Active Droplet Generator with Capacitance Impedance Feedback
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Solution Overview
Problem
Current digital PCR technologies are hindered by high costs and complexity, making them inaccessible to general laboratories, and suffer from irregular droplet sizes due to air bubbles and environmental changes, lacking self-diagnosis capabilities.
Innovation Solution
A disposable digital PCR active droplet generating apparatus using a disposable microchannel upper plate and a permanently available multifunctional lower plate, coupled or separated by vacuum, employing capacitance impedance measurement for real-time droplet size control and self-diagnosis through integrated flow velocity sensing electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If passive droplet generating method is used, then apparatus cost is reduced, but droplet size uniformity deteriorates due to air bubbles and environmental changes
Solution Approach 1:
The patent replaces the passive mechanical droplet generation system with an active control system using flow velocity sensing electrodes that detect and measure fluid flow characteristics. This substitution enables real-time monitoring and adjustment of droplet formation, ensuring uniform droplet sizes while maintaining cost-effectiveness through the use of simple electrode structures rather than complex mechanical actuators.
Solution Approach 2:
The patent implements feedback control by using flow velocity sensing electrodes to detect variations in fluid flow during droplet generation. The detected signals provide real-time information about flow conditions, allowing the system to identify and correct deviations from optimal droplet formation, thereby maintaining consistent droplet sizes without requiring expensive active pumping systems.
2Manufacturing precision
If flow velocity sensor is used for active droplet generation, then droplet size control is improved, but contamination between biosamples occurs due to repeated use
Solution Approach 1:
The patent employs disposable microchannel plates that are discarded after a single use, eliminating the risk of contamination between different biosamples. The flow velocity sensing electrodes are integrated into these disposable components, ensuring that the sensing capability is maintained while preventing cross-contamination. This approach prioritizes sample integrity over component reusability.
Solution Approach 2:
The patent segments the droplet generation system into disposable microchannel plates containing integrated electrodes and reusable control electronics. This segmentation allows the portion that contacts biosamples to be discarded after single use, while the expensive control systems can be reused, thereby preventing contamination while maintaining droplet size control capability.
3Ease of manufacture
If lab-on-a-chip chip is reused, then cost is reduced, but contamination between biosamples occurs leading to analysis errors
Solution Approach 1:
The patent designates the microchannel plate as a disposable component that is discarded after single use, eliminating contamination risks associated with reuse. This disposable approach is coupled with integrated flow velocity sensing electrodes that provide real-time monitoring, ensuring accurate analysis results while maintaining cost-effectiveness through the simplicity of the disposable design.
4Device complexity
If passive droplet generating method is used, then apparatus complexity is reduced, but self-diagnosis capability is lost
Solution Approach 1:
The patent replaces complex mechanical monitoring systems with simple flow velocity sensing electrodes that passively detect flow characteristics through electrical measurements. This substitution maintains low apparatus complexity while enabling self-diagnosis capability, as the electrodes can detect anomalies in fluid flow that indicate problems with droplet generation without requiring additional sensors or complex diagnostic hardware.
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 apparatus enables quick and accurate droplet size measurement and control, reduces costs by using disposable components, and provides self-diagnosis capabilities, enhancing the reliability and accessibility of digital PCR technology.
Implementation Method 1
employing capacitance impedance measurement for real-time droplet size control
Implementation Method 2
coupled or separated by vacuum
Data Source
AI summary
Provided are an active droplet generating apparatus capable of controlling a droplet size, a method of controlling a droplet size using the same, and a self-diagnosis apparatus for diagnosing generation of a droplet, the active droplet generating apparatus including: a disposable microchannel upper plate; a multifunctional lower plate separated from the disposable microchannel upper plate and configured to be permanently used separately from the disposable microchannel upper plate; a functional polymeric film provided on a lower surface of the upper plate; a negative pressure forming means; and a flow velocity control device configured to adjust the droplet size to a desired size by receiving, by feedback, the voltage value measured by the droplet measuring electrode and controlling flow velocities of the oil and the sample, thereby controlling the droplet size in a feedback control manner by quickly and accurately measuring the droplet size using a capacitance impedance technique.