Лунев Юрий Константинович (RU),Грамолин Константин Васильевич (RU),Грушевский Никита Викторович (RU)
申请号：
RU2014145659/14
公开号：
RU00154118U1
申请日:
2014.11.13
申请国别(地区):
RU
年份:
2015
代理人:
摘要：
The invention relates to medicine, namely to the Spine, neurosurgery, orthopedics, traumatology, in particular to the field of polyaxial pedicle screws and nuts that make up the spinal fixation devices. Summary of the utility model is that the device polyaxial pedicle screw comprises a proper screw head, the insertion and lock-nut. The screw has a working part with a thread on one end and a spherical thickening at the other end and is mounted in a head having a through bore with an internal thread and abutment rectangular groove with a width that allows to insert the longitudinal rod. Wherein the screw is rotatable relative to the head, and it is contained thickening spherical element allowing to create torque relative to the screw axis. The head mounted insert, preventing loss of the screw from the head and having on one side a spherical surface corresponding to the spherical thickening of the screw on the other side a groove to be mounted in it a longitudinal rod and with sides which are in contact with the interior of the head two oppositely disposed blind holes, being aligned with these openings are arranged in the head other two blind holes. The nut-lock comprises an outer rectangular abutment thread corresponding to the internal thread on the head and the element that allows to apply torque to screw the nut into the head. At the end of the nut-lock, which may come into contact with the longitudinal rod annular rib performed. For a better fit of the annular rib to the longitudinal rod and better lock the rod in the head, the annular rib surface roughness may be formed into two classes lower than the surface roughness of the remaining lock-nut and the annular rib may have an angle of 90 °. The thread profile of the working part of the screw is variable and a scalene trapezium. The outer diameter of the working part of the screw is constant, but decreases from the inner to the tip of the head. On the head an annular groove and a trapezoidal four ledge. All parts
