Dynamic Breath Gas Sampling Flow Control
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Solution Overview
Problem
The constant sample flow rate in breath gas measurement techniques leads to unnecessary water and mucus removal, increased occlusion situations, shorter equipment lifetimes, higher pump noise, and excessive consumption of anesthetic gases, particularly during anesthesia procedures.
Innovation Solution
Implementing a dynamic sample flow rate adjustment based on the patient's breathing rate, where the sample flow rate is minimized at low breathing rates and increased at high rates, using a formula such as Sample flow rate = X*breathing rate + minimum sample flow rate, to maintain measurement accuracy and reduce unnecessary gas consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a constant high sample flow rate is used to ensure measurement accuracy for maximum breathing rates, then measurement precision is improved, but water and mucus removal increases, shortening the lifetime of sampling lines and water traps
Solution Approach 1:
The patent applies dynamics by transitioning from a constant sample flow rate to a dynamically adjusted flow rate that varies with the patient's breathing rate. The control unit continuously monitors the breathing rate and adjusts the sample flow rate accordingly, ensuring sufficient flow for accurate measurement at high breathing rates while reducing flow at lower rates to minimize water and mucus removal, thereby extending the lifetime of sampling lines and water traps.
2Measurement precision
If a constant high sample flow rate is used, then measurement precision is improved, but the lifetime of the pump decreases due to increased load
Solution Approach 1:
The control unit dynamically adjusts the pump's sample flow rate based on real-time monitoring of the patient's breathing rate. By matching the flow rate to the actual breathing rate rather than maintaining a constant high flow, the pump operates at lower average loads, reducing wear and extending its lifetime while still providing sufficient flow for accurate measurements when needed.
3Measurement precision
If a constant high sample flow rate is used, then measurement precision is improved, but anesthetic gas consumption increases unnecessarily
Solution Approach 1:
The system dynamically adjusts the sample flow rate to match the patient's breathing rate, monitored in real-time by the control unit. This ensures that during periods of lower breathing rates, the sample flow rate is reduced accordingly, minimizing the consumption of expensive anesthetic gases while maintaining sufficient flow for accurate measurement during high breathing rates.
4Measurement precision
If a constant high sample flow rate is used, then measurement precision is improved, but pump noise increases
Solution Approach 1:
The control unit dynamically adjusts the pump's operating flow rate based on the patient's breathing rate. By reducing the flow rate during periods when high flow is not needed, the pump operates more quietly, reducing noise disturbance while still providing sufficient flow for accurate measurements when the patient's breathing rate requires it.
Data Source
AI summary
Method and arrangement for measuring breath gases of a patient in which the patient is connected to a breath gas unit by using a sampling line to enable flowing a sample of the breathing gases with a pre-determined sample flow rate to the breath gas measuring unit. The sample flow rate is adjusted in case it is not within limits set by the patient's breathing rate.