Magnetic Indicator for Opaque Dispensing Container Level
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Solution Overview
Problem
Pressurized liquid dispensing containers, particularly in the medical field, pose a challenge in determining the remaining liquid content, as they are opaque and lack dose counters, leading to users running out of medication or wasting unused contents.
Innovation Solution
A system utilizing a reference card with a visual scale and colored segments, along with a marker that indicates the liquid level, allowing users to accurately assess the contents of the container by aligning the marker with corresponding colored segments to determine if the container is full, empty, or nearly empty.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the dispensing container is made opaque from impact extruded aluminium or rolled and welded sheet steel, then the container achieves structural strength and durability, but the quantity of liquid in the container cannot be determined by visual observation
Solution Approach 1:
A magnetic indicator is introduced as an intermediary element that responds to the liquid level through magnetic field interaction. The indicator is positioned on the outer surface of the opaque container and visually indicates liquid quantity without requiring the container material to be transparent, thus resolving the contradiction between opacity for strength and visibility for information.
2Device complexity
If no dose counter is provided in the inhaler, then the device complexity is reduced, but the user cannot accurately determine when the inhaler is empty or nearly empty
Solution Approach 1:
The system utilizes the existing magnetic properties of the liquid propellant to automatically activate and position the magnetic indicator based on liquid level. This self-service mechanism provides measurement functionality without requiring external power sources, complex electronics, or manual operation, thus maintaining low device complexity while achieving accurate measurement.
3Device complexity
If the container relies on traditional approximation methods such as shaking, weighing, or observing spray quality, then no additional measurement components are needed, but the accuracy of liquid content determination is insufficient
Solution Approach 1:
Traditional mechanical approximation methods (shaking, weighing, spray observation) are replaced with a magnetic field-based indication system. The magnetic indicator responds to the liquid level through magnetic attraction without requiring mechanical interaction, providing significantly improved measurement precision while maintaining simplicity.
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
Enables users to order replacements before depletion and utilize the remaining contents effectively, reducing waste and ensuring proper medication dosage.
Implementation Method 1
The indicator is responsive to a magnetic field generated by the liquid propellant
Data Source
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Figure 5a~5b
AI summary
The present invention provides a system for approximating the contents of a dispensing container, the system comprising: a dispensing container comprising a vessel, the vessel having: a formation and/or a discreet element in or on the vessel which causes the centre of gravity of liquid contents of the vessel to be positioned differently, when oriented in a lain-on side attitude, from its notional position, in the absence of the formation and/or discreet element, and an indicator configured to indicate a change of the liquid contents of the vessel; a gauge, separate to the dispensing container, configured to be co-operable with the indicator of the dispensing container, the gauge comprising an interface between the gauge and the dispensing container and a scale which, in co-operation with the indicator of the dispensing container, signifies to a user the approximate liquid contents of the vessel.