Realtime Pulmonary Mechanics Estimation Without End Inspiratory Pause
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Solution Overview
Problem
Current methods for estimating inspiratory plateau pressure (Pplt) in ventilated patients require an end inspiratory pause (EIP), which is uncomfortable, inaccurate, and cannot be applied continuously, leading to inadequate monitoring of pulmonary mechanics and potential patient-ventilator dysynchrony.
Innovation Solution
A method and system that calculate Pplt in real time without EIP by using a processor to estimate the expiratory time constant (τE) from exhalation parameters and inspiratory waveform data at a point of low respiratory effort, allowing continuous monitoring of pulmonary mechanics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an end inspiratory pause (EIP) is performed to measure Pplt, then measurement accuracy of Pplt is improved, but patient comfort deteriorates and continuous monitoring is prevented
Solution Approach 1:
The patent replaces the mechanical interruption method (EIP) with a computational approach using mathematical models and signal processing algorithms. The system uses the measured pressure and flow waveforms during normal ventilation to calculate Pplt through integration and differentiation operations, eliminating the need for mechanical pause interruption while maintaining measurement accuracy.
Solution Approach 2:
The patent introduces mathematical models and computational algorithms as intermediaries between the measured respiratory parameters (pressure and flow waveforms) and the desired Pplt value. These computational intermediaries process the continuous waveform data to derive accurate Pplt measurements without requiring physical interruption of the breathing cycle.
2Measurement precision
If an end inspiratory pause (EIP) is performed to measure Pplt, then measurement accuracy of Pplt is improved, but monitoring continuity deteriorates
Solution Approach 1:
The patent enables continuous calculation of Pplt throughout the inspiratory phase by processing the pressure and flow waveforms in real-time without interruption. The mathematical model continuously integrates the flow waveform and differentiates the pressure waveform to provide ongoing Pplt estimates, allowing uninterrupted monitoring while maintaining measurement precision.
Solution Approach 2:
The patent substitutes the discontinuous mechanical EIP method with a continuous computational approach that processes respiratory waveforms throughout normal breathing cycles, enabling uninterrupted monitoring of Pplt without requiring periodic pauses in ventilation.
3Measurement precision
If an end inspiratory pause (EIP) is performed to measure Pplt, then Pplt measurement is obtained, but patient-ventilator synchrony deteriorates
Solution Approach 1:
The patent replaces the mechanical interruption caused by EIP with a computational method that analyzes pressure and flow waveforms during normal patient-ventilator interaction. This substitution eliminates the disruptive pause that causes asynchrony while maintaining the ability to accurately measure Pplt through mathematical processing of continuous respiratory signals.
4Measurement precision
If EIP is applied during controlled mechanical ventilation, then Pplt can be measured, but adaptability to different ventilatory modes deteriorates
Solution Approach 1:
The patent creates a universal measurement method that functions across multiple ventilatory modes (controlled mechanical ventilation, pressure support ventilation, spontaneous breathing) by using a computational approach based on fundamental respiratory physics. The mathematical model adapts to different flow patterns and pressure profiles inherent to various ventilation modes without requiring mode-specific modifications or EIP maneuvers.
Data Source
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AI summary
A system and method of calculating an accurate estimate of pulmonary mechanics of a patient, including but not limited to compliance, resistance, and plateau pressure without modification of ventilator flow pattern. The accurate estimation of pulmonary mechanics is derived from airway pressure and flow sensors attached to the patient using novel mathematical models. These estimated figures for pulmonary mechanics (respiratory system compliance and resistance) are important for monitoring patient treatment efficacy during mechanical ventilation and ensuring alveoli do not over distend to avoid baro- and/or volutrauma, especially in patients with restrictive lung diseases. The subject method of calculating these accurate estimated figures for pulmonary mechanics is based on linear or non-linear calculations using multiple parameters derived from the above-mentioned sensors.