Deformable Fluid Chamber for Nebulizer Reservoir Pressure Management
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Solution Overview
Problem
Nebulizers with rigid reservoirs face issues with residual gas and pressure buildup due to incomplete filling, leading to medicament loss when opened, especially with ethanolic preparations where vapor pressure varies with temperature.
Innovation Solution
A deformable fluid chamber is used in the nebulizer reservoir, which is filled partially or under reduced pressure, and optionally sealed under a protective gas atmosphere, to prevent pressure increases during storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the fluid chamber is filled completely with medicament liquid to displace gas, then the quantity of medicament is maximized, but pressure builds up during storage causing medicament loss
Solution Approach 1:
The patent applies partial filling by intentionally leaving headspace in the fluid chamber rather than filling it completely. This creates an air gap that acts as a compressible buffer, allowing the chamber to expand and contract with temperature changes without building excessive pressure. The partial filling quantity is specifically designed to balance medicament capacity with pressure management during storage.
Solution Approach 2:
The patent changes the physical parameters of the system by introducing a deformable fluid chamber with variable volume capability. The chamber can change its volume in response to pressure variations, allowing it to accommodate thermal expansion of the medicament liquid without rigid constraints. This dynamic parameter adjustment prevents pressure buildup while maintaining medicament quantity.
2Object-affected harmful factors
If the rigid reservoir is sealed hermetically to prevent contamination, then protection against external factors is improved, but pressure buildup from thermal expansion causes harmful effects
Solution Approach 1:
The patent replaces the rigid hermetic seal with a deformable fluid chamber that can flex and deform. This flexible membrane maintains the hermetic seal against external contamination while simultaneously accommodating internal pressure changes through elastic deformation. The flexible shell expands and contracts with temperature variations, preventing pressure buildup without compromising the protective seal.
Solution Approach 2:
The patent transitions from a static rigid reservoir to a dynamic deformable chamber that can adapt its volume. The chamber's ability to dynamically change shape and volume allows it to respond to thermal expansion and contraction in real-time, maintaining pressure equilibrium while preserving the hermetic seal against external contaminants throughout storage.
3Reliability
If ethanolic medicament preparation is used to achieve therapeutic effect, then treatment efficacy is improved, but vapor pressure variations with temperature cause pressure instability
Solution Approach 1:
The patent prepares the system in advance by creating a deformable chamber design that can absorb future pressure variations. The headspace and flexible walls act as a pre-configured cushion that will accommodate vapor pressure changes from the ethanolic preparation as temperature fluctuates during storage, preventing pressure instability before it becomes problematic.
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 method effectively minimizes pressure buildup in the fluid chamber, preventing medicament loss and ensuring stability over long storage periods and varying conditions.
Implementation Method 1
a deformable fluid chamber which is filled partially or under reduced pressure
Implementation Method 2
optionally sealed under a protective gas atmosphere
Implementation Method 3
a substantial pressure can build up in the bag containing the medicament preparation... temperature-induced expansion of the liquid in the fluid chamber
Data Source
AI summary
A reservoir for a nebulizer, and a nebulizer with a reservoir in which, to avoid undesirable rises in pressure, a fluid chamber of the reservoir is pre-collapsed and filled with an initial amount of fluid which is less than the maximum volume of the fluid chamber. Preferably, before being filled, the fluid chamber is compressed and/or expanded by means of gas to a defined volume which is less than the maximum volume of the fluid chamber.