4mm, said the thread specification, 12-50mm, said there are 12-50mm length, other similar.
. Hollow self-tapping pressurized screw and its use. This hollow pressurized self-tapping screw includes a nail cap (1), a nail body (2), a nail tip (5), a through hole (3) along its axis, and its tip is a self-tapping needle tip. The use of this screw, for patellar fracture first surgical incision reset, followed by Kirschner's pin fixation, along the Kirschner's pin with a hollow tapping screw fixation, and then remove the Kirschner's pin, the wire through the hollow tapping screw line tension band internal fixation. This invention and Kirschner's needle fixation compared to its strength and fixation effect is significantly strengthened, with the wire through the screw hollow in the patellar surface to form a tension band, to achieve a solid internal fixation.
. Cancellous bone screw, belongs to orthopedic medical devices. It includes a screw, the front end of which is provided with a cancellous bone thread, characterized by a section of the screw on the inner side of the screw cap at the tail end and a section of the rear end thread rotating in the same direction as the front end of the cancellous bone thread. The advantage is that it enhances the pressurizing effect of the screw, fills the residual void of the anterior end thread, and prevents distal regression of the nail.
The Feifan Fastening System