Microfluidic Rectifier Unit with Umbrella Valves for Bubble Suppression
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Solution Overview
Problem
Existing microfluidic systems for examining biofilms and cell aggregates face issues with bubble formation due to temperature gradients, leading to non-physiological culturing conditions and system complexity, especially when using separate incubators and hose connections.
Innovation Solution
A microfluidic device with a rectifier unit featuring a substrate, valve assembly, and fluid channel arrangement, utilizing umbrella valves with through-holes under the umbrella to suppress bubble fixation and ensure unidirectional flow, allowing a compact and flexible setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If separate incubators and hose connections are used for substrate and microfluidic system, then controlled ambient conditions can be maintained, but bubble formation occurs due to temperature gradients and system complexity increases
Solution Approach 1:
The patent integrates the substrate with the microfluidic system into a single unified structure, eliminating the need for separate incubators and hose connections. This merging eliminates the temperature gradients that cause bubble formation while maintaining controlled ambient conditions through the integrated design.
Solution Approach 2:
The patent removes the intermediate hose connections and separate incubator components from the system. By extracting these elements, the design eliminates the sources of bubble formation (temperature gradients at connections) while simplifying the overall system architecture.
2Quantity of substance
If hose connections are used between microfluidic system and substrate, then fluid transport is enabled, but dead volume increases and bubble formation occurs
Solution Approach 1:
The patent combines the fluid transport function directly into the integrated substrate-microfluidic system, eliminating external hose connections. This integration removes dead volume associated with hoses while maintaining fluid transport capability through direct channels.
Solution Approach 2:
The patent extracts and removes the hose connections from the system, replacing them with integrated fluid channels. This extraction eliminates both the dead volume and the complexity associated with separate connection components.
3Reliability
If valve assembly with traditional design is used, then unidirectional flow control is achieved, but bubble fixation occurs at sharp edges
Solution Approach 1:
The patent applies curved surfaces and rounded edges in the valve assembly design, replacing sharp edges with curved geometries. This curvature modification prevents bubble fixation while maintaining the valve's unidirectional flow control function.
Solution Approach 2:
The patent applies different surface characteristics to different parts of the valve assembly - specifically rounding edges and corners where bubbles tend to accumulate, while maintaining the functional geometry of the valve opening. This localized modification addresses bubble issues without compromising flow control.
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 device achieves a unidirectional flow, reduces bubble formation, and maintains consistent liquid properties, enabling physiological cell culture conditions without external contamination, while minimizing system complexity and liquid volume.
Implementation Method 1
umbrella valves with through-holes under the umbrella to suppress bubble fixation and ensure unidirectional flow
Data Source
AI summary
A microfluidic device includes a rectifier unit, which includes a substrate, a valve assembly formed in the substrate, and a fluid channel arrangement formed in the substrate. The fluid channel arrangement comprises a first inlet opening, a second inlet opening, a first rectifier opening and a second rectifier opening. The valve assembly can be brought from a first state into a second state, wherein in the first state a liquid can be conveyed from the first inlet opening to the first rectifier opening and from the second rectifier opening to the second inlet opening, and wherein in the second state the liquid can be conveyed from the second inlet opening to the first rectifier opening and from the second rectifier opening to the first inlet opening. The valve assembly comprises four valves, one of which is an umbrella valve having a through-hole formed under the umbrella of the umbrella valve, the through-hole being covered by the umbrella in a blocking state of the valve.