Modular Microfluidic Perfusion Using Hydrostatic Flow Control
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Solution Overview
Problem
Existing microfluidic systems face challenges in achieving sustained and steady fluid flow without external power sources, are space-consuming, and have limited throughput due to reliance on costly and cumbersome pumps, leading to inefficient drug screening and modeling of complex tissue environments.
Innovation Solution
A pumpless, tubeless, and miniaturized modular system using hydrostatic pressure to drive fluid flow, enabling long-term perfusion and adjustable flow rates through hydraulic resistors and customizable hydrogel compositions, allowing for high-throughput drug screening and simulation of heterogeneous tissue environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If external pumps are used to drive fluid flow in microfluidic systems, then fluid flow can be achieved, but the system becomes space-consuming and operationally complex
Solution Approach 1:
The patent removes external pumps and tubing from the microfluidic system, extracting the fluid drive mechanism into the device itself through hydrostatic pressure chambers positioned at different heights. This eliminates the need for external power sources and complex pump systems while maintaining controlled fluid flow through the hydrogel matrix.
Solution Approach 2:
The system uses its own structural components (hydrostatic pressure chambers positioned at different elevations) to generate the driving force for fluid flow. The height difference between chambers creates gravitational hydrostatic pressure that automatically drives perfusion without requiring external energy input or complex control systems.
2Duration of action of moving object
If external pumps are used to maintain sustained fluid flow, then continuous perfusion is achieved, but the system requires external power sources and becomes less portable
Solution Approach 1:
The hydrostatic pressure chambers are pre-positioned at different heights during device fabrication, establishing the gravitational potential energy gradient before operation begins. This preliminary structural configuration enables sustained perfusion over extended periods without requiring external power sources, as the height difference continuously drives fluid flow from the higher to lower chamber.
3Productivity
If traditional pump-based systems are used for drug screening, then fluid flow can be maintained, but throughput is limited and operational efficiency is reduced
Solution Approach 1:
The device is divided into multiple independent hydrostatic pressure chambers positioned at different heights, each capable of driving flow through separate microfluidic channels. This segmentation allows parallel processing of multiple samples or conditions simultaneously, increasing screening throughput while maintaining simple operation through passive gravitational flow control.
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 efficient, low-cost, and ergonomic fluid flow management in microfluidic devices, reducing operational complexity and space requirements, facilitating accurate drug screening and simulation of physiological fluid dynamics.
Implementation Method 1
the hopper wall is situated gravitationally higher than the funnel and the microfluidic device
Implementation Method 2
a positive hydrostatic pressure differential across the hydraulic resistor is established based on a gravitational head of the liquid within the internal volume
Implementation Method 3
The hydraulic resistor is a semipermeable membrane
Implementation Method 4
the hydraulic resistor includes a porous material or a microchannel
Implementation Method 5
a microfluidic device including an extracellular matrix (ECM) derived hydrogel, and defining a lumen therethrough
Data Source
AI summary
A system may include a liquid hopper including a hopper wall defining an internal volume, an inlet coupled to the hopper wall, a funnel coupled to the hopper wall and defining an outlet in fluid communication with the inlet, a hydraulic resistor mount coupled to the hopper wall between the inlet and the outlet, and a hydraulic resistor coupled to the membrane mount. A system may include a microfluidic device comprising an extracellular matrix (ECM) derived hydrogel, and defining a lumen therethrough fluidly coupled to the outlet of the liquid hopper, wherein when liquid flows from the outlet and subsequently into the lumen of the microfluidic device, the liquid is permitted to perfuse at least one of: i) the lumen and ii) a wall of the microfluidic device.