Large Microfluidic Bioreactor via Photopolymer Replica Molding
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Solution Overview
Problem
Conventional microfluidic bioreactors are limited in size, requiring expensive clean room facilities and lithography techniques, which restrict their accessibility and resolution, and alternative methods without lithography are either costly or lack the necessary resolution.
Innovation Solution
A novel method for manufacturing large-scale microfluidic bioreactors using a photopolymeric printing plate mold, allowing for centimeter-scale microfluidic channels and optimizing parameters like flow velocity and aeration for effective cellular growth, without the need for clean room facilities or expensive equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lithography techniques with silicon wafers are used, then high resolution microstructures can be achieved, but the manufacturing cost increases and clean room facilities are required
Solution Approach 1:
The patent uses a master mold created through lithography to produce multiple replicas via replica molding. The master mold is fabricated with high precision using conventional lithography, but subsequent replicas are made through a simpler molding process that does not require clean room facilities, thus transferring the high resolution requirement only to the initial mold creation while simplifying subsequent manufacturing
Solution Approach 2:
The manufacturing process is divided into two stages: (1) creating a master mold with high precision lithography in a clean room, and (2) producing multiple replicas through replica molding without clean room requirements. This segmentation allows the complex high-precision step to be performed once, while subsequent production can be done in simpler facilities
2Manufacturing precision
If silicon wafers are used as substrates, then high resolution photoresist patterns can be achieved, but the substrates are fragile and have limited size
Solution Approach 1:
The patent changes the substrate material from fragile silicon wafers to durable materials such as glass, metal, or plastic that can withstand repeated molding cycles. This parameter change maintains the ability to achieve high resolution patterns while significantly improving the mechanical strength and reusability of the substrate
Solution Approach 2:
Instead of directly using the fragile silicon wafer for the final device, the patent creates a replica mold from it. The replica mold can be made from durable materials that are not prone to breakage, thus preserving the high resolution pattern while eliminating the fragility issue
3Manufacturing precision
If SU-8 photoresist is used for mold fabrication, then high resolution microstructures can be created, but the photoresin is prone to delamination
Solution Approach 1:
The patent employs composite material structures where the photoresist layer is combined with adhesion promoters or coupling layers that prevent delamination. This composite approach maintains the high resolution patterning capability of SU-8 while adding an intermediate layer that ensures strong bonding to the substrate
Solution Approach 2:
The patent modifies the photoresist formulation or processing parameters to improve adhesion. This may involve changing the curing conditions, adding adhesion promoters to the photoresist composition, or adjusting the substrate surface treatment to enhance bonding between the photoresist and substrate
4Manufacturing precision
If clean room facilities are used for lithography, then high precision masks and lithographic processes can be performed, but the equipment is expensive and not accessible to all laboratories
Solution Approach 1:
The patent creates a master mold using lithography in a clean room facility, then uses this master to produce multiple replicas through a simpler molding process. This allows the expensive lithography step to be performed once to create the master, while subsequent replication can be done in ordinary laboratories without clean room requirements
Solution Approach 2:
The patent performs the complex lithographic patterning in advance to create a master mold that encapsulates all the microstructural features. This preliminary action transfers the requirement for expensive equipment and clean room facilities to a single upfront step, enabling subsequent production to be done with simpler, more accessible equipment
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 method enables the production of large-scale microfluidic bioreactors with high resolution and durability, reducing manufacturing costs and increasing the efficiency and yield of bio-products, while being accessible to laboratories without advanced facilities.
Implementation Method 1
forming a male mold (ERmold) from a photopolymer plate, using replica molding with the Fmold
Data Source
AI summary
Large bioreactors based on microfluidic technology, and methods of manufacturing the same, are provided, The big microbioreactor can include a chip or substrate having the microfluidic channels thereon, and the chip can be manufactured by forming a master mold, forming a male mold from a photopolymer plate using replica molding with the Fmold, and transferring features of the male to a polymer material.