Bone screw screwing torque is an important parameter used to avoid screw breakage during the screwing process and ensure that the surgeon can easily screw in the screw. The screwing-in torque should be much less than the torsional yield strength of the bone screw and matching screws. The unscrewing torque is used to avoid breakage of the screw during the unscrewing process and to ensure that the doctor
Important parameters for easily unscrewing screws.
Bone screws are used for internal fixation of fractures during orthopedic surgery and are very helpful in fracture treatment and reconstructive surgery. Suitable for different thread types (deep thread, full thread, half thread), different nominal diameters (HA/HB1.5-8.0mm), and different uses (cortical bone screws, cancellous bone screws, cannulated screws).
Basis standards for bone screw torque self-tapping testing machine:
The bone screw comprehensive testing machine is a special testing machine for vertical structures. It is a special testing equipment used to detect the axial pull-out force, screw-in and screw-out torque, self-tapping performance, maximum torsional breaking torque, etc. of metal bone screws. Mainly based on standards:
"YYT 1505-2016 Self-tapping Performance of Metal Bone Screws for Surgical Implants"
"YYT1506-2016 Rotating Torque of Metal Bone Screws for Surgical Implants"
"YYT0591-2011 Bone joint implant metal locking intramedullary nail"
"YYT1504-2016 Axial pullout force of metal bone screws for surgical implants"
"/T0662-2017 Mechanical performance requirements and test methods for metal bone screws with asymmetric threads and spherical lower surfaces of surgical implants" is a test method for testing the breaking torque and breaking torsion angle of metal bone screws according to the standard requirements.
7Y0018-2008 "Osteosynthesis Implant Metal Bone Screws":
6.2.1 Maximum torque and breaking torsion angle;
6.2.3 Axial pull-out force;
6.2.4 Screw-in torque and screw-out torque;
6.2.5 Self-tapping performance