External Wick Vaporization for Lung-Targeted Aerosol Delivery
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Solution Overview
Problem
Existing smoking substitute systems face inefficiencies in delivering nicotine to the lungs, with large aerosol droplets being deposited in the mouth and upper respiratory tract, and small droplets being exhaled without delivery, leading to the need for longer puffs or higher nicotine concentrations. Additionally, there are issues with liquid leakage and high manufacturing costs of single-use consumables.
Innovation Solution
A smoking substitute apparatus with a wick that generates aerosol particles outside the airflow path, using a base to heat the wick externally, eliminating the need for an internal heater, and incorporating a liquid-impermeable base to prevent leakage, allowing aerosol droplets to grow to a suitable size for lung delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If aerosol is generated inside the airflow path, then nicotine delivery is achieved, but aerosol droplets are too small and are exhaled without reaching the lungs
Solution Approach 1:
The wick is extracted from the airflow path and positioned in a separate vaporization chamber. Airflow bypasses the wick externally, allowing aerosol generation in a stagnant environment. This separation enables droplets to grow to optimal size (1-5 μm) before being entrained in the airflow for lung delivery, resolving the contradiction between nicotine delivery efficiency and droplet size control.
2Productivity
If an internal heater is used to heat the wick, then aerosol generation is achieved, but manufacturing costs increase and device complexity increases
Solution Approach 1:
A base is introduced as an intermediary component between the heater and the wick. The heater heats the base, which then conducts heat to the wick indirectly. This intermediary approach simplifies heater integration, reduces device complexity, and eliminates direct contact between the heater and aerosol-generating components, while maintaining effective aerosol generation.
3Quantity of substance
If the base is permeable to liquid, then liquid flow is facilitated, but liquid leakage occurs
Solution Approach 1:
The base is constructed from porous material that facilitates liquid flow from the reservoir to the wick through capillary action. The porous structure allows controlled liquid transport while the overall design prevents leakage by maintaining the wick outside the airflow path and using the base as both structural support and liquid transport medium.
4Quantity of substance
If aerosol droplets are large, then they are deposited in the mouth and upper respiratory tract, but if they are small, they are exhaled without delivery
Solution Approach 1:
The wick is positioned in a stagnant vaporization chamber away from the airflow path, allowing aerosol droplets to form and grow to optimal size (1-5 μm) before being entrained in the airflow. This preliminary droplet growth phase ensures that when droplets enter the airflow, they are already at the correct size for lung delivery, preventing both premature deposition and exhalation loss.
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 efficiently delivers nicotine to the lungs with optimized aerosol droplet sizes and reduces waste and manufacturing costs by eliminating the need for an internal heater, while minimizing leakage and enabling recyclability.
Implementation Method 1
a heatable portion of the wick, in use, delivers aerosol particles into a flow passage
Implementation Method 2
a wick extending from the liquid storage reservoir and into the vaporization chamber
Implementation Method 3
a base in contact with the heatable portion of the wick and arranged to receive a heater that is configured to heat the heatable portion of the wick via the base
Implementation Method 4
incorporating a liquid-impermeable base to prevent leakage
Data Source
AI summary
A smoking substitute system is provided. The apparatus comprises a housing having an air inlet; an outlet communicating with the air inlet through a flow passage; a liquid reservoir to store an aerosol precursor; and a vaporization chamber to generate an aerosol from the aerosol precursor. The vaporization chamber delivers aerosol and is in communication with the flow passage. A wick extends from the liquid reservoir into the vaporization chamber. The wick comprises a heatable portion disposed outside of an air flow path along the flow passage, such that air flowing through the flow passage bypasses the heatable portion of the wick. A base is in contact with the heatable portion of the wick to receive a heater configured to heat the heatable portion of the wick to generate the aerosol. The device comprises a heater and removably engages with the apparatus via the base.