Non-Coaxial Dose Counter for Inhaler Reliability
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Solution Overview
Problem
Existing dose counters for inhalers often fail to reliably count a single dose, are not sturdy enough for daily use, and struggle with manufacturing variations, leading to inaccuracies and instability, particularly when carried in bags or pockets.
Innovation Solution
A compact dose counter design using non-coaxial, non-parallel rotatable indicators at an obtuse angle, eliminating the need for transfer gears and allowing for stable mounting within the inhaler's actuator, with conical surfaces facilitating easy integration and clear digit display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional dose counter designs are used, then the counting mechanism can be implemented, but the reliability of dose counting is insufficient and may not reliably count a single dose
Solution Approach 1:
The dose counter is divided into two separate rotatable indicators (first count indicator and second count indicator) with different rotational axes, where each indicator tracks a portion of the dosage count. This segmentation allows the system to achieve reliable counting without requiring a single complex indicator mechanism, thereby improving reliability while managing complexity.
Solution Approach 2:
The patent introduces a second rotational dimension by adding a second count indicator with a rotational axis that is not coaxial, parallel, or perpendicular to the first axis. This multi-dimensional approach distributes the counting function across different spatial dimensions, enhancing reliability by providing redundant counting paths while avoiding the need for complex transfer mechanisms.
2Volume of moving object
If compact dose counter designs are used, then the counter can be integrated into the inhaler housing, but the stability and sturdiness may be insufficient for daily use and carrying
Solution Approach 1:
By dividing the counter into two separate indicators with distinct rotational axes, each indicator can be independently mounted and optimized for structural stability. This segmentation allows each component to be smaller and more easily integrated into the housing while maintaining overall structural strength through distributed mounting points.
Solution Approach 2:
The patent employs conical surfaces (first conical surface and second conical surface) as indicia bearing surfaces on the rotatable indicators. These curved conical surfaces are more resistant to mechanical stress and deformation compared to flat surfaces, thereby enhancing the structural strength and durability of the compact counter design while maintaining a space-efficient form factor.
3Ease of manufacture
If traditional aligned indicator designs are used, then the manufacturing process can be simplified, but the design cannot compensate for manufacturing variations in valve stem length and travel
Solution Approach 1:
The patent employs two rotatable indicators with flexible rotational coupling rather than rigid fixed alignments. This dynamic design allows the indicators to self-adjust and compensate for manufacturing variations in valve stem length and travel distance, as the rotational mechanism can accommodate slight variations in actuation timing without requiring precise pre-alignment during manufacturing.
Solution Approach 2:
The two-indicator system provides inherent feedback compensation: the first indicator tracks the primary dosage count while the second indicator, with its different rotational axis, provides a secondary verification that can compensate for variations. This feedback mechanism allows the system to maintain manufacturing precision without requiring extremely tight tolerances in the manufacturing process.
4Volume of moving object
If the dose counter is made compact for integration, then it minimizes interference with inhaler performance, but the readability and ease of viewing the count may be reduced
Solution Approach 1:
By positioning the two count indicators at different spatial orientations with non-coaxial, non-parallel, and non-perpendicular rotational axes, the patent creates a three-dimensional display arrangement. This multi-dimensional positioning allows both indicators to be viewed simultaneously from a common viewing area, providing clear readability while maintaining a compact overall footprint that minimizes interference with inhaler performance.
Data Source
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AI summary
This application discloses a dose counter for use in connection with a device adapted for metered dispensing of a medication. The dose counter has a first count indicator that has a first indicia bearing surface, with the first count indicator being rotatable about a first axis. The dose counter also has a second count indicator that has a second indicia bearing surface, with the second count indicator being rotatable about a second axis. The second axis is disposed at an obtuse angle with respect to the first axis, and the first and second indicia bearing surfaces align at a common viewing area to collectively present at least a portion of a medication dosage count.