Electrowetting Droplet Analysis for Uniform Particle Imaging
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Solution Overview
Problem
Existing technologies face challenges in dispersing and analyzing particles within droplets, where existing methods fail to ensure proper dispersion of particles within the droplets, leading to inconsistent and analysis of the droplets, where existing methods fail to ensure proper dispersion of particles within the droplets, leading to inconsistent and analysis of the droplets, leading to inconsistent and analysis of the droplets, where existing methods fail to ensure proper dispersion of particles within the droplets, leading to inconsistent and inaccurate imaging and analysis.
Innovation Solution
A cartridge with a set of electrodes is used to transport and manipulate droplets on a surface, ensuring even dispersion of particles, using electrical currents to control the droplet's path and immobilization at an optical read window, facilitating accurate imaging and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If particles are suspended in a droplet for assay testing, then the assay can be performed, but the particles may settle or clump leading to inconsistent dispersion and inaccurate imaging
Solution Approach 1:
The patent applies electrowetting on dielectric (EWOD) technology to dynamically control droplet movement and particle dispersion. By applying voltage to electrode patterns, the droplet is manipulated to move along defined paths, ensuring particles remain evenly dispersed throughout the droplet volume during transport and imaging operations, thereby preventing settling and clumping while maintaining assay accuracy
Solution Approach 2:
The patent replaces mechanical mixing or agitation systems with an electrical field-based EWOD system. Instead of using physical mechanisms to keep particles dispersed, voltage applied to the dielectric surface creates electrowetting forces that control droplet behavior and particle distribution, eliminating the need for mechanical intervention while improving dispersion consistency
2Loss of time
If a prepared droplet is held for too long prior to testing, then preparation time is sufficient, but particle homogeneity decreases due to settling and clumping
Solution Approach 1:
The patent implements continuous droplet manipulation using EWOD electrode patterns that actively maintain particle dispersion throughout the holding period. Rather than passive storage, the system continuously applies electrical fields to move the droplet along predefined paths, ensuring particles remain suspended and evenly distributed even during extended preparation times, thus eliminating the trade-off between preparation time and particle homogeneity
3Reliability
If particles clump or settle in the droplet, then the droplet structure remains intact, but imaging quality and analysis accuracy degrade
Solution Approach 1:
The patent uses dynamic EWOD control to maintain both droplet structural integrity and particle dispersion simultaneously. By precisely controlling voltage application to specific electrode regions, the system moves the droplet along defined paths while keeping particles evenly distributed, ensuring that the droplet remains structurally sound for imaging while particles stay suspended for accurate analysis
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 method ensures even dispersion of particles within droplets, improving imaging and analytical accuracy by preventing clumping and settling, thereby enhancing the consistency and precision of assay results.
Implementation Method 1
preconfigured cartridges that utilize a plurality of electrodes to transport individual droplets of a liquid on a surface of the cartridge along one or more paths defined by the plurality of electrodes
Implementation Method 2
a second surface for manipulating, by applying a second electrical current to the second set of electrodes of the cartridge, the droplet on the second surface of the cartridge
Data Source
AI summary
A method for analyzing a plurality of particles of a droplet on an optical read window of a cartridge is disclosed. The method includes: (i) transporting, by applying a first electrical current to a first set of electrodes of the cartridge, the droplet on a first surface of the cartridge, wherein the first set of electrodes is configured to transport the droplet on the first surface of the cartridge along a path; (ii) manipulating, by applying a second electrical current to a second set of electrodes of the cartridge, the droplet on a second surface of the cartridge, wherein the second surface comprises the optical read window, and wherein the second set of electrodes circumscribes the optical read window; and (iii) analyzing the droplet while the droplet is manipulated on the second surface of the cartridge.