Ventilator Oxygen Control System with SpO2 Feedback
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Solution Overview
Problem
Current ventilator control systems do not ensure uniform oxygen saturation in ventilated individuals, leading to potential irreversible damage from either oxygen deficiency or excess, and lack effective detection of signal quality issues.
Innovation Solution
A control system for ventilators that initializes oxygen saturation settings between 85% and 99%, applies an oxygen safety factor, and automatically adjusts oxygen concentration based on actual readings, triggering alarms for inadequate signal quality, thereby ensuring safe ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxygen concentration in breathing gas is increased to ensure adequate oxygen supply, then oxygen deficiency is prevented, but oxygen toxicity and lung damage can occur
Solution Approach 1:
The control system continuously monitors actual oxygen saturation via SpO2 sensors and adjusts oxygen concentration in real-time based on feedback from the patient's physiological state. This closed-loop control prevents both oxygen deficiency and oxygen toxicity by dynamically adapting the oxygen delivery to actual needs.
Solution Approach 2:
The system changes the oxygen concentration parameter dynamically based on detected oxygen saturation levels. When SpO2 drops below the target range, oxygen concentration is increased; when it approaches or exceeds the range, concentration is reduced. This adaptive parameter adjustment ensures safety margins are maintained.
2Device complexity
If manual control of oxygen concentration is used, then system complexity is reduced, but user error and inadequate oxygen saturation control increase
Solution Approach 1:
The control system performs self-adjustment of oxygen concentration based on automatic SpO2 monitoring. The system serves itself by detecting oxygen saturation levels and autonomously modifying oxygen delivery parameters without requiring continuous manual intervention, thereby improving reliability while maintaining acceptable complexity.
Solution Approach 2:
Automatic feedback control loops continuously monitor SpO2 and adjust oxygen concentration accordingly. This eliminates human error in manual adjustment while maintaining system reliability through automated physiological response monitoring and control.
3Measurement precision
If oxygen saturation monitoring is implemented, then oxygen delivery accuracy is improved, but signal quality issues and measurement errors can occur
Solution Approach 1:
The system performs initialization of the control mode before actual ventilation begins. During initialization, SpO2 sensors are calibrated and baseline measurements are established. This preliminary setup ensures that subsequent measurements are accurate and reduces the risk of signal quality issues during critical ventilation phases.
Solution Approach 2:
The system establishes target SpO2 ranges with safety margins before ventilation starts. These pre-defined target ranges act as cushioning buffers that account for potential measurement variations and signal quality fluctuations, ensuring that even with measurement uncertainty, the oxygen delivery remains within safe boundaries.
4Loss of time
If ventilation starts immediately without control initialization, then response time is reduced, but malfunctions and inadequate signal quality may go undetected
Solution Approach 1:
The control system performs essential initialization functions before ventilation begins, including sensor calibration, target SpO2 range setting, and control mode configuration. This preliminary action detects potential malfunctions early while minimizing delay to actual ventilation startup.
Solution Approach 2:
The initialization process is designed to be rapid, skipping non-critical setup steps and focusing only on essential safety checks and parameter configurations. This allows the system to quickly transition from initialization to active ventilation, minimizing time loss while ensuring reliability.
Data Source
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AI summary
The invention relates to a method (101) for controlling a ventilator, characterized by the steps of: acquiring (130) the actual oxygen saturation of the organism (40) to be ventilated for a ventilation period; acquiring (140) the actual oxygen concentration in the breathing gas for a ventilation period; setting (180) an oxygen saturation target; comparing (190) the actual oxygen saturation with the oxygen saturation target; and controlling (200) the oxygen concentration in the breathing gas to an oxygen target concentration as a function of the comparison of the actual oxygen saturation with the oxygen saturation target, wherein controlling the oxygen concentration in the breathing gas comprises: controlling (200a) the ambient air flow in the air line; and/or controlling (200b) the oxygen flow in the oxygen line; and/or controlling (200c) the breathing gas in the breathing gas line.