Inhaler Discharge Passageway Moisture Control
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Solution Overview
Problem
Drug delivery systems, such as metered dose inhalers (MDIs) and dry powder inhalers, face issues with the deposition and accumulation of medicament within the discharge passageway due to moisture infiltration, leading to inconsistent delivery and reduced effectiveness over time.
Innovation Solution
The implementation of a seal member to selectively isolate the discharge passageway when not in use and the integration of a desiccant material to reduce moisture content within the system, ensuring consistent delivery and extending the product's usable life by minimizing moisture-related fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge passageway is left open for aerosol delivery, then the device can function properly, but moisture infiltrates and causes medicament deposition
Solution Approach 1:
A desiccant material is placed within the discharge passageway to preemptively absorb moisture before it can cause medicament deposition. This preliminary protective action occurs during storage and non-use periods, preventing the harmful effect before it manifests
Solution Approach 2:
The desiccant material serves as a consumable component that depletes over time and can be replaced with canister changes. This disposable approach provides continuous moisture protection without requiring complex reusable systems
2Reliability
If a seal member is added to isolate the discharge passageway, then moisture control is improved, but device complexity increases
Solution Approach 1:
The discharge passageway is segmented into functional zones: an upstream portion containing the desiccant material for moisture absorption, and a downstream portion for aerosol delivery. This segmentation allows targeted moisture control without sealing the entire passageway
Solution Approach 2:
The harmful moisture is extracted from the discharge passageway environment through the desiccant material, which actively absorbs and removes water vapor. This extraction approach protects the medicament without requiring physical barriers
3Reliability
If desiccant material is integrated into the system, then moisture-related fouling is reduced, but manufacturing complexity increases
Solution Approach 1:
The desiccant material is combined with the canister or discharge passageway structure to form an integrated assembly. This merging eliminates separate moisture control components and simplifies the overall manufacturing process
Solution Approach 2:
The desiccant material serves multiple functions: absorbing moisture during storage, protecting against hygroscopic medicament deposition, and extending product usable life. This multi-functionality reduces the need for separate protective mechanisms
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
This approach significantly reduces the deposition of medicament within the discharge passageway, ensuring consistent shot weight and extending the product's shelf life by maintaining moisture control throughout its usable life, without compromising the operation or user experience of the inhaler.
Implementation Method 1
exposing the discharge passageway to a desiccant material to remove moisture therefrom
Data Source
AI summary
Systems and methods for isolating and/or desiccating a portion of a drug delivery tract of a drug delivery apparatus to reduce water vapor content therein are provided. For example, there is provided a metered dose inhaler for delivering aerosolized medicament or other matter to a user. The aerosolized medicament or other matter may be discharged from a discharge passageway within the inhaler into an inhalation passageway for inhalation by a user, and the inhaler may comprise a seal member operative to selectively isolate the discharge passageway from the inhalation passageway and external environment during inactivity. The inhaler may further comprise a desiccant material arranged to withdraw moisture from the isolated discharge passageway. In other instances, desiccant material may be arranged to withdraw moisture from the discharge passageway of the inhaler without isolating the discharge passage during inactivity.