Location-Controlled Inhaler for Precise Pulmonary Droplet Dosing
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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 rather than the targeted lung passageways, and require frequent cleaning to prevent blockage and contamination, with inconsistent dose delivery and patient misuse being common issues.
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, featuring a surface tension plate and differential pressure sensors for accurate dose delivery, and includes a laminar flow element for inertial filtering of larger droplets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional aerosol generating devices are used to deliver medication, then the delivery mechanism is simple, but the droplet size is too large and deposits in the mouth and throat rather than reaching the lung passageways
Solution Approach 1:
The device segments the droplet generation process by using an ultrasonic transducer to create a piezoelectric field that vibrates a fluid reservoir, breaking the fluid into fine droplets through mechanical vibration rather than conventional aerosolization. This segmentation approach produces droplets in the 1-5 micron range suitable for deep lung delivery.
Solution Approach 2:
The patent employs ultrasonic mechanical vibration through a piezoelectric transducer to generate droplets. The transducer converts electrical energy to high-frequency mechanical vibrations that agitate the fluid surface, creating consistent fine droplets. This vibration-based mechanism precisely controls droplet size while ensuring delivery to targeted lung passageways.
2Speed
If high velocity droplets are generated to ensure delivery, then the droplets reach the target area, but they deposit in the mouth and throat due to high momentum and kinetic energy
Solution Approach 1:
The device changes the velocity parameter by generating droplets at low ejection speeds through ultrasonic vibration rather than high-pressure aerosolization. The piezoelectric-driven mechanism produces droplets with sufficient velocity for lung delivery but low enough to prevent oral deposition, achieving the optimal velocity range for targeted pulmonary delivery.
3Productivity
If the ejector mechanism is used frequently to deliver medication, then the therapeutic effect is maintained, but the ejector apertures become blocked by deposited drug residue requiring cleaning
Solution Approach 1:
The patent employs a disposable ejector mechanism where the fluid reservoir and aperture plate are designed as single-use components. After a limited number of deliveries or when blockage occurs, the entire ejector assembly is discarded and replaced, eliminating the need for cleaning and maintenance while ensuring consistent performance throughout the device's operational life.
4Quantity of substance
If larger total drug doses are required to achieve desired deposition in targeted areas, then the deposition in lung passageways is sufficient, but the probability of unwanted side effects increases
Solution Approach 1:
The patent replaces conventional mechanical aerosolization systems with a piezoelectric ultrasonic vibration system. This substitution generates droplets with precise size control (1-5 microns) that naturally deposit in the targeted lung passageways without requiring high velocities or large doses, thereby reducing systemic exposure and side effects while maintaining therapeutic efficacy.
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 ensures consistent and verifiable dose delivery to the pulmonary system, minimizing unwanted side effects and preventing blockage, while ensuring that at least 70% of the droplets are in the respirable range, enhancing treatment efficacy.
Implementation Method 1
an ejector mechanism including a piezoelectric actuator and an aperture plate, the aperture plate having a plurality of openings formed through its thickness and the piezoelectric actuator operable to oscillate the aperture plate at a frequency to thereby generate an ejected stream of droplets
Implementation Method 2
at least one differential pressure sensor positioned within the housing; the at least one differential pressure sensor configured to activate the ejector mechanism upon sensing a pre-determined pressure change within the housing
Implementation Method 3
a laminar flow element for inertial filtering of larger droplets
Data Source
AI summary
A method for controlling dosing of droplet delivery device includes providing a droplet delivery device, such as an inhaler, to a user, verifying a location of the user with the droplet delivery device, such as by GPS, and enabling dosing of the drug in droplets ejected from the device based on the verifying of the location of the user.