Low Shear Microfluidic Device with Segmented Channels
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Solution Overview
Problem
Current experimental tools lack the ability to recreate the physiological mechanical microenvironment of the lung alveolar-capillary unit, which is essential for studying complex organ functions and drug screening, due to the inability to assemble multi-cellular and multi-tissue organ-like structures that mimic the dynamic mechanical forces present in living organs.
Innovation Solution
A microfluidic device with a top mesochannel and a bottom microchannel, where the height of the top channel is increased to create a reduced stress environment, allowing cells to form stratified or three-dimensional structures, and featuring a membrane that can simulate mechanical forces by stretching, retracting, or deforming to mimic physiological conditions such as breathing or peristalsis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cells are cultured in traditional microfluidic devices with small channel heights, then the device complexity is reduced and manufacturing is easier, but the cells cannot form stratified or three-dimensional tissue structures requiring low shear and overhead space
Solution Approach 1:
The device divides the central channel into two or more closely apposed parallel sub-channels (mesochannels and microchannels) separated by membranes, creating distinct environments with different height characteristics for different cell culture needs
Solution Approach 2:
The invention introduces vertical dimension variation by creating mesochannels with height significantly greater than traditional microchannels, providing the overhead space necessary for cells to form three-dimensional and stratified tissue structures
2Productivity
If cells are subjected to high shear stress in narrow channels, then fluid flow efficiency is improved, but cell differentiation and tissue structure formation are inhibited
Solution Approach 1:
The central channel is segmented into mesochannels for cell culture and microchannels for fluid delivery, allowing independent optimization of flow characteristics and cell environment
Solution Approach 2:
Different regions of the device provide different flow conditions: mesochannels provide low shear stress environments for cell differentiation while microchannels maintain efficient fluid flow, achieving local optimization of both requirements
3Measurement precision
If the channel height is increased to allow three-dimensional cell structures, then cell behavior study accuracy is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The device uses a modular structure with a central channel divided into parallel sub-channels separated by membranes, simplifying the construction of complex three-dimensional environments
Solution Approach 2:
The membrane-separated structure serves multiple functions: physical separation of fluid streams, support for cell growth surfaces, and creation of defined three-dimensional spaces, reducing overall device complexity
4Device complexity
If traditional microfluidic devices are used without flexible membranes, then device simplicity is maintained, but the ability to simulate physiological mechanical forces is lost
Solution Approach 1:
The membrane structure can dynamically deform, stretch, and retract in response to applied forces, enabling the device to simulate dynamic physiological mechanical environments rather than static conditions
Solution Approach 2:
A flexible membrane is introduced as a thin film structure that can transmit and simulate physiological mechanical forces while maintaining the structural integrity of the microfluidic 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
Enables the growth and differentiation of human cells into terminally differentiated forms, such as ciliated and mucous-secreting cells, and allows for the study of cell behavior under physiological mechanical forces, providing a versatile in vitro model for disease modeling, drug screening, and therapeutic agent development.
Implementation Method 1
a membrane that can simulate mechanical forces by stretching, retracting, or deforming to mimic physiological conditions such as breathing or peristalsis
Data Source
AI summary
Provided herein relates to systems and methods for producing and using a body having a central channel separated by one or more membranes. The membrane(s) are configured to divide the central channel into at least one mesochannel and at least one microchannel. The height of the mesochannel is substantially greater than the height of the microchannel. A gaseous fluid can be applied through the mesochannel while a liquid fluid flowing through the microchannel. The systems and methods described herein can be used for various applications, including, e.g., growth and differentiation of primary cells such as human lung cells, as well as any other cells requiring low shear and/also stratified structures, or simulation of a microenvironment in living tissues and/or organs (to model physiology or disease states, and/or to identify therapeutic agents and/or vaccines). The systems and methods can also permit co-culture with one or more different cell types.