Microfluidic Chip Bead Integration via Intersection Trapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Microfluidic devices face challenges in efficiently integrating receptors, particularly for point-of-care diagnostics, due to issues like air bubbles, debris, uneven receptor distribution, and the need for precise timing and flow conditions, which can lead to invalid test results and are costly and time-consuming to manufacture.
Innovation Solution
A microfluidic chip design with a bead integration system featuring auxiliary channels and structural elements that trap beads at intersections, allowing for easy and quick integration of receptors without the need for centrifugation or local dispensing, enabling passive operation and reducing spreading and contamination risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lithography is used to localize receptors, then manufacturing precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the receptor localization function from complex lithography processes and implements it through a simple bead trapping mechanism at channel intersections. The structural elements at intersections passively trap beads through geometric constraints, eliminating the need for complex lithographic patterning while achieving precise receptor localization.
Solution Approach 2:
The patent uses simple, easily fabricated structural elements (such as protrusions or obstacles) at channel intersections that can be manufactured using standard microfluidic fabrication techniques. These simple structures replace expensive and complex lithography equipment, enabling cost-effective production of precisely localized receptors.
2Ease of manufacture
If spotting techniques are used to localize receptors, then ease of manufacture is improved, but manufacturing precision deteriorates due to spreading and uneven distribution
Solution Approach 1:
The patent introduces structural elements at channel intersections as intermediary structures that passively trap beads. These structural elements act as mediators between the bead suspension flow and the final receptor localization, using geometric constraints to achieve uniform distribution without the spreading and aggregation problems of direct spotting techniques.
Solution Approach 2:
The patent replaces mechanical spotting processes (which cause spreading and uneven distribution) with a passive geometric trapping mechanism at channel intersections. The trapping is achieved through the natural flow dynamics and geometric constraints of the channel structure, eliminating the need for mechanical deposition tools that cause precision problems.
3Ease of operation
If local dispensing of receptor solutions is used, then ease of operation is improved, but manufacturing precision deteriorates due to lack of resolution
Solution Approach 1:
The patent segments the channel structure into distinct regions with structural elements at intersections, creating separate trapping zones for beads. This segmentation allows simple global bead suspension loading while achieving precise local receptor density control through the geometric configuration of the structural elements at each intersection.
4Device complexity
If capillary forces are used to move liquid, then device complexity is reduced, but reliability deteriorates due to particulates and contamination
Solution Approach 1:
The patent incorporates filtration structures and smooth channel design as preliminary measures to prevent particulate formation and contamination before they can affect liquid flow. The structural elements are designed to minimize turbulence and dead zones where contaminants could accumulate, ensuring reliable capillary-driven flow throughout the device.
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 solution facilitates efficient and rapid integration of receptors, reducing manufacturing time and costs, while ensuring accurate and reliable analyte detection by maintaining stable liquid flow and preventing contamination, thus enhancing the reliability of point-of-care diagnostics.
Implementation Method 1
The structural elements are configured to retain, at said intersection, beads flowed in a bead suspension liquid advancing in said auxiliary microfluidic channel and passing the intersection
Implementation Method 2
Instead of using active pumping means, microfluidic devices are known, which use capillary forces for moving a liquid sample inside the microfluidic device
Implementation Method 3
Reactions that are limited at large scales (by diffusion of reactants) can be accelerated
Data Source
AI summary
The present invention is notably directed to a microfluidic chip. The chip comprises a main microfluidic channel, on one side of the chip, and a bead integration system. The bead integration system is arranged on said one side of the chip. It comprises an auxiliary microfluidic channel transverse to and in fluidic communication with the main microfluidic channel, so as to form an intersection therewith. The intersection is delimited by structural elements arranged in the main microfluidic channel. The structural elements are configured to retain, at said intersection, beads flowed in a bead suspension liquid advancing in said auxiliary microfluidic channel and passing the intersection. In addition, such structural elements are configured to let liquid advancing in the main microfluidic channel pass the intersection through the structural elements. The invention is further directed to related devices and methods.