Neck drainage side holes under reduced pressure cannulated screw system

The present invention relates to a hollow neck-side lag screw hole drainage system under reduced pressure, and particularly to femoral neck fracture and femoral head necrosis, belonging to the field of medical devices for orthopedic surgery. Neck side hole drainage system includes a reduced pressure cannulated femoral neck screw drainage side holes under reduced pressure cannulated screw (1), the first single external suction drainage means (2) and a long external suction drainage means (3), neck-side drainage hole under reduced pressure cannulated screw (1) uniform distribution of the staple body portion drainage pressure side hole (11) and communicates with a hollow tubular structure nail body (10), the neck hole side drainage and decompression cannulated screws Spiketail right side inner threaded bore (9) with an external single-head suction drainage means (2) an outer connector thread (12) cooperating to achieve the external suction drainage device.