Imaging-Guided Closed-Loop Control of Microfluidic Droplets
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Solution Overview
Problem
Existing methods for generating and processing biological materials, such as cells from biopsied or resected tissue, for treatment screening are inefficient and prone to errors, requiring manual intervention and extensive cleaning between samples.
Innovation Solution
A microfluidic apparatus and system for generating MicroOrganoSpheres (MOS) using a microfluidic chip with integrated droplet generation and polymerization channels, followed by demulsification into an aqueous suspension, enabling automated, high-throughput processing with disposable components to reduce downtime and ensure consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual methods are used for generating and processing biological materials, then flexibility and adaptability are maintained, but productivity is low and reliability is poor due to errors and cleaning requirements
Solution Approach 1:
The system is divided into separate functional modules: a microfluidic chip for droplet generation and polymerization, and a demulsification cartridge for separation. This segmentation allows each component to be optimized independently while working together to achieve automated high-throughput processing without requiring complex manual intervention
Solution Approach 2:
A hydrophobic membrane acts as an intermediary element in the demulsification cartridge, enabling selective separation of aqueous MOS suspensions from hydrophobic carrier fluid. This intermediary component automates the separation process and eliminates manual cleaning requirements between samples
2Reliability
If disposable microfluidic components are used, then reliability and consistency are improved, but device complexity and cost increase
Solution Approach 1:
The patent employs disposable microfluidic chips and demulsification cartridges that are discarded after single use. This eliminates cleaning requirements between samples, ensuring consistent results across multiple experiments while reducing contamination risks. The disposable nature simplifies the overall system operation despite increasing component complexity
Solution Approach 2:
The system is designed to discard used microfluidic components after they have served their purpose, and recover the valuable aqueous MOS suspensions through the demulsification cartridge. This approach ensures that the critical biological materials are preserved while the consumable microfluidic components are disposed of, maintaining reliability across multiple samples
3Productivity
If integrated microfluidic channels are used for droplet generation and polymerization, then productivity increases, but manufacturing precision requirements become more stringent
Solution Approach 1:
The microfluidic chip integrates droplet generation channels and polymerization channels into a single continuous flow path. This merging of functions allows automated high-throughput processing by eliminating transfer steps, while the channels are designed with standardized geometries that can be manufactured with conventional fabrication techniques
Solution Approach 2:
The system controls polymerization by changing parameters such as temperature or light exposure in the polymerization channel section, rather than requiring complex geometric variations. This allows maintained manufacturing precision while achieving high productivity through parameter-based process control
4Measurement precision
If hydrophobic membrane is used for demulsification, then separation efficiency is improved, but device complexity increases
Solution Approach 1:
A hydrophobic membrane is introduced as an intermediary element in the demulsification cartridge, enabling efficient separation of aqueous MOS suspensions from hydrophobic carrier fluid. The membrane's selective permeability provides high separation efficiency while its integration into the cartridge structure is straightforward, adding minimal complexity to the overall device
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 rapid, reliable generation and extraction of MicroOrganoSpheres from immiscible fluids with high recovery rates, facilitating patient-specific treatment screening without the need for cleaning between samples, and achieving consistent performance across multiple samples.
Implementation Method 1
a membrane disposed between the collection container and the surface of the substrate
Implementation Method 2
a first microfluidic channel is defined in a surface of the microfluidic chip, the first microfluidic channel including: a droplet generation portion including an inlet portion, a junction between the inlet portion and an emulsifying fluid channel
Implementation Method 3
a polymerization portion downstream of the droplet generation portion, the polymerization portion having a serpentine configuration
Data Source
AI summary
A method includes flowing a first fluid through a first channel of a microfluidic apparatus and flowing a second fluid through a second channel of the microfluidic apparatus. The first fluid comprises biological material and a matrix material and is immiscible with the second fluid. The first and second fluids are combined at a junction to form droplets of the first fluid dispersed in the second fluid in a third channel. Multiple exposures of a droplet in the third channel are captured in a single image, comprising: illuminating a region of the third channel with multiple successive illumination pulses during a single frame of the imaging device; identifying the droplet and determining a velocity or a size of the droplet based on an analysis of the captured exposures; and controlling the flow of the first fluid or second fluid to obtain droplets of a target size or velocity.