RU58902U1 - DEVICE FOR EXTRACTING FROM BONE-CRAIN CAVITY OF A BROKEN HOLLOW METAL NAIL - Google Patents

Abstract

The utility model relates to the field of medicine and medical technology, in particular to devices designed to extract from a bone marrow cavity a hollow metal rod broken in it.

The utility model is a round metal rod 1 with a length of 48-54 cm and a diameter of 5 mm. The rod introduced into the nail channel at a distance of 5 cm from the end part is divided in the form of the letter V into two equally sized, shape-memory, semicircles 2, the outer surfaces of which end with hooks 3 of 2 mm each. The proximal portion of the rod 1 is represented by the anvil 4 at the handle 5.

The utility model can be used in a trauma clinic, during the operation of extracting a hollow metal nail broken in the bone marrow cavity.

Description

The utility model relates to the field of medicine and medical technology, in particular to devices designed to extract from a bone marrow cavity a hollow metal nail broken in it.

The purpose of the utility model is atraumatic extraction of a long tubular bone from a bone marrow cavity of a hollow metal nail broken in it.

In the surgical treatment of diaphyseal fractures of long tubular bones, in particular the lower leg, intraosseous osteosynthesis with a metal nail is used. For stable fixation of the fracture, a hollow metal nail made in the form of a clover leaf corresponding to the length and diameter of the narrow part of the bone marrow cavity, in particular, Kuncher, is used. After consolidation of the fracture, the metal nail located in the medullary cavity should be removed, for which a number of technical devices have been proposed. Doctors experience special difficulties with nail removal during its “fatigue” fracture inside the bone marrow cavity. At the same time, removing a proximal fragment of a metal nail does not present special difficulties, while it can be very difficult to extract the rest of the nail from the bone marrow cavity.

A device [1] is known for "closed" removal from the bone marrow cavity of a long tubular bone of a Kuncher nail. The device is a wire with a bend, like

fishing hook, with the end capturing the end part of the nail, ensuring its removal. The disadvantages of this device are: frequent extension of the hook that occurs at the time of extraction of the nail; its fragile retention on the end of the nail; hook fracture.

It is also known a device [2], designed for "closed" removal of a Kuncher nail, made of a rod 50 cm long and 5 mm in diameter, one end of which ends with a hook 25 mm long, and the other with a handle. The device is inserted through the nail channel until it is immersed in the spongy part of the distal part of the bone, i.e. for the end of the nail. As a result, the protrusion of the hook of the device is hooked to the end edge of the distal fragment of the nail, while removing the tool from the bone leads to the extraction and fragment of the nail.

With undoubted feasibility, these devices have a number of significant drawbacks: hook extension that occurs at the time of extraction of the nail; hook fracture at the end of the nail; insufficient hook retention on the end of the nail.

The objective of the utility model is atraumatic removal of a long tubular bone, for example, of the tibia, of a hollow metal nail broken in it, that is safe for the patient.

The problem is solved by using a device that is a round metal rod 1 with a length of 48-54 cm and a diameter of 5 mm. In this case, the rod introduced into the nail channel at a distance of 5 cm from the end part is divided into two equal-sized semicircles 2 in the form of the letter V, having shape memory, the outer surfaces of which end with hooks 3 of 2 mm each.

Proximal, i.e. located outside the bone, the rod 1 is represented by the anvil 4 at the handle 5.

In fig. 1 shows a general view of a utility model.

The utility model works (using the shin as an example) as follows. Through the anterior extra-articular site of tibial tuberosity, a metal rod 1 is inserted under electron-optical control into the lumen of the bone marrow cavity of the tibia and breaks through the channel of the remaining part of the hollow broken metal nail. The moment when the hooks 3 of the metal rod 1 reaches the distal part of the end of the nail is controlled on the screen of the electron-optical converter. Memory forms of the semicircle 2 diverge to the sides, with hooks 3 they hook onto almost the entire end surface of the distal part of the broken nail and are fixed on it. After making sure that the hooks 3 are securely attached to the end of the nail, hammer blows on the anvil 4 at the handle 5 remove it from the bone marrow cavity.

As a result of the application of the proposed utility model, it is possible to extract a fragment of the nail located in it from the bone marrow cavity with relatively little trauma.

Information sources:

1. Kuntscher, G. Die Marknagelung. - Berlin, 1950.

2. Baskevich M.Ya., Burtseva Yu.P. A tool for removing a broken hollow nail // Collection of rationalization proposals for traumatology and orthopedics. - Tyumen, 1990. - S.179-180.

3. Muller M.E. et. al. Technigue of internal fixation of fractures // New York, 1965.

Claims (1)

A device for extracting a broken hollow metal nail from the medullary cavity, characterized in that the end part of the nail inserted into the lumen of the nail channel is divided into two, made in the form of the letter V, equal in size to the semicircle, having a shape memory, the outer surfaces of which end with hooks, providing a grip and holding the end of the broken nail, the presence of an anvil on the handle of the proximal part of the device contributes to its removal.