Microfluidic Card Serpentine Channel for Rapid PCR Thermal Cycling
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Solution Overview
Problem
Conventional PCR technology has not kept pace with the need for higher throughput and speed, as it is limited by the time required for temperature-dependent steps in thermal cycling.
Innovation Solution
A microfluidic device with a heating assembly that forms differential temperature zones on a microfluidic card, allowing the reaction mixture to pass repeatedly through these zones via a serpentine channel array for rapid thermal cycling, enhancing PCR speed and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional PCR thermal cycling is used, then DNA amplification can be achieved, but the cycle time is too long and throughput is limited
Solution Approach 1:
The heating assembly is divided into multiple independent heating zones (first heating zone, second heating zone, third heating zone) that can be independently controlled to create distinct temperature zones. This segmentation allows simultaneous performance of different PCR steps (denaturation, annealing, extension) at different locations, enabling parallel processing and reducing overall cycle time while maintaining amplification efficiency
Solution Approach 2:
The invention transitions from conventional single-dimension thermal cycling (heating and cooling the entire reaction volume uniformly) to multi-dimensional temperature control with spatially distributed heating zones. The microfluidic card with serpentine channel allows the reaction mixture to flow through different temperature zones in sequence, creating a spatial dimension for thermal cycling that dramatically reduces cycle time while maintaining DNA amplification efficiency
2Speed
If rapid thermal cycling is implemented, then PCR speed increases, but temperature uniformity and amplification efficiency may deteriorate
Solution Approach 1:
Each heating zone is optimized for its specific function with localized temperature control. The first heating zone maintains higher temperature for denaturation, while the second and third zones are optimized for annealing and extension respectively. This local quality optimization ensures that each PCR step occurs at the ideal temperature, maintaining amplification efficiency even during rapid cycling
Solution Approach 2:
The serpentine channel design ensures continuous flow of the reaction mixture through all heating zones without dead volumes or stagnant regions. The microfluidic system maintains continuous thermal cycling action throughout the reaction mixture, eliminating idle time between cycles and ensuring that every portion of the sample undergoes complete thermal processing, thereby maintaining reliable amplification efficiency at high speeds
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 device achieves rapid PCR cycle times of less than 2 seconds per cycle, maintaining effective DNA amplification efficiency and temperature uniformity, thereby addressing the limitations of conventional PCR methods.
Implementation Method 1
the heating assembly provides differential heat to different sections of the card such that a plurality of different temperature zones are formed on the card
Implementation Method 2
The internal channel extends in a serpentine pattern to form a plurality of lateral sections that are oriented transverse to the longitudinal axis such that a fluid passing through the channel array passes through the lateral sections as it moves downstream of the inlet
Implementation Method 3
The device achieves rapid PCR cycle times of less than 2 seconds per cycle, maintaining effective DNA amplification efficiency and temperature uniformity
Data Source
AI summary
The present disclosure describes systems and devices capable of providing rapid polymerase chain reaction processes. A microfluidic card is insertable into a heating assembly. The heating assembly provides separate temperature zones to the card. The card includes a channel array that traverses repeatedly through the separate temperature zones so that a reaction mixture passing through the channel is subjected to thermal cycling.