Inhaler Capsule Cavity and End Cap Air Channel Design
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Solution Overview
Problem
Dry powder inhalers often fail to deliver nicotine particles effectively to the lungs at conventional smoking regime inhalation or air flow rates, are complex to operate, and may involve moving parts, making them inconvenient for users.
Innovation Solution
An inhaler article with a capsule cavity and end cap design that promotes stable capsule rotation within the inhaler body, utilizing a non-parallel air channel to induce swirling airflow, which aids in the uniform release of nicotine particles over multiple inhalations, and includes a porous support element to maintain airflow and resemble a conventional cigarette in form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dry powder inhalers are designed to deliver nicotine particles to the lungs, then nicotine delivery is achieved, but the device becomes complex to operate and may involve moving parts
Solution Approach 1:
The inhaler is divided into separate functional components: a removable cartridge containing the nicotine powder and a separate inhalation mechanism. This segmentation allows the complex inhalation mechanism to remain simple while the cartridge handles powder storage and delivery, reducing overall operational complexity.
Solution Approach 2:
The nicotine powder is extracted into a separate replaceable cartridge that can be independently handled. This extraction simplifies the main inhaler body, removing the need for complex powder handling mechanisms and reducing the number of moving parts in the primary device.
2Productivity
If dry powder inhalers deliver entire nicotine dose in a single breath, then complete dose delivery is achieved, but the device may not be suitable for conventional smoking regime inhalation rates
Solution Approach 1:
The inhaler is designed to dynamically adapt to different inhalation rates. The airflow channel geometry and capsule cavity dimensions are optimized to maintain effective nicotine particle delivery across a range of inhalation velocities, allowing both single-breath and conventional smoking regime usage patterns to achieve complete dose delivery.
Solution Approach 2:
The device parameters including airflow channel cross-sectional area, capsule cavity volume, and nicotine powder particle size are specifically designed to allow the system to function effectively across varying inhalation flow rates, enabling adaptability from rapid single-breath inhalation to slower conventional smoking patterns.
3Stability of the object's composition
If capsule cavity is sized to accommodate capsule, then stable rotation is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The capsule and cavity are designed with intentional asymmetric features including an off-center airflow channel entry point and non-uniform cavity cross-section. These asymmetric elements create stable rotational motion through aerodynamic forces while providing built-in alignment cues that reduce the need for tight manufacturing tolerances.
Solution Approach 2:
The capsule cavity employs curved surfaces and rounded transitions rather than sharp edges or flat surfaces. The cavity cross-section varies smoothly along the length, creating gentle aerodynamic guides that promote stable capsule rotation while being more tolerant of manufacturing variations compared to precision-machined geometric forms.
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 delivers nicotine particles uniformly over multiple inhalations at conventional smoking airflow rates, mimicking the experience of smoking a conventional cigarette while being simple to manufacture and use, with the design ensuring reliable airflow and capsule rotation for efficient particle delivery.
Implementation Method 1
An air channel extending along the end cap and being non-parallel with the longitudinal axis may advantageously initiate the 'swirling' air flow through the capsule cavity
Implementation Method 2
having the capsule and capsule cavity sized to the described dimensions may promote rotation of the capsule in the capsule cavity as air flows through the capsule cavity. Advantageously, the rotation is a stable rotation and the axis of rotation may be substantially coextensive with the longitudinal axis of the inhaler body
Implementation Method 3
The porous support element may be a filter element. Airflow from the capsule cavity may flow through the porous support element to the mouthpiece end
Data Source
AI summary
An inhaler article includes a body extending along a longitudinal axis from a mouthpiece end to a distal end and a capsule cavity defined within the body. The capsule cavity has a length extending along the longitudinal axis. A mouthpiece air channel extends from the capsule cavity to the mouthpiece end. An end cap is disposed within the distal end and extends to the capsule cavity. The end cap includes an air channel extending from the end cap distal end to the end cap inner end. A capsule is disposed within the capsule cavity and has a capsule length. The capsule length is in a range from about 25% to about 99% of the cavity length, or about 50% to about 95% of the cavity length, or about 70% to about 90% of the cavity length, or from about 75% to about 85% of the cavity length, or about 80% of the cavity length.