RU30558U1 - OSTEOSYNTHESIS LOCK - Google Patents

Description

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OSTEOSYNTHESIS LOCK

The utility model relates to the field of mediation, in particular to the medical technique used in osteosynthesis for transosseous fixation of various bone structures of the vertebrae and epiphyses of long tubular bones.

A device for compression osteosynthesis is known, which contains two legs and a curved working part in the form of a combination of wire arched elements and is made of a material with a memory effect (Patent 2108762, Russian Federation. Publish. 04/20/1998).

Known screw for osteosynthesis, made in the form of a threaded rod with a head having a support and mounting parts connected by a neck, while the supporting part of the head is attached to a threaded rod, in which the neck is made in the form of a truncated cone, the larger base of which is joined to the surface of the supporting part of the head (A.S. 1804317, USSR. IPC A6Sh17 / 58. Publ. 23.03.93. Bull. 11).

A device for osteosynthesis is known, characterized by a device for attaching to bone fragments mounted on a spatial fixation device, in which each device is made in the form of a screw with a tubular body, on the side with an external thread of which there is at least a pair of longitudinal end protrusions with the possibility of sliding . (Application 2001 103534, RF. Published. 07.27.2001).

A known fixator of bone fragments containing a rod, at one end of which a thread is cut and made of metal with shape memory, one of its ends is threaded and has a conical shape (Certificate No. 24365, RF. Publish. 08/10/2002).

However, the known fixator of bone fragments is designed to fix mainly tubular bones and its design does not allow the fixation of spongy bones in the mode of self-jamming.

The objective of the utility model is the development of a fixative for osteosynthesis, the design of which allows prolonged self-fixation and the prevention of necrotic processes.

The problem is solved in that the fixator for osteosynthesis, contains a rod made of metal with shape memory, equipped with an external thread and at one end with a conical sharpening, in which the external thread is made throughout

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its length, and a head is made at the second end of the rod, while from the side of the conical sharpening, the rod is longitudinally dissected into three parts to its base, in addition, the base of the conical sharpening is fixed on one of the dissected parts of the rod. It is advisable for uniform gentle effect on the fixed bone structure, the angle of dissection of the core of the fixer to perform equal to 120 °, and the length of the dissection equal to 2/3 of its length.

The latch is illustrated with a detailed description and diagrams in which:

FIG. 1 - illustrates the design of a latch made of metal with shape memory;

FIG. 2 - depicts the dissected end of the latch in a bent position, the same as in FIG. 1;

FIG. 3 - depicts a perspective view of a fixative for osteosynthesis;

FIG. 4 - depicts a view - And from the side of the conical sharpening of the rod.

The retainer of bone fragments is completely 1 in the form of a rod 1 (Fig. 1), equipped with an external thread. The end 2 of the rod 1 has a conical sharpening, from the side of which it is dissected into three parts. In this case, a dissection of 3, 4, 5 (Fig. 2) is performed to the base 6 of the conical sharpening. The dissection length is 2/3 of the length of the rod 1. At the second end of the rod 1 (Fig. 3) a head 7 is made. The head 7 has a hexagonal shape.

The cutting angle of each of the three parts 3, 4, 5 of the end 2 of the rod 1 is completed at 120 ° (Fig. 4).

During the operation, the fixative for osteosynthesis (hereinafter fixative) is cooled with chloroethyl, while it takes its original shape (Fig. 1). Then it is introduced into the spongy bone structure. When the fixation rod 1 is heated, its dissected part tends to take a given shape (Fig. 2), and over time, the spaces formed as a result of bone resorption are filled. This provides reliable fixation during the required treatment period. To remove the latch, it is necessary to cool the head 7 and the outer part of the rod 1 with chloroethyl, while the rod takes its original shape (Figure 1) and is removed as a regular rod.

The proposed bone fixer allows you to ensure strong fixation of bone structures for the time necessary for treatment, as well as to reduce the time of rehabilitation, in the process of treatment to prevent its loosening due to changes in its shape. Attaching a solid conical sharpening to one of the dissected parts of the rod ensures the optimization of the introduction of a longitudinally dissected rod into the bone structures, prevents particles of bone and other tissues from falling into the gaps between the parts of the rod and the occurrence of their necrotic changes.

Claims (2)

1. The clamp for osteosynthesis, containing a rod made of metal with shape memory, equipped with an external thread and at one end conical sharpening, characterized in that the external thread is made along its entire length, and a head is made on the second end of the rod, while side of the conical sharpening, the rod is longitudinally dissected into three parts to its base, in addition, the base of the conical sharpening is fixed on one of the dissected parts of the rod. 2. The latch according to claim 1, characterized in that the cut angle of the latch rod is 120 °, and the cut length is 2/3 of its length.