RU59964U1 - DEVICE FOR EXTRACTING A HOLLOW METAL NAIL FROM THE BONE - Google Patents

Abstract

The utility model relates to the field of medicine and medical technology, namely to devices designed to extract a hollow metal nail with an eye from the bone marrow cavity. The utility model is a round-shaped metal rod 1 18-24 cm long and 5-11 mm in diameter, freely introduced into the lumen of the channel of the extracted nail. In the upper part of the rod 1, grooves 2 are made, corresponding in position and shape to the eye of the extracted nail. For reliable fixation of the rod in the nail, a peg 3 having a through hole 4 is freely inserted into one of the grooves of the rod 4. The presence of the anvil 5 on the handle 6 helps to remove the device from the bone together with the nail. The utility model can be used in a trauma clinic when extracting a hollow metal nail with an eye from the bone marrow cavity.

Description

The utility model relates to the field of medicine and medical technology, namely to devices designed to extract a hollow metal nail with an eye from the bone marrow cavity.

The purpose of the utility model is atraumatic extraction from the bone marrow cavity of a long tubular bone of a hollow metal nail with an eye.

In the treatment of diaphyseal fractures of long tubular bones, in particular the thigh and lower leg, intraosseous osteosynthesis with various designs is used, including a hollow metal nail with an eye at the proximal end. The eye is designed to remove the nail from the bone marrow cavity after consolidation of the fracture. 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.

A device [1] is known for removing a long tubular bone from the bone marrow cavity of Kuncher’s nail. The device is a wire with a tip bent like a fishing hook, 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

a nail; its fragile retention on the end of the nail; hook fracture.

A device [2] is known, which is a vise forceps designed to remove massive hollow nails with an eye. The disadvantage of this device is not only its bulkiness, but also the need for a wide dissection of soft tissues to capture a nail. First of all, this concerns the subcutaneous fat in the region of the greater trochanter, over which the proximal part of the end of the nail stands for various lengths.

Known devices [3, 4], which are based on vibration. In this case, the capture of the pin is made in the form of pincers with a notch on the contact surface.

The objective of the utility model is atraumatic removal of a long tubular bone of a hollow metal nail with an eye that is safe for the patient from the bone marrow cavity.

The problem is solved by using a device that is, on the one hand, a round metal rod 1 with a length of 18-24 cm and a diameter of 5-11 mm, freely introduced into the lumen of the channel of the extracted nail. In the upper part of the rod 1 itself, a groove 2 is made, in the arrangement and shape corresponding to the ear of the extracted nail, into which the peg 3 having the through hole 4 is freely inserted. On the other hand, the presence of the anvil 5 on the handle 6 of the device facilitates its removal from the bone.

Figure 1 shows a general view of a utility model.

The utility model works (using the shin as an example) as follows. The anterior extra-articular site of tibial tuberosity is exposed and the end of the nail is located. Measurement of the internal

the diameter of the nail channel. Depending on the internal diameter of the nail, a rod 1 is inserted into its lumen, 1 mm less than the internal diameter of the nail. To reduce the invasiveness of the operation and secure the rod in the nail channel, a number of holes (grooves) are drilled in the rod 2. The groove 2 of the rod 1 is installed at the level of the ear of the extracted nail. In the groove 2 for reliable fastening of the rod 1 with the extracted nail is inserted a peg 3 having a through hole 4 in its upper part. After making sure that the rod 1 is securely fastened in the lumen of the nail canal, hammer striking the anvil 5 of the handle 6 removes the nail from the bone marrow cavity. By means of any hook inserted into the through hole 4 of the peg 3, the peg is removed from the groove 2 of the rod 1. After that, the rod 1 is freely released from the nail channel.

As a result of the application of the proposed utility model, it is relatively less traumatic to extract the nail located in the bone marrow cavity.

Information sources:

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

2. Nagibin L.M. Universal forceps-vise for removing the rods after intraosseous osteosynthesis // Orthopedics, traumatology and prosthetics, 1965. - No. 4. - S.76-77.

3. Suvalyan A.G., Galushkin Yu.A. A device for removing intraosseous pins // Orthopedics, traumatology and prosthetics, 1983. - No. 10. - S.66-68.

4. Suvalyan A.G., Galushkin Yu.A. Portable vibration device for removing intraosseous pins // Orthopedics, traumatology and prosthetics, 1983. - No. 11. - S. 55-56.

Claims (1)

A device for extracting a hollow metal nail with an eye from the bone marrow cavity, characterized in that a metal rod with grooves is inserted into the lumen of the nail channel, which is firmly fixed to the nail by inserting a peg into the ear and groove, the presence of an anvil on the device handle helps to remove it from the bone.