Breath Compound Monitoring Using CO2-Guided Sidestream Sampling
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Solution Overview
Problem
Existing devices for continuous monitoring of volatile breathing compounds in respiratory gases face challenges such as variability in breath sampling, sensitivity and selectivity issues, interference from other gases, and the need for frequent calibration, which affect accuracy and reproducibility, particularly in intensive care unit environments.
Innovation Solution
A device comprising a patient respiratory gas interface, a sidestream respiratory gas monitor, a pump, and a valve system with a control unit to regulate gas flow to a volatile breathing compound detector based on CO2 content, ensuring accurate and timely detection of compounds like CO and NO, using electrochemical sensors with improved response times and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous monitoring of volatile breathing compounds is implemented, then real-time physiological information is obtained, but variability in breath sampling and interference from other gases affect measurement accuracy
Solution Approach 1:
The system uses CO2 monitoring as a feedback mechanism to control gas flow timing. The CO2 sensor detects the presence of exhaled breath, and this information feeds back to the control system to trigger the sampling valve, ensuring that volatile compound sampling occurs only during actual exhalation phases, thereby improving both accuracy and reproducibility
Solution Approach 2:
The patent introduces CO2 monitoring as an intermediary mechanism to mediate between the patient's breath and the volatile compound detector. By using CO2 as a proxy signal for breath presence, the system indirectly controls the sampling process, reducing variability and interference effects
2Measurement precision
If frequent calibration is performed to maintain accuracy, then measurement precision is improved, but device complexity and operational burden increase
Solution Approach 1:
The system performs self-calibration by using the patient's own CO2 signal as a reference. The control system automatically adjusts sampling timing based on the detected CO2 levels, eliminating the need for external calibration procedures and reducing operational complexity while maintaining accuracy
3Measurement precision
If CO2 controlled signal is used to control valve timing, then sampling accuracy is improved, but response time of volatile compound detection is delayed
Solution Approach 1:
The system performs preliminary detection of CO2 signal in advance to predict when exhalation will occur. The control system uses this advance information to pre-position the sampling valve and prepare the gas flow path, so that when the actual exhalation occurs, the system is already ready to capture the volatile compounds immediately, minimizing detection delay
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 device provides sensitive, selective, and reliable real-time monitoring of volatile breathing compounds, improving accuracy and reliability in ICU conditions, and enabling effective clinical decision-making.
Implementation Method 1
a sidestream respiratory gas monitor, wherein the sidestream respiratory gas monitor is adapted to continuously monitor carbon dioxide (CO2) content of the respiratory gases
Implementation Method 2
the at least one volatile breathing compound detector is adapted to continuously monitor volatile breathing compound content of the respiratory gases led to the at least one breathing compound via the valve; wherein the volatile breathing compound includes at least one of carbon monoxide (CO) and nitric oxide (NO)
Implementation Method 3
a pump arranged to facilitate a continuous flux of the respiratory gases through the device including through the sidestream respiratory gas monitor
Data Source
AI summary
Disclosed herein are systems and methods for monitoring at least one volatile breathing compound in respiratory gases of patients. A device includes a patient respiratory gas interface coupled via a connector to a gas sampling line. The line includes a first channel for conducting a predetermined flux of respiratory gases from the interface to an inlet of a sidestream gas monitor, which monitors carbon dioxide (CO2) content. A pump facilitates gas flow through the device and the monitor. An outlet of the monitor is coupled to a second channel for conveying gases away. A valve controls passage of respiratory gas from the monitor via the second channel by connecting or disconnecting the flux to/from at least one volatile breathing compound detector, which monitors compound content. A control unit monitors CO2 values and uses this as a signal to control the valve, enabling compound monitoring or bypass based on CO2 content.