Magnetically Controlled Microfluidic Valve for Automated Nucleic Acid Prep
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Solution Overview
Problem
Current Lab-On-Chip (LOC) systems for nucleic acid analysis require complex preliminary treatments, often performed by skilled personnel, due to the need for pre-treated samples, which complicates the analysis process and limits their use in non-hospital environments for fast, automated, and inexpensive testing.
Innovation Solution
A magnetically controllable valve and a portable microfluidic device that simplifies sample treatment and analysis by integrating automated extraction and amplification of nucleic acids within a miniaturized cartridge, using a fluidic circuit with magnetic beads for purification and real-time PCR for detection, allowing for sample preparation and analysis from raw biological samples without prior extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex preliminary treatments are performed manually by skilled personnel, then sample purification and preparation quality is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The system performs sample purification and preparation automatically through integrated magnetic bead-based extraction and real-time PCR amplification within the cartridge, eliminating the need for manual pre-treatment by skilled personnel while maintaining high purification quality
Solution Approach 2:
The patent combines multiple functions (sample extraction, purification, amplification, and detection) into a single integrated cartridge system, reducing the overall complexity of the treatment process while maintaining high manufacturing precision through automated operations
2Measurement precision
If manual pre-treatment steps are required, then sample analysis accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The cartridge system automatically performs all necessary pre-treatment steps including magnetic bead-based nucleic acid extraction and real-time PCR amplification, maintaining high detection accuracy while eliminating the need for skilled personnel to perform manual operations
Solution Approach 2:
The system replaces manual mechanical operations with automated magnetic field-based bead manipulation and programmed thermal cycling for PCR, ensuring consistent measurement precision while dramatically improving ease of operation
3Ease of operation
If automated extraction and amplification are integrated in a portable device, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent implements a nested structure where magnetic beads are contained within the cartridge, which itself is integrated into a portable device housing, allowing automated extraction and amplification functions to be compactly organized while maintaining ease of operation
Solution Approach 2:
The integrated cartridge system performs multiple functions (extraction, purification, amplification, and detection) within a single portable device, reducing operational complexity despite the sophisticated integration required, as the system is designed to handle all steps automatically
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
Enables simplified and automated sample preparation and analysis, reducing the need for skilled personnel and facilitating fast, cost-effective nucleic acid testing in various environments by automating the extraction and amplification processes within a portable device.
Implementation Method 1
specific capture of the target molecule to be purified using appropriately functionalized magnetic beads
Implementation Method 2
The valve (20-22) has a body (80, 80') and a shutter (140-142) movable between a first position, in which the shutter closes the orifice, and a second position, in which the shutter opens the orifice
Data Source
AI summary
The valve is formed in a valve body housing a first path portion, a second path portion, and an coupling zone between the first and second path portions. A shutter is arranged in the coupling zone and has a shutting portion of ferromagnetic material that is deformable under the action of an external magnetic field between an undeformed position, wherein the shutter closes the coupling zone, and a deformed position, wherein the shutter at least partially frees the coupling zone. The shutting portion of the shutter is formed by a rubber membrane incorporating particles, for example of ferrite particles.