Breath-Actuated Oscillating Actuator for Dry Powder Inhaler Dispersion
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Solution Overview
Problem
Dry powder inhalers face a trade-off between efficiency and complexity, with simpler designs delivering less than 30% of the nominal dose to the deep lung and more complex designs risking increased deposition within the device, while lacking user feedback on correct usage.
Innovation Solution
A compact, breath-actuated powder dispersion mechanism with an oscillating actuator within a dispersion chamber that provides audio feedback, promoting efficient particle dispersion across various doses, and minimizing unintended deposition through specific geometry and flow profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simpler inhaler flow path is used, then device complexity is reduced, but powder dispersion efficiency decreases (less than 30% of nominal dose delivered to deep lung)
Solution Approach 1:
The patent employs an oscillating element that vibrates or oscillates within the dispersion chamber to enhance powder dispersion. This mechanical vibration breaks up powder aggregates and promotes more uniform distribution of powder particles throughout the inhalation flow, thereby improving dispersion efficiency without requiring a complex flow path geometry.
Solution Approach 2:
The oscillating element performs periodic motion within the dispersion chamber, creating repeated cycles of powder disruption and redistribution. This periodic action ensures thorough mixing and dispersion of the powder over multiple cycles, achieving high dispersion efficiency even with a relatively simple overall device structure.
2Productivity
If a more complex internal flow path is used, then powder dispersion efficiency increases (up to 40% of nominal dose), but device contamination increases due to increased deposition within the inhaler
Solution Approach 1:
The patent extracts the dispersion function from the flow path geometry itself and concentrates it in a dedicated oscillating element within a simplified dispersion chamber. By separating the dispersion mechanism from the flow path design, the system achieves high dispersion efficiency without the flow path complexity that would otherwise cause increased powder deposition and device contamination.
Solution Approach 2:
The oscillating element provides visual or audible feedback to users indicating proper inhalation technique, ensuring users inhale at the correct rate and depth. This feedback mechanism optimizes powder delivery efficiency while the simple flow path design minimizes contamination, as users learn to operate the device correctly through the feedback signal.
3Device complexity
If traditional inhaler designs are used, then device simplicity is maintained, but user feedback on correct usage is absent
Solution Approach 1:
The oscillating element generates visual or audible feedback signals that inform users whether they are inhaling at the correct rate and depth. This feedback mechanism is integrated into the oscillation system itself, providing usage guidance without requiring separate complex feedback subsystems, thus maintaining device simplicity while eliminating the loss of usage information.
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 solution effectively delivers a higher percentage of the nominal dose to the deep lung, reduces device contamination, and provides user feedback on correct inhalation technique, enhancing both efficiency and usability.
Implementation Method 1
an actuator that is movable within the dispersion chamber along a longitudinal axis... causes the actuator to oscillate along the longitudinal axis, enabling the oscillating actuator to effectively disperse powdered medicament
Implementation Method 2
A geometry of the inhaler may be such that a flow profile is generated within the dispersion chamber that prevents or at least minimizes unintended deposition or accumulation of powder within the chamber
Data Source
AI summary
A dry powder inhaler includes a powder storage element configured to hold a powdered medicament and an inlet channel receives powdered medicament from the powder storage element that is entrained in an airflow. The inlet channel has a first diameter and defines an opening. The inhaler includes a dispersion chamber that receives the airflow and the powdered medicament from the opening. The dispersion chamber has a second diameter. The inhaler includes an actuator housed within the dispersion chamber. The actuator oscillates within the dispersion chamber when exposed to the airflow to deaggregate the powdered medicament entrained by the airflow passing through the dispersion chamber. A ratio between the first diameter and the second diameter is between about 0.40 and 0.60 such that an audible sound is produced as the actuator oscillates. The inhaler includes an outlet channel through which the airflow and powdered medicament exit the inhaler.