Respiratory Gas Humidifier Optical Sensing for Water-Level Detection
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Solution Overview
Problem
Conventional humidifiers for respiratory gases face challenges in accurately detecting the state of the water reservoir, leading to complexity and high manufacturing costs due to malfunctioning float-valves or blocked water supplies, which can result in insufficient humidity levels during mechanical ventilation.
Innovation Solution
A sensor system using electromagnetic radiation with variable intensity and gain settings to determine the state of the humidification chamber, allowing for distinct output signals to be compared against threshold values, distinguishing between full, low, and absent water levels, and triggering alarms or automatic refilling/replacement as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional float-valve mechanisms are used to detect water levels, then water level detection is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces the mechanical float-valve detection system with an optical sensor system using electromagnetic radiation. The transmitter emits radiation through the chamber wall, and the receiver detects the radiation pattern to determine water presence and level, eliminating mechanical moving parts while achieving reliable detection.
Solution Approach 2:
The patent introduces electromagnetic radiation as an intermediary between the water reservoir and the detection system. The radiation passes through the chamber wall and interacts with the water, providing information about water level and presence without direct mechanical contact or complex internal sensors.
2Reliability
If multiple sensor configurations with varying intensity and gain settings are implemented, then detection reliability improves, but device complexity increases
Solution Approach 1:
The patent implements dynamic adjustment of transmitter intensity and receiver gain settings based on detected conditions. The system varies these parameters in response to different water levels and detection scenarios, optimizing performance while using a single sensor pair rather than multiple fixed configurations.
Solution Approach 2:
The patent changes the operational parameters (intensity and gain) of the existing sensor system to achieve multiple detection states. By varying these parameters dynamically, the system achieves reliable detection across different conditions without adding physical complexity of multiple sensor configurations.
3Device complexity
If conventional single-configuration sensors are used, then device simplicity is maintained, but detection precision under varying conditions deteriorates
Solution Approach 1:
The patent makes the sensor system dynamic by allowing real-time adjustment of intensity and gain parameters. This enables a single simple sensor configuration to adapt to varying detection conditions, maintaining hardware simplicity while achieving high detection precision across different scenarios.
Solution Approach 2:
The patent makes the single sensor system universal by enabling it to perform multiple detection functions through parameter variation. The same transmitter-receiver pair can detect different water levels, presence/absence states, and chamber conditions by adjusting intensity and gain settings.
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
The sensor system provides reliable detection of water levels, reducing complexity and costs by ensuring consistent humidity levels and quick resolution of water-related faults, enhancing mechanical ventilation efficacy.
Implementation Method 1
a transmitter for emitting an electromagnetic radiation signal, a receiver for receiving the electromagnetic radiation signal
Data Source
AI summary
A sensor and method for determining the state of a humidification chamber in a respiratory gas humidifier. The sensor comprises a transmitter for emitting an electromagnetic radiation signal, a receiver for receiving the electromagnetic radiation signal and providing an output signal, and a controller for varying the intensity of the electromagnetic radiation signal emitted by the transmitter and/or the gain setting of the receiver. The controller has two sensor configurations, a first configuration in which the transmitter emits an electromagnetic radiation signal having a first intensity, the receiver has a first gain setting, and the receiver provides a first output signal, and a second configuration in which the transmitter emits an electromagnetic radiation signal having a second intensity, the receiver has a second gain setting, and the receiver provides a second output signal, wherein the first intensity is different to the second intensity, and/or the first gain setting is different to the second gain setting, and the controller determines a state of the humidification chamber by comparing the first and second outputs of the receiver with one or more threshold values.