RU30564U1 - Tubular bone defect replacement apparatus - Google Patents

Abstract

An apparatus for replacing defects of tubular bones, comprising base and intermediate supports connected by spokes with spokes, an electric drive and fastening elements, characterized in that the electric supports are equipped with intermediate support distractors, each of the electric drives being made in the form of a housing fixed to one of the base supports and equipped with ears arcuate grooves and coaxial holes for the working end of the distractor, as well as placed in the motor housing with a shaft in contact with the working end of the distractor and by the worm gear.

Description

DEVICE FOR REPLACEMENT OF TUBULAR BONE DEFECTS

A utility model - an apparatus for replacing defects of tubular bones relates to medical equipment, in particular to devices used for the surgical treatment of patients with orthopedic and traumatological profiles.

Known compression and distraction apparatus (1), containing, in its version for the replacement of defects of tubular bones, the base and intermediate supports with spokes fixed to them, connected by distractors.

A compression-distraction apparatus (2) is also known, in which the distractors connecting the supports are connected by a flexible element and are equipped with an electric drive. However, this device is intended mainly to increase the longitudinal dimensions of the segments and cannot be used to replace defects of long tubular bones. In addition, the relationship of the electric drive with the supports due to the flexible element does not provide the possibility of angular rotation of the supports and, thus, correction of the axis of the bone in the defect zone.

The objective of the utility model is to develop an apparatus that provides metered compensation for the defect in the tubular bone in automatic mode and corrects the angular position of the moved fragment.

This problem is solved by the fact that in the apparatus for replacing defects of tubular bones, containing the base and intermediate supports connected by spokes, the electric drive and fasteners, the electric supports are equipped with intermediate support distractors, each of the electric drives being made in the form of Anatoly Aleksandrovich Lanynin fixed to one of the baskas Dmitry Aleksandrovich

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output bearings of the housing, equipped with ears with arched grooves and coaxial holes for the working end of the distractor, as well as placed in the motor housing with a shaft in contact with the working end of the distractor through a worm gear.

The inventive utility model is illustrated by a diagram and description,

The attached diagrams show:

FIG. 1 - apparatus for replacing defects of tubular bones, General view.

FIG. 2 - electric drive housing.

FIG. 3 is a diagram of an electric drive device.

The apparatus for replacing defects of tubular bones contains a base 1 and an intermediate support 2 with spokes 3 fixed to the supports using spoke fixators 4. The basic supports 1 are interconnected by distractors 5, and the intermediate support 2 is interconnected with one of the basic supports 1 using distractors 6, each of which is equipped with electric drives 7 having control and power units (not shown in the diagrams). The actuators 7 are made in the form of a housing 8, equipped with flanges 9 with arcuate grooves 10 for fastening elements and coaxial holes 11 for the threaded end of the distractor 6. Inside the housing 8 there is an electric motor 12 with a shaft 13, which is contacted by the worm gear 14 with the end of the distractor 6. Parts of the apparatus and the electric drive housing are interconnected using fasteners in the form of bolts 15, nuts 16 and spherical washers 17.

The device is used as follows.

After anesthesia, osteosynthesis of the affected segment of the limb is performed using well-known techniques, with holding knitting needles 3 through the main bone fragments and the bone fragment formed as a result of osteotomy. The ends of the knitting needles 3 are fastened with special fixators 4 to the base supports 1, which are connected to each other by the distractors 5. In addition, on one of the base supports 1 adjacent to the defect zone 1, the electric drives 7 of the distractors 6 of the intermediate support 2 are attached. Fastening is carried out with

using fixing bolts 15, which are inserted into the arcuate grooves 10 in the ears 9 of the housings 8. Before tightening the fixing bolts 15 with the nuts 16 in the grooves 10, the housings 8 of the electric drives 7 are turned so that the distractors 6 introduced into the holes 11 are oriented along the holes of the intermediate support 2, after which the latter is displaced relative to the knitting needles carried through the formed bone fragment 3. Having fixed the latter, the support 2 is stabilized both by rigid fixation on the adjacent support 1 of the buildings 8 of the electric drives 7, and by I distractors 16 fastening nuts 6. In this case, if during the planned replacement defect correction of the axial position of the formed piece, the distracters 6 is connected to the support 2 by means of spherical or additionally schayb 17 mounted hinge assemblies (not shown in the diagram).

After completing the installation of the apparatus, the actuators 7 are connected to the control units (set the rate of distraction) and power. The operation of the electric motor 12 through the shaft 13 and the worm gear 14 is transmitted to the distractor 6, causing it to rotate and, thus, the support 2. The uniform movement of the distractors of the specified support causes a longitudinal movement of the selected bone fragment in the defect, which leads to its replacement . If, in the course of moving a fragment, the need arises for its angular deviation, the latter is achieved by setting a different speed using the control unit for the support 6 of the distractors 6. Upon completion of the correction of the position of the moving fragment, the distraction rate is again equalized. The dismantling of the apparatus is carried out in the reverse order.

Using the apparatus provides dosed compensation of the defect of the tubular bone in automatic mode and the correction of the angular position of the moved fragment.

1. Shevtsov V.I., Makushin V.D., Kuftyrev L.M. / Defects of bones of the lower limb. - Kurgan, 1996.S. 323.

2.A.S. USSR No. 1122308, publ. 11/07/84., Bull. No. 41 ... / Baskov Anatoly Alexandrovich / Lapynin Dmitry Alexandrovich (J,

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Claims (1)

An apparatus for replacing defects of tubular bones, comprising base and intermediate supports connected by spokes with spokes, an electric drive and fastening elements, characterized in that the electric supports are equipped with intermediate support distractors, each of the electric drives being made in the form of a housing fixed to one of the base supports and equipped with ears arcuate grooves and coaxial holes for the working end of the distractor, as well as placed in the motor housing with a shaft in contact with the working end of the distractor and by the worm gear.