SU1232241A1 - Spinal column distractor - Google Patents

Description

The invention relates to the Medida technique, namely to devices for the surgical treatment of the spine, and can be used for the treatment of scolytic disease with non-fixed spinal deformity of the II-IV degree column.

The purpose of the invention is to prevent overgrowth of the spine in the process of correcting its curvature by limiting the limiting effort of distraction.

FIG. 1 shows a spinal distractor, side view in cross section; in fig. 2 is a section A-A in FIG. one.

The distractor contains a rod 1 with hooks 2 and 3 at the ends and a mechanism for moving the hooks with a gear wheel 4 and a spring-loaded lock 5 installed in the hollow body 6 of one of the hooks 3 and in contact with the gear wheel 4. In this case, the gear teeth 7 have an unequal triangle profile with sharp corners at the base. The opposite end of the rod 1, having a thread 8 under the threaded hole of the hook 2, forms a screw pair with the latter.

The distractor works as follows.

During the operation, the hooks 2 and 3 are reinforced by the bows of the corresponding vertebrae, while using a wrench, the surgeon creates a preliminary correction of the spine. After the patient is removed from the anesthesia and in the process of subsequent treatment, an additional dynamic correction of the spine is carried out in the following sequence.

A patient with the help of a doctor and under his direct control does not

how many rotational movements in the spinal column. The gear wheel 4, which interacts with the latch 5, rotates the rod 1 relative to the lower hook 3 only counterclockwise (Fig. 2), and the screw pair of the hook 2 and rod 1 has a frictional torque, which exceeds the friction torque that occurs during rotation of the rod 1 relative to hook 3 clockwise. Due to

this, with rotational movements of the spinal column, the upper hook 2 moves relative to the rod 1 upwards, increasing or maintaining the correction value, and the distractor works like a jack. In the case of an excessively large correction, as a result of which there may be a danger of injury to the elements of the spinal column, the tooth 7, due to its geometry, ensures the rotation of the rod 1 relative to the lower hook 3 clockwise, which automatically stops further correction during subsequent rotational movements. The magnitude of the maximum correction is determined by the geometry of the teeth and screw pair, as well as the design of the retainer.

The use of a sclerosis treatment device reduces the incidence of complications during surgery with simultaneous correction, eliminates the development of hypodynamic disorders and weakens the child’s or adolescent's own muscular corset in the postoperative period, and also allows you to dynamically maintain the correction for the entire period of spinal growth without additional surgical procedures. interventions, which significantly increases the efficiency of treatment of patients and shortens the time frame for their treatment.

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Compiled by L. Solovyov

Editor E. PappTechred I. VeresKorrektor T. Kolb

Order 2492/5 Circulation 660 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (1)

A SPINE DISTRACTOR, comprising a rod with hooks at the ends and a mechanism for extending hooks with a gear wheel, characterized in that, in order to prevent overstretching of the spine during correction of its curvature by limiting the maximum effort of distraction, a spring-loaded lock installed in the hollow is inserted the case of one of the hooks and in contact with the gear, which is mounted on the end of the shaft, while the gear teeth have a profile. unequal triangle with sharp corners at the base.