Disposable infusion pumps are reliable medical device, designed for single use in hospital, and intended for general infusion use. Routes of infusion include intravenous, percutaneous, and subcutaneous. SCW infusion pump is divided into two types: continuous type A and Patient-Controlled Analgesic Infusion Pump, which continuously injects the patient with safe, effective, micro-amount, continuous and uniform injection of medicine through the micro-tube to achieve analgesic effect. By using Patient-Controlled Analgesic Infusion Pump, patients can add drugs independently according to the pain situation as this product is intended for patient-controlled analgesia infusion using the integrated bolus button, general infusion uses including pain management for preoperative, perioperative, postoperative surgery.