Inhaler Airflow Path Design for Resistance and Leakage Control
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Solution Overview
Problem
Existing inhalers face challenges in providing sufficient inhalation resistance, preventing unintended leakage of functional material powder, securing a long airflow path without increasing device size, and maintaining aesthetics while reducing needle contamination.
Innovation Solution
The inhaler design includes a housing with a mouthpiece, a holder with a capsule accommodation space, and an airflow path comprising multiple segments to ensure sufficient resistance, prevent leakage, and maintain aesthetics, while a needle is protected to reduce contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the airflow path is extended to provide sufficient inhalation resistance, then the inhalation resistance is improved, but the device size increases
Solution Approach 1:
The airflow path is nested within the holder structure by forming the path through the holder walls and internal structures. The holder serves dual purposes: containing the capsule and providing the airflow path, thereby extending the airflow path length without increasing external device dimensions.
Solution Approach 2:
The airflow path utilizes three-dimensional space within the holder by extending in multiple directions (longitudinal, width, and depth directions) rather than simply lengthening a linear path. This allows sufficient path length while maintaining compact external dimensions.
2Ease of operation
If the lower inlet hole is positioned to lead into the capsule, then the functional material powder can be delivered, but aesthetics are compromised due to exposure
Solution Approach 1:
The lower inlet hole is extracted from the external housing surface and repositioned to the internal holder structure. This removes the aesthetic concern of an exposed hole on the external surface while maintaining its functional connection to the capsule through the holder's internal architecture.
Solution Approach 2:
The holder acts as an intermediary structure that connects the external environment to the capsule interior. The airflow path through the holder mediates between the external air intake and the capsule contents, allowing functional material delivery while keeping the holder's external surface aesthetically pleasing.
3Ease of operation
If the needle protrudes toward the capsule accommodation space, then the capsule can be punctured for material delivery, but needle contamination increases
Solution Approach 1:
The needle is positioned and protected within the holder structure before use. The holder provides a controlled environment that protects the needle from contamination until the moment of capsule puncture, at which point the needle is precisely positioned to pierce the capsule seal.
Solution Approach 2:
The holder structure serves as an intermediary that protects the needle from external contamination while allowing it to perform its function. The needle operates within the controlled internal environment of the holder, reducing exposure to contaminants while still enabling capsule puncture.
Data Source
AI summary
An inhaler is configured to include a capsule containing a functional material. The inhaler includes a housing including a first surface, a second surface opposite to the first surface, and a side surface between the first surface and the second surface, a mouthpiece, wherein at least a portion of the mouthpiece protrudes from the first surface of the housing in a longitudinal direction from the first surface to the second surface, a holder accommodated in the housing and comprising a capsule accommodation space, and a needle coupled to the mouthpiece and protruding toward the capsule accommodation space, wherein a tip of the needle is insertable into the capsule accommodation space.