Capnography System with Dual Flow Paths for Nasal Cycle Compensation
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Solution Overview
Problem
Existing capnographic devices face challenges in accurately measuring carbon dioxide levels due to dynamic changes in exhaled gas flow, such as those caused by the nasal cycle, leading to leaks and reduced accuracy in carbon dioxide percentage readings.
Innovation Solution
The system measures carbon dioxide levels from each breathing orifice separately and combines or averages values based on airflow thresholds to create a capnographic waveform, ensuring accurate measurements by isolating and utilizing data from active flow paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single flow path is used for measuring carbon dioxide in exhaled gas, then the device complexity is reduced, but the measurement precision deteriorates due to dynamic changes in exhaled gas flow and nasal cycle variations
Solution Approach 1:
The exhaled gas measurement system is divided into multiple separate flow paths (first flow path and second flow path), each with its own carbon dioxide sensor. This segmentation allows independent measurement of exhaled gas from different nasal passages, enabling the system to account for nasal cycle variations and improve measurement accuracy without requiring a single complex flow path
2Reliability
If multiple flow paths are used for measuring carbon dioxide, then the measurement precision improves by accounting for nasal cycle variations, but the device complexity increases
Solution Approach 1:
The system combines data from multiple flow paths and carbon dioxide sensors through a controller that integrates the measurements. The controller processes readings from both flow paths, determines which provides more reliable data based on flow characteristics, and combines or selects the appropriate measurements to generate the capnographic waveform, thereby improving reliability while managing complexity through intelligent data fusion
3Measurement precision
If carbon dioxide values from multiple flow paths are combined, then the measurement accuracy improves by averaging out variations, but the processing complexity increases
Solution Approach 1:
The controller implements a feedback mechanism that continuously monitors flow characteristics from each path and dynamically determines which carbon dioxide measurements are most reliable. Based on this feedback about flow conditions, the controller selectively uses or combines data from different flow paths, adjusting the measurement strategy in real-time to maintain accuracy without requiring complex processing of all possible data combinations
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 enhances the accuracy of carbon dioxide measurement by accounting for variations in exhaled gas flow, reducing misdiagnosis and improving patient monitoring.
Implementation Method 1
measuring, by a controller of a device, carbon dioxide in exhaled gas flowing in a first flow path
Data Source
AI summary
At least one example embodiment is a method of generating a capnographic waveform, the method including: measuring carbon dioxide in exhaled gas flowing in a first flow path, the measuring creates a first set of values indicative of carbon dioxide; measuring, by the controller of the device, carbon dioxide in exhaled gas flowing in a second flow path distinct from the first flow path, the measuring creates a second set of values indicative of carbon dioxide; and creating, by the controller of the device, a capnographic waveform. Creating the capnographic waveform may including using the first set of values indicative of carbon dioxide, the second set of values indicative of carbon dioxide, and/or both the first and second sets of values of carbon dioxide.