Patients who are not awake, critically ill, elderly and unconscious after anesthesia cannot discharge sputum or vomit due to cough weakness, cough reflex retardation or epiglottis insufficiency, ventilation disorder, etc., which is easy to cause aspiration or suffocation. In particular, the artificial airway established by mechanical ventilation can not clear the secretions of the respiratory tract. Therefore, it is particularly important to clear the secretions of the airway. 1. product overview: The "one-time use closed sputum suction catheter" of Shuangwei brand has changed the traditional open operation mode, avoiding the defects of interruption of ventilator treatment, complicated operation steps, environmental pollution and easy cross infection. Closed sputum suction can be sustained mechanical ventilation to ensure the relative stability of the pressure in the lungs before and after sputum suction; sputum suction in a confined space can reduce the possibility of cross-infection; at the same time, reduce the frequency of tube replacement and the workload of medical staff, and reduce the pain of patients. Therefore, the closed suction catheter (CSC) has high application value, and has been more and more widely recognized by clinical medical staff at home and abroad. 2. product core advantages: 1. Reduce the incidence of respiratory infections Closed sputum suction was significantly lower than the incidence of respiratory tract infections open sputum suction, which is due to the closed sputum suction in the process of sputum suction to ensure the airways closed, significantly reducing the bacteria containing gas capacity glue (aerosol) inhalation. It avoids the contamination of the open sputum suction operation and reduces the chance of exogenous infection. 2. Sustainable mechanical ventilation Open sputum suction should be disconnected from the ventilator, and ventilation and oxygen supply should be interrupted, which will cause hypoxia and aggravate the condition of patients without spontaneous breathing and ARDS. Closed sputum suction is not separated from the ventilator. Preserve lung capacity and ensure alveolar expansion. Therefore, it can maintain the patient's better oxygenation state, keep the hemodynamics relatively stable, reduce the complications caused by the ventilator, and ensure the stability of the patient's condition. 3. Reduce the patient's discomfort Patients with long-term mechanical ventilation are prone to psychological dependence. Therefore, patients often feel fear and irritability when using open sputum suction, and the closed sputum suction tube can suck sputum without offline, giving patients a sense of security. Therefore, compared with the open suction tube, the closed suction tube can reduce the anxiety of patients. 4. Mechanical ventilation sustainable airway humidification For patients with viscous sputum, before sputum suction, humidification fluid can be injected from the humidification injection port, or an extension tube can be used to connect the humidification injection port and the humidification fluid, and the infusion pump can be used to control the small dose of humidification fluid to continuously inject into the airway to achieve continuous humidification. 5. Reduce the workload of medical staff The closed sputum suction tube can be used for up to 72 hours, which reduces a series of operations such as wearing gloves, disconnecting the ventilator, connecting the sputum suction tube, replacing the sputum suction tube with sterile tweezers, and connecting the ventilator when the nurse uses the open sputum suction tube. When the patient's condition changes, the sputum can be suctioned directly, which improves the rescue efficiency of critically ill patients. 6. Reduce occupational exposure of health care workers Compared with the open suction tube,. Closed suction tube has a complete airtight. That is, sputum suction will not affect other patients, medical staff and the surrounding environment due to sputum ejection, avoid cross-infection, and protect the safety of patients and medical staff.