Postoperative pain relief: Due to medical advances to minimize postoperative pain for patients, postoperative pain relief was invented in the anesthesia discipline. A microinjection pump is used to be worn on the patient’s intravenous infusion line. Different pain medications are placed in the pump according to the scale of the condition and type of surgery, and can be pumped continuously for three days. For more than two decades it has become a routine medical treatment in clinical anesthesia there are no problems affecting the healing of the incision and generally speaking there are no complications.