Rotating Valve Microfluidic Device for Serial Operations
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Solution Overview
Problem
Conventional microfluidic devices are limited in their ability to perform a variety of fluidic operations beyond transferring fluid between two directly opposite fluidic chambers, as they typically have a linear, straight-through metering channel that only connects two opposing fluidic conduits, restricting the complexity of fluidic operations that can be executed.
Innovation Solution
A microfluidic device with a rotating valve featuring an angled internal channel that allows for sequential connection of multiple fluidic conduits and chambers, enabling a range of fluidic operations such as metering, mixing, lysing, and diluting by rotating the valve to bring adjacent conduits into communication, thereby expanding the scope of possible fluid transfers and operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a linear, straight-through metering channel is used in a rotating valve, then the device structure is simple and easy to manufacture, but the device can only transfer fluid between two directly opposite fluidic chambers, limiting operational functionality
Solution Approach 1:
The patent applies the dynamics principle by making the metering channel configurable between different states. The rotating valve can be rotated to different angular positions (0°, 45°, 90°, 135°, 180°, etc.) to change the connectivity pattern. At 0° and 180° positions, the channel connects opposite chambers (simple mode). At 45° and 135° positions, the channel connects adjacent chambers (complex mode). This dynamic reconfiguration allows a single simple structure to perform multiple operational functions.
Solution Approach 2:
The patent implements periodic action through the rotational movement of the valve. By rotating the valve in discrete angular steps (45° increments), the system periodically switches between different fluidic connection modes. This periodic rotation enables sequential access to multiple fluidic operations: transferring between opposite chambers, transferring between adjacent chambers, mixing fluids in intermediate chambers, and performing serial operations across multiple chambers.
2Device complexity
If only two fluidic chambers are connected via a linear metering channel, then the device complexity is low, but the device cannot perform a variety of different fluidic operations requiring multiple chambers
Solution Approach 1:
The rotating valve provides dynamic reconfiguration capability, allowing the same physical channel to connect different pairs of chambers based on rotation angle. This enables the system to access multiple-chamber operations (involving 3 or 4 chambers) without adding multiple separate channels, thereby increasing versatility while controlling complexity.
Solution Approach 2:
The single metering channel is designed to be multi-functional. By rotating the valve to different positions, the same channel performs different functions: (1) transfers fluid between opposite chambers, (2) transfers fluid between adjacent chambers, (3) enables mixing operations in intermediate chambers, and (4) supports serial fluidic operations across multiple chambers. This universal design eliminates the need for separate dedicated channels for each operation type.
3Adaptability or versatility
If multiple fluidic conduits and chambers are integrated around a rotating valve, then the device can perform multiple fluidic operations in series, but the device complexity increases
Solution Approach 1:
The patent merges multiple fluidic operations into a single integrated rotating valve assembly. Instead of having separate devices or complex valve mechanisms for each operation type, all chambers and connection pathways are combined within one rotating valve structure. The angularly spaced conduits (0°, 45°, 90°, 135°, 180°, etc.) are all integrated into the same valve body, allowing sequential access to multiple operations through simple rotation.
Solution Approach 2:
The rotating valve is segmented into angularly positioned conduits and chambers that can be independently accessed through rotation. Each conduit-chamber pair represents a discrete functional unit (e.g., chamber A at 0°, chamber B at 45°, chamber C at 90°, etc.). By rotating to specific angular positions, the system selectively engages specific segments for operation, enabling complex multi-chamber sequences while maintaining modular simplicity.
Data Source
AI summary
An integrated microfluidic device for carrying out a series of fluidic operations includes a housing including a plurality of n microfluidic conduits, wherein n is at least three, and a rotating valve having an internal channel with an entrance port and an exit port that are angularly separated. The rotating valve is positionable in a first position to connect two of the n fluidic conduits via the internal channel, and upon rotating the valve to a second position, two other of the n fluidic conduits are connected by the internal channel. The device further may include one or more fluidic chambers in fluid communication with respective fluidic conduits. Fluid contained in one fluidic chamber is transferrable by application of positive or negative gas pressure through associated fluidic conduits into another fluidic chamber via the internal channel. The device may be utilized to perform a variety of fluidic operations.