RU87345U1 - DEVICE FOR REPOSITION OF BONE FRAGMENTS - Google Patents

Abstract

1. A device for reposition of bone fragments, characterized in that it is made in the form of a rod with sections: a worker with a round hook with a possibility of grasping a bone on three sides at the distal end, fastening at the proximal end, on the external surface of which an external thread is applied, and intermediate between them in the form of a thrust pad, while both the outer and inner surfaces of the hook are made flattened with the possibility of a firm grip of the bone due to its laying on the inner surface of the hook, and the profile of the bend of the hook The ka is made with the center located away from the extended axis of the rod. ! 2. The device for reposition of bone fragments according to claim 1, characterized in that the portion of the rod from the thrust pad to the hook is made tapering towards the distal end.

Description

The utility model relates to the field of medical equipment and medicine, namely to traumatology and orthopedics, and can be used to reposition bone fragments in external fixation devices.

There are various modifications of the rods for transosseous osteosynthesis [copyright certificate SU No. 1667850, certificate RU No. 14826 for utility model], having a working, mounting and connecting parts.

The disadvantage of these rods is manifested in their use and consists in the need to drill a bone fragment to conduct the working part of the rod through it, which increases the invasiveness of the intervention.

Known hook rod described in patent RU No. 2068241 for the invention, the working end of which is curved in an arc of a circle.

However, the use of this hook rod is possible in the case when its tubular structure is preserved in the bone fragment, i.e. there is no defect in any of the cortical plates. The use of the hook rod is also impossible in the presence of main vessels and nerves in the projection of the introduction of the hook rod. The need to form a hole for the introduction of the hook rod increases the morbidity of the manipulation. The introduction of a hook into the bone with a bend of large 1/3 of the circumference is technically difficult, especially in places with a large volume of soft tissue.

The closest analogue to the claimed utility model is "Device for reposition and fixation of bone fragments" [RU patent for invention No. 2233640], containing a hook-like curved rod. The bend of the rod does not exceed 1/2 of the diameter of the bone, and its outer part has pointed teeth on a concave surface.

This device is intended primarily for the treatment of comminuted fractures of long bones. Using the described hook-shaped rod on flat bones - pubic bones of the pelvis, clavicle, etc. very problematic. The contact area of a flat bone, its girth by a hook-shaped rod, is possible from only one surface, which is not enough, for example, for fragments of the clavicle.

The objective of the claimed utility model is to provide a controlled reposition of bones and fragments with the possibility of their multi-plane movement with minimal invasiveness of the intervention.

The essence of the claimed utility model is characterized in that the device for reposition of bone fragments is made in the form of a rod with sections: a worker with a round hook with the possibility of grasping bones on three sides at the distal end, fastening on the proximal end, on the external surface of which an external thread is applied, and intermediate between them in the form of a thrust pad, while both the outer and inner surfaces of the hook are made flattened with the possibility of a firm grip of the bone due to its laying on the inner surface s hook, the hook bend profile is centered referred extended away from the axis of the rod.

In addition, in the device for reposition of bone fragments with the above characteristics, the section of the rod from the thrust pad to the hook is made tapering towards the distal end.

The technical result of the claimed utility model is to solve the problem by improving the manufacture of the working section of the rod. The combination of the features described in this application for performing a hook located on the distal end of the rod allows reposition of bones and fragments in various planes. This technique - in the form of performing both the outer and inner surfaces of the hook flattened, provides a firm grip of the bone due to its laying on the smooth inner surface of the hook. The profile of the bend of the hook, made with the center located away from the extended axis of the rod, additionally allows you to provide a stronger girth of the bone for further manipulations with minimal invasiveness of the intervention.

A device for reposition of bone fragments is illustrated using Fig., Which presents a General view of the inventive device. In FIG. positions 1-6 are indicated:

1 - rod;

2 - working area;

3 - mounting section;

4 - an intermediate section in the form of a thrust pad;

5 - smooth transitions;

6 - hook;

7 - flattened outer and inner surfaces of the hook;

8 - external thread;

9 - section of the rod from the thrust pad to the hook.

A device for reposition of bone fragments is a rod 1 with sections: worker 2 - at the distal end, fastening 3 - at the proximal end, intermediate 4 between them in the form of a thrust pad 4. On both sides of the thrust pad 4 on the body of the rod 1 there are smooth transitions 5 The length of the working 2 sections is not more than the length of the mounting 3 sections. Worker 2 section has a hook 6 round shape with the ability to grasp the bone on three sides. Both the external and internal surfaces of the hook 6 are made flattened 7 and providing the possibility of a firm grip of the bone due to its laying on the inner surface of the hook 6. The profile of the bend of the hook 6 is made with the center aligned towards the extended axis of the rod 1. On the outer surface of the mounting 3 sections the rod 1 has an external thread 8. The portion 9 of the rod 1 from the thrust pad 4 to the hook 6 is made tapering towards the distal end.

The operation of the device in the system of the external fixation apparatus. In case of damage, for example, to the clavicle, a device for reposition of bone fragments works as follows. After applying the basic supports to the damaged collarbone at a distance of about 2 cm from the fracture site, the skin moves in the cranial direction (up), a puncture is made to the bone fragment, the distal end of the rod 1 in the form of a hook 6 is brought to the periosteum, while the rod 1 touches the skin of the sternum , hook 6 moves along the bone beyond its edge. Raising the rod 1, the hook 6 is brought under the bone, covering it from the cranial side. The fixing 3 portion of the rod 1 is fixed to the external fixation apparatus in the reposition unit.

The inventive utility model is implemented in an experimental sample. The product is being prepared for practical testing in medical conditions at the Federal State Institution “SarNIITO Rosmedtehnologii”. Samples of different sizes were prepared for patients of different complexions - people tall, short, thin, overweight, as well as adults, adolescents and children.

Claims (2)

1. A device for reposition of bone fragments, characterized in that it is made in the form of a rod with sections: a worker with a round hook with a possibility of grasping a bone on three sides at the distal end, fastening at the proximal end, on the external surface of which an external thread is applied, and intermediate between them in the form of a thrust pad, while both the outer and inner surfaces of the hook are made flattened with the possibility of a firm grip of the bone due to its laying on the inner surface of the hook, and the profile of the bend of the hook The ka is made with the center located away from the extended axis of the rod. 2. The device for reposition of bone fragments according to claim 1, characterized in that the portion of the rod from the thrust pad to the hook is made tapering towards the distal end.