Suction device for sucking obstruction in respiratory tract and use method therefor

A suction device for sucking an obstruction in a respiratory tract, the suction device comprising:

• a negative pressure generator and a mask,
• wherein the mask is communicated with the negative pressure generator by means of a connector;
• the negative pressure generator comprises a housing and a piston rod movably inserted in the housing, the housing is internally provided with an axially through cavity, an upper end of the housing is provided with an avoidance hole communicated with the cavity, and a lower end thereof is provided with an opening communicated with the cavity;
• the piston rod comprises a push-pull rod and a piston sleeved on the push-pull rod, an upper end of the push-pull rod runs through the avoidance hole, and an outer side wall of the piston is movably and hermetically connected to an inner side wall of the housing by means of a sealing ring;
• an upper side of the mask is provided with a through first connecting cylinder, and a lower side thereof is provided with a flexible annular pad configured to fit with a face of a patient;
• and
• an upper side of the connector is hermetically connected to the opening, and a lower side thereof is hermetically connected to the through first connecting cylinder;
• wherein the mask consists only of a mask body, the through first connecting cylinder, and the flexible annular pad;
• and the mask body includes an internal space that is connected to a lower end of the through first connecting cylinder, and the flexible annular pad is arranged on a lower edge of the mask body;
• wherein a diameter of the push-pull rod is smaller than a diameter of the housing;
• the upper end of the housing is further provided with an exhaust port communicated with the cavity in a way such that when the piston rod is pulled and moves upward, gas in the cavity of the housing is released from the exhaust port to enable a rescuer to pull the piston rod upward;
• and
• wherein the suction device is configured such that after the flexible annular pad of the mask surrounds a mouth of the patient, the mask is able to be held to keep a seal between the mask and the face of the patient, and when the piston rod is pulled upward, a vacuum suction is formed in the cavity of the housing and in the internal space of the mask body through the through first connecting cylinder such that when the mask is lifted to release a negative pressure created by the vacuum suction, a strong suction force in the respiratory tract is formed, and when the piston rod is pushed to a bottommost end, any foreign bodies are discharged while internal air in the housing is discharged.