PCR Well Heating Sheet for Rapid Thermal Cycling
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Solution Overview
Problem
Existing PCR testing devices face challenges in achieving rapid and accurate temperature control during thermal cycling due to thermal gaps and reliance on heat sinks, leading to decreased efficiency and accuracy in nucleic acid amplification.
Innovation Solution
A PCR well design that utilizes a heating sheet to directly apply heat in different temperature phases, coupled with a heat sink that maintains a lower temperature to enhance thermal control, allowing for precise and rapid transitions between phases, thereby reducing thermal lag and improving amplification efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a heat sink is used to maintain lower temperature during PCR thermal cycling, then temperature stability is improved, but thermal lag increases and response time slows down
Solution Approach 1:
The well structure is divided into multiple segments: a first well portion with a heating element for active heating, and a second well portion with a heat sink for active cooling. This segmentation allows simultaneous temperature control in different zones, enabling rapid transitions between temperature phases without thermal lag while maintaining stability during holding phases.
Solution Approach 2:
A partition wall is introduced as an intermediary structure between the heating element and the heat sink. This partition wall selectively allows heat transfer in controlled directions while preventing direct thermal coupling between the heating and cooling zones, enabling independent temperature control of each well portion during thermal cycling.
2Stability of the object's composition
If heating is applied to the entire well uniformly, then temperature distribution is improved, but thermal efficiency decreases due to energy waste in non-reaction zones
Solution Approach 1:
Instead of uniform heating, the patent applies heating locally only to the first well portion containing the reaction mixture. The heating element is positioned to heat only the necessary reaction zone, while the second well portion with the heat sink remains at lower temperature. This local quality approach eliminates energy waste in non-reaction zones while maintaining proper temperature distribution in the active reaction area.
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 faster and more accurate PCR testing by minimizing thermal lag, reducing the overall time required for thermal cycles, and enhancing the sensitivity and reliability of nucleic acid detection.
Implementation Method 1
a heating sheet to directly apply heat in different temperature phases
Implementation Method 2
a heat sink that maintains a lower temperature to enhance thermal control
Implementation Method 3
heat transfer from the heating sheet through the well wall to the PCR mixture
Data Source
AI summary
A device includes at least one well to receive a polymerase chain reaction (PCR) mixture and including an interior partially defined by a first wall comprising a heating first sheet. A control portion is to cause, via an electrical signal, the first sheet to generate heat in a thermal cycling zone within the interior in close thermal proximity to the first wall in different phases operating in sequence at a first temperature comprising at least about 90° Celsius, a second temperature comprising at least about 25° C. less than the first temperature, and a third temperature comprising at least about 5° C. greater than the second temperature and at least about 15° C. less than the first temperature.