Branched Microfluidic Aliquot Chip Segmentation
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Solution Overview
Problem
Current methods for single-cell isolation, such as serial dilution, micromanipulation, and flow cytometry, are inefficient and challenging for high-throughput analysis, particularly in maintaining cell viability and scalability for PCR analysis, and existing microfluidic technologies face limitations in mass production and compatibility with standard laboratory platforms.
Innovation Solution
The design of branched Microfluidic Aliquot Chips (bMA-Chip) with increased channel spacing and multiple segments for uniform liquid distribution, suitable for injection molding, and a multiplex hole punch strategy for rapid fabrication, enhances single-cell isolation and compatibility with standard production processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radial pattern channels are used to connect center inlet well to outlet wells, then channel density is high and space between channels is small, but fabrication by injection molding or laser cutting becomes challenging
Solution Approach 1:
The chip is divided into multiple segments (first segment, second segment, third segment) that extend from the inlet well to outlet wells in a non-radial pattern. This segmentation allows each segment to be spaced apart, making fabrication by injection molding or laser cutting feasible while still maintaining high channel density through efficient space utilization in the segmented layout
Solution Approach 2:
The channel arrangement transitions from a two-dimensional radial pattern to a multi-dimensional segmented layout that extends across the chip surface in different directions and planes. This dimensional reorganization increases the effective space between channels while maintaining high connectivity, enabling both high productivity and ease of manufacture
2Productivity
If microfluidic technology is used for single-cell isolation, then isolation efficiency is high, but requirement of additional skills for microfluid manipulation and poor compatibility with existing experimental platforms limits application
Solution Approach 1:
The microfluidic chip is designed with standardized features including a center inlet well, multiple outlet wells arranged in segments, and uniform channel dimensions that are compatible with existing microfluidic platforms and standard laboratory equipment. This universal design allows the chip to be used with common microfluidic manipulators and integration with existing experimental workflows, reducing the need for specialized skills
Solution Approach 2:
The channel dimensions, well sizes, and flow rates are optimized to operate within standard microfluidic parameter ranges that are compatible with conventional equipment. The segmented design with uniform spacing allows operation at standard flow rates and pressures, making the system accessible to researchers without specialized microfluidic training
3Productivity
If original MA-Chip design with 120 channels is used, then single-cell isolation capability is high, but space between neighboring channels is less than 40 μm making mass fabrication difficult
Solution Approach 1:
The 120 channels are organized into multiple segments (first segment with 24 channels, second segment with 48 channels, third segment with 48 channels) rather than a single radial array. This segmentation increases the minimum space between neighboring channels from less than 40 μm to greater than 400 μm, enabling mass fabrication by injection molding or laser cutting while maintaining high isolation throughput
Solution Approach 2:
The channel layout transitions from a compact radial pattern to an extended segmented arrangement that utilizes the full chip surface area. By distributing channels across multiple segments in different spatial zones, the design achieves both high channel count and adequate spacing for manufacturing
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 new design enables rapid, versatile, and cost-effective single-cell isolation with improved throughput and compatibility, reducing production time and costs, while maintaining high cell viability and scalability for PCR analysis.
Implementation Method 1
The chip is configured to maintain uniform distribution of liquid and cells from the inlet well to the outlet wells
Data Source
AI summary
According to the invention, generally, a microfluidic aliquot (MA) chip, adapted to fit in a Petri dish, has a center well (inlet) connected by branched channels to a plurality of side wells (outlets). The chip comes in various types, including a bMA Chip T1, bMA Chip T2, bMA Chip T3, and an rMA Chip. The branched channel improvement provides for a greater distance between neighboring channels and a decreased density near the center well. An insert and a base are configured to create an MA chip.