Inhaler Indexing Wheel Drive Mechanism
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Solution Overview
Problem
Conventional inhaler devices require complex mechanisms for indexing and piercing blisters, which can be cumbersome and inefficient, especially when trying to align and pierce multiple blisters for sequential use.
Innovation Solution
A modified drive mechanism that couples the actuator or cap to an indexing wheel, allowing the indexing wheel to rotate during part of the actuator's movement, then disengaging to prevent further rotation, ensuring efficient alignment and piercing of blisters without unnecessary mechanical engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a complex indexing mechanism is used to align and pierce multiple blisters sequentially, then the device can hold and process multiple doses, but the mechanism becomes cumbersome and inefficient
Solution Approach 1:
The indexing mechanism is segmented into discrete elements (indexing wheel with notches, individual blister positions) that work together in a modular fashion. Each notch on the indexing wheel corresponds to a specific blister position, allowing the mechanism to process multiple doses through simple sequential steps rather than a complex continuous system
Solution Approach 2:
The indexing wheel acts as an intermediary component that mediates between the user's rotation action and the blister piercing mechanism. It translates continuous rotation into discrete positioning steps, each corresponding to a specific blister, thereby simplifying the overall control mechanism while enabling sequential processing of multiple doses
2Measurement precision
If the indexing wheel rotates continuously with actuator movement, then positioning is achieved, but unnecessary mechanical engagement occurs reducing efficiency
Solution Approach 1:
The indexing wheel engagement is made periodic rather than continuous. The drive mechanism engages the indexing wheel only at specific intervals corresponding to the rotation positions where blister piercing is required. This periodic engagement eliminates unnecessary mechanical contact during other phases of actuator movement, reducing friction and mechanical wear while maintaining precise alignment when needed
Solution Approach 2:
The drive mechanism transitions from a static continuous engagement to a dynamic selective engagement system. The mechanism automatically engages and disengages based on the actuator's rotation position, adapting the mechanical connection to the specific operational phase. This dynamic behavior optimizes both alignment precision during engagement and operational efficiency during disengagement
Data Source
AI summary
An inhaler is disclosed. It comprises a housing to receive a strip having a plurality of blisters, each blister having a breachable lid and containing a dose of medicament for inhalation by a user, an indexing wheel mounted in the housing rotatable to drive a strip to sequentially move blisters into alignment with a blister piercing member, a control element pivotally mounted to the housing and a drive mechanism configured to couple the control element to the indexing wheel during part of the rotation of the control element by a user so that the indexing wheel rotates together with the control element.