Solid Reagent Containment for Automated Microfluidic PCR Prep
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Lab-On-a-Chip devices require complex preliminary treatments by skilled personnel due to the loading of pre-treated samples, complicating analysis operations, especially for nucleic acid detection using PCR.
Innovation Solution
A portable microfluidic device with a solid reagent containment unit that automates sample preparation and analysis, utilizing gravity and suction pressure for liquid movement, incorporating a control machine with actuators and valves to handle magnetic beads and perform real-time PCR, simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pre-treated samples are loaded into Lab-On-a-Chip devices, then analysis operations can be performed, but complex preliminary treatments by skilled personnel are required
Solution Approach 1:
The patent incorporates solid reagent containment units with lyophilized reagents directly into the microfluidic cartridge before use. This preliminary preparation of reagents in solid form eliminates the need for complex liquid handling and preparation steps by the operator, as the reagents are already positioned and prepared for automated dissolution and reaction during the analysis process.
Solution Approach 2:
The system employs automated fluid handling where the device itself performs the preliminary treatment steps without requiring skilled personnel intervention. The microfluidic system automatically dissolves the solid reagents, mixes them with samples, and performs the necessary pre-treatment operations through integrated pumps and channels, making the system self-sufficient.
2Extent of automation
If automated sample preparation and analysis is implemented, then skilled personnel are reduced, but device complexity increases
Solution Approach 1:
The device is divided into distinct functional modules: solid reagent containment units, microfluidic channels, magnetic bead manipulation zones, and detection chambers. Each module performs a specific function independently, allowing the overall automation complex to be managed through modular components rather than a monolithic complex system.
Solution Approach 2:
Magnetic beads serve as intermediaries that facilitate automated manipulation of biological samples and reagents throughout the microfluidic system. The beads can be magnetically controlled to move, mix, separate, and transfer samples through different zones, providing a simple magnetic actuation mechanism that drives complex automated processing without requiring complicated mechanical systems.
3Stability of the object's composition
If solid reagent containment units are used, then reagent stability is improved, but manufacturing complexity increases
Solution Approach 1:
The reagents are prepared in lyophilized (freeze-dried) solid form within the containment units. This phase transition from liquid to solid state provides long-term stability and ease of storage without refrigeration. The lyophilization process is a well-established manufacturing technique that converts liquid reagent solutions into stable solid powders that can be easily filled into microfluidic cartridges using automated dispensing equipment.
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 fast, automated, and inexpensive nucleic acid analysis in non-hospital environments, reducing the need for skilled personnel and simplifying sample preparation steps.
Implementation Method 1
utilizing gravity and suction pressure for liquid movement
Implementation Method 2
utilizing gravity and suction pressure for liquid movement
Implementation Method 3
incorporating a control machine with actuators and valves to handle magnetic beads
Data Source
AI summary
A solid reagent containment unit is formed by a support; a frame body fixed to the support and delimiting internally, together with the support, an analysis volume; a reagent-adhesion structure within the analysis volume; and at least one reagent cavity, which extends within the reagent-adhesion structure. The reagent-adhesion structure is of an adhesion material embossable at temperatures lower by 6-8° C. than its own melting point and has a melting point such as not to interfere with the analysis. The reagent cavity forms a retention wall, laterally surrounding the reagent cavity, and houses dried reagents. The adhesion material is chosen among wax, such as paraffin, a polymer, such as polycaprolactone, a solid fat, such as cocoa butter, and a gel, such as hydrogel or organogel.