3D Printed Electromagnetic Micropump With Synchronized Active Valves
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Solution Overview
Problem
Existing micropumps face limitations in achieving high flow rates, low power consumption, and planar geometry, with actuation mechanisms like piezoelectric, thermal, and pneumatic designs being impractical for portable applications, and electroosmotic pumps restricted to electrolytic solutions and low flow rates, while electromagnetically actuated pumps lack a combination of high flow rate, low power consumption, and planar geometry.
Innovation Solution
A 3D printed electromagnetically actuated micropump with integrated active valves and Hall effect sensors for synchronized membrane motion, optimizing pump stroke and valve opening, achieving high flow rates and backpressures at low drive voltage and low power consumption, with a modular and planar design for seamless integration into microfluidic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If piezoelectric actuation is used to achieve large actuating force and planar structure, then the micropump can deliver precise fluid volumes, but the driving voltage becomes high (>100 V) and the control circuit becomes complicated and bulky
Solution Approach 1:
The patent replaces piezoelectric mechanical actuation with electromagnetic actuation using planar coils and a flexible membrane with a magnetic layer. This substitution eliminates the need for high driving voltages and complicated control circuits while maintaining large actuating force capability. The electromagnetic system uses simple current control to achieve membrane deflection for fluid pumping.
Solution Approach 2:
The patent changes the actuation mechanism from piezoelectric to electromagnetic, fundamentally altering the operating parameters. Instead of requiring >100 V driving voltage, the electromagnetic system operates at low voltages with proportional current control, simplifying the power requirements and control circuitry while maintaining effective actuating force.
2Volume of moving object
If thermally actuated micropumps are used to achieve small volume and large actuation force, then the pump can be scaled down, but the current draw becomes high and response becomes slow
Solution Approach 1:
The patent replaces thermal actuation with electromagnetic actuation. The flexible membrane incorporates a magnetic layer that responds instantly to electromagnetic fields, eliminating the thermal inertia and slow response characteristic of thermally actuated pumps. This substitution maintains small pump volume while achieving fast response speeds.
Solution Approach 2:
The patent changes the actuation mechanism from thermal to electromagnetic, fundamentally altering the response characteristics. The magnetic layer in the flexible membrane responds immediately to electromagnetic field changes, eliminating the slow thermal response time while maintaining the compact size necessary for microfluidic applications.
3Volume of moving object
If passive valves are incorporated to achieve small footprint, then the pump occupies less volume, but the flow rate is significantly throttled
Solution Approach 1:
The patent replaces passive mechanical valves with an actively controlled electromagnetic valve system. The valve membrane, actuated by electromagnetic forces, can dynamically open and close to control fluid flow without the throttling effects of passive valve geometries. This active control enables high flow rates while maintaining a compact footprint.
Solution Approach 2:
The patent transitions from static passive valves to dynamic active electromagnetic valves. The valve membrane can be rapidly actuated by electromagnetic forces to open and close, providing dynamic flow control that eliminates the flow throttling inherent in passive valve designs while maintaining small device volume.
4Productivity
If electromagnetically actuated micropumps are designed for high flow rate, then the pump can deliver sufficient fluid volume, but the coils become bulky and power consumption increases
Solution Approach 1:
The patent uses a flexible membrane with an integrated magnetic layer instead of traditional bulky coils. The thin flexible membrane can be actuated by electromagnetic forces to achieve high flow rates while maintaining a compact form factor. This approach eliminates the need for large coil assemblies while delivering sufficient fluid volume.
Solution Approach 2:
The patent replaces traditional electromagnetic coil assemblies with a flexible membrane actuated by electromagnetic forces. This substitution dramatically reduces the volume required for the actuation mechanism while maintaining the capability to deliver high flow rates through efficient membrane deflection and fluid displacement.
5Area of stationary object
If electroosmotic micropumps are used to achieve small footprint and high precision fluid control, then the pump can be integrated on chip, but the fluid is restricted to electrolytic solutions and flow rate remains low
Solution Approach 1:
The patent replaces electroosmotic actuation with electromagnetic actuation of a flexible membrane. This substitution removes the restriction to electrolytic solutions, enabling pumping of any fluid type including non-conductive fluids. The electromagnetic membrane actuation maintains small footprint while achieving significantly higher flow rates through direct mechanical displacement.
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 micropump achieves the highest reported flow rate and backpressure values at this scale, with a specific flow rate of 11.89 ml/min·W and specific backpressure of 693.7 Pa/W, suitable for microfluidic lab and body-on-chip applications.
Implementation Method 1
Electromagnetically actuated micropumps seem to solve most delineated problems with low power consumption and driving voltage, fast response, and simple control
Implementation Method 2
A novel idea of incorporating two Hall effect sensors into the pump and valve chambers allowed optimization of the pump's operating parameters and synchronization of the pump's stroke relative to the valve opening onset
Data Source
AI summary
A 3D printed micropumping system and method is provided. The micropump incorporates an active electromagnetically actuated valve and two Hall effect sensors. Both uniquely added features allowed for better optimization of the pump's parameters through synchronizing the pumping and valve opening motions. This synchronous motion minimized fluid throttling and optimized the pumping stroke versus valve opening onset to realize the maximum possible flow rate and backpressure per consumed power (i.e., high efficiency). The resulting specific flow rates and backpressure were 11.89 ml/min·W and 693 Pa/W at 10V, respectively, the highest reported values at this scale and actuation method. Moreover, the pump's integration to lab-on-chip devices was experimentally verified. The pump's planar and modular design (i.e., versatility), combined with its efficient performance, low driving voltage, and low power consumption, qualifies it as a viable candidate for battery-operated portable point of care diagnostic chips lab-one-chip, and the emerging body-on-chip devices.