Microfluidic Reactor Fluidic Channels Prevent Diffusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Microfluidic systems face challenges in maintaining high purity reactions due to diffusion of unwanted reagents, which complicates processes like DNA sequencing, requiring large flow cells, valves, and complex control systems that increase size, complexity, and cost, while mechanical valves are prone to failure and slow operation times.
Innovation Solution
A microfluidic device with a reaction chamber and fluidic channels configured to prevent diffusion of unwanted reagents through continuous flow, eliminating the need for on-chip valves, using fluidic resistance to manage reagent flow and employing a wash buffer to maintain high purity, allowing for fast reagent loading and unloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If valves are used to prevent diffusion of unwanted reagents into the reaction chamber, then reagent purity is improved, but device complexity and reliability worsen due to mechanical components
Solution Approach 1:
The patent removes valves from the microfluidic system entirely, extracting the problematic mechanical component that caused complexity and reliability issues. Instead of using valves to control reagent flow, the system uses passive fluidic design with multiple inlet channels that allow selective reagent introduction without mechanical actuators, thereby maintaining reagent purity while eliminating device complexity
Solution Approach 2:
The patent replaces the mechanical valve system with a fluidic control mechanism. Multiple inlet channels are designed to allow different reagents to flow into the reaction chamber simultaneously or sequentially based on flow rate control, eliminating the need for mechanical opening/closing actions while maintaining precise reagent delivery and purity
2Manufacturing precision
If valves are used to control reagent flow, then reagent purity is improved, but operation speed worsens due to valve switching time
Solution Approach 1:
The patent enables continuous flow of reagents through the reaction chamber by using multiple inlet channels that can be activated simultaneously or in rapid succession. This eliminates the stop-start operation inherent in valve-based systems, allowing continuous reagent introduction and reaction progression, thereby improving operation speed while maintaining purity through controlled flow rates
3Quantity of substance
If a large flow cell is used to perform sequencing reactions, then reaction capacity is improved, but reagent purity worsens due to longer diffusion paths and cross-contamination
Solution Approach 1:
The patent divides the flow cell into multiple reaction chambers or compartments, each with its own set of inlet channels. This segmentation allows parallel processing of multiple samples or reactions, increasing overall reaction capacity while maintaining short diffusion paths within each individual chamber, thereby preventing cross-contamination and preserving reagent purity
4Manufacturing precision
If washing buffer channels are added to remove remaining reagents, then reagent purity for next reaction is improved, but device complexity worsens
Solution Approach 1:
The patent designs the inlet channels to serve multiple functions: they can introduce different reagents during the reaction phase and can also serve as wash channels by introducing cleaning solutions between reactions. This multi-functionality eliminates the need for separate washing buffer channels, reducing device complexity while maintaining the ability to achieve high reagent purity for subsequent reactions
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 configuration enables high-purity microfluidic reactions with increased throughput and reliability, reducing the complexity and cost of the system by avoiding the need for mechanical valves and improving operational speed.
Implementation Method 1
preventing diffusion of unwanted reagents (nucleotides in the case of DNA sequencing) into the reaction chamber
Implementation Method 2
by introducing a continuous volume of flow in the reaction chamber and an equal continuous volume of flow out of the reaction chamber
Data Source
AI summary
Example embodiments relate to fast sample loading microfluidic reactors and systems. One embodiment includes a microfluidic device. The microfluidic device includes a reaction chamber allowing reacting of at least one fluid material. The microfluidic device also includes at least two fluidic channels coupled to the reaction chamber for providing a fluid to and exiting a fluid from, respectively, the reaction chamber. Each fluidic channel includes an inlet and an outlet. Each fluidic channel is configured such that when a first fluid is provided in the reaction chamber via that fluidic channel, the first fluid exits the reaction chamber via the outlet of at least one other fluidic channel when the reaction chamber is filled, thereby preventing a second fluid from the at least one other fluidic channel, when present in the inlet, from diffusing into the reaction chamber.