Angled Discharge Channel for Droplet Refinement in Inhalation Devices
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Solution Overview
Problem
Inhalation devices face challenges in generating and delivering sufficiently fine droplets, particularly in portable devices without electrical components, where pressure is limited, and droplets tend to agglomerate due to air resistance before reaching the airways.
Innovation Solution
The design features a discharge head with a nozzle arrangement and an angled discharge channel, along with an aperture or liquid buffer, which allows the droplet mist to be deflected and burst into finer droplets during inhalation, preventing agglomeration and enabling adjustable dispensing modes and droplet sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a nozzle arrangement without mechanically movable parts is used to generate droplet mist, then the device structure is simplified and portability is improved, but the droplet size becomes dependent on liquid pressure which is difficult to exceed 5 bar in mobile devices, resulting in insufficiently fine droplets
Solution Approach 1:
The patent introduces a second dimension to droplet refinement by deflecting the spray jet at an angle (15-45 degrees) relative to the discharge channel axis. This angular deflection creates a multi-dimensional droplet processing path where droplets are not only atomized by the nozzle but also further refined through angled discharge and potential secondary atomization in the discharge channel, overcoming the limitation of single-stage nozzle atomization at low pressures.
Solution Approach 2:
The patent introduces an intermediary element - the angled discharge channel - that mediates between the nozzle arrangement and the user's airways. This discharge channel acts as an intermediate processing stage where droplets can be further atomized, deflected, and refined before reaching the user, effectively extending the droplet refinement process beyond the nozzle itself.
2Manufacturing precision
If droplets are delivered at higher pressure to achieve finer droplet size, then droplet fineness is improved, but air resistance causes droplets to agglomerate into larger droplets before reaching the airways
Solution Approach 1:
The patent employs periodic action through the user's natural inhalation cycles. During inhalation, the user's breath provides periodic airflow that drives droplets through the discharge channel and prevents agglomeration. The angled discharge channel design works in conjunction with this periodic inhalation action to maintain droplet separation and fineness throughout the delivery process.
Solution Approach 2:
The patent substitutes high-pressure mechanical atomization with a lower-pressure system combined with aerodynamic refinement. Instead of relying solely on high pressure to create fine droplets, the system uses the user's inhalation airflow (aerodynamic force) to further atomize and refine droplets as they pass through the angled discharge channel, replacing the need for high-pressure mechanical systems.
3Productivity
If the discharge channel is aligned with the dispensing direction for efficient droplet delivery, then delivery efficiency is improved, but droplets cannot be effectively deflected or refined during inhalation
Solution Approach 1:
The patent introduces asymmetry by angling the discharge channel (15-45 degrees) relative to the spray jet axis rather than aligning them perfectly. This asymmetric arrangement creates a deliberate misalignment that enables droplet deflection and secondary atomization during inhalation, while still maintaining sufficient delivery efficiency through optimized angular geometry.
Solution Approach 2:
The patent changes the geometric parameter of the discharge channel orientation from 0 degrees (aligned) to 15-45 degrees (angled). This parameter change transforms the discharge channel from a simple delivery conduit into an active droplet refinement element that utilizes the angled geometry to enhance droplet atomization and prevent agglomeration during inhalation.
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
This configuration ensures that most droplets are delivered in a fine mist, with larger droplets being deflected, improving inhalation efficiency and allowing for adaptable dispensing options based on user needs and symptoms.
Implementation Method 1
the liquid is pressurized manually or by a pressure accumulator and is fed to a nozzle arrangement that generates the droplet mist
Implementation Method 2
a nozzle arrangement for generating the droplet mist in the form of a spray jet
Implementation Method 3
on account of the air resistance, the released droplets of the generated droplet mist tend to agglomerate into larger droplets
Implementation Method 4
a liquid buffer which, for example, can be formed by a pore-like structure and stores the liquid temporarily until its evaporation
Data Source
AI summary
An inhalation device having a reservoir for storing liquid before being discharged, and a discharge head for dispensing the liquid in droplet mist. The discharge head has a nozzle arrangement for generating the droplet mist and housing on which a discharge channel is provided for use as a respiration piece or for attachment of a separate respiration piece. A main axis of extent of the discharge channel encloses an angle of >0° with a central dispensing direction. In alignment with the central dispensing direction of the nozzle arrangement, either an aperture is provided in the housing through which aperture the droplet mist emerges from the discharge head if it is not sucked into the discharge channel by respiration of the user, or a liquid buffer is provided for receiving the droplet mist if it is not sucked into the discharge channel by respiration of the user.