Microfluidic Reagent Delivery Using Immiscible Fluid Barriers
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Solution Overview
Problem
Current microfluidic systems face challenges in delivering multiple reagents to reaction sites without cross-contamination, especially when reagents have short shelf lives or require special storage conditions, limiting their use in field applications where laboratory conditions are not available.
Innovation Solution
A method and apparatus that involve storing and delivering multiple fluids in a common vessel using immiscible separation fluids, allowing each fluid to be maintained separately until applied to a reaction site, where they can interact sequentially without mixing, and storing these fluids for extended periods without degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple reagents are stored separately using multiple pumps and valving systems, then cross-contamination is prevented, but device complexity increases
Solution Approach 1:
The patent combines multiple reagent storage functions into a single reservoir by using immiscible fluids to create separate storage zones. Instead of requiring multiple pumps and valving systems, the invention uses the natural separation of immiscible fluids (such as oil and water phases) to store multiple reagents in one container, eliminating the need for complex switching mechanisms while preventing cross-contamination.
Solution Approach 2:
The single reservoir system serves multiple functions: it stores multiple different reagents simultaneously, acts as a delivery system for sequential reagent introduction, and prevents cross-contamination all at once. The immiscible fluid interface creates a universal storage solution that replaces what would traditionally require separate dedicated storage and delivery systems for each reagent.
2Device complexity
If reagents are stored in a common vessel, then device complexity is reduced, but cross-contamination risk increases
Solution Approach 1:
The patent introduces immiscible fluids as intermediary barriers between different reagents in the common vessel. These immiscible fluids (such as an oil phase between aqueous reagent solutions) act as physical separators that prevent direct contact and cross-contamination between reagents while allowing all reagents to coexist in the same container. The intermediary fluid layer maintains reagent integrity without requiring complex mechanical separation systems.
3Manufacturing precision
If multiple pumps are used to deliver different reagents, then delivery precision is maintained, but loss of substance increases
Solution Approach 1:
The invention extracts the need for multiple pump systems and reagent transfer mechanisms by using immiscible fluid separation. Reagents remain in their designated zones within the single reservoir until needed, eliminating the transfer steps that cause waste. When a reagent is needed, it can be delivered directly from its storage zone without requiring physical transfer through pump systems, thereby preventing loss during transfer operations.
4Manufacturing precision
If reagents with short shelf lives are used, then reaction accuracy is improved, but duration of action decreases
Solution Approach 1:
The patent prepares multiple reagents in advance within the single reservoir, separated by immiscible fluids, so they are ready for immediate use when needed. This preliminary preparation allows the system to maintain reagents in a stable, ready-to-use state without degradation, enabling accurate reactions to be performed on-demand even with reagents that have short shelf lives. The immiscible separation preserves reagent stability during storage while allowing rapid sequential delivery when required.
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 enables precise, sequential delivery of reagents while preventing cross-contamination and maintaining reagent stability, enhancing the usability of microfluidic systems in field settings by allowing for accurate chemical and biochemical reactions over time.
Implementation Method 1
storing and delivering multiple fluids in a common vessel using immiscible separation fluids, allowing each fluid to be maintained separately until applied to a reaction site
Data Source
AI summary
A method and apparatus for delivering one or more fluids. Fluids may be delivered from a common vessel to a chemical, biological or biochemical process.