What Is Cancellous Bone Screw

These three screws are called screws for professional purposes and belong to medical devices:

4mm, indicating thread size, 12-50mm, indicating 12-50mm length, others similar.

Hollow self-tapping compression screw and application method thereof. The hollow pressurized self-tapping screw comprises a nail cap (1), a nail body (2) and a nail tip (5). A through hole (3) is provided along the axis line of the screw, and the needle tip is a self-tapping tip. For patellar fracture, open reduction was first used, and then Kirschner wire was used for fixation, hollow self-tapping screw was used along the Kirschner wire, and then the Kirschner wire was removed and wire was used for internal tension band fixation through the hollow self-tapping screw. Compared with Kirschner wire fixation, the strength and fixing effect of the invention are significantly enhanced, and a tension band is formed on the surface of the patella with the steel wire passing through the screw hollow, so as to achieve firm internal fixation.

Cancellous bone screws are orthopedic medical instruments. The screw comprises a screw, and the front end of the screw is provided with a cancellous bone thread, which is characterized by a back end thread rotating in the same direction as the front end cancellous bone thread on the screw inside the tail screw cap. Its advantage is to enhance the compression of the screw, fill the gap left by the front thread, prevent the long - term screw back.