Dry Powder Inhaler Locking Mechanism for Dosing Accuracy
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Solution Overview
Problem
Dry powder inhalers often allow users to meter multiple doses unintentionally or intentionally without inhaling previous doses, leading to incorrect medication delivery, either too much or too little medication being administered.
Innovation Solution
The development of a dry powder medicament inhaler featuring a locking mechanism that prevents further dosing until a previous dose is inhaled, a dosage indicator to signal readiness for inhalation, and an incorrect dose prevention mechanism with a pivotable counterweight to prevent accidental activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is implemented to prevent multiple dosing, then dosing accuracy is improved, but device complexity increases
Solution Approach 1:
The locking mechanism is integrated with the dosage mechanism itself, combining the dosing function and the locking function into a single unified system. The dosage mechanism includes both the dose metering capability and the locking feature that prevents further dosing until inhalation occurs, thereby improving dosing accuracy without proportionally increasing overall device complexity.
Solution Approach 2:
The locking mechanism operates automatically based on the state of the dosage mechanism. When a dose is metered, the system self-locks to prevent additional dosing. The mechanism self-resets when inhalation is detected, eliminating the need for manual user intervention to enable or disable the locking function, thus maintaining simplicity while ensuring accuracy.
2Reliability
If a locking mechanism prevents further dosing until inhalation, then medication safety is improved, but ease of operation deteriorates
Solution Approach 1:
The locking mechanism incorporates a feedback system that detects whether inhalation has occurred. The system continuously monitors the inhalation state and automatically adjusts the locking status accordingly - locked when no inhalation has occurred, unlocked when inhalation is detected. This feedback-driven operation ensures medication safety while maintaining ease of use, as the user simply needs to inhale to reset the mechanism without needing to understand or manually control the locking function.
3Loss of information
If a dosage indicator is added to show readiness for inhalation, then user awareness is improved, but device complexity increases
Solution Approach 1:
The dosage indicator utilizes color changes to communicate the readiness state for inhalation. A visual indicator element changes color or displays different colors based on whether a dose is ready to be inhaled, providing clear and immediate user awareness. This color-based communication method conveys critical information effectively while adding minimal structural complexity to the device.
Solution Approach 2:
The indicator system uses a simplified visual representation (color display) to convey the complex state of the dosage mechanism. Rather than requiring users to understand the mechanical state of the locking mechanism, the system creates a simple visual copy or representation of the ready/not-ready state, making the information accessible and actionable for users without increasing mechanical complexity.
4Reliability
If an incorrect dose prevention mechanism is implemented, then dosing reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The incorrect dose prevention mechanism is merged with the existing locking mechanism and dosage mechanism. The same locking components that prevent multiple dosing also serve to prevent incorrect dosing by ensuring that doses can only be administered when properly metered and when inhalation is detected. This integration approach improves dosing reliability without requiring separate, additional manufacturing processes or components.
Solution Approach 2:
The locking mechanism serves multiple functions simultaneously: it prevents multiple dosing, ensures inhalation has occurred, and prevents incorrect dose administration. By designing a universal mechanism that performs multiple safety functions through a single integrated system, the patent achieves high dosing reliability while minimizing manufacturing complexity compared to implementing separate mechanisms for each safety function.
Data Source
AI summary
A dry powder medicament inhaler for metering an inhalation of dry powdered medicament may include at least one inlet and at least one outlet, wherein a communication between said inlet and outlet at least includes a mixing and deaggregation chamber and at least two dosage communications between the inlet and the chamber. The inhaler may also include a dosage mechanism for arranging at least one dose of a medicament between the inlet and the chamber, such that said at least one dose may be delivered upon inhalation at said outlet through said communications. The inhaler may further include a locking mechanism, wherein on moving the dosage mechanism from a dose collecting position to a dose administering position the locking mechanism may be moved from an unlocked to a locked position preventing the metering of any further doses prior to resetting of the locking mechanism. Instead of a locking mechanism, the inhaler may include a dosage indicator or a counterweight mechanism. The inhaler may also include combinations of a locking mechanism, a dosage indicator, and a counterweight mechanism.