Digital Separation Chip with Cliff Structures for Rapid Nucleic Acid Quantification
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Solution Overview
Problem
Current methods for nucleic acid detection in body fluids, such as real-time PCR, require multiple steps, expensive equipment, and trained technicians, and are not suitable for point-of-care settings due to the need for centralized laboratories and sample transportation, which can lead to sample degradation and limited access for low-resource sites.
Innovation Solution
The Digital Separation (DS) chip integrates sample fluid separation and digital quantitative analysis into a single, portable device using degas driven flow, allowing for automatic separation and compartmentalization of samples without external power sources, enabling rapid NA quantification in whole blood within 30 minutes, and can be used for various assays including protein analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time PCR is used for nucleic acid detection, then detection accuracy is improved, but device complexity and cost increase significantly
Solution Approach 1:
The device segments the sample into multiple compartments or wells, allowing parallel processing of multiple samples or dilutions. This segmentation enables digital PCR functionality by isolating individual nucleic acid molecules in separate compartments, achieving absolute quantification without requiring complex standard curves or reference samples.
Solution Approach 2:
The microfluidic chip serves multiple functions: sample preparation, nucleic acid amplification, and detection all in one device. The system can perform both qualitative and quantitative analysis, and can be adapted for different nucleic acid targets, making it a universal platform that replaces multiple specialized instruments.
2Reliability
If real-time PCR with multiple manual steps is used, then detection reliability is improved, but loss of time increases
Solution Approach 1:
The device merges sample preparation, nucleic acid extraction, amplification, and detection steps into a single integrated microfluidic platform. Multiple operations that traditionally required separate instruments and manual transfers are combined into automated fluidic pathways, reducing both time and potential contamination points while maintaining reliability.
Solution Approach 2:
The system performs preliminary sample preparation and nucleic acid extraction automatically before amplification begins. Reagents are pre-loaded into the microfluidic chip, and sample processing steps are automated in advance, eliminating delays associated with manual preparation and allowing the assay to proceed continuously without interruption.
3Measurement precision
If centralized laboratory testing is used, then measurement precision is improved, but loss of time in sample transportation increases
Solution Approach 1:
The device enables point-of-care testing where the sample is processed at or near the patient location rather than being transported to a centralized laboratory. The portable microfluidic system performs all necessary operations autonomously, allowing immediate results without sample shipping delays or storage requirements, while maintaining diagnostic accuracy through integrated controls.
4Measurement precision
If sample purification steps are added to remove contaminants, then measurement precision is improved, but device complexity and loss of time increase
Solution Approach 1:
Nucleic acid extraction and purification are merged with the amplification step in a single automated microfluidic process. The system uses integrated reagent delivery and mixing to perform purification without requiring separate manual handling steps or additional equipment, reducing complexity while ensuring contaminant removal for accurate polymerase activity measurement.
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 DS chip provides a cost-effective, portable solution for rapid and quantitative NA detection, reducing assay time to under 40 minutes with minimal manual operation, high throughput, and the ability to process large numbers of samples in parallel, while maintaining high separation efficiency and minimizing hemolysis and clogging issues.
Implementation Method 1
The DS chip may be comprised of a gas permeable material allowing the chip to be loaded with a fluid sample using degas driven flow
Implementation Method 2
The cliff structure may promote particle separation from the fluid sample
Data Source
AI summary
A Digital Separation (DS) chip for separating, digitizing and analyzing a fluid sample is presented. The DS chip includes a fluidic layer that prepares and compartmentalizes the fluid sample for analysis. Cliff structures that are adjacent to wells skim the fluid sample and prevent particles, which may interfere with fluid sample analysis, from entering the wells. Skimmed fluid sample analysis occurs in the wells and endpoint data can be collected and used to determine an original concentration of a desired component in the fluid sample very quickly. Using the described apparatus and methods, a fluid sample can be prepared, digitized, compartmentalized, assayed and the endpoint data collected in ˜30 minutes. The apparatus and methods can easily be adapted to provide parallel processing of a sample.