RU59393U1 - BIT FOR ANGULAR OSTEOTOTOMIES OF PLUSE BONES - Google Patents

Abstract

The utility model relates to the field of medicine, namely to instruments used in orthopedics, and can be used for angular osteotomy of the metatarsal bones during reconstructive operations on the feet. The chisel consists of a handle and a working part. The working part is equipped with a channel and is made with an angular section at an angle of 70 degrees. The cutting edges of the working part from the recess from the inside are sharpened. Compared with the design of the prototype, the claimed design of the bit allows to increase the accuracy of the angular osteotomy of the metatarsal bones during reconstructive operations on the feet, as well as reduce the invasiveness of the operation.

Description

The utility model relates to the field of medicine, namely to instruments used in orthopedics, and can be used for angular osteotomy of the metatarsal bones during reconstructive operations on the feet.

To perform angular osteotomy of the metatarsal bones during reconstructive operations on the feet, direct bits or an oscillating saw are usually used (Egorov MF, Kunin K.V., Teterin OG Orthopedic cosmetology. Correction of the foot. - M.: RAMS Publishing House, 2003 . - 80 p.)

The use of an oscillating saw is associated with difficulties in choosing a specific osteotomy angle.

As a prototype for the closest technical nature, we have chosen the design of a direct bit. (Cherkess-Zade D.I., Kamenev Yu.F. Foot surgery. - M.: Medicine. - 1995. - 288 p.).

However, it is known from the authors' own practice that the use of a standard straight bit is traumatic and fraught with splitting of the cortical walls of the metatarsal bones, while the angle of the osteotomy is set by the surgeon arbitrarily and completely depends on his experience and, therefore, is difficult to control.

The objective of the utility model is to reduce the morbidity and increase the accuracy of performing angular osteotomy of the metatarsal bones during reconstructive operations on the feet.

The problem is solved in that the working part of the bit for angular osteotomy of the metatarsal bones during reconstructive operations on the feet is equipped with a channel and is made with an angular section of the working part at an angle of 70 degrees, and the cutting edges of the working part of the bit from the recess are sharpened.

Distinctive essential features of the claimed utility model are:

1. Supply of a bit by the channel.

The presence of the channel allows you to strictly follow the given plane of the osteotomy, which is carried out previously entered into the channel

2. The implementation of the bit with an angular cross section of the working part at an angle of 70 degrees.

A predetermined angle of 70 ° is optimal and allows an osteotomy to be performed within a predetermined angle.

thin knitting needle.

3. Sharpening on the cutting edges of the bit from the recess.

Sharpening the cutting edges from the inside of the recess eliminates the compression of the contact surface of the bone, because the proppant is directed inside the recess. Thus, in the narrow part of the osteotomy bone, the correct structure of bone beams and inter-beam spaces is maintained, and good blood supply is also provided, which favorably affects the processes of reparative regeneration of bone tissue.

The set of distinctive essential features is new and allows to increase the accuracy of performing angular osteotomy of the metatarsal bones during reconstructive operations on the feet, as well as reduce the invasiveness of the operation compared to the design of the prototype.

The essence of the utility model is illustrated by drawings, where figure 1 schematically shows the inventive bit, and figure 2 is a section along aa.

Handle - 1;

Working part - 2;

Cutting edges - 3;

Channel - 4.

The device operates as follows:

In the subcapital part of the 1st metatarsal bone, the center is marked with a thin awl, after which a thin spoke is drawn through it according to the desired osteotomy plane. The end of the spoke is bitten off, leaving 5-6 cm. The cannulated part of the proposed bit is inserted into this spoke and an osteotomy is performed by means of hammer blows.

The chisel is made of stainless steel grades:

12 × 18 N 10 T GOST 5632-72 and 40 × 13 GOST 5632-72

Hardness of working surfaces: 52-55 N RC e

The use of the proposed angled cannulated bit showed its high efficiency when performing reconstructive operations for transverse flatfoot in 12 patients. Compared with the design of the prototype, the claimed design of the bit allows to increase the accuracy of the angular osteotomy of the metatarsal bones during reconstructive operations on the feet, as well as reduce the invasiveness of the operation.

Claims (1)

Bit for angular osteotomy of the metatarsal bones, consisting of a handle and a working part, characterized in that the working part is provided with a channel and is made with an angular section at an angle of 70 °, and the cutting edges of the working part from the recess from the inside are sharpened.