Fluid Analysis Chip with Expanding Channel for Uniform Flow
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Solution Overview
Problem
Conventional lab-on-a-chip devices with microchannels experience irregular and nonuniform fluid movement patterns due to differences in acting forces between fluid and channel walls, leading to inconsistent analysis results and challenges in mass production.
Innovation Solution
The design incorporates expanding recesses or holes in the channel walls to ensure that fluids make contact only with upper and lower inner walls, creating a uniform movement pattern and reducing bubble generation, while chamfering parts and washing channels help maintain ideal speed profiles and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional microchannel structures are used with fluid contacting all channel walls, then manufacturing is simpler, but fluid movement becomes irregular and nonuniform leading to inconsistent analysis results
Solution Approach 1:
The channel structure is segmented into distinct regions: a first channel where fluid contacts upper, lower, and side walls, and a second channel where fluid contacts only upper and lower walls. This segmentation allows different flow regimes in different sections, achieving uniform overall flow while maintaining manufacturing feasibility through standardized substrate assembly processes.
Solution Approach 2:
Different sections of the channel have different structural qualities tailored to specific functions. The first channel section has full wall contact for initial fluid distribution, while the second channel section has only upper and lower walls for uniform laminar flow. This local differentiation optimizes fluid movement uniformity without requiring complete redesign of the entire channel system.
2Manufacturing precision
If edge parts of channels are processed precisely to achieve uniform fluid flow, then analysis consistency improves, but mass production becomes difficult and costly
Solution Approach 1:
The channel system is divided into a first channel formed in one substrate and a second channel formed in another substrate. These can be manufactured separately using standard microfabrication techniques without requiring precise edge processing, then assembled together to form the complete flow path, enabling mass production while maintaining flow uniformity.
Solution Approach 2:
The solution moves from solving the uniformity problem in a single-plane 2D channel to a 3D multi-substrate configuration. By stacking substrates with different channel configurations, the patent achieves uniform fluid flow without requiring precise edge processing in any single substrate, thus enabling mass production.
3Speed
If small-size motors are used to drive fluid flow, then chip size remains small, but device complexity increases and uniformity of fluid movement is compromised
Solution Approach 1:
The patent replaces mechanical pumping systems with passive capillary-driven flow. The channel geometry and surface properties are designed to generate sufficient capillary pressure to drive fluid through the device without motors, eliminating mechanical complexity while maintaining small chip size and enabling uniform fluid movement through carefully designed channel dimensions.
4Device complexity
If capillary force is used as the main driving force for fluid movement, then no motor is needed keeping the chip small, but fluid movement pattern becomes irregular due to differential acting forces on different channel walls
Solution Approach 1:
The capillary-driven flow system is segmented into two distinct channel sections. The first channel allows fluid to contact all walls for initial capillary-driven distribution, while the second channel restricts fluid contact to only upper and lower walls, creating symmetric capillary forces that produce uniform laminar flow. This segmentation resolves the irregularity problem while maintaining motor-free operation.
Solution Approach 2:
The patent introduces asymmetric channel design where the second channel has different wall configurations compared to conventional symmetric microchannels. By having only upper and lower walls in the second channel section, the design creates symmetric capillary acting forces that balance each other, producing uniform fluid flow patterns without requiring external control mechanisms.
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 approach results in a regular fluid movement pattern, reduced bubble formation, improved analysis reliability, and simplified mass production by eliminating edge processing complexities, enabling consistent detection of analytes and stable fluid flow.
Implementation Method 1
a method for limiting the width and height of a channel so as to allow fluids to move through a microchannel due to capillary phenomenon
Data Source
AI summary
A fluid analysis chip includes a channel formed within the chip. The chip includes a sample inlet and a sample outlet communicating with an outside of the chip, where the sample inlet and the sample outlet communicate with each other through the closed channel. An expanding part of the channel is formed in a longitudinal direction of the channel in such a manner that a pair of inner walls of the channel define an inner surface of the expanding part, and the expanding part has a larger sectional area than the channel.