Patterned Flow Cell Bonding Regions for Leak-Resistant Sealing
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Solution Overview
Problem
Flow cells used in nucleic acid analysis face challenges with fluid leakage and inadequate bond integrity due to insufficient bonding surface area and compressive/shear holding power, which can compromise the integrity of reactions and detection processes.
Innovation Solution
The introduction of patterned substrates with depressions or posts in the bonding regions, increasing the surface area available for adhesive bonding, thereby enhancing the bond integrity and preventing fluid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional flat bonding region is used, then the device complexity is low, but the bonding strength and fluid leakage prevention are insufficient
Solution Approach 1:
The bonding region transitions from a flat two-dimensional surface to a three-dimensional patterned structure with depressions and posts. This dimensional change increases the surface area available for bonding by creating vertical features that extend the bonding interface, thereby enhancing bonding strength without requiring a larger overall device footprint.
Solution Approach 2:
Different regions of the bonding surface are given different local properties through patterning. The bonding region contains localized depressions and posts that concentrate adhesive material and enhance bonding at specific locations, while other areas remain flat. This local variation optimizes bonding strength at critical interfaces without unnecessarily complicating the entire bonding region.
2Force
If the bonding surface area is increased, then the compressive and shear holding power improve, but the manufacturing complexity increases
Solution Approach 1:
The bonding region is segmented into multiple discrete features including depressions, posts, and interstitial regions. This segmentation allows the bonding surface area to be distributed across multiple localized elements rather than requiring a single large continuous surface, making it easier to manufacture using standard lithographic processes while achieving high total bonding area.
Solution Approach 2:
The patterned bonding region creates a porous-like structure with interconnected depressions and posts that increase surface area. Similar to how porous materials increase surface area for catalysis or absorption, this patterned structure provides extensive bonding interfaces for adhesive material without requiring a proportionally large device area, balancing manufacturing feasibility with bonding performance.
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 patterned substrates improve the compressive and shear holding power, reducing fluid leakage and ensuring robust bonding, thus maintaining the integrity of reactions and detection processes in flow cells.
Implementation Method 1
These features introduce an additional axis for an adhesive to bond to, and also increase the surface area of the substrate that is available for bonding.
Data Source
AI summary
An example flow cell includes a patterned substrate having an active region and a bonding region that at least partially surrounds the active region. The active region includes first depressions defined in a layer of the patterned substrate, surface chemistry positioned in the first depressions, and first interstitial regions surrounding the first depressions. The bonding region includes second depressions defined in the layer and second interstitial regions surrounding the second depressions. An adhesive is positioned over the second depressions and over the second interstitial regions. A cover is attached to the adhesive such that a flow channel is defined between a portion of the cover and the active region.