Physical Lung Simulator with Variable Airway Volumes
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Solution Overview
Problem
Current lung simulators for training clinicians on mechanical ventilation lack comprehensive realism, failing to accurately simulate respiratory mechanics, gas exchange, and heart-lung interaction, necessitating the use of animals for more realistic training.
Innovation Solution
A physical lung simulator with expandable compartments, variable airways, and a coupled heart element that mimics human physiology, including realistic gas exchange and blood pressure measurement, allowing for simulation of both active and passive respiratory states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current lung simulators are used for training clinicians, then training can be conducted without animals, but the simulators fail to provide realistic physiological response including gas exchange and heart-lung interaction
Solution Approach 1:
The lung simulator is divided into multiple expandable compartments (alveolar compartments) that can independently simulate different lung regions. Each compartment has its own gas exchange characteristics, allowing realistic simulation of ventilation-perfusion mismatches and shunt effects without requiring an overly complex monolithic structure
Solution Approach 2:
A coupled heart element acts as an intermediary between the lung compartments and the external environment, simulating blood flow and gas exchange. This intermediary component enables realistic heart-lung interaction and physiological response without directly complicating the lung structure itself
2Reliability
If animals are used for training, then realistic physiological response is achieved, but ethical concerns and availability issues arise
Solution Approach 1:
The invention creates a physical copy of the human respiratory system with expandable lung compartments that replicate actual lung mechanics and gas exchange properties. This copy includes tracer gas injection systems that mimic metabolic CO2 production, providing animal-free training with realistic physiological response
Solution Approach 2:
The simulator allows dynamic adjustment of physiological parameters including compliance, resistance, dead space volume, and gas exchange rates. These parameter changes enable the simulation of various pathological states (ARDS, pneumonia, pulmonary embolism) while maintaining physiological realism without using animals
3Measurement precision
If multiple air conduits of different volumes are used, then realistic gas exchange simulation is achieved, but device complexity increases
Solution Approach 1:
Different air conduits connecting the expandable compartments have different volumes and resistance characteristics, creating local variations in gas flow patterns. This local quality differentiation enables realistic simulation of ventilation distribution across different lung regions, accurately reflecting physiological gas exchange without requiring excessive complexity
Data Source
AI summary
The invention relates to a lung simulator apparatus, as well as to a method to ventilate a lung simulator with a ventilator. The lung simulator apparatus comprises an air chamber with a variable volume for an exchangeable gas, which air chamber is connected in parallel with two air conduits, and a gas exchange element for injecting a tracer gas into the air chamber, wherein the volumes of the air conduits are substantially different. The method of simulating lung function comprises filling a first gas into the air chamber, which has a variable volume and which is connected in parallel with the two air conduits, and injecting a second gas into the air chamber, pressing the first and second gas out of the air chamber, and optionally repeating these steps.