RU2311886C1 - Rod apparatus for carrying out transosseous osteosynthesis - Google Patents

Abstract

FIELD: medical engineering.

SUBSTANCE: device has perforated arches connected to each other with threaded rods, reposition members manufactured as brackets having transosseous rods and attached to the arches, and reposition units. Each reposition unit has threaded rod, union member with ball having through hole for receiving transosseous rod, and nuts for moving and fixing union member on threaded rod, the rod being attached to the arch by means of brackets. The union member has casing, pressure strip, and two fastening screws. Hemispheric recesses are available in the casing and pressure strip for receiving balls. The transosseous rods are rotatable and axially movable and mounted in ball.

EFFECT: reduced risk of traumatic complications; enhanced effectiveness of treatment.

2 dwg

Description

The invention relates to medicine, is used in traumatology orthopedics for transosseous osteosynthesis of long tubular bones.

There are various devices used for this purpose, in particular, the device most widely used abroad [1] for transosseous osteosynthesis. However, it has the following disadvantages: when the support pins are inserted into the bone fragments, the pins must be installed strictly parallel to each other with certain distances in terms of clamp size. In this case, technical difficulties arise associated with the installation of the apparatus, and the duration of the operation is extended.

The rod analogue of transosseous osteosynthesis of VVFurdyuk can serve as another analogue [2]. The disadvantages of this apparatus are the design complexity, as a result of which there are difficulties in combining the threaded bushings of the fixation and reposition units located on the same axis on opposite sides of the apparatus.

The apparatus of V.V. Furdyuk [3] is known for transosseous osteosynthesis of long tubular bones, which includes an elongated frame with slots, on the parallel walls of which there are reposition and fixation nodes. In this case, the reposition units are made in the form of sliders with spacer threaded bushings and displacement nuts on the bodies of the sliders. Also, the disadvantage of this device is the technical complexity of the design that occurs when installing the device.

Closest in technical solution to the claimed one is the prototype Volkov-Hovhannisyan compression and distraction apparatus [4] that we adopted for the reduction and osteosynthesis of long tubular bones. The apparatus includes brackets mounted on supporting bolts and connected by two side distractors and with special fixators. However, despite the advantage of this device compared to the above counterparts, it, in turn, also has a number of disadvantages. The device is bulky, which causes significant inconvenience to the patient. In addition, the operation is quite laborious, since the side distractors of the prototype apparatus are used during the operation only as reponators. The final fixation is carried out by connecting the brackets with threaded bolts, after which the side distractors are removed.

The essence of the invention lies in the combination of essential features sufficient to achieve the desired technical result, namely, to reduce the invasiveness of the operation, its simplification, improve the repositional qualities of the apparatus, providing increased efficiency of surgical treatment.

This essence lies in the fact that the apparatus is equipped with reponentive nodes, each made in the form of threaded rods with a sleeve with a ball having a through hole for the transosseous rod, and a pressure bar. A ball with a transosseous rod in the coupling has the ability to be fixed in the deflection position in the range from 1 to 35 ° in all directions from the central axis of the coupling body, in cases where the transosseous rod is drawn with a small angle of deviation from the central axis of the coupling. In the holes of the ball are installed with the possibility of rotational and axial movements and fixing transosseous rods, and the threaded ends of the reponentive nodes are placed in the holes of the brackets located on the inner surfaces of the arcs of the apparatus, and are fixed with nuts.

The adjustable arrangement of threaded rods with a sleeve with a ball passing through their channels of transosseous rods provide, after preliminary elimination of rotational displacements, absolutely accurate reposition of bone fragments in these planes.

Figure 1 and figure 2 shows the apparatus for transosseous osteosynthesis with a reposition unit.

The rod apparatus for transosseous osteosynthesis contains arcs 1 with holes interconnected by threaded rods 2. On brackets 3 mounted on the outer surfaces of the arcs 1 transosseous rods are placed 4. On the inner surfaces of the arcs 1 on the brackets 5 are installed reponentive nodes 6. Reponent elements, made in the form of brackets fixed on arcs and equipped with transosseous rods, are installed with the possibility of movement and fixation by nuts. The threaded ends of the reparation units 6 are placed in the holes of the brackets 5 and are fixed with nuts 7. The reparation unit 6 consists of a sleeve 9 with a ball 8 and a threaded rod 16 with nuts 7 fixed to the arcs 1 with holes using brackets 5. The sleeve 9 consists of a housing 13 , a clamping bar 11, two clamping screws 12 and a metal ball 8 with an opening for transosseous rod 10. In the housing of the coupling 13 and the pressure bar 11 there are recesses 15 hemispherical shape for a ball with transosseous rod, which are fixed with clamping screws. The ball 8 with the transosseous rod in the coupling has the ability to be fixed in the deflection position within 1 to 35 ° from the central axis of the coupling body, which allows the transosseous rod held in the bone to be fixed in the position of deviation from the longitudinal axis of the bone at the required angle. The coupling is fixed to the arc using brackets and a threaded rod held through the through hole 14 of the coupling housing. The reponenting elements, made in the form of brackets fixed on arcs and equipped with transosseous rods, are installed in the balls of the coupling with the possibility of movement and fixing by nuts on the threaded rod. The threaded ends of the reponent nodes 6 are placed in the holes of the brackets 5 and fixed by nuts 7. In the holes of the ball 8, the couplings 9 of the reponent nodes 6 are mounted with the possibility of movement and fixation of transosseous rods 10. The working parts of transosseous rods in figure 1 are immersed in bone imitations.

The apparatus is used as follows: after eliminating the rotational displacement of the fragments, the trocar is inserted to the bone through micro-incision, the stylet is removed, a channel is drilled through the tube to insert the transosseous rod 4 through both cortical layers. The transosseous rod 4 is fixed to the arch 1 using the bracket 3. Similarly, the transosseous rod 4 is mounted on another bone fragment. A second pair of transosseous rods 10 are inserted closer to the fracture line. They are mounted reponentia nodes 6, donning them with holes located in the balls 8 of the sleeve 9, and fixed at the required angle by nuts 7 and the pressure plate 11 using the clamping screws 12. The reponent nodes 6 by means of brackets 5 are fixed to the inner surface of the arcs 1. Arc 1 interconnected by means of threaded rods 2. Under X-ray control, reposition is carried out by moving the elements of the reparation units 6 with nuts 7, i.e. couplings with a ball and transosseous rod 10 along the threaded rod 16 and transosseous rods 10.

When the bone fragments are correctly positioned, they are brought closer to the compression by means of threaded rods 2 connecting arcs 1. To stabilize the achieved reposition, an additional transosseous rod is introduced into each fragment at an angle of 60 ° to its axis, and transosseous rods 4 are fixed to the arches using brackets 3 along the outer surface of the arcs 1.

Information sources

1. Swiss patent No. 0684928, cl A1B 17/60 1995.

2. Furdyuk V.V. A.C. No. 1766390, A61B 17/60, 1993.

3. Furdyuk VV RU 2152190 C1, A61B 17/66, 09/23/1998.

4. Tkachenko S.S. "Osteosynthesis." L .: Medicine, 1987, p.122-123.

Claims (1)

A rod apparatus for transosseous osteosynthesis containing arcs with holes interconnected by threaded rods, reponenting elements in the form of brackets equipped with transosseous rods and fixed on arcs, and reponent nodes, characterized in that each reponent node is made in the form of a threaded rod, couplings with a ball having a through hole for the transosseous rod, and nuts for moving and fixing the coupling on the threaded rod, the latter being fixed to the arc using brackets, the coupling consists of the housing, the clamping plate and two clamping screws, the hemispherical notches for the ball are made in the body and the clamping plate, transosseous rods are installed in the ball with the possibility of rotational and axial movements and fixing.

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