Microfluidic Device for Single Oocyte Trapping
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Solution Overview
Problem
Current microfluidic devices for in vitro fertilization (IVF) are labor-intensive, time-consuming, and inefficient in oocyte trapping, fertilization, and embryo culture due to limitations in design, such as narrow micro-channels, suboptimal well depths, and complexity in sperm and debris removal, which hinder high-throughput single oocyte trapping and convenient embryo retrieval.
Innovation Solution
An integrated microfluidic device with a micro-channel and micro-well array, where the micro-channel height is greater than the oocyte diameter, allowing for efficient oocyte trapping, fluidic connection, and easy retrieval, along with features like adjustable well depths and widths, and the option for transparent or reflective materials, facilitating high-throughput oocyte trapping and embryo culture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a narrow micro-channel is used to position the oocyte, then the oocyte positioning capability is improved, but the fluid shear stress increases causing harm to the oocyte and the device cannot simultaneously position multiple oocytes
Solution Approach 1:
The device segments the oocyte positioning function into multiple independent micro-wells instead of using a single narrow channel. Each micro-well can trap one or more oocytes independently, eliminating the need for narrow channels while maintaining positioning capability. This allows simultaneous positioning of multiple oocytes without exposing them to harmful shear stress from narrow channel confinement.
2Object-affected harmful factors
If the micro-channel height is increased to reduce fluid shear stress, then the oocyte protection is improved, but the device loses the ability to effectively trap and position single oocytes
Solution Approach 1:
The device separates the fluid flow function (in wide micro-channel) from the trapping function (in micro-wells). The micro-channel provides a wide, low-stress pathway for oocyte transport, while the micro-wells provide the confinement needed for effective trapping. This segmentation allows both wide channels and effective trapping to coexist.
Solution Approach 2:
The micro-wells act as intermediary structures that receive oocytes from the wide micro-channel and provide the necessary confinement for trapping. The oocytes are transported safely through the wide channel and then transferred to the micro-wells where positioning occurs, eliminating the need for narrow channels while maintaining trapping efficiency.
3Device complexity
If conventional manual pipetting methods are used for gamete manipulation, then the equipment simplicity is maintained, but the labor intensity and time consumption increase significantly
Solution Approach 1:
The microfluidic device performs gamete manipulation automatically through integrated micro-channels and micro-wells. The system self-regulates fluid flow, oocyte transport, and sperm loading without requiring manual pipetting operations. This automation dramatically reduces labor intensity and time consumption while maintaining operational simplicity through a single-chip integration.
4Adaptability or versatility
If multiple washing and transport steps are used to transfer zygotes between different media, then the fertilization and culture requirements are met, but the process complexity and time consumption increase
Solution Approach 1:
The device merges the fertilization chamber and embryo culture chamber into a single integrated microfluidic system. The micro-channel connects the micro-well array for fertilization with the culture area, allowing zygotes to remain in the same device throughout fertilization and early culture. This eliminates multiple transfer steps and reduces process complexity while maintaining the ability to provide appropriate media conditions.
Data Source
AI summary
An integrated microfluidic device and its usage are provided. The microfluidic device comprises an upper layer (1) and a lower layer (2), wherein the lower layer (2) is bound to the upper layer (1). The upper layer (1) comprises a micro-channel (3) and the lower layer (2) comprises a micro-well (7) array. The micro-channel (3) is in fluidic connection with the micro-well (7) array, and the height of the micro-channel (3) is greater than the diameter of the oocyte (4) flowing through the micro-channel (3). The integrated microfluidic device has many advantages including low cost, high integration, and convenient operation, and has application prospects in reproductive medicine and the research of fertilization and embryo early development.