RU157823U1 - DEVICE FOR INCREASING THE DENSITY OF BONE MASS OF THE JOINT OF THE SHOULDER PROCESS - Google Patents

Abstract

1. Device for increasing the density of the bone mass of the articular process of the scapula, characterized in that it consists of external and internal parts, made in the form of rounded saucer-shaped bodies curved in an arc with the possibility of laying the convex surface of the inner part on the concave surface of the outer part until they fit snugly friend, while the outer part has a thickness of the order of 10-20 mm and through holes spaced apart over its entire area for placement of grafts in them, from the convex surface of the inner part and protrusions are made corresponding to the number, size and location of the parameters of the through holes; from the side of the concave surface of the outer part, in its central zone there is a guide element according to the type of rod, and in the central zone of the inner part there is a reciprocal through hole to ensure its movement along the guide element and to introduce protrusions of the inner part into the corresponding through holes of the outer part. 2. The device according to claim 1, characterized in that the through holes of the outer part are made round with a diameter of 3-10 mm. The device according to claim 1, characterized in that the through holes of the outer part have a triangular shape, the sides of which are about 3-10 mm. The device according to claim 1, characterized in that the guide element has a multifaceted shape.

Description

The utility model relates to medical equipment used in traumatology and orthopedics, and is intended to increase the density of the bone mass of the articular process of the scapula when performing endoprosthetics or plasty in patients with osteoporosis.

The specificity of injuries of the shoulder joint and their prevalence is a consequence of the distinctive features of its anatomy, consisting in a large volume of active movements, which is achieved by articulating a large area of the cartilaginous surface of the shoulder head and the relatively small surface of the glenoid cavity of the shoulder blade, i.e. the outer surface of her articular process. There are many diseases that are accompanied by dysfunction of the shoulder joint and require surgical intervention aimed at plastic surgery of the defect of the articular process of the scapula with the fixation of implants with screws and screws or endoprosthetics of the shoulder joint as a whole with the installation of the component of the articular cavity of the scapula, fixing it in the articular process of the scapula.

Pathological changes in the shoulder joints, in most cases, are accompanied or are the cause of the development of osteoporosis in the periarticular region with significant loss of bone mass. The situation is also aggravated by the fact that the process of stress remodeling of bone tissue that occurs around the implant, screw, screw, component of the endoprosthesis after their implantation, in conditions of osteoporosis, is accompanied by significant additional bone loss according to densitometry. Excessive loss of bone mass leads to the development of instability of fixation of these structures and the need for repeated surgical intervention [Nazarov A.E. Clinical and experimental rationale for the use of the implant “Sphen C” for hip joint replacement in patients with osteoporosis: abstract of thesis. dis ... cand. honey. sciences. - Moscow, 2005. - 18 s]. In conditions of osteoporosis, in order to eliminate the loss of stability of fixation of the above structures, they constantly improve the design of these devices, their fasteners [RU patents for utility models No. 147703, 147704, RU patent for invention No. 2220682], as well as in the pre- and postoperative periods carry out drug treatment of osteoporosis.

Using the example of a hip joint to solve a similar problem, there is a technique [RU patent for invention No. 2396918], which is also used in practice on the shoulder joint. It is aimed at increasing the density of bone mass around the implant in order to increase the reliability and stability of fixation of the components of the endoprosthesis and strengthen the most loaded surfaces of the acetabulum. This technique includes the implantation of autografts made from a resected femoral neck of a cone-shaped or wedge-shaped shape, with a narrowed end into the acetabulum roof and its posterior wall in the direction perpendicular to its surface, until they are completely immersed. However, there are no special devices for pressing autografts into the articular surface; earlier this manipulation was carried out by any improvised means, for example, extensions to the endoprosthesis, which complicated the implantation process and reduced the quality of its implementation. In the literature there is information about the “Device for bone transplantation” [SU copyright certificate No. 957881] designed to collect the autograft in the form of a column and transfer it to the implantation site. It contains a housing, a milling cutter connected to it, and a rod mounted in the housing. The body is made in the form of a tube with a conical channel and is equipped with a shank for the drill. The rod is equipped with a piston with holes installed in the conical channel of the tube, and the cutter is removable.

Due to the fact that at present we have not found information about the presence of devices similar to those claimed by the technical level, even for use in hip joint replacement, the device described in the copyright certificate can be considered the closest, at least from the point of view of application specificity SU on the invention No. 957881.

The objective of the claimed utility model is to develop a device to increase the bone density of the articular process of the scapula when performing endoprosthetics or plasty in patients with osteoporosis, which simplifies the process of implantation of grafts into the articular process of the scapula.

The essence of the claimed utility model is characterized in that the device for increasing the density of the bone mass of the articular process of the scapula consists of two separate parts - external and internal, made in the form of rounded saucer-shaped bodies curved in an arc with the possibility of laying the convex surface of the inner part on the concave surface of the outer part to a dense adjacent to each other, while the outer part has a thickness of the order of 10-20 mm and through holes spaced throughout its area for placement of grafts in them, with Torons convex surface inside of the protrusions corresponding in number, size and location parameters of the through holes; on the side of the concave surface of the outer part, in its central zone there is a guide element according to the type of rod, and in the central zone of the inner part there is a reciprocal through hole to ensure its movement along the guide element and introducing protrusions of the inner part into the corresponding through holes of the outer part.

A device with the above-described features is also claimed in which the through holes of the outer part can be made round with a diameter of 3-10 mm or have a triangular shape, the sides of which are of the order of 3-10 mm.

In addition, also claimed is a device with the above features, in which the guide element has a multifaceted shape.

The technical result of the claimed utility model.

Design features of the device allow implants to be implanted into the articular process of the scapula by simultaneously pressing them in a predetermined location, eliminating the need to form additional recesses under the grafts by performing only one manipulation, namely laying the convex surface of the inner part on the concave surface of the outer part until it fits snugly ensuring that the protrusions enter the through holes. All of the above can significantly simplify the technique of implantation and reduce the time required for its implementation.

The presence of a guiding element of a multifaceted shape in the central zone of the outer part and the through hole corresponding to it facilitates the process of getting the protrusions into the corresponding through holes.

The inventive utility model is illustrated using Fig., Which shows a General view of the device. In FIG. positions 1-8 are indicated:

1 - external part;

2 - inner part;

3 - convex surface of the inner part;

4 - concave surface of the outer part;

5 - through holes for placement of grafts in them;

6 - protrusions;

7 - a directing element;

8 - mating through hole for the guide element.

A device for increasing the density of the bone mass of the articular process of the scapula consists of two separate parts - external 1 and internal 2. The latter are made in the form of rounded saucer-shaped bodies curved in an arc with the possibility of laying the convex surface 3 of the inner part 2 on the concave surface 4 of the outer part 1 until it fits snugly to each other. The outer part 1 has a thickness of the order of 10-20 mm and through holes 5 spaced over its entire area to accommodate the grafts. The through holes 5 of the outer part 1 can be made round with a diameter of 3-10 mm or have a triangular shape, the sides of which are about 3-10 mm. On the side of the convex surface 3 of the inner part 2, protrusions 6 are made, corresponding in number, size, shape and arrangement to the parameters of the through holes 5. On the side of the concave surface 4 of the outer part 1, there is a guiding element 7 in its central zone like a rod, and in the central zone the inner part of the reciprocal through hole 8 with ensuring its movement along the guide element 7 and the introduction of the protrusions 6 of the inner part 2 into the corresponding through holes 5 of the outer part 1. The guide element 7 has many gogrannuyu shape with at least three sides.

A device for increasing the density of the bone mass of the articular process of the scapula is used as follows.

During surgery aimed at plastic surgery of the articular process of the scapula or arthroplasty of the shoulder joint, after processing the outer surface of the articular cavity of the scapula, grafts are implanted into the articular process of the scapula in order to increase bone mass and strengthen bone structures. For this, the through holes of the outer part are filled with transplants. In this case, autografts, formed, for example, from the previously resected proximal femur, allografts, or synthetic and composite grafts, as well as their combination, can be used. Transplants can be installed in through holes both intraoperatively and before surgery in sterile conditions, in industrial production, after sterilization treatment. Install the outer part into the articular cavity of the scapula. The inner part is moved along the guide element to ensure that the convex surface of the inner part is laid on the concave surface of the outer part by using pressure until it fits snugly to ensure that the protrusions enter the through holes, pressing the grafts into the articular process of the scapula, increasing bone density. To ensure a snug fit of the convex surface of the inner part to the concave surface of the outer part, a surgical tool is used like a hammer with an extension. The device is removed. Complete the main stage of the surgical intervention.

In the postoperative period, patients are prescribed drugs for the treatment of osteoporosis according to the generally accepted methodology.

Example.

In the city of Saratov, several prototypes of products of various types of sizes were made with through round holes equidistant from each other

and similar sizes with through-holes of triangular shape equidistant from each other, the sides of which were 3 mm, 5 mm and 7 mm, respectively.

Tests of devices on the models of the shoulder joint, reproducible anatomy and architectonics of the bone apparatus in patients with osteoporosis, which proved the validity of the application of the totality of the claimed design features, were conducted.

Claims (4)

1. Device for increasing the density of the bone mass of the articular process of the scapula, characterized in that it consists of external and internal parts, made in the form of rounded saucer-shaped bodies curved in an arc with the possibility of laying the convex surface of the inner part on the concave surface of the outer part until they fit snugly friend, while the outer part has a thickness of the order of 10-20 mm and through holes spaced apart over its entire area for placement of grafts in them, from the convex surface of the inner part and protrusions are made corresponding to the number, size and location of the parameters of the through holes; on the side of the concave surface of the outer part, in its central zone there is a guide element according to the type of rod, and in the central zone of the inner part there is a reciprocal through hole to ensure its movement along the guide element and introducing the protrusions of the inner part into the corresponding through holes of the outer part. 2. The device according to p. 1, characterized in that the through holes of the outer part are made round with a diameter of 3-10 mm 3. The device according to claim 1, characterized in that the through holes of the outer part have a triangular shape, the sides of which are about 3-10 mm. 4. The device according to claim 1, characterized in that the guide element has a multifaceted shape.

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