Vibrating Mesh Nebulizer with Breath-Synchronized Pulsing
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Solution Overview
Problem
Conventional electrical nebulizers lack control over medicament delivery, leading to inefficiencies and inconsistencies in aerosol particle size, resulting in increased mass median aerodynamic diameter (MMAD) and geometric standard deviation (GSD), which affects the therapeutic efficacy of respiratory treatments.
Innovation Solution
A nebulizer system with a vibrational diaphragm design that maintains aerosol particle size and incorporates breath-actuated operation, data tracking, and communication interfaces to optimize medicament delivery, ensuring optimal MMAD and GSD within the 1-4.5 micron range with minimal particle loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional electrical nebulizers continuously generate aerosolized medicament, then medicament delivery is maintained, but aerosol particle size control deteriorates and MMAD increases
Solution Approach 1:
The nebulizer employs periodic pulsing action instead of continuous operation. The controller delivers aerosolized medicament in controlled pulses synchronized with patient breathing cycles, which maintains therapeutic delivery while improving particle size consistency by preventing particle accumulation and collision that occurs during continuous generation.
2Manufacturing precision
If mesh size is optimized for 1-4.5 μm particles, then aerosol generation is improved, but particle collision increases resulting in larger MMAD
Solution Approach 1:
By using periodic pulsing rather than continuous aerosol generation, the system allows time between pulses for aerosol particles to disperse and be inhaled, preventing particle accumulation and subsequent collisions that would lead to aggregation and increased MMAD.
Solution Approach 2:
The system dynamically adjusts the pulsing frequency and duration based on patient breathing patterns detected by the flow sensor, optimizing particle delivery timing to minimize collisions while maintaining effective medicament administration.
3Ease of operation
If nebulizer operates without control, then operation is simple, but medicament delivery consistency deteriorates
Solution Approach 1:
The nebulizer system automatically detects patient breathing patterns through the flow sensor and self-regulates the pulsing frequency and duration without requiring manual intervention. This maintains ease of operation while ensuring consistent medicament delivery tailored to each patient's respiratory needs.
Solution Approach 2:
The system incorporates a flow sensor that provides real-time feedback on patient breathing, allowing the controller to adjust aerosol delivery parameters dynamically. This feedback mechanism ensures consistent and reliable medicament delivery while maintaining simple operation for the patient.
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 system provides a more controllable and consistent medicament delivery, minimizing aerosol particle collisions and optimizing the MMAD and GSD, thereby enhancing the therapeutic effectiveness and efficiency of respiratory treatments.
Implementation Method 1
a high speed vibrating mesh element residing in a tubular housing. The rapid vibration forces the liquid medicament, through the vibrating mesh element
Data Source
AI summary
A nebulizer system includes a body having a fluid chamber and an aerosol chamber, and a vibrator assembly positioned at an interface between the fluid chamber and the aerosol chamber. The vibrator assembly may include a diaphragm, having a fluid side and an aerosol side, defining a plurality of perforations between the fluid side and the aerosol side, and one or more vibrator elements operatively associated with the diaphragm to vibrate the diaphragm to produce aerosolized medicament projected into the aerosol chamber from the plurality of perforations. Each perforation of the plurality of perforations projects the aerosolized medicament along a respective projection path relative to a plane defined by the aerosol side of the perforation, the one or more vibrator elements or the diaphragm support substrate further being configured to angularly displace the aerosol side of the diaphragm to sweep the direction of at least one projection path.