Nebulizer Actuator Pulsed Control for Output Precision
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Solution Overview
Problem
Conventional nebulizers using piezoelectric elements and mesh nebulizing systems face inefficiencies in output rate control and noise generation, with audible tones indicating changes in output rate and potential flooding issues affecting medication delivery precision.
Innovation Solution
Implementing a pulsed operation mode for the nebulizer actuator, where the actuator is periodically actuated and then at rest, allowing for sound measurement to indicate performance and adjust operating parameters to maintain optimal output rate, including center frequency and burst repetition rate, to maximize efficiency and control medication delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the piezoelectric element is driven with a continuous sine wave, then the nebulizer operates smoothly, but the output rate control precision and efficiency are insufficient
Solution Approach 1:
The patent applies periodic pulsed driving signals instead of continuous sine waves to drive the piezoelectric element. The burst signal pattern (periodic on/off cycles) creates audible tones that correlate with output rate while reducing overall energy consumption. The pulsed operation allows the system to achieve effective nebulization with intermittent energy input rather than continuous power consumption.
Solution Approach 2:
The patent utilizes parameter changes in the driving signal (frequency, burst repetition rate, duty cycle) to optimize the balance between output rate and power consumption. By adjusting these parameters, the system can operate at different efficiency points, selecting optimal settings that maximize productivity while minimizing energy loss.
2Productivity
If the piezoelectric element and mesh are spaced by a fixed distance, then the device structure is simple, but the efficiency in terms of output rate and input power is suboptimal
Solution Approach 1:
The patent optimizes the fixed spacing parameter between the piezoelectric element and mesh to specific values (e.g., 0.5mm to 2.0mm) that maximize efficiency. Rather than making the spacing adjustable (which would increase complexity), the invention identifies optimal fixed spacing values that achieve high efficiency for the pulsed driving mode.
3Quantity of substance
If the mesh becomes flooded with liquid, then the liquid storage is sufficient, but the output rate decreases and the audible tone volume changes
Solution Approach 1:
The patent uses the audible tone produced by the nebulizer as a feedback signal to monitor the flooding state of the mesh. Changes in tone volume indicate changes in output rate caused by flooding. This acoustic feedback allows the system to detect when the mesh is flooded and adjust operating parameters accordingly to maintain optimal performance.
4Productivity
If a pulsed signal is used to drive the piezoelectric element, then the efficiency improves and audible tones are produced, but the noise has tonal quality which may be undesirable
Solution Approach 1:
The patent adjusts the burst repetition rate and duty cycle parameters to control the characteristics of the audible tone. By optimizing these parameters, the system achieves maximum efficiency while managing the tonal noise output. The specific pulse pattern parameters can be selected to minimize perceptible noise while maintaining high productivity.
Data Source
AI summary
There is provided a method of operating a nebulizer, the method comprising controlling an actuator in the nebulizer to operate in a pulsed operation mode; measuring the sound produced by the nebulizer during operation; and using the measurement of the sound as an indication of the performance of the nebulizer. A control unit for a nebulizer that is configured to perform this method is also described.