Self-Contained Pouch PCR for Low-Concentration Pathogen Detection
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Solution Overview
Problem
Traditional microbiology techniques for diagnosing pathogens are time-consuming, and PCR-based methods face challenges with contamination, multiplex reactions, and the need for large sample volumes, especially when pathogen nucleic acid is at low concentration.
Innovation Solution
A self-contained, disposable plastic pouch system for nested PCR and immuno-PCR that minimizes contamination, allowing for simultaneous assay of multiple biological substances through flexible blisters and channels, with integrated cell lysis, nucleic acid preparation, and amplification zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional microbiology techniques are used for pathogen diagnosis, then diagnostic accuracy can be achieved, but the analysis time becomes excessively long (days or weeks)
Solution Approach 1:
The patent replaces traditional mechanical microbiology techniques with a PCR-based biological amplification system. The PCR method uses enzymatic reactions (Taq polymerase) to exponentially amplify pathogen nucleic acids, achieving rapid detection within hours rather than days, while maintaining diagnostic accuracy through specific primer-based target recognition
Solution Approach 2:
The patent implements preliminary concentration steps before PCR amplification, including immunomagnetic separation and nucleic acid extraction. These preliminary actions enrich the pathogen nucleic acid from low-concentration clinical samples, ensuring adequate template quantity for subsequent rapid amplification and detection
2Productivity
If PCR is used for rapid diagnosis of multiple pathogens, then diagnostic speed improves, but contamination risks increase
Solution Approach 1:
The patent divides the diagnostic process into separate modular steps: sample collection, nucleic acid extraction, PCR amplification, and detection. Each step is performed in separate tubes or wells with dedicated reagents, preventing cross-contamination between samples and reactions while maintaining rapid throughput
Solution Approach 2:
The patent employs disposable consumables including sterile collection tubes, single-use extraction reagents, and disposable PCR plates or wells. These single-use items eliminate the risk of carryover contamination between patients and reduce the need for extensive decontamination procedures, maintaining diagnostic speed
3Adaptability or versatility
If large panels of PCR assays are run for each possible causative organism, then diagnostic coverage improves, but the complexity and cost increase significantly
Solution Approach 1:
The patent employs a universal PCR platform that can detect multiple pathogens simultaneously using common reagents and protocols. By designing primers that target conserved regions of pathogen genomes and using multiplex PCR techniques, the system achieves broad pathogen coverage without requiring separate complex assay systems for each organism
Solution Approach 2:
The patent implements a tiered diagnostic approach where a broad-spectrum PCR panel is first applied to all samples. Only samples showing positive results or suspicious patterns proceed to more specific targeted assays, reducing the overall complexity by avoiding unnecessary testing of all possible pathogens in every case
4Reliability
If nested PCR is performed by dividing the assay into multiple secondary PCRs, then amplification robustness improves, but the handling complexity and contamination risk increase
Solution Approach 1:
The patent implements nested PCR where inner primers amplify a specific target region within the product generated by outer primers. This nested structure provides enhanced specificity and robustness by requiring two sequential amplification steps with different primer pairs, reducing false positives while maintaining operational simplicity through standardized protocols
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, sensitive, and robust analysis of multiple biological substances with reduced contamination risks, facilitating efficient nucleic acid amplification and detection in a closed system.
Implementation Method 1
In recent years, the polymerase chain reaction (PCR) has become a method of choice for rapid diagnosis of infectious agents
Implementation Method 2
the blisters comprise a flexible material, such that pressure provided on an individual blister collapses the blister, forcing the contents from the blister
Implementation Method 3
the first stage reaction zone is an antigen-binding zone for immuno-PCR, in which antigens present in the sample are recognized and associated with a particular nucleic acid segment
Data Source
AI summary
Devices, containers, and methods are provided for performing biological analysis in a closed environment. Illustrative biological analyses include nucleic acid amplification and detection and immuno-PCR.