Jet Deflection Device for Microfluidic Flow Control
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Solution Overview
Problem
Microfluidic devices face complexity in fluid propulsion and control mechanisms, particularly in automated and flexible liquid handling operations with sub-milliliter volumes, as they require moving parts or external systems for fluid control.
Innovation Solution
The use of gas-liquid coupling to manipulate fluid dynamic behavior without moving parts, employing a fluid control system that injects a liquid into a chamber to form a membrane, creating pressure differentials for flow control, and utilizing centrifugal forces for separation and mixing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If externally actuated valves are used to block fluid passages, then fluid flow control is achieved, but device complexity increases due to additional materials and control circuits
Solution Approach 1:
The liquid jet itself performs the valve function by being deflected to block or unblock the vent passage. The system uses its own flowing liquid to control the gas pressure, eliminating the need for external valves and control circuits. The liquid jet acts as both the process fluid and the control mechanism.
Solution Approach 2:
The gas pressure acts as an intermediary between the liquid jet and the vent passage. By controlling the gas pressure in the chamber, the system indirectly controls whether the liquid jet blocks the vent, providing a smooth control mechanism without direct mechanical contact.
2Ease of operation
If passive valves with abrupt cross section changes are used, then fluid gating is achieved, but device complexity increases due to complex passage geometry
Solution Approach 1:
The flowing liquid jet automatically performs the gating function by being deflected to block or unblock the vent. No separate passive valve structures are needed - the liquid itself becomes the valve through its deflection behavior.
Solution Approach 2:
The system controls fluid gating by changing the deflection parameter of the liquid jet through gas pressure adjustment. By varying the gas pressure, the liquid jet can be deflected to different positions, dynamically controlling the blockage of the vent passage without changing the physical geometry.
3Adaptability or versatility
If moving parts are used for fluid control, then flexible liquid handling is achieved, but reliability decreases due to mechanical wear and failure
Solution Approach 1:
The patent replaces mechanical moving parts with a fluid-based control system. Instead of using mechanical valves or pumps with moving components, the system uses the liquid jet's deflection controlled by gas pressure to achieve flexible liquid handling without mechanical wear or failure points.
Solution Approach 2:
The liquid jet serves dual purposes: it is both the process fluid being handled and the control mechanism for flexibility. The same liquid that needs to be manipulated automatically performs the control function through its deflection, eliminating the need for separate mechanical control systems.
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 fluid handling by eliminating the need for external control systems, enabling automated and flexible manipulation of fluid flow, separation, and mixing within microfluidic devices, reducing complexity and enhancing operational efficiency.
Implementation Method 1
means for generating a pressure differential between the compartments to control a deflection of the injected liquid jet
Implementation Method 2
The means for injecting may include means for creating a centrifugal force acting on the liquid
Data Source
AI summary
Devices for controlling fluid flow, in particular microfluidic devices, are described, which exploit gas/liquid interfaces to control liquid flow in accordance with application requirements. Devices for on/off flow switching, centrifugal separation, mixing, metering and aliquoting are described.