This product is connected with vacuum negative pressure system or equipment to remove sputum and other secretions from the respiratory tract. Anti-damage design, including round boss and edge. The round boss makes tip of the product more smooth, which can reduce the friction between the product and the inner wall of respiratory tract of patient. The edge design can prevent the side hole of suction catheter fitting into the inner wall of respiratory tract, to avoid bleeding caused by too large negative pressure in the aspiration treatment. A glove can be equipped to protect nursing staff from infection in the aspiration treatment. Sputum collection bottle can be equipped to collect sputum.