Miniature Pump Using Hydrogel Swelling for Power-Free Dispensing
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Solution Overview
Problem
Conventional pumps require external power sources or mechanical components, limiting their portability, efficiency, and applicability in dispensing fluids, gels, or gases without complex activation mechanisms.
Innovation Solution
A miniature pump design utilizing a flexible diaphragm and superporous hydrogel beads that swell in response to environmental stimuli, such as temperature or pH changes, to dispense stored substances through a porous wall and activation fluid, eliminating the need for external power and mechanical parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional pumps use external power sources or mechanical components, then they can achieve reliable pumping function, but their portability and simplicity are limited
Solution Approach 1:
The patent replaces traditional mechanical pumping components (motors, pistons, valves) with a biological membrane system. The plant cell membrane acts as a selective barrier that passively controls fluid transport through osmotic pressure and membrane permeability, eliminating the need for external power sources and complex mechanical actuation mechanisms.
Solution Approach 2:
The pump system utilizes self-regulating biological properties of plant cell membranes, including osmotic response to solute concentration gradients and passive transport mechanisms. The membrane automatically adjusts its permeability and transport rate based on environmental conditions (solvent composition, temperature, pH), requiring no external control systems.
2Productivity
If conventional pumps use external power sources, then they can achieve controlled dispensing, but they require complex activation mechanisms
Solution Approach 1:
The patent controls dispensing by changing environmental parameters (solvent composition, temperature, pH) that directly affect membrane permeability and osmotic pressure. For example, adjusting the solvent's polarity or ionic strength modifies the membrane's transport properties, enabling controlled fluid release without mechanical actuators.
Solution Approach 2:
The plant cell membrane serves multiple functions simultaneously: it acts as a selective barrier, a pressure-regulating valve, and a response sensor for environmental stimuli. This multi-functionality replaces the need for separate control mechanisms for each pumping parameter (flow rate, pressure, timing).
3Weight of moving object
If conventional pumps are designed for portability, then they reduce mechanical components, but their efficiency and reliability decrease
Solution Approach 1:
The patent uses thin biological membranes (plant cell walls and plasma membranes) as the core pumping element. These flexible, micrometer-thin structures provide high surface-area-to-volume ratios that enhance transport efficiency while minimizing material usage and weight. The membrane's flexibility allows dynamic response to pressure and osmotic changes.
Solution Approach 2:
The system combines the plant cell membrane (biological component) with a supporting matrix or scaffold (synthetic component) to create a composite structure. This composite provides both the lightweight, selective transport properties of the biological membrane and the mechanical strength and stability of the synthetic support, ensuring reliability without sacrificing portability.
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
Enables the portable, efficient, and selective dispensing of fluids, gels, or gases without external power, offering a lightweight, inexpensive, and disposable pumping solution suitable for various applications, including medical treatments.
Implementation Method 1
a layer of absorbent material disposed upon a surface of the diaphragm opposite the chamber
Implementation Method 2
The pump further includes a second pump body sealingly engaged to the first pump body having first and second chambers connected by a porous wall that, when the pump is activated, allows a stored activation fluid to flow from the first chamber through the second chamber, and onto the layer of absorbent material to cause the layer of absorbent material to swell in size
Implementation Method 3
first and second chambers connected by a porous wall that, when the pump is activated, allows a stored activation fluid to flow from the first chamber through the second chamber
Implementation Method 4
The swelling of the absorbent material can cause the diaphragm to flex into the first pump body chamber and thereby urge the flowable substance toward the one or more exit ports
Data Source
AI summary
Miniature pumps for dispensing a volume a flowable substance are described. One pump embodiment includes an environmentally-responsive plug layer that can contract in size, e.g., when exposed to an environmental change such as temperature, to allow an activation solution to flow to a layer of expandable material, such as a superporous hydrogel. Expansion of the expandable material urges a diaphragm into a chamber that holds the dispensable fluid, gas, or gel, forcing the fluid, gas or gel out of the pump.