SU1061807A1 - Apparatus for perosseous osteosynthesis - Google Patents

Abstract

A device for interfacial osteosynthesis, containing a rod with a head and a threaded shank and a spring, characterized in that, in order to prevent a fall in constant dynamic compression, the spring is mounted on the rod, at one end fixed to the threaded shank, and at the other end has a stop pad. 3 X) D VI

Description

The invention relates to medical equipment ’, and in particular to devices for transosseous osteosynthesis.

Known is a device for transosseous osteosynthesis made in the form of a screw-screw [1].

However, the compression achieved with the screw is temporary and requires gypsum immobilization.

A device for transosseous osteosynthesis is also known, comprising a rod with a head and a threaded shank and a spring β2].

The disadvantage of this device is the lack of rigidity and, therefore, · loss of constant compression,

The aim of the invention is to eliminate the fall of constant dynamic compression.

This goal * is achieved by the fact that in the device for transosseous osteosynthesis containing a rod with a head and a threaded shank and a spring, the spring is mounted on the rod, fixed at one end. a threaded shank, and at the other end has a thrust pad.

Figure 1 shows a device for transosseous osteosynthesis; on fig.2 - the same in action.

The device comprises a rod 1 with a head 2 for a screwdriver and a spring. 3. In the rear part, the rod 1 is made with a threaded shank 4, on the threaded part of which a circular flat is made 5. The spring 3 at the ends has an anti-stop ring 6 and a thrust pad 7. In this case, the hole in the thrust pad 7 is made slightly larger than the diameter of the rod 1, and the hole in the anti-stop ring-6 is slightly smaller than the diameter of the rod 1. Thus, the anti-stop ring 6 placed in the circular flat 5 can freely rotate and at the same time create the necessary anti-stop when the spring 3 is stretched.

The device operates as follows.

For example, in oblique spiral fractures of tubular bones after surgical exposure of fragments 8 and 9 and their matching with an electric drill using a drill whose diameter is • 1 mm thinner than the diameter of the threaded shank 4 of rod 1, a channel is drilled in the direction perpendicular to the plane of the fracture. Then the hole in the nearest cortical layer is drilled with a drill of a larger diameter. Rod 1 is inserted into the drilled channel and screwed into the hole on the opposite cortical layer with a screwdriver. In this case, the thrust pad 7, fixed at the entrance to the hole in the nearest cortical layer, provides thrust and tension of the spring 3. The head 2 of the rod 1 should be immersed in the cavity of the thrust pad 7 when screwed (Fig. 2), the stretched spring 3 provides constant dynamic compression bone fragments 8 and 9 for the entire postoperative period.

Thus, the proposed design of the compression device will provide continuously-stressed osteosynthesis, excluding gypsum immobilization, which together will create favorable conditions for primary bone wound fusion and early functional treatment.

VNIIIPI Order 1009 3/5

Circulation 713 Subscribed

Branch of PPP Patent,

Uzhhorod, street, Project, 4

Claims (1)

DEVICE FOR TRANSSTANCE · GO OSTEOSYNTHESIS, comprising a rod with a head and a threaded shank and a spring, characterized in that, in order to prevent the constant dynamic compression from falling, the spring is mounted on the rod, fixed at one end to the threaded shank, and has a thrust pad at the other end.