System polysegmental back fixation of a backbone

The system of transpedicular fixation for correction and stabilization of the thoracic and lumbar spine is designed for those cases where it is necessary to fix the thoracic or lumbar spine in traumatic injuries, cancer and degenerative diseases, as well as for the correction of spinal deformities in scoliosis in children structures “.

The system is designed taking into account the large number of wishes of surgeons and taking into account the advantages and disadvantages of such systems that are already used.

 The advantages of the system are:

• small height of a profile of screws over a core that allows to apply it for patients with any physique, including at children;
• the ability to fix the segments of the spine, both in a stationary and in a mobile state along the rods, which allows the spine to grow without losing the correction;
• the use of polyaxial screws, which allows to achieve reliable fixation in cases where it is not possible to perform the introduction of the screw perpendicular to the rod;
• application of a unique design of a cross coupler allows a backbone to grow in width without increase in loading on screws;
• rounded profile of screw heads, which reduces tissue irritation around the system;
• a set of special tools allows you to minimize the installation time of the system and, accordingly, the operation time;
• use of screws both with additional blocking of the internal screw (in special cases where the increased reliability is required) and without it for standard situations;
• the system is made of a biologically inert titanium alloy approved for use in the manufacture of implants.

 The polysegmental system of back fixation of a backbone is intended for fixing of thoracic, lumbar and sacral departments. It consists of mono- and polyaxial screws of various shapes and sizes, connecting rods, pedicular hooks, transverse couplers, including telescopic, and interbody supports (cages). All elements of the implant can be used in various combinations and combined with each other. In particular, the system can be used both for spondylodising surgery and for operations aimed at preserving the patient’s growth. The implants are made of titanium alloy with high corrosion resistance, inertness in biological tissues, the modulus of elasticity of which is close to the parameters of bone tissue, and is resistant to alternating loads. All this determines the tolerance and biocompatibility with the tissues of structures during implantation into the body. To install the structure, universal mounting tools have been developed that allow installation and, if necessary, removal of the implant.

Indications for the use of the system of posterior fixation of the spine are:

• scoliotic and kyphotic deformities of various etiologies;
• traumatic injuries;
• degenerative-dystrophic diseases;
• oncological diseases of the spine and spinal cord;
• stenosis of the spinal canal;
• instability of the spine;
• inflammatory diseases of the spine (tuberculosis, osteomyelitis, etc.)

 The technology of performing surgery using the system of posterior fixation of the spine is to perform surgical access to the posterior vertebral bodies. Then transpedicular screws are installed in the vertebral arches by the method of “free hands”. After determining the place of insertion of the screw, a channel is formed for its conduction, constantly monitoring the course and length. Guided by the measured length of the channel determine the size of the screw. Using a tap in the created channel, cut the thread, checking the integrity of the arc and insert the screw. After installing all the transpedicular screws, they are connected by pre-curved with the help of bending tools corrective rods, which are fixed to them with special nuts, install transverse clamps, stabilize the system.

If the system is installed in the “growing” mode, the bone graft is not used, and the fixation site is left in the “growth mode”. To do this, the internal screw of the screw or pedicular hook is not fully tightened, leaving the possibility of moving the rod, and then locked with a locking nut.

To control the correctness of the implant and the degree of its correction of curvature perform control radiography.

Dynamic neuromonitoring is performed during and after surgery to assess spinal cord function. 

 The effectiveness of the posterior spinal fixation system is the maximum possible restoration of the normal contour of the spine in the frontal and sagittal planes, restoration of the supporting and protective function of the spinal cord, correction of spinal curvature by at least 60%, creation of bone block 3-6 months after surgery.