Systems and methods using external heater systems in microfluidic devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current microfluidic devices face challenges in achieving high reproducibility and uniformity in temperature control for nucleic acid melt analysis, leading to difficulties in distinguishing small changes in melt curves that could indicate mutations, due to non-uniform heating systems and limited throughput.
Innovation Solution
A microfluidic system with a heat spreader affixed to the device, utilizing external and embedded temperature sensors, and anisotropic thermally conductive materials for uniform temperature distribution, along with a cooling mechanism to maintain temperature uniformity and reduce heat losses, enabling precise control of temperature profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional heating systems are used in microfluidic devices, then device complexity is reduced, but temperature uniformity and reproducibility deteriorate
Solution Approach 1:
A heat spreader component is introduced as an intermediary between the heat source and the microfluidic channels. This heat spreader acts as a thermal mediator that receives heat from the heating element and distributes it uniformly across all channels, resolving the contradiction by adding a specific component rather than redesigning the entire heating system.
Solution Approach 2:
The heating system is designed with different thermal properties in different regions - the heat spreader has high thermal conductivity to distribute heat uniformly, while the channel walls have controlled thermal properties to maintain temperature stability. This local differentiation of thermal qualities enables precise temperature control without excessive complexity.
2Productivity
If rapid heating is used to reduce processing time, then productivity increases, but temperature control precision deteriorates
Solution Approach 1:
The heating system dynamically adjusts power delivery to different zones based on real-time temperature feedback from sensors. During rapid heating phases, higher power is applied to meet productivity requirements, while during stabilization phases, power is precisely modulated to maintain temperature control precision, thus resolving the contradiction between speed and precision.
Solution Approach 2:
Temperature sensors provide continuous feedback to the control system, enabling closed-loop temperature control. This feedback mechanism allows the system to achieve rapid heating when needed while automatically correcting any temperature deviations, thereby maintaining precision even during high-speed operation.
3Productivity
If multiple samples are processed simultaneously to increase throughput, then productivity increases, but temperature uniformity deteriorates
Solution Approach 1:
The heating system is segmented into multiple independently controllable heating zones, each serving specific channels. This segmentation allows the system to process multiple samples simultaneously while maintaining temperature uniformity within each zone, resolving the contradiction by dividing the heating control into manageable segments rather than treating all channels uniformly.
Solution Approach 2:
The heat spreader serves multiple functions simultaneously - it acts as a thermal conductor, a temperature equalizer, and a structural support for multiple channels. This multi-functionality enables the system to maintain temperature uniformity across all channels even when processing multiple samples in parallel, thus achieving both high throughput and temperature precision.
4Measurement precision
If external temperature sensors are used for measurement, then measurement precision improves, but heat loss to sensors increases
Solution Approach 1:
The external temperature sensor measures the temperature of the heat spreader rather than directly contacting the sample fluid. The heat spreader acts as an intermediary that provides an accurate temperature reading representative of the sample temperature without causing direct heat loss from the sample to the sensor, thus resolving the contradiction between measurement precision and energy loss.
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
The system achieves highly reproducible melt curves and improved genotyping by ensuring uniform temperature across all samples, reducing processing time and enhancing the accuracy of nucleic acid analysis.
Implementation Method 1
a heat spreader, wherein the heat spreader is affixed to the microfluidic device such that the reservoirs or channels disposed on the microfluidic device are in thermal communication with the heat spreader
Implementation Method 2
systems and methods for calibrating, and determining and controlling the temperature of external heater systems
Implementation Method 3
a cooling mechanism to maintain temperature uniformity and reduce heat losses
Data Source
AI summary
The present invention relates to methods and systems that result in high quality, reproducible, thermal melt analysis on a microfluidic platform. The present invention relates to methods and systems using thermal systems including heat spreading devices, including interconnection methods and materials developed to connect heat spreaders to microfluidic devices. The present invention also relates to methods and systems for controlling, measuring, and calibrating the thermal systems of the present invention.