Electrostatic Micropump with Orthoplanar Valves
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Solution Overview
Problem
Existing micropumps and valves in microfluidic systems are complex, costly to manufacture, and prone to leakage due to suboptimal tightness, especially in membrane micropumps, which complicates their miniaturization and integration with electromechanical actuators.
Innovation Solution
A micropump design featuring orthoplanar inlet and outlet valves without dedicated actuators, utilizing semiconductor materials and electrostatic actuation with capacitively coupled electrodes, allowing for passive control of fluid flow and simplified manufacturing, and incorporating two opposing membranes to increase processing volume and flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If micropumps and valves are equipped with movable members and electromechanical actuators, then fluid control function is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the complex electromechanical actuators and movable members from the valve structure. Instead, it uses fixed shutter elements that passively open and close based on pressure differential, extracting the actuation function from mechanical components and replacing it with pressure-driven operation.
Solution Approach 2:
The valves are designed to operate autonomously without external actuators. The shutter elements automatically respond to pressure changes across the membrane, with the pressure differential itself serving as the actuation mechanism, eliminating the need for dedicated control systems.
2Power
If piezoelectric or magnetic materials are used in actuators, then actuation performance is improved, but manufacturing process complexity and cost increase
Solution Approach 1:
The patent replaces piezoelectric or magnetic actuation systems with a purely mechanical pressure-driven system. The electrostatic actuators are replaced by pressure differential acting on the membrane, eliminating the need for specialized materials and complex deposition processes.
Solution Approach 2:
The invention uses uniform polymeric materials for both the membrane and shutter elements, eliminating the need for heterogeneous material stacks and specialized material deposition processes required for piezoelectric or magnetic actuators.
3Reliability
If tight sealing is implemented in membrane micropumps, then leakage is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses flexible polymeric membranes and shutter elements that can elastically deform to achieve sealing. The flexibility of the polymer materials allows for effective sealing without requiring extremely tight manufacturing tolerances, as the materials can conform to slight variations in alignment.
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 design simplifies the structure and manufacturing of micropumps, reduces costs, enhances sealing, and increases flow rates by eliminating the need for special materials and actuators, while maintaining effective operation with passive valve control.
Implementation Method 1
a first electrode structure, capacitively coupled to the first pumping membrane and configured to apply a first electrostatic force to the first pumping membrane in the presence of a first actuating voltage between the first electrode structure and the first pumping membrane
Data Source
AI summary
A micropump includes: a pumping chamber, between a first semiconductor substrate and a second semiconductor substrate bonded to each other; an inlet valve, having an inlet shutter element between an inlet passage and the pumping chamber; an outlet valve, having an outlet shutter element between the pumping chamber and an outlet passage; a first recess for housing the inlet shutter element when the inlet valve is in the open configuration, the first recess and the pumping chamber being fluidly coupled; a second recess for housing the outlet shutter element when the outlet valve is in the open configuration, the second recess and the pumping chamber being fluidly decoupled.