Optical Heating Reaction Vessel for Rapid PCR Thermal Cycling
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Solution Overview
Problem
Conventional bench-top thermal cyclers used for PCR and DNA sequencing are inefficient in thermal cycling, as they are slower than desired and unable to rapidly and uniformly change temperatures within reaction vessels.
Innovation Solution
A reaction vessel system with light absorbing layers on opposing interior-facing surfaces, heated by energy sources such as LEDs, which efficiently absorb and transfer light energy to the reaction chamber, allowing for rapid and uniform temperature control through dual-sided heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional metal heating blocks powered by Peltier elements are used for thermal cycling, then temperature control is achieved, but the thermal cycling speed is slower than desired
Solution Approach 1:
The patent replaces the mechanical contact-based heating system (metal heating block with Peltier elements) with an optical heating system using light sources and light-absorbing materials. This substitution eliminates the thermal mass and heat transfer limitations of metal blocks, enabling much faster heating rates while maintaining precise temperature control through optical energy delivery.
Solution Approach 2:
The invention changes the fundamental heating mechanism from conductive/convective thermal transfer through metal to direct optical energy absorption. By using light sources with specific wavelengths matched to light-absorbing materials in the reaction chamber, the system achieves rapid temperature changes without the thermal inertia constraints of conventional metal heating blocks.
2Speed
If conventional single-sided heating is used, then device complexity is reduced, but thermal uniformity and heating speed are insufficient
Solution Approach 1:
The patent transitions from single-sided heating to dual-sided heating by adding illumination from both the top and bottom of the reaction chamber. This dimensional expansion allows simultaneous heating of the entire reaction volume from multiple directions, dramatically improving heating speed and thermal uniformity while maintaining relatively simple device architecture through symmetric 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 configuration significantly enhances the speed and uniformity of thermal cycling, reducing thermal gradients and increasing the throughput of PCR processes by allowing faster heating and cooling of reaction vessels.
Implementation Method 1
a first light absorbing layer conforming to the first interior-facing surface of the housing; and a second light absorbing layer conforming to the second interior-facing surface of the housing
Implementation Method 2
the first and second light absorbing layers each comprise a metallic film formed on respective first and second interior-facing surfaces of the housing
Data Source
AI summary
Embodiments include a reaction vessel having a first reaction chamber filled with a first material; a first light absorbing region adhered to an interior-facing surface of the first reaction chamber; a second reaction chamber filled with a second material; a second light absorbing region adhered to an interior-facing surface of the second reaction chamber; a temperature sensor disposed within the second reaction chamber; and one or more energy sources configured to direct light at the first light absorbing region and the second light absorbing region. A processor may be employed to determine a first temperature of the first material from a second temperature of the second material measured by the temperature sensor. Methods of manufacturing such a reaction vessel are also disclosed.