Microfluidic Device With Auxiliary Channel For Spatial Patterning
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Solution Overview
Problem
Existing organ/organoid-on-a-chip technologies struggle to precisely deliver molecules to three-dimensional in vitro tissues within microfluidic systems in a spatiotemporally controllable manner, limiting their ability to achieve spatial patterning of organoids.
Innovation Solution
A microfluidic device with an auxiliary channel that increases hydraulic resistance, allowing for precise positioning of biological samples at a gradient window by slowing down the fluid flow, enabling spatial patterning without the need for additional size-specific structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional microfluidic systems are used to deliver molecules to organoids, then the system structure is simple, but the spatial patterning precision is insufficient
Solution Approach 1:
The microfluidic device is segmented into distinct functional regions: a loading channel for introducing organoids, an auxiliary channel with controlled hydraulic resistance for flow modulation, and a gradient window for molecular delivery. This segmentation enables precise spatial control of organoid positioning and molecule delivery without requiring complex overall system architecture.
Solution Approach 2:
The auxiliary channel is designed with specific local properties (hydraulic resistance) that differ from the loading channel. By controlling the hydraulic resistance in the auxiliary channel, the system achieves localized flow modulation that enables precise organoid positioning at the gradient window, improving spatial patterning precision without affecting the entire system.
2Manufacturing precision
If fluid flow speed is increased to improve productivity, then the throughput is improved, but the positioning precision of organoids deteriorates
Solution Approach 1:
The system dynamically controls fluid flow speed through the auxiliary channel with adjustable hydraulic resistance. During organoid loading, the hydraulic resistance is configured to slow flow and enable precise positioning. During molecule delivery, the flow can be adjusted to optimize diffusion and gradient formation, allowing the system to adapt flow conditions to different operational phases.
Solution Approach 2:
The hydraulic resistance parameter in the auxiliary channel is optimized to create a flow velocity gradient. By changing the hydraulic resistance parameter, the system achieves different flow speeds in different regions, enabling both precise organoid positioning (low velocity) and efficient molecule delivery (optimized velocity) without compromising either function.
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 device allows for precise positioning of organoids at a gradient window, enabling spatial patterning and symmetry-breaking events, thereby improving the accuracy of in vitro models for pre-clinical and clinical phases.
Implementation Method 1
at least one auxiliar channel extending from and in fluid communication with the loading channel, wherein the at least one auxiliary channel is so dimensioned such that a hydraulic resistance in the at least one auxiliary channel is higher than a hydraulic resistance in the loading channel
Implementation Method 2
precisely delivering molecules (e.g. drugs, morphogens, chemicals, etc.) to three-dimensional (3D) in vitro tissues within microfluidics systems in a spatiotemporally controllable way
Data Source
AI summary
The present disclosure relates to a microfluidic device comprising: a substrate; a culture chamber (130); a loading channel (170) in fluid communication with the culture chamber; at least one auxiliar channel (170-1, 5 170-2) extending from and in fluid communication with the loading channel, wherein the at least one auxiliary channel is so dimensioned such that a hydraulic resistance in the at least one auxiliary channel is higher than a hydraulic resistance in the loading channel; a test area (150) defined along the loading channel at a position between the loading channel and the at least one auxiliary channel; a first medium reservoir (110) in fluid communication with a first side of the test area; and a second medium reservoir (120) in fluid communication with a second side of the test area, the second side being different from the first side.