Leak-Compensated PRVC Ventilation for Accurate Lung Mechanics
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Solution Overview
Problem
In pressure regulated volume control (PRVC) ventilation, existing systems fail to accurately compensate for leakage in the patient circuit, leading to inaccurate determination of lung compliance and resistance, which affects the delivery of the desired volume of gas to the patient.
Innovation Solution
The system monitors instantaneous flow and pressure in the ventilation system to model and compensate for both elastic and inelastic leaks, estimating a leak-compensated delivered lung volume and compliance, which is then used to calculate a target pressure for subsequent breaths, ensuring accurate gas delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If leak compensation is not implemented in PRVC ventilation, then the system is simpler to operate, but the determination of lung compliance and resistance becomes inaccurate
Solution Approach 1:
The leakage is segmented into two distinct components: inelastic leak (modeled as flow through a fixed orifice) and elastic leak (modeled as flow through a variable orifice). This segmentation allows each component to be modeled and compensated independently, improving measurement accuracy while maintaining manageable system complexity through modular analysis.
Solution Approach 2:
A leak compensation algorithm acts as an intermediary between the raw flow/pressure measurements and the lung compliance/resistance calculations. This intermediary process separates the actual lung mechanics from the artifacts introduced by circuit leaks, enabling accurate determination of respiratory parameters despite the presence of leakage.
2Manufacturing precision
If traditional PRVC ventilation is used without leak compensation, then the system is easier to manufacture, but gas delivery accuracy deteriorates due to unaccounted leakage
Solution Approach 1:
The system dynamically changes the parameters used in compliance and resistance calculations by introducing leak-compensated flow and volume values. Instead of using raw measured values, the system transforms these parameters by subtracting estimated leak components, thereby improving gas delivery precision without requiring physical modifications to the ventilator hardware.
3Productivity
If leak compensation algorithms are implemented, then ventilation performance is improved, but the system requires more complex measurements and calculations
Solution Approach 1:
The leak compensation system implements feedback by continuously monitoring flow and pressure measurements, estimating leak components based on these measurements, and using the estimated leaks to adjust the calculation of lung compliance and resistance. This closed-loop approach improves ventilation performance by dynamically adapting to changing leak conditions throughout the breathing cycle.
Solution Approach 2:
The system replaces direct mechanical measurement of leak components with computational estimation based on flow and pressure sensor data. Instead of installing separate mechanical sensors to directly measure inelastic and elastic leaks, the system uses mathematical models and algorithms to estimate these components from existing measurements, simplifying the physical measurement requirements while maintaining calculation accuracy.
Data Source
AI summary
This disclosure describes systems and methods for compensating for leakage when during delivery of gas to a patient from a medical ventilator in a pressure regulated volume control (PRVC) ventilation mode. The technology described herein includes systems and methods that compensate the delivery of PRVC ventilation for leakage in the patient circuit by using leak-compensated lung flows as well as respiratory mechanics (lung compliance and lung resistance) estimated in a manner that compensates for elastic and inelastic leaks from the ventilation system.