Enclosed PCR Unit Preventing Cross-Contamination via Sealed Transfer
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Solution Overview
Problem
Conventional PCR techniques face significant challenges with contamination between laboratorial amplification products, leading to false positives, which complicates clinical applications and requires stringent separation protocols, limiting their applicability, especially in resource-limited settings.
Innovation Solution
A totally enclosed unit for rapid detection of nucleic acid amplification products using a test strip technique, where the reaction tube remains unopened after amplification, and the product is transferred to a test strip within a sealed environment for visual read-out, preventing cross-contamination and false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional PCR techniques are used with open-tube detection, then detection sensitivity is improved, but contamination between laboratorial amplification products occurs leading to false positives
Solution Approach 1:
The system is divided into separate functional modules: a sealed reaction chamber for amplification, a transfer mechanism, and a detection chamber. This segmentation allows the amplification product to be contained and transferred in a controlled manner, preventing contamination while maintaining detection sensitivity.
Solution Approach 2:
A sealed transfer mechanism acts as an intermediary between the reaction chamber and detection chamber. This intermediary allows the amplification product to be moved from the reaction chamber to the detection chamber without direct exposure to the external environment, thus preventing contamination during transfer.
2Reliability
If separate rooms and single-direction streams are implemented for sample treatment, amplification, and detection, then contamination is prevented, but device complexity and operational requirements increase
Solution Approach 1:
The invention merges multiple functions (sample treatment, amplification, and detection) into a single integrated enclosed device. The reaction chamber, transfer mechanism, and detection chamber are combined in one unit, eliminating the need for separate physical rooms while maintaining contamination prevention through internal sealing and controlled transfer.
Solution Approach 2:
The reaction chamber and transfer mechanisms utilize sealed membranes and flexible barriers to contain amplification products. These flexible sealing structures allow for controlled transfer of samples while maintaining isolation, preventing contamination without requiring complex facility separations.
3Reliability
If UNG-dUTP system is used to prevent contamination, then false positives are reduced, but reagent cost increases
Solution Approach 1:
The system converts the potential harm of amplification product contamination into a benefit by using the sealed transfer mechanism to contain and control the amplification product. The amplification product, which could cause false positives if released, is instead channeled through a controlled transfer path to the detection chamber, turning the contamination risk into a controlled detection process.
4Reliability
If Fluorescence Quantitive PCR is used for enclosed reaction and real-time detection, then contamination is eliminated, but instrument and reagent cost increase
Solution Approach 1:
The system employs disposable sealed reaction chambers and transfer mechanisms that are inexpensive compared to fluorescence detection instruments. These single-use components eliminate contamination risk through their sealed design while keeping costs low, making the technology accessible for resource-limited settings without requiring expensive fluorescence equipment.
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
This approach ensures contamination-free detection, enhances the reliability of PCR results, and simplifies the detection process, making it suitable for various fields, including clinical diagnosis and resource-limited settings, while reducing operational time and costs.
Implementation Method 1
a test strip for rapid detection of nucleic acids
Data Source
AI summary
The invention relates to a method for rapid detection of a target nucleic acid amplification product while preventing cross-contamination between target nucleic acid amplification products and avoiding false positives, comprising the steps of: a) leaving the reaction tube unopened after the amplification reaction is finished, so as to prevent the target nucleic acid amplification product from leaking out and resulting in contamination; b) placing the unopened reaction tube inside an enclosed unit, making the target nucleic acid amplification product be transferred to a test strip from the reaction tube in a physically enclosed environment; c) performing detection in a visual read-out manner, and determining the result; d) discarding the enclosed unit in a safety place as a whole without opening it after the detection. The invention also relates to a totally enclosed unit for detecting a target nucleic acid amplification product, and still relates to applications of the totally enclosed rapid detection unit in detection of infectious pathogens, food industry, agriculture, livestock husbandry, customs quarantine control, and determination of DNA.