Microfluidic Device Direct Sample Heating via Electromagnetic Radiation
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Solution Overview
Problem
Current microfluidic devices face limitations in rapidly and efficiently heating and cooling samples for thermal gradient creation and measurement, particularly due to reliance on thermal diffusion and the need for embedded heating elements, which increases manufacturing complexity and costs, and restricts throughput and sample handling.
Innovation Solution
A microfluidic device utilizing electromagnetic radiation, such as IR LEDs or lasers, for direct and simultaneous heating of samples, allowing rapid temperature equilibration and controlled thermal gradients without the need for direct contact with the substrate, enabling disposable chip designs and high-throughput analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal diffusion and embedded heating elements are used for sample heating, then heating can be achieved, but manufacturing complexity and costs increase
Solution Approach 1:
The patent replaces the mechanical/thermal system of embedded heating elements with an optical system using electromagnetic radiation sources. The radiation sources are positioned to irradiate the sample directly or through the substrate, eliminating the need for complex embedded thermal elements and their associated manufacturing processes.
Solution Approach 2:
The heating function is extracted from the substrate structure itself. Instead of embedding heating elements within the substrate, the patent uses separate electromagnetic radiation sources that can be positioned adjacent to or above the substrate, allowing the substrate to remain simple and easy to manufacture.
2Temperature
If embedded heating elements are used for sample heating, then heating can be achieved, but throughput and sample handling are restricted
Solution Approach 1:
The patent replaces the slow thermal diffusion process with electromagnetic radiation heating, which can rapidly deliver energy to the sample. This substitution enables faster heating rates and improved throughput while allowing for better sample handling capabilities.
Solution Approach 2:
The patent employs pulsed or modulated electromagnetic radiation sources that can be rapidly switched on and off, enabling precise temporal control of heating. This periodic action allows for rapid thermal cycling and high-throughput experimentation.
3Measurement precision
If conventional cuvette-based fluorometers are used, then fluorescence measurement can be performed, but sample volume requirements are large
Solution Approach 1:
The patent transitions from conventional cuvette-based measurement to a planar microfluidic chip geometry. This dimensional change allows for extremely small sample volumes (nanoliter to picoliter scale) while maintaining adequate optical path lengths for fluorescence detection through the thin substrate.
Solution Approach 2:
The patent uses a thin substrate or film structure that allows electromagnetic radiation to pass through while containing the sample in a planar configuration. This thin-film approach enables small sample volumes while maintaining measurement capability.
4Speed
If conventional cuvette geometry is changed to increase heat-transfer surface-area to volume ratio, then thermal equilibration speed improves, but fluorescence signal is lost
Solution Approach 1:
The patent replaces thermal conduction heating with electromagnetic radiation heating, which directly deposits energy into the sample volume. This substitution achieves rapid thermal equilibration without requiring extreme surface-area-to-volume ratios that would compromise fluorescence signal strength.
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
Enables rapid and localized heating and cooling of samples, reducing manufacturing complexity and costs, while allowing for high-throughput analysis and precise thermal gradient creation, facilitating faster and more efficient measurement of thermal denaturation curves and dissociation constants.
Implementation Method 1
A microfluidic device utilizing electromagnetic radiation, such as IR LEDs or lasers, for direct and simultaneous heating of samples
Implementation Method 2
The analytical assembly is configured to record a change in the sample arising from an interaction of the sample with the first source of electromagnetic radiation
Data Source
AI summary
A microfluidic device, for analysis, comprising: a chip (1) comprising a cavity (3); a light emitting diode or a laser which emits a first electromagnetic radiation (4) for heating a sample placed in the cavity in use; and an analytical assembly (7) configured to record a change in the sample arising from an interaction of the sample with the first source of electromagnetic radiation.