Analgesic pump is a regular quantitative medical equipment for painkillers, also known as analgesic pump. There are many types, but generally by the damping tube, dosing mouth, liquid receiver, protective shell, filters, flow control, protective cover and other components, the injection of painkillers or narcotic drugs. Mainly used for postoperative analgesia, painless childbirth, chronic pain treatment, cancer analgesia, etc., and other need continuous infusion of trace liquid treatment. By the doctor according to the treatment needs to set the appropriate dose, select the type of analgesia pump. In addition, with the PCA (patient-controlled device), so that patients can control the infusion of additional liquid dose, to achieve the purpose of individualized medication. Painkiller Notes Painkillers also have some side effects, but vary from person to person. Some patients with poor anal exhaust defecation, which is to make the intestinal motility weakened (mostly abdominal surgery patients), as well as nausea and vomiting, urinary retention, itching, hypotension, respiratory depression and so on. These are individual phenomena, different patients, the clinical application of the phenomenon are not the same, especially the application of PCA, patients can control their own use, adverse reactions have been controlled.