Convection PCR Microarray Chip for Portable 50-Plex DNA Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current DNA diagnostic technologies are limited by large size, high cost, and labor-intensive processes, making them unsuitable for point-of-care applications, and existing convection PCR instruments lack integrated systems for high-plex DNA analysis and efficient thermal control.
Innovation Solution
A portable, integrated apparatus for multiplexed DNA analysis using a convection PCR chip with a label-free microarray, featuring a mechanical system for chip loading and clamping, thermal control for distinct temperatures, and optical fluorescence imaging, enabling simultaneous detection of multiple DNA targets in a closed system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If commercial qPCR systems are used for multiplexed DNA detection, then detection capability is improved, but device size and cost increase significantly
Solution Approach 1:
The instrument is divided into functionally independent modules: a mechanical system for chip handling, a thermal control system with heating elements, and an optical detection system. Each module operates semi-independently, allowing for compact integration while maintaining high multiplexing capability through the microarray chip design.
Solution Approach 2:
The microarray chip is integrated within the reaction chamber, which is contained within the compact housing. The heating elements are embedded within the chip structure itself, and the optical detection system is nested within the same instrument body, creating a highly integrated compact device that achieves 50-plex detection in a portable format.
2Adaptability or versatility
If commercial qPCR systems are used for multiplexed DNA detection, then detection capability is improved, but instrument cost increases significantly
Solution Approach 1:
The system uses self-heating through resistive heating elements integrated into the chip, eliminating the need for external heating apparatus. The optical detection relies on simple LED excitation and camera-based detection rather than expensive specialized detectors, and the closed-tube design performs washing and detection automatically without manual intervention, significantly reducing operational costs.
Solution Approach 2:
The system employs disposable microarray chips that are pre-loaded with probes and reagents. Each chip is used for a single assay and then discarded, eliminating the need for expensive reusable components, complex cleaning protocols, and maintenance of expensive parts. This approach makes the instrument itself more affordable while maintaining high multiplexing capability.
3Weight of stationary object
If isothermal DNA amplification methods are used, then device portability is improved, but multiplexing capability is limited to 3-plex
Solution Approach 1:
The microarray chip features spatially distinct regions with different probe sequences arranged in a grid pattern, where each location is optimized for detecting a specific DNA target. This spatial encoding allows 50 or more different probes to be packed into a single chip while maintaining isothermal amplification conditions throughout the entire chip area, achieving high multiplexing without sacrificing portability.
4Adaptability or versatility
If next-generation sequencing is used for high multiplex analysis, then multiplexing capability is improved, but time consumption and labor intensity increase significantly
Solution Approach 1:
The microarray chip is pre-loaded with all necessary probes and the reaction chamber is pre-prepared with master mix containing polymerase and dNTPs before the assay begins. The closed-tube design pre-establishes the sealed environment, eliminating the need for post-amplification handling and reducing the workflow to a simple load-and-run process that completes in under two hours compared to NGS's twelve-hour library preparation and twenty-four-hour sequencing.
5Adaptability or versatility
If next-generation sequencing is used for high multiplex analysis, then multiplexing capability is improved, but labor intensity increases significantly
Solution Approach 1:
The closed-tube microarray system performs all washing, drying, and detection steps automatically without manual intervention. The mechanical system automatically loads and unloads chips, the thermal system maintains temperature profiles, and the optical system captures and processes images. The entire 50-plex assay runs unattended from sample loading to result generation, eliminating the labor-intensive library preparation and sequential processing steps required by NGS.
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 rapid, affordable, and efficient multiplexed DNA testing suitable for point-of-care applications, with the ability to analyze 50 or more DNA targets without the need for manual intervention or complex instruments.
Implementation Method 1
convection heating
Implementation Method 2
thermal control system configured to maintain a first temperature of the chip and a second temperature of the chip
Implementation Method 3
optical fluorescence imaging system configured to collect spatial information
Data Source
AI summary
The disclosure describes apparatus and methods for multiplexed amplification and detection of nucleic acid targets in a sample. Embodiments of the present disclosure include a mechanical system configured to provide loading, vertical positioning and clamping of a chip; a thermal control system configured to maintain distinct temperatures of the chip, and an optical fluorescence imaging system.