Microfluidic Loop Layout for Larger Sample Volume and Thermal Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Microfluidic devices face challenges in scaling up to accommodate larger sample volumes without proportionally increasing the amount of silicon used in their construction, which is costly, and struggle to maintain uniform temperature control during DNA amplification processes.
Innovation Solution
The design incorporates microfluidic loops and channels located outside the silicon chip boundary, with fluid actuators and heaters to increase fluid volume by 2 to 20 times without increasing silicon usage, ensuring uniform temperature control within 4°C variation through pumping and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If microfluidic devices are scaled up to accommodate larger sample volumes, then the sample volume capacity increases, but the amount of silicon used increases proportionally, leading to increased costs
Solution Approach 1:
The patent extends microfluidic channels outside the traditional silicon chip boundary into a separate support structure. This dimensional extension allows the fluid pathways to continue beyond the expensive silicon substrate, enabling larger sample volumes to be accommodated in the external portion while minimizing silicon consumption to only the essential control and actuation regions.
Solution Approach 2:
The device is divided into two distinct segments: a silicon chip portion containing fluid actuators and control elements, and an external support structure portion containing the extended microfluidic channels. This segmentation allows the expensive silicon material to be used only where functionally necessary, while the bulk of the fluid handling infrastructure is provided by a lower-cost external structure.
2Weight of stationary object
If the microfluidic device uses a compact design within the silicon chip boundary, then silicon usage is minimized, but temperature uniformity during DNA amplification deteriorates
Solution Approach 1:
By extending channels outside the silicon chip boundary into a support structure, the patent creates additional thermal management space. This external portion can incorporate thermal insulation, heat sinks, or temperature control elements that would be difficult to integrate within the constrained silicon chip area, thereby improving temperature uniformity without increasing silicon usage.
3Temperature
If fluid volume is increased to improve mixing and heat transfer, then temperature control improves, but the device size and silicon usage increase
Solution Approach 1:
The patent resolves this contradiction by placing the expanded fluid volume in external channels rather than within the silicon chip. The extended microfluidic pathways in the support structure provide increased fluid volume for improved mixing and heat transfer, while the silicon chip itself maintains its compact size with minimal material usage.
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 approach allows for efficient DNA amplification techniques like PCR and LAMP by maintaining temperature uniformity and increasing sample volume without escalating silicon costs, enhancing mixing and heat transfer while reducing material usage.
Implementation Method 1
A heater can be located within the silicon-free substrate
Implementation Method 2
A first fluid actuator can be on the silicon chip and associated with a fluid driving end of the first microfluidic loop to circulate fluid through the first microfluidic loop
Implementation Method 3
ensuring uniform temperature control within 4°C variation through pumping and insulation
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
The present disclosure is drawn to microfluidic devices. In one example, a microfluidic device can include a driver chip and a fluid chamber located over the driver chip. First and second microfluidic loops can have fluid driving ends and fluid outlet ends connected to the fluid chamber. The first and second microfluidic loops can include a portion thereof located outside a boundary of the driver chip. A first fluid actuator can be on the driver chip associated with the fluid driving end of the first microfluidic loop to circulate fluid through the first microfluidic loop. A second fluid actuator can be on the driver chip associated with the fluid driving end of the second microfluidic loop to circulate fluid through the second microfluidic loop.