Microfluidic Device for Precise Cell Positioning and Stable Culture
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Solution Overview
Problem
Current microfluidic devices are inadequate for integrated cell positioning, motility screening, medium replacement, and dynamic monitoring, particularly in applications like in vitro fertilization, where stable temperature and humidity control are challenging, and existing devices either fail to selectively position multiple embryos or suffer from shear forces and limited cell-environment interaction.
Innovation Solution
A microfluidic device with a microstructure layer and a cover layer connected by microchannels, featuring positioning wells and inlet pools, allowing for precise cell or organism positioning, motility screening, and medium replacement, with flexible microstructure designs and layers made of glass or PDMS for stable and controlled environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Petri dish or tube methods are used for IVF procedures, then operations are simple and equipment is basic, but temperature and humidity control are unstable and the process is labor-intensive
Solution Approach 1:
The patent integrates multiple IVF operations (sperm motility screening, oocyte fertilization, medium replacement, and embryo culture) into a single microfluidic device with interconnected chambers and channels. This merging of functions into one integrated system provides stable temperature and humidity control while reducing labor intensity, directly resolving the contradiction between reliability and device complexity.
2Manufacturing precision
If constriction structures are used in microdevices for embryo positioning, then embryo can be parked at desired location, but shear force cannot be avoided and multiple embryo handling becomes inconvenient
Solution Approach 1:
The patent removes the constriction structure from the microdevice design and replaces it with open chambers and gentle flow control mechanisms. This extraction of the harmful constriction element eliminates shear force while maintaining the ability to position and handle multiple embryos conveniently, resolving the contradiction between positioning precision and harmful factors.
3Productivity
If well array with multiple wells is used for handling cell groups, then multiple cells can be handled simultaneously, but communication between cells in adjacent wells is highly limited
Solution Approach 1:
The patent uses a single continuous chamber design instead of separated wells, allowing multiple cells to be handled simultaneously while maintaining direct physical contact and fluid communication between them. This merging approach enables both high productivity and preserved cell-cell communication, resolving the contradiction between multi-cell handling capacity and information loss.
Data Source
AI summary
A micro fluidic device comprises one microstructure layer (5) and one cover layer (1), wherein the cover layer (1) is connected to the microstructure layer (5). The microstructure layer (5) comprises one bottom layer and a plurality of microstructures on it to position samples. The cover layer (1) comprises one top layer, one positioning well (6) and at least one inlet pool (4). The positioning well (6) is right above the microstructures and connected with each other. The inlet pools (4) and the positioning well (6) are connected by microchannels (3) which are formed between the microstructure layer (5) and the cover layer (1). The micro fluidic device can be applied in vitro fertilization, in determining how glial cells affect neurons, in constructing neural network and in detecting cell growth conditions.