SU1255122A1 - Endoprosthesis for hip joint - Google Patents

Description

The invention relates to medical technology, namely to hip joint endoprostheses, and can be used to replace the proximal end of the femur.

The purpose of the invention is to reduce the time of endoprosthesis and reduce the morbidity of bone tissue by making a reinforcing element in the form of a forked rod, one end of which is directed along the leg and extends to the surface of the neck, and the other end is directed along the neck, and the free end of the leg is split.

FIG. 1 shows the hip joint endoprosthesis, general view; in fig. 2 - the same, side view.

The endoprosthesis consists of a metal leg and a plastic part 2, the plastic part forms the head 3, the neck 4 and the spitting part of the endoprosthesis. The upper section of the metal leg 1 (which reinforces the plastic part of the endoprotein) is bifurcated. Its one end 5 is bent with respect to the main axis of the endoprosthesis and passes along the axis of the nut 4, and the other end 6 reaches the top of the spit: parts. The free end 7 of the legs 1 of the endoprosthesis is made split and consists of four rods with a diameter of 4 mm, which are 2-6 mm apart. This design of the leg of the endoprosthesis allows it to be inserted into the bone marrow space of the femur without any treatment of the latter, which significantly reduces the duration and invasiveness of the operation, as well as simplifies its technique. In addition, this design makes the proposed endoprosthesis acceptable for all possible sizes of the bone marrow space of an adult (its narrowest part varies from 8 to 16 mm). The metal pad projecting at the top of the vertical part greatly facilitates the installation of the endoprosthesis and

prevents the development of such formidable complications, such as the breaking of the greater trochanter and the splitting of the plastic part of the endoprosthesis.

The endoprosthesis replacement method is as follows.

On the eve of the operation, the size and shape of the bone marrow space are determined from the patient's radiographs.

femur Accordingly, with the obtained parameters, the size of the cervix and the pinnacle G of the endoprosthesis is changed with the help of cutters and a file. This procedure is easy to do, so

As indicated part of the construction is made of a material that by its mechanical qualities is close to the bone tissue. The cores of the split end of the endoprosthesis leg are bent from each other in such a way that the distance between them is double the diameter of the corresponding part of the bone marrow space of the patient's bone.

During surgery, after resection and removal of the cervix and femoral head of the patient, the bone marrow space is exposed. Rod ends

In her split end, the legs of the endoprosthesis are brought together into the bone marrow space without any treatment of the latter. At the last stage of insertion, the legs strike the metal top 8. In this case, the direction of the blows corresponds to the direction of insertion of the endoprosthesis. With the introduction of the rod of the split end of the leg consumption t-

c, occupy a position corresponding to the directions of the lines of force of the femur and tightly adjoin the walls of the bone marrow space, exerting elastic pressure on

its cortical part, which excludes the development of such a terrible complication, as the loosening of the endoprosthesis. By virtue of their elasticity, the rods repeat

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all individual anatomical features of the shape of the bone marrow space of the femur of the patient.

Yostavitel A. Mikhaltsov Editor S.Patrusheva, Tekhred L. Serdyukova Proofreader L. Patay

Order 4737/3 Circulation 660 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk chab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

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FIG. 2

Claims (1)

HIP Joint Endoprosthesis, including a leg with a reinforcing element at the end and a plastic neck with a head, characterized in that, in order to reduce the time of endoprosthetics and reduce bone trauma, the reinforcing element is made in the form of a diluted rod, one end of which is directed along the leg and comes to the surface of the neck, and the other end is directed along the neck, while the free end of the leg is made raskegglenny. fi s t