Obturator

The invention discloses an obturator, and belongs to the technical field of medical instruments. The obturator comprises an inner pipe assembly, an outer pipe and a plunger assembly. The inner pipe assembly is provided with distal openings and an inner channel extending in the length direction of the obturator. The outer pipe is sleeved on the inner pipe assembly to form an outer channel that extends in the length direction of the obturator. The ends of the outer pipe and the inner pipe assembly are simultaneously connected to the plunger assembly. The plunger assembly is provided with an instrument hole and a gas hole which are used for communicating with the outside. The instrument hole communicates with the inner channel to form an instrument channel through which an instrument penetrates. The gas hole communicates with the outer channel to form a gas channel for gas circulation. The distal openings respectively communicate with the gas channel and the instrument channel. Since the gas channel and the inst