Propellant Evaporator for Inhaler Atomization
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Solution Overview
Problem
Current inhaler devices struggle to deliver large, consistent doses of powdered medicinal formulations to the lungs effectively, with deposition often influenced by user inhalation behavior and prone to clumping due to liquid propellants, leading to inefficient lung penetration and high oropharyngeal deposition.
Innovation Solution
A compact handheld device with a propellant-assisted nebulization system that uses an evaporator to convert liquid propellant into gas, reducing clumping and incorporating a straight nozzle and elongated mouthpiece design to enhance aerosol delivery, independent of user inhalation behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If liquid propellant is used directly to atomize powdered formulation, then propellant delivery is simplified, but powder clumping occurs and lung penetration is reduced
Solution Approach 1:
The patent changes the physical state parameter of the propellant from liquid to gas by introducing an evaporator component. This parameter change prevents liquid propellant from causing powder clumping while maintaining effective atomization. The evaporator heats the liquid propellant to convert it into gas phase before it contacts the powdered formulation, thereby resolving the contradiction between simplified delivery and atomization quality.
Solution Approach 2:
The patent applies preliminary action by evaporating the liquid propellant before it contacts the powder. The evaporator is positioned to pre-process the propellant, converting it to gas phase in advance. This preliminary phase change ensures that when the propellant interacts with the powder, it is already in the appropriate gaseous state, preventing clumping and ensuring reliable atomization.
2Productivity
If conventional MDI propellant exits at high speed, then propellant delivery efficiency is improved, but drug is released in coarse form causing high oropharyngeal deposition
Solution Approach 1:
The patent segments the propellant delivery process into distinct stages: liquid propellant storage, evaporation to gas phase, and controlled release through the nozzle. This segmentation allows the propellant to maintain high delivery efficiency while the phase change and controlled expansion ensure the drug is released as fine inhalable particles rather than coarse droplets, reducing oropharyngeal deposition.
Solution Approach 2:
The patent utilizes phase transition of the propellant from liquid to gas in the evaporator. This phase transition enables the propellant to expand and mix with the powder more effectively, creating fine aerosol particles suitable for lung delivery. The gaseous propellant carries the drug in inhalable form rather than coarse liquid droplets, resolving the contradiction between delivery efficiency and inhalable dose quality.
3Device complexity
If passive inhaler relies on user inhalation suction, then device complexity is reduced, but deagglomeration and transport to lungs become highly variable
Solution Approach 1:
The patent applies self-service by using the propellant system to automatically perform the deagglomeration and transport functions that would otherwise require complex mechanical mechanisms. The expanding gaseous propellant self-propels the powdered formulation through the device and into the user's lungs, eliminating the need for complex active mechanisms while ensuring consistent delivery independent of user inhalation variability.
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 device achieves improved lung penetration with a high proportion of particles <5 microns, reducing dependence on user inhalation and increasing the inhalable dose, while minimizing oropharyngeal deposition and facilitating error-free use.
Implementation Method 1
the propellant is fed through an evaporator (6) or heat exchanger
Implementation Method 2
the evaporator causes the propellant, which is liquid in a storage cartridge, for example, to be completely or almost completely converted into the gaseous state
Implementation Method 3
the evaporator causes the propellant, which is liquid in a storage cartridge, for example, to be completely or almost completely converted into the gaseous state
Data Source
AI summary
The apparatus has a vaporizer (6) or heat exchanger for guiding blowing agent i.e. stock cartridge liquid, into a cavity. Atomization is supported by the blowing agent, which is supplied to the cavity in which a measured quantity of formulation is provided. The vaporizer comprises an inlet for blowing agents, and an outlet. The vaporizer is provided with multiple heat exchange elements in the cavity, where components of the vaporizer are made of metal. Metal balls and/or metal wires form the heat exchange elements. A nozzle channel comprises an inlet cone and/or an outlet cone.