EWOD Device for Digital Nucleic Acid Amplification Dynamic Range
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Solution Overview
Problem
Conventional digital PCR systems require multiple instruments and manual processes to achieve accurate nucleic acid quantification, are inefficient in terms of time and reagents, and lack automation for sample dilution and partitioning, limiting their dynamic range and accuracy.
Innovation Solution
An enhanced electrowetting on dielectric (EWOD) device and method for digital nucleic acid amplification that automates sample dilution, partitioning, and quantification, using a single instrument to calculate optimal dilution factors and perform high-ratio dilutions within a minimal footprint, reducing reagent use and increasing dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional digital PCR systems are used, then accurate nucleic acid quantification can be achieved, but multiple instruments and manual processes are required, increasing device complexity and reducing productivity
Solution Approach 1:
The patent combines multiple separate functions (sample dilution, partitioning, amplification, and detection) into a single integrated EWOD device. The system performs high-ratio dilutions and digital PCR amplification within the same chip, eliminating the need for multiple external instruments and manual transfer steps between devices.
Solution Approach 2:
The EWOD device is designed to perform multiple operations universally: it can dilute samples by calculating optimal dilution factors, partition droplets into thousands of compartments, perform thermal cycling for amplification, and detect fluorescence signals - all within a single multi-functional platform.
2Measurement precision
If manual sample preparation and partitioning are performed, then accurate quantification is possible, but time consumption and reagent use increase significantly
Solution Approach 1:
The system performs preliminary automated actions by calculating the optimal dilution factor based on the target concentration and automatically executing the dilution before partitioning. This pre-calculated approach eliminates the need for trial-and-error manual dilutions and reduces preparation time while maintaining accuracy.
Solution Approach 2:
The EWOD device performs self-service automation where the system automatically calculates dilution factors, executes dilutions, partitions droplets, and initiates amplification without requiring manual intervention at each step, thereby reducing both time and reagent consumption.
3Manufacturing precision
If high-ratio dilutions are performed manually, then optimal sample concentration can be achieved, but the process is inefficient and lacks automation
Solution Approach 1:
The system incorporates feedback by calculating the optimal dilution factor based on the known target concentration and measured sample characteristics, then automatically adjusting the dilution ratio to achieve precise concentration control without manual intervention.
Solution Approach 2:
The system automatically changes the concentration parameter by calculating and executing precise dilution ratios. The EWOD device can dynamically adjust dilution factors based on input parameters, transforming manual concentration optimization into an automated parameter adjustment process.
4Adaptability or versatility
If multiple instruments are used for digital PCR, then comprehensive analysis is possible, but the system footprint and operational complexity increase
Solution Approach 1:
The patent implements a nested structure where multiple functional modules (dilution chamber, partitioning array, thermal cycling zones, and detection components) are integrated within a single compact EWOD chip, similar to nested dolls, thereby minimizing the overall footprint while maintaining comprehensive analysis capability.
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 solution streamlines digital nucleic acid amplification by automating sample preparation and quantification, reducing time to results, improving accuracy, and expanding the dynamic range of EWOD devices to analyze a wide range of initial sample concentrations using fewer droplets, thus enhancing the efficiency and precision of nucleic acid quantification.
Implementation Method 1
performing an electrowetting operation to extract a first sample droplet from the sample volume
Data Source
AI summary
A method of digital quantification of a species in an EWOD device includes inputting a sample volume and a diluent volume into the EWOD device; performing an electrowetting operation to generate a first sample droplet from the sample volume; performing an amplification process on the first sample droplet and measuring a turn-on value for the sample droplet; comparing the measured turn-on value to a target turn-on value for digital quantification; calculating a dilution factor based on the comparison of the measured and target turn-on values; performing an electrowetting operation to extract a second sample droplet from the sample volume; performing an electrowetting operation to dilute the second sample droplet with the diluent volume by the dilution factor to form a diluted second sample droplet; and performing a digital quantification on the diluted second sample droplet to quantify an initial concentration of the species in the sample volume.