Electrowetting Droplet Manipulation for Single Molecule Detection

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Solution Overview

Problem

Current microfluidic systems face challenges in efficiently processing and analyzing large numbers of analytes, particularly in achieving precise sample partitioning and detection of single molecules.

Innovation Solution

The development of a droplet manipulation device with electrowetting electrodes and nanofeatures, such as nanowells and nanoposts, that utilize electrowetting-mediated droplet operations to transport and partition samples, allowing for the detection of single molecules using molecular sensors integrated into the device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional microfluidic systems are used to process analytes, then basic fluid manipulation is achieved, but efficient processing and analysis of large numbers of analytes with precise sample partitioning is not achieved

Engineering Contradiction:

Improveprocessing efficiency of large numbers of analytesVSAvoiddetection precision of single molecules

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The system segments the sample into numerous individual droplets, each containing a small volume of the original sample. This segmentation enables parallel processing of many analytes simultaneously while maintaining the ability to detect single molecules in each droplet through isolated containment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention transitions from conventional two-dimensional microfluidic channels to a three-dimensional droplet-based system with electrowetting electrodes positioned at multiple levels (top and bottom substrates). This dimensional change enables more complex droplet manipulation and precise sample partitioning.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If electrowetting-mediated droplet operations are used to transport and partition samples, then efficient sample partitioning is achieved, but device complexity increases due to multiple electrowetting electrodes and nanofeatures

Engineering Contradiction:

Improvesample partitioning efficiencyVSAvoiddevice structure with multiple electrode layers and nanofeatures

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system merges multiple functions into integrated components: electrowetting electrodes serve both as actuation elements for droplet manipulation and as structural support for nanofeatures. The top and bottom electrode layers work together as a unified system for three-dimensional droplet control, reducing the need for separate mechanical components.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The nanofeatures (nanowells and nanoposts) automatically guide droplet behavior through their inherent surface properties, eliminating the need for complex external control mechanisms. The hydrophilic nanofeatures self-organize the droplet partitioning process by creating preferential wetting regions that direct sample distribution without additional actuation.

Inventive Principle:

Principle #25Self-service

3Measurement precision

If nanofeatures like nanowells and nanoposts are used to leave behind small-volume samples, then detection precision is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvesingle molecule detection capabilityVSAvoidnanofeature fabrication accuracy

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The system utilizes changes in surface energy parameters of the nanofeatures to achieve precise sample retention. By controlling the hydrophilicity of nanowells and nanoposts through surface treatment or material selection, the system can reliably trap small-volume samples without requiring extremely tight dimensional tolerances in nanofeature fabrication.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The nanofeatures act as intermediary structures between the electrowetting electrodes and the sample droplets. They mediate the interaction by providing a physical and chemical interface that guides droplet formation and retention, reducing the direct impact of manufacturing variations on sample handling precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 efficient sample partitioning and detection of single molecules, improving the analysis of biological samples by balancing electrowetting and hydrophilic forces to leave behind small-volume samples in nanofeatures, facilitating precise biochemical assays.

Implementation Method 1

electrowetting electrodes and nanofeatures, such as nanowells and nanoposts, that utilize electrowetting-mediated droplet operations to transport and partition samples

Methodology Applied

Scientific EffectElectrowetting: Electrowetting

Implementation Method 2

balancing electrowetting and hydrophilic forces to leave behind small-volume samples in nanofeatures

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Data Source

PatentUS20240165624A1Microfluidics systems, devices, and methods

Publication Date: 2024.05.23 PLENO INC

AI summary

A droplet manipulation device comprising, which may, for example, include (a) a first substrate having a first layer comprising a first array of electrowetting electrodes, and a second layer atop a region of the first layer comprising a second array of electrowetting electrodes; and (b) a second substrate separated from the first substrate forming a droplet operations gap between the first and second substrates.