Microfluidic Thermal Pixel Array for Localized Temperature Control

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Solution Overview

Problem

Conventional microfluidic devices face limitations in temperature and localization control, particularly when fluctuating temperature gradients or high-speed temperature cycling are required, which hinders precise biological analysis and diagnostics.

Innovation Solution

A microfluidic apparatus featuring a thermoelectrically-activated pixel array with individually controllable thermal pixels, allowing for precise temperature control at localized spots within the microfluidic channel, utilizing thermoelectric devices that operate as miniaturized solid-state heat pumps for both heating and cooling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional temperature control methods are used in microfluidic devices, then the device structure remains simple, but the temperature control precision and localization capability are insufficient

Engineering Contradiction:

Improvetemperature control precisionVSAvoiddevice structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The heating element is divided into multiple independently controllable thermal pixels arranged in an array, where each pixel can be controlled separately to create localized temperature zones. This segmentation enables precise temperature control at different positions within the microfluidic channel while maintaining a relatively simple overall device structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the microfluidic channel can have different temperature characteristics through the thermal pixel array. Each thermal pixel provides localized temperature control, allowing specific areas to be heated or cooled independently according to the requirements of different biological assays or particle isolation processes.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If conventional heating methods are used, then the device is simple to manufacture, but the ability to create fluctuating temperature gradients and high-speed temperature cycling is limited

Engineering Contradiction:

Improvetemperature gradient control capabilityVSAvoiddevice manufacturing ease

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The thermal pixel array enables dynamic temperature control where each pixel can be independently adjusted in real-time. This allows the creation of fluctuating temperature gradients and high-speed temperature cycling by dynamically changing the activation state of different thermal pixels, providing adaptability for various biological analysis protocols.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system can implement periodic temperature cycling by alternately activating and deactivating thermal pixels in a controlled sequence. This periodic action enables high-speed temperature cycling necessary for certain biological assays while maintaining the ability to adjust the frequency and amplitude of temperature variations.

Inventive Principle:

Principle #19Periodic action

3Measurement precision

If localized temperature control is implemented using thermal pixel array, then precise temperature control and particle isolation are improved, but the device complexity increases

Engineering Contradiction:

Improveparticle isolation precisionVSAvoidthermal pixel array complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system replaces complex mechanical temperature control mechanisms with electronically controlled thermal pixels based on thermoelectric effects. This substitution allows precise temperature control and particle isolation through electrical signaling rather than mechanical adjustment, reducing the complexity of moving parts while maintaining high measurement precision.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 advanced laboratory testing and diagnostics by providing precise temperature control, enhancing the isolation and analysis of biological particles, and improving the accuracy of sero-diagnostic techniques, such as distinguishing between similar pathogens like Zika and Dengue viruses.

Implementation Method 1

Each thermal pixel within the array may be separately and individually controlled to heat or cool a respective localized spot within a microfluidic channel

Methodology Applied

Scientific EffectJoule Heating: Joule Heating

Implementation Method 2

utilizing thermoelectric devices that operate as miniaturized solid-state heat pumps for both heating and cooling

Methodology Applied

Scientific EffectPeltier Effect: Peltier Effect

Data Source

PatentUS11701653B2Microfluidic device with localized temperature control

Publication Date: 2023.07.18 JOHNS HOPKINS UNIVERSITY

AI summary

A microfluidic apparatus is provided that includes a thermoelectrically-activated pixel array, a microfluidic chip, and control circuitry. The pixel array may include a plurality of thermal pixels, with each thermal pixel including a thermoelectric device. The microfluidic chip may include a microfluidic channel disposed adjacent to the thermal pixels such that thermal energy generated by the thermal pixels is received by the microfluidic channel to form a localized spot within the microfluidic channel corresponding to each thermal pixel. The control circuitry may be electrically coupled to each of the thermal pixels and configured to control the thermal energy being generated by each thermal pixel to control a temperature at each localized spot within the microfluidic channel.