Physiological Lung Simulator With Membrane Gas Exchange for Ventilator Tests
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Solution Overview
Problem
Existing ventilator testing methods, such as those using animal models or mechanical lung simulators, fail to accurately replicate the physiological functions of human lungs, particularly in simulating gas exchange and mechanical movements, which is crucial for ensuring safety and efficacy.
Innovation Solution
A lung simulator with a gas loop system that includes devices for setting O2 and CO2 concentrations, simulating mechanical lung movements, and optionally using a flushing gas to mimic gas exchange through a membrane, allowing for partial simulation of lung functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If animal models or simple mechanical lung simulators are used for ventilator testing, then device complexity is reduced, but measurement precision and reliability of simulation are insufficient
Solution Approach 1:
The lung simulator is divided into multiple independent functional modules: a gas loop system for breath delivery, a gas exchanger module with membrane for O2/CO2 exchange, a flushing gas course for membrane perfusion, and control systems. Each module can be independently adjusted and tested, allowing complex physiological simulation while maintaining modular device structure that facilitates manufacturing and maintenance.
Solution Approach 2:
A membrane-based gas exchanger is introduced as an intermediary component between the breathing gas and flushing gas courses. This membrane selectively permits O2 and CO2 diffusion while maintaining separate gas pathways, enabling realistic gas exchange simulation without requiring complex biological tissue structures. The membrane acts as a simplified mediator that captures essential lung function.
2Adaptability or versatility
If a membrane-based gas exchanger is implemented, then simulation of gas exchange function is improved, but device complexity increases
Solution Approach 1:
The membrane-based gas exchanger serves multiple functions simultaneously: it enables O2 diffusion from breathing gas to flushing gas, facilitates CO2 diffusion in reverse direction, provides a surface area for gas exchange, and acts as a selective barrier between two gas pathways. This multi-functionality reduces the need for separate components for each gas exchange function, thereby limiting complexity increase.
Solution Approach 2:
The system allows dynamic adjustment of gas exchange parameters including O2 and CO2 concentrations in both breathing and flushing gases, membrane surface area exposure, and gas flow rates. These parameter changes enable versatile simulation of different physiological conditions (rest, exercise, disease states) without requiring physical reconfiguration of the device structure.
3Measurement precision
If multiple gas courses and concentration setting devices are added, then measurement precision of physiological parameters is improved, but ease of operation deteriorates
Solution Approach 1:
The lung simulator incorporates sensors that monitor O2 and CO2 concentrations in both the breathing gas loop and flushing gas course. These measurements provide feedback to control systems that automatically adjust gas flow rates and concentrations to maintain target physiological values. This closed-loop control ensures precise parameter control while reducing manual intervention complexity.
4Reliability
If the lung simulator is designed to closely replicate human breathing, then reliability of ventilator testing is improved, but loss of time for setup and configuration increases
Solution Approach 1:
The lung simulator is pre-configured with predetermined gas flow rates, O2 and CO2 concentrations, and membrane exposure parameters that replicate standard physiological conditions. Common testing scenarios (resting state, mild exercise, disease states) are pre-programmed, allowing operators to quickly select and initiate tests without manual configuration of each parameter, thereby reducing setup time while maintaining physiological accuracy.
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
Enables reliable testing of ventilators by accurately simulating gas exchange and mechanical lung movements, reducing the need for animal testing and enhancing training and development of ventilator systems.
Implementation Method 1
the membrane is permeable at least to CO2 and/or O2 and/or N2... O2 molecules and/or CO2 molecules and/or N2 molecules pass from the breathing gas into the flushing gas and/or from the flushing gas into the breathing gas along the membrane
Data Source
AI summary
A lung simulator for partial simulation of functions of a lung, comprising at least one gas loop which is connected to a ventilator which is configured to convey a breathing gas into and/or out of the gas loop at least temporarily. The lung simulator comprises at least one device for setting the O2 concentration of the breathing gas in the gas loop, at least one device for setting the CO2 concentration of the breathing gas in the gas loop and at least one device for simulating a mechanical lung movement.