Ventilator PEEP Control via Transpulmonary Pressure Modeling
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Solution Overview
Problem
Current mechanical ventilator systems are cumbersome and lack real-time assessment of alveolar recruitment, requiring continuous observation to prevent over distention, atelectasis, or cyclic shearing of alveoli, and rely on static observations of lung volume and applied pressure, which are inadequate for dynamic adjustment of positive end-expiratory pressure (PEEP) levels.
Innovation Solution
A mechanical ventilator system that includes a pressure generator, sensors, and hardware processors to dynamically determine tidal volume, transpulmonary pressure, and lung volume, allowing for real-time adjustment of PEEP levels based on a pressure-volume curve, thereby facilitating automatic lung recruitment and reducing the need for manual recruitment maneuvers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If static observations of lung volume with applied pressure are used to control PEEP, then device complexity is reduced, but measurement precision and real-time assessment capability deteriorate
Solution Approach 1:
The patent replaces static mechanical observation methods with dynamic computational modeling. The system uses measured pressure and flow data combined with an exponential decay model to calculate lung volume in real-time, substituting complex mechanical measurement systems with a computational approach that achieves both precision and ease of implementation
Solution Approach 2:
The patent introduces an exponential decay model as an intermediary between pressure measurement and lung volume determination. This mathematical model serves as a mediator that transforms easily measurable pressure and flow data into accurate lung volume estimates without requiring direct complex volumetric measurement systems
2Ease of operation
If manual observation and adjustment of PEEP levels are used, then ease of operation is reduced, but device complexity is minimized
Solution Approach 1:
The patent implements a closed-loop feedback system where lung volume measurements continuously inform PEEP level adjustments. The system automatically monitors lung volume in real-time and adjusts PEEP to maintain optimal lung recruitment, eliminating the need for manual observation and adjustment while keeping the control algorithm relatively simple
Solution Approach 2:
The ventilator system performs self-adjustment of PEEP levels based on its own measurements and the exponential decay model. The system serves itself by automatically determining optimal PEEP levels without requiring external manual intervention, thereby improving ease of operation without proportionally increasing complexity
3Reliability
If continual observation of the patient is performed to prevent alveolar damage, then productivity is reduced, but reliability is improved
Solution Approach 1:
The patent replaces manual continual observation with automated computational monitoring. The system uses pressure and flow measurements combined with exponential decay modeling to continuously assess lung volume and detect potential alveolar damage, maintaining high reliability while freeing caregivers for other tasks
Solution Approach 2:
The system provides continuous automated feedback on lung volume and recruitment status, enabling real-time detection of alveolar damage risks without requiring constant manual patient observation. This feedback mechanism maintains patient safety while improving caregiver productivity
Data Source
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AI summary
The present disclosure pertains to a system (10) configured to automatically set the positive end expiratory pressure (PEEP) during mechanical ventilation (800). The system uses a measured relationship between transpulmonary pressure and lung volume (804) to set PEEP (808) such that mechanically assisted breaths are delivered more effectively to open airways (e.g., tidal breaths will be delivered to airways that consist of alveoli that have not contracted or collapsed at the end of expiration) (810). Furthermore, the system is configured to sense (18, 804) when the lungs may be either hyperextended and/or undergoing cyclic atelectasis in order to prevent trauma or injury to the lung's fibrous tissue. The system is configured to perform recruitment and/or continuous monitoring and adjustment of the PEEP setting to maintain an open lung.