Ventilator P/V Maneuver Control for Lung Overdilation Prevention
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Solution Overview
Problem
Existing ventilation technologies require costly and time-intensive patient-specific compliance threshold calculations for P/V maneuvers, leading to potential lung overdilation and adverse health effects, with measurement data being contaminated by pulmonary overdilation.
Innovation Solution
A ventilation device that determines a sequence of compliance values during the P/V maneuver, sets a reference compliance value, and terminates the inspiration phase when a termination compliance value is reached, using flow and pressure sensors to prevent lung overdilation without patient-specific historical data recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If patient-specific pre-calculation of compliance threshold values is performed, then reliability of P/V maneuver is improved, but loss of time and manufacturing cost increase
Solution Approach 1:
The ventilation device automatically determines compliance values during the P/V maneuver itself using its own sensors and control unit, eliminating the need for external pre-calculation. The control unit calculates compliance values in real-time based on measured pressure and flow data, making the system self-sufficient and removing the time-consuming pre-calculation step while maintaining reliability.
2Productivity
If respiratory gas pressure is continuously elevated to predetermined end-pressure, then productivity of P/V maneuver is improved, but object-affected harmful factors increase due to lung overdilation
Solution Approach 1:
The control unit continuously monitors compliance values during the inspiration phase and compares them against threshold values. When the compliance value drops below the threshold, indicating approaching overdilation, the system automatically terminates the inspiration phase. This feedback mechanism enables rapid P/V maneuvers while preventing lung overdilation through real-time monitoring and automatic termination.
3Ease of manufacture
If manual determination of compliance threshold values is performed, then manufacturing cost is reduced, but measurement precision and reliability decrease
Solution Approach 1:
The ventilation device automatically determines compliance values during the P/V maneuver using its built-in sensors and control unit, eliminating the need for manual determination. The control unit calculates compliance values in real-time based on measured pressure and flow data, providing precise, patient-specific threshold values without requiring manual intervention or external calculations, thereby maintaining both low cost and high precision.
Data Source
AI summary
A ventilation device for artificially ventilating a patient, having a controller to actuate a flow modifying device for a P/V maneuver while wherein the pressure of respiratory gas is increased during an inspiration phase, wherein respiratory gas passively flows out of the patient during an expiration phase after the pressure increase is terminated, for a plurality of respiratory gas pressures, the respective maneuver respiratory gas volume in the patient from the P/V maneuver is ascertained in connection with the respiratory gas pressure during inspiration and expiration phases; the controller ascertaining a sequence of lung compliance values during the inspiration phase, ascertain a reference compliance value, based on the reference compliance value, determine a termination compliance value in the form of a threshold value as a termination criterion for the inspiration phase, and—terminate the inspiration phase if the termination compliance value is reached or exceeded.