Microfluidic Chip Double-Spiral Buffer Channels Magnetic Bead Resuspension
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Solution Overview
Problem
Microfluidic chips face inefficiencies in nucleic acid extraction due to low resuspension efficiency of magnetic beads, leading to insufficient contact between reagents and magnetic beads, which reduces extraction efficiency.
Innovation Solution
A microfluidic chip design with double-spiral shaped buffer flow channels and a magnetic control device that applies magnetic fields independently to buffer areas, allowing for extended interaction time between reagents and magnetic beads, and includes specific inlets and outlets for reagents to improve nucleic acid extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If magnetic beads are used for nucleic acid extraction in microfluidic chips, then automation and integration are improved, but resuspension efficiency of magnetic beads decreases leading to insufficient contact between reagents and magnetic beads
Solution Approach 1:
The patent transforms the static magnetic bead suspension problem into a dynamic solution by introducing periodic magnetic field application. The magnetic field is applied intermittently to buffer areas to dynamically control magnetic bead movement, enhancing resuspension efficiency while maintaining automation. This dynamic approach allows magnetic beads to be periodically agitated and redistributed, ensuring sufficient contact with reagents throughout the extraction process.
Solution Approach 2:
The patent implements periodic action through intermittent magnetic field application to buffer areas. The magnetic field is applied in cycles rather than continuously, creating periodic motion of magnetic beads that improves resuspension. This periodic stimulation ensures magnetic beads repeatedly contact reagents, solving the insufficient contact problem while maintaining the automated microfluidic extraction system.
2Productivity
If buffer flow channels are extended to increase interaction time between reagents and magnetic beads, then extraction efficiency is improved, but chip area and device complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-positioning buffer flow channels in series within buffer areas before the extraction process begins. The double-spiral configuration is pre-designed to guide reagent flow through multiple buffer zones, ensuring extended interaction time is built into the chip structure from the start. This preliminary arrangement of flow paths achieves efficient extraction without requiring additional chip area during operation.
Solution Approach 2:
The patent utilizes the double-spiral shape of buffer flow channels to create a three-dimensional flow path arrangement within a compact two-dimensional chip area. By winding the flow channels in a double-spiral pattern, the patent effectively extends the interaction path length without proportionally increasing the chip's footprint, thus maintaining high extraction efficiency while minimizing chip area occupation.
3Measurement precision
If multiple inlets and outlets are added to improve reagent delivery and magnetic bead control, then extraction precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the microfluidic chip into distinct functional zones with dedicated inlets and outlets for different reagents and processes. Each buffer area has specific flow control points, allowing precise delivery of reagents to where they are needed. This segmentation enables independent control of different extraction steps (lysis, binding, washing, elution) while maintaining an integrated chip structure, thus improving precision without overwhelming complexity.
Solution Approach 2:
The patent designs the microfluidic channel system with multi-functional inlets and outlets that serve multiple purposes. The same channel infrastructure is used for delivering different reagents (lysis buffer, binding buffer, washing buffer, elution buffer) and for controlling magnetic bead movement throughout the extraction process. This universal channel design reduces the number of separate components needed, improving extraction precision while limiting the increase in device complexity.
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 design enhances the resuspension and interaction of magnetic beads with reagents, improving nucleic acid extraction efficiency by ensuring stable attachment and separation of nucleic acids from magnetic beads.
Implementation Method 1
a first substrate having at least two buffer areas configured to cooperate with a magnet
Implementation Method 2
configured to cooperate with a magnet
Data Source
AI summary
The present disclosure provides a microfluidic chip configured to extract a nucleic acid, the microfluidic chip including: a first substrate having at least two buffer areas configured to cooperate with a magnet, and being provided with a microfluidic channel, wherein the microfluidic channel includes a primary flow channel and a plurality of buffer flow channels connected in series to the primary flow channel, the buffer flow channels are in the buffer areas, different buffer flow channels are in different buffer areas, respectively, and each of the buffer flow channels has a double-spiral shape; and a second substrate opposite to the first substrate. The microfluidic chip has a plurality of openings in communication with the primary flow channel. The present disclosure further provides a nucleic acid extraction apparatus and a nucleic acid extraction method.