Acoustic Spirometer Using Rotor-Driven Transducer
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Solution Overview
Problem
Current spirometry monitoring requires expensive equipment and is typically conducted in clinical settings, limiting ongoing patient monitoring and adherence to lifestyle and medication factors, especially for asthma patients, necessitating a cost-effective, user-friendly, and mobile solution for spirometric flow rate measurement.
Innovation Solution
A system utilizing a microphone and mobile computer device connected to an acoustic transducer that converts spirometric flow rates into audible signals, allowing for real-time measurement and analysis of peak expiratory flow rates without the need for physical or electrical connections, enabling users to monitor and upload results to medical practitioners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sophisticated medical equipment is used for spirometry monitoring, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex electronic flow sensors with a simple acoustic transducer system. A rotor blade mechanism converts respiratory flow into rotational motion, which drives an acoustic transducer to generate sound waves. A microphone captures these sound waves, and the frequency of the sound corresponds to the flow rate. This mechanical-acoustic substitution dramatically simplifies the device while maintaining measurement capability.
Solution Approach 2:
The patent uses acoustic copying to represent flow rate information. Instead of directly measuring electrical properties of the breath, the system converts flow into sound wave frequency - a copy of the flow information in a different physical domain. This acoustic copy can be easily captured, transmitted, and analyzed by standard microphones and processors.
2Measurement precision
If sophisticated medical equipment is used for spirometry monitoring, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent employs inexpensive, readily available components: a simple rotor blade assembly, an acoustic transducer, and a standard microphone. These components can be manufactured at low cost and are replaceable if needed. The avoidance of expensive electronic flow sensors and specialized medical equipment dramatically reduces both manufacturing and replacement costs.
Solution Approach 2:
By replacing expensive electronic sensing systems with a mechanical rotor-acoustic transducer-microphone system, the patent achieves significant cost reduction. The mechanical components are simpler to manufacture, and the use of off-the-shelf microphones further drives down costs while maintaining adequate measurement precision.
3Reliability
If clinical setting monitoring is used, then measurement reliability is improved, but ease of operation decreases
Solution Approach 1:
The patent enables patients to perform spirometry monitoring themselves at home without requiring clinical staff or specialized training. The device is designed to be simple to operate - the patient simply breathes through the mouthpiece, and the system automatically captures the acoustic signal, processes it, and stores the results. This self-service capability brings reliable monitoring directly to the patient's environment.
Solution Approach 2:
The patent creates a universal monitoring system that can be used by any patient regardless of location or clinical infrastructure. The device integrates multiple functions: acoustic signal generation, signal capture, processing, storage, and data transmission, all in one portable unit. This multi-functionality eliminates the need for specialized clinical equipment while maintaining reliability.
4Loss of information
If continuous monitoring is implemented, then loss of information is reduced, but device complexity increases
Solution Approach 1:
The patent enables continuous, uninterrupted spirometry monitoring by designing a portable device that patients can use in their daily lives without returning to the clinic. The acoustic-based measurement system requires no calibration drift correction, battery changes, or maintenance during use, allowing truly continuous data collection over extended periods, capturing lifestyle factors and temporal variations in lung function.
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
Enables continuous, cost-effective, and user-friendly spirometric monitoring anywhere, providing immediate feedback and improved adherence to treatment plans by allowing patients to track their lung function and medication optimization.
Implementation Method 1
a transducer adapted for converting a spirometric flow rate into an audible signal with an audio frequency characteristic of the spirometric flow rate
Implementation Method 2
The microphone may be adapted to detect the audible signal having an audio frequency and to convert the audible signal to a corresponding electrical signal having audio frequency
Data Source
AI summary
Embodiments of the present invention are directed a system using a microphone and a mobile computer device comprising a transducer through which a user is to exhale or inhale; the transducer is configured and operable to convert the spirometric flow rate into an audible signal having an audio frequency responsive to the spirometric flow rate, wherein the transducer comprises a rotor including a plurality of rotor blades configured to rotate the rotor responsive to a spirometric flow; wherein the microphone is external to the transducer and is adapted to detect the audible signal having the audio frequency and to convert the audible signal to a corresponding electrical signal having the audio frequency.