Device for external fixation of the spine

 

(57) Abstract:

The invention is used in medicine, namely to vertebrology for surgical treatment of injuries and diseases of the spine. Through the roots of the arcs repairwear vertebrae enter screws 1 with lateral grooves 3. In the Central threaded hole 5 in the heads of the screws 1, twist the Central core 9. For each Central rod is placed on two couplings 12 and is conducted through the openings 13 in the coupling 12 transverse and longitudinal rods 10 and 11 with the possibility of their moving. In the installation form repairbuy system for displacement of the vertebrae along the axis of the spine, uniform distraction and compression in the front and rear spine, reclinate spinal strengthening, front and rear, and lateral and rotational displacements of the vertebrae, the bending of the vertebrae to the right and to the left in the frontal plane. After the reduction in the lateral grooves 3 with a circular protrusions 15 and the recesses 14 enter the rod 7 with circular protrusions 15 and recesses 14 for their engagement. Fixed rod 7 relative to the screw 1 locking nuts 8 and remove repairbuy system. 5 Il.

The invention relates to medicine, namely to vertebrology.

Izveni work with a threaded end, cylindrical portion and the mounting end about metric threads [1]. A disadvantage of the known device is that it does not reposition the spine.

Also known latch spine for surgical treatment of injuries and diseases of the spine, containing transverse and longitudinal screw couplers and bone rods, forming together a base in the form of a lever parallelogram with the nodes of the bone fixation rods [2]. The disadvantages of the known devices is the inability to correct the vertebral displacements and complex nodes bone fixation rods.

Closest to the claimed is universal spinal system containing the screw heads with lateral grooves, the outer thread, a Central threaded hole and edge recesses, rods, locking nuts, washers and the Central core [3]. The disadvantages of this design is that reposition the vertebrae is negazirovannoy using various handheld devices. In this case, reposition the vertebrae may not occur in all planes, and hold the vertebrae in deponirovano position until the final fixing is possible only manual str is either the washer with the slots to prevent vyhozhdeniya rods of the side grooves. The disadvantage is that the surface of the lateral grooves and smooth rods, that does not preclude displacement of the rods in the slots in the postoperative period.

The aim of the present invention is the provision of a metered reposition vertebrae in all planes, hold the vertebrae in the position reached at all stages of reduction and prevention of vertebral displacements in the postoperative period.

This goal is achieved by the fact that in the known device, containing the screws on the head with lateral grooves, the outer threaded center hole and edge slots, rods, locking nuts and the Central core, introduced into the Central screw hole according to the invention, it has transverse and longitudinal rods, couplings with holes, forming together with the Central rods repairbuy system of the spine, where the coupling is placed on the Central and longitudinal rods carried out through holes in the coupling of the transverse rods, the lateral grooves in the heads of the screws are located to the axis of the screw at an acute angle, the base and the surface of the rods is made in the form of circular recesses and protrusions and the locking nuts are made on a broad basis.

These from the

In the course of patent information research on this solution was not found, in addition to prototype solutions, which have characteristics similar to declare that leads to the conclusion that there were significant differences in him.

In Fig. 1 shows a screw, locking nut, rod and coupler of Fig.2 - scheme of transosseous osteosynthesis of the spine device mode reposition the side view of Fig.3 - scheme of transosseous osteosynthesis of the spine in the mode of reposition, top view; Fig.4 - scheme of transosseous osteosynthesis of the spine device mode, reposition, rear view, Fig.5 - scheme of transosseous osteosynthesis of the spine device in the lock.

Device for external fixation of the spine consists of screws 1 on heads 2 having lateral grooves 3, an external thread 4, the Central threaded hole 5 and the regional portino 6, rod 7, the locking nut 8, the Central core 9; entered into the Central threaded hole 5, the transverse rods 10, the longitudinal rods 11 and the coupling 12. Couplings 12 are mutually perpendicular transverse proobrazuya holes 13 for holding through them Central 9, 10 cross, longitudinal rods 11 and connecting them together in repairbuy Sosnovaya lateral grooves 3 and the surface of the rod 7 is made in the form of circular recesses 14 and projections 15, and the locking nut 8 have a wide base 16.

The proposed device for external fixation of the spine is used as follows.

Through the open under x-ray control over left and right roots arcs repairwear vertebrae entered the screws 1, and the lateral grooves 3 of the screw 1 is turned on each side to the midline to the opposite screws 1. In the Central threaded hole 5 in the heads of the screws 1 threaded Central rod 9. Over the heads of 2 screws 1 on the Central rod 9 is freely fit the locking nut 8. For each Central rod 9 is placed on two couplings 12, one of which is placed over the locking nut 8 and the second closer to the free end of the Central rod. Through the second openings 13 in the coupling 12 are transverse rods 10 so that one of the transverse rods 10 pass through the coupling 12, which are located in front of the Central rod 9, and the other transverse rods 10 are held through holes 13 of the coupling 12, located at the free end of the Central rod 9. When conducting cross rods 10 through the openings 13 of the coupling 12, located at the free end of the Central rod 9 on Sered is than necessary in front of the Central rod 9, it also fits on the clutch 12. Installation repairwoman system spine ends to the two longitudinal rods 11 through the openings 13 in the coupling 12, which are located at the ends of the transverse rods 10, which is in front of the Central rod 9, and one longitudinal rod 11 through the openings 13 in the coupling 12, is placed on the middle of the transverse rod 10 passing through holes 13 in the coupling 12, located at the ends of the transverse rods 9. Designed transosseous osteosynthesis of the spine in the mode reposition allows displacement of the vertebrae in all planes.

So, according to the scheme of transosseous osteosynthesis of the spine device mode position shown in Fig.2, the change of the distance between corresponding couplings 12 along the axis of the longitudinal rod 11 is achieved by displacement of the vertebrae along the axis of the spine. While the same increase in the distance between the coupling 12 to howl longitudinal rods 11 provides an even distraction in the anterior and posterior divisions of the spinal cord, and the same reduction of the distance between the coupling 12 to howl longitudinal rods 11 gives uniform compression in the anterior and posterior divisions of the spinal cord. This same pattern is it 10, which are located at the ends of the Central rod 9, allows reclinate spine. This is being achieved by increasing distance along the longitudinal bars 11 between the sleeves 12, located at the ends of the transverse rods 10, which are located in front of the Central rod 9. Reclinate spine can not only perform, but also to strengthen the simultaneous increase of the distance between the coupling 12 and the longitudinal rods positioned close to the vertebrae and decrease when the distance between the coupling 12 and the longitudinal rods 11 that are further away from the vertebrae. Reducing the distance between the coupling 12 and the longitudinal rods 11, which is located in front of the Central rod 9, produces kittyrobbie operated spine. In addition to these vertebral displacements under schemes of transosseous osteosynthesis of the spine device mode position shown in Fig.2 and 3, movement of the Central rod 9 in a horizontal plane in the coupling 12 with respect to all of the longitudinal rods 11 allows the front and rear displacement of the vertebrae, and unilateral lateral movement of the United motionless between 9 and a Central transverse rod 10 relative activities is to the right.

According to the scheme of transosseous osteosynthesis of the spine in the mode position shown in Fig,3 rotational displacement of the vertebrae are produced simultaneously in a circular movement clockwise or counterclockwise Central rod 9 and the transverse rods 10, which are located further away from the vertebrae by howling couplings 12, located on said rods with the immutable position of all longitudinal rods 11 and the transverse rod 10 that is closer to the vertebrae.

According to the scheme of transosseous osteosynthesis of the spine in the mode position shown in Fig.4, the distance between the sleeves 12 on the left longitudinal rod 11 and the longitudinal rod 11 located on the middle of the transverse rod 10 located at the free end of the Central rod 9 allows the slope of the overlying vertebra to the right in the frontal plane. Similarly can be carried out slope of the overlying vertebra to the other side. The slope of the overlying vertebra in the frontal plane to the right may be effected by reducing the distance between the sleeves 12 on the right of the longitudinal rod 11 and the longitudinal rod 11 located on serego vertebra and left.

After you have completed the necessary reposition the vertebrae is fixation surgery of the spine, which runs as follows: in the lateral grooves 3 heads 2 screws 1, located on each side of the midline of the spine are input rod 7, after which the male thread 4 heads 2 screws 1 screw being free position in front of the transverse rods 9 locking nut 8 with a broad base 16, which as screwing immersed rod 7 to the bases of the lateral grooves 3 of the head 2 of the screw 1. When the final tightening of the screws 8, the circumference of their wide bases 16 enters the recess 14 of the rods 7, and the surfaces of the bases of the lateral grooves 3 of the head 2 of the screw 1 and the surface of the rods 7 tight contact between them due to the fact that the Foundation of the lateral grooves 3 heads 2 screws 1, and the surface of the rods 7 have the same circular recesses 14 and projections 15. The decline in the recess 14 in the base of the lateral grooves 3 of the head 2 of the screw 1 of the projections 15 on the surface of the rods 7 and the projections 15 provided on the basis of the lateral grooves 3 of the head 2 of the screw 1, the grooves 14 of the rod 7, in addition to the close contact of the screw 1 with the rods 7, excludes also the displacement of the rod 7 relative to Vitosolic remove repairwoman system device for transosseous osteosynthesis of the spine, the wound is sutured and the operation ends.

The use of the invention in comparison with the prototype will allow you to:

1. To perform dosed reposition vertebrae in all planes,

2. To perform a reliable fixation surgery of the spine.

3. To simplify the device for transosseous osteosynthesis of the spine,

4. To exclude the use of more complex structures to perform reposition the vertebrae after the introduction of external screws in the body of the vertebrae.

5. To avoid displacement of the vertebrae in the postoperative period.

On the day of filing of the present invention developed a prototype device for percutaneous osteosynthesis of the spine and clinical testing.

Device for transosseous osteosynthesis of the spine, containing the screw heads with lateral grooves, the outer thread, a Central threaded hole and the edge of the slot, the rod, the locking nut and the Central core, introduced into the Central threaded hole of the screw-heads, characterized in that it has transverse and longitudinal rods, couplings with holes, forming together with the Central is on a sharp angle, and their base and the surface of the rods is made in the form of circular recesses and protrusions and the locking nut with wide bases.

 

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