Ventilation System Exhalation Control via Dynamic Valve Resistance
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Solution Overview
Problem
Conventional medical ventilators face challenges in controlling exhalation times during Positive Expiratory End Pressure (PEEP) ventilation, leading to potential hyperinflation and patient harm due to breath stacking, and require complex and expensive systems for effective PEEP management.
Innovation Solution
A method involving determining lung resistance based on system conditions during exhalation and using a simple on-off or proportional valve to inhibit exhalation, maintaining target pressure by controlling valve position between fully open and fully closed states, reducing exhalation time and avoiding breath stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a passive spring-loaded diaphragm system is used to control PEEP, then the device complexity is reduced, but the exhalation time increases leading to breath stacking
Solution Approach 1:
The patent applies dynamics by transitioning from a static passive valve system to an actively controlled proportional valve that dynamically adjusts resistance in real-time. The control system modifies valve position during the breath cycle to optimize exhalation timing, allowing reduced exhalation time while maintaining PEEP control.
Solution Approach 2:
The patent changes the resistance parameter dynamically during the breath cycle. The proportional valve adjusts resistance incrementally in real-time, allowing the system to reduce exhalation resistance when needed to shorten exhalation time, then increase resistance to maintain target PEEP levels.
2Duration of action of moving object
If actively controlled proportional valves are used to reduce exhalation time, then the exhalation time is reduced, but the device complexity and cost increase
Solution Approach 1:
The patent implements parameter changes by using a proportional valve that incrementally varies resistance in real-time during the breath cycle. This dynamic parameter adjustment allows the system to reduce exhalation time when needed while maintaining target PEEP, achieving performance improvement without requiring overly complex systems.
Solution Approach 2:
The patent employs feedback control where the system monitors actual PEEP levels and minute volume, then adjusts valve resistance accordingly. This closed-loop control enables the proportional valve to optimize exhalation timing while maintaining therapeutic goals, reducing exhalation time without sacrificing control accuracy.
3Stress or pressure
If higher resistance is applied to maintain PEEP, then the PEEP is maintained, but the exhalation time increases
Solution Approach 1:
The patent applies dynamics by using a proportional valve that adjusts resistance dynamically during the breath cycle rather than maintaining constant high resistance. The valve increments resistance to achieve target PEEP while allowing optimized exhalation flow timing, reducing overall exhalation time compared to static high-resistance systems.
Solution Approach 2:
The patent changes the resistance parameter over time during exhalation. The proportional valve starts with lower resistance to facilitate faster exhalation flow, then incrementally increases resistance to maintain target PEEP levels, achieving both reduced exhalation time and adequate PEEP maintenance.
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 approach reduces exhalation times, minimizes the risk of breath stacking, and uses cost-effective, less complex equipment compared to active proportional valve systems, while maintaining effective PEEP control.
Implementation Method 1
a valve to control exhalation resistance in the system
Implementation Method 2
The simplest ventilators use a passive spring-loaded diaphragm system
Data Source
AI summary
A method of controlling exhalation in a ventilation system for providing Positive Expiratory End Pressure, PEEP, ventilation to a lung is disclosed, the method comprising: determining a lung resistance based on conditions of the system detected during an exhalation; and causing the system to inhibit system exhalation to cause and maintain a target system pressure based on the determined lung resistance and a pressure condition in the system.