PCR Thermal Control Apparatus with Segmented Reaction Vessels
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Solution Overview
Problem
Current systems for PCR fluorimetry face challenges in differentiating between complex and overlapping signals from multiple fluorophores, and in maintaining accurate temperature control and reducing condensation in reaction vessels, leading to inefficiencies and potential contamination.
Innovation Solution
The design of reaction vessels with a thermally conductive lower portion and a thermally insulating upper portion, along with a heated lid and conformal thermal barrier, allows for efficient temperature control and reduced condensation, while the array configuration and optical detector system enable simultaneous monitoring of optical signals from multiple vessels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a thermally conductive material is used for the entire reaction vessel, then temperature control accuracy is improved, but heat loss to the environment increases and condensation forms on the upper portion
Solution Approach 1:
The reaction vessel is divided into two distinct portions: a lower thermally conductive portion for efficient heat transfer from the heat mount, and an upper thermally insulating portion to reduce heat loss to the environment. This segmentation allows each portion to perform its specific thermal function optimally.
Solution Approach 2:
Different thermal properties are assigned to different locations of the reaction vessel. The lower portion has high thermal conductivity to ensure accurate temperature control at the reaction site, while the upper portion has low thermal conductivity to minimize heat loss and prevent condensation formation.
2Quantity of substance
If multiple fluorophores are used in the reaction mixture, then more information about nucleic acid concentration and sequence is obtained, but signal differentiation becomes more difficult
Solution Approach 1:
A conformal thermal barrier is introduced as an intermediary layer between the heated lid and the reaction vessel. This barrier provides uniform thermal contact and pressure distribution, ensuring consistent temperature control across the reaction mixture, which helps maintain stable fluorescence signals for accurate differentiation of multiple fluorophores.
3Object-affected harmful factors
If a heated lid is applied to reduce condensation, then condensation on the seal is reduced, but thermal contact with the reaction vessel may be insufficient
Solution Approach 1:
A conformal thermal barrier in the form of a flexible thin film is placed between the heated lid and the reaction vessel. This flexible film conformally contacts the upper portion of the vessel, ensuring both thermal transfer efficiency and uniform pressure distribution to prevent condensation on the seal.
4Productivity
If an array of reaction vessels is used for simultaneous monitoring, then productivity increases, but optical signal interference between adjacent vessels may occur
Solution Approach 1:
The optical detection system is designed to extract and detect specific fluorescence signals from each reaction vessel in the array while filtering out background interference. The system selectively detects emitted light from individual vessels, allowing simultaneous monitoring of multiple reactions without signal cross-contamination.
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 configuration enhances the accuracy of temperature control, reduces signal overlap issues, and minimizes contamination risks, improving the efficiency and reliability of PCR processes.
Implementation Method 1
a lower receptacle portion of a relatively thermally conductive material for receiving, in use, chemical and/or biochemical reactants
Implementation Method 2
an upper portion of a relatively thermally insulating material
Implementation Method 3
a heated lid to be applied over the external surface of the seal to heat the seal to thereby reduce condensation on the internal surface of the seal
Data Source
AI summary
An apparatus (40) for a PCR reaction includes an array (41) of reaction vessels (42) is mounted on a thermal mount (43). The thermal mount (43) is positioned on a on a heater/cooler (45), such as a Peltier module. The array (41) is covered by a sealing film (44), which is sealed to the upper rims (49) of the vessels (42) to keep the reagents and reaction products within each vessel (42). A heated lid (50) is used to heat the underside of the sealing film to reduce condensation thereon of reagents vaporized during the reaction. The reaction vessels (42) are formed of an upper, thermally insulating part (25) and a lower, thermally conducting part (21) so as to facilitate accurate temperature control within the vessels but so as to reduce the amount of thermal energy conducted from the heated lid to the vessels, which would reduce the accuracy of the temperature control. The heated lid (50) may include a conformal layer (51) on its lower surface to conform to any variations in the configuration of the upper rims (49) of the vessels (42). The apparatus may include a thermal barrier between the lower portion (21) of the reaction vessels (42) and the heated lid (50).