Micro-Inertial Pump PCR System for Compact Fluid Cycling
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Solution Overview
Problem
Current PCR microfluidic chips face challenges with external pumps that are bulky, non-scalable, and difficult to miniaturize, limiting the complexity and flexibility of PCR systems, and requiring additional time and energy for temperature cycling due to the need to heat and cool the entire thermal mass.
Innovation Solution
Integration of micro-inertial pumps within the PCR microchips enables programmable and flexible cycling protocols, fluid flow paths, and fluid flow rates, allowing for compact and scalable PCR systems with micro-inertial pumps fabricated using common microfabrication technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If external pumps are used in PCR microfluidic systems, then fluid pumping function is achieved, but system size increases and scalability is reduced
Solution Approach 1:
The patent integrates the pumping function directly into the microfluidic chip by incorporating deformable channels that can change their cross-sectional area. This merging of pumping functionality into the chip structure eliminates the need for separate external pumps, thereby reducing system size while maintaining fluid transport capability.
Solution Approach 2:
The deformable channels serve multiple functions: they act as both fluid transport pathways and active pumping elements. By making the channels themselves capable of deformation and volume change, the system achieves multi-functionality where the same structural element performs both conduit and pump roles, reducing overall device complexity.
2Productivity
If external pumps are used for fluid transport, then fluid flow is achieved, but time and energy for temperature cycling increases
Solution Approach 1:
The patent combines the pumping function with the temperature cycling process by using the same deformable channel structure for both fluid transport and thermal processing. This integration eliminates separate pumping steps and reduces the overall time required for temperature cycling, thereby improving productivity.
Solution Approach 2:
The deformable channels undergo periodic deformation to create pumping action that is synchronized with the temperature cycling protocol. This periodic action allows fluid to be moved through the chip in a rhythm that matches the thermal processing cycles, reducing total processing time and energy consumption.
3Adaptability or versatility
If micro-inertial pumps are integrated into microchips, then system scalability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the microfluidic chip into multiple segments or regions, each containing deformable channels that can be independently controlled. This segmentation allows for modular design and fabrication, where each segment can be manufactured using standard microfabrication techniques and then assembled, improving scalability while managing manufacturing complexity.
Solution Approach 2:
The patent utilizes changes in physical parameters (such as channel dimensions, material properties, or deformation幅度) to create a range of pump configurations from the same basic design. This allows the system to be scaled and adapted for different applications without requiring entirely new fabrication processes, thereby improving ease of manufacture while maintaining versatility.
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
This solution reduces the time and energy required for temperature cycling, enables parallel PCR processing, and increases the complexity and scalability of PCR systems by allowing for controlled and efficient fluid movement between temperature zones, enhancing DNA amplification efficiency.
Implementation Method 1
An inertial pump includes a fluid actuator integrated asymmetrically within its associated microfluidic channel. The fluid actuators are capable of selective activation to circulate fluid between the chambers in a controlled cycle.
Implementation Method 2
At a first, high-temperature range, denaturation occurs as the paired strands of the double-stranded sample DNA template separate into two individual strands
Implementation Method 3
At a second, low-temperature range, annealing of primers complementary to the region of the sample DNA template being targeted for amplification takes place
Implementation Method 4
At a third, mid-temperature range, extension of the complementary sequence from the primer occurs, during which the polymerase adheres to the primer and uses nucleotides to replicate each isolated sample DNA template strand
Data Source
AI summary
In one embodiment, a polymerase chain reaction (PCR) system includes a mixture chamber, a denature chamber, an annealing chamber, an extension chamber, and a product chamber, that are fluidically coupled to one another through a plurality of microfluidic channels. An inertial pump is associated with each microfluidic channel, and each inertial pump includes a fluid actuator integrated asymmetrically within its associated microfluidic channel. The fluid actuators are capable of selective activation to circulate fluid between the chambers in a controlled cycle.