Front thoracolumbar fixing system via pedicle of vertebral arch

Abstract

The present invention relating to an inner fixing instrument for pedicle of vertebral arch at forepath used in orthopedics surgical operation includes several bolts and screws of pedicle of vertebralarch in vertebral body, supporting bar and joing lever, of which the bolts are in the structures of bone threaded bolts wit its head end as mechanical thread head and tail end as cylinder head which has radial through hole vertical to axial direction and axial screw hole through with radial through hole as abovesaid at the surface of cylinder heat for locking the screw head threaded in. The structures of abovesaid screws are the same as abovedescribed bolts with the only changes that the head end is pointed shape and the length is shorter than the bolts. The supporting bar is square column orcylinder with with both ends connected in whole with the insertion raised head whic hhas been opened an axial direction flute on it. The joint lever is a straight lever which has the screw lever headat both sides in reversed threading. Two screw lever heads have its own cap nut for each with opening a through hole macthing to bolt head end for bolt head end through and bolt nut screwing.

Description

technical field [0001] The invention relates to an anterior transpedicle internal fixation instrument for orthopedic surgery. Background technique [0002] In the current spinal thoracic and lumbar internal fixation devices, the screws are directly screwed into the pedicles and vertebral bodies, and the fixation method between the screws is connected by metal rods or plates, which is better than the Hardwood rods, Lu's rods and other instruments that are in contact with the surface of bone tissue. The way is better, this point has been generally recognized. In this type of fixation device, whether it is a posterior device or an anterior device, whether it is a steel rod screw system or a plate screw system, its basic structure is "]". The fixation instrument of this type of structure, when it is subjected to pressure or tension, its strongest point is on the axis of the support (or connection) rod, and the longer the arm of force moves towards the screw tip, the weaker the ...

AI Technical Summary

Problems solved by technology

When the posterior column injury loses the effect of the tension band in the case of a three-column fracture, the anterior instrument alone cannot provide sufficient stability, and if the posterior instrument is added at the same time, the fixation stage will be prolonged and unnecessary restrictions will be added to the spine

Therefore, for severe burst fractures of the thoracolumbar spine, no matter what kind of transpedicular posterior approach is used to internally fix the thoracolumbar fractures, the loss of long-term postoperative correction is a complication that is difficult to prevent

At present, there is no ideal device for the treatment of three-column injuries of the thoracolumbar spine

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