Thermal Isolation of PCR Reaction Sites Using Segmented Pedestals
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Solution Overview
Problem
Existing PCR sample holders struggle to thermally isolate individual reaction sites without affecting adjacent samples, especially during demanding thermal protocols, leading to suboptimal DNA amplification due to heat transfer.
Innovation Solution
A thermal block assembly with pedestals and cooling blocks is used to thermally modulate and isolate reaction sites, minimizing heat flow between adjacent samples, and incorporating thermoelectric devices for precise temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a heated metal block is used to perform PCR on multiple samples, then thermal cycling can be achieved across samples, but heat is transferred to surrounding areas and adjacent samples, adversely affecting their amplification
Solution Approach 1:
The metal block is segmented into multiple independent heating zones, each corresponding to a specific sample well. This allows individual temperature control for each sample, preventing heat transfer from affecting adjacent samples while maintaining the ability to process multiple samples simultaneously.
Solution Approach 2:
Different regions of the metal block are assigned different thermal properties or temperature controls tailored to the specific requirements of each sample. This enables localized temperature optimization for each reaction while isolating thermal effects to prevent interference with neighboring samples.
2Quantity of substance
If samples are closely spaced to increase sample holder capacity, then more samples can be processed in parallel, but thermal isolation between reaction sites becomes difficult to maintain
Solution Approach 1:
The sample holder is designed with segmented thermal zones that correspond to individual sample positions. Even when samples are closely spaced, each zone maintains independent thermal control through the segmented structure of the metal block, allowing high sample density without sacrificing thermal isolation.
Solution Approach 2:
Thermal isolation is achieved by introducing vertical dimensionality through the metal block structure, which acts as a thermal barrier between closely spaced horizontal sample positions. This allows high sample density in the horizontal plane while maintaining thermal isolation through the vertical thermal resistance of the block material.
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 solution effectively reduces thermal interference between samples, allowing for precise temperature control and improved DNA amplification by maintaining optimal temperatures across reaction sites, reducing the impact of heat transfer and enhancing PCR efficiency.
Implementation Method 1
thermoelectric devices for precise temperature control
Implementation Method 2
feature to improve thermal isolation of the reaction sites
Implementation Method 3
minimizing heat flow between reaction sites
Data Source
AI summary
A thermal block assembly is provided. The assembly can comprise a substrate comprising a first surface configured with a plurality of reaction sites each reaction site configured to contain a biological sample and a sample block comprising a plurality of pedestals configured to thermally modulate the plurality of biological samples wherein each pedestal is thermally coupled to one of the reaction sites. The assembly can further comprise cooling blocks, slots and insulating rings associated with reaction sites each capable of minimizing heat flow between reaction sites. A method for thermally isolating reaction sites is also provided. The method can comprise providing a substrate including a plurality of reaction sites, each reaction site configured to contain a biological sample, providing a sample block comprising pedestals, each pedestal having a dimension substantially equal to a dimension of the reaction site and thermally coupled to the reaction site, thermally isolating the reaction sites with a thermal isolating feature, modulating the temperature of the pedestals through a sequence of temperature and hold times and cooling the reaction sites with cooling blocks.