Ejector Closure for Piezoelectric Inhaler Aperture Evaporation Control
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Solution Overview
Problem
Existing inhaler systems produce droplets with high velocities and wide size ranges, leading to deposition in the mouth and throat, require frequent cleaning to prevent blockage, and lack verification of correct dose administration.
Innovation Solution
A piezoelectric actuated droplet delivery device with a housing, reservoir, and an ejector mechanism using a piezoelectric actuator and aperture plate to generate droplets of less than 5 microns, equipped with sensors for activation and inertial filtering to ensure delivery to the pulmonary system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional aerosol generating devices are used, then droplets are generated, but droplet size is too large and velocity is too high causing deposition in mouth and throat rather than reaching distal lung
Solution Approach 1:
The patent changes the physical parameters of droplet generation by using a piezoelectric actuator to create controlled pressure variations, producing droplets with diameters predominantly less than 5 microns and reduced velocity. This parameter change enables droplets to reach distal lung passageways instead of depositing in the mouth and throat.
Solution Approach 2:
The patent replaces conventional mechanical aerosol generation mechanisms (which produce high-velocity, large droplets) with a piezoelectric actuation system. This substitution enables precise control over droplet formation, resulting in smaller, lower-velocity droplets that can penetrate deeper into the pulmonary system.
2Manufacturing precision
If larger total drug doses are required to achieve desired deposition, then more drug is delivered to target areas, but probability of unwanted side effects increases
Solution Approach 1:
The patent incorporates sensors that detect whether a droplet has been successfully inhaled by the patient. This feedback mechanism allows the device to verify correct dose administration and can trigger additional actuations if the dose was not properly delivered, ensuring accurate dosing and preventing both under-dosing and over-dosing side effects.
Solution Approach 2:
The piezoelectric actuation system provides precise control over droplet ejection, enabling accurate delivery of the prescribed dose. This precision mechanical control, combined with sensor feedback, ensures that the correct amount of drug reaches the target area without requiring larger doses that would increase side effect risk.
3Reliability
If frequent cleaning is required to prevent blockage, then device maintenance is performed, but device complexity and time loss increase
Solution Approach 1:
The patent employs a disposable cartridge containing the piezoelectric actuator and aperture plate assembly. After a single use, the entire cartridge is discarded, eliminating the need for cleaning and maintenance of the ejector mechanism. This disposable approach ensures reliable aperture functionality without requiring time-consuming cleaning procedures.
Solution Approach 2:
The patent extracts the ejector mechanism (aperture plate and actuator) as a separate, removable cartridge that can be easily replaced. This extraction allows the critical components to be disposed of after single use, preventing blockage issues without requiring cleaning, while the reusable housing can be简单地 rinsed.
4Measurement precision
If sensors and verification systems are added, then correct dose administration is verified, but device complexity increases
Solution Approach 1:
The patent integrates simple sensors that detect droplet inhalation and provide feedback to the control system. This feedback mechanism verifies whether the correct dose was administered and can trigger appropriate responses (such as indicating successful delivery or prompting re-administration). The feedback system achieves accurate dose verification with minimal added complexity by using straightforward detection and response protocols.
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
Delivers droplets efficiently to the lungs, reduces blockage, and provides verification of correct dose administration, ensuring consistent and accurate delivery.
Implementation Method 1
an ejector mechanism using a piezoelectric actuator and aperture plate to generate droplets
Implementation Method 2
inertial filtering to ensure delivery to the pulmonary system
Data Source
AI summary
An electronic droplet delivery device includes a housing including a mouthpiece located at an airflow exit side of the housing, a fluid reservoir, an aperture plate having a plurality of openings that receives fluid from the reservoir, an electronic actuator that oscillates the aperture plate to generate an ejected stream of droplets, and an ejector closure that opens and closes to help seal and prevent evaporation from the aperture plate when the droplet delivery device is not being used.