The anesthesia machine sends anesthesia into the patient's alveoli through a mechanical circuit to form a partial pressure of anesthetic gas, which disperses into the blood and directly inhibits the central nervous system, thus producing the effect of general anesthesia. The anesthesia machine is a semi-open anesthesia device. It is mainly composed of anesthesia evaporation tank, flowmeter, folding bellows ventilator, breathing circuit (including suction and expiratory one-way valve and manual air bag), corrugated pipe and other components.

Defibrillator is a kind of medical instrument which uses strong pulse current to eliminate arrhythmia and restore sinus rhythm through the heart. It is an essential emergency equipment in all departments of hospital. Defibrillation is one of the most important steps in performing CPR.