Microstructured Filtration Device for Bioreactor Cell Culture
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Solution Overview
Problem
Current filtration devices for bioreactors face challenges in efficiently mimicking filtration phenomena, such as glomerular filtration, due to narrow blood channels causing flow limitations and potential clogging, which complicates the development of artificial organs for treating liver and kidney disorders.
Innovation Solution
A filtration device with a membrane separating two chambers, featuring microstructures on the lower wall that form microchambers and microchannels, allowing for fluid circulation and cell culture, and a flexible membrane that prevents contact with the wall, enabling efficient filtration and cell protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If narrow channels are used to mimic blood vessels, then the structural accuracy of the filtration system is improved, but the fluid flow capacity deteriorates and channel clogging occurs
Solution Approach 1:
The invention divides the filtration system into multiple parallel channels instead of using a single narrow channel. This segmentation increases the total fluid flow capacity while maintaining the structural accuracy of individual channels, as each channel can be precisely manufactured to mimic blood vessel morphology while collectively handling larger blood flow volumes
Solution Approach 2:
The invention transitions from a two-dimensional channel structure to a three-dimensional network of channels with varying depths and orientations. This dimensional change allows blood to flow through multiple pathways at different levels, increasing overall flow capacity while maintaining the structural accuracy of each individual channel segment
2Manufacturing precision
If narrow channels are used to mimic blood vessels, then the structural accuracy of the filtration system is improved, but channel clogging problems worsen
Solution Approach 1:
The filtration system is segmented into multiple parallel channels, so that if one channel becomes clogged, blood flow can be redirected through other channels. This segmentation maintains the structural accuracy of each channel while significantly improving reliability by preventing complete system failure due to clogging
Solution Approach 2:
Different regions of the channel network are designed with locally optimized properties - some channels have larger diameters or different orientations in areas prone to clogging, while maintaining structural accuracy in regions critical for filtration. This local quality variation prevents clogging while preserving the overall structural fidelity to blood vessel architecture
3Productivity
If membrane is placed adjacent to both chambers, then the filtration efficiency is improved, but the complexity of device assembly worsens
Solution Approach 1:
The membrane structure is merged with the chamber architecture so that the same membrane component serves as both the filtration barrier between chambers and the structural element defining the chamber boundaries. This merging achieves high filtration efficiency while reducing assembly complexity by eliminating separate membrane installation steps
4Quantity of substance
If fluid circulation is implemented in culture chamber, then the nutrient supply is improved, but the mechanical stress on cells worsens
Solution Approach 1:
The culture chamber is segmented into zones with different flow characteristics - areas close to the membrane receive nutrients through diffusion from the filtration chamber, while other zones receive gentle fluid circulation. This segmentation ensures adequate nutrient supply to all cells while protecting them from excessive mechanical stress
Solution Approach 2:
The membrane acts as an intermediary that allows nutrient transfer from the filtration chamber to the culture chamber without requiring direct fluid circulation through the culture chamber. Nutrients diffuse through the membrane, providing nourishment to cells while avoiding the mechanical stress that would result from pumping fluid directly through the culture chamber
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 facilitates efficient filtration and cell culture by allowing nutrient supply without direct fluid circulation, protecting cells from mechanical stress and enabling the development of three-dimensional structures, thus overcoming previous limitations in mimicking filtration phenomena.
Implementation Method 1
a filtration device with a membrane separating two chambers... the membrane is located between the first chamber and the second chamber... enabling efficient filtration
Data Source
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AI summary
The invention relates to a filtration device (100), characterized in that it includes: a first block (101) having a cavity forming a first chamber (110) comprising a bottom wall (111) having a set of microstructures including micro-walls and micro-contacts, the set of microstructures defining micro-chambers and micro-channels on the bottom wall (111) of the culture chamber; a second block (102) having a cavity forming a second chamber (120); and a filtration membrane (130), the first block (101), the membrane (130), and the second block (102) being arranged such that the membrane (130) is located between the first chamber (110) and the second chamber (120), adjacent to each of the first and second chambers (110, 120); as well as a first opening and a second opening for enabling a first fluid to pass into the second chamber (120) which is separated from the first chamber (110) by the membrane (130).