SU1711860A1 - Device for treating the vertebral column fractures - Google Patents

Description

 The invention relates to medicine, namely (C traumatology, and can be used to treat vertebral fractures with displacement of spinal fragments across the width in the frontal plane.

The aim of the invention is to prevent the surfaces of the damaged vertebrae from crushing during reposition by maintaining a constant distance between the spinal fragments displaced across the width in the frontal plane.

FIG. 1 shows a device for the treatment of vertebral fractures, a general view; in fig. 2 - supporting unit; in fig. 3 - centering unit; in fig. 4 - rod with an eye; in FIG. 5, a bracket with an offset axis; in fig. 6 - earring, top view; in fig. 7 - the same side view; in fig. 8 - bolt for clamping spokes.

The device contains support nodes, each of which includes a plate 1, at least two screws 2, a central core 3 of the spinous process fixator and two needles 4.

The central rod 3 passes in the channel 5, made in the thickening 6 of the plate 1 with the possibility of movement across it. At the end of the central rod there is a U-shaped plug 7 adapted to cover the spinous process 8 of the vertebra. At the other end of the central shaft 3, an outer screw is cut 9. The plug 7 has a wide groove 10 for covering the spinous process 8 and two narrow longitudinal (lateral) grooves 11, made in parallel planes and at an angle to the vertical plane. The spokes 4 passing through the narrow grooves are located at a distance from each other and intersect in the spinous process. In this case, one end of the needles 4 is supported by the supporting platform 12 on the smooth side surface 13 of the fork. Screws 2 are designed to fix the body 14 and the vertebral arch 15 and are located on either side of the central shaft 3. The screw 2 has, at one end, interacting with the vertebral body 14, a spin-knob 16, a stop 17, designed to maintain a predetermined amount of screw insertion into the body 14 vertebrae for the entire period of treatment, the smooth surface 17 of the screw is located in soft tissues, and the part of the screw located above the soft tissues, having a thread 19, is inserted into the clip, for example, the bracket 20, and fixed on the support plate 1 with nuts 21 .

The anchor node can be fixed to one or two vertebrae, depending on the performed medical tasks.

When fixing one vertebra, two screws 2 are used, and when two vertebrae are fixed, four screws, respectively. In this case, the fork 7 of the central rod “3 must be fixed on the spinous process of one of the two fixed by screws

vertebrae.

The support nodes are interconnected (Fig. 1) by distractors 22 with the help of hinges 23, fixed on the ends of the plates 1 with a repositioning block and centering

by block. The repositioning block contains a mounting plate 24, through the holes of which the ends of the rod 25 are passed. The other ends of the rod 25 are led through the holes of one of the plates. Rods

secured with nuts 21. Through the holes in the other plate, the ends of two rods 26 with an eyelet are missed. A guide 27 is passed through the holes in the eye bars 26, which is connected to the installation

24 bracket plate,

The centering unit is executed as follows. On central; rods 3. mounted on each plate 1, screwed along One bracket 20 and fastened with nut 21, Through, the holes of two brackets 20 passed a centering rod 28 having threaded parts 29. In the process of reposition, the distance between the plates is metered

screwing the nuts, and turning the center rod is rotated by brackets around its axis along the threaded part 29 of the centering rods 28,

The rod 29 with an eye has a rod with

a thread 30, at one end of which there is a flange 31. On the surface of the flange coaxially with a rod there is an eyelet 32 with a hole 33.

Fig. 5 shows an embodiment.

The bracket is made in the form of an ear 32 with a hole 33. A flange 31 adjoins the end surface of the ear, the axis of which is displaced relative to the ear and passes along its surface. In the center

the flange has a hole with a thread 34. In FIG. 6, 7 shows the shackle, made of the eyelet 32 with a hole 33, the flange 31 of which is adjacent to the end surface, and the flange |

the second eyelet is located at an angle of 90 ° relative to the first eyelet, while this second eyelet also has a hole 33. An earring is used to assemble a two-axis or three-axis hinge.

The bolt for fastening the spokes has a threaded part 35, a hexagonal head 36; a groove 37 is made at the junction of the threaded part with the head, which is located at an angle of 45 ° to the axis of the bolt.

The device works as follows.

. Assembling the support unit begins with screwing about one half of the body 14 of the vertebra of the screw 2 until the stop of the screw 17 in the shackle 15 stops. The opposite end of the screw protrudes above the skin. Similarly, the second screw is screwed into the other half of the vertebral body 14. The spinous process of the vertebra is spanned with a fork 7 of the central stem 3 so that the spinous OTpoCtoK is centered on the wide groove 10 of the fork. One of the spokes is led through a longitudinal narrow groove 11 of the plug 7 and the spinous process at an angle relative to its axis. The end of this knitting needle is pulled out through the puncture of the skin. In the same way, the other needle 4 is conducted through the opposite longitudinal narrow groove 11 of the plug 7. In the spinous process, both needles 4 cross each other. The ends of the spokes 4, which interact with the fork, are fastened to the supporting pads 12, which, after pushing the spokes 4, rest on the smooth surface of the fork. The central rod 3 is mounted in the channel 5 of the plate 1. Next, the central rod is fixed above and below the channel 5 with nuts. At the ends of the screws 2 located above the skin, brackets 20 are fastened, which are connected to the plate. Then alternately fasten the other end of each spoke with a bolt inserted into the hole of the plate and secured with nut 21.

The spokes simultaneously tighten so that the plug 7 is located in the center of the spinous process and rests on the spokes.

For reposition, the spinal fragments displaced along the width move the OR plate of the reference node parallel to the other. This is achieved by moving the guide 27, rotating the nuts 21 along it. To center the device When repositioning, you need to install 9 central rods at the ends of the screw thread using one bracket 20 each, through the holes of which you pass the centering Rod 28 and strengthen it with nuts,

which during reposition metered rotate.

During the reposition of the plate with each other you can not connect distractors, or, if they are connected last, do not

fasten them, and fix the nuts fixing these distractors at a distance between each other, ensuring the free rotation of distractors with parallel

moving plates. After the end of the reposition, the distractors are rigidly fixed with nuts, which can be removed or fixed.

The device allows you to maintain a constant distance (diastasis) between the bone fragments for the duration of the reposition, which prevents the surfaces of the damaged vertebrae from being crushed.

Claims (1)

Formula of gain A device for treating vertebral fractures, comprising supporting nodes with spinous process fixators and brackets, interconnected by distractors, characterized by that, in order to prevent the surfaces of the damaged vertebrae from crushing during reposition by maintaining a constant distance between the vertebral parts displaced across the width in the frontal plane, a centering rod was inserted into it, the anchors were provided with brackets for securing the ends of the centering rod. / hgshgv 1 3 / JO h . - X rig one Ln H shh figb 33 32 J fig 5 . fie.7 37 J5 (rig.v