RU2699970C1 - Method of increasing rigidity of fixation of joints in devices for transosseous osteosynthesis and a junction assembly - Google Patents

Method of increasing rigidity of fixation of joints in devices for transosseous osteosynthesis and a junction assembly Download PDF

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RU2699970C1
RU2699970C1 RU2018136809A RU2018136809A RU2699970C1 RU 2699970 C1 RU2699970 C1 RU 2699970C1 RU 2018136809 A RU2018136809 A RU 2018136809A RU 2018136809 A RU2018136809 A RU 2018136809A RU 2699970 C1 RU2699970 C1 RU 2699970C1
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rods
fixation
transosseous
white
grain size
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RU2018136809A
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Russian (ru)
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Игорь Георгиевич Киселев
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Игорь Георгиевич Киселев
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Abstract

FIELD: medicine.SUBSTANCE: group of inventions relates to medicine. Method of increasing rigidity of fixation of joints in devices for transosseous osteosynthesis envisages surface treatment with a sandblast device using an abrasive. Treatment is carried out with white electrocore of grade 25A of ring, semi-rings, radial and straight plates, spokes and rods, finger fixators and connecting monoblocks, washers, as well as threads of bolts and nuts. Spokes and rods, as well as threads of bolts and nuts are treated with abrasive with grain size F150. Remaining parts are processed in two stages: I is coarse treatment of parts surfaces with white electrocore of grade 25A with grain size F22; II – processing with white crystalline corundum grade 25A with grain size F54. Parts of the hardware structure are connected through a profile washer, in which two diametrically opposite ends are in different planes. Joint unit for use in transosseous osteosynthesis devices consists of threaded rods of a transosseous fixation device and a connecting block comprising two mutually perpendicular through holes at a distance from each other. Two four-sided blocks are connected by laying between them a profile washer, in which two diametrically opposite ends are in different planes. One of every pair of holes is threaded.EFFECT: invention provides reducing labor intensity of osteosynthesis, reducing traumatism due to increased stability of compounds and achieving conditions sufficient for early recovery of injured extremity.2 cl, 4 dwg

Description

The invention relates to medicine, namely to traumatology and orthopedics, and is intended for the treatment of fractures using hardware structures for transosseous osteosynthesis.

In the practice of treating bone fractures, the method of external transosseous osteosynthesis has spread, which is implemented using external fixation devices for bone fragments in a given mutual position. The effectiveness of the use of such devices is to a large extent determined by the elements of the connection of external supports with immersion elements, i.e. connecting nodes. Fixation of bone fragments should be simple, less traumatic and rational in duration. The connecting nodes of the apparatus must provide a rigid connection of the immersive transosseous elements with the supporting support of the external structure.

Known compression-distraction apparatus [1], which contains connected distraction rods supports in the form of rings with holes and mounted on them spoke holders with knitting needles. The disadvantages of the known design include the complexity of the overlay, which requires special qualifications of the doctor, and the disadvantage of the treatment method is the unsatisfactory effectiveness of the treatment of patients caused by insufficient rigidity of osteosynthesis.

A device for osteosynthesis (Pat. 2283630, RF, IPC АВВ 17/68, 2001), which is used in combination with external fixators and intervertebral implants, is known. The device consists of a bone plate with a through hole for the sleeve, which has a central channel for insertion of the bone screw. The through hole has a polygonal, preferably hexagonal shape, and the central channel has a conical shape with an internal screw thread. The task of improving the adhesion between the sleeve and the bone plate is solved by sandblasting the surface of the sleeve and through holes, which are made rough. The device is effective for solving the problem of fixing bone screws in a stable state at an angle relative to the bone plate. The disadvantage is the technological complexity of manufacturing the elements of the device.

The closest in technical solution is the Method of increasing the stability of the pin during restoration of the tooth crown (US Pat. 2397733, RF, IPC АСС 13/23, 2006), which is used in dentistry to restore completely damaged tooth crowns. The method includes processing the root part of the tooth crown pin with a sandblasting device for ten seconds at a particle size of 100-120 microns. Sandblasting creates an effective adhesive surface in the form of the formed roughness and achieve reliable fixation of the pin in the root canal of the tooth. The disadvantage of this method is that the technology is designed to solve the problems of dentistry.

Closest to the claimed connection node is the connection node presented in the Combination device of transosseous fixation of the rod type for the treatment of bone fractures (Pat. 255123, RF, IPC АВВ 17/66, 2014), which allows fixing the joint and two adjacent segments. The connecting unit consists of a threaded rod of the transosseous fixation device and a flat slide used as a connecting unit, on which two mutually perpendicular through holes are made at a certain distance relative to each other. The slider is mounted on the threaded rod and fixed with a nut. The diameters of the holes in the sliders are made in accordance with the diameters of the threaded rods and the diameter of the transosseous elements. The diameters of the threaded rods used are in the range of 6-12 mm. The disadvantages of the connection node include insufficient rigidity of fixation of bone fragments, excessive dimensions of the connecting block (slider) and its insufficient functionality.

The objective of the invention is to develop a technology to increase the rigidity of fixation of the joints in the transosseous osteosynthesis apparatus as a whole, the formation of articulated joints, providing a rigid fixation of transosseous structural elements and providing a rigid landing rods and knitting needles in the bone.

The technical result from the implementation of the invention consists in reducing the complexity of osteosynthesis, reducing trauma due to increased stability of the compounds, achieving sufficient conditions for early restoration of the function of the damaged limb. The technical result should include the fact that the method provides the ability to reduce the weight of structures through the use of parts of a smaller size. In addition, sandblasting of knitting needles and rods contributes to additional osseointegration of temporary implants placed in the bone.

The task is achieved as follows. A method of increasing the rigidity of fixation of joints in transosseous osteosynthesis apparatus involves surface treatment with a sandblasting device using an abrasive to form a rough surface. At the same time, rings, half rings, radius and straight plates, knitting needles and rods, finger spoke fixators and connecting monoblocks, washers, and also threads of bolts and nuts are treated with white aluminum oxide of grade 25A. Spokes and rods, as well as threads of bolts and nuts, are treated with F150 grit, and the remaining parts of the hardware structures are processed in two stages: I - rough surface treatment of parts with white alumina grade 25A with grit F22; II - treatment with white electrocorundum grade 25A grain size F54. In addition, the details of the hardware design are connected through a profile washer, in which two diametrically opposite ends are in different planes.

To accomplish this task, a joint assembly has been developed for use in transosseous osteosynthesis apparatus, which contains threaded rods of the transosseous fixation apparatus and a connecting block with two mutually perpendicular through holes made at a distance relative to each other, and one of the pair of holes is threaded. In the connection node, two tetrahedral blocks are connected by laying a profile washer between them, in which two diametrically opposite ends are in different planes.

The claimed technical result is achieved as follows.

Changing the surface geometry of metal parts and creating microroughnesses after sandblasting improves the adhesion of parts of hardware structures and increases the rigidity of their fixation.

Sandblasting with white electrocorundum grade 25A with low abrasive grit values allows you to create a rough surface on the threaded areas without destroying the thread. Sandblasting with white electrocorundum of grade 25A with different abrasive grit values provides a “rough” rough surface, but smaller abrasive particles provide roughness in the irregularities formed after the first stage, and additionally create a profile or a notch in them. The choice of the type of abrasive and the size of the grit are performed by the author experimentally to achieve the claimed result.

Sandblasting improves fixation properties in threaded joints and is a renewable treatment without the use of additional consumables.

The connection of parts of the hardware design through a profile washer, in which two diametrically opposite ends are in different planes, eliminates the displacement and scrolling of the washer during installation, increases the degree of compaction of the connection and increases the stability and rigidity of fixation of the connecting nodes.

The use of the connecting node can reduce the complexity and duration of the operation and increase the rigidity of fixation and stabilization of fragments.

The patent studies on subclasses of IPC АВВ 17/58, 5/11, 5/00, 5/02, 19/00, as well as the analysis of scientific and technical sources related to technologies for achieving stiff fixation of bone fragments during transosseous osteosynthesis, did not reveal technical solutions identical to the claimed invention, and this allows us to conclude about the novelty.

The implementation of the essential methods of the proposed method and device ensures the achievement of a solution to the problem, namely: creating conditions for rigid fixation of bone fragments and achieving stability of the hardware system in the treatment of patients under conditions of transosseous osteosynthesis. Thus, the proposed technical solution has an inventive step. The proposed method and node connections are applicable in the field of practical medicine.

A method of increasing the rigidity of fixation of the nodes of the connection in the transosseous osteosynthesis apparatus, including surface treatment with a sandblasting device, is implemented as follows. The surfaces of rings, half rings, radial and straight plates having holes for mounting parts of hardware structures of external osteosynthesis, spokes and rods, finger special fixators and connecting monoblocks, washers, as well as threads of bolts and nuts, and other fasteners are subjected to sandblasting. For processing, white electrocorundum of grade 25A is used [2]. Rods and knitting needles, as well as threads of bolts and nuts, are treated with white electrocorundum of grade 25A with a grain size of F150 (particle size 0.063-0.150). The remaining metal parts used in external fixation devices are processed in two stages:

I - rough surface treatment of parts with white alumina grade 25A grain size F22 (particle size 0.71-1.40 mm);

II - treatment with white electrocorundum of grade 25A with a grain size of F54 (particle size 0.2-0.5 mm), when smaller particles of abrasive roughen the irregularities formed after the first stage and additionally create a profile or notch in them.

Sandblasting air-abrasive treatment to create a rough surface is carried out by a sandblasting apparatus for 10-30 seconds.

The inventive device is illustrated by illustrations. In FIG. 1 - connection node; FIG. 2 - profile washer; FIG. 3 - connecting block; FIG. 4 - a fragment of the design.

The connection node in the transosseous osteosynthesis apparatus (Fig. 1) consists of two connecting blocks 1 and a profile washer 2 (Fig. 2) located between the blocks 1. Profile washer 2 seals the connection due to the fact that its two diametrically opposite ends are in different planes . Each block 1 (Fig. 3) consists of a body in the form of an elongated tetrahedral prism with an axial through threaded hole 3. Through holes perpendicular to the axis of block 1 are made through holes 4, 5 spaced along the length of the block, one of which is threaded 4 and the other is threaded 5. Install the rods 6 in the threaded holes of the blocks (Fig. 1) and fix the assembly in the set position with the threaded rod and nut 7. All elements of the connection assembly (blocks 1, washer 2, fasteners) have a rough surface after sandblasting, therefore, when profile washer Naya contacts the urging member, its shape in combination with the roughened surface provides a strong bond during installation site, eliminate sliding, increases the rigidity and stability of the fixation. In FIG. Figure 4 shows an example of a design where smooth rods of a hardware structure are installed in the threadless holes of the block (Fig. 4).

Experimental studies of the proposed method and device were performed on 16 large dogs of various breeds (weighing more than 25 kg), having spontaneous fractures of the bones of the distal limbs (bones of the forearm and lower leg), as well as dislocations of the elbow and hock (tarsal) joints. The external fixation devices used in the study (arc-ring type) in all cases had from 2 to 6 hinge nodes made on the basis of the proposed connection nodes, including 2 connecting blocks connected to each other through a profile washer, and also had a constructive fasteners to rings and radius plates with nuts and bolts. When assembling the apparatuses on the bones, rods and spokes processed according to the proposed method were used. All animals went through a recovery period (healing of fractures and stabilization of joints after dislocations) under conditions uncontrolled by loads: without limitation of mobility, starting from the first hours after surgery until the apparatus is dismantled. The criteria for assessing the stored rigidity of the devices were considered the absence of loosening in the attachment points in the hardware structures. Criteria for the stability of the rods and spokes were considered their residual strength backlog in the bone after dismantling of structures. As a result, loosening was not observed in all connecting nodes of the apparatus during all surgical interventions. All nut-bolt joints were in a state of initial stability. The spoke and rod mounts to the devices were also stable. In the knots "knitting-bone", "rod-bone" in 2 cases, loosening of the rods was observed, in 4 cases, loosening of the needles was observed.

Sources of information taken into account:

1. A set of nodes and parts of apparatus for osteosynthesis of the femur bones (according to the method of G. A. Ilizarov), code 01.01.040. State experimental enterprise "CITO".

2.Http: //www.teh-stroy.ru/st_elektrokomnda-vidy-modifikatsii-oksida-alyuminiya-al2o3-abrazivnogo-korunda.php - 10.29.2018

Claims (2)

1. A method of increasing the rigidity of fixation of the joints in transosseous osteosynthesis apparatus, which involves surface treatment with a sandblasting device using an abrasive, characterized in that the rings, half rings, radius and straight plates, knitting needles and rods, finger specificators and connecting monoblocks are treated with white electrocorundum mark 25A washers, as well as threads of bolts and nuts, moreover, for knitting needles and rods, as well as for threading bolts and nuts, an abrasive of grain size F150 is used, and the remaining parts are processed in two stage: I - rough machining surfaces of parts electrocorundum white marks 25A grit F22; II - treatment with white electrocorundum grade 25A grain size F54; in addition, the details of the hardware design are connected through a profile washer, in which two diametrically opposite ends are in different planes.
2. The connection node for use in transosseous osteosynthesis apparatus, consisting of threaded rods of the transosseous fixation apparatus and the connecting block, which contains two mutually perpendicular through holes at a distance relative to each other, characterized in that the two tetrahedral blocks are connected by laying a profile washer between them, in which two diametrically opposite ends are in different planes, and for each block of a pair of holes, one is threaded.
RU2018136809A 2018-10-18 2018-10-18 Method of increasing rigidity of fixation of joints in devices for transosseous osteosynthesis and a junction assembly RU2699970C1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2687720A (en) * 1950-08-29 1954-08-31 Edward J Haboush Ambulatory splint and traction device
WO2001056486A1 (en) * 2000-02-02 2001-08-09 Immedica Adjustable bone stabilizing frame system
RU21736U1 (en) * 2001-05-17 2002-02-20 Оганесян Оганес Вартанович Apparatus for reduction and fixation of bone fragments and the articular ends
RU2311886C1 (en) * 2006-04-28 2007-12-10 Джевдет Энвербекович Купкенов Rod apparatus for carrying out transosseous osteosynthesis
RU2363407C1 (en) * 2007-12-29 2009-08-10 Джевдет Энвербекович Купкенов Method of repositioning and osteosynthesis of segmental fracture of humerus using rod-shaped device for transosseous osteosynthesis
RU2555123C1 (en) * 2014-01-24 2015-07-10 Алексей Владимирович Салаев Transosseous fixation rod-type combination apparatus for treating bone fractures
US9545266B2 (en) * 2005-06-21 2017-01-17 DePuy Synthes Products, Inc. Adjustable fixation clamp and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2687720A (en) * 1950-08-29 1954-08-31 Edward J Haboush Ambulatory splint and traction device
WO2001056486A1 (en) * 2000-02-02 2001-08-09 Immedica Adjustable bone stabilizing frame system
RU21736U1 (en) * 2001-05-17 2002-02-20 Оганесян Оганес Вартанович Apparatus for reduction and fixation of bone fragments and the articular ends
US9545266B2 (en) * 2005-06-21 2017-01-17 DePuy Synthes Products, Inc. Adjustable fixation clamp and method
RU2311886C1 (en) * 2006-04-28 2007-12-10 Джевдет Энвербекович Купкенов Rod apparatus for carrying out transosseous osteosynthesis
RU2363407C1 (en) * 2007-12-29 2009-08-10 Джевдет Энвербекович Купкенов Method of repositioning and osteosynthesis of segmental fracture of humerus using rod-shaped device for transosseous osteosynthesis
RU2555123C1 (en) * 2014-01-24 2015-07-10 Алексей Владимирович Салаев Transosseous fixation rod-type combination apparatus for treating bone fractures

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