The invention discloses a negative-pressure thoracocentesis remaining needle. The negative-pressure thoracocentesis remaining needle comprises a remaining
catheter, a puncture needle and a negative-pressure device, wherein a mounting hole is formed in the remaining
catheter, the puncture needle is movably connected to inside of the mounting hole, and a
check valve I is connected with the right endof the puncture needle; the negative-pressure device is of a hollow structure, a fixed plate, a screw and a
piston are arranged in an inner cavity, the fixed plate is vertically fixed on the left side of the inner cavity, the left end of the screw is rotationally connected with the middle of the fixed plate, the outer wall of the
piston is in attached connection with the inner wall of the negative-pressure device, a nut is fixed in the middle of the
piston and is in threaded connection with the screw, limiting blocks are arranged at two ends of the piston, and limiting grooves are symmetrically formed in the inner wall of the negative-pressure device; and a cover plate is in inlaid connection with the right end of the negative-pressure device, a motor is mounted on the cover plate, and aninlaid sleeve is connected to a
power output end of the motor. The small negative-pressure device is connected to the
tail end of the puncture needle, and the negative-pressure device has a small size, is convenient to operate and can play a quite good assisting effect on thoracocentesis.