Dry-Powder Inhaler Manifold Gap Control and Blister Isolation
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Solution Overview
Problem
Existing dry-powder inhalers face challenges in maintaining dosing consistency, leading to risks of under- or over-dosing, and potential device jamming due to medicament loss and contamination, especially when using blister packs for storing medicament doses.
Innovation Solution
The design minimizes the gap between the peeling edge and the manifold by threading the cover sheet through a narrow gap during assembly, isolates used and unused portions of the blister pack to prevent contamination, and uses a unitary molded plastics component for the manifold to control airflow and reduce entrainment of loose medicament, along with a dose counter for precise dosing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gap between the peeling edge and the manifold is made wide to facilitate assembly, then the ease of manufacture is improved, but the risk of medicament loss and dosing inconsistency increases
Solution Approach 1:
The inhaler is divided into separate functional components: the blister pack, the peeling mechanism, and the manifold. This segmentation allows each component to be optimized independently - the gap can be made wide during assembly for ease of manufacture, then minimized in the final assembled product to ensure dosing consistency. The separate components enable precise control over the gap dimension in the assembled configuration.
Solution Approach 2:
The cover sheet is threaded through the gap during the assembly process, performing the necessary positioning action before the final configuration is achieved. This preliminary action allows the gap to be accessible and wide during assembly, while the subsequent assembly steps minimize the gap to the required precision for consistent dosing.
2Manufacturing precision
If the gap is minimized to reduce medicament loss, then the dosing consistency is improved, but the device complexity increases
Solution Approach 1:
The manifold is integrated with the housing as a unitary molded plastics component, merging two functions into one structure. This reduces the number of separate parts and simplifies the overall device architecture while maintaining the ability to minimize the gap between the peeling edge and the manifold for consistent dosing.
Solution Approach 2:
The unitary molded component serves multiple functions: it acts as both the housing structure and the manifold with integrated airflow channels. This multi-functionality reduces device complexity by eliminating separate components while preserving the precise gap control needed for dosing consistency.
3Device complexity
If used and unused portions of the blister pack are not isolated, then the device complexity is reduced, but the risk of contamination and over-dosing increases
Solution Approach 1:
The housing is segmented into distinct compartments that separately contain used and unused portions of the blister pack. This segmentation physically isolates the two portions, preventing contamination between them while maintaining a relatively simple overall device structure through clear compartmentalization rather than complex 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 reduces the risk of medicament loss and contamination, ensures consistent dosing, and enhances the inhaler's reliability by minimizing the risk of under- or over-dosing and device jamming, while allowing for easier accommodation of different medicament formulations.
Implementation Method 1
The airflow passing through the mouthpiece and the manifold entrains the dry-powder medicament contained within the opened blister pocket
Data Source
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AI summary
A method of assembling an inhaler for delivering dry-powder medicament to a patient from an open blister pocket (3) of a blister pack (1), the inhaler comprising: a housing for enclosing used and unused portions of the blister pack (1) together with a medicament dispensing mechanism; and a manifold through which air can be drawn in use of the inhaler, the manifold comprising an air inlet (125) for receiving external air, at least one medicament aperture (127a, 127b) for communicating with an opened pocket (3) of the blister pack (1) to enable entrainment of the medicament by the air drawn through the manifold, and an air outlet (129) for delivery of the entrained medicament to the patient, and a guide surface (117) for guiding the cover sheet (7) of the unused portion of the blister pack (1), wherein the manifold and the guide surface (117) are defined by separate components of the inhaler.