Microfluidic Chip Heat Transfer Sealing Layer for Temperature Control
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Solution Overview
Problem
Existing microfluidic chips made of glass, PDMS, and plastic have low thermal conductivity, making them unsuitable for rapid and precise temperature control, which is essential for point-of-care diagnostic systems, especially in detecting infectious diseases like COVID-19, and existing solutions like electrical heating can be inefficient or interfere with sample analysis.
Innovation Solution
A microfluidic chip with a heat transfer sealing layer, supported by an active temperature control device, such as a thermoelectric heat pump or fluidic heat exchanger, that allows for precise temperature control through direct heat transmission, preventing sample leakage and enhancing mixing, and is integrated into the chip design for efficient manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional microfluidic chip materials (glass, PDMS, plastic) are used, then ease of manufacture is improved, but thermal conductivity deteriorates
Solution Approach 1:
The patent employs a composite structure combining a microfluidic chip made of traditional materials (glass, PDMS, or plastic) with an integrated heating element made of conductive material. This composite approach allows the chip to maintain ease of manufacture while the heating element provides the necessary thermal conductivity for precise temperature control.
Solution Approach 2:
The patent introduces a heating element as an intermediary component between the power source and the sample. This heating element acts as a thermal mediator, transferring heat efficiently to the sample through direct contact or proximity, thereby overcoming the low thermal conductivity of traditional chip materials without modifying the chip material itself.
2Temperature
If electrical heating is applied to microfluidic channels, then temperature control is improved, but sample integrity deteriorates
Solution Approach 1:
The heating element serves as a thermal intermediary that transfers heat to the sample without direct electrical contact. This mediator approach allows temperature control while avoiding the harmful effects of electrical fields on the sample, such as interference with flow or unintended chemical reactions.
Solution Approach 2:
The patent replaces direct electrical heating of the sample with a thermal conduction-based heating system. Instead of applying electrical energy directly to the sample (which causes interference), the system uses a conductive heating element that transfers thermal energy mechanically through conduction, thereby achieving temperature control without electrical interference.
3Ease of operation
If point-of-care diagnostic systems are made portable, then ease of operation is improved, but detection sensitivity deteriorates
Solution Approach 1:
The patent employs precise temperature control through integrated heating elements to optimize reaction conditions for pathogen detection. By maintaining exact temperature parameters, the system achieves high detection sensitivity in a portable format, as temperature-critical reactions (such as PCR or enzymatic reactions) can proceed with high efficiency even in compact devices.
Solution Approach 2:
The heating element enables continuous and stable temperature maintenance throughout the diagnostic process. This continuous thermal action ensures that sensitive detection reactions proceed consistently without temperature fluctuations, thereby maintaining high detection sensitivity even in the reduced environment of a portable point-of-care device.
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 precise temperature control of samples within the microfluidic channels, improving diagnostic efficiency and sensitivity, and allows for portable, cost-effective, and highly sensitive detection systems suitable for point-of-care diagnostics.
Implementation Method 1
an active temperature control device arranged to provide structural support to the heat transfer sealing layer and operable to control a temperature of the sample via transmission of heat through the heat transfer sealing layer
Implementation Method 2
with the active temperature control device being a thermoelectric heat pump
Implementation Method 3
with the active temperature control device being a fluidic heat exchanger
Data Source
AI summary
A microfluidic chip is disclosed herein. In a specific embodiment, the microfluidic chip comprises at least one microfluidic reservoir having a wall portion and a heat transfer sealing layer cooperating with the wall portion for receiving a sample to be tested. The heat transfer sealing layer is arranged to be contiguous with the sample to be tested. The microfluidic chip further comprises an active temperature control device arranged to provide structural support to the heat transfer sealing layer and operable to control a temperature of the sample via transmission of heat through the heat transfer sealing layer. A detection module is also disclosed.