The ex vivo lung perfusion module is an experimental technology platform that maintains lung tissue activity through extracorporeal circulation, widely used in respiratory physiology, pharmacology, and toxicology research. This module simulates the in vivo environment, separates animal lungs from the circulatory system, and maintains their metabolic function through artificial perfusion and mechanical ventilation, providing controllable experimental conditions for studying lung physiological mechanisms and disease models.

　　1、 Module core functions and principles

The core of the ex vivo lung perfusion module is to construct an "extracorporeal pulmonary circulation system". The typical process includes: separating animal lungs (such as rats and rabbits) from the heart, inputting perfusion fluid (such as artificial buffer containing albumin or autologous whole blood) through pulmonary artery catheterization, and mechanically ventilating through tracheal intubation. The perfusion fluid enters the lung tissue through the pulmonary artery and flows back to the fluid storage device through the pulmonary vein, forming a closed-loop circulation. During this process, the module needs to precisely control the perfusion rate (usually 10-15 ml/min), temperature (37 ℃ constant temperature), and gas composition (such as a mixture of oxygen and carbon dioxide) to simulate the physiological environment inside the body.

　　2、 Technological advantages and application value

1. Precise control of experimental conditions: The ex vivo environment can eliminate interference from factors such as nerves and body fluids, focusing on the impact of a single variable on lung function. For example, when studying drug metabolism, the accumulation and distribution of drugs in the lungs can be directly observed to avoid interference from complex metabolic pathways in the body.

2. Multi mode ventilation and perfusion support: The module supports switching between positive and negative pressure ventilation modes to meet the needs of different animal models. For example, negative pressure ventilation is often used to simulate natural respiration in mouse lungs, while large animal models such as rabbits can increase pulmonary artery flow and reduce the risk of pulmonary edema through positive pressure ventilation. In addition, the module supports constant pressure or constant flow perfusion modes, where constant pressure perfusion is more suitable for reducing pulmonary edema caused by vascular constriction as it allows for higher flow rates.

3. Real time data monitoring and analysis: The module integrates pressure sensors, flow meters, and gas analyzers, which can continuously monitor parameters such as pulmonary artery pressure, airway resistance, perfusion fluid pH value, and oxygen partial pressure. For example, in an acute lung injury model, the degree of pulmonary edema can be quantified by analyzing changes in lung compliance; In drug metabolism research, the accumulation and clearance kinetics of drugs in the lungs can be tracked.

　3、 Technical breakthrough and application scenarios of modules

The technological breakthrough of the ex vivo lung perfusion module lies in its multi-mode compatibility. For example, the ALC-M system supports switching between constant current and constant pressure perfusion, with the former being closer to the physiological state and the latter reducing pulmonary edema caused by vasoconstriction. In addition, the module can integrate negative/positive pressure ventilation modes to adapt to different animal models (such as mice to rabbits). In drug development, this module can quantitatively analyze the absorption, distribution, and metabolic processes of drugs in the lungs. For example, by directly injecting drugs through the tracheal dosing channel and monitoring changes in drug concentration in the perfusion fluid with a blood gas analyzer, the uptake rate and metabolic rate of drugs in lung tissue can be accurately calculated.

The ex vivo lung perfusion module, as a key technology platform for modern respiratory research, achieves in-depth analysis of the physiological and pathological mechanisms of the lungs by simulating the in vivo environment and eliminating neurohumoral interference. With technological iteration, modules continue to be optimized in terms of automation control, multi parameter monitoring, and cross species adaptation, providing an irreplaceable tool for drug development, disease modeling, and lung transplant research.