Sidestream Breathing Monitor With Flow Straightener
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Solution Overview
Problem
Existing sidestream gas sampling systems for monitoring breathing parameters do not effectively utilize pressure or flow information, limiting their ability to enhance the determination of breathing parameters due to the pumping mechanism, which disrupts gas composition and pressure within the sampling chamber.
Innovation Solution
A system comprising a sample cell, a composition detector, a pressure detector, and processors that execute modules to determine breathing parameters by analyzing gas composition and pressure fluctuations, allowing for the identification of breathing events and interface appliance types, thereby improving the accuracy of breathing parameter determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pumping mechanism is used to sample gas through the chamber, then gas sampling is enabled, but pressure and flow information becomes disrupted and less useful
Solution Approach 1:
A flow straightener is introduced as an intermediary component between the pumping mechanism and the sampling chamber. This device mediates the disruptive effect of the pump on gas composition and pressure by conditioning the flow before it enters the chamber, thereby preserving measurement accuracy while maintaining sampling functionality
Solution Approach 2:
The harmful disruptive effects of the pumping mechanism are effectively removed from the sampling chamber environment. By using the flow straightener to separate the pumping action from the measurement zone, the system extracts the negative impact while retaining the beneficial gas sampling function
2Measurement precision
If only gas composition is monitored, then composition detection is achieved, but breathing parameter determination is limited
Solution Approach 1:
The sampling chamber is designed to perform multiple functions simultaneously: it detects gas composition, measures pressure fluctuations, and captures flow information. This multi-functional approach enables comprehensive breathing parameter determination from a single sampling system
Solution Approach 2:
The system uses pressure detector output signals as feedback to enhance the determination of breathing parameters. The pressure information feeds back into the overall analysis, allowing the system to compensate for limitations of composition detection alone and provide more accurate breathing parameter determination
3Measurement precision
If pressure detector is added to the system, then breathing parameter accuracy is improved, but system complexity increases
Solution Approach 1:
The pressure detector and composition detector are merged into a single integrated sampling chamber system. Both detectors operate simultaneously within the same chamber, sharing common infrastructure and reducing overall system complexity despite the addition of pressure measurement capability
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 system enhances the accuracy of breathing parameter determination by incorporating pressure and flow information, enabling the identification of respiratory events and equipment malfunctions, and adapting to different interface appliances, thus providing more reliable monitoring of breathing parameters.
Implementation Method 1
The composition detector is configured to generate output signals conveying information related to the composition of gas received into the sample cell from the conduit
Implementation Method 2
The pressure detector is configured to generate output signals conveying information related to pressure within the conduit
Data Source
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AI summary
Sidestream sampling of gas to determine information related to the composition of gas at or near the airway of a subject is implemented. From such information one or more breathing parameters of subject 12 (e.g., respiratory rate, end-tidal CO2, etc.) are determined, respiratory events (e.g., obstructions, apneas, etc.) are identified, equipment malfunction and/or misuse is identified, and/or functions are performed. To improve the accuracy of one or more of these determinations, information related to pressure at or near the airway of subject is implemented. This information may include detection of pressure at or near a sidestream sampling cell.