Portable Pressure Container Using Liquid-Gas Phase Change
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Solution Overview
Problem
Existing pressure-driven medical devices face challenges with maintaining a constant pressure over extended periods, especially in portable or mobile applications, due to the limitations of compressed gas storage, which can lead to increased size and complexity, affecting patient safety and handling comfort.
Innovation Solution
A portable pressure container with a liquid and gas storage system, where the liquid phase transitions to gas phase to maintain a constant pressure, ensuring only the gas phase is released, utilizing a porous storage medium to enhance evaporation and thermal energy from the body for sustained pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If highly pressurized pressure containers are used to maintain constant pressure over long time intervals, then the pressure stability is improved, but the device size and filling volume increase
Solution Approach 1:
The patent changes the physical state of the driving medium from gas to liquid, allowing storage at lower pressures while maintaining constant pressure output through controlled evaporation. The liquid driving medium is stored in a partially filled pressure container, where the liquid level provides a reservoir that evaporates to maintain pressure, eliminating the need for highly pressurized storage.
Solution Approach 2:
The patent utilizes the phase transition between liquid and gas phases of the driving medium. The liquid driving medium evaporates to provide gas pressure, and the phase change occurs at a constant temperature and pressure point, ensuring stable pressure output. This phase transition mechanism allows the system to maintain constant pressure without requiring large volumes of highly pressurized gas storage.
2Volume of stationary object
If the pressure container size is reduced for portable applications, then the device portability is improved, but the duration of pressure supply is reduced
Solution Approach 1:
The patent changes the driving medium from gas to liquid state, which has much higher density. This allows a small volume of liquid to contain the equivalent energy and pressure potential of a much larger volume of gas, enabling portable devices to carry sufficient driving medium for extended operation without increasing container size.
Solution Approach 2:
The liquid driving medium undergoes controlled evaporation to provide sustained gas pressure over time. The phase transition from liquid to gas provides a continuous supply of pressurized gas from a compact liquid reservoir, extending the duration of pressure supply while maintaining a small, portable container size.
3Speed
If compressed gas is used as the driving medium, then the response speed is improved, but the pressure stability deteriorates over time
Solution Approach 1:
The patent utilizes the phase transition of the driving medium from liquid to gas. The liquid reservoir provides a stable source that evaporates to maintain constant pressure, as the evaporation process occurs at a characteristic temperature and pressure point. This ensures stable pressure output over time while the gas phase provides rapid response when needed.
Solution Approach 2:
The system uses the ambient temperature and the natural evaporation properties of the liquid driving medium to self-regulate pressure. The liquid evaporates at a controlled rate based on its vapor pressure characteristics, automatically maintaining stable pressure without external control mechanisms, while still providing rapid gas delivery when the needle is activated.
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
Provides a constant pressure source for medical devices, reducing device size and maintaining pressure over extended periods, enhancing patient safety and handling comfort.
Implementation Method 1
a liquid phase of a driving medium located inside the liquid storage portion is free to evaporate into the gas storage portion
Implementation Method 2
utilizing a porous storage medium to enhance evaporation and absorption
Data Source
AI summary
The present disclosure relates to a portable pressure container for driving a medical device. The container includes a pressure housing confining an interior volume and a pressure outlet extending through the pressure housing . The interior volume comprises a liquid storage portion and a gas storage portion. The liquid storage portion and the gas storage portion are in flow connection with each other. The liquid storage portion is configured to store a liquid phase of a driving medium. The gas storage portion is configured to store a gas phase of the driving medium. The pressure outlet is only in flow connection with the gas storage portion.