RU186732U1 - OSTEO-INTEGRATED LIMB PROSTHESIS - Google Patents

Abstract

The utility model relates to the field of surgical orthopedics, namely to implantable prostheses, and can be applied on the supporting limbs of animals. The technical result is to enable the prosthesis to be loaded immediately after the operation (restoration of the support function of the damaged limb), which is achieved due to the fact that the osteointegrated prosthesis made in the form of a cylindrical part with a perforated flange in the middle part, characterized in that transverse wells are made on the introductory part znye hole with internal thread at the end of the tail section, a groove which is oriented along the introductory part.

Description

The utility model relates to the field of surgical orthopedics, namely to implantable prostheses and can be used on the supporting limbs of animals. [A61F 2/28]

In the prior art, the INTRACOSTIC PIN [RU 2604390, publ. December 10, 2016], comprising a supporting nickel-titanium rod and a shell surrounding it of permeable-porous titanium nickelide chemically bonded to the rod, characterized in that the supporting rod is made of nickel-titanium threads assembled into a bundle with a diameter of 0.9 -1.1 with the average wall thickness of a single pore.

The disadvantage of the analogue is the impossibility of loading the intraosseous pin immediately after the operation and before the restoration of bone tissue around the pin, as well as a sufficiently long healing time of the epithelium around the pin.

Also known from the prior art FASTENING DEVICE AND PROSTHESIS INCLUDING THIS DEVICE [RU 2189200, publ. September 20, 2002], comprising a fastener having an end surface located on the input side and a cylindrical peripheral surface that is provided with a screw thread and at the front self-cutting end of which adjacent to the specified end surface there are circumferentially spaced cutting recesses extending in the axial direction to this end surface, characterized in that in the rear non-self-tapping part of the threaded peripheral surface there are grooves spaced around the circumference for collection and distribution tissues that extend radially outward, which extend at least partially in the longitudinal direction of the fastener, and each of which is attached with its front end to one of the cutting recesses for collecting cut bone material from this recess and its direction from the grooves in the radial direction for distribution along circles around the inner wall of the cavity with the introduction of the mounting device.

The disadvantage of this analogue is the impossibility of loading the prosthesis after surgery and before the restoration of bone tissue around it and is limited in scope.

The closest in technical essence is a percutaneous prosthesis [RU 2288673, publ. December 10, 2006], made in the form of a cylindrical part, in the middle part of which a perforated flange is installed, while part of the prosthesis on the input side is pointed and longitudinal incisal grooves are located on its surface, and the other part of the prosthesis is cylindrical.

The main technical problem of the prototype is a long recovery period after surgery, in which it is impossible to load the prosthesis, due to the fact that before restoration of the bone tissue around the opening of the prosthesis and in case of giving an axial and / or transverse moment to the prosthesis, it may subsequently fall out or deviate from the initial set provisions.

The objective of the utility model is to eliminate the disadvantages of the prototype.

The technical result is to ensure that the prosthesis can be loaded immediately after the operation (restoration of the support function of the damaged limb).

The specified technical result is achieved due to the fact that the osteointegrable prosthesis made in the form of a cylindrical part with a perforated flange in the middle part, characterized in that transverse through holes with internal thread are made on the inlet part, a groove is made at the end of the tail part, which is oriented along the inlet parts.

In particular, a rounded chamfer is made on the flange from the tail end.

In particular, an external thread is made on the opening of the prosthesis.

In particular, the prosthesis is made of a titanium alloy Ti-6Al − 4V.

In particular, the prosthesis was made by 3D printing, selective laser smelting from a titanium alloy Ti-6Al − 4V.

A brief description of the drawings.

Figure 1 presents a sectional front view of an osteointegrated prosthesis.

Figure 2 presents a side view of an osteointegrated prosthesis.

Figure 3 presents a section of the bracket for installing conductors.

Figure 4 presents a section of the conductor.

Figure 5 presents a section of the prosthesis assembly with accessories for its installation.

Figure 6 shows a section of a limb with an installed prosthesis and accessories for its installation.

Figure 7 shows an example of an installed titanium prosthesis (x-ray and photo of the prosthesis on the limbs of the animal).

On Fig shows an example of an installed titanium prosthesis with an exoprosthesis fixed to it (x-ray and photo of the prosthesis on the limbs of the animal).

The figures indicate: 1 - flange with chamfer, 2 - perforation in the flange, 3 - the tail of the prosthesis, 4 - the end groove, 5 - the introduction of the prosthesis, 6 - external thread, 7 - transverse through holes with internal thread, 8 - G -shaped bracket, 9 - bracket spike, 10 - through holes with internal thread in the bracket, 11 - conductors with through guide holes 12, 13 - bone, 14 - intramedullary bone channel, 15 - holes in the bone, 16 - bolts for fixing the prosthesis in the intermedular canal of the bone, 17 - tissue.

Implementation of a utility model.

The osteointegrable prosthesis is made in the form of an integral cylindrical part and contains a flange 1 with perforation 2 and a chamfer from the side of the tail part 3, at the end of which a groove is made 4. At the inlet part 5, an external thread 6 and transverse through holes with an internal thread 7 are made, with a groove 4 oriented in the same direction as the introductory part 5.

The prosthesis can be made of titanium alloy Ti-6Al − 4V.

To install the prosthesis, accessories are used that include an L-shaped bracket 8, on the inside of one part of which there is a spike 9 corresponding to the end groove 4, through holes with an internal thread 10 for conductors 11 with through holes 12 are made on the other part of the bracket 8, and bolts 16 for fixing the prosthesis in the intermedicular channel 14 of the bone 15.

The prosthesis and accessories are made in such a way that the holes 7 in the prosthesis are aligned with the holes 10 in the bracket and the holes 12 in the conductors 11.

The tail part of the prosthesis 5 is designed to install an external exoprosthesis of the supporting limb.

The dimensions of the prosthesis and accessories are selected based on computed tomography of the damaged limb in the preoperative period.

The main difference from analogues is the presence of through holes in the intramedullary leg of the prosthesis, in connection with which the rotation (antirotational function) of the leg inside the bone is prevented, thereby achieving greater rigidity of attachment. Also, to improve osseointegration of the implant with the bone (for better adhesion), methods for modifying (changing) the microrelief of implant surfaces using sandblasting (abrasive) processing and segmental processing of a titanium implant by microarc oxidation with the formation of a calcium phosphate coating on the surface are used.

The prosthesis can be made by 3D printing, selective laser melting (SLM - “Selective laser melting”) from a titanium alloy Ti-6Al − 4V.

During the operation of percutaneous osseointegration prosthetics, the claimed osseointegration prosthesis is implanted into the stump bone of an animal limb after amputation.

After amputation of the paws in animals due to trauma or cancer, the claimed prosthesis allows the limb to be fully supported.

Initially, operative access to the site of the amputated limb of the animal is performed. Then, the intramedullary canal 14 of the bone 13 is drilled into the length and diameter required to install the prologue 5 into it.

The prosthesis is installed in a dense to the amputated segment of the bone, then the intraosseous component of the prosthesis is screwed into the bone through the extraosseous part of the prosthesis.

Then, using a guide screwed into the threaded hole of the outer part of the prosthesis, drill a screw hole, for example, with a diameter of 3.0 mm. Then perform a sequential introduction of screws of slightly larger diameter, for example, with a diameter of 3.5 mm At the end of the operation, the surgical wound is closed.

It happens like this. Insert the tip of a screwdriver into the end groove 4 of the tail part 3 and screw the insertion part 5 into the intramedullary canal 14 of the bone 13 until it stops flange 1 against the end part of the bone 13. Next, the L-shaped bracket 8 is installed on the prosthesis by inserting a spike 9 into the end groove 4, after whereby conductors 11 are screwed into the holes 10 of the bracket 8. Then, through holes 15 in the bones 13 are drilled through the guide holes 12 in the conductors 11 to the intermediate channel 14 so that the longitudinal axes of the holes 15 coincide with the longitudinal axes of the holes 7 hydrochloric portion 5. Thereafter recovered L-shaped bracket and a corresponding pair of apertures 15 and 7 screwed fixing bolts 16.

The conductor (guide) is attached from the outside to the prosthesis and is designed for targeted insertion of screws (blocking the prosthesis into the bone) through the through holes of the inner leg of the prosthesis with a diameter of 1.5 mm.

The intraosseous threaded component is screwed into the bone, it has at least two through holes for screws, for example, with a diameter of 1.5 mm, to secure the prosthesis leg (inner part) to the bone providing high stability. After implantation of the inner part of the prosthesis into the bone, a special conductor is attached to the outer part of the part with the help of which the “blocking” of the inner leg in the bone is performed. The outer part of the prosthesis protrudes percutaneously outward.

Then perform the closure of the wound tissue 17.

In Fig.7-Fig.8 shows examples of installed titanium prostheses (x-ray and photo of the prosthesis on the limbs of the animal).

Thus, immediately after the operation, the prosthesis is securely fixed in the intermediate canal 14 of the bone 13, which allows the exosthesis of the supporting limb to be installed on the tail part 3 and the support ability of the damaged limb can be restored, thereby achieving the claimed technical result of the invention.

Perforation 2 of the flange 1 ensures the supply of tissue 17 with blood and nutrients and ensures its rapid healing, in addition, the chamfer from the tail portion 3 on the flange 1 prevents further possible damage to the fabric 17.

Claims (5)

1. Osteo-integrated prosthesis for implantation into the bone of a stump of an animal’s limbs, characterized in that it is made in the form of a cylindrical part with a perforated flange in the middle part, which has an introduction part for screwing into the intramedullary canal and a tail part for installing an exoprosthesis of the supporting limb, the introduction part has thread and transverse through holes with internal thread for insertion of fixing bolts; a groove for the socket wrench or spike of the guide for introducing fixing bolts is made at the end of the tail end in, while the said groove is oriented along the introductory part. 2. The prosthesis according to claim 1, characterized in that a rounded chamfer is made on the flange from the side of the tail. 3. The prosthesis according to claim 1, characterized in that an external thread is made on the opening of the prosthesis. 4. The prosthesis according to claim 1, characterized in that the prosthesis is made of a titanium alloy Ti-6Al-4V. 5. The prosthesis according to claim 1, characterized in that the prosthesis is made by 3D printing, selective laser melting of a titanium alloy Ti-6Al-4V.

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