PCR Tube with Plug Cap and Flat Bottom for Optical Clarity
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Solution Overview
Problem
Standard PCR tubes experience evaporation and condensation issues due to temperature differentials between the tube and cap, and their curved bottoms cause light artifacts that reduce the sensitivity and specificity of optical detection in thermal cyclers.
Innovation Solution
A PCR tube with a plug-style cap that descends into the tube, minimizing void volume and temperature differential, and a flat, optically-clear bottom to reduce reflections and refractions, enhancing heat transfer and optical clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard PCR tube with cap is used, then the tube structure is simple and easy to manufacture, but temperature differential between tube and cap causes evaporation and condensation
Solution Approach 1:
The cap and tube are merged into a single integrated structure where the cap is formed as an extension of the tube body. This eliminates the temperature differential between separate cap and tube components while maintaining structural simplicity and ease of manufacture.
Solution Approach 2:
The integrated cap-tube structure serves multiple functions: it provides sealing, heat transfer, and structural support simultaneously. The cap portion extends the thermal conduction path from the heat block through the tube walls to the reaction mixture, eliminating condensation while the integrated design keeps manufacturing simple.
2Measurement precision
If a curved bottom tube is used, then the tube structure is simple, but light reflections and refractions reduce optical detection sensitivity
Solution Approach 1:
Instead of using a curved bottom that causes light artifacts, the invention inverts the approach by using a flat bottom surface. This simple geometric change eliminates light reflections and refractions that reduce optical detection sensitivity, while the rest of the tube structure remains simple and easy to manufacture.
3Temperature
If void volume is maximized, then the tube provides adequate headspace for reactions, but temperature uniformity deteriorates
Solution Approach 1:
The invention changes the geometric parameters of the tube, specifically reducing the void volume and creating a more compact configuration. This increases the surface area to volume ratio, improving heat transfer efficiency and temperature uniformity throughout the reaction mixture while still providing adequate headspace for the reaction.
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 design minimizes evaporation and condensation, improves temperature uniformity, and enhances the sensitivity and specificity of optical detection in thermal cyclers by reducing light artifacts.
Implementation Method 1
a hollow tube of heat conducting synthetic plastics material
Implementation Method 2
The flat, optically-clear bottom minimizes reflections and refractions of the excitation and emission light
Implementation Method 3
The flat, optically-clear bottom minimizes reflections and refractions of the excitation and emission light
Implementation Method 4
minimizes evaporation and condensation of the biological fluid
Implementation Method 5
minimizes evaporation and condensation of the biological fluid
Data Source
AI summary
A reaction tube for use in performing the Polymerase Chain Reaction (PCR) in a thermal cycler, is provided herein such reaction tube includes a hollow tube of heat conducting synthetic plastics material having an open top and a flat bottom formed of an optically-clear material. Such reaction tube also includes a solid plug cap nesting within said hollow tube and to provide a minimized void volume within the hollow tube and to minimize evaporation and condensation of the biological fluid.