SU1517953A1 - Apparatus for perosseous osteosynthesis - Google Patents

Abstract

The invention relates to medicine and is intended to increase the reliability of fixation of bone fragments during osteosynthesis. The device is made of a material with a shape memory effect. When installed in the bone and heated, the portions 5 of the male element 2 are wedged in the holes 4 of the clamp 3 of the female element 1. The female 1 and the male 2 are enlarged in lateral size. In the recesses 7 of the outboard ends 6, the spokes 8 are wedged. And on the annular grooves 9, supports are fixed in the form of rings 10 with legs 11 for support on the bone. Moreover, the rings have a phase transition temperature greater than the rest of the device. 4 il.

Description

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This invention relates to medicine, in particular to traumatological instruments for the treatment of tubular bone fractures.

The purpose of the invention is to increase the reliability of fixation of bone fragments during osteosynthesis.

FIG. 1 shows a device for transosseous osteosynthesis, a longitudinal section; in fig. 2 - the same, side view; in fig. 3 is a section A-A in FIG. one; in fig. 4 is a section BB in FIG. one.

The device for transosseous osteosynthesis contains female 1 and male 2 elements with a common axis of symmetry, which have the possibility of changing the transverse size. The covering element 1 has a retainer 3 with holes 4 for sections 5 of the male element 2. Each element has an outboard end 6 with a recess 7 under the needle 8. On the grooves 9 there are rings 10 fitted with arcuate legs I, bent in opposite directions. The diameters of the holes 4, the depressions 7, the rings 10 are respectively smaller than the diameters of the sections 5, and the points 9 and the spokes 8, to ensure their fixation due to jamming.

The device is made of a material with a shape memory effect, for example, titanium nickelide, and the phase transition temperature of the rings 10 with legs 1 I is greater than the rest of the device. This ensures, due to the effect of shaping in the process of heating the device .10 body temperature, the sequential restoration of the initial, 1 (i.e., predetermined) form of the device in the working position: first, 1e, areas 5 are fixed in the opening 4 of fixtures 3, covering 1 and covered 2 elements are diluted and the pins 8 are fixed in the recesses 7, and then the rings 10 are fixed on the grooves 9 and the arched bends of the legs I 1 are restored after the preliminary opening of the holes 4 of the pins 3 1 and straightening the legs 11 in the cooled state.

Device for transosseous osteosynthesis works as follows.

The device is cooled, for example, by spraying with chloroethyl, the diameter of the holes 4, rings 10, recesses 7 is increased, the transverse size of the device is reduced, and the legs 11 are straightened. Then, covering 1 and covered 2 elements are sequentially inserted into about 0

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the drilled canal in the mapped bone fragments, installing the sections 5 of the male element 2 in the holes 4 of the latches 3, while the outboard ends 6 are located outside the bone. In the recess 7 of the outboard ends 6, the spokes 8 are installed. When the device is heated to body temperature, a memory effect appears and the device tends to take a predetermined (i.e., initial) shape — first fixing sections 5 in the holes 4 of the fixtures 3 and the needles 8 in the recesses 7 of the outboard ends 6 by reducing the diameter of the holes 4 and the recesses 7, as well as an increase in the transverse size of the device. In this case, the device is firmly fixed in the bone fragments. Next, the original shape of the ring 10 with legs 11 is restored. At the same time, the diameter of the holes of the rings 10 decreases and they are fixed on the grooves 9, and when the arcuate bends of the legs 11 are restored, they come into contact with the bone fragments, ensuring their constant dynamic compression.

The ends of the spokes 8 are installed in the spokes of the external fixation device. When the device is not used in conjunction with an external fixation device, the spokes 8 are not used.

After the treatment is completed, the bony ends 6 bite or cut down and parts of the device are removed from the bone.

Claims (1)

Invention Formula A device for transosseous osteosynthesis, containing coaxial, interconnected covering and covering elements, made on the plate ends with supports, wherein the covered element is made of a material having a shape memory effect, with the possibility of changing the transverse size, which is , in order to increase the reliability of fixation of bone fragments, the enclosing element and supports are made of a material with a shape memory effect; the enclosing element is designed with clamps for the enclosed element coagulant, the supports are in the form of rings with legs for resting on the bone, extramedullary fixed on the ends with recesses, the recesses have the ability to change the transverse dimension, and the rings have a phase transition temperature greater than the rest of the device. phys