Smoking Substitute Air Seal With Gurney Flap for Aerosol Size Control
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Solution Overview
Problem
Existing smoking substitute systems inefficiently deliver nicotine to the lungs due to inappropriate aerosol droplet sizes, with large particles depositing in the mouth and upper respiratory tract, and small particles being exhaled without delivering nicotine.
Innovation Solution
A smoking substitute apparatus with an air seal featuring a Gurney flap and specific airflow configurations to control aerosol particle size, ensuring efficient delivery of nicotine to the lungs by adjusting airflow velocity, turbulence, and cooling rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If aerosol droplets are made small (sub-micron) for lung inhalation, then aerosol can be inhaled into the lungs, but the particles are exhaled without delivering nicotine to the lungs
Solution Approach 1:
The invention optimizes aerosol droplet size parameters to fall within the 1-10 µm range, specifically targeting a median diameter (Dv50) of 2-5 µm. This parameter optimization ensures particles are large enough to deposit in the lungs via impaction and sedimentation, yet small enough to be inhaled deep into the respiratory tract, resolving the contradiction between inhalability and deposition efficiency
Solution Approach 2:
The patent implements feedback control through sensors that monitor aerosol generation in real-time and adjust heating power and airflow rate accordingly. This closed-loop control maintains aerosol droplet sizes within the optimal 1-10 µm range, ensuring reliable nicotine delivery while adapting to varying user inhalation patterns and environmental conditions
2Reliability
If aerosol droplets are made large for lung delivery, then particles can be deposited in the lungs, but the particles are deposited in the mouth and upper respiratory tract instead
Solution Approach 1:
The invention precisely controls aerosol droplet size parameters to fall within the 1-10 µm range, with a median diameter (Dv50) of 2-5 µm. This optimized parameter range prevents premature deposition in the oral cavity by ensuring particles are sufficiently small to remain suspended during oral passage, while still large enough to deposit efficiently in the lungs through impaction and sedimentation
Solution Approach 2:
The system dynamically adjusts aerosol generation parameters including heating power, airflow rate, and liquid delivery rate in real-time. This dynamic control adapts aerosol droplet size and velocity to ensure optimal deposition location, preventing large particles from depositing in the mouth while maintaining sufficient size for lung delivery efficiency
3Quantity of substance
If heating power is increased to produce more aerosol, then nicotine concentration in aerosol increases, but aerosol particle size becomes too large and deposits in upper respiratory tract
Solution Approach 1:
The system dynamically balances heating power and airflow rate to maintain optimal aerosol characteristics. When heating power is increased to raise nicotine concentration, the airflow rate is simultaneously increased to prevent excessive droplet coalescence and size growth. This dynamic parameter coordination ensures high nicotine concentration is achieved without producing oversized particles that would deposit in the upper respiratory tract
Solution Approach 2:
The invention optimizes multiple parameters simultaneously including heating power, airflow rate, liquid delivery rate, and chamber pressure. By coordinating changes in these parameters, the system achieves high nicotine concentration in the aerosol while maintaining droplet sizes within the 1-10 µm range, preventing premature deposition in the oral cavity and upper respiratory tract
4Speed
If airflow velocity is increased to deliver aerosol faster to lungs, then nicotine delivery speed increases, but aerosol particles are exhaled before deposition
Solution Approach 1:
The invention optimizes airflow velocity parameters to fall within a specific range that balances delivery speed and deposition efficiency. The airflow rate is controlled to provide sufficient velocity to transport aerosol particles deep into the lungs quickly, while not exceeding the threshold that would cause particles to be exhaled before deposition. This optimal velocity range ensures rapid nicotine delivery while maintaining reliable absorption efficiency
Solution Approach 2:
The system uses sensors to monitor aerosol generation and airflow characteristics in real-time, providing feedback control that adjusts heating power and airflow rate to maintain optimal delivery conditions. This feedback mechanism ensures that airflow velocity remains within the range that maximizes lung deposition while minimizing exhalation of undelivered particles, adapting to varying user inhalation patterns
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 apparatus achieves controlled aerosol particle sizes between 1 µm and 10 µm, improving nicotine absorption in the lungs and user satisfaction by enhancing aerosol interaction with the respiratory system.
Implementation Method 1
adjusting airflow velocity, turbulence, and cooling rate
Implementation Method 2
achieves controlled aerosol particle sizes
Implementation Method 3
a vaporisation chamber with inlet and outlet configured to receive an air flow and configured to vaporise an aerosol precursor
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Provided is a smoking substitute apparatus with an air seal positioned between a holder which retains a heatable wick and an aerosol delivery conduit for guiding aerosol from the holder region to the user's mouth. The air seal has, at the end farthest from the wick, an inwardly projecting Gurney flap.