Ventilator Backflow Prevention via Dynamic Pressure Control
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Solution Overview
Problem
Existing ventilators face challenges in preventing backflow of exhaled air, which can lead to rebreathing and contamination, especially when switching between leakage and valve ventilation, as they often require time-consuming conversions and are not user-friendly, particularly in clinical and home therapy settings.
Innovation Solution
A method that uses a blower device to generate respiratory gas flows with adjustable pressures during inhalation and exhalation phases, employing a monitoring device to detect backflow characteristics and apply a back pressure to prevent rebreathing, eliminating the need for non-return valves and allowing convenient switching between ventilation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-return valve is installed to prevent backflow, then protection against rebreathing is improved, but device complexity and conversion time increase
Solution Approach 1:
The patent removes the non-return valve from the system and replaces it with a control method that uses pressure sensing and blower control to prevent backflow. This extraction of the mechanical valve eliminates the need for conversions while maintaining protection against rebreathing.
Solution Approach 2:
The patent replaces the mechanical non-return valve system with an electronic control system that uses pressure sensors, microcontrollers, and blower control to achieve the same backflow prevention function. This substitution eliminates mechanical conversions and simplifies device switching.
2Reliability
If a non-return valve is used to prevent backflow, then protection against contamination is improved, but ease of operation deteriorates
Solution Approach 1:
The patent removes the non-return valve that required manual conversion, replacing it with an automated control system that prevents contamination without requiring user intervention or conversion procedures, thereby improving ease of operation.
Solution Approach 2:
The patent implements a self-regulating system where the blower automatically adjusts pressure based on sensor feedback to prevent backflow and contamination. This self-service mechanism eliminates the need for user conversion procedures and maintains protection without additional operational complexity.
3Reliability
If a non-return valve is installed, then backflow protection is improved, but loss of time increases
Solution Approach 1:
The patent removes the non-return valve and its associated conversion requirements, implementing backflow protection through a control method that requires no time-consuming conversions. The system maintains protection while enabling immediate switching between ventilation modes.
Solution Approach 2:
The patent implements preliminary detection and response through pressure sensors that continuously monitor for backflow conditions and trigger blower adjustments before contamination occurs. This preliminary action eliminates the need for preventive conversions and maintains continuous protection without time loss.
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 solution effectively prevents backflow and rebreathing by dynamically adjusting ventilation pressures, ensuring user-friendly operation and reducing the need for complex conversions, thus enhancing ventilation safety and convenience.
Implementation Method 1
The respiratory gas flow is adjusted with the aid of at least one control device to at least one first ventilation pressure during an inhalation phase of the patient. The respiratory gas flow is adjusted to at least one second ventilation pressure during an exhalation phase.
Implementation Method 2
At least one characteristic variable for a flow within the flow connection is detected in this case in order to monitor the backflowing exhaled air.
Implementation Method 3
At least one back pressure with respect to the backflowing expiratory flow is adjusted by means of a specific increase of the ventilation pressure with consideration for the detected variable. An undesirable rebreathing into the ventilation device is counteracted by means of the back pressure.
Data Source
AI summary
The present invention relates to a method for protecting a ventilation device of a ventilator against backflowing exhaled air, and to a ventilator. A respiratory gas flow is generated by a blower device and is guided via a flow connection to a breathing interface. The respiratory gas flow is adjusted with the aid of a control device to a first ventilation pressure during an inhalation phase of the patient and to a second ventilation pressure during an exhalation phase. A characteristic variable for a flow within the flow connection is detected by a device for monitoring backflowing exhaled air. A back pressure with respect to the backflowing expiratory flow is adjusted by a specific increase of the ventilation pressure taking into consideration the characteristic variable, whereby an undesirable rebreathing into the ventilation device is counteracted by the back pressure.