Curved Flow Path Sensing for Accurate Respiratory Gas Measurement
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Solution Overview
Problem
Current flow therapy apparatuses face challenges in accurately measuring gas flow rates and oxygen concentrations due to unwanted vorticity and dead spaces in the flow path, which can lead to anomalies in measurement, especially when using ultrasonic sensors.
Innovation Solution
A flow therapy apparatus with a continuously curved flow path and strategically positioned ultrasonic transducers and heated temperature sensing elements to minimize vorticity and dead spaces, allowing for precise measurement of flow rates and oxygen concentrations, and a calibration system to adjust readings for accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional flow path with angles and dead spaces is used, then the device structure is simple, but measurement precision deteriorates due to vorticity and dead spaces causing anomalies in sensor readings
Solution Approach 1:
The flow path is designed with continuously curved surfaces and no sharp angles, creating a smooth flow path that eliminates vorticity and dead spaces. This curvature principle ensures laminar flow throughout the measurement section, allowing ultrasonic sensors to accurately measure flow rates without anomalies caused by turbulent flow patterns.
Solution Approach 2:
The design extracts and eliminates dead spaces from the flow path by ensuring all surfaces are continuously curved. By removing stagnant flow regions and sharp angles where vorticity forms, the measurement section becomes free from flow anomalies that would interfere with sensor accuracy.
2Measurement precision
If ultrasonic sensors are positioned in a flow path with dead spaces, then device complexity is reduced, but measurement precision worsens due to vorticity creating measurement anomalies
Solution Approach 1:
The sensor positioning is integrated into the continuously curved flow path design, where sensors are placed in regions of smooth, laminar flow. The curved geometry naturally guides flow uniformly past the sensor locations, eliminating vorticity-related measurement anomalies without requiring complex sensor mounting structures or flow conditioning elements.
3Reliability
If a flow path with sharp angles and dead spaces is used, then manufacturing is easier, but reliability deteriorates due to unwanted vorticity affecting measurement accuracy
Solution Approach 1:
The continuously curved flow path design eliminates sharp angles and dead spaces that cause vorticity, ensuring reliable and anomaly-free measurements. While curved surfaces may require more sophisticated manufacturing processes compared to simple angular geometries, the design achieves superior measurement reliability by preventing flow-related measurement errors.
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 solution provides accurate and reliable measurements of gas flow rates and oxygen concentrations, reducing anomalies and improving the overall performance of the flow therapy apparatus by minimizing pressure drops and enhancing measurement accuracy.
Implementation Method 1
The one or more sensors can comprise two or more ultrasonic transducers. The ultrasonic transducers can be configured to determine a flow rate.
Implementation Method 2
The one or more sensors can comprise a heated temperature sensing element configured to measure gases flow rate.
Implementation Method 3
The one or more sensors can comprise a gas concentration sensor. The ultrasonic transducers can be configured to determine a gas concentration.
Data Source
AI summary
A respiratory flow therapy apparatus including a sensing chamber which measures a flow of gases provided to a patient. The sensing chamber can be located after a blower and/or mixer. The sensing chamber can include an ultrasonic transducer, a temperature sensor, a heated temperature sensing element, and/or a gas concentration sensor. A flow path of gases used in conjunction with the sensor system prevents unwanted vorticity in the flow of gases that can create anomalies in measuring flow.