Ventilator Control System for Minimum Ventilation Guarantee
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Solution Overview
Problem
Current mechanical ventilation systems, such as proportional assist ventilation, fail to guarantee a minimum level of ventilation to patients, especially when their spontaneous breathing activity weakens, leading to potential hazardous situations due to inadequate support.
Innovation Solution
A ventilator control system that continuously measures inspiratory gas volume and flow rate, adjusting pressure support by determining and modifying elastic and resistive pressure components to ensure a minimum required ventilation, while synchronizing with the patient's breathing pattern and preventing fatigue or dyspnea.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If proportional assist ventilation is used to follow patient's spontaneous breathing pattern, then synchrony between machine and patient is improved, but minimum ventilation guarantee is lost
Solution Approach 1:
The system dynamically adjusts the support level parameter (alpha) to change the relationship between machine support and patient effort. By modifying this parameter, the system can transition between different ventilation modes while maintaining both synchrony and minimum ventilation guarantees.
Solution Approach 2:
The system continuously monitors patient breathing parameters and compares actual ventilation against required minimum ventilation. This feedback mechanism allows the system to detect when spontaneous breathing becomes insufficient and automatically increase support to maintain minimum ventilation guarantees.
2Adaptability or versatility
If automatic adjustment of support level is implemented, then adaptability to patient's changing needs is improved, but device complexity increases
Solution Approach 1:
The system automatically monitors patient breathing patterns and self-adjusts the support level without requiring manual intervention. The ventilator calculates required ventilation, compares it with actual ventilation, and autonomously modifies support parameters to adapt to changing patient needs.
Solution Approach 2:
Continuous feedback loops monitor patient breathing parameters and automatically adjust support levels. The system uses real-time data on tidal volume, respiratory rate, and work of breathing to dynamically optimize ventilation support while maintaining safety margins.
Data Source
AI summary
A method and an apparatus for controlling a ventilator to automatically adjust ventilation assistance to an active or passive subject. The method includes determining volume and flow rate of gas to the patient during inspiration on an ongoing basis, and generating control signals in proportion to the volume and flow rate of gas to the patient wherein proportionality factors, and support levels for the elastic and resistive components of pressure are automatically adjusted by the ventilator. The ongoing pressure applied by the ventilator is a sum of elastic and resistive pressures that are automatically controlled by the system. When the patient breathes spontaneously, the support levels are automatically adjusted based on the patient's requirements. If the patient does not breathe spontaneously, the ventilator provides ventilation at an optimal level and rate. The method may be used in weaning or in a management phase of ventilation.