Electro-osmotic Pump Bubble-Free Operation
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Solution Overview
Problem
There is a need for inexpensive, reliable electro-osmotic pumps that can deliver fluids, such as drugs or allergens, to a subject without fouling and at desired intervals or rates, as existing pumps often suffer from issues like gas bubble interference and high operational costs.
Innovation Solution
A direct current electro-osmotic pump system is developed, featuring a porous cathode and anode without platinum, along with a porous ceramic membrane, operating at a potential difference of up to 3 volts without producing visible bubbles, using Ag2O and Ag electrodes, and a silica-based membrane with specific dimensions and coatings to ensure efficient and bubble-free fluid delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If platinum electrodes are used in electro-osmotic pumps, then the pump reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent replaces expensive platinum electrodes with cheaper alternative materials such as carbon, silver, or stainless steel electrodes. These electrodes are designed to be consumable or replaceable, accepting that they may degrade over time but providing cost-effective operation for the intended application lifecycle. This substitution directly addresses the contradiction by dramatically reducing manufacturing cost while maintaining adequate reliability for the specific drug delivery application.
Solution Approach 2:
The patent modifies the operating parameters by using low voltage (below 3 volts) DC electro-osmosis to minimize electrolysis and gas bubble formation. This parameter change allows the use of less expensive electrode materials that would otherwise be unsuitable at higher voltages, thereby reducing manufacturing cost while maintaining pump reliability through optimized operating conditions.
2Productivity
If high voltage is applied to drive fluid flow, then the productivity is improved, but gas bubble formation increases
Solution Approach 1:
The patent fundamentally changes the operating voltage parameter from conventional high voltage to low voltage (below 3 volts) DC operation. This parameter change reduces electrolysis and gas bubble formation while maintaining adequate fluid flow rates through the electro-osmotic effect in the porous membrane, directly resolving the contradiction between productivity and harmful gas generation.
Solution Approach 2:
The patent employs porous ceramic membranes with specific pore structures that enhance electro-osmotic flow efficiency. The porous material allows effective fluid pumping at low voltages by utilizing the electro-osmotic effect within the pore structure, thereby achieving adequate productivity without the gas bubble formation associated with high voltage operation.
3Device complexity
If simple electrode structures are used, then the device complexity is reduced, but the pump reliability deteriorates
Solution Approach 1:
The patent uses simple, inexpensive electrode materials such as carbon rods, silver wires, or stainless steel elements with basic geometries. These simple structures are accepted as consumable components that may degrade over time, providing adequate reliability for the intended application duration while minimizing device complexity and manufacturing cost.
Solution Approach 2:
The patent compensates for the simplicity of electrode structures by optimizing operating parameters, specifically using low voltage DC operation and controlling current density. This parameter optimization ensures stable pump operation and reliable fluid delivery despite the use of simple electrode geometries, resolving the contradiction between device complexity and pump reliability.
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 system provides a low-cost, reliable method for delivering fluids, ensuring consistent flow rates and preventing bubble formation, making it suitable for drug delivery systems without the need for expensive platinum components.
Implementation Method 1
a direct current electro-osmotic pump comprising: a porous cathode free of platinum; a porous anode free of platinum; and a porous ceramic membrane between the cathode and the anode
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~4D
AI summary
A direct current electro-osmotic pump comprising: a porous, platinum-free cathode; a porous, platinum-free anode; and a porous ceramic membrane between the cathode and the anode, wherein at least a part of the surface of the membrane is in physical contact with the anode, and at least a part of the opposite side of the membrane is in physical contact with the cathode, and wherein the pump is configured to operate at a potential difference (V) between the anode and the cathode of V≦3 volts without producing bubbles visible to the naked eye.