RU42167U1 - TAPE BONE FRACTURE FIXER FOR SCAN AND SCREWS IN DOGS AND CATS - Google Patents

Abstract

The utility model relates to veterinary surgery, namely, osteosynthesis of tubular bones in dogs and cats. Most effective is its use in osteosynthesis of tubular bones with oblique and helical fractures. The objective of the proposed solution is to reduce trauma to bones, eliminate the possibility of divergence of fragments, increase the effectiveness of the treatment by maintaining blood circulation of the periosteum between the bone distal and proximal to the contracting strip, which in turn reduces bone repair time, reduces the cost of medication, reduces the drug load on the body during the period of bone tissue repair, and also reduces the possibility of developing osteomyelitis. The task is achieved due to the fact that the known retainer in the form of a tightening strip, which according to the invention is made with a groove on the one hand, and on the other hand with transverse semi-oval protrusions located at a distance of 5.0 mm from each other. The proposed utility model allows to prevent the discrepancy of fragments after their fixation, enhance biological functions in bone tissue, reduce bone injury, increase the effectiveness of the treatment, maintain blood circulation in the periosteum between the sections of bone located distal and proximal to the contracting bands, reduce bone repair time, reduce the cost of medications, reduce the drug load on the body during bone tissue repair, reduce the likelihood of developing osteomyelitis. This greatly improves the efficiency of the operation.

Description

The utility model relates to veterinary surgery, namely, osteosynthesis of tubular bones in dogs and cats. Most effective is its use in osteosynthesis of tubular bones with oblique and helical fractures.

Known contracting strip in combination with a rod during intramedullary osteosynthesis of tubular bones with oblique fractures (1).

Also known is a retainer-coupler, consisting of longitudinal plates, cerclage ribbons and loops (2).

The main disadvantage with longitudinal, oblique and helical fractures of the above fixators is the possibility of violation of the trophism of the periosteum. This type of postoperative complication is due to the fact that the contracting strip, wire and retainer-screed along their entire length is in contact with bone tissue, exerting pressure on the blood vessels of the periosteum. As a result of this, the circulation of the periosteum between the bone sections located distal and proximal to these fixatives is limited, or even completely disturbed. A decrease in bone trophism in a certain area of the bone leads to an increase in the duration of bone callus formation. As practice has shown, even with an insignificant load of the animal on the injured limb, the tightening strips and the retainer-screed often do not perform a fixing function. This leads to a divergence of fragments, a violation of the formation of bone callus by primary intention, lengthening the repair period and, in the majority, to the configuration of the bone after fusion of the fragments or to pseudoarthrosis. The fixing ability of the wire is much higher, but in some cases it must be applied to the damaged bone in two or more turns.

The objective of the proposed solution is to reduce trauma to bones, eliminate the possibility of divergence of fragments, increase the effectiveness of the treatment by maintaining blood circulation of the periosteum between the bone distal and proximal to the contracting strip, which in turn reduces bone repair time, reduces the cost of medication, reduces the drug load on the body during the period of bone tissue repair, and also reduces the possibility of developing osteomyelitis.

The task is achieved due to the fact that the known retainer in the form of a tightening strip, which according to the invention is made with a groove on the one hand, and on the other hand with transverse semi-oval protrusions located at a distance of 5.0 mm from each other.

The technical essence of the proposed latch is presented in the drawings, where:

in figure 1. - a tightening strip is presented (general view);

figure 2. - cross section aa in figure 1;

figure 3. - fixation of fragments of the tubular bone during an oblique fracture with a rod and a contracting strip reinforced with a wire (side view);

figure 4. - transverse section of the tubular bone.

The pulling strip 1 has transverse semi-oval protrusions 2 on one side for resting on a bone and a groove 3 for laying wire 4 on the other side. Fixation of bone fragments along their length is carried out using a rod 5 inserted into the bone marrow canal of the bone 6 through an artificial hole 7. The fragments along the fracture line 8 are prevented from diverging, and circulation in the blood vessels of the periosteum 9. The bone tissue of the bone diaphysis 10 is dented on the periosteum 11.

The use of strip 1 is described by the example of osteosynthesis of a dog's tibia and is carried out as follows:

After combining the fragments in the first stage, the rod 5 is inserted according to generally accepted methods of osteosynthesis into the medullary canal of the bone 6 through an artificial opening 7 in the proximal pineal gland.

At the second stage of osteosynthesis, in order to prevent the fragments from breaking along the fracture line 8 and relative to the longitudinal axis of the bone, tightening strips 1 are fixed in two places, fixed by wire 4. Due to the proposed design of tightening strips 1, more reliable fixation of bone fragments is noted.

Due to the protrusions 2, the contracting strips 1 are in contact with the bone tissue at regular intervals (5.0 mm), and in areas where the contracting strips 1 do not come in contact with the bone, circulation in the blood vessels of the periosteum 9 between the bone parts located distal and proximal tightening strips 1.

On the transverse section of the tubular bone are reflected: the rod 5, the bone marrow canal of the bone 6, the bone tissue of the diaphysis of the bone 10, the contracting strip 1, fixed by a wire 4 and dents on the periosteum 11. The modified contracting strip 1 is fixed motionlessly by the protrusions 2 in the dents 4 formed when the wire is tightened, periosteum 11. This eliminates its displacement down, up on the surface of the bone, as well as its rotation around the diaphysis of the bone.

The application of the proposed utility model provides the following advantages:

- prevention of discrepancy of fragments after their fixation;

- enhancement of biological functions in bone tissue;

- reduction of bone injury;

- increasing the effectiveness of the treatment;

- preservation of blood circulation in the periosteum between areas of the bone located distal and proximal to the constricting bands;

- reduction of bone repair time;

- reduction of drug costs;

- a decrease in the drug load on the body during bone repair;

- reducing the likelihood of developing osteomyelitis;

This significantly increases the efficiency of the operation (see table).

Table. Tightening strip The number of operated
animals Complete restoration of support function (24 hours) Proposed 7 26-27 Famous 6 31-32

As can be seen from the table, the application of the proposed utility model is more effective than the known one and allows to accelerate the full restoration of support function in animals 5-6 days earlier than when using the generally accepted contracting band.

The proposed utility model was successfully applied in the treatment of 5 dogs and 2 cats with fractures of long tubular bones on the basis of the medical and diagnostic veterinary center Orel GAU.

Sources of information used during the examination:

1. Nikitin G. D., Mityunin N. K., Gryaznukhin E. G. Multiple and combined bone fractures. - Leningrad. "MEDICINE", Leningrad branch, 1976, p. 97, fig. 36 (h) - prototype.

2. Anischenko S.M., Oleksyuk D.I. Clamp - screed for metal osteosynthesis of oblique, spiral and multi-fragmented fractures // Bulletin of Surgery named after I.I. Grekov. - L .: “Medicine”, Leningrad Branch, No. 4, volume 1121974, p.111-114.

Claims (1)

Fixator of fragments of tubular bones in oblique and helical fractures in dogs and cats in the form of a constricting strip, characterized in that the constricting strip is made with a groove on one side and, on the other hand, with transverse semi-oval protrusions located at a distance of 5.0 mm from each other friend.