Multi-channel Optical Detection System for Multi-chamber Assays
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Solution Overview
Problem
Biological assays, particularly nucleic acid amplification and detection, require extensive sample preparation, which is time-consuming and cumbersome, limiting rapid detection of nucleic acid, genetic markers, or pathogenic microorganisms in various samples.
Innovation Solution
A multi-channel optical detection system and method that enables real-time optical detection of reaction products in multiple reaction chambers without the need for sample preparation or nucleic acid purification, using a disposable assay cartridge with optical detection reagents and a base unit with heating capabilities, allowing for simultaneous identification of multiple targets in fluid samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If extensive sample preparation and nucleic acid extraction procedures are used, then detection accuracy is improved, but detection time and process complexity increase significantly
Solution Approach 1:
The invention extracts and isolates the essential detection function from the complex sample preparation process. By using whole-cell lysates directly in LAMP reactions without requiring nucleic acid extraction, the system separates the detection capability from the preparatory steps, achieving rapid detection while maintaining accuracy through optimized reaction conditions and multiple gene target amplification
Solution Approach 2:
The system performs preliminary cell lysis and nucleic acid release actions before the actual detection step. By pre-processing samples through simple heating or chemical lysis to release nucleic acids from cells, the invention eliminates the need for subsequent extraction and purification steps, enabling direct amplification and detection while maintaining detection accuracy
2Reliability
If multiple separate devices are used for sample preparation, amplification, and detection, then each function can be optimized, but device complexity and operational steps increase
Solution Approach 1:
The invention merges sample processing, nucleic acid amplification, and optical detection functions into a single integrated microfluidic device. The chip contains multiple reaction chambers that can simultaneously perform different LAMP amplifications and detections, eliminating the need for separate devices for each step while maintaining functional optimization through dedicated chamber designs and reagent integration
Solution Approach 2:
The microfluidic chip is designed with multi-functionality to perform various nucleic acid amplification reactions (LAMP, RT-LAMP) and detection modes (fluorescence, colorimetric) within a single device. The system can detect multiple gene targets simultaneously using different primers and dyes, providing universal detection capability for different pathogens and genetic markers without requiring device changes
3Measurement precision
If nucleic acid purification/isolation steps are included, then false positives are reduced, but processing time and equipment requirements increase
Solution Approach 1:
The system uses self-service mechanisms to achieve purification-like results without external equipment. By incorporating magnetic beads or affinity-based capture particles directly into the reaction mixture, the nucleic acids are selectively captured and concentrated on-site, enabling specific detection without requiring external centrifuges or purification kits, thus maintaining operational simplicity
4Loss of information
If multiple gene targets are detected simultaneously, then diagnostic information is improved, but reaction complexity and reagent requirements increase
Solution Approach 1:
The invention segments the detection process into multiple independent reaction chambers within the same device, each optimized for detecting specific gene targets. By physically separating different amplification reactions while maintaining device integration, the system can detect multiple pathogens or genetic markers simultaneously without cross-contamination, preserving diagnostic information while managing reaction complexity through modular chamber design
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
Facilitates rapid and efficient detection of genetic markers and pathogens by eliminating the need for sample preparation, enabling point-of-care or in-field identification of biological organisms through fluorescence or colorimetric detection within a shorter timeframe.
Implementation Method 1
a base unit having a cartridge-loading section adapted to receive the cartridge; and an optical detection unit
Implementation Method 2
a plurality of light sources each optically connected to a corresponding one of the detection channels to transmit an interrogating light beam out through the corresponding interrogation port
Implementation Method 3
enabling point-of-care or in-field identification of biological organisms through fluorescence or colorimetric detection
Implementation Method 4
colorimetric detection of positive LAMP reactions using Hydroxynaphthol blue dye (HNB)
Data Source
AI summary
A multi-channel optical detection system includes a base unit adapted to receive a multi-chamber assay cartridge having a plurality of reaction chambers loaded with a sample and an optical detection reagent, and an optical detection unit having a multi-channel optical block having a plurality of detection channels each with an associated light source, and an optic sensor. The optical detection unit is connectable to the base unit so that interrogation ports of the detection channels are optically aligned with optically transparent windows of the reaction chambers of a loaded cartridge, so that upon initialization, light sources are activated to interrogate reaction products in the reaction chambers and detect the optical responses therefrom.