The respiratory circuit of the anesthesia machine is a key component that connects the anesthesia machine with the patient's respiratory tract and plays multiple important roles during the anesthesia process. The respiratory circuit is responsible for delivering anesthetic gas and oxygen to the patient's lungs, and expelling exhaled gases (including carbon dioxide, etc.) from the body. It is like a 'gas channel', ensuring that patients can continuously obtain a mixture of gases containing appropriate concentrations of anesthetics to maintain anesthesia.
From the components of the anesthesia machine's respiratory circuit, the respiratory circuit usually includes an inspiratory branch and an expiratory branch. The function of the inhalation branch is to mix the anesthetic gas evaporated from the anesthesia machine evaporator with carrier gases such as oxygen, and smoothly deliver it to the patient's airway. The components on this path, such as pipes, joints, etc., need to have good airtightness to prevent leakage of anesthesia gas. Otherwise, it may not only affect the anesthesia effect, but also pose a risk to the operating room environment and the health of medical staff.
The exhalation branch is mainly used to collect the gas exhaled by patients. The exhaled gas contains a large amount of carbon dioxide, and the carbon dioxide absorption device on the exhalation branch (such as a sodium lime tank) will play a role in absorbing carbon dioxide through chemical reactions, so that the processed gas can enter the inhalation branch again to participate in circulation (some anesthesia machines use a cyclic breathing circuit), which can save the consumption of anesthetic gas and oxygen, while also maintaining the temperature and humidity of the breathing gas relatively stable, reducing the stimulation to the patient's respiratory tract.
In addition, other components on the respiratory circuit, such as air storage bags, can be used to regulate the volume of respiratory gases to accommodate patients of different weights and respiratory needs; The pressure monitoring device can monitor the pressure changes in the respiratory circuit in real time. Once the pressure is too high or too low, it can promptly alert medical staff to avoid complications such as barotrauma. In short, the respiratory circuit components work together to ensure the safety and stability of anesthesia ventilation process.
