What device is used to transfer anesthetic gases directly into a patient's lungs?

The endotracheal tube (ET tube) is a crucial device used in anesthesia to ensure that anesthetic gases are delivered directly into a patient’s lungs. This tube is inserted into the trachea through the mouth or nose and serves as an airway conduit, allowing for effective ventilation and the administration of anesthetics during surgical procedures.

The benefits of using an ET tube include its ability to secure the airway, protect the lungs from aspiration, and facilitate positive pressure ventilation. By creating a direct passage to the trachea, the ET tube ensures that anesthetic gases can be efficiently transferred into the lungs, maintaining adequate oxygenation and anesthesia during surgery.

In contrast, other devices like supraglottic airway devices and anesthetic masks do not provide the same level of airway protection and ventilatory control as the ET tube. While the laryngoscope is an essential tool for intubation, it is not used for gas delivery itself. Thus, the endotracheal tube is the preferred method for delivering anesthetic gases directly into the lungs, making it the correct choice for this question.