Fluidic Device Local Coating for Assay Sensitivity
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Solution Overview
Problem
Existing fluidic devices face challenges in accurately localizing antibodies to specific areas within fluidic channels for enhanced analyte detection, leading to analyte depletion and reduced assay sensitivity, especially in closed systems where pre-bonding application of antibodies is not feasible.
Innovation Solution
A fluidic device with intersecting channels and a fluid control system that prevents coating fluid from leaking into non-target channels, using either a pump system or capillary forces to ensure precise coating of the common junction and adjacent areas, while maintaining the integrity of closed channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If coating fluid is flown over the entire surface to couple antibodies, then the surface is fully functionalized, but the analyte is depleted over the functionalized area leading to decreased assay sensitivity
Solution Approach 1:
The patent applies local quality by restricting antibody coating to only the sensing region of the sensor surface. The fluidic device is designed with specific channel geometries and flow control mechanisms that direct coating fluid exclusively to the sensing area, creating non-uniform functionalization that matches the spatial distribution of the sensing elements. This localized coating prevents analyte depletion in non-sensing areas while ensuring adequate antibody coverage where detection occurs, thereby maintaining assay sensitivity.
2Ease of manufacture
If functionalization is performed during manufacturing, then the device can be produced with pre-coated surfaces, but closed fluidic channels cannot be accessed for coating
Solution Approach 1:
The patent applies preliminary action by providing instructions that enable users to perform functionalization after the closed fluidic device has been manufactured and sealed. The device includes built-in fluidic access features such as removable caps, valves, or injection ports that allow coating fluid to be introduced into the closed channels post-manufacturing. This approach separates the manufacturing process from the functionalization process, enabling both closed-system integrity and flexible antibody coating capability.
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 enhances assay sensitivity by minimizing analyte depletion and allows for efficient coating of specific areas within fluidic devices, even in closed systems, without the need for external coating during manufacturing.
Implementation Method 1
the capillary system comprises: a capillary pump coupled to the second fluidic channel; and the resistivity of the first and the second fluidic channel and the capillary pressure in the capillary pump and in the third and fourth channels are adapted such that the coating fluid does not flow into the third or the fourth channel
Data Source
AI summary
A fluidic device (100) is described for locally coating an inner surface of a fluidic channel. The fluidic device (100) comprises a first (101), a second (102) and a third (103) fluidic channel intersecting at a common junction (105). The first fluidic channel is connectable to a coating fluid reservoir and the third fluidic channel is connectable to a sample fluid reservoir. The fluidic device (100) further comprises a fluid control means (111) configured for creating a fluidic flow path for a coating fluid at the common junction (105) such that, when coating, a coating fluid propagates from the first (101) to the second (102) fluidic channel via the common junction (105) without propagating into the third (103) fluidic channel. A corresponding method for coating and for sensing also has been disclosed.