Dry Powder Inhaler Cartridge with Aerodynamic Vortex Dispersion
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Solution Overview
Problem
Existing inhalers face challenges in being disposable, safe from contamination, easy to use, economically viable, and effective in dispersing drug particles to less than 5 μm for pulmonary or nasal delivery, while avoiding mechanical complexity and powder leakage.
Innovation Solution
A dry powder inhaler design featuring a powder cartridge with compartments that transform into a dispersion chamber, using air flow to break up agglomerates and ensure efficient delivery, eliminating the need for separate storage and dispersion chambers, and incorporating aerodynamic features to regulate airflow and prevent powder leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a disposable inhaler design is used to prevent contamination, then safety and hygiene are improved, but device complexity and manufacturing cost increase due to the need for separate storage and dispersion chambers
Solution Approach 1:
The patent combines the storage chamber and dispersion chamber into a single integrated chamber. The mouthpiece acts as both the dispersion chamber and the pathway for inhalation, eliminating the need for separate storage and dispersion chambers. This integration maintains the disposable safety feature while significantly reducing device complexity and manufacturing cost.
2Device complexity
If simple straw design is used for powder delivery, then device simplicity is improved, but powder dispersion efficiency decreases resulting in lower dose deposition in the lung
Solution Approach 1:
The patent incorporates a vortex generator that creates turbulent airflow and vortex patterns when the patient inhales. This mechanical vibration and turbulence effect breaks up powder agglomerates and enhances dispersion efficiency, ensuring adequate dose delivery to the lungs while maintaining device simplicity.
3Speed
If fast delivery of entire dose is used, then delivery speed is improved, but powdery mouth effect increases and reduces therapeutic efficacy
Solution Approach 1:
The patent uses the patient's natural inhalation cycle to control powder delivery. The vortex generator creates periodic turbulent flow patterns that match the inhalation rhythm, delivering the powder in a controlled manner over the duration of the breath rather than all at once. This periodic action prevents the powdery mouth effect while maintaining adequate delivery speed for therapeutic efficacy.
4Measurement precision
If pre-metered doses are used in asthma inhalers, then dosing precision is improved, but adaptability to deliver large doses decreases
Solution Approach 1:
The patent employs a dynamic dosing system where the powder cartridge can be rotated to align different compartments with the mouthpiece. This allows the device to adaptively deliver different pre-metered doses (e.g., 100 mcg, 200 mcg, 400 mcg) based on patient needs, combining dosing precision with dose flexibility for treating exacerbations or different severity levels.
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 inhaler achieves efficient dispersion and deposition of drug particles, is simple and cost-effective, and ensures safety and hygiene by preventing contamination and powder leakage, while maintaining high therapeutic efficacy with a user-friendly design.
Implementation Method 1
the dispersion and entrainment of the dose occur simultaneously in a very short period of time—a fraction of one second
Implementation Method 2
disperse agglomerates of drug particles and excipients down to their original, inhalable size of less than 5 μm
Implementation Method 3
the dispersion and entrainment of the dose occur simultaneously in a very short period of time
Implementation Method 4
the very fine and freely flowing powder does not appear to be prevented from flowing out through the ventilation holes of the device
Data Source
AI summary
A dry powder inhaler for pulmonary or nasal use, comprising at least an inhaler body and a cartridge with one or more compartments each containing one dose of a drug. The compartment has holes to admit air and holes to deliver powder, which, in use, communicate with an inhalation channel in the inhaler body. To prevent the powder from leaking through the compartment holes before use, the air admission holes are of reduced dimension, thereby blocking or hindering powder exit under the force of gravity. When the cartridge is inserted inside the inhaler body, all its holes can be blocked. By sliding the cartridge in relation to the body until the inhalation position is reached, the holes come into in fluid communication with one another and with the inhalation channel, thereby allowing a flow of air to disperse and entrain the dose through the mouthpiece. Five embodiments are disclosed.