Offset Piercing Element for Stable Dry Powder Inhaler Aperture
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Solution Overview
Problem
Dry powder inhalers often fail to provide consistent and uniform delivery of dry powder particles to the lungs due to complex operation, moving parts, and unpredictable aperture formation in capsules, leading to variable airflow rates and dosing.
Innovation Solution
An inhaler system with a single offset piercing element that forms a stable and uniform aperture in the capsule, ensuring balanced piercing force and reliable dry powder delivery by orienting the piercing element parallel to but offset from the capsule's central axis, facilitating repeatable and predictable dosing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional piercing element is used to pierce the capsule, then the capsule can be activated, but the aperture tends to reclose and the piercing location varies leading to non-uniform dry powder delivery
Solution Approach 1:
The piercing element is positioned offset from the central longitudinal axis of the capsule at a specific radial distance (0.5mm to 2.0mm). This asymmetric positioning creates a consistent hinge point on the capsule wall that prevents aperture reclosing and ensures uniform aperture formation with each piercing action, eliminating the variability associated with random piercing locations
Solution Approach 2:
The invention changes the positional parameter of the piercing element from the conventional central axis location to an offset position. This parameter change (radial offset distance) fundamentally alters the piercing mechanics to create a stable hinge point, transforming the unreliable aperture formation into a predictable and consistent process
2Device complexity
If a single piercing element is positioned on the central axis, then the design is simple, but the piercing force is unbalanced causing bending moments and unpredictable aperture formation
Solution Approach 1:
The piercing element is deliberately positioned asymmetrically (offset) from the central longitudinal axis of the capsule at a controlled radial distance. This asymmetric configuration balances the piercing force distribution across the capsule wall, eliminating bending moments and ensuring consistent, reliable aperture formation without increasing device complexity
Solution Approach 2:
The invention moves the piercing element positioning from the one-dimensional central axis to a two-dimensional offset position in the radial direction. This dimensional change allows the piercing force to be applied at an optimal location that balances the capsule wall stress, improving piercing consistency while maintaining simple device design
3Productivity
If dry powder inhalers are designed to deliver entire dose in single breath, then dosing efficiency is improved, but the device becomes complex to operate and may involve moving parts
Solution Approach 1:
The offset piercing element design enables the capsule to self-stabilize during piercing through the formation of a hinge point on the capsule wall. This self-service mechanism eliminates the need for complex moving parts or multi-step operations, allowing the device to reliably deliver the entire dose in a single breath while maintaining operational simplicity
Solution Approach 2:
The offset piercing element performs the aperture formation action in advance with a single, reliable piercing motion. This preliminary action ensures the capsule is properly activated before the user begins inhalation, eliminating the need for complex sequential operations and enabling simple, efficient dosing delivery
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 single offset piercing element configuration ensures reliable and uniform dry powder delivery over multiple inhalations, improving the quality and consistency of the aperture formed, thus enhancing the inhaler's performance and user experience.
Implementation Method 1
a piercing element comprising only a single shaft extending from a fixed end to a tip along a piercing element longitudinal axis
Data Source
Figure 1~2
Figure 3A
Figure 3B~4
AI summary
An inhaler system includes a housing defining a housing cavity, a sleeve extending along a sleeve longitudinal axis and positioned within the housing cavity, a capsule is contained within the sleeve and having a capsule longitudinal axis, and a piercing element having only a single shaft extending from a fixed end to a tip along a piercing element longitudinal axis, the piercing element longitudinal axis being parallel with and offset from the capsule longitudinal axis. Only a single aperture is formed in the capsule by the piercing element.