Dose Counting Mechanism for Metered Dose Inhaler
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Solution Overview
Problem
Existing inhalers for respiratory disorders suffer from complex counting mechanisms that are prone to metering errors, making it difficult for patients to accurately track the remaining medicine dosage, which can lead to critical situations during breathing difficulties or asthma attacks.
Innovation Solution
A dose counting mechanism featuring a resilient element with a central elongate member, displaceable arms, a wheel formation with ratchet and bevel gears, and a pointer system that accurately counts and displays the remaining doses on a linear scale, ensuring precise tracking of medicine availability without errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex mechanical counters with rotary locking are used to count doses, then the counting function is provided, but the device complexity increases and metering errors occur
Solution Approach 1:
The counting mechanism is segmented into distinct functional components: a ratchet wheel for unidirectional counting, a pawl for engagement, a pointer for indication, and a scale for display. Each component has a specific function, and together they provide reliable counting without the complexity of rotary locking mechanisms. The segmentation allows for simpler individual parts that are easier to manufacture and less prone to error.
Solution Approach 2:
The patent replaces complex mechanical rotary locking counters with a simpler ratchet-based mechanical system. The ratchet wheel and pawl provide a more reliable and simpler alternative to rotary locking mechanisms, reducing the number of components and potential failure points while maintaining counting accuracy.
2Reliability
If rotary locking counters are used to track medicine dosage, then dose counting is enabled, but the system becomes susceptible to malfunctioning
Solution Approach 1:
The patent extracts the essential counting function from complex rotary locking mechanisms and implements it through a simplified ratchet-based system. By taking out only the necessary counting capability and removing unnecessary complexity, the system achieves both reliability and ease of operation. The ratchet mechanism provides robust counting that is resistant to malfunction while remaining simple to operate.
Solution Approach 2:
The counting mechanism is designed as a simple, disposable component integrated into the inhaler canister. Rather than using complex, reusable rotary locking counters, the patent employs a simpler counting system that can be easily manufactured and replaced with each new canister, ensuring reliability without complexity.
3Measurement precision
If complex counting mechanisms are employed in inhalers, then dose tracking is provided, but metering errors increase
Solution Approach 1:
The patent applies local quality by providing a dedicated scale with clear numerical markings positioned near the pointer for easy reading. The scale is specifically designed to display dose information clearly and locally, without requiring complex display mechanisms. This localized, simple display system improves measurement precision while avoiding the complexity of electronic or mechanical display systems.
4Device complexity
If simple counting mechanisms are used, then device complexity is reduced, but counting accuracy may compromise
Solution Approach 1:
The ratchet mechanism provides inherent feedback through its toothed structure, ensuring that each dose count is registered reliably. The pawl engages with the ratchet teeth to prevent backward movement, providing mechanical feedback that ensures accurate counting. This simple feedback mechanism maintains counting accuracy without adding complexity.
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 mechanism provides a simple, error-free way to count and indicate the remaining medicine dosage, ensuring patients always have access to their medication when needed, enhancing safety and reliability.
Implementation Method 1
a resilient element having a central elongate member, resiliently displaceable arms extending on either side of the central elongate member
Implementation Method 2
a wheel formation having a ratchet wheel formation surrounding an axle integral to the wheel formation
Implementation Method 3
a first bevel gear formation on the other operative side, such that in the operative configuration of the dose counting mechanism the wheel formation is positioned on the outer surface of the wall with the ratchet wheel proximal to the outer surface of the wall and the first bevel gear distal from the outer surface of the wall
Implementation Method 4
an elongate threaded element having a second bevel gear formation extending from an operative lower end of the elongate threaded element and configured to engage the first bevel gear
Data Source
AI summary
A dose counting mechanism for indicating the quantity of dosage available within a metered dose inhaler having a canister with an aerosol fluid and a housing body for housing the canister, wherein a wall of the housing body includes formations to support a resilient element, a wheel formation, a elongate threaded element, and a threaded formation including a pointer. The depressing of the canister to release aerosol fluid displaces the resilient element which engages with the wheel formation to rotate the wheel formation. The elongate threaded element engages with the wheel formation such that the rotation of the wheel formation causes rotational movement of the elongate element. The threaded formation engages with the elongate element whereby the rotational movement of the elongate element causes the linear displacement of the threaded formation and the pointer, whereby the position of the pointer indicates the quantity of fluid within the canister.