Microfluidic Channel Structure with Tapered Layers for Signal Redirection
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Solution Overview
Problem
The fabrication of microfluidic channels is inefficient, complex, and expensive, and existing technologies struggle with integrating electrodes or devices near the channel, as well as accurately measuring samples, due to the need for specialized and costly equipment like electron beam exposure apparatuses and interference photoetching technologies.
Innovation Solution
A microfluidic channel structure with a support portion, foundation portions, and channel defining layers made of the same material, where the channel is formed by a gap between these layers, allowing for efficient excitation and detection of samples using a signal transmitter and detector, and a fabrication method that includes preparing a support portion and forming foundation and channel layers with tapered cross sections to redirect excitation signals and enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If specialized fabrication technologies like electron beam exposure and interference photoetching are used, then manufacturing precision of microfluidic channels is improved, but device complexity and fabrication cost increase
Solution Approach 1:
The patent uses a mold structure that can be reused to create multiple identical microfluidic channels. The mold contains precise channel patterns that are copied onto the substrate through simple contactless etching, eliminating the need for complex electron beam exposure for each channel. This copying approach maintains manufacturing precision while dramatically reducing fabrication process complexity
Solution Approach 2:
The fabrication process is segmented into distinct modules: mold preparation, substrate preparation, contactless etching, and electrode integration. Each module can be independently optimized and performed using standard equipment. The channel structure itself is segmented into separate layers (substrate, channel defining layer, electrode layer) that can be fabricated and assembled independently, reducing overall process complexity
2Ease of manufacture
If traditional microfluidic channel structures are used, then fabrication simplicity is maintained, but integration of electrodes and detection devices near the channel is difficult
Solution Approach 1:
The patent merges the channel fabrication process with electrode and detector integration into a single unified structure. The channel defining layer and electrode layer are formed in the same fabrication sequence on the same substrate, allowing electrodes to be positioned precisely adjacent to channel regions. This merging enables simultaneous achievement of fabrication simplicity and integration capability
Solution Approach 2:
The patent transitions from planar channel structures to three-dimensional integrated structures where channels, electrodes, and detectors are arranged in multiple layers and spatial configurations. The contactless etching technique enables channel formation in a dimension separate from the electrode plane, allowing vertical stacking and enhanced integration without compromising fabrication simplicity
3Measurement precision
If conventional detection methods are used, then equipment cost is reduced, but measurement precision and sample signal detection accuracy deteriorate
Solution Approach 1:
The microfluidic channel structure itself serves dual functions: it confines and transports samples while simultaneously acting as an integrated detection platform. The channel walls incorporate fluorescent markers and the structure enables signal concentration through its geometry, allowing the channel to 'self-perform' detection functions without requiring separate complex detection equipment
Solution Approach 2:
The patent implements local quality enhancements at specific detection regions within the channel, such as incorporating fluorescent markers in particular zones or creating signal concentration zones through geometric features. This localized optimization improves measurement precision at critical points without requiring complex detection systems throughout the entire 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 approach simplifies the fabrication process, reduces costs, and improves measurement accuracy by efficiently redirecting excitation signals and enhancing the strength of sample signals, facilitating the integration of electrodes and devices near the microfluidic channel.
Implementation Method 1
a first channel layer and a second channel layer, the first channel layer covering the first foundation, the second channel layer covering the second foundation, a gap between the first channel layer and the second channel layer defining a microfluidic channel
Data Source
AI summary
A microfluidic channel structure and a fabrication method thereof, a microfluidic detecting device and a detecting method thereof are disclosed. The microfluidic channel structure includes a support portion; a foundation portion, provided on the support portion and including a first foundation and a second foundation spaced apart from each other; and a channel defining portion, provided on a side of the foundation portion that is away from the support portion and including a first channel layer and a second channel layer, the first channel layer covering the first foundation and the second channel layer covering the second foundation have a gap therebetween to define a microfluidic channel; and the first channel layer and the second channel layer are made of a same material.