Nebulizer Dosing Plunger with Overflow Chamber
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Solution Overview
Problem
Existing dosing systems for nebulizers lack flexibility and accuracy in dispensing small volumes of liquid, particularly for sensitive health conditions, and often lead to overdosing due to design flaws that allow excess liquid to be inadvertently re-administered or misinterpreted by users.
Innovation Solution
A dosing system with a filling chamber, reservoir chamber, and a plunger mounted on a hinge, where the plunger displaces liquid into a reservoir and overflow chamber, preventing accidental re-administration of excess liquid by hiding it from the user and ensuring accurate metering through a curved design and detent mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an overflow chamber is used to retain excess liquid, then dosing precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the overflow chamber and reservoir chamber into a single integrated chamber structure. The overflow chamber receives excess liquid while the reservoir chamber supplies liquid to the aerosol generator, both functions performed within one chamber rather than separate components, thereby reducing device complexity while maintaining dosing precision
Solution Approach 2:
The chamber serves multiple functions simultaneously: it acts as both an overflow chamber for retaining excess liquid and a reservoir chamber for supplying liquid to the aerosol generator. This multi-functionality eliminates the need for separate chambers, reducing overall device complexity while ensuring precise dosing through the overflow mechanism
2Measurement precision
If a plunger forms a seal with the filling chamber to displace liquid, then dosing accuracy is improved, but ease of operation deteriorates due to material and component requirements
Solution Approach 1:
The patent removes the sealing requirement from the plunger system by extracting the seal component entirely. Instead of requiring the plunger to form a seal with the filling chamber, the design allows the plunger to simply displace liquid mechanically, eliminating material compatibility constraints and simplifying operation
Solution Approach 2:
The plunger is designed as a simple disposable component that does not require durable sealing materials or complex maintenance. By eliminating the seal, the plunger can be made from simpler, less expensive materials that are easier to manufacture and replace, improving ease of operation
3Ease of operation
If excess liquid is visible to the user after dosing, then ease of operation is improved, but harmful factors increase due to potential overdosing
Solution Approach 1:
The patent extracts the excess liquid from the user's view by routing it into the overflow chamber which is positioned away from the user interface. The excess liquid is retained in a location that is not visible or accessible to the user, eliminating the confusion that could lead to overdosing while maintaining simple operation
Solution Approach 2:
The overflow chamber acts as an intermediary that receives and isolates excess liquid between the filling chamber and the user. This intermediate structure prevents direct contact or visual confirmation of excess liquid by the user, thereby eliminating the harmful effect of potential overdosing while keeping the system easy to operate
Data Source
AI summary
The invention provides a dosing system for an inhalation device, comprising a filling chamber (10); a reservoir chamber (31) which supplies liquid (3) to an aerosol generator (301); and a plunger (20) which includes an overflow chamber (25) and which is pivotable about a hinge (50). The filling chamber has an inner wall (12) which is higher on the side adjacent to the hinge than on the opposite side. When the filling chamber is filled with liquid and the plunger is pivoted into the filling chamber, part of the liquid is displaced over the lower side (17) of the inner wall into the reservoir chamber and some or all of the remaining liquid is displaced into the overflow chamber. The invention also provides an inhalation device comprising the dosing system and a method for dosing liquid to the inhalation device.