Microfluidic Chip Segmentation for High-Throughput Skin Equivalent Culture
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Solution Overview
Problem
Conventional methods for reconstructing three-dimensional human skin equivalents in microfluidic systems face challenges such as low sample availability, poor propagation in culture, contraction of the dermal equivalent, and inferior barrier function, limiting their utility in percutaneous penetration and toxicity studies, and are often expensive and have low throughput.
Innovation Solution
A microfluidic chip with two fluidic compartments separated by a permeable support, enabling dynamic culture and high-throughput testing, featuring integrated temperature and humidity control, and allowing for precise fluid flow and cell seeding, which enhances morphogenesis and differentiation of organotypic cultures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tissue culture inserts are used to reconstruct human skin equivalents, then the basic structure can be formed, but the quality and reproducibility are poor due to sample limitations and culture propagation issues
Solution Approach 1:
The device segments the culture system into multiple independent compartments (apical and basal chambers) that can be independently controlled and filled. This allows multiple skin equivalent samples to be cultured in parallel, increasing the quantity of obtainable samples while maintaining consistent quality through standardized compartment design and culture conditions.
2Reliability
If conventional static culture methods are used, then the structure is simple to maintain, but the dermal equivalent contracts and barrier function is inferior
Solution Approach 1:
The device implements dynamic culture conditions by enabling continuous media perfusion through the dermal equivalent from the basal chamber to the apical chamber. This dynamic fluid flow prevents dermal equivalent contraction, enhances nutrient delivery, and improves barrier function development, while the modular chamber design keeps the system manageable in complexity.
3Productivity
If conventional methods are used for percutaneous penetration studies, then the procedures are established, but the cost is high and throughput is low
Solution Approach 1:
The device segments the testing platform into multiple independent culture compartments that can operate in parallel. Each compartment can independently perform permeation studies, thereby increasing overall throughput. The modular design using standard materials and simple fluidic connections keeps manufacturing costs low while enabling high-throughput capability.
4Reliability
If dermal equivalent is used to improve skin homeostasis, then the interaction between fibroblasts and keratinocytes enhances function, but the dermal equivalent contracts during culture
Solution Approach 1:
The device applies dynamic media perfusion through the dermal equivalent to counteract contraction forces. The continuous flow of culture media provides mechanical support and biochemical signals that maintain dermal equivalent structural stability while preserving the functional interaction between fibroblasts and keratinocytes for skin homeostasis.
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 microfluidic chip provides a cost-effective, high-precision platform for culturing and testing three-dimensional organotypic cultures, improving the quality and reproducibility of skin equivalents by maintaining a dynamic environment and enhancing barrier function, thus facilitating superior percutaneous penetration and toxicity studies.
Implementation Method 1
A permeable support separates the cavity into first and second fluidic compartments
Implementation Method 2
a thermal-electrical-cooling unit for controlling humidity of the atmosphere in the test chamber
Implementation Method 3
a chip temperature control unit in the chip holder for controlling a temperature of the microfluidic chip when mounted onto the chip holder
Data Source
AI summary
The present disclosure describes a microfluidic chip for culturing and in vitro testing of 3D organotypic cultures. The tests may be performed directly on the organotypic culture in the microfluidic chip. The microfluidic chip includes at least one microfluidic unit which includes two fluidic compartments, such as upper and lower, separated by a permeable supporting structure, one or more access opening for the fluidic compartments, and a set of lids interchangeable with a set of insets. The permeable support structure serves as a support for the organotypic culture. The upper and lower compartments may include inlets and outlets which allow fluids to be perfused into the lower compartment and fluids to be perfused into the upper compartment. The access opening may be closed with a lid or accommodate an inset.