Continuous Flow Digital Droplet PCR System for High-Throughput Analysis
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Solution Overview
Problem
Current digital PCR methods require sample purification and are not suitable for immediate, continuous analysis of large sample volumes, limiting their application in mobile and high-throughput testing scenarios.
Innovation Solution
A portable continuous flow dPCR system that automates digital droplet PCR analysis by injecting samples into a mixer with PCR mastermix and probes, breaking them into droplets, and thermocycling for amplification, allowing for continuous fluid processing and accurate quantification without disrupting the fluid stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital PCR is performed using traditional batch processing methods, then sample purification can be achieved, but the analysis time and throughput are significantly reduced
Solution Approach 1:
The system performs sample purification and preparation steps before the main PCR amplification process. The continuous flow system pre-processes samples by mixing with lysis buffer and performing magnetic bead-based purification in-line before droplet generation, ensuring samples are ready for immediate analysis without disrupting the continuous flow process
Solution Approach 2:
The system maintains continuous flow of samples through the entire processing pipeline from injection to droplet generation to PCR amplification. Samples are continuously introduced, processed, and analyzed without batch interruptions, enabling high-throughput analysis while maintaining purification quality through the continuous magnetic bead-based cleanup process
2Reliability
If manual sample processing is used, then sample purification can be performed, but labor intensity and processing time increase
Solution Approach 1:
The system automates the entire workflow from sample injection through droplet generation and PCR amplification. The continuous flow system self-regulates fluid handling, mixing, and droplet formation without manual intervention, while the magnetic bead-based purification automatically captures and releases DNA targets through programmed magnetic field application and buffer exchange
Solution Approach 2:
The system replaces manual mechanical pipetting and handling with automated fluid injection and magnetic bead manipulation. The magnetic field application for bead-based purification replaces manual centrifugation or filtration steps, and the continuous flow droplet generation replaces manual droplet formation techniques
3Quantity of substance
If large volumes of samples are processed in batches, then comprehensive testing can be achieved, but the time required for analysis increases
Solution Approach 1:
The system processes large volumes of samples continuously through the flow system, with samples being introduced, processed, and analyzed in an unbroken sequence. The continuous droplet generation and continuous PCR amplification in the thermal cycler enable high-volume processing without the time losses associated with batch processing between samples
Solution Approach 2:
The system divides large sample volumes into numerous small droplets, each containing a small volume of the original sample. This segmentation allows parallel processing of many samples simultaneously through the continuous flow system and in the thermal cycler, dramatically increasing throughput while maintaining comprehensive testing coverage
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 immediate and accurate quantification of DNA in a continuous fluid stream, enhancing sensitivity and throughput, making it suitable for mobile and high-volume sample analysis.
Implementation Method 1
The droplet generator converts the sample mixture into an emulsion where aqueous droplets of the reaction mixture are maintained inside of an immiscible oil phase
Implementation Method 2
The droplets are then thermocycled to amplify their nucleic acid contents by PCR
Data Source
AI summary
Systems and methods for continuous flow polymerase chain reaction (PCR) are provided. The system comprises an injector, a mixer, a coalescer, a droplet generator, a detector, a digital PCR system, and a controller. The injector takes in a sample, partitions the sample into sample aliquots with the help of an immiscible oil phase, dispenses waste, and sends the sample aliquot to the mixer. The mixer mixes the sample aliquot with a PCR master mix and diluting water, dispenses waste, and sends the sample mixture (separated by an immiscible oil) to the coalescer. The coalescer coalesces the sample mixture with primers dispensed from a cassette, dispenses waste, and sends the reaction mixture (separated by an immiscible oil) to the droplet generator. The droplet generator converts the sample mixture into an emulsion where aqueous droplets of the reaction mixture are maintained inside of an immiscible oil phase and dispenses droplets to the digital PCR system. The digital PCR system amplifies target DNAs in the droplets. The detector detects target DNAs in the droplets. The controller controls the system to run automatically and continuously.