PCR Thermal Cycler Preheated Blocks for Precision
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Solution Overview
Problem
Current PCR thermal cycling methods face challenges with temperature control accuracy, efficiency, and speed, often resulting in temperature overshoot, undershoot, and prolonged settling times, which can degrade DNA samples and affect amplification accuracy.
Innovation Solution
A thermal cycler system utilizing a series of high thermal capacity, high thermal conductivity hot blocks that preheat to target temperatures and coordinate movement with the PCR vessel to achieve rapid and precise temperature equilibration through pre-biasing, minimizing overshoot and undershoot, and optimizing thermal mass ratios for efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional Peltier element heating/cooling systems are used for thermal cycling, then temperature control can be achieved, but temperature overshoot and undershoot occur, reducing accuracy
Solution Approach 1:
The system pre-heats or pre-cools the thermal blocks to temperatures close to the target temperatures before the PCR vessel arrives. This preliminary action allows the blocks to be ready to rapidly transfer heat to or from the vessel without causing temperature overshoot or undershoot, thereby improving both accuracy and reliability of temperature control.
Solution Approach 2:
The system dynamically adjusts the temperature of thermal blocks based on the expected arrival time of the PCR vessel and the specific PCR step requirements. By changing block temperatures in advance and coordinating with vessel movement, the system achieves precise temperature control at the vessel interface while maintaining stability.
2Productivity
If rapid thermal cycling is implemented to increase processing speed, then productivity improves, but temperature control precision deteriorates due to prolonged settling times
Solution Approach 1:
The system performs preliminary heating or cooling of thermal blocks before the PCR vessel reaches them. This pre-positioning of thermal energy allows for rapid temperature transitions without requiring prolonged settling times, thus maintaining both high processing speed and precise temperature control.
Solution Approach 2:
The thermal blocks act as intermediary thermal energy storage devices between the heating/cooling sources and the PCR vessel. By pre-charging these intermediaries with the required thermal energy, the system can rapidly transfer heat to the vessel without direct high-power heating/cooling that would cause temperature instability.
3Productivity
If multiple thermal blocks are used to process multiple samples simultaneously, then productivity increases, but device complexity increases
Solution Approach 1:
The system divides the thermal processing function into multiple independent thermal blocks, each capable of maintaining a different temperature. This segmentation allows parallel processing of multiple samples while keeping each block's control relatively simple, managing overall complexity through modular design.
Solution Approach 2:
Each thermal block is designed to be multi-functional, capable of serving different PCR temperature requirements (denaturation, annealing, extension) at different positions in the cycle. This universality reduces the need for specialized components for each function, managing complexity while enabling parallel processing.
4Reliability
If high thermal capacity blocks are used to reduce temperature fluctuations, then temperature stability improves, but heating and cooling speed decreases
Solution Approach 1:
The system pre-charges the thermal blocks with the required thermal energy before the PCR vessel arrives. This preliminary action allows high thermal capacity blocks to rapidly transfer heat without requiring long heating/cooling times, resolving the contradiction between stability and speed.
Solution Approach 2:
The system creates a local thermal gradient at the block-vessel interface by pre-heating or pre-cooling specific regions of the blocks. This localized thermal preparation allows rapid heat transfer to the vessel while the bulk of the block maintains thermal stability, achieving both speed and reliability.
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 enables rapid, accurate, and uniform heating and cooling of PCR samples, reducing DNA damage and increasing amplification efficiency, while also allowing for simultaneous processing of multiple samples and improved power efficiency.
Implementation Method 1
a series of high thermal capacity, high thermal conductivity hot blocks that preheat to target temperatures and coordinate movement with the PCR vessel to achieve rapid and precise temperature equilibration
Implementation Method 2
A thermal cycler system utilizing a series of high thermal capacity, high thermal conductivity hot blocks
Data Source
AI summary
A thermal cycling method and associated device is described. The method is for carrying out a polymerase chain reaction (PCR) process to amplify deoxyribonucleic acid (DNA), and the method includes: pre-heating a series of blocks to respective temperatures that correspond to different respective heating stages in a PCR process, in which each block of the series of blocks defines a respective heat transfer surface, in which the series of blocks define a sequence of positions along a path, with each position defined by a respective heat transfer surface of a respective block; and moving a PCR reaction vessel, which contains deoxyribonucleic acid (DNA) and PCR reagents, along the path into and out of each respective position in the sequence of positions according to a schedule, in which, at each respective position the PCR reaction vessel is in thermal contact with the respective heat transfer surface to equilibrate a temperature of the PCR reaction vessel to a target temperature that corresponds to a respective heating stage in the PCR process.