Single-Sheath Microfluidic Chip Geometric Constriction
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Solution Overview
Problem
Current microfluidic devices for particle or cellular material separation, such as sperm sorting, are time-consuming, inefficient in processing volumes, and cause damage to cells due to the need for multiple sheath fluid focusing regions, which increases operational costs and complexity.
Innovation Solution
A microfluidic chip design featuring a flow focusing channel with geometric constriction, eliminating the need for a secondary sheath fluid, utilizing physical channel geometry to focus and orient particles, thereby reducing sheath fluid volume and simplifying the system, while maintaining high purity and performance in sperm cell sorting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple sheath fluid focusing regions are used for particle or cellular material separation, then separation purity is improved, but device complexity and operational costs increase
Solution Approach 1:
The patent removes the second sheath fluid focusing region from the microfluidic device, extracting only the essential first focusing region. This elimination of redundant components simplifies the device structure while maintaining separation purity through the geometrically constricted channel design that provides sufficient focusing without additional sheath fluid regions.
Solution Approach 2:
The single sheath fluid channel performs multiple functions: it provides stream focusing and maintains separation purity throughout the channel. The geometric constriction of the channel itself serves as an additional focusing mechanism, making the single sheath fluid system multi-functional and equivalent to traditional two-sheath fluid systems.
2Manufacturing precision
If multiple sheath fluid focusing regions are used for particle or cellular material separation, then separation purity is improved, but volume of sheath fluid required increases
Solution Approach 1:
The patent eliminates the second sheath fluid focusing region, thereby extracting and removing the additional sheath fluid volume that would be required for a second focusing region. This reduction in sheath fluid volume directly addresses the quantity of substance concern while maintaining separation purity through the constricted channel geometry.
3Reliability
If traditional microfluidic separation techniques are used, then separation can be achieved, but processing time is excessive and throughput is limited
Solution Approach 1:
The patent employs a dynamic geometric constriction of the channel where the height and width are reduced along the flow path. This dynamic narrowing creates continuous focusing that adapts to the flow, enabling faster processing while maintaining separation effectiveness. The constricted geometry accelerates the focusing process, reducing the time required for separation.
Solution Approach 2:
The patent changes the physical parameters of the channel geometry (height and width) along the flow path to optimize both separation purity and processing speed. By progressively constricting the channel dimensions, the system achieves rapid focusing and high throughput while maintaining reliable separation effectiveness.
4Quantity of substance
If geometric constriction is used to focus particles, then sheath fluid volume is reduced, but channel manufacturing complexity increases
Solution Approach 1:
The patent utilizes parameter changes in channel geometry (progressive constriction of height and width) that can be manufactured using standard microfabrication techniques. The geometric constriction is designed with gradual transitions that are compatible with conventional manufacturing processes, balancing the reduction in sheath fluid volume with manufacturability.
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 achieves equivalent purity and improved functionality in sperm cell sorting, increasing the yield of eligible cells and enhancing resolution between Y- and X-chromosome bearing sperm cells, reducing operational costs and system complexity.
Implementation Method 1
utilizing said device and method that is continuous, has high throughput... microfluidic chip for isolating particles or cellular materials using laminar flow from a single sheath
Implementation Method 2
at least a portion of the flow focusing channel has a reduction in height and at least a portion of the flow focusing channel narrows in width, thereby geometrically constricting the flow focusing channel
Data Source
AI summary
Microfluidic devices and methods for focusing components in a fluid sample are described herein. The microfluidic device has at least one flow focusing channel where the components are focused or re-oriented by the geometry of the channel. From an upstream end of the flow focusing channel to a downstream end of the flow focusing channel, at least a portion of the flow focusing channel has a reduction in height and at least a portion of the flow focusing channel narrows in width, thereby geometrically constricting the flow focusing channel. The devices and methods can be utilized in sex-sorting of sperm cells to improve performance and increase eligibility.