Inductive Heating Thermocycler Platform for Rapid PCR Cycling
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Solution Overview
Problem
Existing thermocyclers for nucleic acid amplification reactions face challenges with slow cycling times and inadequate temperature control, as they often require inefficient heating methods that heat the entire device rather than just the reaction platform, leading to temperature differentials and reduced throughput.
Innovation Solution
A high-speed thermocycler using radio-frequency electromagnetic energy to inductively heat a rotatable platform, ensuring uniform and rapid heating of the entire platform, decoupling heating speed from rotation speed, and employing a thermocouple for precise temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heating methods are used to heat the reaction block, then the reaction mixture can be heated, but the heating is slow and the entire device becomes heated causing temperature differentials
Solution Approach 1:
The invention segments the heating function by introducing a susceptor layer that is selectively heated by the electromagnetic field, separating the heating target from the entire reaction block. This allows localized heating of only the reaction vessels containing the susceptor, preventing heat distribution to the entire block and eliminating temperature differentials.
Solution Approach 2:
The invention employs periodic electromagnetic field application at specific frequencies (e.g., 2.45 GHz microwave frequency) to rapidly heat the susceptor material. This periodic energy input enables fast heating cycles while maintaining precise temperature control, directly addressing the slow heating issue of conventional methods.
2Speed
If the entire reaction block is heated to speed up cycling, then heating speed increases, but temperature control accuracy decreases due to temperature differentials
Solution Approach 1:
The susceptor layer is placed locally within each reaction vessel rather than throughout the entire block. This local placement ensures that electromagnetic energy is converted to heat only where needed, achieving rapid heating speed while maintaining uniform temperature distribution in each reaction vessel independently.
Solution Approach 2:
The susceptor material acts as an intermediary that absorbs electromagnetic energy and converts it to thermal energy locally. This mediator enables fast heating by decoupling the heating mechanism from the block structure, allowing rapid temperature changes without creating temperature differentials across the block.
3Productivity
If conventional thermal blocks are used, then temperature control is simple, but the device is slow in cycling reactions and has limited throughput
Solution Approach 1:
The invention replaces the conventional mechanical/conductive heating system with an electromagnetic field-based heating system. This substitution enables rapid energy transfer to the reaction mixtures through the susceptor layer, dramatically reducing cycle times and increasing throughput while maintaining temperature control through electronic frequency modulation.
Solution Approach 2:
The invention changes the heating parameter from conventional thermal conduction to electromagnetic induction at specific frequencies. By adjusting the electromagnetic field frequency and power, the system can rapidly heat or cool reactions, enabling faster cycling and higher productivity while maintaining precise temperature control.
4Temperature
If multiple temperature controlled blocks are used with robotic arm, then temperature control is improved, but the device becomes physically large, complex, and expensive
Solution Approach 1:
The invention makes the electromagnetic field source universal by enabling it to heat multiple reaction vessels simultaneously through a single susceptor layer. This multi-functional approach replaces the need for multiple separate temperature-controlled blocks and robotic handling, simplifying the system while maintaining excellent temperature control across all reactions.
Solution Approach 2:
The invention merges the temperature control function for multiple reaction vessels into a single electromagnetic heating system. By combining all reaction vessels in one block with susceptor layers, the system achieves unified temperature control, eliminating the complexity of multiple blocks and robotic arms while improving throughput.
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 significantly reduces overall cycle times, improves temperature control accuracy, and increases energy efficiency by heating only the reaction platform, minimizing temperature differentials and allowing for precise temperature management during nucleic acid amplification reactions.
Implementation Method 1
a high-speed thermocycler using radio-frequency electromagnetic energy to inductively heat a rotatable platform
Implementation Method 2
using radio-frequency electromagnetic energy to inductively heat a rotatable platform
Implementation Method 3
employing a thermocouple for precise temperature control
Data Source
AI summary
The present invention provides a thermocycler comprising: a rotatable platform having a plurality of reaction wells or being adapted to receive a plurality of reaction containers, wherein the rotatable platform and/or the reaction wells are formed, at least in part, of a material which is adapted to be inductively heated by exposure to electromagnetic energy. An electromagnetic energy source is provided and is configured to direct electromagnetic energy at the rotatable platform, wherein the electromagnetic energy source surrounds a sufficient amount of the rotatable platform in order to heat the entire platform substantially simultaneously. In preferred embodiments, the electromagnetic energy source completely surrounds the rotatable platform. The invention further comprises a method of cycling a reaction mixture between predetermined temperatures utilising the novel thermocycler apparatus of the invention. The invention also comprises use of the novel thermocycler apparatus of the invention for conducting a nucleic acid amplification reaction such as the polymerase chain reaction (PCR) and the ligase chain reaction (LCR).