An airbag tube apparatus has a hollow tube with a closed end and an open end. A side hole is disposed near the closed end； when matter leaves the airbag tube apparatus, it enters the hollow tube from the side hole and flows out of the open end. A balloon is attached to the hollow tube, and connected to a vent. The balloon in a large volume can flexibly fix animal tissue. A vent is connected to the balloon, a valve, and a pneumatic module to form an air inflator to inflate, hold and deflate the balloon. The valve opens and closes the liquid flow in the vent, and is controlled by a circuit module； the pneumatic module, providing inflating function, is controlled by the circuit module； the circuit module, has a microprocessor unit, a memory unit and an input-and-output unit.
