Microfluidic DNA Extraction Device With Pneumatic Valves
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Solution Overview
Problem
Current DNA extraction methods are either low-cost or high-throughput but not both, and the use of expensive robots is necessary for high-throughput magnetic bead methods, making them inaccessible to small and medium-sized users.
Innovation Solution
A microfluidic device with a feeder layer, buffer layer, and pneumatic layer, featuring multiple channels and pop-up blisters for buffer solutions, including magnetic binding, washing, and elution buffers, which allows for high-throughput DNA extraction without the need for expensive robots by using an electromagnetic plate and pneumatically controlled valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If magnetic bead methods are used for high-throughput DNA extraction, then extraction speed and throughput are improved, but device cost and complexity increase due to requirement of expensive robots
Solution Approach 1:
The device is divided into multiple independent extraction channels (e.g., 8 channels) that can operate simultaneously, allowing parallel processing of multiple samples. Each channel contains its own magnetic bead reaction area, buffer reservoirs, and valve control, enabling high-throughput extraction without requiring a single complex robotic system
Solution Approach 2:
The patent replaces expensive robotic mechanical systems with a simplified pneumatic control system. Pop-up valves controlled by pneumatic pressure replace complex robotic liquid handling, and magnetic fields replace mechanical mixing and separation operations, significantly reducing device complexity and cost while maintaining high throughput
2Loss of time
If magnetic bead methods are used for high-throughput DNA extraction, then extraction speed is improved, but cost per sample increases due to expensive equipment
Solution Approach 1:
Buffer solutions are pre-loaded into pop-up blister reservoirs within the device before use. The magnetic beads are pre-coated on the channel surfaces or pre-added to reaction chambers. This preliminary preparation eliminates time-consuming setup steps during actual extraction operations, enabling rapid high-throughput processing
Solution Approach 2:
The device enables continuous operation by having multiple channels ready for simultaneous processing. While one channel is undergoing extraction, other channels can be prepared or are already in different stages of the protocol. The pneumatic valve system allows continuous fluid flow and reagent delivery without interruption, maximizing throughput while keeping individual channel operations simple
3Productivity
If multiple samples are processed simultaneously, then throughput is improved, but cost-effectiveness decreases due to requirement of high-throughput equipment
Solution Approach 1:
The device is segmented into multiple independent but identical channels, each capable of complete DNA extraction workflow. This modular design allows simultaneous processing of multiple samples using simple, low-cost components that can be manufactured at scale, improving throughput while maintaining cost-effectiveness
Solution Approach 2:
The device incorporates self-contained buffer reservoirs (pop-up blisters) and pre-configured magnetic bead areas in each channel. The system uses passive magnetic field application and pneumatic pressure-driven fluid flow, eliminating the need for expensive external robotic assistance. Each channel is essentially self-sufficient, allowing parallel operation with minimal operational complexity and low per-sample cost
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 device enables rapid, high-quality DNA extraction in a short time, reducing extraction costs and time while maintaining high throughput, making it suitable for small and medium-sized users.
Implementation Method 1
the magnetic beads are attracted by an external magnetic field to an outer edge of the channel and immobilized
Implementation Method 2
pneumatically controlled valves
Data Source
AI summary
A microfluidic device for extracting DNA is provided. The microfluidic device includes a feeder layer, a buffer layer and a pneumatic layer which are sealed and stacked in sequence. An electromagnetic plate is arranged between the buffer layer and the pneumatic layer. The feeder layer is provided with multiple main channels and three blister openings. A syringe pump is connected to an inlet of each main channel. The buffer layer is provided with segmented buffer channels, each segmented buffer channel is provided with multiple subchannels, and each segmented buffer channel corresponds to one pop-type blister. The buffer channel is communicated with a main channel. The pop-type blister is communicated with an inlet of the segmented buffer channel. The pop-type blister is arranged at the top of the feeder layer and is communicated with the inlet of the segmented buffer channel through the blister opening.