Microfluidic Thermocycler with Scanning Optical Detection
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Solution Overview
Problem
Current in vitro diagnostic analyses are bottlenecked due to the need for specialized, expensive equipment that is not available on-demand, leading to delayed processing times and the necessity to send samples to centralized facilities, which incurs costs and risks sample mishandling.
Innovation Solution
A system and method for simultaneous nucleic acid amplification and detection in multiple microfluidic reaction chambers using a detector head with photodetector and light source pairs, aligned in rows, and a microfluidic cartridge with independent reaction chambers, allowing for real-time PCR and optimized thermal cycling protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If specialized equipment is used for in vitro diagnostic analyses, then measurement precision and reliability are improved, but device complexity and cost increase, and availability decreases
Solution Approach 1:
The system divides the diagnostic function into separate modular components: a microfluidic cartridge containing reaction chambers for nucleic acid amplification, and a detector head with optical detection systems. This segmentation allows the complex detection function to be isolated in a dedicated module while the sample processing occurs in a simpler microfluidic cartridge, resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent introduces a microfluidic cartridge as an intermediary component that bridges sample preparation and detection. The cartridge contains all necessary reagents and reaction chambers, serving as a self-contained unit that interfaces with the detector head. This intermediary simplifies the overall system architecture while maintaining high detection precision through specialized optical detection
2Measurement precision
If centralized facilities are used for diagnostic analyses, then measurement precision is improved, but loss of time and loss of substance increase due to sample transport
Solution Approach 1:
The detector head is designed with multiple detector pairs that can simultaneously analyze multiple reaction chambers across different microfluidic cartridges. This multi-functional capability allows a single device to serve multiple diagnostic functions and process multiple samples concurrently, eliminating the need for centralized facilities while maintaining detection precision and reducing processing time
Solution Approach 2:
The system enables continuous processing of multiple samples through simultaneous thermocycling and optical detection in parallel reaction chambers. The synchronized operation of multiple detector pairs allows uninterrupted analysis across all chambers, eliminating idle time and reducing overall processing time compared to sequential centralized processing
3Device complexity
If multiple samples are processed sequentially, then device complexity is reduced, but productivity decreases
Solution Approach 1:
The patent transitions from sequential one-dimensional processing to parallel multi-dimensional processing by arranging multiple reaction chambers in a two-dimensional array within the microfluidic cartridge. The detector head scans across this array simultaneously analyzing multiple chambers, thereby increasing productivity while maintaining relatively simple device architecture through systematic spatial arrangement
4Productivity
If thermal cycling is performed in multiple reaction chambers, then productivity is improved, but uniformity of thermal contact becomes difficult to maintain
Solution Approach 1:
The system implements local thermal control by providing dedicated heating and cooling mechanisms for each reaction chamber or small groups of chambers. This allows each chamber to maintain optimal and uniform thermal conditions independently, ensuring consistent thermocycling performance across multiple chambers while enabling high productivity through parallel processing
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 high-throughput molecular diagnostic assays at the point of care, eliminating the need for centralized facilities and reducing processing time, while ensuring uniform thermal contact and efficient detection across multiple reaction chambers.
Implementation Method 1
a detector head comprising a plurality of photodetector and light source pairs
Implementation Method 2
a plurality of photodetector and light source pairs
Implementation Method 3
a heater substrate configured to heat the reaction chamber
Implementation Method 4
a Peltier device configured to cool the reaction chamber
Data Source
AI summary
Systems and methods for performing simultaneous nucleic acid amplification and detection. The systems and methods comprise methods for managing a plurality of protocols in conjunction with directing a sensor array across each of a plurality of reaction chambers. In certain embodiments, the protocols comprise thermocycling profiles and the methods may introduce offsets and duration extensions into the thermocycling profiles to achieve more efficient detection behavior.