The latch of the spine

 

(57) Abstract:

The invention relates to medicine, is used in traumatology and neurosurgery. The latch includes two plates with through holes, into which enter the bone screws with spherical heads. Last through the threads are connected to the pins, providing the ability to perform reclinate and fixation, including through the use of devices of external transosseous fixation. The technical result - the reduction of trauma intervention and improved treatment outcomes. 2 Il.

The device is used in medicine, specifically in traumatology and neurosurgery, and is intended to reclinate and fixation of vertebral fractures their phone

There are known various devices for transpedicular fixation of the vertebral bodies as, for example, paticularly lock company Stryker (1), which is a set of bone screws with split heads, connected smooth longitudinal rods. Another similar can serve as an internal transpedicular the latch of the spine (2), containing bone screws, connected through a system of clips longitudinal threaded rods.

Both have similar weeks the and spine. Another disadvantage is that the convergence or remove from each other heads of bone screws along the curved longitudinal threaded rods is almost impossible. The angular deviation of the bone screws permitted devices, insignificant, which may be insufficient for carrying out reclinate. In addition to these, a significant drawback of both analogues should be considered that the longitudinal rods, due to the massiveness of the hoops and heads of the bone screws are placed at a distance from the temples. Thus between the longitudinal rods and arms are formed "dead space" that could serve as a depot for streamed blood, and the heads of the bone screws thus are not deep enough under the skin. Both of these devices do not provide opportunities dosed reclinate using the device for external transosseous fixation (UNCF).

The closest in terms of its technical solution to offer is a latch spine Steffee (3), considered as the prototype. The device comprises a plate with longitudinal grooves having segmental countersunk on the outer surface, through which the outer surface of the plate held a threaded stauts on the inner surface of the plate. The bone screws have the opportunity to move along the grooves and to deviate from the axis and for fixing the angle of use washers with beveled surfaces.

The disadvantage of the device, it should be noted that before the operation plate it might be necessary to bend in accordance with the curvature of the spine with the help of a special device. Great inconvenience is a setting beveled washers. The device does not provide the opportunity to provide a smooth dosed reclinate using ANCP. In addition, massive head screws prevent the laying plate directly to the bow (the"dead space"), and the ends of the threaded rods with conical washers and nuts are also not deep enough under the skin.

The invention consists in the combination of essential features, sufficient to achieve the desired technical result - the reduction of trauma intervention and improved outcomes.

The essence is that the plate consists of three departments, located at obtuse angles relative to the adjacent, while each Department has a through opening in its cylindrical part n is poverhnosti plate hole acquires a spherical shape, and opens on the surface of the conically advanced, the bone screws have a spherical head, which along the axis of the screw and diametrically its threaded part, made a hole with a thread corresponding to the threaded end of the rod, bearing on himself cylindrical nut with a lobed Corolla, the peripheral end of the rod has the flats, and the screw collar set collar nut with a cylindrical protrusion corresponding to the diameter of the cylindrical portion of the orifice plate, which, in turn, made axial tapered channel that acquires a spherical shape, return the head of the bone screw.

The execution of the heads of the screws spherical shape gives you the opportunity to reject the threaded part (the axis of the screw) in any direction within the spherical angle, the center of which is the center of the head.

Spherical head allows you to reject the propeller axis at a greater angle than other forms of heads.

Dive head into the thickness of the plate helps to lay it directly on the bow, which eliminates the "dead space".

Rigid threaded connection of the rod with the cylinder and with the use of locknuts provides the possibility dosed reclinate body handicapped the most of the illustrations where in Fig. 1 shows a General view of the device from the side, Fig. 2 is a cross section through the elements of movement and fixation screws.

Plate 1 consisting of three divisions located in relation to each other at an obtuse angle has a through hole 2, starting on the outer surface and an opening on the inside. At the outer surface of the hole 2 is framed by a collar 3, bearing a carving on the surface. Toward the inner surface of the plate 1 hole 2 having a cylindrical shape becomes spherical and opens on the inner surface of the conical extension 4. On the collar 3 posted by cap nut 5 with a cylindrical protrusion 6, placed in the cylindrical part of the hole 2. In a cylindrical flange 6 are axial tapered channel 7, acquires a spherical shape 8. The screw 9 is equipped with a spherical head 10, the diameter of the spherical part of the channel 8, and on top of the head 10 threaded hole 11. In this hole planted threaded end 12 of the rod 13 with the peripheral end of the flats 14. On the threaded end 12 of the rod 13 is placed a cylindrical lock nut 15 with faceted rim 16. In Fig. 1, the dashed line shows the amplitude of the deflection axis of the screw 9 in the cone). The device is manufactured in three sizes.

The device is used as follows.

Naked spinous processes of damaged and at least two up - and underlying vertebrae. Sceletium soft tissue from the spinous processes and adjacent to dujkovic departments. In the through hole 2 of the plate 1 from the outside enter the screws 9 are rigidly connected to the rod 13 by means of nuts 15, transpedicular screwed them into the body of the vertebrae to dive the spherical head 10 in the spherical portion of the hole 2. Plate 1 is installed on both sides of the spinous processes so that the through holes 2 is situated above the arches of the vertebrae. On the collar 3 nazhivljajut the cap nut 5, are reclinate, upon completion of which a coupling nut 5 is fixed with the achieved position. Loosening the lock nut 15, the latter together with the rod 13 is removed.

In the case of the implementation dosed reclinate using ANCP cap nut, leave loose. Epithelial tissue is sutured, leaving the outside ends of the rods 13, which are fixed on ANF. At the end of reclinate through microincision reach the cap nut 5, loosen the lock nut 15 and with it izvlechutsya implants. - France.

2. Internal transpedicular the latch of the spine. The prospectus of the company "Mediatech". - Belarus, Minsk.

3. Steffee, A. et al. Clin. Ortop. in 1986, vol. 203, p. 45-54.0

The latch of the spine that contains a plate with holes, the bone screws with elements of their movement and fixation, characterized in that the plate comprises three departments located at obtuse angles to the adjacent, while each Department has a through hole opening of the cylindrical part of the outer surface plate and framed by a collar threaded on its periphery and toward the inner surface of the plate hole acquires a spherical shape, and opens on the surface of the conically expanded, bone screws have a spherical head, which along the axis of the screw and diametrically its threaded part made the hole with thread, the corresponding threaded end of the rod bearing on the cylindrical nut with a lobed Corolla, the peripheral end of the rod has the flats, and the screw collar set collar nut with a cylindrical protrusion corresponding to the diameter of the cylindrical portion of the orifice plate, which is made of an axial conical channel, purchase

 

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