RU95497U1 - DEVICE FOR OSTEOSYNTHESIS - Google Patents

Abstract

The utility model is aimed at ensuring stable fixation of bone fragments when performing intramedullary osteosynthesis, which is achieved using a threaded rod 1 with a working end 2, the diameter of which is larger, and a threaded shank 3 - having a diameter smaller than the main part of the rod. Along the perimeter of the threaded rod, longitudinal grooves 7 and 8 are made with radial outputs 9 and 10 at the level of the working end and the tail third of its main part. In this case, with the possibility of movement, sleeves 4 and 5 are installed on the rod, a clamping nut 6 is mounted on the threaded shank, and flexible rods 11 and 12 are placed in the grooves, which are in contact with the specified clamping nut, 3 il.

Description

A useful model - a device for osteosynthesis - relates to medical equipment and can be used in the treatment of patients with fractures of a long, for example, femur.

Known needle for osteosynthesis, made in the form of a rod with sleeves mounted on it with the ability to move, provided with a longitudinal groove with a radius face at the working end for the output of a flexible rod held along the groove (AS USSR No. 1670836, chipboard).

However, this spoke is designed to fix individual bone fragments and does not provide the possibility of their connection with each other. In addition, to increase the rigidity of fixation and controllability of the position of the fragment, at least two spokes are required that are mounted on the external supports of the transosseous osteosynthesis apparatus.

Known bimetallic needle, made in the form of a rod equipped with sequentially arranged longitudinal grooves for flexible rods having a radius inlet and outlet (RF Patent No. 2211002, publ.: 08/27/03., Bull. No. 24).

The spoke is also intended for use in external fixation devices; it does not provide stable fixation of two adjacent fragments simultaneously; therefore, it cannot be used as an independent device for treating fractures of tubular bones.

The objective of the utility model is to develop a device that provides stable intramedullary fixation of bone fragments in the treatment of fractures of its diaphysis.

This problem is solved by the fact that in the device for osteosynthesis containing a rod made with longitudinal grooves having a radial outlet for flexible rods, and bushings mounted on the rod with the ability to move, the rod is made with a threaded thread of the main part, equipped with a threaded shank with mounted on it a clamping nut in contact with the ends of the flexible rods, and the longitudinal grooves are located around the perimeter of the rod, some of which have an outlet at the level of its working end, and others in the tail third of the other part.

It is also envisaged that:

- the diameter of the working end of the rod exceeds the diameter of its main part, the diameter of the latter is greater than the diameter of the threaded shank, and the depth of the longitudinal grooves is not less than the diameter of the flexible rods;

- the sleeves are equipped with an internal threaded thread corresponding to the threaded thread of the main part of the rod, and their diameter corresponds to the diameter of the working end of the rod.

The utility model is illustrated by the description and diagrams, which depict:

Figure 1 - device for osteosynthesis;

Figure 2 is the same, view along A;

Figure 3 is the same, view along B.

The device for osteosynthesis (Figure 1) contains a threaded thread of the main part of the rod 1 having a working end 2 and a threaded shank 3. The diameter of the working end of the rod exceeds the diameter of its main part, and the diameter of the latter is larger than the diameter of the threaded shank. Mounting sleeves 4 and 5 are mounted on the rod 1 with a possibility of movement, and a clamping nut 6 is mounted on the threaded shank 3. These sleeves are provided with an internal threaded thread with a step corresponding to the threaded thread of the rod 1, and their diameter corresponds to the outer diameter of the working end 2.

On the surface of the rod 1, along its perimeter, from the side of the threaded shank 3, longitudinal grooves 7 and 8 are made, having radial outlets 9 and 10 located, respectively, at the level of the working end 2 and in the tail third of its main part. In turn, in the longitudinal grooves 7 and 8, flexible rods 11 and 12 are placed, which at one end are in contact with the compression nut 6 installed on the threaded shank 3. Moreover, the depth of the longitudinal grooves 7 and 8 is not less than the diameter of the flexible rods 11 and 12.

A device for osteosynthesis is used as follows.

Immediately before using the device, sleeves 4 and 5 are installed on the rod 1 by threading at the bases of the radial exits of the longitudinal grooves 7 and 8. Through a soft tissue incision, the proximal articular end of the damaged bone is accessed, for example, to the upper surface of the greater trochanter of the femur, and a channel is formed from this surface to the medullary cavity of the femoral diaphysis. After reposition of the fragments, the working end 2 of the rod 1 is introduced into the formed channel and immersed through the fracture zone into the medullary cavity of the distal bone fragment, leaving the threaded shank 3 outside. After that, first, in the longitudinal grooves 7 of the rod 1 have radial outlets 9 at the level of the working end of the rod, flexible rods 11 are successively inserted and advance until they extend beyond the limits of the rod and stop the working ends in the walls of the medullary cavity of the distal bone fragment. Then, flexible rods 12 are likewise inserted into the longitudinal grooves 8, which, through the radial outlets 10, are also extended outside the rod to the end by the working ends in the walls of the medullary cavity of the proximal bone fragment. (Fig.2, 3) Following this, with the help of an electric drill, the working ends of the rods 11 and 12 are immersed in the compact substance of the walls of the medullary cavity. If necessary, the tail portion of the flexible rods 11 and 12 protruding from the grooves 7 and 8 is “bitten” by the required amount and the clamping nut 6 is screwed onto the threaded shank 3, bringing it into contact with the ends of these rods. By tightening the nut 6, the rods 11 and 12 are jammed and thereby stabilize the position of the fixed fragments. After performing control radiography, the wound is sutured in layers.

After bone consolidation, the device is dismantled in the reverse order.

Using the device in the clinic RSC "WTO" them. Acad. G.A. Ilizarova showed that its use provides stable intramedullary fixation of bone fragments in the treatment of patients with fractures of long bones.

Claims (3)

1. A device for hip osteosynthesis, comprising a rod made with longitudinal grooves having a radial outlet for flexible rods, and bushings mounted on the rod with the possibility of movement, characterized in that the rod is made with a threaded thread of the main part and equipped with a threaded shank with it installed a clamping nut in contact with the ends of the flexible rods, and the longitudinal grooves are located around the perimeter of the rod, some of them having an outlet at the level of its working end, and others in the tail third of the main part Asti. 2. The device according to claim 1, characterized in that the diameter of the working end of the rod exceeds the diameter of its main part, the diameter of the latter exceeds the diameter of the threaded shank, and the depth of the longitudinal grooves is not less than the diameter of the flexible rods. 3. The device according to claim 1, characterized in that the bushings are provided with an internal threaded thread corresponding to a threaded thread of the main part of the rod, and their diameter corresponds to the diameter of its working end.