PCR Temperature Sensing With Heat-Capacity-Matched Thermal Medium
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Solution Overview
Problem
Conventional PCR apparatuses face challenges in accurately controlling thermal cycling due to temperature sensing inaccuracies caused by the separation of the temperature sensing element from the reagent, leading to non-linear temperature differences and poor precision in temperature control.
Innovation Solution
The apparatus incorporates a temperature detection module with a heat transfer medium and a temperature sensor, where the heat transfer medium has a heat capacity matching or closely approximating that of the reagent, allowing for accurate temperature sensing and compensation for temperature differences, ensuring precise thermal cycling control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the temperature sensing element is embedded in the thermal conductive structure separated from the reagent by the test tube, then the device structure is simplified, but the temperature measurement precision deteriorates due to non-linear temperature differences
Solution Approach 1:
The patent introduces a heat transfer medium as an intermediary substance that fills the test tube and makes direct contact with both the reagent and the temperature sensing element. This mediator eliminates the thermal isolation caused by the test tube wall, enabling accurate temperature sensing without requiring the sensor to be in direct contact with the reagent, thus resolving the contradiction between structural simplicity and measurement precision.
2Measurement precision
If the temperature sensing element is placed in direct contact with the reagent, then the temperature measurement precision is improved, but the device complexity increases due to additional components
Solution Approach 1:
The heat transfer medium serves multiple functions simultaneously: it acts as a thermal conductor to transfer heat from the reagent to the sensor, serves as a filling substance to occupy the test tube volume, and provides a stable thermal environment. This multi-functionality allows accurate temperature measurement without adding complex additional components, resolving the contradiction between precision improvement and device complexity.
3Measurement precision
If a heat transfer medium with matched heat capacity is introduced, then the temperature sensing accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent specifies that the heat transfer medium should have a heat capacity approximately equal to that of the reagent (0.8-1.2 times the reagent's heat capacity). By controlling this critical parameter, the system achieves accurate temperature sensing that reflects the reagent's actual temperature conditions, while the relatively simple implementation (using common substances like water or buffer solutions) prevents excessive increase in device complexity.
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 enables accurate temperature sensing and control of the reagent during PCR processes, improving the precision and reliability of thermal cycling, thereby enhancing the detection capabilities of the apparatus.
Implementation Method 1
The temperature detection module includes a heat transfer medium and a temperature sensor. The temperature sensor is disposed in the heat transfer medium and is configured to sense a temperature of the heat transfer medium.
Implementation Method 2
The temperature sensor is disposed in the heat transfer medium and is configured to sense a temperature of the heat transfer medium.
Data Source
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AI summary
A detection apparatus configured for PCR testing includes a carrier structure (110) and a temperature detection module. The carrier structure is configured to carry a test tube (52), and the test tube (52) is configured for containing a reagent (50, 54) and a specimen. The temperature detection module is disposed on the carrier structure (110) and includes a heat transfer medium (74, 64) and a temperature sensor (144A, 144B). The heat capacity of the heat transfer medium (74, 64) is approximately equal to a preset value, so as to match heat capacity of the reagent (54). The temperature sensor (144A, 144B) is configured to sense a temperature of the heat transfer medium (64). In addition, a method for detecting a temperature of the detection apparatus is also provided.