Nebulizer Aerosol Detection via Light Attenuation
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Solution Overview
Problem
Current nebulizers face damage due to continuous vibration when medical liquid is exhausted, as existing liquid level detection methods fail for foamy liquids, leading to inaccurate liquid level detection and subsequent damage to the nebulizing module.
Innovation Solution
A nebulizer equipped with a light detection circuit that continuously emits light signals to the aerosol path to calculate an aerosol amount index, outputting a warning signal when the index falls below a stop threshold, ensuring the nebulizing module stops vibrating when the medical liquid is depleted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a detection electrode is used to detect liquid level in the medicine cup, then the liquid level can be detected, but the detection fails when foam is present in the medicine cup during vibration
Solution Approach 1:
The patent introduces an intermediary detection mechanism - using light transmission through the cup bottom to detect aerosol presence indirectly. Instead of directly detecting liquid level with an electrode (which fails with foam), the system uses a light source and photodetector arrangement where light passes through the cup bottom and its attenuation indicates aerosol generation, serving as an indirect mediator to infer liquid consumption status.
Solution Approach 2:
The patent replaces the mechanical/electrical detection electrode system with an optical detection system. The electrode-based liquid level detection is substituted by light-based aerosol detection, where a light source emits light through the cup bottom and a photodetector measures light intensity changes, converting a mechanical contact method into a non-contact optical method that is not affected by foam.
2Productivity
If the nebulizing module continues to vibrate after medical liquid is exhausted, then the device can maintain operation, but the nebulizing module is damaged
Solution Approach 1:
The patent implements a feedback control mechanism where the light detection system continuously monitors aerosol presence and provides real-time feedback to the control circuit. When the photodetector detects light intensity changes indicating aerosol generation has stopped (meaning liquid is exhausted), the control circuit receives this feedback signal and automatically stops the nebulizing module vibration, preventing damage while allowing continuous operation during normal use.
Solution Approach 2:
The patent employs preliminary detection action by continuously monitoring aerosol generation status before liquid exhaustion causes damage. The light detection system proactively detects the transition from aerosol generation to no aerosol (indicating liquid depletion) before the nebulizing module can be damaged by dry running, allowing preventive shutdown action to be taken.
3Measurement precision
If light signals are continuously emitted to detect aerosol amount, then accurate liquid level detection can be achieved, but additional detection components are required
Solution Approach 1:
The patent applies multi-functionality by designing the light detection system to serve multiple purposes: the same light source and photodetector arrangement detects both aerosol presence (indicating liquid consumption) and can potentially measure aerosol generation rate. The cup bottom with light-transmitting properties serves both as a structural component and as a light transmission medium for detection, reducing the need for separate dedicated detection components.
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
Accurate detection of aerosol amount and medical liquid level reduces the likelihood of nebulizing module damage by preventing continuous vibration when the liquid is exhausted, enhancing the therapeutic effectiveness and longevity of the device.
Implementation Method 1
continuously emitting, by a light detection circuit, a plurality of light signals to an aerosol path of the nebulizer for obtaining a plurality of light intensity values
Data Source
AI summary
An aerosol amount detection method and a nebulizer are provided. The aerosol amount detection method includes: continuously emitting, by a light detection circuit, a plurality of light signals to an aerosol path of the nebulizer for obtaining a plurality of light intensity values; calculating, by a control circuit, an aerosol amount index of the aerosol path according to the plurality of light intensity values; and outputting, by the control circuit, a warning signal when the aerosol amount index continues to be less than a stop threshold for a first check time.