The anesthesia machine is an artificial respirator that brings anesthetic drugs directly into the patient’s body. Through it, the anesthesiologist can control the amount of anesthetic drugs in the patient’s body and adjust the depth of anesthesia, while the machine displays the oxygen content and carbon dioxide concentration in the patient’s body, and the anesthesiologist has to overcome all kinds of interference to try to maintain the depth of anesthesia and adjust the oxygen and carbon dioxide status in the patient’s body to normal physiological levels. The monitor constantly displays the patient’s blood pressure, pulse, respiration, body temperature, and the concentration of anesthetic drugs in the blood. The anesthesiologist observes these indicators and has to organize the relevant personnel to give the patient blood, fluids and medication at any time to maintain a dynamic balance of these indicators. The degree of trauma of surgery is difficult to predict accurately and the anesthesiologist must be ready for unexpected resuscitation work, such as sudden blood loss, when the anesthesiologist is the main organizer of resuscitation. Some resuscitations are prepared in advance, but unexpected situations cannot be completely excluded. In preparation for a major surgery, anesthesiologists place two tubes into the patient’s arteries and veins and connect them to arterial and venous pressure measuring instruments so that the patient’s arterial and venous blood pressure are displayed in real time on the monitoring equipment during the surgery. More physiological indicators are also displayed on the monitor at the same time, which is also used by the anesthesiologist to make a comprehensive determination, accurate diagnosis, and timely adoption of the correct method to adjust the physiological stability of the patient under anesthesia. For example, body temperature, urine volume, blood sugar, ion balance in the blood, acid-base balance of the body and so on. According to the indicators on the monitor and the preoperative anesthesiologist’s knowledge of the condition, the anesthesiologist should not only adjust the dynamic balance during the operation at any time, but also try to correct and adjust the pre-existing abnormalities caused by certain diseases during the operation. For example, anesthesiologists should organize intraoperative blood transfusions to correct pre-existing anemia; anesthesiologists should organize reasonable infusion components and quantities to correct pre-existing dehydration and ionic disorders; and other primary diseases such as jaundice, low protein, coagulation disorders, etc. will be actively addressed and resolved intraoperatively by anesthesiologists. The infusion pumps are carefully calculated to reflect the anesthesiologist’s will to give the patient blood, fluids, and medications, and require such precise infusion devices. Such an infusion pump is accurate to the extent that one-tenth of a milliliter of fluid can be entered per hour, and this level of refinement greatly guarantees patient safety. Intraoperatively the anesthesiologist gives the patient any of the intravascular measures used in this way.