Microfluidic Aliquoting Chamber Using Capillary Sealing
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Solution Overview
Problem
Existing microfluidic systems face challenges in automated aliquoting of sample liquids, requiring manual pre-processing steps and inefficient compartment filling due to centrifugal force limitations, leading to low compartment density and potential liquid loss.
Innovation Solution
A microfluidic apparatus with an aliquoting structure connected to a network, utilizing capillary stabilization and density differences to achieve automated aliquoting, allowing capillary forces to align phase boundaries for efficient filling and sealing of cavities, using a sealing liquid to prevent unwanted liquid contact and minimize carryover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If centrifugal force is used for aliquoting, then automated aliquoting can be achieved, but compartment density is limited due to fluid channel requirements
Solution Approach 1:
The patent replaces the centrifugal force mechanism with a capillary force-based filling mechanism. The microfluidic channels are designed with specific capillary properties that enable automatic filling of compartments without requiring centrifugal acceleration, thereby eliminating the need for large-radius fluid channels and enabling higher compartment density in the planar direction.
Solution Approach 2:
The patent changes the physical parameters of the fluid channels, specifically reducing their radius to exploit capillary effects. By making the channels sufficiently narrow, the capillary pressure becomes sufficient to drive liquid filling without external centrifugal force, fundamentally changing the operating regime from centrifugal to capillary-driven flow.
2Ease of manufacture
If manual pre-processing steps are required, then sample preparation can be performed, but automation is reduced
Solution Approach 1:
The patent merges the sample preparation functions (lysis, extraction) and the aliquoting function into a single integrated microfluidic device. The microfluidic network includes dedicated channels and chambers for each processing step, allowing all operations to be performed automatically within one cartridge without manual intervention between steps.
Solution Approach 2:
The microfluidic device is designed as a multi-functional platform that can perform sample lysis, nucleic acid extraction, and aliquoting into multiple reaction chambers. This universal design allows a single device to handle complete sample preparation workflows that would otherwise require multiple separate instruments and manual transfers.
3Extent of automation
If centrifugal force is used for filling, then automated aliquoting is achieved, but liquid transfer efficiency is reduced
Solution Approach 1:
The patent substitutes centrifugal force with capillary forces for liquid transport. The capillary action in the microchannels provides gentle, continuous flow that minimizes turbulence and splashing, thereby reducing liquid loss and improving transfer efficiency from the sample chamber to the aliquot chambers.
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 automated, loss-free aliquoting with high transfer efficiency, supporting sensitive molecular diagnostic analyses by ensuring precise and rapid filling of small volumes without dead volumes, and allowing integrated temperature control and optical detection.
Implementation Method 1
capillary stabilization, and stabilization which is additionally or alternatively brought about by differences in density of the liquids used, of phase boundary interfaces when liquids are being transferred into the chamber comprising the aliquoting structure
Implementation Method 2
stabilization which is additionally or alternatively brought about by differences in density of the liquids used, of phase boundary interfaces when liquids are being transferred into the chamber comprising the aliquoting structure
Data Source
AI summary
A microfluidic device is for processing and aliquoting a sample liquid. The microfluidic device has a dividing chamber for receiving a starting volume of the sample liquid. The dividing chamber has a plurality of cavities for receiving sub-volumes of the sample liquid, the sub-volumes being usable for analytical reactions. The microfluidic device also has a microfluidic network for using the dividing chamber in a fluid-mechanical manner and at least one pump device for pumping fluids within the device. The at least one pump device and the microfluidic network are configured to pump the sample liquid, as a first phase, and a sealing liquid, as a second phase, through the microfluidic network and into the dividing chamber in order to seal the sub-volumes of the sample liquid in the cavities using the sealing liquid.