Mist Inhaler Ultrasonic Transducer Frequency Optimization
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Solution Overview
Problem
Conventional mist inhaler devices, particularly ultrasonic nebulizers, are ineffective with viscous suspensions and tend to heat medications, destroying their therapeutic benefits, and often deposit particles in the oropharyngeal region rather than deeper in the lungs, limiting their therapeutic effectiveness.
Innovation Solution
A mist inhaler device with a sonication chamber and capillary element using an ultrasonic transducer to atomize liquids without heating, driven by an AC driver with a processor-controlled frequency optimization to maximize active power, utilizing a capillary element made from bamboo fibers for efficient liquid delivery and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ultrasonic transducer frequency is increased to improve atomization efficiency, then particle size decreases and lung deposition improves, but power consumption increases
Solution Approach 1:
The patent implements dynamic frequency adjustment by sweeping through a range of frequencies (2.5-3.5 MHz) and automatically selecting the optimal frequency that maximizes atomization efficiency while minimizing power consumption. The system continuously adapts the transducer operating frequency based on real-time performance feedback, resolving the contradiction between particle size control and energy usage.
Solution Approach 2:
The system changes the operating parameters of the ultrasonic transducer by varying frequency within a specified range rather than operating at a fixed frequency. This parameter optimization allows the device to achieve the desired particle size distribution for lung deposition while operating at the most energy-efficient frequency point.
2Productivity
If conventional ultrasonic nebulizers are used to atomize viscous suspensions, then atomization is achieved, but the medication is heated and therapeutic benefits are destroyed
Solution Approach 1:
The patent replaces thermal heating mechanisms with pure mechanical ultrasonic vibration at controlled frequencies. By using mechanical vibration energy rather than thermal energy to achieve atomization, the system maintains medication integrity while achieving efficient atomization of viscous suspensions.
Solution Approach 2:
The system employs periodic ultrasonic vibrations at specific frequencies (2.5-3.5 MHz) to atomize the medication. This periodic mechanical action achieves atomization through controlled vibration cycles rather than continuous heating, preventing thermal degradation of therapeutic compounds.
3Device complexity
If jet nebulizers are used to deliver medication, then device simplicity is maintained, but droplets are large and deposit in oropharyngeal region rather than lungs
Solution Approach 1:
The patent employs mechanical vibration of the ultrasonic transducer at high frequencies (2.5-3.5 MHz) to generate fine aerosol droplets. This mechanical vibration mechanism produces consistently small droplet sizes suitable for lung deposition while maintaining a relatively simple device structure, overcoming the limitations of jet nebulizers.
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 device achieves efficient atomization of medications, reducing power consumption and avoiding thermal damage, with a higher percentage of particles smaller than 1 micron for improved lung deposition and prolonged device usage due to enhanced fluid retention and antimicrobial properties.
Implementation Method 1
an ultrasonic transducer configured to vibrate the atomisation surface to atomise a liquid carried by the capillary element to generate a mist comprising the atomised liquid and air
Implementation Method 2
a capillary element extending between the liquid chamber and the sonication chamber such that a first portion of the capillary element is within the liquid chamber and a second portion of the capillary element is within the sonication chamber
Data Source
AI summary
A mist inhaler device (200) for generating a mist including a therapeutic for inhalation by a user. The device includes a mist generator device (201) and a driver device (202). The driver device (202) is configured to drive the mist generator device (201) at an optimum frequency to maximise the efficiency of mist generation by the mist generator device (201).