Humidifier Water Quantity Detection Using Existing Airflow Sensors
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Solution Overview
Problem
Existing respiratory therapy devices and humidifiers suffer from discomfort, poor fit, high cost, and lack of patient compliance due to inadequate humidification and difficulty in monitoring water levels in the humidifier reservoir.
Innovation Solution
A method and apparatus for determining the quantity of water in a humidifier reservoir using sensors to measure properties such as pressure, flow rate, and noise, and a controller to adjust humidification based on these measurements, ensuring adequate humidification and patient comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water level monitoring is added to humidifier, then patient compliance improves, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by using existing sensors (flow sensors, pressure sensors, temperature sensors) already present in the respiratory therapy system to perform dual purposes: their primary functions plus water level detection. For example, the flow sensor measures both patient breathing flow and, through correlation analysis, infers water level in the humidifier reservoir. This eliminates the need for separate dedicated water level sensors, thereby improving patient compliance through reliable monitoring without significantly increasing device complexity.
2Device complexity
If indirect measurement methods are used for water level detection, then device complexity is reduced, but measurement precision decreases
Solution Approach 1:
The patent implements feedback mechanisms where the controller continuously receives data from sensors (flow rate, pressure, temperature, noise) and uses correlation analysis to infer water level. The system compares measured parameters against expected patterns and adjusts its assessment accordingly. This feedback loop compensates for the indirect nature of measurement, maintaining sufficient precision for clinical purposes while avoiding complex direct sensing mechanisms.
Solution Approach 2:
By making existing sensors serve multiple functions (primary sensing plus water level detection through correlation), the patent reduces device complexity while maintaining measurement adequacy. The multi-functional sensors provide redundant information that, when processed through correlation algorithms, achieves sufficient measurement precision for monitoring water levels without requiring dedicated high-precision water level sensors.
3Measurement precision
If multiple sensors are used for comprehensive measurement, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent leverages existing sensors in the respiratory therapy system (flow sensors, pressure sensors, temperature sensors, noise sensors) to perform multiple functions. These sensors are already part of the system for monitoring patient parameters, and the patent extends their utility to include water level detection through correlation analysis of their readings. This approach improves measurement precision by utilizing multiple data sources without adding dedicated sensors for each measurement function.
Solution Approach 2:
The patent merges the function of water level detection with existing sensor functions. Instead of separate dedicated sensors for water level, the system combines analysis of flow rate, pressure, temperature, and noise sensor data to infer water level. This merging reduces the total number of components while achieving comprehensive measurement through data fusion and correlation algorithms.
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
Improves patient compliance by maintaining optimal humidification levels and comfort during respiratory therapy, reducing discomfort and enhancing the effectiveness of respiratory treatments.
Implementation Method 1
sensors to measure properties such as pressure, flow rate, and noise
Implementation Method 2
sensors to measure properties such as pressure, flow rate, and noise
Implementation Method 3
controller to adjust humidification based on these measurements
Data Source
AI summary
Methods of an apparatus determine a quantity of a body of water in a humidifier such as by indirect measurement. The quantity of water may be determined by measuring one or more properties or characteristics, from which the quantity of water may be inferred. Characteristics of a flow of air, the humidifier, and/or the body of water may be measured. The characteristics may be, for example, pressure, flow rate, noise, vibration, temperature, electrical or mechanical. These may be measured by one or more sensors, which may be located in the humidifier, RPT device, air circuit or the patient interface. The methods described may have advantages, for example in being able to detect the quantity of water without requiring sensors to be present in a disposable component, and in some cases, without introduction of additional sensors.