Digital Microfluidic Droplet Control for Real-Time Cell Growth Sensing
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Solution Overview
Problem
Current systems for growing cells in droplets lack the ability to effectively measure and adjust droplet properties during cell growth, limiting the understanding and control of cell growth processes.
Innovation Solution
Digital microfluidic devices with electrodes, coatings, sensors, and controllers that allow for the translation and manipulation of droplets across locations, enabling real-time measurement and adjustment of droplet properties, such as cell count and viability, using sensors and reagents to maintain optimal growth conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current systems are used for growing cells in droplets, then cell growth can occur, but the ability to measure and adjust droplet properties is insufficient
Solution Approach 1:
The digital microfluidic device integrates multiple functions including cell culture, real-time sensing of droplet properties (pH, temperature, cell count, viability), and automated reagent dispensing into a single platform. The electrodes serve both for droplet manipulation and for creating sensing zones, while the same device can handle multiple cell types and growth conditions, thereby simultaneously improving measurement precision and adaptability.
Solution Approach 2:
The system continuously monitors droplet properties using sensors and uses this feedback information to automatically adjust droplet composition by dispensing reagents. This closed-loop control enables real-time optimization of cell growth conditions based on measured parameters such as pH, temperature, and cell viability, resolving the contradiction between measurement capability and adjustment capability.
2Reliability
If real-time monitoring of droplet properties is implemented, then control of cell growth processes is enhanced, but device complexity increases
Solution Approach 1:
The patent combines multiple sensing functions (pH, temperature, cell count, viability detection) and actuation functions (electrode-based droplet manipulation, reagent dispensing) into an integrated digital microfluidic device. By merging these functions into a single platform with shared components such as the microfluidic channels and control system, the device achieves reliable real-time monitoring and control while minimizing the increase in overall complexity compared to separate independent systems.
3Loss of information
If multiple measurements are performed over extended periods, then understanding of cell growth processes is improved, but time consumption increases
Solution Approach 1:
The system performs continuous or near-continuous monitoring of droplet properties throughout the cell growth process, taking measurements at multiple time points over extended periods without requiring manual intervention or stopping the experiment. This continuous action captures comprehensive cell growth data including temporal changes in pH, temperature, cell count, and viability, thereby minimizing information loss while the automated nature of the system ensures that measurement time does not significantly extend the actual cell growth duration.
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 real-time monitoring and adjustment of droplet properties, enhancing the understanding and control of cell growth processes, allowing for rapid screening of different cell types under varying conditions.
Implementation Method 1
The electrodes positioned on the base substrate and/or the top substrate are configured to translate a droplet positioned between the base substrate and the top substrate across a plurality of locations
Data Source
AI summary
The present disclosure generally relates to digital microfluidic devices and associated methods. Some digital microfluidic devices described herein may be particularly suitable for manipulating droplets suitable for hosting cell growth. For instance, some digital microfluidic devices may include one or more features that assists with measuring and/or adjusting a property of one or more droplets during cell growth. As another example, some digital microfluidic devices may include one or more features that assist with performing a time-series measurement of one or more properties of a population of cells growing in a droplet. Such digital microfluidic devices may advantageously allow cell growth conditions to be recorded and/or adjusted during cell growth, which may enhance understanding of how various parameters affect cell growth and/or control of cell growth based on such knowledge.