CPAP Blower Mask System Characterization
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Solution Overview
Problem
Current CPAP devices for treating sleep disordered breathing require accurate measurement of pressure and flow characteristics in mask systems, which often necessitates additional sensing tubes, making them inconvenient for patients and difficult to assemble, and require manufacturers to characterize each mask system, limiting their versatility and ease of use.
Innovation Solution
A method and apparatus that determine air flow characteristics of mask systems by measuring flow and pressure during specific test periods, allowing for the estimation of pressure drop and diffuser flow without the need for sensing tubes, enabling the CPAP device to work with a variety of mask systems without requiring manufacturer testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sense tubes are used to measure pressure and flow characteristics, then measurement accuracy is improved, but device complexity and ease of operation deteriorate due to assembly difficulty and tangling
Solution Approach 1:
The patent extracts the measurement function from the physical sense tube and implements it through mathematical modeling. By removing the sense tube component entirely and using equations to calculate pressure and flow characteristics from blower measurements, the invention eliminates the assembly and tangling problems while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces the mechanical sense tube system with a computational approach. Instead of using physical tubes to transmit pressure and flow data, the invention uses mathematical models and algorithms to calculate these characteristics from blower performance data, substituting mechanical measurement with computational analysis.
2Measurement precision
If sense tubes are used for mask system characterization, then measurement accuracy is improved, but ease of operation worsens due to tangling and assembly difficulties
Solution Approach 1:
The patent removes the sense tube from the system entirely, extracting its measurement function and replacing it with computational methods. This eliminates the operational difficulties associated with sense tube assembly and maintenance while preserving the ability to accurately characterize mask systems.
Solution Approach 2:
The patent enables the CPAP device to automatically characterize mask systems using built-in blower measurements and mathematical models. The system performs self-characterization without requiring external sense tubes or complex assembly procedures, making the device easier to operate and maintain.
3Measurement precision
If manufacturer testing is required for new mask systems, then measurement accuracy is improved, but loss of time and productivity worsen due to returning devices for characterization
Solution Approach 1:
The patent performs mask system characterization immediately during initial device setup or manufacturing, using the built-in blower and mathematical models. This preliminary characterization eliminates the need for later manufacturer testing and returns, saving significant time while maintaining measurement accuracy.
Solution Approach 2:
The patent enables the CPAP device to autonomously characterize mask systems using its own blower and sensors, without requiring external manufacturer facilities. This self-characterization capability eliminates shipping delays and manufacturer scheduling constraints, dramatically reducing the time required for mask system validation.
4Measurement precision
If sense tubes are used between flow generator and mask, then measurement accuracy is improved, but device complexity increases due to additional components and assembly steps
Solution Approach 1:
The patent extracts the measurement function from the sense tube component and implements it through mathematical calculations based on blower measurements. This removal of the sense tube eliminates the associated complexity while maintaining the ability to accurately measure pressure and flow characteristics.
Solution Approach 2:
The patent makes the blower serve multiple functions: it not only delivers breathable air to the patient but also acts as a measurement instrument for characterizing mask systems. By using the existing blower for dual purposes, the invention eliminates the need for separate sense tubes and reduces overall device complexity.
Data Source
AI summary
A method and a CPAP apparatus for characterizing a plurality of different mask systems, e.g., masks and hoses, are provided. The CPAP apparatus can be calibrated for different mask systems and hoses by including sensors configured to measure flow and pressure at a flow generator of the CPAP apparatus. When the flow generator is fitted to a new mask system, or any changes are made to an existing mask system, mask or patient interface and/or hose, a method for calibrating the flow generator for the new mask system, mask and/or hose is provided. The method includes determining air flow characteristics using flow measurements made during a first test period when the flow through the mask system is open, measuring or estimating pressure in the mask system during a second test period when the flow through the mask system is blocked and determining air flow characteristics of the diffuser of the mask system using the air flow characteristics of the air delivery hose determined during the first test period and the pressure measurements made during the second test period.