e.g., biomolecules) onto the depressions formed
Data Source
AI summary
Patterning a substrate can be provided. A substrate is covered by an immersion liquid and a microfluidic probe head is positioned in proximity with the surface of the substrate, so as to immerse a processing surface of the probe head in the immersion liquid. Liquid flows are generated between the processing surface of the probe head and the surface of the substrate, via the probe head. The liquid flows generated include an etching flow of an etching liquid (e.g., an acid or solvent) and a processing flow of a processing liquid (e.g., a solution or suspension).