Microfluidic Device Ventilation Channel for Dry Reagent Stability
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Solution Overview
Problem
Existing microfluidic devices face challenges in maintaining the stability of dry reagents and ensuring reliable dissolution, particularly due to potential fluid or moisture ingress into the reagent storage chambers.
Innovation Solution
The proposed microfluidic device incorporates a separation between a microfluidic channel and a ventilation channel connected to a dry reagent pre-storage chamber, optimizing reagent stability and dissolution by preventing fluid ingress and allowing controlled venting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single channel is used for both fluid transport and venting the dry reagent chamber, then device complexity is reduced, but fluid or moisture can ingress into the reagent chamber compromising stability
Solution Approach 1:
The channel system is segmented into two distinct channels: a microfluidic channel for fluid transport and a separate ventilation channel for venting the dry reagent pre-storage chamber. This segmentation prevents fluid ingress into the reagent chamber while maintaining relatively simple device architecture.
Solution Approach 2:
The ventilation channel acts as an intermediary pathway that allows the dry reagent chamber to be vented to the environment without direct connection to the fluid transport path. This intermediary structure enables controlled venting while isolating the reagent from potential fluid contamination.
2Ease of manufacture
If the ventilation channel is connected to the microfluidic channel, then manufacturing is simplified, but controlled dissolution of dry reagent cannot be achieved
Solution Approach 1:
The ventilation channel is manufactured as a separate structure from the microfluidic channel, allowing independent optimization of each channel's properties. The ventilation channel can be designed with specific dimensions and connections that enable controlled dissolution without compromising manufacturing simplicity.
Solution Approach 2:
The ventilation channel is designed with specific local characteristics (separate connection points, distinct pathway) that provide controlled dissolution functionality. This localized differentiation allows precise control over where and how the dry reagent dissolves, while the overall manufacturing process remains simplified.
3Productivity
If fluid is allowed to freely enter the dry reagent chamber for dissolution, then dissolution speed is increased, but reagent stability before dissolution is compromised
Solution Approach 1:
The ventilation channel serves as an intermediary that controls the dissolution process. It allows fluid to enter the dry reagent chamber in a controlled manner through defined connection points, enabling rapid dissolution while preventing uncontrolled fluid ingress that would compromise reagent stability during storage.
Solution Approach 2:
The separate ventilation channel is prepared in advance with specific connection geometry and positioning. This preliminary design enables controlled fluid entry paths that facilitate rapid dissolution when needed, while maintaining reagent stability during the storage phase before dissolution is initiated.
Data Source
AI summary
A microfluidic device for processing a sample is disclosed. The device includes an amplification functional module having a microfluidic channel for guiding a fluid, a dry reagent pre-storage chamber connected to the channel for pre-storing a dry reagent and a ventilation channel connected to the dry reagent pre-storage chamber for connecting the dry reagent pre-storage chamber to a ventilation opening. The ventilation channel is designed so as to be fluidically separate from the microfluidic channel.