Ventilation Control Unit for External Gas Flow Regulation
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Solution Overview
Problem
Ventilation systems face challenges in accurately monitoring and regulating gas flows, especially when an external gas flow source, such as an atomizer, is introduced, as existing methods struggle to quantify these flows without causing disruptions or errors in the system.
Innovation Solution
A ventilation control unit with reception, first calculation, and output modules that receive inspiratory and expiratory flow signals, calculate leak and external gas flows, and output signals for precise regulation, allowing for continuous monitoring and adjustment without shutting off the external gas flow source, enabling precise determination of patient gas flow and leak detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If an external gas flow source (e.g., atomizer) is connected to the ventilation circuit, then the patient receives additional gas flow, but the total gas flow becomes difficult to quantify and control
Solution Approach 1:
The patent uses the leak flow as an intermediary measurement. By measuring the leak flow (which is proportional to pressure differential) and using it as a reference, the system can calculate the external gas flow indirectly through comparison of pressure differentials before and after connecting the external source, without directly measuring the external flow itself.
Solution Approach 2:
The system continuously monitors inspiratory and expiratory gas flows and uses this feedback to calculate and regulate the total patient gas flow. The control unit adjusts the inspiratory gas flow based on calculated external gas flow to maintain the desired total flow to the patient.
2Adaptability or versatility
If the external gas flow source is not controlled quantitatively, then it can be freely used, but the ventilation system cannot accurately determine the total gas flow to the patient
Solution Approach 1:
The patent replaces direct mechanical measurement of external gas flow with a calculation-based approach using pressure differential measurements. By measuring leak flow (which reflects pressure differential) and using proportional relationships, the system derives external gas flow information without direct measurement, preserving system simplicity while gaining measurement capability.
3Reliability
If gas flow monitoring is performed continuously, then accurate patient ventilation is ensured, but system complexity increases
Solution Approach 1:
The patent makes the existing gas flow monitoring system perform multiple functions: it measures not only the primary inspiratory and expiratory flows but also derives leak flow, external gas flow, and total patient flow from the same measurements. This multi-functional approach ensures reliable monitoring without proportionally increasing system complexity.
Data Source
AI summary
A ventilation control unit (100), regulating a gas flow (102) within a ventilation system (105), includes a reception module (120), first and second calculation modules (130, 135) and an output module (140). The reception module has a signal interface (122) receiving inspiratory and expiratory flow signals (125, 127) at regular time intervals. The first calculation module calculates a leak flow (132) based on a difference between the current inspiratory gas flow and the current expiratory gas flow, with an external gas flow source (110) separated from a ventilation circuit of the ventilation system. The second calculation module calculates an external gas flow (136) after connecting the external gas flow source to the ventilation circuit based on the leak flow and the difference between the current inspiratory gas flow and the current expiratory gas flow. The output module outputs an output signal (142), based on the external gas flow.