Tube Resonance Frequency Measurement via Time Delay Variation
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Solution Overview
Problem
Current methods for measuring resonance frequencies of tubes, such as blood vessels and airways, are inaccurate and unable to distinguish between different parts of the lung system, limiting their clinical utility for diagnosis and treatment.
Innovation Solution
A system that oscillates tubes at multiple frequencies to detect time delays and determine the resonance frequency by identifying the frequency with the maximal variation in time delay, allowing for accurate measurement and analysis of tube properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods (FOT or IOS) are used to measure resonance frequency, then the measurement can be performed on the lung system, but the measurement precision is limited to low frequencies and cannot distinguish resonances of different airway parts
Solution Approach 1:
The patent applies segmentation by dividing the lung system into distinct airway segments (trachea, main bronchi, small bronchioles) and measuring resonance frequencies for each segment separately. This is achieved by using multiple sensors positioned at different locations and processing signals to identify resonance frequencies specific to each airway segment, thereby enabling differentiation between resonances of different airway parts while maintaining measurement precision across a broad frequency range.
2Measurement precision
If artery segment is taken out for resonance measurement, then resonance frequency can be observed, but the method is not useful for clinical practice
Solution Approach 1:
The patent applies the 'Taking out' principle by extracting the resonance measurement capability from the invasive artery segment extraction method and transferring it to a non-invasive clinical setting. Instead of removing artery segments for measurement, the system uses external sensors and signal processing to detect resonance frequencies of airways in living patients, thereby maintaining measurement accuracy while enabling clinical applicability.
3Measurement precision
If multiple oscillation frequencies are applied to detect time delay variation, then resonance frequency can be accurately identified, but the system complexity increases
Solution Approach 1:
The patent applies periodic action by using multiple oscillation frequencies applied in sequence to the airways and detecting time delay variations at each frequency. The system systematically varies the oscillation frequency and measures the corresponding time delay to identify the frequency with maximal time delay variation, which corresponds to the resonance frequency. This periodic measurement approach achieves accurate resonance identification while managing system complexity through structured signal processing.
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 system enables more precise measurement and calculation of resonance frequencies, improving diagnostic accuracy and aiding in therapeutic interventions, such as cough assistance by targeting specific airway resonances.
Implementation Method 1
The resonance of a tube relates to the movements caused by the excitation applied to a tube. The frequency at which resonance occurs is dependent, among other factors, on material properties of the tube.
Implementation Method 2
The time delay depends on the velocity of a pressure pulse travelling in the artery, and the time delay is correlated to the elasticity of the artery wall.
Data Source
AI summary
The invention proposes a system for measuring a resonance frequency of a tube. The system comprises: an oscillating unit (21) for oscillating the tube at a plurality of oscillation frequencies, respectively; a detecting unit (22) for detecting a time delay of transmitting a pressure pulse from a first position to a second position in the tube when the tube is oscillated at each oscillation frequency, wherein, when the tube is oscillated at each oscillation frequency in a specific oscillation frequency range of the plurality of oscillation frequencies, the detecting unit (22) detects a variation of the time delay—a determining unit (23) for determining a maximal variation of the time delay when the tube is oscillated at the oscillation frequencies in the specific oscillation frequency range; and—an indicating unit (24) for indicating an oscillation frequency corresponding to the maximal variation of the time delay, being a resonance frequency of the tube.