Inhaler External Drive Gear Isolation
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Solution Overview
Problem
Conventional inhalation devices for medicament delivery in powdered form often require frequent blister insertion and maintenance, which can be inconvenient and expose the medicament to environmental factors that affect delivery characteristics.
Innovation Solution
An inhaler design featuring a housing with a rotatable blister strip drive member and actuating lever, where the drive gear and gear element are isolated from the chamber to prevent powder deposition and are protected by a cap, allowing for sequential blister alignment and puncture without direct user contact or exposure to environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drive gear and drive gear element are disposed inside the chamber, then the mechanism can directly drive the blister strip, but the powder may deposit on the drive mechanism affecting its operation
Solution Approach 1:
The drive gear and drive gear element are extracted from the chamber interior and disposed on the outside of the housing. This separates the powder-containing environment from the drive mechanism, preventing powder deposition while maintaining the driving function through external gear engagement with the blister strip.
Solution Approach 2:
The patent introduces an intermediary arrangement where the drive gear element engages the blister strip through the housing wall or via a transmission mechanism. This allows power transmission without direct contact between the drive gear and powder, using the housing structure as a mediator to transfer motion while isolating the mechanism from contamination.
2Ease of manufacture
If the blister strip drive member is rotatably mounted in the chamber, then sequential blister alignment is achieved, but the mechanism is exposed to environmental factors and powder
Solution Approach 1:
The housing is segmented into separate compartments: the chamber containing the medicament and blister strip, and the external area containing the drive mechanism. This segmentation allows the rotatable drive member to function while being physically separated from the medicament environment, preventing exposure to harmful factors.
Solution Approach 2:
The drive gear and associated mechanisms are extracted from the chamber environment and positioned externally. The blister strip drive member remains rotatably mounted to achieve sequential alignment, but the power transmission components are removed from the powder-containing zone, eliminating environmental exposure risks.
3Reliability
If the drive mechanism is isolated from the chamber, then powder deposition is prevented, but the mechanism requires external protection and mounting
Solution Approach 1:
The housing serves multiple functions: it contains the chamber, provides structural support, acts as a barrier between the powder and drive mechanism, and facilitates the transmission of motion from the external drive gear to the internal blister strip. This multi-functionality reduces the need for additional protective components, offsetting the increased structural requirements.
Solution Approach 2:
The housing structure is merged with the drive mechanism mounting, integrating the protective enclosure and the drive system into a unified structure. The housing wall itself serves as the mounting surface for the drive gear, eliminating the need for separate protective housings or complex mounting arrangements.
Data Source
AI summary
An inhaler comprising a housing defining a chamber to receive a strip having a plurality of blisters each containing a dose of medicament for inhalation by a user is disclosed. It comprises an actuating lever and a blister strip drive member rotatably mounted in the chamber to sequentially move each blister into a blister opening position. The blister strip drive member and the actuating lever comprise a drive gear and a drive gear element, respectively, that cooperate to effect rotation of the blister strip drive member in response to rotation of the actuating lever. The drive gear and drive gear element are disposed on the outside of the housing remote from the chamber.