Microfluidic 3D Tissue Culture Chamber With Pressure-Gated Cell Seeding
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Solution Overview
Problem
Current methods for forming and culturing 3D cardiac strips are labor-intensive, costly, and inefficient, requiring large cell numbers and impractical pipetting techniques, with existing microfluidic devices leading to uneven tissue distribution and interference with mechanical behavior.
Innovation Solution
A microfluidic device with a cell culture unit featuring a flow inhibitor that controls the flow between the culture chamber and supply channel, allowing precise cell delivery and preventing extracellular distribution, combined with elastic support structures for tissue interaction and measurement capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional open-top molds are used for forming 3D cardiac strips, then cell seeding can be performed, but the process becomes impractical and unreliable when miniaturizing to microscale due to extremely small pipetting volumes (100 nanoliter) required
Solution Approach 1:
The patent transitions from traditional open-top mold configuration to a microfluidic channel-based configuration where cells are delivered through a channel and confined by channel walls. This dimensional change from open space to enclosed channel allows for automated liquid handling and eliminates the need for manual micropipetting into open molds, making the process scalable and reliable.
Solution Approach 2:
The microfluidic channel acts as an intermediary structure that facilitates cell delivery. Instead of directly pipetting cells into a mold chamber, the channel provides a controlled pathway for cell-laden hydrogel to flow through, enabling precise delivery without requiring direct manual manipulation of extremely small volumes.
2Extent of automation
If microfluidic channels are used to supply cells to culture chamber, then automated cell delivery is enabled, but cells become evenly distributed through the chamber and form interconnected tissue that interferes with mechanical behavior measurements
Solution Approach 1:
The culture chamber is segmented into distinct regions: a cell delivery zone where cells are supplied through the channel, and a culture zone where cells are intended to form discrete 3D structures. The channel configuration and flow dynamics are designed to deposit cells in a controlled manner rather than allowing uniform distribution throughout the entire chamber volume.
Solution Approach 2:
Different regions of the culture chamber are designed with different functions: the channel region facilitates automated cell delivery, while the culture region provides appropriate conditions for 3D tissue formation. The channel walls and chamber geometry create local conditions that guide cell deposition patterns, ensuring cells form discrete structures rather than interconnected networks.
3Productivity
If discrete 3D tissue structures are formed in separate culture chambers, then cross-contamination is minimized and high throughput is achieved, but the device complexity increases with multiple chambers and flow control mechanisms
Solution Approach 1:
The microfluidic device is designed with universal components that serve multiple functions: the channel system enables both cell delivery and hydrogel deposition; the culture chambers can be used for different cell types and different assay conditions; the flow control mechanisms manage multiple fluid streams (cells, hydrogel, culture medium) through a unified system. This multi-functionality reduces overall system complexity compared to having separate dedicated systems for each 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
Enables efficient and reliable culturing of 3D tissue structures, particularly cardiac strips, with high throughput and minimal cross-contamination, allowing for precise mechanical and electrophysiological property determination.
Implementation Method 1
a flow inhibitor which is operable to selectively provide a flow inhibiting state or a flow permitting state depending on a fluid pressure at the flow inhibitor
Implementation Method 2
The culture chamber is provided with at least two mutually spaced apart elastic support structures which extend in the culture chamber and which are configured for supporting a tissue structure formed in the culture chamber
Data Source
AI summary
Microfluidic device comprising at least one cell culture unit for forming, culturing, growing and/or maintaining a 3D tissue structure such as a 3D strip of cardiac tissue, wherein the at least one cell culture unit comprises: a respective culture chamber for culturing cells having a chamber outlet opening; and a cell supply channel arranged to guide a microfluidic flow of liquid holding cells between a channel inlet and a channel outlet, wherein the cell supply channel is provided with a flow inhibitor which is operable to selectively provide a flow inhibiting state or a flow permitting state depending on a fluid pressure at the flow inhibitor, wherein, in the flow inhibiting state, the flow inhibitor is configured to substantially inhibit liquid flow between the cell supply channel and the culture chamber, wherein, in the flow permitting state, the flow inhibitor is configured to permit such liquid flow such that the cell supply channel is in liquid communication with the culture chamber to supply the culture chamber with cells, wherein the culture chamber is provided with at least two mutually spaced apart elastic support structures which extend in the culture chamber and which are configured for elastically supporting a tissue formed in the culture chamber, in particular a cultured 3D tissue formed from the cells, wherein the elastic support structures are elastically deformable, in particular flexible, in particular to vary a mutual distance of said support structures under influence of a varying contraction force between said support structures.