Zero-dead-space cannula type laryngeal mask respiratory system

The invention relates to a zero-dead-space cannula type laryngeal mask respiratory system which comprises a laryngeal mask assembly, an L-shaped joint, a respiratory filter, a Y-shaped joint and an anesthesia machine connecting pipe. The laryngeal mask assembly comprises a mask body, a laryngeal mask vent pipe, an inflation catheter and an inflation valve. The laryngeal mask assembly comprises themask body, the catheter internally provided with the laryngeal mask vent pipe, the inflation catheter and the inflation valve. The respiratory system is characterized in that an expiration cavity isformed in the axis inside the laryngeal mask vent pipe, an inspiration cavity with the semilunar section is arranged near the outer side of the expiration cavity, a gas sampling cavity is arranged atthe adjacent position of the inspiration cavity and the expiration cavity, the multi-cavity L-shaped joint is communicated with the other end of the laryngeal mask vent pipe, the multi-cavity L-shapedjoint is connected with the