Ultrasonic Gas Flow Calibration for Ventilator Accuracy
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Solution Overview
Problem
Current ventilator test devices face challenges in accurately measuring gas flow volume and pressure across a wide range of respiratory outputs, particularly in neonates and adult athletes, due to methodological and accuracy limitations of existing flow sensors, which can lead to impaired patient outcomes.
Innovation Solution
The use of digital ultrasonic flow monitoring combined with pressure sensors to determine fluid/gas parameters, where ultrasonic transducers project and receive acoustic waves obliquely to the flow direction, allowing for precise measurement of flow, volume, and pressure, and transmitting data for real-time display and feedback to adjust ventilator settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional flow sensors (differential pressure, pitot-tube, thermopile) are used for measuring gas flow, then the device complexity is reduced and ease of manufacture is improved, but measurement precision and reliability deteriorate due to methodological and accuracy limitations
Solution Approach 1:
The patent replaces traditional mechanical flow sensors (differential pressure sensors, pitot-tube based sensors, thermopile sensors) with an ultrasonic flow measurement system. This substitution eliminates the methodological and accuracy limitations of mechanical sensors while providing more precise gas flow measurements through acoustic wave propagation time differences.
Solution Approach 2:
The invention changes the measurement parameter from pressure-based or thermal-based detection to ultrasonic acoustic wave propagation time-based detection. By measuring the difference in transit time of ultrasonic waves traveling with and against the gas flow, the system achieves superior measurement precision without the limitations of traditional sensor methods.
2Adaptability or versatility
If multiple flowmeters with different measurement ranges are used to cover wide flow range (neonates to adult athletes), then measurement precision is maintained across ranges, but device complexity increases due to interchangeable components
Solution Approach 1:
The ultrasonic flow measurement system is designed to universally measure gas flow across the entire range from neonatal to adult athletic levels without requiring interchangeable components. The system adapts to different flow ranges through software processing and calibration rather than physical component changes, eliminating the complexity of multiple flowmeters while maintaining versatility.
Solution Approach 2:
The ultrasonic flow measurement system automatically adapts to different flow ranges through self-calibration and range detection capabilities. The system can identify and adjust to appropriate measurement ranges without manual intervention or component interchange, providing self-service functionality that simplifies the overall device architecture.
3Measurement precision
If manual comparison and re-calibration of ventilator settings is performed, then measurement precision can be verified, but loss of time increases due to manual operator intervention
Solution Approach 1:
The system implements automated feedback by comparing the measured gas flow parameters from the ultrasonic sensors with the ventilator's set parameters and automatically generating calibration corrections. This closed-loop feedback system eliminates manual comparison and re-calibration, maintaining measurement precision while significantly reducing calibration time through automated processing.
Solution Approach 2:
The ultrasonic flow measurement system acts as an intermediary between the ventilator and the calibration process. It provides accurate real-time flow measurements that serve as a reference standard, enabling automated calibration algorithms to adjust ventilator settings without requiring manual operator intervention for comparison and adjustment.
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
This approach provides more accurate and reliable measurements of gas flow, volume, and pressure, enhancing the calibration and operation of ventilators, thereby improving patient safety and reducing the risk of ventilator-related complications.
Implementation Method 1
utilising at least a first ultrasonic transducer to project an alternating ultrasonic signal substantially transverse to the direction of fluid flow; sampling the ultrasonic signal after it traverses the fluid flow
Implementation Method 2
utilising at least a first ultrasonic transducer to project an alternating ultrasonic signal substantially transverse to the direction of fluid flow; sampling the ultrasonic signal after it traverses the fluid flow; processing the sampled signal to determine properties of the fluid and flow parameters
Data Source
AI summary
A method of monitoring the flow of a gas along a channel, the method including the steps of: Utilising at least a first ultrasonic transducer to project an alternating ultrasonic signal substantially transverse to the direction of gas flow and ultrasonic receivers to receive the signals; Sampling the ultrasonic signal after it traverses the gas flow; and Processing the sampled signal to determine properties of the gas and flow parameters relating thereto.