Biochemical Reaction System Thermal Mount Adhesive Decoupling
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Solution Overview
Problem
Existing chemical and biochemical reaction systems, such as PCR, face challenges with precise temperature control and uniform light coupling due to the limitations of Peltier modules, which lead to mechanical and thermal issues during repetitive thermal cycling, affecting the accuracy and efficiency of reactions.
Innovation Solution
A system with a thermal mount and flexible adhesive layers that thermally and mechanically decouple the thermoelectric module from the heat sink, allowing for uniform thermal conductivity and reducing hot and cold spots, combined with optimized power management and optical fiber configurations for precise light detection and excitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If Peltier modules are used for thermal control in PCR systems, then temperature cycling capability is provided, but mechanical stress and thermal non-uniformities occur during repetitive thermal cycling
Solution Approach 1:
The thermal control system is segmented into multiple independent heating/cooling zones along the reaction vessel array. Each zone can be independently controlled to provide precise temperature profiles, reducing thermal gradients and non-uniformities across the entire array while maintaining reliable operation through distributed control
Solution Approach 2:
A thermal interface layer or compliant mounting structure is introduced between the Peltier module and the reaction vessel holder to mechanically decouple the rigid thermal connection. This intermediary absorbs mechanical stress from thermal expansion/contraction cycles while maintaining adequate thermal contact, thereby reducing mechanical fatigue and thermal non-uniformities
2Illumination intensity
If excitation light sources are used for fluorescent detection, then light emission is generated, but uniform light coupling to reaction vessels is not achieved
Solution Approach 1:
The excitation light source system is designed with spatially varying properties to match the specific requirements of each region of the reaction vessel array. This may include position-dependent light intensity, wavelength, or coupling geometry to ensure uniform excitation across all vessels despite variations in their positions and orientations
Solution Approach 2:
The light coupling problem is solved by introducing additional spatial dimensions or configurations to the excitation system. This may involve arranging light sources at multiple heights, angles, or positions above the reaction vessels to achieve uniform illumination through geometric optimization rather than relying on a single light source configuration
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 enhances the precision and reliability of temperature control and light measurement in biochemical reactions, reducing mechanical stress and thermal non-uniformities, thereby improving the accuracy and efficiency of processes like PCR.
Implementation Method 1
a thermoelectric module having a first, thermally conductive side in mechanical and thermal contact with the second surface of the thermal mount, and a second thermally conductive side opposed to the first thermally conductive side of the thermoelectric module
Implementation Method 2
the first layer and the second layer of the flexible adhesive comprise a respective layer of silicone adhesive having thermally conductive material dispersed therein
Implementation Method 3
both layers of the flexible adhesive being elastic to provide the 'give' to allow the thermal mount, the thermoelectric layer and the heat sink to bend during thermal cycling
Implementation Method 4
the flexible adhesive being thermally anisotropic whereby thermal energy preferentially spreads across the first and second thermally conductive sides of the thermoelectric module to thereby reduce hot and/or cold spots
Implementation Method 5
optimized power management and optical fiber configurations for precise light detection and excitation
Data Source
Figure 1
Figure 2
Figure 3~6
AI summary
A chemical and/or biochemical system (1) having at least one reaction vessel (3) in which chemical and/or biochemical reactions may take place, the temperature of the reaction vessels being cycled between at least a highest predetermined temperature and a lowest predetermined temperature, the system comprising a thermal mount (4) for receiving the reaction vessel (s), the thermal mount being thermally coupled to a first, thermally conductive side of a thermoelectric module (5), a second thermally conductive side of the thermoelectric module being thermally coupled to a heat sink (6) and being provided with a pair of electrical contacts (33) to which a pair of electrically conductive wires (34) is connected for coupling to a power source, characterized in that a flexible adhesive (31, 32) is provided between the first thermally conductive side of the thermoelectric module and the thermal mount and between the second thermally conductive side of the thermoelectric module and the heat sink, whereby the adhesive is relatively thermally insulating compared to the first and second thermally conductive sides of the thermoelectric module and forms the sole coupling, thermal or mechanical, between the thermoelectric module and the thermal mount and between the thermoelectric module and the heat sink.