Fluid Analysis Chip with Expanding Channel Walls
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Solution Overview
Problem
Conventional lab-on-a-chip devices with microchannels experience irregular and nonuniform fluid movement patterns due to differing capillary forces between the fluid and channel walls, leading to inconsistent analysis results and challenges in mass production.
Innovation Solution
The chip features expanding parts on the inner walls of the microchannel, allowing fluids to contact only upper and lower walls, which reduces the impact of capillary forces between side walls, promoting uniform fluid movement and simplifying manufacturing by eliminating the need for precise edge formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If capillary force is used as the main driving force for fluid movement in microchannels, then fluid movement can be achieved without external motors, but the fluid movement pattern becomes irregular and nonuniform
Solution Approach 1:
The patent applies local quality by creating asymmetric channel wall structures where the left and right walls have different properties (e.g., different heights, roughness, or hydrophobicity). This local differentiation compensates for the inherent symmetry in capillary forces, allowing the fluid to experience uniform net capillary force throughout the channel while maintaining irregular movement patterns that can be controlled for consistent analyte detection.
2Measurement precision
If the channel structure is made with precise dimensions below several tens of micrometers, then fluid analysis precision is improved, but manufacturing difficulty and quality control become problematic
Solution Approach 1:
The patent segments the channel structure into distinct functional regions with different dimensional requirements. The channel is divided into sections with varying widths and depths, allowing each segment to be optimized for either manufacturing feasibility or analytical precision. This segmentation enables standard manufacturing processes to produce channels with sufficient precision for analyte detection without requiring ultra-precise fabrication across the entire structure.
3Stability of the object's composition
If the channel walls are made with different heights or properties, then fluid movement uniformity can be improved, but device complexity increases
Solution Approach 1:
The patent employs asymmetry by designing channel walls with different heights, roughnesses, or surface properties on the left and right sides. This asymmetric design creates a controlled imbalance in capillary forces that promotes uniform fluid movement patterns. The asymmetry is strategically designed to be simple and manufacturable, avoiding excessive complexity while achieving the desired fluid dynamics for consistent analyte detection.
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
This design ensures a regular fluid movement pattern, reduces bubble formation, and enhances the detection of analytes, facilitating consistent analysis results and easier mass production with improved quality control.
Implementation Method 1
a chip where main driving force causing movement of fluids is capillary force
Data Source
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AI summary
Disclosed is a fluid analysis chip including a microchannel formed within the chip. The chip includes a sample and a sample outlet communicating with an outside of the chip, and has a structure where the sample inlet and the sample outlet communicate with each other through the closed channel. An expanding part formed in a longitudinal direction of a channel in such a manner that a pair of inner walls corresponding to each other has a larger sectional area at a part or a whole thereof is formed. Therefore, fluids, which pass through the channel adjacent to the expanding part, move while making contact with only another pair of inner walls of the channel, which correspond to each other.