Segmented Reservoir Electrodes for Consistent Microfluidic Dispensing
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Solution Overview
Problem
Existing digital microfluidic devices face challenges in accurately and consistently dispensing fluid droplets from reservoirs, particularly as the volume of fluid decreases, leading to inconsistencies and waste due to manual intervention.
Innovation Solution
A system with a plurality of reservoir electrodes, including a first reservoir electrode, a reservoir outlet electrode, and intermediate electrodes, generates electrical actuation forces to dispense droplets, allowing for consistent dispensing by adjusting electrode arrangements based on fluid volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single reservoir electrode is used to dispense droplets, then the device structure is simple, but dispensing consistency deteriorates as fluid volume decreases
Solution Approach 1:
The single reservoir electrode is divided into multiple segmented electrodes (first reservoir electrode, second reservoir electrode, third reservoir electrode) arranged along the fluid dispensing path. This segmentation allows independent control of different electrode segments, enabling consistent electrical actuation forces to be maintained as fluid volume decreases, thereby resolving the contradiction between structural simplicity and dispensing consistency.
Solution Approach 2:
The patent implements dynamic electrode activation where different combinations of reservoir electrodes are activated based on the current fluid volume. As fluid is dispensed and volume decreases, the system dynamically adjusts which electrodes are active to maintain optimal dispensing performance throughout the entire fluid depletion process, transforming the static single-electrode design into a dynamic multi-electrode system.
2Loss of substance
If manual intervention is used to empty the reservoir, then complete fluid dispensing is achieved, but productivity decreases due to additional operations
Solution Approach 1:
The multi-electrode reservoir system enables self-service complete fluid dispensing through automated electrical actuation. The segmented electrodes can be sequentially or simultaneously activated to propel remaining fluid droplets out of the reservoir without manual intervention, allowing the system to automatically empty itself while maintaining high productivity and eliminating fluid waste.
Solution Approach 2:
The patent ensures continuous useful action by maintaining electrical actuation capability throughout the entire fluid dispensing process until complete reservoir emptying. The multiple electrodes enable sustained fluid propulsion and droplet formation even as fluid volume becomes minimal, eliminating the need to stop for manual intervention and ensuring continuous productive operation.
3Reliability
If electrode surface area is increased to improve droplet dispensing, then dispensing reliability improves, but device complexity increases
Solution Approach 1:
Instead of using a single large-area electrode that would increase device complexity, the patent segments the electrode function into multiple smaller electrodes (first, second, and third reservoir electrodes) with progressively decreasing surface areas. This segmentation achieves reliable droplet dispensing through coordinated activation of multiple electrodes while maintaining a compact overall structure, resolving the contradiction between dispensing reliability and device complexity.
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
Ensures reliable and complete dispensing of fluid droplets, maintaining consistency regardless of fluid volume, reducing waste, and improving the efficiency of fluid handling in digital microfluidic systems.
Implementation Method 1
The at least one device electrode and at least one of the plurality of reservoir electrodes are configured to generate electrical actuation forces to dispense at least one droplet from the reservoir through the outlet to the at least one device electrode
Data Source
AI summary
System for storing and dispensing liquid in a digital microfluidic chip includes a plurality of reservoir electrodes defining a reservoir having an outlet and a first end opposite the outlet, the reservoir configured to be in fluidic communication with at least one device electrode proximate the outlet, the at least one device electrode and at least one of the plurality of reservoir electrodes configured to generate electrical actuation forces to dispense at least one droplet from the reservoir through the outlet. The plurality of reservoir electrodes include a first reservoir electrode proximate the first end, a reservoir outlet electrode proximate the outlet, and at least one intermediate reservoir electrode disposed between the first electrode and the reservoir outlet electrode. The first reservoir electrode, the reservoir outlet electrode, and the at least one intermediate reservoir electrode each has an electrode surface area in plan view greater than or equal to an electrode surface area of each of the at least one device electrodes.