Microfluidic Device Nucleic Acid Purification PCR
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Solution Overview
Problem
Existing microfluidic devices face inefficiencies and inaccuracies in nucleic acid analysis, particularly in the processes of sample preparation, purification, and amplification, which hinder the effective analysis and detection of DNA.
Innovation Solution
A microfluidic device with a filter unit using a silica filter for nucleic acid binding, a pump unit for controlled elution, and a reaction chamber for PCR, optimized for efficient nucleic acid processing, where the elution medium is precisely managed to ensure full utilization and minimize gas bubbles, allowing for enhanced sensitivity and rapid analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional microfluidic devices are used for nucleic acid analysis, then the device structure is simple, but the analysis efficiency and accuracy are insufficient
Solution Approach 1:
The patent combines multiple functional units (lysis chamber, filtration chamber, elution chamber, PCR chamber) into a single integrated microfluidic device, allowing sequential processing of nucleic acid analysis steps within one device structure, thereby improving analysis efficiency without requiring multiple separate devices
Solution Approach 2:
The device is divided into distinct functional chambers (lysis, filtration, elution, PCR) that can operate independently in sequence, enabling efficient multi-step processing while maintaining a relatively simple overall device structure through modular design
2Measurement precision
If conventional filtration methods are used, then the filtration process is simple, but nucleic acid binding efficiency is insufficient
Solution Approach 1:
The patent employs a porous filter membrane in the filtration chamber that provides high surface area and porosity for enhanced nucleic acid binding capacity, improving binding efficiency while maintaining a simple filtration chamber structure
Solution Approach 2:
The filter membrane is positioned specifically in the filtration chamber where nucleic acid binding is required, concentrating the binding function in a localized high-performance region while keeping other parts of the device structurally simple
3Measurement precision
If conventional elution methods are used, then the elution process is simple, but eluted nucleic acid utilization is insufficient leading to reduced sensitivity
Solution Approach 1:
The microfluidic device enables continuous flow of elution medium through the filtration chamber, ensuring complete elution of bound nucleic acids and maximizing the amount of recovered nucleic acid for subsequent PCR amplification, thereby improving detection sensitivity
Solution Approach 2:
The device design ensures that the elution medium flow rate and volume are controlled to optimize nucleic acid recovery, with the system automatically ensuring complete elution through the integrated microfluidic pathways, improving sensitivity without complex external control
4Reliability
If conventional PCR amplification is used, then the amplification process is simple, but gas bubble formation interferes with reaction accuracy
Solution Approach 1:
The gas bubble is extracted or removed from the reaction system by designing the microfluidic channels to allow bubbles to escape or be vented before entering the PCR chamber, preventing interference with the amplification reaction and maintaining reaction accuracy
Solution Approach 2:
The microfluidic channel structure acts as an intermediary that filters or redirects gas bubbles away from the PCR reaction zone, allowing the amplification reaction to proceed accurately without direct bubble interference
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 microfluidic device enables efficient nucleic acid purification and amplification by ensuring all eluted nucleic acids are used, increasing sensitivity and reducing the need for repeated amplification cycles, while preventing gas bubbles that could interfere with reactions.
Implementation Method 1
the nucleic acids are adsorbed on the filter
Implementation Method 2
a pump unit for controlled elution
Implementation Method 3
physical phenomena, which are generally associated with microtechnology, are relevant in the fluid channels and chambers arranged therein. These include for example capillary effects, effects (in particular mechanical effects) which are related to surface tensions of the fluid
Implementation Method 4
They furthermore include effects such as thermophoresis and electrophoresis
Implementation Method 5
They furthermore include effects such as thermophoresis and electrophoresis
Data Source
AI summary
A microfluidic device for analysing nucleic acids includes a pump unit with a pumping volume, a filter unit for receiving a lysate, and a reaction chamber. The pump unit, the filter unit and the reaction chamber are arranged in the stated order in a pump direction of the pump unit. The microfluidic device is configured to pump an elution medium via the pump unit into the filter unit for elution and subsequently into the reaction chamber for further treatment.