Electrode Array Droplet Manipulation for Compact Sample Processing
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Solution Overview
Problem
Current sample processing systems face challenges in handling small sample volumes efficiently, often leading to clogging, cross-contamination, and requiring large equipment sizes, which limits compactness and throughput in automated processing.
Innovation Solution
A digital microfluidics system with an electrode array network and controlled electric fields enables manipulation of small sample volumes in a compact format, preventing cross-contamination and facilitating simultaneous processing of multiple samples through a substrate with insulating and conductive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If complex fluid delivery systems are used to manipulate multiple samples simultaneously, then throughput is improved, but reliability deteriorates due to clogging and cross-contamination
Solution Approach 1:
The system divides the sample processing into discrete digital droplets that are manipulated independently on an electrode array. Each droplet is a separate, isolated unit that can be moved, mixed, and processed without physical contact with other samples, eliminating cross-contamination while enabling parallel processing of multiple samples simultaneously
Solution Approach 2:
The patent replaces complex mechanical fluid delivery systems (pumps, valves, tubing) with an electrical field-based manipulation system. Electrodes generate electric fields to move and manipulate droplets directly, eliminating mechanical components that are prone to clogging and failure, thereby improving reliability while maintaining high throughput
2Quantity of substance
If large sample volumes are processed, then equipment size increases, but compactness deteriorates
Solution Approach 1:
The system changes the scale parameter from microliter to nanoliter volumes. By working with much smaller droplet volumes (nanoliters instead of microliters), the patent enables processing of adequate sample quantities while using significantly smaller equipment footprint, achieving compactness without sacrificing processing capability
Solution Approach 2:
The patent transitions from traditional three-dimensional bulk fluid handling to two-dimensional droplet manipulation on a planar electrode array surface. This dimensional change allows multiple droplets to be processed in parallel on a compact surface area, enabling high throughput in a small footprint by utilizing the two-dimensional space efficiently
3Reliability
If small sample volumes are processed, then cross-contamination risk decreases, but manufacturing precision requirements increase
Solution Approach 1:
The droplets themselves serve as the manipulation interface. The electric fields act directly on the charged droplets, which respond predictably to field gradients. This self-service mechanism where the sample (droplet) is both the object and the interface for manipulation reduces the need for high-precision mechanical positioning systems, as the electrical fields provide inherent control and stability
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 system allows for automated, compact, and efficient processing of nanoliter volumes of biological samples without cross-contamination, supporting diagnostic tests and other sample processing functions like magnetic separation and evaporation, enhancing throughput and reliability.
Implementation Method 1
an electrode array network (120) coupled to the substrate (110) and configured to provide a pattern of controlled electric fields for manipulation of the set of sample droplets
Implementation Method 2
configured to provide a pattern of controlled electric fields for manipulation of the set of sample droplets
Implementation Method 3
a first layer (130) in communication with the electrode array network (120), the first layer separating the electrode array network (120) from fluid of the set of sample droplets
Data Source
AI summary
A system and method for sample droplet processing, the system including a substrate, an electrode array network coupled to the substrate and configured to provide a pattern of controlled electric fields for manipulation of the set of sample droplets; a first layer in communication with the electrode array network, the first layer separating the electrode array network from fluid of the set of sample droplets; and a second layer opposing the first layer and displaced from the first layer to define a region wherein droplets of the set of sample droplets can reside. In some variations, the system can additionally include an electronics subsystem coupled to at least one of the substrate and the electrode array network, and a control module in communication with the electronics subsystem, wherein the control module generates and manipulates the pattern of controlled electric fields.