Micro-reactor Array Cover Sheet Design
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Solution Overview
Problem
Current microarray chips face issues such as shallow hybridization solutions leading to low signal strength, sample wastage, cross-contamination, inconvenient operation, and bubble formation during hybridization, due to their design limitations.
Innovation Solution
A microarray reaction device comprising a chip with latticed areas and a cover sheet with bosses and through-holes, where the cover sheet combines with the chip to form reaction volumes, allowing for precise sample delivery and even distribution, preventing cross-contamination, and stabilizing the assay process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a standard-sized slide is used for microarray chip, then the chip can accommodate multiple samples, but a relatively large amount of sample is needed which results in sample wastage
Solution Approach 1:
The chip is divided into multiple independent reaction chambers (first chamber, second chamber, third chamber, fourth chamber), each capable of holding a small volume of sample. This segmentation allows parallel processing of multiple samples while using minimal sample volume in each chamber, resolving the contradiction between high-throughput capability and sample conservation.
2Shape
If the hybridization solution depth is shallow in current microarray chip, then the chip structure is compact, but relatively fewer molecules can participate in hybridization reactions resulting in lower hybridization signals
Solution Approach 1:
The reaction chambers are designed with nested structures where the coverslip forms an upper boundary and the chip substrate forms a lower boundary, creating three-dimensional reaction spaces. This nested configuration allows sufficient solution depth for strong hybridization signals while maintaining overall chip compactness through vertical stacking rather than horizontal expansion.
3Productivity
If multiple samples are analyzed on a single slide, then assay throughput is increased, but cross-contamination can easily occur and reduce reliability of the assay
Solution Approach 1:
The chip is segmented into multiple physically isolated reaction chambers that are sealed independently. Each chamber contains its own sample and reagents, preventing cross-contamination between samples while allowing simultaneous processing of multiple assays, thus maintaining both high throughput and assay reliability.
Solution Approach 2:
The coverslip acts as an intermediary component that seals the reaction chambers and prevents direct contact between different samples. This intermediary structure ensures physical isolation of samples while allowing the chip to process multiple samples in parallel, resolving the contradiction between throughput and accuracy.
4Ease of manufacture
If the coverslip is positioned to the slide after hybridization solution injection, then the chip can be assembled, but users must take enough care to avoid producing bubbles which complicates the operation
Solution Approach 1:
The reaction chambers are designed with pre-defined boundaries and access ports that allow solution injection before final sealing. This preliminary action enables users to introduce hybridization solutions without the risk of trapping bubbles during the sealing process, simplifying the overall assembly operation while maintaining manufacturing feasibility.
Data Source
AI summary
The present disclosure provides a cover sheet for a microarray reaction device. In one aspect, the present cover sheet or device ensures the reaction units/volumes are stable and/or consistent among assay samples and assay runs, allowing samples (e.g., reaction solutions) to be conveniently added and distributed uniformly.